Answer / k.prakashchandra

No effect on ammeter.In EM type Watt meter and energy meter
the readings reversed.In ETVM import and export interchange.

Answer / vels

one phase is reversed then the Energy meter will not give correct reading
but 3 phases are reversed then the current direction shown are wrong and the reading of MW ,MVAR are showing import instead of export

Answer / sureshkumar

incase protcetion CT not protective the equipment, so direction is must.

Answer / kj

It only has an effect where the direction of current flow
is important. For example monitoring import and export of
power.

Safety of dry type transformer

0 Answers   Icon,

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what is the use of piston rings in the engine used for a generator...........

0 Answers  

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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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what is meant by oil filled power & distrubution transformer ? if anybody know the link of detail about above transformers means plz send it i have interview on this week ? plz help me

3 Answers  

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KVAR Kilovolt-Ampere-Reactance

2 Answers  

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FEINGING DECREASES THE FLUX DENSITY IN THE AIR GAP. HOW?

0 Answers  

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Why we should use delta connection in primary and star connection in an distribution transformer, which converts 400v a.c. voltage to 33kv.

15 Answers   ABC, Kirloskar, Sify,

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why celing fan is running in anti clock wise and table fan is running in clock wised?

5 Answers  

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comparision between ACB and VCB

1 Answers  

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Why the suply frequency in INDIA is 50HZ

5 Answers   HCL,

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Why r use in the tap changing x' mer.

2 Answers   L&T,

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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