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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)