Ensure the safety of personnel and equipment, The engineers should use the VLF tester properly and get correct test results.
Regarding the test procedures, we need to follow the steps below.
1. Preparations: Ensure that the device is powered off and grounded safely, and select an appropriate test voltage and frequency.
2. Apply voltage: Gradually increase the ultra-low frequency voltage to a preset value and maintain it for a certain time.
3. Monitoring results: By analyzing the current, voltage waveform, or partial discharge signal, determine the insulation state.
Please pay attention to the following.
The test voltage should be properly selected according to the rated voltage and insulation level of the device to avoid overvoltage damage.
Safety operation procedures should be strictly observed during testing to prevent electric shock or equipment damage.
The difference on comparison with other test methods;
Compared with DC high voltage test: VLF test can better simulate the actual operating conditions and avoid the insulation damage that may be caused by DC test.
Compared to power frequency testing, VLF testing is more suitable for field operation and requires less equipment.
As an advanced insulation detection technology, VLF testing is of great value in the maintenance and fault prevention of power equipment. By regularly implementing VLF testing, equipment life can be effectively extended and operational risks reduced.