Superimposed impulse voltage test on 525 kV HVDC underground cable

One of the distinctive electrical tests for HVDC cables is the superimposed impulse voltage test. This paper investigates the development and validation of an Electromagnetic Transient (EMT) model for conducting this test on a 525 kV HVDC cable. The model incorporates the actual configuration and parameters of the high voltage (HV) laboratory test circuit. Given the technical challenges posed by the simultaneous application of DC and impulse voltages, the EMT model provides valuable insights into the test circuit’s behaviour. Validation with real HV laboratory measurements confirms the model’s accuracy and its potential to address these challenges.