GB 50150-1991 Electrical equipment acceptance test standard for electrical installation engineering
Some standard content:
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
GB50150—91
Electrical Equipment Installation Engineering
Standard for Hand-over Test of Electric Equipmentelectric Equipment Installation EngineeringBuilding Standard
1991-11-15Release
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
1992-07-01
Jointly Issued
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Electrical Equipment Installation Engineering
Standard for Hand-over Test of Electric Equipment
GB50150—91
Editor Department: Ministry of Energy of the People's Republic of ChinaApproval Department ：Ministry of Construction of the People's Republic of China Date of implementation: July 1, 1992
Full text information system of engineering construction standards
Full text information system of engineering construction standards
Notice on the release of the national standard "Standard for acceptance test of electrical equipment for electrical installation engineering" Construction Standard [1991] No. 818
According to the requirements of the State Planning Commission's document [1986] No. 2630, the "Standard for acceptance test of electrical equipment for electrical installation engineering" organized and revised by the former Ministry of Water Resources and Electric Power has been reviewed by relevant departments and is now approved as a national standard. The number is GB5015091 and it will be implemented from July 1, 1992.
The electrical equipment acceptance test standard in the former national standard "Construction and Acceptance Specifications for Electrical Installation Engineering" GBJ232-82 is abolished at the same time. This standard is managed by the Ministry of Energy. The Ministry of Energy's Electric Power Construction Research Institute is responsible for specific interpretations and other work. The publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
November 15, 1991
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Revision
This standard is edited by the former Ministry of Water Resources and Electric Power in accordance with the requirements of the State Planning Commission's Document No. 2630 [1986], and is specifically compiled by the Ministry of Energy's Electric Power Construction Research Institute in conjunction with relevant units.
During the revision process, the drafting group of this standard conducted extensive investigations and studies, carefully summarized the experience since the implementation of the original standard, absorbed some scientific research results, and widely solicited opinions from relevant units across the country. Finally, our ministry and relevant departments reviewed and finalized the draft. This standard is divided into 26 chapters and four appendices. The main contents of this revision are: the scope of application of this standard is 500kV and below newly installed electrical equipment; the acceptance test items and standards of 500kV voltage level electrical equipment are supplemented, and new chapters such as "vacuum circuit breakers, sulfur hexafluoride circuit breakers, sulfur hexafluoride enclosed combination electrical appliances, electric precipitators and low-voltage electrical appliances" are added; new test technologies and test standards such as "partial discharge test, chromatographic analysis, measurement of trace water content, measurement of gas content, measurement of noise and measurement of temperature distribution" are adopted.
In the process of implementing this standard, if any imperfections are found, please send your opinions and relevant materials to the Standard and Quota Office of the Electric Power Construction Research Institute of the Ministry of Energy in Liangxiang, Beijing (Postal Code: 102401) for reference in future revisions. Ministry of Energy
October 16, 1990
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Synchronous Generators and Phase Shifters
DC Motors
Medium Frequency Generators
AC Motors
Power Transformers
Reactors and Arc Suppression Coils
Oil Circuit Breakers
Air and Magnetic Blowouts Circuit Breakers
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
Chapter 19
Chapter 20
Vacuum Circuit Breakers
Sulfur Hexafluoride Circuit Breakers
Sulfur Hexafluoride Enclosed Combined Electrical Appliances
Disconnectors, Load Switches and High-Voltage Fuse Sets
Suspension Insulators and Post Insulators
Chapter 21
Chapter 22
Chapter 23
Chapter 24
Chapter 25||t t||dust collector·
secondary circuit
1kV and below distribution equipment and feeder lines
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（37)
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（67)
.Above overhead power lines.6
grounding device
engineering construction standard full text information system
：（69)
engineering construction standard full text information system
Chapter 26 Low voltage electricity
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Appendix 1 Power frequency withstand voltage test voltage standard for insulation of high-voltage electrical equipment
Conversion coefficient of insulation resistance value of motor stator winding to operating temperature
Appendix 2
Appendix 4
Reference value of leakage current of oil-immersed power transformer winding Explanation of terms used in this standard
Additional explanation
Engineering construction standard full text information system
Engineering construction standard full text information system
Chapter 1 General Provisions
Article 1.0.1 This standard is specially formulated to meet the needs of acceptance test of electrical equipment in electrical installation engineering and promote the promotion and application of new technologies for acceptance test of electrical equipment.
Article 1.0.2 This standard applies to acceptance test of newly installed electrical equipment of 500kV and below. This standard does not apply to electrical equipment installed in coal mines or other places with explosion hazards.
Article 1.0.3 The acceptance test of relay protection, automatic, telecontrol, communication, measurement, rectifier and mechanical parts of electrical equipment shall be carried out in accordance with the provisions of relevant standards or specifications.
Article 1.0.4 Electrical equipment shall be subjected to withstand voltage test in accordance with this standard, but for electrical equipment of 110kV and above, AC withstand voltage test may not be carried out when there is no provision in this standard.
The duration after the test standard voltage is applied during AC withstand voltage test shall be 1min unless otherwise specified.
When the withstand voltage test voltage value is calculated as a multiple of the rated voltage, the generator and motor shall be calculated according to the nameplate rated voltage, and the cable may be calculated according to the rated voltage of the cable. For electrical equipment of non-standard voltage level, the AC withstand voltage test voltage value may be calculated by the insertion method in proportion to the adjacent voltage level specified in this standard when there is no provision.
When conducting insulation test, except for the complete set of equipment assembled by the manufacturer, various equipment connected together should be separated and tested separately. Equipment with the same test standard can be tested together. To facilitate on-site testing, electrical equipment with the same voltage level but different test standards that have test records can also be tested together when it is difficult to test them separately. The test standard should adopt the lowest engineering construction standard full text information system
engineering construction standard full text information system
standard among the various connected equipment.
The insulation test of oil-immersed transformers, reactors and arc suppression coils should be left standing for a certain period of time after being filled with qualified oil and the bubbles are eliminated before it can be carried out. The standing time is based on product requirements. When the manufacturer has no regulations, the voltage level of 500kV must be left standing for more than 72h, 220-330kV must be left standing for more than 48h, and 110kV and below must be left standing for more than 24h.
Article 1.0.5 When measuring and testing electrical insulation, if only individual items fail to meet the requirements of this standard, a comprehensive judgment should be made based on the comprehensive test records. If it is considered that it can be put into operation after comprehensive judgment, it can be put into operation. Section 1.0.Article 6 When the rated voltage of electrical equipment is different from the rated working voltage actually used, the test voltage standard shall be determined according to the following provisions: 1. When using electrical equipment with a higher rated voltage to strengthen insulation, the test standard of the rated voltage of the equipment shall be followed; 2. When using electrical equipment with a higher voltage level to meet the requirements of product versatility and mechanical strength, the test standard of the rated working voltage actually used by the equipment can be followed;
3. When using electrical equipment with a higher voltage level to meet the requirements of high-altitude areas, the test standard of the rated working voltage actually used shall be followed at the installation site. Article 1.0.7 When conducting various tests related to temperature and humidity, the temperature of the test object and the surrounding temperature and humidity shall be measured at the same time. The insulation test shall be carried out under good weather conditions, and the temperature of the test object and the surrounding temperature of the instrument shall not be lower than 5°C, and the relative humidity of the air shall not be higher than 80%.
During the test, attention shall be paid to the influence of ambient temperature. For oil-immersed transformers, reactors and arc-extinguishing coils, the upper oil temperature of the transformer, reactor and arc-extinguishing coil shall be used as the test temperature.
The normal temperature used in this standard is 10-40℃; the operating temperature is 75℃. Article 1.0.8 The insulation resistance measurement listed in this standard shall use the insulation resistance value of 60s; the measurement of absorption ratio shall use the ratio of the insulation resistance value of 60s to 15s; the polarization index shall be the ratio of the insulation resistance value of 10min to 1min. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Article 1.0.9 When conducting insulation test on multi-winding equipment, the non-tested windings shall be short-circuited and grounded.
Article 1.0.10 When measuring insulation resistance, the voltage level of the megohmmeter shall be measured according to the following provisions unless otherwise specified in this standard: 1. For electrical equipment or circuits below 100V, a 250V megohmmeter shall be used; 2. For electrical equipment or circuits below 500V to 100V, a 500V megohmmeter shall be used. 3. For electrical equipment or circuits below 3000V to 500V, a 1000V megohmmeter shall be used; 4. For electrical equipment or circuits below 10000V to 3000V, a 2500V megohmmeter shall be used. 5. For electrical equipment or circuits above 10000V, a 2500V or 5000V megohmmeter shall be used.
Article 1.0.11
The high-voltage test method of this standard shall be carried out in accordance with the provisions of the current national standard "High Voltage Test Technology". Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Synchronous Generators and Phase Regulators
Article 2.0.1 The test items for synchronous generators and phase regulators with a capacity of 6000kW and above shall include the following:
1. Measure the insulation resistance and absorption ratio of the stator winding; 2. Measure the DC resistance of the stator winding; 2. DC withstand voltage test and leakage current measurement of the stator winding; 4. AC withstand voltage test of the stator winding;
5. Measure the insulation resistance of the rotor winding; 6. Measure the DC resistance of the rotor winding; 7. AC withstand voltage test of the rotor winding;
8. Measure the insulation resistance of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and the exciter armature; 9. The AC withstand voltage test of the excitation circuit of the generator or exciter together with the connected equipment Pressure test, excluding generator rotor and exciter armature, 10. Stator core test;
11. Measure the insulation resistance of the insulating bearings of the generator and exciter and the water inlet support of the rotor,
12. Measure the insulation resistance of the embedded thermometer and verify the temperature error; 13. Measure the DC resistance of the demagnetization resistor and the self-synchronous resistor; 14. Measure the ultra-transient reactance and negative sequence reactance; 15. Measure the AC impedance and power loss of the rotor winding, 16. Measure and record the three-phase short-circuit characteristic curve; 17. Measure and record the no-load characteristic curve;
18. Measure the demagnetization time constant when the generator stator is open-circuited, 19. Measure the stator residual voltage after the automatic demagnetization device of the generator is disconnected; Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Twenty. Measure the phase sequence,
Twenty-one. Measure the shaft voltage.
Note: ① Synchronous generators with a capacity of less than 6000kW and a voltage of more than 1kV shall be tested in all other items except item 14.
② Synchronous generators with a voltage of 1kV and below shall be tested in accordance with items 1, 2, 4, 5, 6, 7, 8, 9, 11, 12, 13, 20 and 21 of this article regardless of their capacity. ③ Synchronous phase regulators without starting motors or phase regulators whose starting motors are only allowed to run for a short time may not be tested in items 16 and 17 of this article. Article 2.0.2 The insulation resistance and absorption ratio of the stator winding shall be measured in accordance with the following provisions:
1. The unbalance coefficient of the insulation resistance of each phase shall not be greater than 2; 2. Absorption ratio: for asphalt impregnated and baked mica insulation, it shall not be less than 1.3; for epoxy powder mica insulation, it shall not be less than 1.6.
Note: ① Before conducting the AC withstand voltage test, the insulation of the motor winding shall meet the requirements of items 1 and 2. ② The water-cooled motor should be tested under the condition of eliminating the influence of residual water. ③ The motor that has passed the AC withstand voltage test can be put into operation without drying when its insulation resistance is close to the operating temperature and the epoxy powder mica insulated motor is not less than 1MQ per kilovolt of its rated voltage at room temperature. However, the end cover should not be removed for internal work before commissioning. ④ For water-cooled motors, the insulation resistance of the water collection pipe and the water diversion pipe should be measured. The resistance value should comply with the manufacturer's regulations.
Article 2.0.3 The measurement of the DC resistance of the stator winding shall comply with the following provisions: 1. The DC resistance shall be measured in a cold state, and the difference between the surface temperature of the winding and the ambient air temperature during measurement shall be within the range of ±3°C; 2. The DC resistance of each phase or each branch winding shall not exceed 2% of its minimum value after correcting the error caused by different lead lengths; compared with the value measured when the product leaves the factory and converted to the value at the same temperature, its relative change shall not be greater than 2%.
Article 2.0.4 The DC withstand voltage test and leakage current measurement of the stator winding shall comply with the following provisions:
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
1. The test voltage is 3 times the rated voltage of the motor. 3. The test voltage is increased in stages by 0.5 times the rated voltage per level, staying for 1 minute in each stage, and recording the leakage current; under the specified test voltage, the leakage current shall comply with the following provisions:
1. The difference in leakage current of each phase shall not be greater than 50% of the minimum value. When the maximum leakage current is below 20uA, the difference between each phase should not be significantly different from the factory test value.
2. The leakage current should not increase with time; when one of the above provisions is not met, the cause should be found and eliminated. 3. When the leakage current increases significantly and disproportionately with the voltage, it should be analyzed in time. 3. Hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. 4. When testing water-cooled motors, the low-voltage shielding method should be adopted. Article 2.0.5 The voltage used in the stator winding AC withstand voltage test shall comply with the provisions of Table 2.0.5. The insulation AC withstand voltage test of the stator winding of the hydro-turbine generator assembled on site during the process shall be carried out in accordance with the relevant provisions of the current national standard "Technical Specifications for Installation of Hydro-Turbine Generator Sets". Water-cooled motors are tested under water flow, and the water quality should be qualified; hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. Stator winding AC withstand voltage test voltage
Capacity (kw)
Below 10000
10000 and above
Note: Un is the rated voltage of the generator.
Rated voltage (V)
36 and above
3150~6300
6300 and above
Test voltage (V)
1.5Un+750
1.5Un+2250
Article 2.0.6 The insulation resistance of the rotor winding shall be measured in accordance with the following provisions:Article 7 When conducting various tests related to temperature and humidity, the temperature of the test object and the surrounding temperature and humidity should be measured at the same time. The insulation test should be carried out under good weather conditions, and the temperature of the test object and the surrounding temperature of the instrument should not be lower than 5°C, and the relative humidity of the air should not be higher than 80%.
During the test, attention should be paid to the influence of ambient temperature. For oil-immersed transformers, reactors and arc-extinguishing coils, the upper oil temperature of the transformer, reactor and arc-extinguishing coil should be used as the test temperature.
The normal temperature used in this standard is 10~40°C; the operating temperature is 75°C. Article 1.0.8 The insulation resistance measurement listed in this standard should use the insulation resistance value of 60s; the measurement of absorption ratio should use the ratio of the insulation resistance value of 60s to 15s; the polarization index should be the ratio of the insulation resistance value of 10min to 1min. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Article 1.0.9 When conducting insulation tests on multi-winding equipment, windings not under test should be short-circuited and grounded.
Article 1.0.10 When measuring insulation resistance, the voltage level of the megohmmeter shall be measured according to the following provisions unless otherwise specified in this standard: 1. For electrical equipment or circuits below 100V, a 250V megohmmeter shall be used; 2. For electrical equipment or circuits below 500V to 100V, a 500V megohmmeter shall be used. 3. For electrical equipment or circuits below 3000V to 500V, a 1000V megohmmeter shall be used; 4. For electrical equipment or circuits below 10000V to 3000V, a 2500V megohmmeter shall be used. 5. For electrical equipment or circuits above 10000V, a 2500V or 5000V megohmmeter shall be used.
Article 1.0.11
The high-voltage test method of this standard shall be carried out in accordance with the provisions of the current national standard "High Voltage Test Technology". Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Synchronous Generators and Phase Regulators
Article 2.0.1 The test items for synchronous generators and phase regulators with a capacity of 6000kW and above shall include the following:
1. Measure the insulation resistance and absorption ratio of the stator winding; 2. Measure the DC resistance of the stator winding; 2. DC withstand voltage test and leakage current measurement of the stator winding; 4. AC withstand voltage test of the stator winding;
5. Measure the insulation resistance of the rotor winding; 6. Measure the DC resistance of the rotor winding; 7. AC withstand voltage test of the rotor winding;
8. Measure the insulation resistance of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and the exciter armature; 9. The AC withstand voltage test of the excitation circuit of the generator or exciter together with the connected equipment Pressure test, excluding generator rotor and exciter armature, 10. Stator core test;
11. Measure the insulation resistance of the insulating bearings of the generator and exciter and the water inlet support of the rotor,
12. Measure the insulation resistance of the embedded thermometer and verify the temperature error; 13. Measure the DC resistance of the demagnetization resistor and the self-synchronous resistor; 14. Measure the ultra-transient reactance and negative sequence reactance; 15. Measure the AC impedance and power loss of the rotor winding, 16. Measure and record the three-phase short-circuit characteristic curve; 17. Measure and record the no-load characteristic curve;
18. Measure the demagnetization time constant when the generator stator is open-circuited, 19. Measure the stator residual voltage after the automatic demagnetization device of the generator is disconnected; Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Twenty. Measure the phase sequence,
Twenty-one. Measure the shaft voltage.
Note: ① Synchronous generators with a capacity of less than 6000kW and a voltage of more than 1kV shall be tested in all other items except item 14.
② Synchronous generators with a voltage of 1kV and below shall be tested in accordance with items 1, 2, 4, 5, 6, 7, 8, 9, 11, 12, 13, 20 and 21 of this article regardless of their capacity. ③ Synchronous phase regulators without starting motors or phase regulators whose starting motors are only allowed to run for a short time may not be tested in items 16 and 17 of this article. Article 2.0.2 The insulation resistance and absorption ratio of the stator winding shall be measured in accordance with the following provisions:
1. The unbalance coefficient of the insulation resistance of each phase shall not be greater than 2; 2. Absorption ratio: for asphalt impregnated and baked mica insulation, it shall not be less than 1.3; for epoxy powder mica insulation, it shall not be less than 1.6.
Note: ① Before conducting the AC withstand voltage test, the insulation of the motor winding shall meet the requirements of items 1 and 2. ② The water-cooled motor should be tested under the condition of eliminating the influence of residual water. ③ The motor that has passed the AC withstand voltage test can be put into operation without drying when its insulation resistance is close to the operating temperature and the epoxy powder mica insulated motor is not less than 1MQ per kilovolt of its rated voltage at room temperature. However, the end cover should not be removed for internal work before commissioning. ④ For water-cooled motors, the insulation resistance of the water collection pipe and the water diversion pipe should be measured. The resistance value should comply with the manufacturer's regulations.
Article 2.0.3 The measurement of the DC resistance of the stator winding shall comply with the following provisions: 1. The DC resistance shall be measured in a cold state, and the difference between the surface temperature of the winding and the ambient air temperature during measurement shall be within the range of ±3°C; 2. The DC resistance of each phase or each branch winding shall not exceed 2% of its minimum value after correcting the error caused by different lead lengths; compared with the value measured when the product leaves the factory and converted to the value at the same temperature, its relative change shall not be greater than 2%.
Article 2.0.4 The DC withstand voltage test and leakage current measurement of the stator winding shall comply with the following provisions:
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
1. The test voltage is 3 times the rated voltage of the motor. 3. The test voltage is increased in stages by 0.5 times the rated voltage per level, staying for 1 minute in each stage, and recording the leakage current; under the specified test voltage, the leakage current shall comply with the following provisions:
1. The difference in leakage current of each phase shall not be greater than 50% of the minimum value. When the maximum leakage current is below 20uA, the difference between each phase should not be significantly different from the factory test value.
2. The leakage current should not increase with time; when one of the above provisions is not met, the cause should be found and eliminated. 3. When the leakage current increases significantly and disproportionately with the voltage, it should be analyzed in time. 3. Hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. 4. When testing water-cooled motors, the low-voltage shielding method should be adopted. Article 2.0.5 The voltage used in the stator winding AC withstand voltage test shall comply with the provisions of Table 2.0.5. The insulation AC withstand voltage test of the stator winding of the hydro-turbine generator assembled on site during the process shall be carried out in accordance with the relevant provisions of the current national standard "Technical Specifications for Installation of Hydro-Turbine Generator Sets". Water-cooled motors are tested under water flow, and the water quality should be qualified; hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. Stator winding AC withstand voltage test voltage
Capacity (kw)
Below 10000
10000 and above
Note: Un is the rated voltage of the generator. Www.bzxZ.net
Rated voltage (V)
36 and above
3150~6300
6300 and above
Test voltage (V)
1.5Un+750
1.5Un+2250
Article 2.0.6 The insulation resistance of the rotor winding shall be measured in accordance with the following provisions:Article 7 When conducting various tests related to temperature and humidity, the temperature of the test object and the surrounding temperature and humidity should be measured at the same time. The insulation test should be carried out under good weather conditions, and the temperature of the test object and the surrounding temperature of the instrument should not be lower than 5°C, and the relative humidity of the air should not be higher than 80%.
During the test, attention should be paid to the influence of ambient temperature. For oil-immersed transformers, reactors and arc-extinguishing coils, the upper oil temperature of the transformer, reactor and arc-extinguishing coil should be used as the test temperature.
The normal temperature used in this standard is 10~40°C; the operating temperature is 75°C. Article 1.0.8 The insulation resistance measurement listed in this standard should use the insulation resistance value of 60s; the measurement of absorption ratio should use the ratio of the insulation resistance value of 60s to 15s; the polarization index should be the ratio of the insulation resistance value of 10min to 1min. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Article 1.0.9 When conducting insulation tests on multi-winding equipment, windings not under test should be short-circuited and grounded.
Article 1.0.10 When measuring insulation resistance, the voltage level of the megohmmeter shall be measured according to the following provisions unless otherwise specified in this standard: 1. For electrical equipment or circuits below 100V, a 250V megohmmeter shall be used; 2. For electrical equipment or circuits below 500V to 100V, a 500V megohmmeter shall be used. 3. For electrical equipment or circuits below 3000V to 500V, a 1000V megohmmeter shall be used; 4. For electrical equipment or circuits below 10000V to 3000V, a 2500V megohmmeter shall be used. 5. For electrical equipment or circuits above 10000V, a 2500V or 5000V megohmmeter shall be used.
Article 1.0.11
The high-voltage test method of this standard shall be carried out in accordance with the provisions of the current national standard "High Voltage Test Technology". Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Synchronous Generators and Phase Regulators
Article 2.0.1 The test items for synchronous generators and phase regulators with a capacity of 6000kW and above shall include the following:
1. Measure the insulation resistance and absorption ratio of the stator winding; 2. Measure the DC resistance of the stator winding; 2. DC withstand voltage test and leakage current measurement of the stator winding; 4. AC withstand voltage test of the stator winding;
5. Measure the insulation resistance of the rotor winding; 6. Measure the DC resistance of the rotor winding; 7. AC withstand voltage test of the rotor winding;
8. Measure the insulation resistance of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and the exciter armature; 9. The AC withstand voltage test of the excitation circuit of the generator or exciter together with the connected equipment Pressure test, excluding generator rotor and exciter armature, 10. Stator core test;
11. Measure the insulation resistance of the insulating bearings of the generator and exciter and the water inlet support of the rotor,
12. Measure the insulation resistance of the embedded thermometer and verify the temperature error; 13. Measure the DC resistance of the demagnetization resistor and the self-synchronous resistor; 14. Measure the ultra-transient reactance and negative sequence reactance; 15. Measure the AC impedance and power loss of the rotor winding, 16. Measure and record the three-phase short-circuit characteristic curve; 17. Measure and record the no-load characteristic curve;
18. Measure the demagnetization time constant when the generator stator is open-circuited, 19. Measure the stator residual voltage after the automatic demagnetization device of the generator is disconnected; Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Twenty. Measure the phase sequence,
Twenty-one. Measure the shaft voltage.
Note: ① Synchronous generators with a capacity of less than 6000kW and a voltage of more than 1kV shall be tested in all other items except item 14.
② Synchronous generators with a voltage of 1kV and below shall be tested in accordance with items 1, 2, 4, 5, 6, 7, 8, 9, 11, 12, 13, 20 and 21 of this article regardless of their capacity. ③ Synchronous phase regulators without starting motors or phase regulators whose starting motors are only allowed to run for a short time may not be tested in items 16 and 17 of this article. Article 2.0.2 The insulation resistance and absorption ratio of the stator winding shall be measured in accordance with the following provisions:
1. The unbalance coefficient of the insulation resistance of each phase shall not be greater than 2; 2. Absorption ratio: for asphalt impregnated and baked mica insulation, it shall not be less than 1.3; for epoxy powder mica insulation, it shall not be less than 1.6.
Note: ① Before conducting the AC withstand voltage test, the insulation of the motor winding shall meet the requirements of items 1 and 2. ② The water-cooled motor should be tested under the condition of eliminating the influence of residual water. ③ The motor that has passed the AC withstand voltage test can be put into operation without drying when its insulation resistance is close to the operating temperature and the epoxy powder mica insulated motor is not less than 1MQ per kilovolt of its rated voltage at room temperature. However, the end cover should not be removed for internal work before commissioning. ④ For water-cooled motors, the insulation resistance of the water collection pipe and the water diversion pipe should be measured. The resistance value should comply with the manufacturer's regulations.
Article 2.0.3 The measurement of the DC resistance of the stator winding shall comply with the following provisions: 1. The DC resistance shall be measured in a cold state, and the difference between the surface temperature of the winding and the ambient air temperature during measurement shall be within the range of ±3°C; 2. The DC resistance of each phase or each branch winding shall not exceed 2% of its minimum value after correcting the error caused by different lead lengths; compared with the value measured when the product leaves the factory and converted to the value at the same temperature, its relative change shall not be greater than 2%.
Article 2.0.4 The DC withstand voltage test and leakage current measurement of the stator winding shall comply with the following provisions:
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
1. The test voltage is 3 times the rated voltage of the motor. 3. The test voltage is increased in stages by 0.5 times the rated voltage per level, staying for 1 minute in each stage, and recording the leakage current; under the specified test voltage, the leakage current shall comply with the following provisions:
1. The difference in leakage current of each phase shall not be greater than 50% of the minimum value. When the maximum leakage current is below 20uA, the difference between each phase should not be significantly different from the factory test value.
2. The leakage current should not increase with time; when one of the above provisions is not met, the cause should be found and eliminated. 3. When the leakage current increases significantly and disproportionately with the voltage, it should be analyzed in time. 3. Hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. 4. When testing water-cooled motors, the low-voltage shielding method should be adopted. Article 2.0.5 The voltage used in the stator winding AC withstand voltage test shall comply with the provisions of Table 2.0.5. The insulation AC withstand voltage test of the stator winding of the hydro-turbine generator assembled on site during the process shall be carried out in accordance with the relevant provisions of the current national standard "Technical Specifications for Installation of Hydro-Turbine Generator Sets". Water-cooled motors are tested under water flow, and the water quality should be qualified; hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. Stator winding AC withstand voltage test voltage
Capacity (kw)
Below 10000
10000 and above
Note: Un is the rated voltage of the generator.
Rated voltage (V)
36 and above
3150~6300
6300 and above
Test voltage (V)
1.5Un+750
1.5Un+2250
Article 2.0.6 The insulation resistance of the rotor winding shall be measured in accordance with the following provisions:Article 10 When measuring insulation resistance, the voltage level of the megohmmeter shall be implemented in accordance with the following provisions unless otherwise specified in this standard: 1. For electrical equipment or circuits below 100V, a 250V megohmmeter shall be used; 2. For electrical equipment or circuits below 500V to 100V, a 500V megohmmeter shall be used. 3. For electrical equipment or circuits below 3000V to 500V, a 1000V megohmmeter shall be used; 4. For electrical equipment or circuits below 10000V to 3000V, a 2500V megohmmeter shall be used. 5. For electrical equipment or circuits above 10000V, a 2500V or 5000V megohmmeter shall be used. Article 1.0.11 The high-voltage test method of this standard shall be carried out in accordance with the provisions of the current national standard "High Voltage Test Technology". Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Synchronous Generators and Phase Regulators
Article 2.0.1 The test items for synchronous generators and phase regulators with a capacity of 6000kW and above shall include the following:
1. Measure the insulation resistance and absorption ratio of the stator winding; 2. Measure the DC resistance of the stator winding; 2. DC withstand voltage test and leakage current measurement of the stator winding; 4. AC withstand voltage test of the stator winding;
5. Measure the insulation resistance of the rotor winding; 6. Measure the DC resistance of the rotor winding; 7. AC withstand voltage test of the rotor winding;
8. Measure the insulation resistance of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and the exciter armature; 9. The AC withstand voltage test of the excitation circuit of the generator or exciter together with the connected equipment Pressure test, excluding generator rotor and exciter armature, 10. Stator core test;
11. Measure the insulation resistance of the insulating bearings of the generator and exciter and the water inlet support of the rotor,
12. Measure the insulation resistance of the embedded thermometer and verify the temperature error; 13. Measure the DC resistance of the demagnetization resistor and the self-synchronous resistor; 14. Measure the ultra-transient reactance and negative sequence reactance; 15. Measure the AC impedance and power loss of the rotor winding, 16. Measure and record the three-phase short-circuit characteristic curve; 17. Measure and record the no-load characteristic curve;
18. Measure the demagnetization time constant when the generator stator is open-circuited, 19. Measure the stator residual voltage after the automatic demagnetization device of the generator is disconnected; Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Twenty. Measure the phase sequence,
Twenty-one. Measure the shaft voltage.
Note: ① Synchronous generators with a capacity of less than 6000kW and a voltage of more than 1kV shall be tested in all other items except item 14.
② Synchronous generators with a voltage of 1kV and below shall be tested in accordance with items 1, 2, 4, 5, 6, 7, 8, 9, 11, 12, 13, 20 and 21 of this article regardless of their capacity. ③ Synchronous phase regulators without starting motors or phase regulators whose starting motors are only allowed to run for a short time may not be tested in items 16 and 17 of this article. Article 2.0.2 The insulation resistance and absorption ratio of the stator winding shall be measured in accordance with the following provisions:
1. The unbalance coefficient of the insulation resistance of each phase shall not be greater than 2; 2. Absorption ratio: for asphalt impregnated and baked mica insulation, it shall not be less than 1.3; for epoxy powder mica insulation, it shall not be less than 1.6.
Note: ① Before conducting the AC withstand voltage test, the insulation of the motor winding shall meet the requirements of items 1 and 2. ② The water-cooled motor should be tested under the condition of eliminating the influence of residual water. ③ The motor that has passed the AC withstand voltage test can be put into operation without drying when its insulation resistance is close to the operating temperature and the epoxy powder mica insulated motor is not less than 1MQ per kilovolt of its rated voltage at room temperature. However, the end cover should not be removed for internal work before commissioning. ④ For water-cooled motors, the insulation resistance of the water collection pipe and the water diversion pipe should be measured. The resistance value should comply with the manufacturer's regulations.
Article 2.0.3 The measurement of the DC resistance of the stator winding shall comply with the following provisions: 1. The DC resistance shall be measured in a cold state, and the difference between the surface temperature of the winding and the ambient air temperature during measurement shall be within the range of ±3°C; 2. The DC resistance of each phase or each branch winding shall not exceed 2% of its minimum value after correcting the error caused by different lead lengths; compared with the value measured when the product leaves the factory and converted to the value at the same temperature, its relative change shall not be greater than 2%.
Article 2.0.4 The DC withstand voltage test and leakage current measurement of the stator winding shall comply with the following provisions:
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
1. The test voltage is 3 times the rated voltage of the motor. 3. The test voltage is increased in stages by 0.5 times the rated voltage per level, staying for 1 minute in each stage, and recording the leakage current; under the specified test voltage, the leakage current shall comply with the following provisions:
1. The difference in leakage current of each phase shall not be greater than 50% of the minimum value. When the maximum leakage current is below 20uA, the difference between each phase should not be significantly different from the factory test value.
2. The leakage current should not increase with time; when one of the above provisions is not met, the cause should be found and eliminated. 3. When the leakage current increases significantly and disproportionately with the voltage, it should be analyzed in time. 3. Hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. 4. When testing water-cooled motors, the low-voltage shielding method should be adopted. Article 2.0.5 The voltage used in the stator winding AC withstand voltage test shall comply with the provisions of Table 2.0.5. The insulation AC withstand voltage test of the stator winding of the hydro-turbine generator assembled on site during the process shall be carried out in accordance with the relevant provisions of the current national standard "Technical Specifications for Installation of Hydro-Turbine Generator Sets". Water-cooled motors are tested under water flow, and the water quality should be qualified; hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. Stator winding AC withstand voltage test voltage
Capacity (kw)
Below 10000
10000 and above
Note: Un is the rated voltage of the generator.
Rated voltage (V)
36 and above
3150~6300
6300 and above
Test voltage (V)
1.5Un+750
1.5Un+2250
Article 2.0.6 The insulation resistance of the rotor winding shall be measured in accordance with the following provisions:Article 10 When measuring insulation resistance, the voltage level of the megohmmeter shall be implemented in accordance with the following provisions unless otherwise specified in this standard: 1. For electrical equipment or circuits below 100V, a 250V megohmmeter shall be used; 2. For electrical equipment or circuits below 500V to 100V, a 500V megohmmeter shall be used; 3. For electrical equipment or circuits below 3000V to 500V, a 1000V megohmmeter shall be used; 4. For electrical equipment or circuits below 10000V to 3000V, a 2500V megohmmeter shall be used; 5. For electrical equipment or circuits above 10000V, a 2500V or 5000V megohmmeter shall be used. Article 1.0.11 The high-voltage test method of this standard shall be carried out in accordance with the provisions of the current national standard "High Voltage Test Technology". Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter 2 Synchronous Generators and Phase Regulators
Article 2.0.1 The test items for synchronous generators and phase regulators with a capacity of 6000kW and above shall include the following:
1. Measure the insulation resistance and absorption ratio of the stator winding; 2. Measure the DC resistance of the stator winding; 2. DC withstand voltage test and leakage current measurement of the stator winding; 4. AC withstand voltage test of the stator winding;
5. Measure the insulation resistance of the rotor winding; 6. Measure the DC resistance of the rotor winding; 7. AC withstand voltage test of the rotor winding;
8. Measure the insulation resistance of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and the exciter armature; 9. The AC withstand voltage test of the excitation circuit of the generator or exciter together with the connected equipment Pressure test, excluding generator rotor and exciter armature, 10. Stator core test;
11. Measure the insulation resistance of the insulating bearings of the generator and exciter and the water inlet support of the rotor,
12. Measure the insulation resistance of the embedded thermometer and verify the temperature error; 13. Measure the DC resistance of the demagnetization resistor and the self-synchronous resistor; 14. Measure the ultra-transient reactance and negative sequence reactance; 15. Measure the AC impedance and power loss of the rotor winding, 16. Measure and record the three-phase short-circuit characteristic curve; 17. Measure and record the no-load characteristic curve;
18. Measure the demagnetization time constant when the generator stator is open-circuited, 19. Measure the stator residual voltage after the automatic demagnetization device of the generator is disconnected; Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Twenty. Measure the phase sequence,
Twenty-one. Measure the shaft voltage.
Note: ① Synchronous generators with a capacity of less than 6000kW and a voltage of more than 1kV shall be tested in all other items except item 14.
② Synchronous generators with a voltage of 1kV and below shall be tested in accordance with items 1, 2, 4, 5, 6, 7, 8, 9, 11, 12, 13, 20 and 21 of this article regardless of their capacity. ③ Synchronous phase regulators without starting motors or phase regulators whose starting motors are only allowed to run for a short time may not be tested in items 16 and 17 of this article. Article 2.0.2 The insulation resistance and absorption ratio of the stator winding shall be measured in accordance with the following provisions:
1. The unbalance coefficient of the insulation resistance of each phase shall not be greater than 2; 2. Absorption ratio: for asphalt impregnated and baked mica insulation, it shall not be less than 1.3; for epoxy powder mica insulation, it shall not be less than 1.6.
Note: ① Before conducting the AC withstand voltage test, the insulation of the motor winding shall meet the requirements of items 1 and 2. ② The water-cooled motor should be tested under the condition of eliminating the influence of residual water. ③ The motor that has passed the AC withstand voltage test can be put into operation without drying when its insulation resistance is close to the operating temperature and the epoxy powder mica insulated motor is not less than 1MQ per kilovolt of its rated voltage at room temperature. However, the end cover should not be removed for internal work before commissioning. ④ For water-cooled motors, the insulation resistance of the water collection pipe and the water diversion pipe should be measured. The resistance value should comply with the manufacturer's regulations.
Article 2.0.3 The measurement of the DC resistance of the stator winding shall comply with the following provisions: 1. The DC resistance shall be measured in a cold state, and the difference between the surface temperature of the winding and the ambient air temperature during measurement shall be within the range of ±3°C; 2. The DC resistance of each phase or each branch winding shall not exceed 2% of its minimum value after correcting the error caused by different lead lengths; compared with the value measured when the product leaves the factory and converted to the value at the same temperature, its relative change shall not be greater than 2%.
Article 2.0.4 The DC withstand voltage test and leakage current measurement of the stator winding shall comply with the following provisions:
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
1. The test voltage is 3 times the rated voltage of the motor. 3. The test voltage is increased in stages by 0.5 times the rated voltage per level, staying for 1 minute in each stage, and recording the leakage current; under the specified test voltage, the leakage current shall comply with the following provisions:
1. The difference in leakage current of each phase shall not be greater than 50% of the minimum value. When the maximum leakage current is below 20uA, the difference between each phase should not be significantly different from the factory test value.
2. The leakage current should not increase with time; when one of the above provisions is not met, the cause should be found and eliminated. 3. When the leakage current increases significantly and disproportionately with the voltage, it should be analyzed in time. 3. Hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. 4. When testing water-cooled motors, the low-voltage shielding method should be adopted. Article 2.0.5 The voltage used in the stator winding AC withstand voltage test shall comply with the provisions of Table 2.0.5. The insulation AC withstand voltage test of the stator winding of the hydro-turbine generator assembled on site during the process shall be carried out in accordance with the relevant provisions of the current national standard "Technical Specifications for Installation of Hydro-Turbine Generator Sets". Water-cooled motors are tested under water flow, and the water quality should be qualified; hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. Stator winding AC withstand voltage test voltage
Capacity (kw)
Below 10000
10000 and above
Note: Un is the rated voltage of the generator.
Rated voltage (V)
36 and above
3150~6300
6300 and above
Test voltage (V)
1.5Un+750
1.5Un+2250
Article 2.0.6 The insulation resistance of the rotor winding shall be measured in accordance with the following provisions:1. Test items for synchronous generators and phase regulators with a capacity of 6000kW and above shall include the following:
1. Measure the insulation resistance and absorption ratio of the stator winding; 2. Measure the DC resistance of the stator winding; 2. DC withstand voltage test and leakage current measurement of the stator winding; 4. AC withstand voltage test of the stator winding;
5. Measure the insulation resistance of the rotor winding; 6. Measure the DC resistance of the rotor winding; 7. AC withstand voltage test of the rotor winding;
8. Measure the insulation resistance of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and exciter armature; 9. AC withstand voltage test of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and exciter armature; 10. Stator core test;| |tt||11. Measure the insulation resistance of the insulating bearings of the generator and exciter and the water inlet support of the rotor.
12. Measure the insulation resistance of the embedded thermometer and verify the temperature error.
13. Measure the DC resistance of the demagnetization resistor and the self-synchronization resistor.
14. Measure the super transient reactance and negative sequence reactance.
15. Measure the AC impedance and power loss of the rotor winding.
16. Measure and record the three-phase short-circuit characteristic curve.
17. Measure and record the no-load characteristic curve.
18. Measure the demagnetization time constant when the generator stator is open-circuited.
18. Measure the stator residual voltage after the automatic demagnetization device of the generator is disconnected.
19. Measure the phase sequence.
21. Measure the shaft voltage.
Note: ① Synchronous generators with a capacity of less than 6000kW and a voltage of more than 1kV should be subject to the remaining items except the fourteenth item.
② Synchronous generators with voltages of 1kV and below, regardless of their capacity, shall be tested in accordance with the first, second, fourth, fifth, sixth, seventh, eighth, ninth, eleventh, twelve, thirteenth, twentieth and twenty-first clauses of this article. ③ Synchronous phase regulators without starting motors or phase regulators whose starting motors are only allowed to run for a short time may not be tested in the sixteenth and seventeenth clauses of this article. Article 2.0.2 The measurement of the insulation resistance and absorption ratio of the stator winding shall comply with the following provisions:
1. The unbalance coefficient of the insulation resistance of each phase shall not be greater than 2; 2. Absorption ratio: for asphalt impregnated and baked mica insulation, it shall not be less than 1.3; for epoxy powder mica insulation, it shall not be less than 1.6.
Note: ① Before conducting the AC withstand voltage test, the insulation of the motor windings shall meet the requirements of the first and second clauses. ② Water-cooled motors should be tested under the condition of eliminating the influence of residual water. ③ For motors that have passed the AC withstand voltage test, when their insulation resistance is close to the operating temperature and the epoxy powder mica insulated motor is not less than 1MQ per kilovolt of its rated voltage at room temperature, they can be put into operation without drying. However, the end cover should not be removed for internal work before commissioning. ④ For water-cooled motors, the insulation resistance of the water collection pipe and the water diversion pipe should be measured. The resistance value should comply with the manufacturer's regulations.
Article 2.0.3 The measurement of the DC resistance of the stator winding shall comply with the following provisions: 1. The DC resistance shall be measured in a cold state, and the difference between the surface temperature of the winding and the ambient air temperature during measurement shall be within the range of ±3°C; 2. The DC resistance of each phase or each branch winding, after correcting the error caused by the different lead lengths, shall not differ by more than 2% of its minimum value; compared with the value measured when the product leaves the factory and converted to the value at the same temperature, its relative change shall not be greater than 2%.
Article 2.0.4 The DC withstand voltage test and leakage current measurement of the stator winding shall comply with the following provisions:
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
1. The test voltage is 3 times the rated voltage of the motor. 3. The test voltage is increased in stages by 0.5 times the rated voltage per level, staying for 1 minute in each stage, and recording the leakage current; under the specified test voltage, the leakage current shall comply with the following provisions:
1. The difference in leakage current of each phase shall not be greater than 50% of the minimum value. When the maximum leakage current is below 20uA, the difference between each phase should not be significantly different from the factory test value.
2. The leakage current should not increase with time; when one of the above provisions is not met, the cause should be found and eliminated. 3. When the leakage current increases significantly and disproportionately with the voltage, it should be analyzed in time. 3. Hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. 4. When testing water-cooled motors, the low-voltage shielding method should be adopted. Article 2.0.5 The voltage used in the stator winding AC withstand voltage test shall comply with the provisions of Table 2.0.5. The insulation AC withstand voltage test of the stator winding of the hydro-turbine generator assembled on site during the process shall be carried out in accordance with the relevant provisions of the current national standard "Technical Specifications for Installation of Hydro-Turbine Generator Sets". Water-cooled motors are tested under water flow, and the water quality should be qualified; hydrogen-cooled motors must be tested before hydrogen filling or after hydrogen discharge and when the hydrogen content is below 3%. It is strictly forbidden to test during the hydrogen replacement process. Stator winding AC withstand voltage test voltage
Capacity (kw)
Below 10000
10000 and above
Note: Un is the rated voltage of the generator.
Rated voltage (V)
36 and above
3150~6300
6300 and above
Test voltage (V)
1.5Un+750
1.5Un+2250
Article 2.0.6 The insulation resistance of the rotor winding shall be measured in accordance with the following provisions:1. Test items for synchronous generators and phase regulators with a capacity of 6000kW and above shall include the following:
1. Measure the insulation resistance and absorption ratio of the stator winding; 2. Measure the DC resistance of the stator winding; 2. DC withstand voltage test and leakage current measurement of the stator winding; 4. AC withstand voltage test of the stator winding;
5. Measure the insulation resistance of the rotor winding; 6. Measure the DC resistance of the rotor winding; 7. AC withstand voltage test of the rotor winding;
8. Measure the insulation resistance of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and exciter armature; 9. AC withstand voltage test of the excitation circuit of the generator or exciter together with the connected equipment, excluding the generator rotor and exciter armature; 10. Stator core test;| |tt||11. Measure the insulation resistance of the insulating bearings of the generator and exciter and the water inlet support of the rotor.
12. Measure the insulation resistance of the embedded thermometer and verify the temperature error.
13. Measure the DC resistance of the demagnetization resistor and the self-synchronization resistor.
14. Measure the super transient reactance and negative sequence reactance.
15. Measure the AC impedance and power loss of the rotor winding.
16. Measure and record the three-phase short-circuit characteristic curve.
17. Measure and record the no-load characteristic curve.
18. Measure the demagnetization time constant when the generator stator is open-circuited.
18. Measure the stator residual voltage after the automatic demagnetization device of the generator is disconnected.
19. Measure the phase sequence.
21. Measure the shaft voltage.
Note: ① Synchronous generators with a capacity of less than 6000kW and a voltage of more than 1kV should be subject to the remaining items except the fourteenth item.
② Synchronous generators with voltages of 1kV and below, regardless of their capacity, shall be tested in accordance with the first, second, fourth, fifth, sixth, seventh, eighth, ninth, eleventh, twelve, thirteenth, twentieth and twenty-first clauses of this article. ③ Synchronous phase regulators without starting motors or phase regulators whose starting motors are only allowed to run for a short time may not be tested in the sixteenth and seventeenth clauses of this article. Article 2.0.2 The measurement of the insulation resistance and absorption ratio of the stator winding shall comply with the following provisions:
1. The unbalance coefficient of the insulation resistance of each phase shall not be greater than 2; 2. Absorption ratio: for asphalt impregnated and baked mica insulation, it shall not be less than 1.3; for epoxy powder mica insulation, it shall not be less than 1.6.
Note: ① Before conducting the AC withstand voltage test, the insulation of the motor windin
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