A Single Line Diagram (SLD) of an Electrical System is the Line Diagram of the concerned Electrical System which includes all the required ELECTRICAL EQUIPMENT connection sequence wise from the point of entrance of Power upto the end of the scope of the mentioned Work.
As in the case of 132KV Substation, the SLD shall show Lightining Arrestor, State Electricity Board's C.T/P.T Unit, Issolators, Protection and Metering P.T & C.T. Ciruit Breakers, again Issolators and circuit Breakers, Main Power Transformer, all protective devices/relays and other special equipment like NGR, CVT, GUARD RINGS, SDR etc etc as per design criteria.
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