Explen all type electrical protection ? like
O/C,E/F,NPS,VOLTAGE UN BLANCE,CURRENT UN BALANCE,NAGETIVE
PHASE SEQ,AND ETC...............electrical Protection
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Answer / sgthakur
o/c prot. means in simple lang.to protect elect.equip.from
being over loaded whether it is in one/two phase.
E/F prot is provided in mainly capital equip.to protect
fr.damage in the winding during insulation failure.
Neg.phase seq. provided to such costly HT motor to protect
fr. serios damage in the elect. equip.due to unbalance in
the system causes tremendous heating in the winding thus
puncture the insulation.
In delta-delta system where neutral earthing is not
available, there to obtain extra neutral earth zig-zag
trans is used for E/F prot.
| Is This Answer Correct ? | 5 Yes | 0 No |
1) OC/EF/OC Relay :
CTs fixed on main 3 phases, these cts connected in star, OC
relays coils are connected by phase cts sec & EF relay
coil connected to star pt. of ct sec.When PH. current
increases OC relay trips as per settings.when any fault
occurs on phase, current flows through ct sec neutral & EF
RELAY TRIPS
2) SINGLE PHASE PREVENTER or PHASE DISCRIPENCY relay used
in voltage unballance
3) Under voltage relay trips by PT sec VOLTAGE set.
4) Thermal relay operates when current unballance between 3
phases.
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / srinivas.v
Above all protectiongiven
through diffrencialrelay
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / sumitgarg
you can change your q. because no buddy will give you such
long deatils.
you should go one by one.
i m telling u the cause of unbalance Voltage---if we r
using a 3 phase supply with the same phase diff of 120*
than u can say the supply is balance.
any irrgulerity from that may cause unbalance voltage.
| Is This Answer Correct ? | 2 Yes | 4 No |
Answer / balaji
The Electrical Protection are quite simple which can be
undrestood from its terminology itself Open circuit(One of
the phase is open),earth fault(One of phase is
earted),Voltage Unbalance & Current Unbalance are
differerntial Protection.
All these faults can protested by providing one single
relays.The type and make of relay i will post u when i got
exact model no.
| Is This Answer Correct ? | 1 Yes | 4 No |
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