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 Posted / atul pradhan
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.
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