Motor Protection

Motor Electrical Protection

• Thermal Overload

                   Process Caused (Excessive load)

                   High Ambient Conditions (Hot, Blocked Ventilation)

                   Power Supply Issues (Voltage/Current Unbalance, Harmonics)

•       Phase Fault

• Ground Fault

• Abnormal Operating Conditions

   Over & Under Voltage

   Under frequency

   Voltage and Current Unbalance

   Load Loss

   Jamming

   Jogging

Thermal over load protection

The tripping time is calculated according to a simple formula. Pre-stressing is not taken into account because currents are only recorded if they are greater than 1.1 times the set value.

Negative Sequence Protection

Short Circuit Protection

Testing

Current Signature Analysis

During this training following points needs to be covered for condition based-monitoring techniques:

Online Testing of HT Motors

1.Vibration Signature Analysis (VSA)

2.Motor Current Signature Analysis (MCSA)

3.Acoustic Emission Analysis (AEA)

Residual Life Assesment (RLA) / Life Expectancy Analysis of HT Motors

1.Polarization Depolarization Current Analysis

2.Non Linear Behavior Analysis

3.Partial Discharge Recording and Analysis

4.Winding Resistance Measurement.

5.Life Expectency Analysis