Operation and commissioning of 33/11 kV power substation

33 KV Switching Substation

This thesis report is prepared in according to the operation and maintenance procedure of 33/11KV Substation, including emergency maintenance work. This is a switching sub-station from where Dhaka Palli Bidyut Samity -1 and other PBSs are controlled.

It has thirteen feeders from where different PBSs are fed. Actually it is consists of a feeder controlling room and a switching yard.

All controlling such as line current each feeder, line and phase voltage for each feeder are measured by many Low Tension (LT) panel and High tension panel (HT). Switch yard is the place where the actual equipment are working properly.

This switching sub-station is mainly consists of two parts. The main components are described below briefly:

1. Switchyard
2. Control Room

Switch Yard

This is a large place where switch gear components are paced according to the one line diagram which is provided by an experienced electrical engineer after electrical calculation.

Isolator

In Sub-Station, it is often desired to disconnect a part of the system for general maintenance and repairs. This is accomplished by an isolating switch or isolator.

If an isolator is opened carelessly, when carrying high current the resulting arc easily causes flashover to earth. This may batter the supporting insulators & may even cause a fatal accident to the operator, particularly in the high voltage circuit.