World’s first Gas insulated line under a river successfully commissioned (GIL Construction and advantages)

We all know about overhead transmission lines and underground cable for power transmission at high voltage. ABB recently has successfully commissioned 1000 KV gas insulated transmission line(GIL) through a tunnel…

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What is APFC (Automatic Power Factor Correction) relay/Power Factor controller and APFC Panel ? Working and wiring diagram

You all know, What we will do to improve system power factor ..install the capacitors. Consider below case: Suppose you have a electric system on which 10 nos LT motors(…

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What is Unitised or Package or prefabricated or compact substation (CSS/USS) ? Single line diagram, area required and advantages?

Have you seen this (kindly see below picture) ? This is a outdoor 11000/440 volt substation on double pole structure. Why you need this ? Obviously you need Low voltage…

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Buchholz relay(Gas actuated relay) in transformers-Construction, Working , Use, Diagram, specification, codes and standards , installation and testing

Buchholz relay in transformers -Construction, Working and Diagram: General : This relay was invented by Max Buchholz in 1931. it is used in those oil filled transformer having conservators. look…

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Terms related to CT/PT(Burden, Accuracy Class, Instrument Safety factor, knee point voltage etc.)

There are many terms we come across when we read about current transformer(CT) and Potential transformer(PT) or voltage transformer(VT) /capacitive voltage transformer( CVT). below are meaning of these terms. CT/PT…

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