What is the internal condition of your Electric Motors?
What about the conductors feeding your motors power?

 
 
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Motor Circuit Analysis

Motor Circuit Analysis utilized computer driven analytical equipment to collect electrical data on your electric motors and motor power feed systems to determine the overall condition of the motor. Using sound electrical principles, ISI’s engineers and analyst are able to evaluate the electrical health of your motors and provide recommendations for corrective actions in a controlled schedule instead of at 3:00am.

MotorISI’s engineers and analyst rely on basis engineering principles to monitor the motor condition; based on this data they will develop action plans to maximize the runtime and availability of the motor system. These principles include:

  • Resistance Phase to Phase: Taking micro-ohm level readings between each set of phases allows the analyst to evaluate the condition of the electrical connections in the circuit. A high resistance reading or imbalance between the phases will indicate a connection problem.
  • Resistance to Ground: Commonly referred to as a megger test, ISI’s test equipment energizes the circuit using 500VDC or 1000VDC based on the size of the motor. The results of the data are logged and compared against previous results, similar motor results, and IEEE standards. This data is used to evaluate the electrical insulation condition of the motor and power circuit.
  • Capacitance to Ground: The overall capacitance data allows the analyst to evaluate the presence of moisture or contaminate buildup in the motor. An increasing trend in capacitance level will indicate there are increasing levels of moisture or contaminate buildup on the windings and the motor should be service to avoid deterioration of the insulation.
  • Inductance Phase to Phase: The measurement of inductance between phases gives the analyst the ability to evaluate the condition of the windings and the insulation condition within the coils. A significant imbalance and/or increasing gradients between phase readings are an indication of internal shorting of the coils. Advanced notice and maintenance will significantly increase the life and availability of your motors.

Additional testing can be performed as needed for acceptance testing and troubleshooting tools, including Polarization Index (PI), Dielectric Absorption Ratio (DAR), Rotor Influence Check (RIC), as well as, fault isolation testing.

 
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