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The impulse dielectric tests can be thought of a production line means of checking for insulation/jacket breaches in wires/cables.
In this test, a voltage is placed on the specimen and the specimen is pulled under a ‘chain mail’ curtain connected to ground. The test is performed at a higher voltage than the standard dielectric tests performed on wires/cables, but this is necessary given the short duration of the voltage differential across the insulation/jacket. Further, since the voltage application is so short, the electrical degradation of the insulation is negligible.Parameters that can be changed for this test:
- Voltage
- Duration of voltage exposure (pull through speed)
Our Process
Perform a visual examination of the specimen. Record any observed defects.
Strip the insulation/jacket from the specimen and connect the line-side of the high voltage power supply.
Turn on the power supply and slowly increase the voltage to the specified voltage (when testing cable jackets, the specified voltage is typically less than for individual wires.
Pull the specimen through the electrically grounded metal curtain. Record if any breaches in the insulation/jacket are detected.
Report the voltage used, the specimen length, high voltage exposure duration, and humidity.