Safety Tester Notes

The safety tester measures the voltage resistance of high-voltage elements and devices (using AC/DC withstand voltage meters). Such as silicon heap. It should be noted that the DC high voltage output is negative and the ground is positive. When testing the capacitor, there is a charging process when a voltage is applied across the capacitor. At this time, there is a charging current in the test circuit. When the current is greater than the set leakage current value, the withstanding voltage tester will alarm, causing the test to be interrupted. Can not be carried out. Therefore, when the safety tester is testing, it should slowly increase the voltage, and the charging current is less than the set leakage current value until the specified test voltage is tested. Can not be fixed voltage, reset - start the way to test. In the AC circuit, it is equivalent to the resistance in the DC circuit. Therefore, the safety tester generates a current in the AC circuit. When the current is greater than the set leakage current value, the Hipot tester will alarm, making the test. Interrupted, unable to proceed. Therefore, before the test, the capacitive reactance (Xc) of the capacitor should be calculated first, then the loop current value under the test voltage should be calculated, and then the preset value of the leakage current of the withstand voltage tester should be adjusted to make it slightly larger than the loop current value. carry out testing. J) Testing components such as cables that have large distributed capacitance (equipment) should be equivalent to capacitor testing.