Earth contact monitoring device for a polyphase three-phase filt

Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection

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361 47, 361113, H02H 316

Patent

active

044293380

ABSTRACT:
A monitoring system for detecting earth contact of at least one phase of a polyphase network. Each of the phases in the network is connected by a capacitive-inductive filter to a neutral node which is connected to earth. In one embodiment of the invention, the current flowing from the neutral node to earth is detected by an induction current transformer which provides a signal responsive to said earth current. The output signal of the induction current transformer is conducted through at least one low pass filter for suppressing harmonics, and rectified to produce a direct current voltage signal, the amplitude of which is proportional to the amplitude of the fundamental frequency component of said signal. A fault indicating signal is produced when the direct voltage signal exceeds a predetermined value.

REFERENCES:
patent: 1539834 (1925-06-01), Gaarz
patent: 1988121 (1935-01-01), Hillebrand
patent: 2535064 (1950-12-01), Harrison
patent: 3286129 (1966-11-01), Gagniere
patent: 3515943 (1970-06-01), Warrington
patent: 4099215 (1978-07-01), Parrier et al.

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