• Terms and definitions
  • Voltage transformers: An instrument transformer in which the secondary voltage, under normal operating conditions is proportional to the primary voltage and differ in phase from it by an angle which is approximately zero for an appropriate direction of the connections.
  • Measuring Voltage transformer: A voltage transformer intended to supply indicating instruments, integrating meters and similar apparatus.
  • Protective Voltage transformer: A voltage transformer intended to supply electrical protective relays.
  • Accuracy class: A designation assigned to a voltage transformer errors which remain within specified limits under prescribed operating conditions.
  • Rated output: The value of the apparent power ( V A at a specified power-factor) which the transformer is intended to supply to the secondary circuit at the rated secondary voltage and with rated burden connected to its.