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.
Electrical cloud of answers, Unlimited study Notes, and Downloads with videos
Subscribe to:
Post Comments (Atom)
-
A Static Transfer Switch (STS) utilizes a static electronic component (SCR), which permits a transfer in less than four milliseconds (1/4 o...
-
Elements - RESISTOR - CAPACITANCE OR CAPACITOR - INDUCTOR = reactance = impedance =susceptance =admittance - VOLTAGE SOURCE - CURRENT...
-
Electrical secondary equipment generally refers to the various types of microcomputer protection and control device, microcomputer seconda...
-
The auxiliary class protection device refers to some unusual protection devices with auxiliary function,the main products are 961 communic...
-
. Earthing system or grounding system connects specific parts of that installation with the Earth's conductive surface for safety and ... -
Main transformer protection Line Protection Transformer protection Motor protection Capacitor protection Generator protection auto-put-into ...
-
generator backup protection relay is applicable to the generator protection that the water turbine capacity whose power is not more than 1...
-
Line protection measurement and control device is simply illustrated that is the device used for the line cabinets and outlet cabinets for p...
-
busbar differential protection relay is suitable for the 110KV and the following various voltage levels of a single bus、Single parent segm...
No comments:
Post a Comment