Solid-state trip device comprising a zero sequence current detec

Details Solid-state trip device comprising a zero sequence current detec Solid-state trip device comprising a zero sequence current detec

1988-03-01

1990-02-06

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 48, 361 85, 361 97, H02H 326

Patent

active

048992461

ABSTRACT:
A signal representative of the zero sequence current is obtained from current transformers associated with each phase and with the neutral if applicable by separate summing, in two distinct conductors, of the positive half-wave currents and of the absolute value of the negative half-wave currents produced by the set of current transformers, the difference between the currents flowing through these two conductors being representative of the zero sequence current.

REFERENCES:
patent: 4131929 (1978-12-01), Moran
patent: 4347540 (1982-08-01), Gary et al.

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