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This test (often called the dielectric voltage withstand) determines the dielectric integrity of the cable insulation. Dielectric integrity is determined by placing the wire/cable in a water bath. An AC voltage potential is applied across the insulation between a wire/cable conductor and the ground. This test is typically run as part of posttest assessment procedures to evaluate the sample’s insulation/jacket integrity after an environmental or other type of test.
The benefits of performing this test include:
- Determine if there are any imperfections in the sample insulation/jacket and the voltage at which there was insulation breakdown.
- Identify if the sample can withstand the specified voltage.
- Provide information to support a voltage rating (a common method for defining voltage rating is to divide the dielectric voltage withstand test value by two, then subtract 500 (e.g. (0.5 * 2.5kV) – 500V = 750V, where 2.5kV is the dielectric voltage withstand test value).
Lectromec currently has the capability to test up to 15.0kVAC.
Our Process
Perform visual examination of wire and record defects.
Strip the ends of the sample.
Coil sample and place in the water bath with ends above the water line.
Wait the specified duration.
Connect sample to high voltage test system and place electrode in the bath.
Apply power and slowly raise voltage to specified voltage.
Wait the specified duration.
If insulation breakdown occurs, record maximum achieved voltage. If no failure, then record leakage current.
Slowly lower applied voltage.
Report results.