Motor Starting Transformer Characteristics
Motor starting transformers are auto transformers with tappings in the range of 50% to 70% of rated voltage (customer specified). The motor to be started is switched through the auto transformer in such a way as to start the motor at a lower voltage to minimise starting load and the associated supply voltage drop. This method is often referred to as the “Korndorfer Starter” method.
Information Required with Enquiry:
- Voltages (at no-load)
- Voltage tapping range.
- Number of phases (normally 3)
- Operating frequency
- Motor rating
- Motor locked-rotor current
- Motor start duration (seconds)
- Number of starts per hour
- Ambient conditions
- Design standard
- Enclosure protection rating
- Temperature sensing equipment
- Current sensing equipment (CT’s).