Three-phase time overcurrent detector

Details Three-phase time overcurrent detector Three-phase time overcurrent detector

1979-09-21

1981-12-08

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, H02H 3093

Patent

active

043051081

ABSTRACT:
A polyphase time overcurrent detector provides a variably delayed control signal wherein the delay is inversely related to both the current magnitude and the number of faulted phases. Current transducers produce input signals representative of the current flowing in each phase of the polyphase system. The input signals are added together to produce a charging signal. If at the end of a predetermined time period the fault has not been cleared, the charging signal will begin to charge a capacitor. If the capacitor charges to a predetermined voltage level within a fixed time period, the control signal is initiated.

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patent: 3777215 (1973-12-01), D'Esopo
patent: 4000446 (1976-12-01), Vandevier et al.

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