Protective relay-based monitoring system of DC power within an e

Details Protective relay-based monitoring system of DC power within an e Protective relay-based monitoring system of DC power within an e

1998-10-08

2000-07-04

Jackson, Stephen W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 86, 361115, H02H 300

Patent

active

060847557

ABSTRACT:
A DC monitoring system is provided in each protective relay in an electric power substation to detect DC grounds on the DC supply system. The DC monitoring system includes a first portion which indicates the presence of a DC ground. In a second portion of the system, the voltages at the contact inputs of the relay are recognized and compared against a standard voltage value range. An indication is provided when the recognized voltage is within said range. The combination of the indications from the first and second portions is useful in determining the location of DC grounds in the substation DC supply system.

REFERENCES:
patent: 3801898 (1974-04-01), Young
"DC Distribution System" By F.L. Brennan 1980 vol. 9, Electric Power Research Institute.

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