What are the methods of DC leakage current test?

1) according to the situation of the tested products, refer to the transfer test standard or preventive test procedure to determine the DC test voltage value. If the DC leakage current test is combined with the DC withstand voltage test, the DC test voltage should be used as the maximum test voltage.

2, according to the size of the test voltage, field equipment conditions, select the appropriate test equipment and wiring methods, draw the test wiring diagram.

3, first of all, combined with the site conditions, the reasonable arrangement of the test equipment, and then wiring. The arrangement of the principle should be safe and reliable, convenient operation, clear reading, high and low voltage wiring should have clear boundaries; a connection is completed, checked by another person, should be correct, select the appropriate range of instrument wiring, pressure regulator is zero, microammeters short-circuit switch should be closed.

4) before the formal trial, the maximum test voltage is divided into 4~5 segments, not connected with a specimen under the condition of piecewise boost "empty test" records of stray current flowing through the meter test voltage value. "Empty test", the end of the high pressure, open the power knife gate, and the filter capacitor discharge.

5) connect the test sample, according to fourth) the corresponding step voltage, step by step, and read the leakage current value. Every time after boosting the microammeter stable indicators then reads the leakage current value; finally rose to the highest value of the test voltage and duration according to the "standard" or "Regulations" required, read leakage current. The difference between the leakage current value and the leakage current value of the corresponding "empty test" is used as the leakage current value of the sample.

6) test is completed, the regulator returned to zero, cut off the power supply voltage regulator is used, and then discharge rod sample by the resistance will fully discharge, discharge time shall not be less than 2min. According to the size of the spark discharge, the insulation condition can be understood.

7) record the test data.