Protective relaying apparatus for electric power systems

Details Protective relaying apparatus for electric power systems Protective relaying apparatus for electric power systems

1976-08-26

1978-03-14

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 80, H02H 326

Patent

active

040794334

ABSTRACT:
A static circuit comprising an input transformation circuit responsive to current or voltage derived from an electric power system to be protected for producing a first pair of electric quantities having a phase difference of .theta. and a second pair of electric quantities dephased by .phi. from the first pair of electric quantities respectively, a pair of multipliers for the producing products of the first and second pair of electric quantities, and an adder or subtractor for producing the difference of these products.

REFERENCES:
patent: 2985801 (1961-05-01), Warrington
patent: 3048744 (1962-08-01), Warrington

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