Interested to Buy Any Domain ? << Click Here >> for more details...
why middle phase should used for earth fault and other
phases used for over current in overcurrent and earth fault
relay?
- 7 Answers
- 11618 Views
- ABB, ONGC, I also Faced
- E-Mail Answers
Answer Posted / vishal ingle
Not necessary to use only the middle phase.
our Back up protection cosist of two overcurrent elements
and one earth fault element.
under normal condition vector (IR + IY + IB) = 0
in fact middle phase is not used for earth fault prot.
Earth fault relay is connected between the star point of
all three phases (after O/C Relay) and the earth. if any
unbalance occurs, the unbalance current will flow through
the e/f relay.
| Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
How to arrange a hous hold earthing system to keep minimum earth resistance( below 7ohms).
if any house we instaled a 1.5 ton ac and its phase cable of wiring is installed but netrual cable of wiring not instaed. my question is that is neutual of house(for other wiring is capable for ac load or a sepeart neutrual wiring required
If i am running of spindle at 2000rpm ,but How to spindle stop at the second I am resetting the machine in CNC machines
In power transmission using open belts or horizontal shafts it is preferable to have the slack side of the belt on the top because
What is the difference between a Root Locus plot and a Bode plot?
Is there a possibility to use such a treshold voltage for the NMOS part of a CMOS circuit that during the switching it will start conducting only after the PMOS part will be already closed, by this eliminating the leakedge current? Please note, I'm not asking about the well bias in standby mode, but about the "antileakedge" measures during normal operation.
State the factors, for the choice of electrical system for an aero turbine.
What is mason's gain formula?
WHAT ARE THE DISADTAGES OF SINGLE-WIRE-EARTH-RETURN SYSTEM USED FOR RURAL ELECTRIFICATION?
in india per day how much power is generated including all power station
What is pole of the system?
Why Ac Systems Are Preferred Over Dc Systems?
What should be current in the Primary and secondary side of 1000KVA (11KV Supply)Transformer.?
What is the best thing to protect the motor from running over full current. CT or O/L or pressure transducer at the given pressure rating
how many joints are allowed in underground HT cable of 1 KM
