Answer Posted / ranjana

manual draw out is the De-assembled procedure of
trolleys(VCBs) FROM PANEL.
A circuit breaker racking mechanism has a toroidal spring
connected between an inner and outer racking shaft. The
inner shaft is connected to the cubicle within which the
circuit breaker truck is moved while the outer shaft is
connected to the manual racking mechanism. The spring serves
as a direct mechanical force transmitting connection between
the inner and outer racking shafts when the breaker which
enters the cubicle is moved to the test position. After the
breaker reaches the test position, the inner racking shaft
is latched so that continued racking toward the connected
position charges the spring connection between the two
racking shaft members. The latch may be remotely defeated to
release the spring, thereby to complete the racking of the
breaker to its connected position under the influence of the
charged spring with operating personnel in a remote position.

What is Tachometer used to measure?

1179

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Please define ohm’s law for a.c (alternating current)?

1024

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i have faced a problem in ro plant grunfos make bm30type pump it is 22kw pump. We start this pump using siemens 3rw 4423-ibc44, 30kw softstarter but this soft starter will frequently failier so we planed to change dol starter. So pls tell anybudy its possible or not.

1874

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71ohm,111ohm,95ohm,179ohm in calculate the total ohm in series circuit

1620

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Please explain me about Relay curves and their sources to read ?

1758

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what is the safe meggar values for motor, transformer HT, LT and Cables? IF we want to replace I/C bay at our 220 kv substation which is of 140 mw load capacity bay to be replaced by 400 mw capacity bay.other than CT(1200/1) what are the other equipment i have to replace. why we generally use 3.5 core cable or in other word 1/2 core for neutral and also confirm me that in balance conditiob(3 phase)current in neutral will zero

2210

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I have 2500KVA transformer delta/star,13.8KV/380V provided with LV 4000A breaker. Already I have 2300KW motor feeder with a full load 90%. Is it possible to connect another 1600A from that breaker? If so how the calculation is done?

3761

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1899

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when we decide to use soft starter drive or vfd drive in mcc to operate apump?

1924

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what reactive how to maintain

1791

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How we can calculate the Amps for the cable Ex:- For 1sqmm wire how many amps we can draw (calculation)

3149

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what are the things that can cause a three phase motor to crawl?

3466

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why we used ZNO in Lightning arrester.

1945

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Please explain, how to test vector group of tranformer(Delta y1) . Thank

1660

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What is the breaking capacity of transformer and how can we calculate the breaking capacity of tranformer

1821

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