Answer / jayalakshmi

Voltage regulation is calculated by the percentage difference of no load to the full load voltage with respect to the full load voltage

Why underground cables are used to connect transformers?In addition how are they again connected to lines after step up or step down?

1 Answers  

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campared to ac, in dc corona loss is

4 Answers   DRDO,

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Why only sinusoidal ac voltages are generated?why not triangular or sawtooth?

0 Answers  

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how to calculate power factor rating according to load? please give the answer in simple language, i'm not electrical side

2 Answers  

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What should the transformer connection of a 11/220 kV step up and 66/11 kV step down transformer ?

4 Answers   CGL,

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We have a 33/11kv switchyard having 12.5 MVA power transformer. We export & import power through this transformer. When we export power, the PF will be depend on GRID PF & when we import power the PF will be depend on our load PF. but the problem is that,when neither we export nor import but our 33KV vCB is in close position,our meter read the power factor 0.14 to 0.25 at that moment. So how can be we improve the power factor at that moment.

3 Answers  

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1. which type of transformer connection is preferred in case of power supply transformers? (A) Star/Star (B) Delta/Delta (C) Star/Delta (D) Zig Zag/Star 2. In a power transformer usuall which winding is closer to the core? (A) Primary winding (B) Secondary winding (C) Low Voltage winding (D) High Voltage winding 3. The power factor of a purely inductive load is (A) Zero (B) Lagging (C) Leading (D) Unity.

9 Answers   CECRI_Central_Electrical_Research_Institute,

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suri transmission

0 Answers   Bhel,

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how much leakage current is allowed in MC61A L&T make relay?

0 Answers   Siemens,

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what is trip circuit supervision relay? How does it work in switchgear?

6 Answers   Radha Regent Hotels,

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WHAT IS MODULATION AND NEED FOR MODULATION ?

1 Answers  

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IN 500 KVA TRANSFORMER 11KV/415 VOLTS HOW TO CALCULATE THE HT CABLE SIZE AND LT CABLE SIZE FROM TRANSFORMER TO LT PANNEL. AND HOW MANY MAINSWITCHES OR MCBS WITH RATING ARE TO BE PROVIDED

2 Answers   BSF,

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