SCR Division of BHEL, Bhopal has been supplying wide range of Large Current Rectifier Equipment since year 1969.

The large current rectifier equipment provides DC power for electrolytic process of electro-chemical, aluminum & graphite industries.  BHEL have so far supplied more than 60 units of about 16,00,000 Kilowatt rectifiers for caustic soda, aluminum smelter and graphite furnaces.

Some of the special features of the large Current Silicon Power Rectifier Equipment are listed below:

• Compact and Rugged design

• PLC controlled Rectifier (Hot standby option available)

• HMI for control, annunciation, status display

• Interface with customer SCADA possible

• Operates in both current and power control modes

• High Efficiency

• Accuracy of control + 1%

• Uniform current sharing

• Large safety margins in Design

• Easy maintenance and monitoring

• Single rectifier unit up to 60 KA

• Auto/Rectifier Transformer & IPT

• Transductors – housed in single tank

• Externally mounted on-load tap-changer

• Non magnetic aluminium rectifier structure

• FRP covers to avoid eddy current losses

• Steel shields

• Suitable for tropical conditions

• Choice of cooling

A rectifier equipment comprises an assembly of semiconductor diodes mounted on heat sinks along with series connected fuse and surge voltage protection components, all suitably enclosed and a separately mounted transformer. Additional items, such as interconnections, control cubicles, switchgear, AC/DC measuring system, AC/DC bus bars are included in scope of supply when required.

For large current applications above 25kA, important advantages are gained by mounting the rectifier assembly in close association with the transformer known as 'Rectiformer' by combining the two units into an integral equipment (a) The space requirement is considerably reduced (d) Both preparatory & erection work at site is minimized (c) AC. bus bars connections are reduced to minimum.