why middle phase should used for earth fault and other
phases used for over current in overcurrent and earth fault
relay?
- 7 Answers
- 9066 Views
- ABB, ONGC, I also Faced
- E-Mail Answers
Answer Posted / amrander singh
Please tell the answer Clearly......waiting..
| Is This Answer Correct ? | 0 Yes | 4 No |
Post New Answer View All Answers
in a silicon diode we can measure .7v in a voltmeter.but why we can't use this voltage for using?
7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?
In three pin plug 6 amp. 220V ac rating. Why earth pin diameter is higher than other two pin? What its purpose ?
What is the maximum No. of out going mccbs permitted from an LV distribution paqnel? What is the ampere relation between incomer and out going switch gears/mccbs?
33kv Rated output avilable in market (any where in india)
How do i perform grounding of star point of Genset (400V) for making connection with step up transformer of DELTA-DELTA (400V to 20KV) ? while Genset itself has its own neutral and grounding bus bar inside genset breaker box whereas we have another neutral and grounding busbar in synchronizing panel next to genset at maximum distance of 6meter, would someone pls advice if we can only perform neutral grounding in synchronizing panel or should we ground neutral on both places inside genset breaker box and synchronizing panel.
how we can come to know that motor winding resistance which showing by DMM is right or wrong???is there any chart or something that we will compare & check???
what is the power rating of CPU, CRT type moniter, LCD type moniter,scanner Approx.
Difference of induction motor & servo motor ??
what are problems caused by the pdu in rack server
How To increase Knowledge Of boliler regarding To Only Electrical Field..
The 3 phase Delta connection RB=440V, BY=350V,.......* is Line to Line voltage RY= ? And Formula....?
Single phase and threephase power calculation
Safety of on line ups
What is Bolted fault?
