Multiphase undervoltage tripping circuitry for electrical power

Details Multiphase undervoltage tripping circuitry for electrical power Multiphase undervoltage tripping circuitry for electrical power

1979-06-01

1981-03-03

Salce, Patrick P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 59, 361 65, 361110, H02H 328

Patent

active

042544440

ABSTRACT:
Circuitry for generating tripping and blocking signals for the protection of electrical components included in electrical power supply networks as a result of the occurrence of faults therein provides multiphase pole tripping in the event that, after a single pole tripping has been executed, a new single phase fault occurs in any of the remaining phases of the electrical power supply network. Respective tripping and blocking signals are generated for each phase of the electrical power supply network in dependence on whether the fault lies ahead or behind the electrical component to be protected, respectively, in response to measurement of the voltae and current associated with transient waves generated by faults associated with each electrical power supply network phase. Multiphase pole tripping signals are generated by undervoltage detector logic circuitry responsive to the generation of the tripping signals upon the occurrence of a single phase fault, and the sensing of an undervoltage in another phase of the electrical power supply network before reclosing of the faulty phase.

REFERENCES:
patent: 3878460 (1975-04-01), Nimmersjo
patent: 3890544 (1975-06-01), Chamia
patent: 3938007 (1976-02-01), Boniger et al.
patent: 3940663 (1976-02-01), Meier et al.
patent: 3956671 (1976-05-01), Nimmersjo
patent: 4053816 (1977-10-01), Nimmersjo
patent: 4092691 (1978-05-01), Williams

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