Answer / naveen

SF6 is like VCB except arcing medium is Sulfer hexa fluride gas which is very good non conductive properties & reduces the arc flash it has all the safty relay I.e- over current.earth fault.sensitive earth fault transformer safty relays master trip relay tcs relay.

when voltage increases then current also increases then what is the need of over voltage relay and over current relay? can we measure over voltage and over current by measuring current only?

1 Answers  

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what is the meaning of harmonic in AC waves and when which are prduce and what is the effects on line and give any other information about harmonics

1 Answers  

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what is load vs Torque curve & why it is used?

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In an ACB shunt trip coil and undervoltage coil operated normally( breaker open and charged). But closing coil not operating untill manually discharge and recharging. Any help.

0 Answers   PPIL,

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now a shunt motor is practically a constant speed motor , then how does it meet the increase or decrease in the load ?

1 Answers  

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for compensate 315mh inductance ,how many capaciance required?

1 Answers   Mitsubishi,

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what does a string of resistors in a series will do?

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How much pole motor can be desion for 415 volt ,50 hz.Power supply. in pratical condition . Prakash veer singh

5 Answers  

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800a siemens vcb in our company can not be closed electrcally an mechanicaly cc and oc coils are found ok. why?

2 Answers  

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why tungsten is used in incandescent lamp instead of nichrome though nichrome has high melting point

2 Answers  

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what is difference between induction motor&servo motor.what r types of servo motor?how it works?

1 Answers  

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our company have 750 kva oil transformer.still we have facing a problem that is when voltage is 11.5 kv coming from HT side then LT-side voltage is 420v or above at tape 1.please give me best solution to decrease the voltage

4 Answers   Gannon Dunkerley,

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