Dear All,

DC Distribution Panel (DCDB), are the one of the important panel in substation / power plant / factory etc. DCDB explained in this training has two incomers (two sources). One supply is feed through Battery Bank – No:01 and other is feed through Battery Bank- No:02. Interlocking is provided between incomers and coupler, we have explained single line diagram, interlock logic, interlocking schematic / wiring functionality is explained, what is normal position of any equipment, normally open and closed concept is also explained. Finally you can find schematics drawing for self-study.

Following topics are covered.

• Content List

• General Characteristics

• Component List

• Single Line Diagram

• Legends

• Under Voltage / Over Voltage Relay F27

• Concept of in comer and outgoing feeders

• Use to bus tie breaker

• Need of DC supply / batteries for at substation for control and protection

• What is disadvantage of using AC supply for control and protection

• Protection philosophy, tripping and closing coil function

• Interlocking of Incomer 1 & 2 & Bus Tie explained

• UVT Under Voltage Trip Coil in Air circuit breaker

• Timer circuit

• Trip / Close Coil Save contact

• Interlock Logic, Auto Manual Off operations

• Symbols & Legends

• DC Supply Distribution SLD Drawings

• Aux Contacts use, NO & NC

• DC Supply Distribution detail Drawings

• Metering & Indication Circuit at Control Panel

• DC Annunciator Circuit

• Socket & Lighting Circuit

• Typical Lamp Test Scheme

• Terminal Strip Drawings

• Front and Side View

Best Regards