Standard testing procedures follow a rigorous sequence to ensure accurate and reliable results. First, the status of the cable must be verified-ensuring it is de-energized, fully discharged, and grounded-while ambient temperature and humidity are recorded. Depending on the specific test, samples are prepared or test circuits are connected, with careful attention paid to ensuring correct wiring and reliable grounding.
Before formal testing begins, key instruments must be calibrated or undergo a self-check. Taking AC withstand voltage and partial discharge (PD) tests as an example, the procedure is as follows: set up a series resonant circuit and connect the partial discharge coupling device; gradually increase the voltage to the specified pre-stress level and maintain it to measure the system's background noise; then, increase the voltage to the required test level, monitor and record the partial discharge magnitude over the specified duration, and observe for any signs of electrical breakdown. Once the test is complete, the voltage should be lowered gradually, followed by a thorough discharge of the equipment. Throughout the entire process, detailed records must be maintained regarding voltage, current, discharge magnitude, temperature, and any observed anomalies. All operations must strictly adhere to safety protocols for high-voltage work.
