INDUCED TRANSIENTS IN SUBSTATION CABLES - MEASUREMENTS AND MODELS

An extensive set of switching transient EMI response measurements on s everal types of substation cables and internal cable wires is describe d in this paper. Measured and predicted cable/wire current and voltage transients at both air-insulated substations (AIS) and gas-insulated substations (GIS) are presented, for system voltages ranging from 115 kV to 500 kV. The maximum peak-to-peak amplitudes of measured wire tra nsients are found to vary from around 1 A to almost 20 A (current in a mperes), and from 0.3 kV to almost 7 kV (voltage in kilovolts). Predic tive models for field-driven coupling, as well as for direct-driven co upling via current transformers or capacitively-coupled voltage transf ormers (CT's/CCVT's), are presented. Model predictions are compared to and validated against measured wire transients.