What are the protections for HT Motors?

1 Answers   BARC,

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i have ht transformer of 142 kva with air cooled facility,having secondary voltage 7850volt, and secondary connected full way bridge rectifier .i faced the problem repeatedly that transformer one coil and rectifier diode of two phase was burnt two times. i checked all the secondary ckt. no any short ckt found,then what will be the cause side

2 Answers   Modern Terry Towels,

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What is meant by IP55 motor.Where it is used?

2 Answers   Zuari,

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my bachelors was done with EEE now i got admit in NU with CS as course. how to answer this qns 1) why u choose cs? 2) why u changed from eee to cs

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why most of the substations are rated in multiples of 11?

4 Answers  

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what is the star delta connetion and how can do it a three phase motor with control witing with picture

0 Answers   Aurobindo, SA Kent, Wipro,

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what is mean by harmonics?Type of harmonics?

6 Answers  

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Draw the wave shape of armature current in a generator subjected to a sudden three phase short- circuit at its terminals. Define various reactance of generator from this wave shape.

0 Answers   VECL,

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What is the method to solve circuit using source transformation?

0 Answers  

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How to calculate CT ratio for 11KV 1500KVA Transformer 500KVA MD and 1400KVA connected load ? Note:- As per MSEB(Maharastra state electricity Board)

1 Answers  

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Q.1:What protection will be used on HT and LT side of 33/0.4 KV, MVA transformer. Indicate capacities of protective device to be used. Q.2:Which types of back-up protections are used in the power transformers? What do you understand by the term over travel in the relay? Q.3:How star and delta connected winding transformer are provided from earth fault

0 Answers   MPSEB,

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It is advisable 2 use auto-transformer if transformation ratio is-a)110KV/11KV,b)230kv/110kv,c)110kv/66kv,d) 400kv/230kv

2 Answers  

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