This standard specifies the verification items and technical requirements, verification instruments, verification methods, verification results and treatment of enameled round wire softening and breakdown tester. This standard is applicable to the verification of enameled round wire softening and breakdown tester. JB/T 4279.8-1994 Verification method of enameled winding wire test equipment Softening and breakdown tester JB/T4279.8-1994 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 4279.8 -1994
Verification method of enameled winding wire test instrument and equipment Softening breakdown tester
Published on December 9, 1994
Ministry of Machinery Industry of the People's Republic of China
Implementation on June 1, 1995
Mechanical Industry Standard of the People's Republic of China
Verification method of enameled winding wire test instrument and equipment Softening breakdown tester
1 Subject content and scope of application
JB/T4279.8-1994
Replaces JB4279.8-1986
This standard specifies the verification items and technical requirements, verification instruments, verification methods, verification results and processing of enameled round wire softening breakdown tester.
This standard applies to the calibration of enameled round wire softening breakdown tester. 2 Reference standards
JB/T4279.1 General principles for calibration methods of enameled winding wire test equipment Calibration items and technical requirements
3.1 The size of the heating mold of the enameled round wire softening breakdown tester is 100mm×100mm×70mm, and the allowable error is 1mm. The mold material is brass.
3.2 The two wire grooves of the tester heating mold should be vertical, and the intersection angle is 90°±5°. 3.3 The test voltage between the two specimens should be AC ​​100±10V. 3.4 When a current of 5±0.5mA passes through the two specimens, the tester should send a softening breakdown signal. 3.5 The short-circuit current between the specimens should not exceed 50mA. 3.6 The difference between the indicated temperature of the test instrument and the actual temperature of the intersection of the sample shall not exceed 2℃3.7 The allowable error of the test timing device for 120s is ±5s. 3.8
The load and the allowable error shall comply with the provisions of Table 1
Error±
Instruments for verification
Protractor.
4.2 Vernier caliper, 125mm, graduation value 0.02mm. 4.3 AC voltmeter, Class 1.5.
4.4 AC milliampere level, Class 1.5.
4.5 Thermocouple, nickel-copper-nickel (constantan), nickel-nickel-silicon or their materials, with a tested wire diameter of 0.5mm and a node diameter of not more than 2.0mm. www.bzxz.net
4.6 DC digital voltmeter, the allowable measurement error is ±0.05%. When using nickel-copper-nickel (constantan) thermocouples, the resolution of the digital voltmeter shall not be less than 10V; when using other thermocouples, the resolution of the digital voltmeter shall not be less than 1μV. 4.7 Stopwatch, graduation value 0.1s.
4.8 Frame balance and table scale, balance graduation value 1g; table scale graduation value 5g4.9 Variable resistor.
Approved by the Ministry of Machinery Industry on December 9, 1994
Implemented on June 1, 1995
Verification method
5.1 General inspection
5.1.1 The tester is in a horizontal position.
JB/T4279.8-1994
5.1.2 Place the two specimens in the wire slot and lower the pressure rod. Check whether the intersection of the specimens is under the pressure rod. 5.2 Use a vernier caliper to measure the size of the heating mold. 5.3 Check the intersection angle of the two wire slots with a protractor. 5.4 Measure the test voltage with an AC voltmeter. 5.5 Connect the variable resistor and the AC milliammeter between the two test electrodes, gradually reduce the resistance of the resistor, and check the current indication value when the tester sends a breakdown signal.
5.6 Connect the AC milliammeter between the two test electrodes to check the short-circuit current. 5.7 Adjust the tester to the specified temperature. After entering the constant temperature state, place the thermocouple at the intersection of the two samples, lower the pressure rod, and check the difference between the temperature at the intersection of the two samples and the indicated temperature of the tester. 5.8 Use a stopwatch to measure the error of the timing device of the tester for 120s. 5.9 Use a balance and table to measure the load.
Processing of verification results
6.1 A verification certificate will be issued to the qualified enameled round wire softening breakdown tester, and a verification result notice will be issued to the unqualified one. The cover forms of the verification certificate and verification result notification are shown in the appendix of JB/T4279.1. 6.2 The initial verification of the enameled round wire softening breakdown tester is carried out according to all verification items, and the periodic verification only needs to verify the items specified in Articles 5.4, 5.5, 5.7 and 5.8 of this standard.
6.3 The verification cycle of the enameled round wire softening breakdown tester is generally set at 2 years. Additional notes:
This standard was proposed and managed by the Shanghai Cable Research Institute of the Ministry of Machinery Industry. This standard was drafted by the 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
Enameled Winding Wire Test Instrument and Equipment Verification Method Softening Breakdown Tester
JB/T 4279.8 - 1994
Published by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Printing 1-xXX
Postal Code 100044)
Sheet X/X
Number of Words XXX,XXX
Printing x, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn61- 86
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