Preventive testing is to find hidden dangers of equipment in operation, prevent accidents or equipment damage, check, test or monitor equipment, and also include tests on oil or gas samples.
The routine tests to be done in the preventive test of the high-voltage distribution room are:
1. Insulation test of electrical equipment, specifically:
1. Insulation resistance
2. Measure the dielectric loss factor tgδ
3. DC withstand voltage test and measurement of leakage current
4. AC withstand voltage test (power frequency 50hz, variable frequency 30-300hz, 0.1hz ultra-low frequency),
5. Induction withstand voltage test (power frequency 50hz, multi-frequency 50-150-300hz test equipment: multi-frequency induction withstand voltage test device
2. Characteristics/Characteristics Test of Electrical Equipment
Voltage ratio, current ratio, volt-ampere characteristics, time speed, DC resistance value, grounding resistance value, capacitance value, inductance value, etc.
Characteristic tests are classified from the test article. Common preventive tests are:
1. Transformer characteristic test (voltage ratio, current ratio, volt-ampere characteristics, time speed, etc.)
2. Generator characteristic test (DC resistance value, grounding resistance value, rotor impedance, etc.)
3. Transformer characteristic test (voltage ratio, current ratio, volt-ampere characteristics, time speed, etc.)
4. Lightning arrester characteristic test (leakage current, etc.)
5. Transmission line characteristic parameter test (line power frequency parameter test test, etc.)
6. Capacitor current test of distribution network (neutral point capacitor current test, etc.)
7. Cable fault detection test (8-pulse cable fault detection, etc.)