How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?
HAL,
1417What is the min.& max distance between two earth spikes is required for measuring earth resistance of an earth pit? Is the manufacturer of Earth tester decides this? Pls explain.
3 8157We use ungrounded DC system (220V/110V) for control and protection system in substations etc. Suppose we have long 2 core DC cables running from our DCDB in control room to the load (length of around 2 to 3 km). Do we need to protect these long DC cables from earth leakages or not? If yes how?
5 10197How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?
13271When should I use earth leakage circuit breaker for incomer and when should I use it for each feeder seperately?
1 2938How can I communicate with an Areva MiCOM P121 relay by RS485 port? In other word, which command can I send and what information can I have recieved? please send some refrences, please. thanks
3 9217the distance from my office to d.g is aprox 400mtrs and voltage drops ibn my office near about 40 volt what should i do p[ls suggest.
6 52451.what is the funtion of chiller primary & scondary pumps. 2.what is the use of distribution lines & Types. 3.what is the use the thermal power stations & how much capacity.
1503Post New Electrical Engineering Questions
Discribe type of fault in DOL and stardelta startor.
how hydrogen cooled alternator undergo maintanence ? that is hydrogen when come in contact with air can result into explosions .
What is the previous name of Cox's Bazar
Differentiate between real and apparent power?
how to calculate units consumption for a 12 hp motor /hr.
What is the loss of power of transformer 220kv/33kv,63/80mva of % imp12.05 at 80%load
What is relation between transmission lines & Communication lines ?
From reading, Under voltage relay used also as phase sequence relay now, Why I use under voltage and phase sequence relay in the same circuit (ATS)?
Why frame of the motor is specified?. If we mention KW and voltage level,automatically frame is decided or separately frame is compulsory to mention?.
sir i ve applied for hindustan petroleum and power grid india ltd..and the exams on feb 22.can you pls send model papers and tell how to prepare for those.i need to get into any of these for sure.....
what are the stresses in circuit breakers ?
How to select a cable size for particular load?
if we have 320KVA Genset kindly advice how much load we can put it.
which phase is preferred for connecting 1 phase vt used for synchronizing OHL? WHY?
what is the AC Plant and how can do the work with parts and picture tell us 150 Tr