Answer / blake australia

To detect earth faults:
Zero sequence refers to the current flowing during an earth
fault. 2methods of decting earth fault.
-Measure the current on the earth return cable
-Measure the current imbalance on the 3x phase cables (do
this by putting all three through the same core balance CT.

Answer / prabhakar

For 51G protection we normally use the CBCT(Core balance
current transformer)for to detect the unbalance current
caused due to earth fault

What is percent age of scrap of wires as per IE Rule Clause No in wiring for House and Industrial wiring ?

3 Answers  

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while calculating demand in my company the present load in kw is 212.... there 125kvar capacitor bank is installed by spliting as 50 in departments...the diasplay in panek biard shows 175kw... how could we know the amount of kvar used to compensate the kva

1 Answers  

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what is differance between kvarh $ kvah

1 Answers  

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How to find out freqency in Ac and Dc and also how u control it

2 Answers   MacLellan,

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If the characteristic Impedance is equal to load Impedance then…… a) voltage will be increased b) power transmission is zero c) …… d) max. power is transmission to load

2 Answers  

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It is desired to flood light the front of a building 42 meters wide and 16 meters hig.Projectors of 30 degree beam spread and 1000 watt lamps giving 20 lumen/watt are availabl.If the desired level of illumination is 75 lumen/m and show a suitable scheme.Assume the cofficient of utilization, deprecitation factor and waste light factor are 0.4, 13 and 1.2 respectively.

0 Answers  

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Please mention available current rating for MCB,RCCB,MCCB in the market or any website

1 Answers   ETCO,

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Please elaborate th´evenin’s theorem?

0 Answers  

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why colour of electrical equipment( like transformer) is grey

10 Answers   Trident,

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Dear sir,We have a 7.5hp motor,it was running smoothly and suddenly one winding is carring more current then others(r=6.5,y=6.3,b=10)..whts wrong with tis...?

5 Answers   Hindustan Motors,

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I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase), before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

1 Answers  

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We are installing a 1.6 MVA transformer at our crusher plant and the feeder of HPSEBL is 2 km away at substaion . and a VCB is installed in the substaion which is 2 km away from transformer so we need another VCB near the transformer.

2 Answers   SCPL,

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