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Electrical insulation is hygroscopic in nature and presence of moisture will be there either in low quantity or in excess. When an electric field is applied across the insulation, it starts absorbing electrons from the hydrogen molecules causing ionization of hydrogen. The molecules on the insulator containing water start aligning in the electric field. The energy required to align the molecules comes from the current in the DC test voltage supply. This current is called polarization current. The water becomes completely polarized when the absorption of electron from hydrogen merging with oxygen is completed. Once the molecules get aligned, the current stops. The approximate time for complete polarization is 10 minutes. That is why the IR is measured after 10 minutes of applying voltage.
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Very good video
Joss
Ģrèat
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E konsa megger hai....kon sa make hai
690 volt ki motor par kitna value voltage injection krna hoga
Wow
Please make video of tan delta test !
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Motor star ya delta ya 6 wire ke fom me hoga ye test
Star ho ya delta..
Apko sirji koi ak terminal pe IR tester connect karna he aur dusra earth ke sath to pura motor ka PI ho jayega
@@gyaanELECTRICAL thanks sir
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Polaraisation index test or polarity test Kya done same test hai
No brother,
Both are different
@@gyaanELECTRICAL sir motor or transformer ka polarity test ke uper video banaiye please
Sure
@@gyaanELECTRICAL thank u sir
Good video sir
But why pi value 1/10 minutes.....?
Electrical insulation is hygroscopic in nature and presence of moisture will be there either in low quantity or in excess. When an electric field is applied across the insulation, it starts absorbing electrons from the hydrogen molecules causing ionization of hydrogen. The molecules on the insulator containing water start aligning in the electric field. The energy required to align the molecules comes from the current in the DC test voltage supply. This current is called polarization current. The water becomes completely polarized when the absorption of electron from hydrogen merging with oxygen is completed. Once the molecules get aligned, the current stops. The approximate time for complete polarization is 10 minutes. That is why the IR is measured after 10 minutes of applying voltage.
What is DAR?
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par choti motors me to 15 sec and 60 sec par reading lete hena
Is megger ka details vejiye
1.12 reading is not good condition to use the motor
Yes
@@gyaanELECTRICAL Sir I want to know can we use the motor if the reading come 1.12
Can you tell me what is value of IR for 60 sec and kw rating of motor?
@@gyaanELECTRICALpi value r1.25 y1.33 blue is 1.15
Sir this motor already sent to repairing workshop I just remember only pi value
Just
Why PI VALUE IS TAKEN
It is performed to check condition of insulation in electrical equipment..
@@gyaanELECTRICAL ok thanks sir
Nc
And this value is questionable 😂
Yrs
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