Protective Circuit for a Current Transformer and Current Transformer with a Protection Circuit

摘要

A protective circuit for a current transformer for preventing a secondary voltage on a secondary circuit of the current transformer from exceeding a secondary voltage threshold. A protective circuit input can be coupled to the secondary circuit of the current transformer such that the secondary voltage is applied to the protective circuit input. A control unit is connected to the protective circuit input. A switch unit is connected to the protective circuit input and is operatively connected to the control unit. The control unit is adapted to provide a control signal to the switch unit in response to the secondary voltage exceeding the secondary voltage threshold. The switch unit is adapted to short-circuit the protective circuit input in response to the control signal provided by the control unit. The switch unit is implemented as a semiconductor circuit.

主权项

1. A protective circuit for a current transformer for preventing a secondary voltage on a secondary circuit of the current transformer from exceeding a secondary voltage threshold, comprising:
a protective circuit input which can be coupled to the secondary circuit of the current transformer such that the secondary voltage is applied to the protective circuit input; a control unit connected to the protective circuit input; and a switch unit connected to the protective circuit input and operatively connected to the control unit;wherein
the control unit is adapted to provide a control signal to the switch unit in response to the secondary voltage exceeding the secondary voltage threshold; the switch unit is adapted to short-circuit the protective circuit input in response to the control signal supplied from the control unit; and the switch unit is implemented as a semiconductor circuit.