LARGE CURRENT RECTIFIERS:SCOPE
Diode & Fuse Mounting
The rectifier unit basically consists of regulating transformer, one or two rectifier transformer having configration of double star with IPT or 3 Phase bridge connection, transductors having variable voltage characteristic and one or two rectifier cubicle.
The voltage range required for starting and controlling the output of the process is obtained with the help of transductor in conjunction with an onload tap changer mounted on regulating transformer.
The large current in rectifier equipment is achieved by high power silicon diodes connected in parallel on a heat sink for each phase.
The heat sinks are either forced air cooled or forced demineralised water cooled depending upon rating and application.
The water cooled rectifiers are compact and the compactness of equipment is achieved by mounting the silicon diodes on hollow heat sink cooled by circulating water. The thermal impedance of the heat sinks is improved about 20 times as compared to air cooling .
The forced air cooled designed have been basically developed for large voltage and large current application where water cooling cannot be adopted due to restriction of DM water property.
