Why R ph of Hv and Lv is shorted or joined together while taking vector group?

1 Answers   IOCL,

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What is difference between unity power factor wattmeter and upper power factor wattmeter? In short circuit test of transformer the wattmeter used is unity power factor type or upper power factor type wattmeter?

0 Answers   Jindal Steel and Power,

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errection check list for transformer maintenance

0 Answers   RRB,

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what size of copper busbar use for 11kv 630A

3 Answers   ABB,

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Can Anyone Answer anyone of these ? Q1) why direct SOLUTION of Load Flow Studies in Not Possile ? Q2)Why majority of Buses in power system are load buses Q3)Why one of the buses in Power system is taken as reference bus (slack or swing) Bus ? Q4)Bus Admittance Matrix is a sparce (means it contains some zero elements ) matrix , give reason

0 Answers  

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Dear Friends, I have a 500KVA transformer supplying whole factory having 3 phase and single phase mixed loads. Power room has ammeters connected via CTs for individual phase. Now I know that readings shown on meter for each phase say R,Y and B are line currents. But when I want to know the total on transformer do I need to add the currents of all three phases readings shown on meter or value for anyone phase will give me the correct power load on transformer for that point of time. 2. If ammeter shows unbalanced readings for R,Y, B phases say 150, 250 and 300 respectively so can I assume that 150A i.e average of 3 will be the 3phase load currents and remaining will be 1phase currents. Please clarify my doubt.

4 Answers  

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why three phase three wire system probably did'nt have neutral

2 Answers   Marico,

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why causes the burnt of AC Electrical Motor ?

9 Answers  

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What is difference between Electrical & Electronic Device? 

7 Answers   AZ Engineering, Vodafone,

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what are inductive and capacitive voltage transformers.what are their applications

0 Answers  

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why are the a.c.series motors preferred for electric traction

4 Answers  

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What is ics,icu,icw of load breaker

5 Answers   Havells, NPCIL,

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