Current Signature Test Finds Broken Rotor Bars in Air Separation Motor Company: Gas Separation Plant in Texas Machine Description: Motor, 4160V, 4000hp, rated speed of 1792rpm Current Signature Test Finds Broken Rotor Bars in Air Separation Motor A current signature test was performed with the tester only knowing the necessary motor nameplate parameters. The motor name-plate data included the rated hp, rated current, rated speed and also the main phase CT ratio was uploaded to the current signature instrument in approximately two minutes. The test was taken by clamping around the secondary side of a main CT with a 5A/1V current probe. Also keyed in was the number of rotor bars in the motor: in this case the motor had 155 rotor bars.Figure 1: Frequency Spectrum and Motor Data Current Signat

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