These laboratory rectifiers are mainly used in electrical engineering laboratories for the purpose of conducting experiments in machines and DC circuits. This is servo controlled to provide constant DC output. This provides 100A output for continuous operation. This rectifier provides suitable source for operating DC machines. System Description: This rectifier works with 3 phase 415V AC as its mains supply voltage. The ripple factor is less than 5% at its peak load. The DC output from this unit is continuously variable by a potentiometer, in the range of 200 to 240 DC. A servo control motor circuit ensures constant DC output voltage. A digital voltmeter and Suitable HRC fuses are provided at AC input and DC output stages for protection. The rating of the mains transformer is designed to provide upto 200V DC, while the series transformer provides 40V DC, suitably arranged to provide the correction required. The series transformer is controlled by a three phase motorized dimmerstat. The rectifier circuit is generously rated with suitable heat sink and hole storage suppression. This unit has a START and STOP push buttons. Pressing Start push button makes, the output to set at the voltage shown by the panel meter, and the output is available at the terminals at this time. Pressing stop push button, the output is reset to 0V. In the event of mains power failure or accidental break in the mains supply, the DC supply from this rectifier unit, is automatically disconnected. The output from this rectifier is available to the DC circuit, only when the mains power returns AND start push button is pressed. This facility provides the scope for investigating the reason for the failure, and also protecting the assets. The entire rectifier unit is assembled in a rugged sheet steel material with suitable reinforcements wherever required. The entire unit is assembled on suitable caster wheels, to provide mobility for unit. |
