What is the Polarisation index value ? (pi value)and
simple definition of polarisation index ?

Answers were Sorted based on User's Feedback



What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / t k shaw

Polarization Index Test ( PI ) – The PI test measures the
ability of the insulation to absorb voltage over a period
of time. This gives and indication of the overall
insulation quality of the individual pieces of insulation
in the transformer. This test is usually performed in
conjunction with the Megger Test.It is measured as ratio of
insulation resistance (IR)for 10 minutes to insulation
resistance for 1 minute.

Is This Answer Correct ?    92 Yes 6 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / sukhvinder

it is ratio of insulation resistance (IR)for 10 minutes to
insulation resistance for 1 minute.

it should be 1.5

Is This Answer Correct ?    131 Yes 56 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / gunasekaran

IR600sec/IR60sec
this value if it is less than 1 that system should be
replace or repaire if it 1.3 ok 1.5 is good 2 and above is
very good

Is This Answer Correct ?    49 Yes 11 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / r.s.nim

PI test measured the ability of the insulation to absorb
voltage over a period of time.This gives an indication of
the overall quality of insulation.

Is This Answer Correct ?    26 Yes 4 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / thota lokesh

Its ratio between insulation resistance(IR)i.e megger value
for 10min to insulation resistance for 1 min

it ranges from 5-7 for new motors & normally for motor to be
in good condition it should be >2.5 in case of PI value <2.5
over hauling should be conducted for motors and winding
should be thoroughly checked

Is This Answer Correct ?    35 Yes 19 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / rajendra

PI = Insulation resistane after 10min/Insulation resistane
after 1min.
or IR10/IR1 or IR+IL+IP/IR+IL
IR Conduction current
IL Surface leakage current
IP Porising current of water molecule presnt in the
Insulating matrials(usually zero after 10min)
Above 2 is adequate to run the machine below 2 needs
improvement??

Is This Answer Correct ?    20 Yes 4 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / s.ali

Polarisation or PI is the ratio of 10 minutes meggar value
to that of 1 minute.This value must not be less than 1, if
it is so then equipment like motor or transformer shuld not
be put into service for operation.

Is This Answer Correct ?    8 Yes 2 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / ricks

Its a capacity of insulation can withstand with volatge.
gives insulation healthiness,cleaness, moisture contains..
PI is taken as ratio of IR (10min)/IR(1 min).
SHOULD BE >2
1.5- HAZARDOUS
PI = 1+ (Ip/Is+Ir)

Is This Answer Correct ?    3 Yes 0 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / unknown

It is a test of the dielectric strength of the winding insulation.

Is This Answer Correct ?    3 Yes 1 No

What is the Polarisation index value ? (pi value)and simple definition of polarisation index ? ..

Answer / bhushan

1-10

Is This Answer Correct ?    1 Yes 0 No

Post New Answer

More Electrical Engineering Interview Questions

What should be the overcurrent, instantaneous overcurrent, short cicuit current settings (i.e. how many times of motor full load and what is the time duration) for a motor?

1 Answers  


what is XF 200/240 V AC for Drawout Breaker.

1 Answers  


if 1hp jet motar drop voltage when start from 220v to 120v give the reason and solution.

1 Answers  


Dear all, i completed M.E(Power Electronics & Drives) 2011 passed out having 78% so i need job in core side but i don't know how can i receive the calls from electrical companies and i uploaded my CV in naukri, times jobs etc.. In that iam not recieved any mails from good companies so give me best procedure plzzzzzzzzzzzzzzzzzzzzzzzz..... Thanks, K.Linga Reddy Email-id:-lingareddykmthm@gmail.com Ph no:-08015402078

0 Answers  


What is VVVF Drive ?

3 Answers  






How to calculate the load loss and no load losses of the power Transformer? i am having the following details : full load ct : in AMP HV :1676 ; LV:31.5 1800 KVA ;33KV/620 V for wind mill applications

2 Answers   ReasonSoft,


what is voltage present between to phases in a three phase motor?

1 Answers  


how we are measuring the import and export power?

1 Answers  


State superposition theorem?

0 Answers  


The initial current is very large at the time of starting for almost all DC motors. SO WE USE STARTER FOR A SAFE STARTING but at our homes we don’t see any starters in our coolers, motors.WHY DON’T WE NEED STARTERS FOR THESE APPLIANCES?

1 Answers  


Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,


What happen if you keep open the Neutral Grounding Switch in open condition of the HT Generator at starting and again on load if it open then?

1 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)