G - Physics – 01 – R
Patent
G - Physics
01
R
348/13, 324/35
G01R 19/165 (2006.01) H02H 3/20 (2006.01) H02H 3/253 (2006.01) H02H 3/34 (2006.01)
Patent
CA 1131312
ABSTRACT OF THE DISCLOSURE A voltage-unbalance detector for electrical systems, especially usable with switchgear in polyphase electrical systems and which responds to phase-to-ground over and under- voltages on one or more phases of the polyphase electrical system, as well as to improper phase orientations among the voltages on the phases of the system. The detector includes sensors for providing a first time-varying output signal which is proportional to the phase-to-ground voltage on each phase of the system. The first output signal is vectorially summed by a summer which provides a second time-varying output signal. The peak value of the second output signal varies according to variations in the phase orientation and magnitude of the phase-to-ground voltages on each phase of the system. A comparator compares the second output signal to a reference signal and provides an error signal if, and as long as, the phase-to-ground voltage variations exceed predetermined limits. A timer is responsive to the error signal for providing a third output signal a predetermined time after initiation of the error signal, but only if the error signal persists for such predetermined time. The third output signal is effective to initiate operation of the switch operator to open the switches.
338501
Osler Hoskin & Harcourt Llp
S&c Electric Company
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