Interested to Buy Any Domain ? << Click Here >> for more details...
What is the Polarisation index value ? (pi value)and
simple definition of polarisation index ?
- 15 Answers
- 79526 Views
- Essar, I also Faced
- E-Mail Answers
Answer Posted / josephat murusura
PI is the ratio of the 10minutes megger value to that of
the 1 minute.The minimum acceptable value is 2.Any value
below 2 is not good enough for the operation of the
electrical machine[motor or transformer]& it indicates that
the winding insulation has detoriated.
| Is This Answer Correct ? | 3 Yes | 13 No |
Post New Answer View All Answers
How can claculate to attain the desired PF in the line ( HOW Much KVAR is required ) Pls Give the formula? Equate Petrochemical 0 1 how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec. 0 1 What will happened. if we feed 3phase supplay to the stater with out insert the rotor. How much current will flow through the stater winnding? Equate Petrochemical 0 1 What is required of exietation to the alternater. 0 1 why star point of HT motor not earthed? Equate Petrochemical 0 1 Why we are getting low voltage in star connection? Equate Petrochemical 0 2 What's ND relay & it's functions? Equate Petrochemical 0 2 How instantanious short circuit current is calculated? its formula? Equate Petrochemical 0 2 What is servo Motor? What's the advantages of this motor over Induction motor? Equate Petrochemical 0 2 What is core CT & it's function? Equate Petrochemical 0 3 what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY L & T 0 4 What is required of exietation to the alternater. KNB 1 23 what is the design voltage for 6.6KV 2000 KVAR HT capacitor? Consultancy 0 3 Pls explain about vfd control?Where it is used, Give some example? siemens 1 22 Please explain me abt PQ diagaram in the power sector. 0 9
lorteny method
what happened when we supply a dc current in dc motor?? can it worked properly?
Can any answer me ,What will be the range of C.T coil for L&T energy meter EM301 used for 180 kva DG set
he compression ratio for a petrol engine generally lies between
What is meant by a stray loss of a induction motor??? What is the equation to find it
From what on-site components does the HT panel monitoring the bus-bars in a 11kV system take inputs?
we use capister for power factor. when we use capaciter in dg circuit than defect dg. can we use capaciter bank for dg circuit
Do you need any help with FEWA Electrical Supervisor exams?
What aturn on methods of scr?
Explain the iniluencc of short circuit ratio on the pert'orniancc of synchronous machine.
Can 4pole (3 phase+neautral )RCCB proper functioning in only 3 phase load (no neautral, no Earth) ?
After completing iti in electrician, how can i get certificate of electrical supervisor? What ia requirements. For it?
there is an alternator 480 k.w, 400v,50hz, 4-wire running on load having leakage alternator body earthed current 38 A. is it within acceptable limit? if yes then give reference if no then how to bring within specified limit
what is KA rating and how can we choose switchgears on applications
