How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?
HAL,
1568What 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 8604We 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 10752How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?
13422When should I use earth leakage circuit breaker for incomer and when should I use it for each feeder seperately?
1 3204How 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 9647the 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 59121.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.
1655Post New Electrical Engineering Questions
how to check regenerative load in drived motor
why we dont prefer ac voltage controller instead dimmerstat [if both have same rating] for conducting experiments in laboratories?
How to calculate Grid rotor resistance(GRR) losses in slip ring induction motor?
What do you mean by the zone of protection?
The slip during plugging operation is given by= A 1-s B 2+s C 1+s D 2-s
What is meant by reverse polarity and how it can be fixed?
A TRANSFORMER 440/400V,DELTA/STAR CONNECTED.THE NEUTRAL CONNECTED WITH GROUND CABLE THAT IS DIRECTLY CONNECTED TO THE PANEL,FROM PANEL IT IS CONNECTED EARTH PIT.IS IT RIGHT? IF IT IS RIGHT LEAKAGE CURRENT AFFECTED.SECONDATY IS PROTECTED WITH EARTH LEAKAGE RELAY.
Why is better to have a minimum ceiling voltage of 250% than 160%?
How can eliminate noise problem inside temperature controller temp. variation due to contactor chattering problem.
What is the suitable transmission voltage?
Why the symbol of register is "zig zag"
Two liquids hot and cold in two vessels are there and an metal bar acts as a conductor of heat between the two vessels. what happens then. what happens after 24 hrs?
diameter of cable and core is doubled then the value of capacitance is
Differentiate between kirchhoff’s first law and kirchhoff’s second law?
If one lamp connects between two phases it will glow or not?