Monitoring a signal

Details Monitoring a signal Monitoring a signal

1978-03-13

1980-09-23

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 97, H02H 308

Patent

active

042246512

ABSTRACT:
A method of and a protection relay for protecting electrical equipment. The method includes dividing a predetermined 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 characteristic 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 characteristic 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.

REFERENCES:
patent: 3440491 (1969-04-01), Tenenbaum et al.
patent: 3609461 (1971-09-01), Obenhaus
patent: 3766436 (1973-10-01), Zocholl
patent: 3831061 (1974-08-01), Boyd
patent: 4012669 (1977-03-01), Gelfand et al.
"MJE 200 Series Linearized Current Monitor"-M. J. Electronics, Sep. 1976.

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