Charging and power supply units.  Design

▲ Charging and power supply units in metro traction substation

Design of CPSU represents a cabinet made of sheet steel with two-sided maintenance, with protection level no less than IP 43. 

On the cabinet front door there are control units including control terminal, measuring units and alarm lamps. Power modules cooling is natural air. 

Power reducing transformer is installed inside cabinet. Smoothing filter is installed in CPSU output. External connections cables input is made through holes in cabinet floor by compacted sealed inputs.

Modes of operation

Operation mode of CPSU concerning output parameters value is set by switch "Operation mode” installed on the cabinet door. It is possible to set two operation modes of CPSU:

• «Additional charge»; 
• «Recharge». 

Voltage setting can be adjusted in the range of 0.7 to 1.3 of rated output voltage of this mode.

Load current setting can be adjusted in the range of 0.05 to 1.1 of rated output current.

Service modes are set by means of control terminal buttons.