Answer / sieai

Power quality can be defined as the degree of any deviation
from the nominal values of the abovementioned
characteristics. It can be also defined as the degree to
which both the utilisation and delivery of electric power
affects the performance of electrical equipment. Draft IEC
61000-4-30 [9] defines power quality as “The characteristics
of the electricity at a given point on an electrical system,
evaluated against a set of reference technical parameters”
(with a Note saying that “these parameters might, in some
cases, relate to the compatibility between electricity
supplied on a network and the loads connected to that network”).

what is the difference between skin effect

0 Answers  

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electrical resistance in human body?please dedails quick. mail.psrinivasan20@yahoo.com

2 Answers   CTS,

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Upto what extent, the lagging power factor can be improved with the help of capacitors?

6 Answers  

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why grid frequency varry time to time?

2 Answers  

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how commomn gate triggering is given for TRIAC ? other thyristor wont be efffected?

0 Answers   BARC,

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we have 350 kva capcitor bank which is not showing KW. dose capacitor shows kW OR not.

2 Answers  

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This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????

2 Answers  

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define differential current and restraining current in relays. how to calculate it by mathematically? post the formulaes.

4 Answers   Siemens, VPEC,

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I have a 25kVA three phase transformer on our property. Will this transformer be large enough to run a large home with swimming pool, spa, 2 off full size reverse cycle air conditioners to service a 100 square house (10,000 square feet or 930 square metres)and the general power consumption of this house without upgrading to a 63kVA transformer.

1 Answers  

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I am designing new project sub station with 220 kV / 11 kV, 40 MVA capacity. This project have many recifier sets, which can generate 3rd harmonics. Now I have to select vector group of This transformer. To minimise 3rd harmonics, what care should I take in selection of Transformer Vecrtor group? If it is Y-Y with open Delta tertiary then what should be the rating & voltage of Tertiary Winding?

0 Answers  

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Can Dy11 and Dy1 vector group transformers be paralleled?

1 Answers  

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why neutral busbar size is half of the phase busbar size in control panels

1 Answers   IBS,

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