Answer / k.prakashchandra

Any variation in frequency results in variation of speed of
motors and inductance/ capacitance of loads.Drop in
frequency means generating capacity is less than required.

HOW TO CALCULATE THE HEAT AND LOAD OF LT-SUBSTATION WHICH CONTAINS 2*1MVA TRANSFORMERS,LT-SWITCH BOARD,MLDB,ACB,BUSBAR,ETC,......?

0 Answers  

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How we select the cable rating

1 Answers   BTM, Videocon,

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Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?

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Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

0 Answers   Bhel,

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Why dc supply is used for closing and tripping coil of ht breakers. What happen if we use only ups ac supply only.

12 Answers   ACC, JLL, ZETDC,

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i m electrical diploma holder i want to do plc $ Scada some body tell me which insitute is best for me near chandigarh

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simple way to find busbar sizes??

1 Answers   SPAC,

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i have 3500 amp load and select current transformer and perches.how i calculate .please understand

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capacitor is load free component but why ampare meter shows current when capacitor bank breaker close?

5 Answers   Bhel, OPS,

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I meggared my 2c*70 sq mm AL AR XLPE cable. its one end show 50 M ohm . is my cable is safe for laying. I have only one phase and neutral.

0 Answers  

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whta is difference between contactor and breaker.

6 Answers  

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can we use only a isolator in the subtation..

1 Answers   ABB,

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