Is phase preventer require when overload relay is there
Answer Posted / shashi suman
OVERLOAD RELAY WORKS ON THERMAL PRINCIPLE AS IT CONSIST OF
BIMETALLIC STRIP INSIDE.WHEN THERE IS PHASE FAILURE CURRENT
OF TWO PHASE WILL PASS THRU THE THIRD PHASE WHICH IN TURN
WILL CARRY TWICE THE CURRENT OF HEALTHY PHASE.IF THE MOTOR
IS UNDERLOADED THEN EVEN TWICE OF THE CURRENT OF HEALTHY
PHASE WILL BE LESS THAN OVERLAOD RELAY RATING.AND SO TH
MOTOR WILL CONTINUE TO RUN IN CASE OF PHASE
FAILURE.THEREFORE FOR IMMEDIATE TRIPPING OF MOTOR PHASE
FAILURE RELAY IS PROVIDED WHICH MAY BE BASED ON CURRENT OR
VOLTAGE.
Is This Answer Correct ? | 4 Yes | 1 No |
Post New Answer View All Answers
condition Autotrip facia come on control panel of electrical transmission line?
What will happen if the d.c. Shunt motor opened accidentally running on no-load has its shunt field winding?
what is meant by moulded case circuit breaker ?
Following test should be conducted to find out relative polarity of transformenr terminals A no load test B back to back test C phasing out test D none of above
In single phase ac ups supply when current is measured with tong tester neutral current is found more than phase current.What is the reason?
For high frequency application we use which transformer?
We have Diesel generator of 200KW. fuel consumption is always same,even connected light load or full load. Is it right?
Why the earth to phase voltage is high 250 compare to other two phases
what is the illumination level required for child play area?
I want to do a mini project. Now I'm studying in 6th semis tor EEE Engineering.
aternator every parts and its working
What is nichols chart?
What is notching in dc machine?
According to conduit size which size wiring & how many wires can we provide wires in conduit & how can we select conduit size accordingly?
A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.