Answer Posted / madhu
the neutral grounding transformer is star connected on the
primary and has an open delta on it's secondary.Open Delta
has two terminals.A resistor is conected across these two
terminals. whenever a fault occurs, an emf will be induced
in the open delta and there will be a voltage drop in the
resistor connected. this voltage drop will be sensed by the
potential transformer connected across this resistor. at
the secondary of the potential transformer we have the
neutral displacement relay which will give a trip signal or
an alarm whenever its settings exceed a particular value.
| Is This Answer Correct ? | 46 Yes | 4 No |
Post New Answer View All Answers
What is the effect of pi controller on the system performance?
We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks
What is thresh hold value of current?
why and how current drawn by battery charger depends upon the altitude where it is located?
What is the method of estamating of cable, CB,MCB ?
What should be the percentage increase in length of the dead end clamp for bus bar conductor (Hawthorn) after hydraulic pressing and what should be the applied pressure?
what are the pecularity of shaver sockets ?
difference bewteen reverse current and alternating current
what is the disadvantages of common earthing for AC and DC equipment? (i am talking about inverter control room and inverter duty transformer earthing is common...?)
can i able to get bhel previous exam question paper?
What is difference between Harmonic and Non harmonic Capacitor Bank?
What is the RMS and DFT principle of analogue maesurments. Which way they are advangages. where which princples give optimum results.
how u select control transformer for a mccb panels or any panels?for expample we hav 440 volts maim supply and control volts is 230v?
Can any one know what are the symbols at the down (below) the analog ammeter??? there are 4 symbols which are they ?????
What are the applications of the electric motors?
