what is the difference between the 94 lockout relay and 86 lock out relay. I have noticed that the 94 lockout relay is activated when the distance realy is activated and 86 is activated when the 87T differential is activated. but why can't the same lockouts be used for both the protection schemes

10 Answers   ABB,

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what happen if we supply ac to the field of a alternator?

5 Answers  

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why two windings are using in single phase AC motor

3 Answers  

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why we use ac?why we use dc? why we we cannot use only ac/dc for all the applications?what happen if we use?

0 Answers  

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Briefly describe three methods that are usually used by electricity suppliers to control voltage levels?

0 Answers  

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list down a few application of ac & dc in a generating station?

1 Answers  

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What is the formula for calculating the Instantaneous Short Circuit & overcurrent for any breaker

0 Answers  

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what is slip?

3 Answers  

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tell 2 reasons for why only copper is used in domestic wires& only alluminium in transmission lines ?

10 Answers   ABB,

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why do you add the load short circuit impedance when considering short circuit amperage. It seems that you should only consider supply. If you need to consider loads and you don't know what loads are to be added , what would be a good sub-transient reactance rating for the loads?

0 Answers  

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which plant has high load factor

10 Answers   APTransco,

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What do you mean by ratio correction factor of instrument transformer?

0 Answers  

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