Arc fault detection system

Details Arc fault detection system Arc fault detection system

1997-10-15

1999-05-18

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 42, 361 78, 361115, H02H3/00

Patent

active

059056193

ABSTRACT:
An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard.

REFERENCES:
patent: 5224006 (1993-06-01), MacKenzie et al.
Type 87M Three Phase Percentage Differential Relay, ABB, Asea Brown Boveri, Bulletin 7/6/1-1D.

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