This standard specifies the technical requirements, test methods and inspection rules for winding turn-to-turn impulse voltage testers. This standard is applicable to turn-to-turn testers with rated output peak voltages of 5kV, 15kV and 40kV, and meet the requirements of JB/Z 293 AC high-voltage motor stator winding turn-to-turn insulation test specifications and JB/Z 294 AC low-voltage motor loose-embedded winding turn-to-turn insulation test methods. JB/T 7080-1993 Winding turn-to-turn impulse voltage tester JB/T7080-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T70807083-93
JB/T7088~7089-93
Electric Tool Standard
(3-2）
1993-10-08 Issued
Ministry of Machinery Industry of the People's Republic of China
1994-01-01 Implementation
JB/T7080--93
JB/T7C81-93
JB/T7(82--93
JB/T7083-93
JB/T7088-93
JB/T7089-33
Winding Turn-to-Turn Impulse Voltage Tester·
Electrical test instrument model compilation method. Insulation dielectric withstand voltage test equipment
Low voltage electrical appliance impulse voltage tester.
Partial discharge detector
High voltage oscilloscope for impulse test.
1 Subject content and scope of application
Machinery industry standard of the People's Republic of China
Winding turn-to-turn impulse voltage tester
JB/T7080-93
This standard specifies the technical requirements, test methods and inspection rules of the winding turn-to-turn impulse voltage tester (hereinafter referred to as the turn-to-turn tester).
This standard is applicable to rated output peak voltages of 5kV, 15kV, and 40kV, meeting JB/Z293 AC High-voltage motor stator winding turn-to-turn insulation test specification, JB/Z294 AC low-voltage motor scattered winding turn-to-turn insulation test method specified turn-to-turn tester. 2 Reference standards
GB3100
GB3101
GB4793
GB6593
JB/Z293
JB/Z294
ZBY003
ZBY002
3 Technical requirements
International system of units and its application
General principles for units and symbols
High voltage test technology
Safety requirements for electronic measuring instruments
Inspection rules for electronic measuring instruments
Chang Specification for inter-turn insulation test of stator winding of AC high-voltage motor Test method for inter-turn insulation of loose winding of AC low-voltage motor General technical conditions for instrument packaging
Basic environmental conditions and test methods for transportation and storage of instruments and meters The inter-turn tester should be able to be used normally under the following working conditions 3.1
Environmental temperature -10~35℃;
Atmospheric pressure 70.0-106.0kPa,
Relative air humidity is not more than 80%;
Power supply voltage ~220±10%50±2%.
Safety of inter-turn tester
The safety of inter-turn tester should meet the requirements of Class I electronic instruments specified in GB4793. The inter-turn tester should have sufficient insulation resistance and dielectric strength. 3.2.2
The insulation resistance between the parts with power supply voltage and the casing of the turn-to-turn tester shall be not less than 2MQ: The parts with power supply voltage and the casing of the turn-to-turn tester shall be able to withstand a test voltage of 1.5kV, with a real sine wave waveform and a frequency of 50Hz for 1min without breakdown or flashover. The accessible metal parts of the turn-to-turn tester that will be energized when the insulation fails should be permanently and reliably connected to the internal grounding terminal of the instrument or the grounding pin of the instrument inlet socket, and meet the following requirements: a. The grounding connection should not use a screwless terminal; all parts of the grounding terminal should not be corroded due to contact between these parts and the copper or any other metal of the grounding wire; b. The resistance value between the grounding terminal or grounding pin and the part required to be connected to it should not be greater than 0.5α; a clear and durable grounding symbol ★ should be marked near the grounding terminal or grounding pin. This symbol cannot be marked on detachable parts such as screws.
JB/T7080-93
3.2.4 The high voltage output terminal shall be marked with a red lightning bolt. 3.2.5 The creepage distance and electrical clearance between the internal components of the instrument shall comply with the provisions of Article 9.5.4 of GB4793. 3.3 Appearance quality of the turn-to-turn tester
3.3.1 The instrument shell shall have no obvious defects, and the coating of the shell shall have no delamination and peeling. 3.3.2 The shell of the instrument shall not cause sharp corners and burrs that may cause harm when touched by hands. 3.3.3
The text symbols of various quantities and units on the instrument panel shall comply with the provisions of GB3100 and GB3101, and the handwriting and symbols shall be clear and not easy to erase.
3.4 ​​Output impulse peak voltage measurement accuracy. The impulse peak voltage measurement error shall not exceed ±5%. 3.5 Output impulse voltage apparent wavefront time
The apparent wavefront time of impulse voltage can be divided into three levels: 0.1, 0.5, and 1.2us (0.5us is recommended), with an allowable deviation of ±30%. The apparent wavefront time T is shown in Figure 1.
T is the wavefront time between 0.1 and 0.9 peak voltages. 3.6 Output impulse voltage waveform coincidence
The output impulse wave waveform should coincide, and there should be no double line phenomenon. Test method
Test conditions and instrument equipment requirements
The test environment conditions should meet the following requirements: Ambient temperature
20±2℃,
45%~75%;
Relative humidity
Atmospheric pressure 86~106kPa.
The test power supply shall meet the following requirements,
Rated voltage
~200V±1%;
50Hz±1%.
Rated frequency
4.2 Appearance quality inspection
Inspect by visual inspection
T,=1.25 T,
The inspection result shall meet the requirements of Article 3.3.
4.3 Marking inspection
Inspect by visual inspection and the following test
JB/T7080-93
Wipe gently with a cloth dipped in alcohol or water, the marking shall not be wiped off, and the inspection result shall meet the requirements of Articles 3.2.3, 3.2.4, and 3.3.3. 4.4 Peak voltage accuracy measurement
The measurement circuit is shown in Figure 2.
Load voltage
Inter-voltage withstand tester
Voltage divider
Oscilloscope
Or peak voltage meter
4.4.1 The peak voltage meter and digital storage oscilloscope used for calibration shall have an accuracy of 1.5%, an input impedance greater than 1MQ and not greater than 50pF, and shall have sufficient response time to ensure measurement accuracy. 4.4.2 The voltage divider of the measurement system shall be a pure resistance type voltage divider with a resistance value of not less than 5kn, a stable voltage divider ratio, and an error of not more than 0.5%.
The square wave response time of the voltage divider shall not exceed 50ns. 4.4.3 The high voltage impact load resistor shall be a pure resistor with a resistance value of 0.2, 0.5, 1kQ and an accuracy of 5%. The rated output peak voltage and load resistance of the instrument are shown in the table below: Peak voltage kv
Load resistance ka
4.4.4 When the peak part of the waveform has oscillation or overshoot, and the amplitude is greater than 5% of the peak value, the highest peak value of the waveform oscillation center line shall be used as the test peak voltage.
4.4.5 The peak voltage measurement shall comply with the provisions of Article 3.4. 4.5 The output impulse voltage apparent wavefront time measurement circuit is shown in Figure 2.
4.5.1 The apparent wavefront time is measured using an oscilloscope with an accuracy of 5% and sufficient response time. 4.5.2 When the apparent wavefront time oscillates, oscillations less than 5% of the peak value are allowed. When the oscillation amplitude exceeds 5% of the peak value, the center line of the oscillation waveform can be used as the apparent wavefront waveform.
The apparent wavefront time shall comply with the provisions of Article 3.5. 4.6 Output waveform coincidence check
4.6.1 When the X-axis scanning speed of the instrument under test is the maximum, an inductive load is applied externally. After the impulse wave voltage is applied, the instrument will only display 1 to 3 attenuated oscillation waveforms along the X-axis direction, and the Y-axis peak is close to the full scale. At this time, there should be no visible double line phenomenon. 4.6.2 For an oscilloscope with waveform subtraction function, the two output subtraction waveforms should be a horizontal straight line. 4.7 Insulation resistance measurement and withstand voltage test
4.7.1 Insulation resistance measurement
Between the power supply voltage, including the circuit equivalent to this circuit and all other externally accessible circuits and the casing, apply a 500V DC voltage and stabilize it for 5s to measure the insulation resistance.
The measurement result should comply with the provisions of Article 3.2.2a. 4.7.2 Withstand voltage test
JB/T7080-93
Following 4.7.1 test.
During the test, the applied voltage shall not exceed half of the full value of the test voltage, then rapidly increase to the full value and maintain for 1 minute, then rapidly decrease to below half the value, and then disconnect the power supply. The test results shall comply with the provisions of Article 3.2.2b. 4.8 Grounding inspection
Inspect by visual inspection and the following methods.
When measuring the resistance value between the accessible metal parts and the protective grounding terminal, a single-phase alternating current of 25A shall be passed, and the voltage drop across the resistor shall not exceed 12.5V. At this time, the corresponding resistance value is 0.5a. The inspection results shall comply with the provisions of Article 3.2.3.
5 Inspection rules
5.1 Each turn-to-turn tester must be tested and qualified by the quality inspection department according to the requirements of this standard before it can be shipped out of the factory. When leaving the factory, it shall be accompanied by documents proving the product's qualification.
5.2 The items specified in this standard are inspection test items Appearance inspection
Marking inspection
Insulation resistance measurement
Withstand voltage test
Grounding inspection
Measurement of impulse voltage apparent wavefront time
Bee value voltage accuracy measurement
Waveform coincidence inspectionWww.bzxZ.net
5.3 Inspection method
5.3.1 Before the test, the turn-to-turn tester should be energized at rated voltage for not less than 5 minutes. 5.3.2 The test shall be carried out on a prototype in the order specified in Article 5.2, and all tests shall be passed. 6
Packaging, transportation, storage
Marking,
The turn-to-turn tester shall be marked with the following items:
Product name;
Product model;
Rated output peak voltage;
Manufacturer name or trademark;
Factory number.
6.2 The following documents shall be attached to the instrument when it leaves the factory: Product certificate.
Instruction manual
The instruction manual shall explain the following contents:
Working principle, characteristics and purpose of the instrument;
Safety precautions for the use of the instrument, possible dangers and corresponding preventive measures: Matters related to the maintenance of the instrument.
JB/T7080-93
The packaging, transportation and storage of the turn-to-turn tester shall comply with the relevant provisions of ZBY003 and ZBY002. 6.3
Additional Notes:
This standard was proposed and managed by the Shanghai Electric Tool Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Shanghai Electric Tool Research Institute and the Xi'an High Voltage Electrical Equipment Research Institute. The main drafters of this standard were Xu Yaojiang and Liu Shunkong.
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