Protection of polyphase equipment

Details Protection of polyphase equipment Protection of polyphase equipment

1975-05-22

1977-05-17

Moose, Harry

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

361 31, H02H 3341

Patent

active

040244393

ABSTRACT:
Motor protector apparatus for independently sensing the respective positive, negative, and zero sequence currents flowing in the supply lines to a three phase motor for interrupting power to the motor whenever such positive, negative, or zero sequence components reach levels indicative of abnormal operating conditions. The protector network includes bridge means for segregating the negative and positive sequence components, indicators for visually displaying the source of the abnormality, and means for restoring power to the motor after a defined time period.

REFERENCES:
patent: 2296784 (1942-09-01), Harder
patent: 3209204 (1965-09-01), Rockefeller
patent: 3462646 (1969-08-01), Bell

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