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Undertake the installation (repair, test) power facility permit level II (220KV) test equipment

Serial number test equipment selection equipment model specification equipment name applicable test items 1 intelligent dual display insulation resistance tester insulation resistance measurement transformer winding insulation resistance and absorption ratio measurement AJ2000 5000V/200G2 power frequency resonance withstand voltage test device on-site high voltage large capacity cable , Transformers, GIS, switches, etc. AC withstand voltage test AJBX3 DC resistance tester transformer winding DC resistance measurement AJZC-50A4 earth grid ground resistance tester ground resistance measurement AJ9055 DC high voltage generator DC withstand voltage and DC leakage measurement surge arrester DC reference voltage Serial number test equipment selection equipment model specification equipment name applicable test items 1 intelligent dual display insulation resistance tester insulation resistance measurement transformer

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20

2019-11

To undertake the installation (repair, test) power facility license level three (110KV) test equipment

 Release time: 2019-11--20

erial number test equipment selection equipment model specifications equipment name applicable test items 1 intelligent dual display insulation resistance tester insulation resistance measurement transformer winding insulation resistance and absorption ratio measurement AJ2000 5000V/200G2 frequency conversion series resonance AC withstand voltage test device 110KV substation various electrical Equipment AC withstand voltage test AJBX270/2703 DC resistance tester Transformer winding DC resistance measurement AJZC-10A4 Ground resistance tester Ground resistance measurement AJ9055 DC high voltage generator DC withstand voltage and DC leakage measurement Lightning

20

2019-11

Undertake installation (repair, test) power facility permit level four (35KV) test equipment

 Release time: 2019-11--20

Test equipment selection equipment model specifications equipment name applicable test items 1 intelligent dual display insulation resistance tester insulation resistance measurement transformer winding insulation resistance and absorption ratio measurement AJ2000 5000V/200G2 test transformer withstand voltage test YD-10/1003 DC resistance test Instrument transformer winding DC resistance measurement AJZC-10A4 Earth resistance tester Earth resistance measurement AJ9055 DC high voltage generator DC withstand voltage and DC leakage measurement Lightning arrester DC reference voltage and DC leakage current test AJF-120/26 AC and DC voltage divider test voltage measurement A

20

2019-11

Undertake the installation (repair, test) power facility permit level five (10KV) test equipment

 Release time: 2019-11--20

Test equipment selection Equipment model specifications Equipment name Applicable test items 1 Intelligent dual display insulation resistance tester Insulation resistance measurement transformer winding insulation resistance and absorption ratio measurement AJ2000 5000V/200G2 test transformer withstand voltage test YD-10/503 DC resistance tester Transformer winding DC resistance measurement AJZC-10A4 ground resistance tester ground resistance measurement BY25715 DC high voltage generator DC withstand voltage and DC leakage measurement arrester DC reference voltage and DC leakage current test AJF-60/26 AC and DC voltage divider test voltage measurement

20

2019-11

AC high voltage oil test of high voltage test transformer

 Release time: 2019-11--20

　　The high-voltage test transformer adopts a voltage output that is manually raised by an autotransformer with a knob. The device is provided with a primary circuit that indicates the output voltage even after breakdown, and includes a fast trip circuit, zero start end lock, cage door interlock and a voltmeter for safe operation.

20

2019-11

How to do AC withstand voltage test for cables?

 Release time: 2019-11--20

　　Due to the large capacity of the cable, the use of traditional power frequency test transformers is bulky, bulky, and high-current working power is not easy to obtain on site. Therefore, series resonance AC withstand voltage test '>AC withstand voltage test equipment is generally used. The input power capacity can be significantly reduced, the weight is reduced, and it is easy to use and transport. In the early stage, the modulated series resonance equipment （50Hz） was mostly used, but there were disadvantages such as poor automation and high noise. Therefore, most of them now use frequency modulation （30-300Hz） series resonance test equipment, which can obtain higher quality （Q value）, and has automatic tuning, multiple protections, and low-noise, flexible combination methods （single piece weight is large Down） and other advantages. Based on the relevant technical data at home and abroad, choosing the appropriate test frequency range is a relatively important issue. In this regard, there are some different views and formulations. In terms of the current domestic and foreign formulations, we can conclude that it can be divided into 3 categories: the first category is a wide frequency range of 30-300Hz, 20-300Hz, 1-300Hz; the second category is the power frequency range, 45-65Hz, 45-55Hz; The third category is close to power frequency, 35-75Hz.

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