Apparatus for monitoring grounded states of multiple DC loads of

Details Apparatus for monitoring grounded states of multiple DC loads of Apparatus for monitoring grounded states of multiple DC loads of

1993-08-19

1995-06-20

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 46, 361 47, H02H 316

Patent

active

054265533

ABSTRACT:
An apparatus for monitoring grounded states of multiple DC loads of a relay system, comprising a power supply circuit for inputting a commercial AC power and supplying DC voltages necessary to the DC loads and (+) and (-) DC circuit lines to which the DC loads connected, a low frequency signal generating circuit for transmitting a low frequency AC signal over the (+) and (-) DC circuit lines, the low frequency AC signal having the range of having no effect on different components, main (-) and (+) grounded state detecting circuits for detecting (-) and (+) grounded states of the whole of the (+) and (-) DC circuit lines and the DC loads, respectively, an overvoltage detecting circuit for detecting an overvoltage at an input stage of the apparatus to protect the apparatus from the overvoltage, a grounding current detecting circuit for detecting individually the low frequency AC signals from the DC loads when the DC loads are grounded, and a load fault signal generating circuit for generating load fault signals in response to grounding current signals from the grounding current detecting circuit. Therefore, a faulty state of the whole or each of the DC loads can readily be monitored through each lamp by detecting the low frequency AC signals leaked from the multiple DC loads due to the grounding.

REFERENCES:
patent: 3783340 (1974-01-01), Becker
patent: 4159499 (1979-06-01), Beveakin
patent: 4280162 (1981-07-01), Tanka et al.
patent: 4912588 (1990-03-01), Thomi et al.
"DC Ground Relay Specification", Sun Kwang Electric Co., Ltd., Korea along with an English-language translation.

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