Principle of the high-voltage test
- Test also known as dielectric test or breakdown test
- The objective is to detect insulation problems in the product being tested (poor insulation, damaged insulation, insufficient air gap, etc..)
- High voltage and fault current values defined in applicable standards (voltage of 2U+1000 in general and maximum fault current of 5mA to 30mA)
- High voltage can be either alternating or direct (values are adjusted accordingly).
- High voltage application possible with test guns depending on usage
- High voltage can be applied immediately at the start of the test, in two stages, or with a gradual increase.
- Depending on the required fault current, safety devices may be necessary (two-hand control, test cage, light curtains, etc..)
- Possibility of performing the High Voltage Test in superposition (hot high voltage)
- Mandatory if the product to be tested must be in operation to perform the high-voltage test (the product to be tested is powered at its rated voltage and high voltage is applied simultaneously).
- Depending on the products tested, it may be necessary to discharge the product (mandatory if the test is DC).