What is the formuala to calculate the rating of motor protection circuit breaker

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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

1 Answers  

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What is the current carrying capacity of 35sq.mm flexible cable?

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In 11/0.414 KV Parralel supply network with Bus tie closed what will be the fault level is it doubled or halved??

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what is sevice settings for mccb?How can be it setted?

1 Answers  

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how could we calculate the no of outgoings from a 800 watt distribution board

0 Answers   United Engineering,

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Can Anyone Answer anyone of these ? Q1) why direct SOLUTION of Load Flow Studies in Not Possile ? Q2)Why majority of Buses in power system are load buses Q3)Why one of the buses in Power system is taken as reference bus (slack or swing) Bus ? Q4)Bus Admittance Matrix is a sparce (means it contains some zero elements ) matrix , give reason

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What is Diff. btw Cat-5 & Cat-6 Network Cables???

3 Answers   Emerson,

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what is stper motor

0 Answers   Bhel, WAPDA Water and Power Development Authority,

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We have 90mX100m hangar with 16 no.of supporting pillar. It is required to provide power supply on all pillars. what is suggested earthing scheme for hangars.

0 Answers   HAL,

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How to measure 20 hp motor resitance

1 Answers  

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Cb closed condition if there is a tcs fail whether cb will trip or not

0 Answers   AADC,

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