Common suspension multi-line grounding protective relay

Details Common suspension multi-line grounding protective relay Common suspension multi-line grounding protective relay

1980-05-23

1982-08-03

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324 52, H02H 316

Patent

active

043430279

ABSTRACT:
The present invention discloses a grounding protective relay which compensates for zero phase circulation current between lines and zero phase vertical voltage drops generated by induction in a common suspension multiline system. The grounding protective relay comprises, substantially, a current detector which detects the inter-line differential currents, a filter which eliminates the positive phase component from the inter-line differential current of each pair of phases, calculating sections calculate the zero phase component, the ratio of the magnitudes and the phase difference, an grounded phase detector, and a selection section which selects, according to the phase which is grounded, a deriveration result from a calculating section, characterized in that, when a grounded fault occurs, the zero phase circulation current is selected and is compensated.

REFERENCES:
patent: 3984737 (1976-10-01), Okamura et al.
"Protective Relaying for Systems Bearing Zero-Phase-Sequence Circulating Current" Suzuki et al. 1972.
"Digital Processors for Substation Switching and Control"-Horne et al., 1975 Conference Developments in Power System Protection 11-13 Mar. 1975 London England pp. 237-243.

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