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Download Bus-bars of Substations Bus-bars
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Bus bars in a Sub Station Bus-bars of Substations Bus-bars • Bus-bars are used as the common electrical point where a number of lines operating at same voltage are electrically connected directly • The bus-bar operates at constant voltage and the incoming and outgoing lines in a substations are connected to the bus-bars • Types of bus-bar arrangement (i) Single bus-bar (ii) Double bus-bar (ii) Single bus-bar system with sectionalisation 11 Bus-Bar Arrangements in Sub-Stations Single Bus-bar System Reference: Principles of Power Systems by V K Mehta Single Bus-bar System • It consists of a single bus-bar and incoming and outgoing lines are connected to it. They are often used for 11 kV indoor substation and are not used for voltages exceeding 33 kV • They have initial low cost, less maintenance, and simple operation • If repair has to be done the power supply is interrupted Single bus-bar System with Sectionalisation Reference: Principles of Power Systems by V K Mehta Single bus-bar System with Sectionalisation • The single bus-bar is divided into sections and load is equally distributed on all sections. Any two sections of the bus bar are connected by a circuit breaker • If the fault occurs on any section of the bus, that section can be isolated without affecting the supply from other sections. Double Bus bar system Reference: Principles of Power Systems by V K Mehta Double Bus bar system This system consists of two bus-bars, a “main” bus-bar and a “spare” bus-bar. Each bus-bar has the capacity to take up the entire sub-station load. The incoming and outgoing lines can be connected to either busbar with the help of a bus-bar coupler which consists of a circuit breaker and isolators. Ordinarily, the incoming and outgoing lines remain connected to the main bus-bar. However, in case of repair of main bus-bar or fault occuring on it, the continuity of supply to the circuit can be maintained by transferring it to the spare bus-bar. For voltages exceeding 33kV, double bus-bar system is frequently used. Key Diagram of 66/11 kV Sub-Station Reference: Principles of Power Systems by V K Mehta Key Diagram of 11 kV/400 V Indoor Sub-Station Reference: Principles of Power Systems by V K Mehta