Translate

THANKS

Thanks for being touch with us on Social media and online website

×
Thanks!
for visiting the electricaldon.com website.Received many applications for ITI ELECTRICIAN for job. Kindly note our team is working on it, shortly you will receive call from them.

APPLY only if you have Electrical wiremen or Electrical Supervisor Licenses its Mandatory. !

Thankyou for your Patients. !

Search This Blog

What is the Polarization index value? (Pi value) and simple definition of polarization index ?

  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 the motor to be in good condition it should be Greater than 2.5. Polarization Index Test (PI) – The PI test measures the ability of the insulation to absorb voltage over a period of time. This gives an 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 the ratio of insulation resistance (IR) for 10 minutes to insulation resistance for 1 minute.

Labels:

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)

Transformer Fittings And Accessories

  Oil conservator with drain plug and oil filling hole Oil level indicator Drain valve with plug Filter valve with plug Air release vent Exp...

  • difference between STS and ATS ?
     A Static Transfer Switch (STS) utilizes a static electronic component (SCR), which permits a transfer in less than four milliseconds (1/4 o...
  • nema elec symbol with diagram
  • Other two types of equipment
      Electrical secondary equipment generally refers to the various types of microcomputer protection and control device, microcomputer seconda...
  • WTI and OTI of Transformer
      WTI and OTI of Transformer The WTI means  winding temperature Indicator  and OTI means  Oil Temperature Indicator  which indicates the win...
  • ELEMENTS
      Elements   - RESISTOR  - CAPACITANCE OR CAPACITOR  - INDUCTOR  = reactance = impedance =susceptance =admittance - VOLTAGE SOURCE - CURRENT...
  • Power plant protection
      The auxiliary class protection device refers to some unusual protection devices with auxiliary function,the main products are 961 communic...
  • EARTHING
      . Earthing system or grounding system connects specific parts of that installation with the Earth's conductive surface for safety and ...
  • PROTECTION RELAY
    Main transformer protection Line Protection Transformer protection Motor protection Capacitor protection Generator protection auto-put-into ...
  • generator backup protection relay
      generator backup protection relay is applicable to the generator protection that the water turbine capacity whose power is not more than 1...
  • LINE PROTECTION RELAY
    Line protection measurement and control device is simply illustrated that is the device used for the line cabinets and outlet cabinets for p...