Watson L Courtney

US Patent:

42480540, Feb 3, 1981

Filed:

Feb 14, 1979

Appl. No.:

6/011987

Inventors:

Thomas E. Watson - Staunton VA
Watson L. Courtney - Staunton VA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

F04B 4106
F25B 700

US Classification:

62175

Abstract:

An improved load balancing control circuit for at least three electric motor-driven centrifugal refrigerant compressors comprises a current transformer secondary 90', 91', 92' and a respective load resistor 93', 95', 97' in series to form the legs of a circuit in which the legs are connected in a delta, each leg having a shorting switch 110', 111', 112' connected across it, and a balancing resistance network including balancing resistors 94', 96', 98' are connected in a wye circuit with the delta circuit.