How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?
HAL,
1526What 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 8483We 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 10594How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?
13385When should I use earth leakage circuit breaker for incomer and when should I use it for each feeder seperately?
1 3132How 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 9538the 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 57041.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.
1616Post New Electrical Engineering Questions
Difference between ac parallel circuit and ac series circuit?
HI....HOW CAN BE MESARED THE VALVE OF NEUTRAL GROUND RESISTOR WHIC IS LOCATED AT SWICHGEAR ON GENERATOR SIDE....
How to calculate the phase to phase clearness of HT /// LT bus bar?????
we specify current in case of feeder but in case of distributor voltage, why?
Dear Sir/Madam, I have one questions we have three steam turbines and one Gas turbine and our industry linked with the public network, we have protection system one of the protection is reverse power we can export just four MW only i would like to ask about how to calculate the reverse power. Thank you in advance best regards
What are the basic elements used for modeling mechanical rotational system?
what is meant by directional earth fault and non directional earth fault? describe both.
Why temperature rise is conducted in bus bars and isolators?
How phase displacement change in the over current relay coils.
can any one provide me a connection wiring diagram for a DG set control panel along with BOM?
A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.
700KW 6.6KV slip ring induction motor to use VFD to control the speed
why the rotor current becomes in steady state during high slip region? please verify with equations.
Difference between low impedance and high impedance Restricted Earth Fault
What is a fuse? How does it work? What are materials used?
