Answer / k,prakashchandra

As the pf is very low, one of the 3 watt meters will show
negative reading

Answer / natchi

In this test, we use two single phase wattmeters or one 3phase wattmeter, during test one of the 1phase wattmeter reads positive value and other one reads negative value of 3 phase power.

but in usage of 3 phase wattmeter gives directly the whole power of 3 phase supply.

What are linear elements and non linear elements? and I don't want answers with graph related

1 Answers  

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Whot is the difference between MCB and MCCB.Whot is the selection critearea for MCCB and MCB for 63 Amp.

5 Answers  

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what is the differences between single phase ind. motor and three phase ind.motor?

3 Answers  

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How do you maintain the batteries for generators, what is the daily maintenance of a generator?

2 Answers   Jindal,

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WHAT is the no of starts/hr for 3.3 KV, 300 KW motor. Motor is vertical flange type.

1 Answers   DAE, Siemens,

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In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

0 Answers  

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We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

2 Answers   KPTCL,

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can u give me a brief idea about power line carrier communication ??

0 Answers  

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1.why ACB is not connected in HT side what Happens? 2.how much voltage maintained in ACB breaker? 3.OLTC is connected in primary side in case secondary side connected what happened?

3 Answers   L&T,

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what is the voltage between nutral and earth?

2 Answers  

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What is servo motor and what are the applications of servo motor?

0 Answers   BARC,

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what is different between relay and plc?

3 Answers  

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