Current transformer protection device

Details Current transformer protection device Current transformer protection device

1983-06-30

1985-06-04

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

315 74, 315 75, 315125, 361 56, 361 91, H02H 704

Patent

active

045218226

ABSTRACT:
A protection system for protecting the secondary windings of current transformers against overvoltages. The protection system consists of a device shunting the secondary winding and having a triggering device operative when the winding is subjected to a voltage higher than the voltage appearing across the terminals of the secondary winding, under normal operating conditions and during a fault on the HV power network. The shunting device comprises a latching relay incorporating a coil which is energized by the triggering device to short-circuit the current secondary transformer through the relay contact, and, also, a voltage regulator connected in parallel with the relay coil. This protection system is simple, compact, lightweight and consumes no energy when the current transformer operates under normal conditions.

REFERENCES:
patent: 2305096 (1942-12-01), McDermott

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