Method and apparatus for detecting surge in centrifugal...

Details Method and apparatus for detecting surge in centrifugal... Method and apparatus for detecting surge in centrifugal...

F - Mech Eng,Light,Heat,Weapons

04

D

340/133, 354/28

F04D 27/02 (2006.01) F25B 1/053 (2006.01) F25B 49/00 (2006.01) H02H 3/44 (2006.01) H02H 7/085 (2006.01)

Patent

CA 1225716

METHOD AND APPARATUS FOR DETECTING SURGE IN CENTRIFUGAL COMPRESSORS DRIVEN BY ELECTRIC MOTORS ABSTRACT: A surge detection apparatus for use in a refri- geration system having a centrifugal compressor (12) driven by an electric motor (20) includes a first pressure transducer (2) for sensing a condenser pressure and a second pressure transducer (34) for sensing an evaporator pressure. A first bandpass digital filter (58) responsive to the condenser pressure and the evaporator pressure is provided for generating a first signal representative of the rate of change of the pressure developed across the compressor. A current transformer (24) is used to sense a current in the electric motor driving the compressor. A second bandpass digital filter (61) responsive to the motor current is provided for generating a second signal representative of the rate of change of the RMS current being drawn by the compressor drive motor. A third signal representative of a differential pressure threshold and a fourth signal representative of a first motor current threshold and a second motor current threshold are provided. A computing device (73) responsive to the first through fourth sig- nals indicates when a valid surge is occurring in the compressor.

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