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DC high voltage generator test method

time:2020/9/21   source:华天电力  reading:242 time

In the daily work process, power workers often need to use DC high-voltage generators. This equipment is very popular among electric power workers because of its more functions and more convenient use. So what are the basic test methods for DC high voltage generators?


In general measurement, when the connection is completed, first hang up the line connecting the sample. When the test voltage rises to the test voltage, read the corona and stray current I. Then when the test voltage is connected to the test voltage, read the total current i. The leakage current of the sample is Io=I1-I’


DC Hipot Tester.png


When it is necessary to accurately measure the leakage current of the test article, the high-voltage micro-ammeter should be connected to the high-voltage side, and the micro-ammeter must have a metal shield. The shield wire should be connected to the test object, and the shield of the high-voltage lead should be tightly connected with the shield at the end of the instrument. If you want to exclude the surface contamination of the test object from the leakage current on the surface of the test object. Then the high-potential end of the test object is closely connected with the high-voltage lead shield via several turns of bare metal wires.


In the case of zinc oxide, the detachable ground terminal of the magnetic blow arrester sample can also be used at the bottom of the sample (grounded side) with the ammeter measurement mode series. When the surface of the sample is used to exclude the leakage effect, the upper and lower ends of the surrounding ground The bare copper wire of the shielded soft sample loop of the shielded wire is coupled,


For small capacitance test products such as zinc oxide arresters, the discharge time is very fast through piezoelectric resistance measurement. For large-capacity cable tests, the test voltage should be discharged from the test voltage to less than 20% of the test voltage, and then discharged through the matching discharge rod. Hook up the ground wire after it is completely discharged, and then remove and replace the high-voltage lead.


The operation after the protection action found that the green light was on, the red light was on, and the voltage dropped during use, which is a related protection action. The power switch should be off, and the panel indicator should be off. Return the potentiometer to the zero position. After the low-voltage capacitor is fully discharged after one minute of standby, it is allowed to turn on the power switch again, and perform the no-load test again. If the situation is found, perform the boost test again.


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