After completing a hipot test, it is crucial to follow proper procedures for discharging the equipment to ensure safety. Failing to discharge the equipment correctly can result in accidents, equipment damage, and even potential harm to individuals conducting the test.Here we learn how to do the discharge after highvoltage withstand test.
1. Preparation before doing discharge
Aftert the hipot test completed, it is necessary to ensure that the test sample is completely disconnected from power supply, and wait for a period of time for the charges on the test sample to undergo preliminary self-discharge through its own ground capacitance. At this time, the voltage value can be confirmed to gradually decrease to a lower level (usually around 5kV to 15kV). This can be done by observing the voltage meter on the control box. This will prevent any current from flowing through the device during the discharging process. Next, make sure that all cables and connections are disconnected from the equipment to isolate it from any power sources.
2. Doing discharge with a discharge rod
In hipot tests, it is recommended to use portable telescopic DC high-voltage discharge rods. These rods have the advantages of small size, light weight, flexible operation, and high safety and reliability. They are indispensable safety tools in high-voltage tests.
Only when the voltmeter indicates that the voltage has dropped below the safe range, can the DC high-voltage discharge rod be used to further discharge the test object.
3. Discharge for special test objects
For test samples such as high-capacity or long-distance high-voltage cables, the accumulated charge quantity is relatively large. The discharge time should be appropriately extended, and multiple repeated discharges may be necessary to ensure safety.