Method and apparatus for detecting surge in centrifugal compress

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

1984-12-24

1986-04-15

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62129, 415 17, F25B 100

Patent

active

045819009

ABSTRACT:
A surge detection apparatus for use in a refrigeration system having a centrifugal compressor driven by an electric motor includes a first pressure transducer for sensing a condenser pressure and a second pressure transducer for sensing an evaporator pressure. A first bandpass digital filter 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 is used to sense a current in the electric motor driving the compressor. A second bandpass digital filter 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 responsive to the first through fourth signals indicates when a valid surge is occurring in the compressor.

REFERENCES:
patent: 3963367 (1976-06-01), Stalker et al.
patent: 4164033 (1979-08-01), Glennon et al.
patent: 4177649 (1979-12-01), Venema
patent: 4259845 (1981-04-01), Norbeck
patent: 4282718 (1981-08-01), Kountz et al.

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