Answer / subhendu

1.eliminate 3rd harmonics
2.eliminate voltage unbalanced partially.
3.used in 1 phase distribution system

Answer / marsad

In a transmission system star connected transformers are preferred than delta connection.. .
Usually the star point is earthed and connected a neutral current transformer in series with the neutral point and ground.. and works as a 3 phase 3 Wire system..
Whenever an internal fault occurs an unbalaced current Flows through the neutral point and then through NCT if the neutral current above a limiting value a relay connected from NCT (called restricted earth fault relay) will actuate.. Which will trip the transformer and protects it.. This can only be done in star connected transformers..

Answer / engr ali azaz

its used for simly grounding

Answer / gravityguru

it provides a point to create potential difference...
between R-N, Y-N. B-N phases....this is in case of 3phase 4
wire system................
hence we can connect balanced or unbalanced load to different
phases

why dc source used for HV breakers and Relays operation?

2 Answers   Cethar,

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GIVE CONDITION FOR MAX EFFICIENCY OF 3-PH TRANSFORMER AND D.C MOTOR

2 Answers   BARC,

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3 Answers  

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sir what is the minimum IR value of 11 KV alternator?

4 Answers   Kirloskar,

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3 Answers  

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1 Answers  

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To avoid arcing what we connect in earthing.

4 Answers   HAL,

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Why Ferranti effect not occurs at full load?

4 Answers   L&T,

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1 Answers  

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1)which height building required lightning arrester? 2)how to calculate the requirement of lightning arrester? 3)what is the pro instrument? 5)how to test protective relay like overload?earth fault relay?

1 Answers  

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if we have 320KVA Genset kindly advice how much load we can put it.

0 Answers  

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What is the difference between solid grounding and impedance grounding?

0 Answers  

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