Methods and apparatuses for detecting surge in centrifugal compr

Details Methods and apparatuses for detecting surge in centrifugal compr Methods and apparatuses for detecting surge in centrifugal compr

1997-12-11

1999-04-20

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62129, F25B 4902

Patent

active

058947361

ABSTRACT:
A surge detection system for use in a fluid system having a load driven by a centrifugal compressor, the compressor being driven by an electric motor. The surge detection system comprises a means for sensing a differential pressure developed across the compressor and a means for sensing a current representing input power to the motor. The surge detection system further comprises a first computing means responsive to the differential pressure developed across the compressor for indicating when a valid surge is occurring in the compressor, and a second computing means responsive to the variable speed drive current for indicating when a valid surge is occurring in the compressor.

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