Is phase preventer require when overload relay is there



Is phase preventer require when overload relay is there..

Answer / 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

More Electrical Engineering Interview Questions

can any one tell me the formula for calculating the power and unit consumpetion

9 Answers   Avalon,


What kinds of decision are made about CT from it's Knee point(voltage & current)?

2 Answers  


why we are using R,Y,B colours for 3 Phase ?

4 Answers   ITC Infotech,


what's prime importance of protection in electrical system.if protection system don't work properly what can happen in electrical system?

0 Answers  


how much earthings are provided for 22KV HT Metering Kiosk

1 Answers   GE, Gionee, Knight Frank, TATA, Vacmet,






Iwould like to know barc interview questions

0 Answers   BARC,


why the rotor current becomes in steady state during high slip region? please verify with equations.

0 Answers  


why in the three pin plug all 3 pins are cutted ?

0 Answers  


how and why are capacitors are used to improve powerfactor?

4 Answers  


What type of motor is used inside computer CPU.

11 Answers   Bhel, TCS,


If a manufacturer decribes a power supply transformer as providing a secondary voltage of 24 volts when connected to a 240 volts supply, do you think they are refering to the full load or no load secondary voltage?

3 Answers  


can we use 400w coke instead of 250w choke in 250w fittings

2 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5084)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16631)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1094)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)