Rectifier Transformer Characteristics
Transformers for 12 pulse and 24 pulse rectifiers. Star/Delta, interconnected star (zigzag) and polygon connections. Close coupling between secondaries is normal, loose coupling is also available. For 24 pulse systems, the interphase transformer can be designed and installed in the tank along with the two transformers. Secondary terminations can be arranged to align with rectifier connections. Duty cycle derating is available.
TMC oil cooled transformers can be supplied with fans and pumps to increase the rated capacity (kVA). Forced directed oil circulation and/or forced air cooling of radiators permits a continuous power increase of up to 25% above the rated capacity. Fans can be used to economically provide extra capacity for overload conditions such as cyclic load peaks and traction loads.
Information Required with Enquiry:
- Rated power
- Voltages (at no-load)
- Voltage tapping range.
- Overload conditions
- Natural or fan cooling
- Number of phases
- Operating frequency
- Connection symbol (vector group)
- Rectifier transformer connection type to AS1955.
- Ambient conditions
- Design standard
- Enclosure protection rating
- Temperature sensing equipment
- Current sensing equipment (CT’s).