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Topic :: Transformer





Transformer Interview Questions
Questions Answers Views Company eMail

How to earth the star delta connected transformers?

UPPCL,

1 2868

Define the "All - Day Efficiency" of a Transformer

Transco,

1 3404

How to write a expression to display the first letter in Caps in each word using transformer stage ? Please let me know ASAP Thanks in advance...

Alpharithm Technologies,

1507

what is difference between line differential and transformer differential?

L&T,

1736

what is the use of current transformer in power transformer secondary side.?its connectyed in WTI

1727

what is the meaning of osr in transformer.

2147

How do i perform grounding of star point of Genset (400V) for making connection with step up transformer of DELTA-DELTA (400V to 20KV) ? while Genset itself has its own neutral and grounding bus bar inside genset breaker box whereas we have another neutral and grounding busbar in synchronizing panel next to genset at maximum distance of 6meter, would someone pls advice if we can only perform neutral grounding in synchronizing panel or should we ground neutral on both places inside genset breaker box and synchronizing panel.

Allied Group,

1746

How do I calculate a WTI CT ofa 1250kVA 6600/400V transformer

1757

I have motor 1500 HP and , 4160 V , 60 HZ , then i need the rating of transformer which can feed that motor ??

Elmaco,

1950

What kind of Neutral CT can be placed in 11/0.433KV transformer to be used and what are its specification?

1904

In an existing power plant (phase I) with step up transformers (3nos) with Ynd1 vector group to the 400KV bus bar,an extension power plant (phase II) with transformers (4nos) with Ynd11 vector group >. what are the consequences of such configuration ,please note that % impedance are also differ i.e. 15% & 10.5% the reason was that auxiliary supply interface is at different voltage levels i.e 400v & 6.6KV in phase i and phase II respectively .please advise ! Thank you !

1 2067

before transformer oil dielectric strenght tests are taken the oil should be allowed to settle to remove option 1 air bubbles 2 gasses 3 contamination 4 water

1661

A 400KVA Transformer has 400Hz frequency.if frequency is changed to 50Hz,then what will be the new KVA rating?

ABC,

2 3653

Transformer Parallel Operations

1 4095

How to Calculate Transformer Earthing Electrode Rod Size both Body and neutral Earthing ? Any Standard Formula? Please Suggted

EnPro,

1623




Related Topics


Un-Answered Questions { Transformer }

Difference between PowerPlay transformer and power play reports?

2517


All tape of electrical questions Answers tape of motor transformer e.o.t crane

2657


If one tertiary phase i.e. R,Y or B is earthed of a loaded type tertiary delta connected (Without load)of a power auto transformer, what is its advantage/disadvantage?

2085


what is R Core Transformer. how it differs from normal transformers. dont search in net and post the answer.

2093


Draw the line diagram of diffretial relay connected to transformer?

2440


How to select the earthing transformer,for DELTA TO DELTA TRANSFORMER OR ALTERNATOR SIDE.Pls post your answers and calculation.

2377


Why Transformer Neutral having one earth pit ( more earth electrode resistance) whereas body have many earth pit ( less earth electrode resistance)?

4326


how we arrange the hv side with delta connection in case 33/11kv of transformer.

1999


what is the criterion for selecting vector group of Transformers ? i mean how to decide vector group of Generator transformer, substation trasformer and transformer at consumer end

2358


i need the curve duty cycle and amper for (150 kva @50% dyty cycle) transformer turn ratio :19 and vin 400

2137


what is the effect of connecting three phase supply lines to three phase auto transformer output terminals through a fuse of 10Amp and a circuit breaker (MCB). Is this connection permanently destroy the transformer?

1931


How is the percentage impedence of a transformer fixed at design stage???

1981


How a capacitor discharge weld power supply works? what is the use of a pulse transformer?

2080


what is a pulse transformer? how rise time of pulse changes when ever the voltage changes?

1958


what r the checklist while installing 500 kva transformer

2330