Answer Posted / ramji

Line PT has metering and Protection Cores. Its main use is
to mointor the Line Voltage parameters and is widely used
in protecting Lines in case of Faults occuring due to Phase
to phase faults and phase to earth faults which comes under
its review.

sometimes it has a core for meeting synch with respect
others incase the line breaker opens

Bus pt has metering core and protection core for BUS BAR
protn which mointors the faults in all the buses with
respect to that in a particular substation only

Explain cos(theta) and Sin(theta)

2155

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1109

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1965

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What is power factor why we should maintain the power factor unless what will happen

1976

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what is droop control?

2249

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why and where we use early make & late break contacts in protection?

8375

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2264

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In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes

856

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1))why we run three phase or three different circuit from a single conduit 2)) why not two circuit of different phase run in same conduit?? and why we run same three cicuit of same phae run in single conduit??

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what is a bus riser in power system and why it is used

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draw singleline diagram of star to delta and dol starters

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