what is the difference between LLL and LLLG fault ?

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Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

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How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?

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Please tell me ceilingfan sweep means. Commenly we used sweep1200mm and 600mm MMENLY WE USED CEILINGFAN SWEEP1200MM AND SWEEP600MM

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what is dead tank CT AND what is live tank CT

2 Answers   TATA,

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star delta advantage and disadvantage?

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xplain in detail d pr. of synchronous motors? why syn. generators r used for the production of electricity?

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why alternator is used instead of dc generator and induction generator

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how can we choose the size of road crossing pipe for power cables

2 Answers   DLF,

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Which type of alternator used in power station?

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What are the types of control system?

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Why are calling lagging power factor is a inductive load?

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