Title:
【発明の名称】中性点もしくは接地喪失保護回路
Document Type and Number:
Japanese Patent JPH05501043
Kind Code:
A
Abstract:
A loss of neutral or ground protection circuit is disclosed which uses a simple capacitive circuit which discharges through the neutral or ground leads in normal conditions, and in the event of loss of neutral or ground charges sufficiently to trip a circuit breaker. The protection circuit may include other circuits such as ground fault detection circuits and may be in a one or three phase system. By virtue of the fact that a capacitive circuit is used to trip the circuit breaker, an inherent time delay is involved and thus the circuit breaker will not be tripped as a result of a momentary loss of neutral or ground. This is particularly important where continuity of operation of a load is important.
Inventors:
Glennon, Oliver
Gilstra, Henry, Jay.
Gilstra, Henry, Jay.
Application Number:
JP50757590A
Publication Date:
February 25, 1993
Filing Date:
May 04, 1990
Export Citation:
Assignee:
Square D Company
International Classes:
H02H3/14; H02H3/16; H02H3/34; H02H5/10; (IPC1-7): H02H3/14; H02H3/16; H02H3/34
Attorney, Agent or Firm:
Akira Asamura (3 outside)