Electrical apparatus for detecting relationships in three phase

Details Electrical apparatus for detecting relationships in three phase Electrical apparatus for detecting relationships in three phase

1992-12-18

1994-03-29

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324108, 361 76, G01R 1914

Patent

active

052988538

ABSTRACT:
An electrical apparatus for visually indicating phase sequence, phase asymmetry and presence of three phases of an AC network comprising two transistors connected by their emitters to a first voltage terminal of the three phase network, the bases of the transistors being connected through diodes to a first voltage terminal and through crosscoupled phase shifting means to two other terminals of the three phase network. The collectors of the transistors are connected through resistors, light emitting diodes and diodes to two other voltage terminals and the emitters of the two transistors are connected through two other light emitting diodes to the first voltage terminal.

REFERENCES:
patent: 3431467 (1969-03-01), Calfee
patent: 3596137 (1971-07-01), Kirsch
patent: 3764904 (1973-10-01), Drexler
patent: 4495461 (1985-01-01), Gilliam
patent: 4885532 (1989-12-01), Macey

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