AC Withstand Voltage Test DeviceAC Withstand Voltage Test Device
Notes:
Three types of sounds
During the withstand voltage test, due to electrical distance, there will be three types of sounds
"Crackling crackling": the sound of air ionization
"Zi, zi": the sound of air streamer
"Bang": loud and crisp, accompanied by sparks, the sound of insulation (or air) breakdown
Generally, air discharge is divided into three stages. The first stage is ionization. If the electric field is larger, it enters the streamer stage. If it is even larger, the air will be broken down.
If it is just a sound like frying beans, "crackling crackling", and it can withstand for one minute without breakdown, it is in principle in compliance with national standards.
If there is a "zi zi" sound, but it also withstands for one minute without breakdown, it is actually also in compliance with national standards, but the risk of long-term operation of the transformer with streamer is relatively high.
The main reason for high withstand voltage noise is that the air distance of the main air duct (between high-voltage coil and low-voltage coil) is insufficient.
Usage method:
(1) Before the test, the "┻" terminal of the high-voltage test transformer shell,
and the grounding terminal "┻" of the power control box must be well grounded, otherwise it will endanger the safety of personnel and equipment.
(2) Before operation, you must be familiar with the electrical principle wiring diagram of the high-voltage test transformer and the power control box. If you need to do DC withstand voltage and leakage test, 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, then 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 voltmeter indication and the condition of the test object, until the required test high voltage is adjusted.
[Schematic diagram of high voltage test] Schematic diagram of high voltage test
(5) To test the withstand voltage test time of the product, you can set the timer to the required time and then press the timer, that is, test the product withstand voltage within the specified time, and then alarm to inform. If the tested product is broken down, the overcurrent relay will automatically trip, and the test product is unqualified at this time.
(6) If you need to protect the tested product from breakdown, you can continuously connect a protective ball gap on the high-voltage side and adjust the discharge voltage of the protective ball to about 1.15 times the test voltage.
3KVA5KVA50KV AC Withstand Voltage Test Device
