Method of and a protection relay for protecting electrical...

Details Method of and a protection relay for protecting electrical... Method of and a protection relay for protecting electrical...

G - Physics

01

R

328/166, 328/188

G01R 19/165 (2006.01)

Patent

CA 1141830

ABSTRACT OF THE DISCLOSURE A method of and a protection relay for protecting electrical equipment. The method includes dividing a prede- termined dividend value by a signal corresponding to the load current in the equipment to provide a quotient signal, and then linearly integrating the quotient signal. When the integrated signal reaches a predetermined value, the equipment is tripped. This provides an overload vs tripping time charac- teristic which is substantially linear. The method further provides for sensing whether the equipment is operating in a start up mode or in a normal running mode, and then automatically to select a less sensitive overload vs tripping time charac- teristic when the equipment operates in the start up mode and automatically to switch to a more sensitive characteristic when the equipment reverts to its normal running mode.

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