JB/T 4279.13-1994 Verification methods for enameled winding wire test equipment High voltage paint film continuity tester
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Verification Method of Enameled Winding Wire Test Instrument and Equipment High Voltage Paint Film Continuity Tester
Subject Content and Scope of Application
JB/T4279.1394
Replaces JB4279.13-86
This standard specifies the verification items and technical requirements, verification instruments, verification methods, verification results and processing of enameled round wire high voltage paint film continuity tester.
This standard is applicable to the verification of enameled round wire high voltage paint film continuity tester. 2 Reference Standards
JB/T4279.1 General Rules for Verification Method of Enameled Winding Wire Test Instrument and Equipment 3 Verification Items and Technical Requirements
3.1 The tester electrodes and guide wheels shall comply with the provisions of Figures 1 and 2. ±0.25
Figure 1 Electrode-guide wheel for enameled round wire with nominal diameter of 0.050mm or more and 0.250mm or less,
Approved by the Ministry of Machinery Industry on December 9, 1994
One electrode,Www.bzxZ.net
One sample.
Implemented on June 1, 1995
JB/T4279.1394
@50±0.25
45°±0.5°
Figure 2 Electrode-guide wheel for enameled round wire with nominal diameter of 0.250mm or more and 1.600mm or less,
2--Electrode,
3-Sample.
3.2 The test voltage shall be a filtered smooth DC voltage with positive polarity to the ground, and its ripple coefficient shall be less than 5%. 3.3 The test voltage shall be 350V, 500V, 750V, 1000V, 1500V, 2000V, 2500V and 3000V, with a total of 8 levels, and the allowable error is ±5%.
3.4 At any test voltage, the steady-state short-circuit current shall be 25±5μA. 3.5 At any test voltage, the voltage drop on the contact wheel (electrode wheel) caused by the 50M defect resistance shall not exceed 75%. 3.6 The sensitivity of the defect detection circuit shall comply with the provisions of the following table. Test voltage V
Defect current disease value μA
Difference ±μA
The response time of the defect detection circuit is 5±1ms. 750
When the bare wire contacts the electrode, the repetitive counting frequency of the defect counting circuit is 500±50 times/min. The speed of the sample passing the electrode shall be 18±1m/min. The driving motor should be a non-dramatic motor, the high-voltage wiring should not use shielded wire, and the guide wheel should be at the same potential as the take-up wheel. The test specimen with a nominal diameter of 1.600mm should be used for the test, and the test speed should be guaranteed to be 18±1m/min. 4 Calibration instruments
4.1 Vernier caliper 125mm, graduation value 0.02mm. 4.2 Test voltage measuring instrument.
4.2.1 Electrostatic voltmeter 1.5 level, with a range of 600V, 1500V, and 3000V. 2500
4.2.2 Digital voltmeter with an input impedance greater than or equal to 1000M, with an allowable error of ±1%, or other voltmeters with equivalent accuracy. 4.3 1000M resistor. Self-made as Figure 3, used as a voltage divider resistor, the voltage divider ratio is 999; 1.35
JB/T4279.1394
Figure 3 Schematic diagram of resistor voltage divider
1—high voltage end, .2—voltage divider end (measurement end): 4——RJ type metal film resistor 999MO,
4.4 Skin indicator.
4.5 DC ammeter 1.0 level, resolution is 0.1μA. 4.6 Stopwatch, division value 0.1S.
4.7 Tachometer, division value 0.1m/min.
4.8 Square wave generator 0~1000Hz.
4.950MO resistor.
Adjustable micro current source 020μA.
5 Verification method
5.1. General inspection
1 Ground terminal:
RJ type metal film resistor 1M.
5.1.1 The insulation of the tester electrode to the ground should be made of high-resistance material, which should not absorb moisture, leak electricity, be easy to clean, and withstand 3000V voltage for a long time.
5.1.2 The motor should be a brushless motor, and the high-voltage wiring should not use shielded wire. The guide wheel should have the same potential as the take-up wheel. 5.1.3 Install the conductor with a nominal diameter of 0.06mm. When starting the motor, ensure that the sample is not broken. 5.2 Use a vernier caliper to measure the size of the test electrode and guide wheel. 5.3 Measurement of pulsation coefficient.
5.3.1 Connect a 1000Mn resistor between the electrode and the take-up wheel of the tester. 5.3.2 Connect the ground of the oscilloscope to the take-up reel, and connect the input terminal of the oscilloscope to the voltage divider terminal of the resistor. 5.3.3 Measure the voltage values of 350V, 1500V, and 3000V and the peak-to-peak value of the pulsating voltage, and calculate the pulsation coefficient according to formula (1). S
Where: U,-.—-Peak-to-peak value of the AC component, V; U. —Test voltage, V.
5.4 Measure the test voltage
P×100%
5.4.1 Select an electrostatic voltmeter with a suitable range and measure the 8 test voltage levels respectively. 5.4.2 When using a digital meter with an input impedance greater than or equal to 1000MO for measurement, use formula (2) to calculate: R. ·U'
Where: U-test voltage value, V;
U\reading value of the measuring instrument, V;
R. Input impedance of the measuring instrument, Mn:
I—Steady-state short-circuit current under the test voltage range, μA. (1)
5.5 To measure the steady-state short-circuit current, connect the DC ammeter between the test electrode and the take-up wheel, and measure the steady-state short-circuit current of each range respectively. 5.6 To measure the voltage drop caused by the 50MQ defective resistor, connect the wires according to Figure 4, measure the test voltage when the 50MQ resistor is connected at each test voltage range, and calculate the voltage drop of the test voltage according to formula (3). -×%
Where,—voltage drop percentage,
U. Test voltage, V;
U,—test voltage when the 50Mn defective resistor is connected, V. 10
2——RJ type resistor 50MQ
Test electrode;
Guide wheel:
4 Voltage measuring instrument.
5.7 Measure the sensitivity of the defect detection circuit. Connect according to Figure 5, adjust the micro-current source at each test voltage level, and measure the current value when the defect counter of the tester counts stably.
1——High voltage paint film continuity tester;
——Tester detection signal input terminal;
3—DC ammeter;
4-—Adjustable micro-current source
5.8 Measure the response time of the defect detection circuit, connect according to Figure 6, adjust the frequency of the signal generator at any test voltage level, measure the frequency when the defect counter of the tester starts counting, and calculate the response time of the defect detection circuit according to formula (4). 2f
Where: T is the response time of the defect detection circuit, S; it is the frequency of the signal generator, Hz.
1—High-voltage paint film continuity tester;
2—Tester detection signal input terminal;
3—Square wave signal generator.
5.9 Measurement of the speed of the sample passing through the electrode. Install a sample with a nominal conductor diameter of about 1.6 mm, start the tester, and use a tachometer to measure the linear speed of the sample. The linear speed measured within a length of 30 m should comply with 18±1 m/min. 5.10 Measurement of the bare wire repetition counting frequency. Install a bare copper wire, start the tester, and use a stopwatch to measure the time t used by the defect counter to count 500 times. Calculate the bare wire repetition counting frequency according to formula (5). 37
JB/T4279.1394
60X500
Where: F—repetitive counting frequency of defect counting circuit, times/min; t-time, s.
6 Processing of verification results
6.1 A verification certificate shall be issued to qualified high-voltage paint film continuity testers. A verification result notice shall be issued to unqualified ones. The cover forms of verification certificate and verification result notice are shown in the appendix of JB/T4279.1. 6.2 The first verification of high-voltage paint film continuity tester shall be verified according to all items. During periodic verification, only the items specified in Articles 5.1.3 and 5.4 to 5.10 of this standard shall be verified. 6.3 The verification cycle of high-voltage paint film continuity tester is generally set at 1 year. 38
JB/T4279.13~94
Appendix A
Derivation of formulas for measuring voltage using a high input impedance digital voltmeter (reference)
A1 Equivalent circuit consisting of a high voltage paint film continuity tester and a high input impedance digital voltmeter. A
U—open circuit output voltage of the tester,
U\—reading of the measuring instrument;
A2 Derivation of formulas
Output resistance of the tester;
Input impedance of the measuring instrument.
In Figure A1, R and U are unknown, R. , U' is known, the output resistance R of the tester can be indirectly obtained by measuring the short-circuit output current of the tester between AB with a DC ammeter: R
Where: R—output resistance of the tester;
U——open-circuit output voltage of the tester;
I-short-circuit output current of the tester,
When the measuring instrument measures the voltage of the tester, according to the Thevenin theorem, the voltage between A and B is equal to the tester side and the measuring instrument side from the equivalent circuit, and the voltage between AB is equal to U\, so: U
R+R.
From formula (A1) and formula (A3), it can be obtained:
Where: U-
-test voltage of the tester, V;
U'.(R+R.)
1-R. T
U\reading value of the measuring instrument, V;
R. —Input impedance of the measuring instrument, a; I-Steady-state short-circuit current of the test instrument, A.
JB/T4279.13-94
Additional Notes:
This standard was proposed and managed by Shanghai Cable Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shanghai Cable Research Institute of the Ministry of Machinery Industry and others. The main drafter of this standard is Zhu Bing.
People's Republic of China
Mechanical Industry Standard
Verification Method for Enameled Winding Wire Test Instruments and Equipment JB/T4279.1~4279.13-94
Beijing Electrical Engineering Comprehensive Technical and Economic Research Institute, Ministry of Machinery, Xiangtan Electrical Engineering Standardization Research Office, Ministry of Machinery
Edited, published and issued
(No. 302, Xiashesi Street, Xiangtan City, Hunan Province)
Printed by Xiangtan Electric Motor Factory Printing Plant
Format 880×12301/16 Printing Sheet No. 2 Number of Words 80000 First Edition in September 1995, First Printing in September 1995 Number of Prints 1--250
Printing No. DB838
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