Microprocessor based motor protective relay with half wave sampl

Details Microprocessor based motor protective relay with half wave sampl Microprocessor based motor protective relay with half wave sampl

1987-03-31

1988-07-12

Shoop, Jr., William M.

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318807, 318798, 318806, 361 24, G05B 500

Patent

active

047572426

ABSTRACT:
A motor protection relay is taught which determines effective and RMS values of current on a cycle-by-cycle basis by measuring three-phase currents at 10.degree. intervals in a line cycle and then determining the positive and negative sequence components thereof by storing the accumulated information in a memory. In order to increase the dynamic range of the sensing apparatus, only the negative half wave of each current is sensed and the positive half wave is reconstructed by finding the 180.degree. phase shifted equivalent thereof in the negative half wave.

REFERENCES:
patent: 4434390 (1984-02-01), Elms
patent: 4467260 (1984-08-01), Mallick et al.

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