High Voltage SCR Controlled Power Supply, 0 to 5000 VDC, 70 A Output

Product Overview

High voltage SCR controlled power supplies consist of a SCR controller on the 480 VAC three phase input power lines. The three phase power transformer is used to step up the secondary voltage so that after rectification the desired high voltage DC output is achieved. Each diode in the rectifier circuit consists of multiple diodes in series to increase the overall peak inverse voltage (PIV) of the diodes. The high voltage rectifier section is enclosed inside a fiberglass plenum to offer high voltage protection. Circuit breakers, fuses, voltmeters and ammeters can be added per customer requirements.

The block diagram of a high voltage SCR controlled power supply is shown below:

The photo of a 5000 VDC, 70 A output high voltage SCR assembly, part number 18278PS is shown below:

High Voltage SCR Power Supply

Specifications:

• High Voltage SCR Controlled Power Supply, P/N 18278PS 
• Power Rating: 350 KW. 
• Input: 480 VAC, 3 PH, 60 Hz 
• Output: 0 to 5000 VDC, 70 Amps max 
• Ripple: 2 % approximately at maximum rated voltage 
• Configuration: 12 pulse externally SCR controlled rectifier system 
• Protection Devices: input contactors, overload relay shutoff, input surge suppressor, thermal switches 
• Output current limiting resistor (made with 5 Ohm Kanthal heating element) 
• Emergency power shut off 
• Cooling: Each 6 pulse rectifier assembly is cooled by three 10” fans 
• Interface: 4/20 ma converter interface for output voltage and output current to SCR controller. 
• Enclosure: The overall dimension of the unit is (78”H x 38”W x 53”D). It is comprised of two separate enclosures each with dimensions of (78” H x 38” W x 26” D) which are integrated together to form a single enclosure. Each half enclosure has one 6 pulse transformer and one 6 pulse high voltage rectifier. 
• Weight: Approx. 5000 lbs. 
• SCR Controller: The 12 pulse SCR controller is supplied by the customer. We were responsible for the 12 pulses Transformer and 12 pulses Rectifier section. Portability: Unit can be lifted up with a fork lift. It can also be moved around with a 5000 lb pallet jack. 
• Transformer: Two 200 KVA transformers are used to step 480 VAC to 3750 VAC each in a 12 pulse configuration 
• Rectifiers: Two 6 pulse rectifier assemblies capable for 5000 VDC and 60 Amps output were used. The high voltage rectifier assemblies are isolated and protected in a fiberglass plenum within the enclosure. 
• Blocking Diode: Each diode of the 6 pulse rectifier consists of 10 diodes in series to offer a blocking voltage of 12000 V (PIV)

The details of the 12000 V (PIV) 6 pulse diode/rectifier assemblies are shown below:

CEHCO is a SCR controlled power supply manufacturer. To discuss your specific requirements, please contact us toll free at (800) 595-7096, or send us an email at info@cehco.com.