Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7620
1994-12-09
JB/T76201994
This standard specifies the type, basic specifications, technical requirements, test methods and inspection rules of compensated AC voltage stabilizers (hereinafter referred to as voltage stabilizers).
This standard is only applicable to dry-type AC voltage stabilizers composed of compensation transformers and voltage regulating transformers and their control circuits. For pulsating conversion type voltage stabilizers, it can also be used as a reference in the case of coordination with relevant standards. 2 Reference standards
GB1980
GB 2900. 1
GB3859
GB2681
GB2682
GB3768
GB4208
GB2423
Standard voltage
Rated frequency of electrical equipment
Basic terms for electrical engineering Basic terms for electrical engineering Semiconductor converters
Wire colors in complete sets of electrical equipment
Color of indicator lights and buttons in complete sets of electrical equipment Determination of noise source level power
Classification of enclosure protection levels
Basic environmental test procedures for electrical and electronic products General technical conditions for packaging of electromechanical products
G3/T 13384
ZB K42 001
Voltage regulator
Contact white voltage regulator
2B K42 002
3 Terms
This chapter mainly gives the terms related to voltage stabilizers. For other related terms, see GB29C0.1. 3.1 Compensating transformer
A transformer that changes the magnitude and polarity of the voltage applied to the primary line to make the secondary coil connected in series in the load circuit produce a compensation voltage with variable value and polarity.
3.2 Voltage regulator
A special contact voltage regulator that changes the magnitude and polarity of the auxiliary output voltage by changing the contact position of the brush. 3.3 Control circuit
A circuit used to control the devices and equipment in the main circuit and auxiliary circuit. 3.4 Compensated AC voltage stabilizer
[It should be composed of a compensating transformer, a voltage transformer and a control circuit. It is used to achieve the equipment to stabilize the output voltage within the specified accuracy range.
3.5 Rated input voltage
The voltage specified to be applied to the input terminal of the regulator. 3.6 Input voltage range
The range of the input voltage of the regulator from the minimum (lower limit) to the maximum (upper limit), which can usually be expressed as a fraction of the rated input voltage.
1994-12-09
1995-06-01
.
3. Rated output voltage
JB/T7620
The output voltage determined by the manufacturer as the basis for calculation. 3.8 Rated output current
The output current determined by the manufacturer as the basis for calculating the duty cycle and overload capacity. 3.9 Voltage regulation accuracy
The percentage of the change in output voltage relative to the rated output voltage within the specified range of input voltage fluctuation and load current change.
3.10 Load loss
The maximum active power consumed by the voltage regulator within the specified input voltage range when the output terminal of the voltage regulator is open-circuited. 3.11 Load loss
The active power consumed when the output terminal of the voltage regulator is short-circuited, the input voltage is adjusted, and the output current is equal to the rated output current. 3.12 Power efficiency
The ratio of output power to input power.
3.13 Three-phase voltage asymmetry
The ratio of negative sequence component to positive sequence component.
3.14 Relative harmonic content (harmonic distortion factor) The ratio of the RMS value of the harmonic content to the RMS value of the AC quantity. 3.15 Overload current
Under specified working conditions, the rated RMS current can be output within a short period of time (in seconds or minutes). 3.16 Fixed time
The time required for the output voltage to adjust to the specified voltage regulation range due to power supply voltage fluctuations and (or) load current changes (see Figure 1).
Input voltage step
Time
+Allowable limit
Center value
-Allowable limit
4 Models and basic parameters
4.1 Model
4.2 Basic parameters
4.2.1 Rated capacity level
JB/T7620
Rated capacity (kVA)
Design number
Regulator||tt ||Compensated
Three-phase (S) or single-phase (D)
The rated output capacity of the voltage stabilizer should be selected from the following values (kVA): 10.16 (15), 20, 25, 31.5 (32), 40, 50, 63 (60), 80, 100, 160 (150), 200, 250, 315 (320), 400, 500, 630 (600), 800, 1000, * (the values in brackets are non-preferred values). 4.2.2 Rated voltage level
The rated output voltage of the voltage stabilizer should be selected from the following values (V): 220 (single-phase), 380 (three-phase)
When the above levels cannot meet the use requirements, they should be determined in accordance with GB156 or by agreement between the user and the manufacturer. 4.2.3 Rated frequency
The rated frequency of the stabilizer is 50Hz.
For the rated frequency of 60Hz, it shall be agreed upon by the user and the manufacturer. When other frequencies are selected, they shall comply with the provisions of GB381980. 5 Technical requirements
5.1 Normal use conditions
5.1.1 Environmental conditions
a The altitude shall not exceed
Note: When the altitude exceeds 1000m. The load capacity of the stabilizer will decrease with the increase of the altitude. The correction method shall be in accordance with the provisions of Appendix B of GB38SS.2
b. The ambient air temperature of the equipment operation shall be the minimum temperature 0℃ and the maximum temperature + 40℃. The daily average temperature of cooling air shall not exceed +30℃, the annual average temperature shall not exceed +25℃, and the temperature change rate of the working environment shall not exceed 5K/h; Note: When the operating ambient temperature is higher than the specified value, the load capacity of the voltage stabilizer will be reduced, and the correction method shall be in accordance with the provisions of Appendix A of B3859.2. The minimum relative humidity of the air is 15%, and the maximum relative humidity shall not exceed 90% (at 20℃). The relative humidity change rate shall not exceed 5% per hour, and dew shall not occur;
Note: The maximum temperature of dew-free operation during the change of ambient humidity and humidity shall be in accordance with the provisions of Appendix C of GB3859.2. The operating location shall be free of conductive or explosive dust, and free of corrosive metal or insulating materials or steam. 5. 1. 2 AC input power supply conditions:
a. The allowable fluctuation range of input voltage is recommended to be selected from the following values: ±10%, ±15%, ±20%,
JB/T7620
. When the above effective values cannot meet the use requirements, the user is allowed to agree with the manufacturer on the main values. b. The positive frequency fluctuation of input voltage should not exceed ±2%, and the positive frequency fluctuation and the negative voltage fluctuation should not occur at the same time, and vice versa. &, the asymmetry of three-phase voltage should not be greater than 5%: d. The relative harmonic content of AC voltage waveform should not exceed 10%, 5.2 Abnormal use cases
5.2.1 High relative humidity and temperature similar to subtropical or tropical climate conditions. 5.2.2 Excessive dust in the surrounding air, 5.2.3 Salty air (such as near the sea), high humidity, dripping water, or corrosive gas. 5.2.4 Exposure to steam or oil mist.
5.2.5 Exposure to explosive powder or gas mixture, 5.2.6 Exposure to radioactive radiation
5.2.7 Abnormal mechanical stress, such as shock and vibration. 5.2.8 Other non-normal use conditions other than the above conditions or conditions exceeding the limits specified in Article 5.1. If any of the above conditions exist, the user shall propose it when placing an order and agree with the manufacturer. 5.3 Rated value
5.3.1 Allowable fluctuation range of input voltage
When the AC input power supply voltage changes within the range specified in 5.1.2, the voltage regulator shall be able to ensure the voltage regulation accuracy of the rated output voltage. 5.3.2 Rated output voltage
When the input voltage is within the allowable fluctuation range, the voltage regulator shall be able to ensure the rated output voltage when outputting 100% of the rated current. 5.3.3 Rated output current
Under specified working conditions, when the load power factor is 1, 0 (resistive load), the regulator should be able to ensure continuous output of rated current at rated output voltage.
Note: The rated current is 4, 2.1 and the rated capacity. 5.3.4 Rated output frequency
The rated output frequency of the voltage stabilizer shall be clearly specified in the product standard, and its rated frequency level shall comply with the provisions of 4.2.3. S.3.5 Relative harmonic content of output voltage waveform Compared with the input voltage waveform, the increment of its relative harmonic content shall not be greater than 1%. 5.3.6 Asymmetry of output voltage
The asymmetry of the three-phase no-load output voltage of the voltage stabilizer shall be compared with the asymmetry of the input voltage, and its increment shall not be greater than 1%. 5.3.7 Overload capacity
When the voltage stabilizer works at the continuous output rated current, it is allowed to apply a short-term overload current, and its overload degree and duration shall comply with the provisions of Table 1.
Overload battery
5.4 Technical performance
5.4.1 Voltage stabilization accuracy
Duration
The product standard shall specify the range of change of specific conditions and the corresponding voltage stabilization accuracy of the rated output voltage. The value is recommended to be selected from the following levels:
JB/T7620
±1%, ±2%, ±3%, ±4%, ±5%. 1994
Products can be equipped with adjustable devices with a voltage stabilization accuracy within the range of ±(15)%. 5. 4. 2 Stabilization time
When the input voltage of the voltage regulator changes by 10% relative to the rated value under no-load conditions, the stabilization time should not exceed 1.5. 5. 4.3 Efficiency
Within the allowable fluctuation range of the input voltage, the efficiency of the voltage regulator under the working conditions of rated output voltage, rated output current and load power factor of 1.0, shall comply with the provisions of Table 2. Table 2
Rated capacity
≥50~16
>109~1000
5.4.4 Temperature rise
Under the specified load conditions, after the voltage regulator is thermally stabilized, the maximum temperature rise of its internal components shall comply with the provisions of Table 3. 3. Components and parts of semiconductor devices and their electronic components, components, main circuit conductor connections, busbar (bar connections), and the limit temperature rise K shall not exceed the corresponding standards. The limit temperature rise of stainless steel: 45 with pot plating, 55 with silver-beryllium layer, 70 with stainless steel, 35 with nickel-aluminum, 25 with dry-type compensating transformer and high-voltage transformer shall comply with the provisions of Table 4. 4.5 Brush life span
Voltage transformer insulation system temperature
A(105C)
E(120C)
B(130C)
F(1155)
A(1C5C)
E(120C)
B(130C)
F(1 55C)
Test method
Thermometer method, thermocouple method, sensitive thermal device
Measurement method
Electrode method
Thermocouple method or thermal sensitive device
Do not subject the adjacent insulated materials to the temperature of the thermocouple method or potentiometer
When the rated voltage is input and the rated current is output, when the input voltage changes continuously within the specified range, the voltage regulating transformer and its control part and the motor should be adjusted accordingly. The number of automatic adjustments should not be less than 10,000 times, and the brush loss should not be greater than 1mm
During the adjustment process, the brush burn level is less than or equal to 11/4: The grinding surface of the line valve is allowed to have black marks that can be removed with alcohol or gasoline, but no burn marks are allowed.
5. 4. 6 Protection
JB/T7620
In addition, the voltage stabilizer should be equipped with overvoltage protection. When the output voltage exceeds 10% of the rated value, the overvoltage protection system should be activated within the time specified by the product standard, and sound and light alarms should be sounded: b. The voltage stabilizer should be equipped with overload protection. When the load exceeds the overload energy specified in the product standard, the overload protection system should be activated within the specified time, and sound and light alarms should be sounded:
The voltage stabilizer should be equipped with short-circuit protection!
, The voltage stabilizer should be equipped with phase sequence protection and short circuit protection (for voltage stabilizers using three-phase motors as driving components; e.
The voltage stabilizer should also be equipped with short circuit protection and delayed output protection. 5. 4. 7 Safety and grounding
4. 4.7. 1 The device should be groundable. The resistance between the metal parts that may be touched and the grounding point of the shell should not be less than 1P. The grounding wire should be a double negative wire with yellow/green alternating. The total grounding of the device should have an obvious grounding mark 5.4.7.2 Protective grounding to prevent electric shock The device should have protective facilities to prevent electric shock. The frame, door and cover of the structure should be reliably grounded. The wire cross section of the grounding point should meet the requirements of Table 5. The main line feeding the device should be the cutting machine! 15 5.4.7.3 Functional grounding The device can be equipped with a grounding to ensure certain functions (such as protection from interference, etc.) 5.4. 8 Distance between electrical room and power supply
The cross-sectional area of the main connection point should be % of the cross-sectional area of the main conductor, but not less than 16m
The clearance and creepage distance between the live circuits of the voltage stabilizer and the live parts to the conductive parts or grounded parts should comply with the provisions of Table 6.
Constant insulation voltage V
Cross-spot (RMS)
>60250
>250~380
>75~-300
7300-450
5.4.9 Insulation resistance and withstand voltage
5.4.9.1 Insulation resistance
Gas gap
Rated 63A
Electrical distance mm
Rated current>634
Electrical distance mm
Electrical distance mm
Before the withstand voltage test, Use a megohmmeter to measure the insulation resistance of the tested part. When the ambient temperature is 20 ± 3 and the relative humidity is 9%, the insulation resistance between the grounded circuit and the ground (shell) should be no less than 1M. 5.4.9.2 Withstand voltage strength
The withstand voltage strength between each energized circuit and the other (shell) and the circuit without electrical connection should be able to withstand the power frequency test voltage value specified in Table 7 for 1 minute,
>69~125
>125~250|| tt||250~500
JB/T7620
Test voltage (RMS value)
Note, UM is the expected maximum peak medium voltage between any pair of terminals. The inductive withstand strength of the compensating transformer and the voltage regulating transformer in the voltage stabilizer shall comply with the requirements of Article 4.2.4 of ZBK42UU1. 5.4.10
When the voltage stabilizer is running stably under rated conditions, the noise generated shall not be higher than 65dB (A) 5.4. 11 External protection level of cabinet-type equipment shall comply with the current definition of P20 level in GB4208. 5.4.12 Operational performance: The voltage stabilizer should have a correct operation procedure (start and stop) and measures to prevent misoperation and ensure personal safety: a. When the voltage is at any position within the specified input voltage range, the voltage stabilizer should operate normally regardless of "manual or automatic": b. When the brush moves to the limit position, the limit switch should operate correctly and cut off the power supply of the control circuit, and the motor stops rotating: c. The contact between the brush and the line should be good, the movement should be smooth, and there should be no jumping or power failure. 5. 4. 13 E. Control circuit The control circuit in the voltage stabilizer should comply with the product standard, and the control circuit of the same specification should be interchangeable. 5. 4-14 Display
The voltage stabilizer shall be equipped with parameter displays for input voltage, output voltage, and output current, and shall have signal displays for input terminal power, power-on operation, fault status, etc. Other parameters and signals that need to be displayed shall be determined by the manufacturer or the manufacturer and the user. 5.5 General requirements for components and auxiliary parts
5.5.1 Components, devices and auxiliary parts
The electrical components, transformers, motors, etc. that make up the voltage stabilizer shall comply with the provisions of the relevant standards and installation schedule. 5.5.2 The color of indicator lights and buttons
shall comply with the provisions of GB 2682,
5.5.3 The color of wires and busbars
shall comply with the provisions of CB2681.
5.5.4 Cabinet structure
The cabinet structure surface should be smooth, flat, without burrs and rust. The paint layer should be smooth and flat, without pockets, bubbles and flow marks, and the paint film should be strong.
The overall dimensions, seams, installation hole spacing and assembly of the cabinet structure should comply with the relevant standards or technical documents. 5. 5. 5 Allowable deviation
The allowable deviation limit range of the compensation transformer and the transformer parameters should comply with the provisions of Article 4.1 of ZBK42001. 6 Test method
The accuracy of the voltmeter, ammeter and power meter selected for the test should not be lower than Class 0.5, and the mutual inductor should not be lower than Class 0.2. 6.1 Insulation resistance determination
The insulator used to measure the insulation resistance should comply with the provisions of 8. Rated insulation voltage and other standards are
>60~250
22561000
JB/T76201994
When measuring, it is allowed to connect or disconnect some parts such as printed circuit boards, capacitors, etc. The measurement should be carried out between the circuit and the grounded parts of the cabinet and between the conductive parts that are not electrically connected to each other. 6.2 Withstand voltage test
The test should be carried out between the circuit and the grounded parts and between the conductive parts that are not electrically connected to each other. During the test, the printed circuit board and multi-connector components can be dropped, disconnected, or replaced with standard samples. For some components (such as transformers, mutual inductors, etc.) that may cause high voltage to enter the low positive circuit due to insulation damage, they should be subjected to the same test voltage as the main circuit during the test (or before the test). For the outer surface of the insulating material, the corresponding parts should be covered with a metal film before the withstand voltage test. During the test, a sine wave voltage is applied. The time for the voltage to rise from zero to the specified value should be no less than 10s, and the specified test voltage should be maintained for 1min. There should be no breakdown or flashover. After the test, a megohmmeter with appropriate voltage level should be used to re-measure the insulation resistance. If it is still not less than 1MA, it is qualified. Note: The test method for the compensating transformer and the voltage regulating transformer in the voltage stabilizer shall be carried out in accordance with the provisions of 2LK42002 Section 5.3.2 and Section 5.3.8. 6.3 No-load test
Open the output end of the voltage stabilizer. Within the allowable fluctuation range of the input voltage, take 5 points as the input voltage value, measure the no-load current and no-load loss. Take the average value of the three phases as the test result of no-load current and no-load loss. Its value should not exceed the provisions of the product standard. 6.4 Low-voltage and high-current test
Short-circuit the output end of the voltage stabilizer so that the voltage regulating transformer is in the adjustment position of the lower input voltage. The input terminal is connected to the power supply, and the input voltage is adjusted from the minimum value so that the short-circuit output current is equal to the rated output current. The input voltage U, input current I and power loss P are measured. The short-circuit loss Pk and impedance voltage drop Uk are taken as the arithmetic average of the three-phase P and U respectively, and the short-circuit loss should be converted to the short-circuit loss Pk (75) at 75°C. Its supply should not exceed the product specification. The sum of the no-load loss and load loss specified in the product standard should meet the efficiency requirements of Article 5.4.3. 6.5 Load test
Connect a resistor load to the output terminal of the voltage stabilizer. Within the allowable range of input voltage, select 5 points as the input voltage value, adjust the load respectively, and the voltage stabilizer outputs the rated current when the rated voltage is output, which meets the requirements of Articles 5.3.2 and 5.3.3. The load test of large-capacity equipment can be carried out at the operating site or determined by the manufacturer and the user. 6.6 De-rising test
The test shall be carried out at the lower limit of the input voltage range and the rated output current until the thermal balance of the voltage regulator reaches a stable level. The measured temperature rise of each component such as the winding, brush contact, and main circuit wire connection shall not exceed the provisions of Table 3 and Table 4 of Article 5.4.4. The temperature rise measurement point shall be specified in the product standard or technical documents. This test can be carried out using the phase watt load method, short circuit method or direct load method. 6.7 Overload capacity test
The test shall be carried out at the rated input voltage and rated output current, applying the overload current specified in Table 1 of Article 5.3.7 and its corresponding duration. The measured temperature rise of each component such as the winding, brush contact, and main circuit wire connection shall not exceed the provisions of Table 3 and Table 4 of Article 5.4.4. The measurement method is the same as that of Article 6.G
6.8 Voltage stabilization accuracy test
During the test, the voltage stabilizer is in no-load voltage stabilization operation. Within the allowable fluctuation range of the input voltage specified in the product standard, the output voltage corresponding to each point is measured, and the voltage stabilization accuracy is calculated according to formula (1). Voltage stabilization accuracy = the integral value reached after disturbance - rated value × 100% rated value
JB/T76201994
The calculated voltage stabilization accuracy should comply with the product standard. The voltage stabilization accuracy test relative to the load current change shall be determined by negotiation between the manufacturer and the user. .9 Determination of relative harmonic content (harmonic distortion factor) of output voltage When rated power supply voltage is input, the voltage stabilizer is under the peak load conditions specified in the product standard. The total RMS value of the input voltage and the output voltage and the RMS value of the harmonic voltage after filtering out the fundamental wave are measured using a spectrum analyzer or other spectrum analyzer. The relative harmonic content of the input voltage and the output voltage are calculated and compared respectively. The measured relative harmonic content of the output voltage shall comply with the provisions of Article 5.3.5. 6.10 Determination of output voltage asymmetry
Under the specified power supply conditions and the voltage stabilizer is unloaded, the line voltages of the three-phase input and output phases are measured, and the asymmetry of the input voltage and the output voltage are calculated respectively according to Figure 2. AB, BC, CA in the figure are the measured three-phase line voltages, and O and P are the two vertices of two equilateral triangles with CA as the common point. The positive voltage asymmetry is calculated according to formula (2): OBU
Wherein, K—voltage asymmetry;
U,——voltage positive sequence component, V;
U.—voltage negative sequence component, V.
Comparison of the calculation results of input voltage and output voltage asymmetry shall comply with the provisions of 5.3.6. 6.11 Operation performance test
This test is used to verify the requirements of 5.4.12, and its test method shall be specified by the product standard. 6.12 Protection performance test
This test is used to verify the requirements of 5.4.6, and its test method shall be specified by the product standard. 6.13 Stability time
When the input voltage of the voltage regulator changes by +10% and -10% relative to the rated value under no-load condition, the stability time of the positive voltage output of the voltage regulator shall be measured respectively, which shall comply with the provisions of the product standard. This test can be combined with the no-load test. The stable time test corresponding to the step change of load current shall be jointly designed and conducted by the user and the manufacturer. This test can be combined with the load test. 9
6,11 Efficiency determination
JB/T76201994
When the input voltage is within the allowable fluctuation range, the efficiency is measured under the resistive load, and the minimum value is taken as the efficiency test result. For smaller voltage stabilizers, the AC input and output power can be directly measured in combination with the load test, and calculated according to formula (3): Output AC power
Voltage conversion rate×100%
For stabilizers of 50kVA and above, it is recommended to use direct measurement method or internal loss determination method to determine the efficiency, and calculate according to formula (4): Output AC power
Sum of output AC energy consumption×100%... When determining the efficiency by the internal loss determination method, the manufacturer shall state the component losses included and excluded. 6.15 Brush life test bzxZ.net
The test power supply changes back and forth continuously within the maximum input voltage range of the tested voltage regulator, and a counter is provided to record the number of back and forth changes (one back and forth counts as one time). The input terminal of the tested voltage regulator is connected to the output terminal of the test power supply. When the input voltage is the rated value, a suitable load is selected to make the output current of the voltage regulator the rated value. After starting, the number of brush changes is recorded. During the test, a discontinuous 24h test is allowed. Lubrication of the transmission device of the voltage regulator is allowed, and brush powder remaining on the grinding surface is allowed to be removed. The test should be continuous and uninterrupted in the last 6h. For large-capacity voltage regulators, due to the limitations of test equipment and load conditions, an equivalent brush life test is allowed for the voltage regulator or the brush group of the voltage regulator. The equivalent test current value is calculated according to formula (5). The life test number and technical requirements are the same as those of the voltage regulator whole machine test.
I-[IN×(UN/Umn)]-(KrXN) .--
Where: Ip-equivalent test current value, A, UN—rated output current, V;
Uirh——lower limit of input voltage fluctuation allowed, VKa-—compensation transformer ratio (Kg>1)
N is the number of brush groups in the voltage regulating transformer. During the entire test, the voltage stabilizer should work normally and meet the requirements specified in 5.4.5. )
After the test, the voltage regulator should pass the voltage stabilization accuracy and operation performance test. If there is no zero or component damage, the life test is considered to have passed.
6.16 Noise test
The test should be conducted in a place where there is no sound reflection surface within 2m. Take at least two points as measurement points at a vertical distance of 0.5~1.0m from the equipment operating surface and 1.2~1.6m from the ground. When measuring, the test unit should face the equipment sound source and take the measurement value of the point with the most serious noise.
The test method is in accordance with GB3768. Sound level meter or other noise measurement equipment can be used. The influence of ambient noise on the measurement results should be avoided as much as possible during the test.
6.17 The enclosure protection level test should be conducted on new and used formal products. The test product should be in a static state without power supply during the test. Before the test, the temporary seals (such as anti-rust grease, paint, etc.) at the joints of the enclosure should be removed. The test method of IP20 protection level should be conducted in accordance with CB4208. 6.18 Environmental test
The items of environmental test shall be specified in the product standard or the agreement between the user and the manufacturer. The test method shall comply with the relevant provisions of GB2423. 7 Inspection rules
.1 Inspection classification
The inspection of the device includes factory inspection and type inspection (type test). 7.1.1 Type inspection is used to verify whether the tested device meets the requirements of the standard. Type inspection shall be carried out on a device sample, or on a device or component manufactured according to the same (or similar) design. The inspection shall be carried out on different samples of the same form. 10
JB/T7620
When conducting type inspection, if one item is found to be unqualified, it shall be returned for re-inspection. If it is still unqualified. The device is judged as unqualified in the type inspection.
Type tests should generally be carried out in the following situations: new products or old products are transferred to the factory for trial production and identification, b,
After formal production, if there are major changes in structure, materials, and processes, which may affect product performance: During normal production, regular (no more than 5 years) or after accumulating a certain output, a weekly inspection should be carried out: After a long-term suspension of production, when the production is resumed: When the factory inspection results are significantly different from the last type inspection; When the national quality supervision and management agency proposes a requirement for type inspection, 7.1.2 Factory inspection
Factory inspection is used to inspect components: defects in materials and processes and whether the product meets the requirements of technical standards. Each unit must be inspected for factory inspection.
During the factory inspection process, if any item fails, the device is judged to be unqualified. 7.1.3 Optional test
This type of test is only carried out when required by the contract or relevant documents. .2 Inspection Items
Factory inspection of voltage stabilizer products, type inspection items and relevant technical requirements and inspection methods are shown in Table 9. Table 9
Inspection Items
General Inspection
Insulation Resistance Determination and Withstand Voltage Test
Voltage Test
Low Voltage and High Current Test
Load Test
Ramp Test
Overload Capacity Test
Stability Test
Output Voltage Relative Noise Content Determination
Output Voltage Asymmetry Test
Operation Performance Test
Protection Long-Term Test
Overvoltage Protection
b. Overvoltage Protection Current protection
C. Short circuit protection
2. Phase sequence protection
e. Phase loss protection
Delay protection
Name-delay output protection
Stabilization time test
Efficiency rating
Electrical life test
Noise test
Enclosure protection grade inspection
Environmental test
Type factory
Selectivity
Inspection test
Technical requirements and inspection methods
5. 4.7,5. 4.8,5. 4.13,5.4.14.5. 5, 1 ~5. 5. 45. 4. 91 6. 1~ 6. 2+
5. 5. 5, 6. 3
5. 5.5 6. 4
5. 3. 21 5. 3. 3+ 6 . 5
5. 4. 4, 6. G
5. 3. T+ 5. 4. 4+ 6.7
5, 3. 11 5. 4. 1+ 6. 6
5. 3. 51 6. 9
5.3.6#6.10
5. 4, 12; 6. 11
5 ±- 6+ 6. 12
5. 4. 2t 6. 13
5. 4. 3# 6+ 14
5. 4. 5# 6. 15
5. 4. 10: 6.16
5. 4. 11 6.174, 6. G
5. 3. T+ 5. 4. 4+ 6.7
5, 3. 11 5. 4. 1+ 6. 6
5. 3. 51 6. 9
5.3.6#6.10
5. 4, 12; 6. 11
5 ±- 6+ 6. 12
5. 4. 2t 6. 13
5. 4. 3# 6+ 14
5. 4. 5# 6. 15
5. 4. 10: 6.16
5 . 4. 11 6. 174, 6. G
5. 3. T+ 5. 4. 4+ 6.7
5, 3. 11 5. 4. 1+ 6. 6
5. 3. 51 6. 9
5.3.6#6.10
5. 4, 12; 6. 11
5 ±- 6+ 6. 12
5. 4. 2t 6. 13
5. 4. 3# 6+ 14
5. 4. 5# 6. 15
5. 4. 10: 6.16
5 . 4. 11 6. 17
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