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How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?
HAL,
1799What 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 9401We 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 11617How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?
13716When should I use earth leakage circuit breaker for incomer and when should I use it for each feeder seperately?
1 3648How 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 10354the 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 69911.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.
1933Post New Electrical Engineering Questions
Why syn. Generators are used for the production of electricity?
ELECTRICAL ENGINEER TEST IN FEWA ANY ONE HAVE KNOWLEDGE ABOUT THIS?????????
What is step signal?
Is it possible to make a 5P10/ CT Ratio 50/1A Burden 5VA
what is the significance of tan&delta and how it performed in power transformer
how to calculate the surge level of surge suppressors related to the SF6 cicuit breakers?
what is the difference between Power and Distribution transformers ?
After completing iti in electrician, how can i get certificate of electrical supervisor? What ia requirements. For it?
Is any AC drive(VFD) had a feature of DC injection braking? if available please mention the detail. i.e drive can supply braking torque when the motor in idle state.
I have been using an 600VA with 0.6 p.f UPS with my desktop which has 450W power supply unit. Can anyone explain how can this happen . Because the output of the UPS is 360W (600*0.6) (<450W)
What is the rotor frequency of 10 Hp 1440 RPM 50HZ 415V ?
how to increase or decrease speed in DC shunt motor by DC convertor
With a phasor diagram show the effect of increasing the field current of a generator supplying a constant real power and connected to a grid system.
What is the real function of reverse power relay in generator panel while syncronising?
how much UPS neutral erath leakage current.
