Answer / gunasekaran

in this transformer is delta connected secondary so there
is no provision for earth fault protection so they are
using earthing transformer for earth fault protection.
another purpose it will reduce the inrush current it is
zigzag nature so its reluctance is more than ordinary
transformer so it is like that

we want low electricity at lower speed of fan.what we have to do?

5 Answers  

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How to determine the short circuit current for breakers and VCB.

1 Answers   Sabic,

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Energy metering: On the property I am renting, the supply voltage is 2 x 110 volts. These 2 x phases enter a energy meter which then exit the meter to over head lines to my house. Question 1. The meter is single phase 240 volts but is being used as 2 x phase(2 x 110volt), is this acceptable? if not, please give me the reasons. The meter details are as follows: 60Hz 15amp Imax 100 amp Kd 3,6 Wh/R 1 fase 3 hilos Model FX 231. I think it was manufactured in Brasil From this meter, the cables run along over head aluminum conductors,I estimate the cross sectional area to be 25mm diameter, but the neutral is only about 10mm square diameter, which cover a distance of 170 meters and then terminate with an underground cable of 65 meter length, total length = 235 meters. There must be a huge voltage drop over this length. This line is protected with 2 x 200 amp aluminum fuses after the meter, there is no main switch in the distribution board. These 2 phases connect directly onto 2 busbars. Surely the neutral should be the same size as the conductors if not more? Question2. What are your thoughts about this installation, should there be better protection, is the neutral too small? During the night, the lights dim then brighten all the time, this cannot be good for my electrical appliances. In my home, I only have a small electric geyser and fridge, my stove works off gas. But when i use other appliances like the washing machine or microwave oven, the light dim. The internal wiring of this house is done with solid hard drawn copper wires and of course, they have to be under rated. I am a retired electrician by trade, but not on the metering and over head mains side, my experience is on the factory maintenance side of things. Your expertise on these matters will be greatly appreciated. Please inform me how to rectify or make any improvements Kind regards, my power bill is very expensive, so I need to know how to bring it lower. Kind regards, Brian

1 Answers  

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WHAT IS THE DIFFERENCE BETWEEN KW AND KVA ?

10 Answers  

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what is the difference between surge arrestor and lightning arrestor ?

6 Answers  

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Explain the process of commutation in a dc machine.

0 Answers  

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we use 3 phase supply for induction motor why not use two phase supply .

4 Answers   TLC,

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How to run a three phase motor into single phase........

0 Answers   Oil India,

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i have one transformer 1000kva, 11/.433kv. we are using 200/5 amp. ct unit for measuring purpose, & one 800 amp. V.C.B Unit for the same t/f operate, i wants to known the primary current of T/F is only 53 amp. why we used 800 amp. V.C.B ? & 200/5 amp. CT Unit.

4 Answers  

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what are the installation procedure of high voltage power transformer,CT,CB&PT?

0 Answers   Siemens,

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How to select a contactor? How many types of contactors are available

0 Answers   TCS,

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How to test and satisfy the conditions of the vector group YNd1 for power transformer?

1 Answers   Areva,

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