1) Before testing, the shell of the high voltage test transformer “ ┻ ” terminal,
and the grounding terminal “ ┻ ” of the power control box must be properly grounded, otherwise it will endanger personal safety and equipment safety.
(2) Before operation, you must be familiar with the electrical schematic wiring diagram of the high voltage test transformer and the power control box. If DC withstand voltage and leakage tests are to be performed, you can first screw the high-voltage silicon stack or microammeter onto the high-voltage terminal of the high-voltage test transformer.
(3) After preparation, check that the wiring is correct, then close the main power switch. At this time, the green switch indicator light is on, indicating that the power is connected; at the same time, the indicator light on the green stop button is also on. If it is not on, turn the voltage regulator handle counterclockwise back to zero, and the indicator light on the green stop button will be on, otherwise the start button will refuse to close.
(4) Press the start button, the red button indicator light is on. At this time, rotate the voltage regulator handle uniformly and slowly clockwise at a speed of 1.5 to 2 kV per second, the high voltage gradually rises, and pay close attention to the indication of the voltmeter and the condition of the test object, until the required test high voltage is adjusted.
Usage Instructions
1. Before performing the power frequency withstand voltage test, first connect the connection wires and then connect the power supply. The red zero position indicator light is on. Press the start button, the green indicator light is on, indicating that the test transformer has been connected to the control power supply. Press the boost button to start manual boosting. After boosting to the required rated test voltage, press the timing button. The time is generally 60 seconds, which can be set by yourself. Press the stop button, the high voltage and low voltage outputs stop, and reset the voltage regulator. Then cut off the power cord, and the test is completed.
2. Precautions during the power frequency withstand voltage test operation
1) Test personnel should divide responsibilities, set the safety distance of the test site, carefully check the grounding of the test object and the test transformer, and have dedicated personnel to monitor safety and observe the condition of the test object.
2) The main parts of the test object should be cleaned and kept absolutely dry to avoid damaging the test object and causing errors in test values.
3) For tests on large equipment, a no-load test of the test transformer should generally be performed first, that is, boosting to the test voltage without connecting the test object.
4) During the withstand voltage test, the boosting speed should not be too fast, and sudden pressurization should be prevented, such as suddenly closing the switch when the voltage regulator is not at zero position, and sudden power off should also be prevented. Generally, the switch should be opened after the voltage regulator is lowered to zero position.
5) During the boosting or withstand voltage test, if the following abnormal conditions are found, such as the voltage and current meter pointers swinging greatly, the test object making abnormal sounds, or insulation showing signs of burning or smoking, the voltage should be immediately reduced, the power cut off, the test stopped, and the cause investigated.
3. When using this product for high voltage tests, in addition to being familiar with this manual, you must also strictly implement relevant national standards and operating procedures.
