Satyadev Vyas
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Satyadev Vyas posted a blog post

Polarization Index Test -PI Test

The polarisation index test of electrical insulation is the key criteria for testing the healthiness of electrical system. The failure of the insulation cause the device to fail. The insulation resistance value goes down as the temperature increases. The insulation resistance gets halved with  every increase in temperaure by 10 degree centigrade.The moisture also cause the insulation failures. The checking of insulation resistance is one of the method for ensuring healthiness. However, it is…See More
Apr 28
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"What is the Knee Point Voltage of current Transformer and How to calculate it?"
Apr 22
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"Why V/f ratio is kept constant for induction motor?…"
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Apr 19
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"Knee point voltage of CT Read More:…"
Apr 19
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Apr 19
Satyadev Vyas posted a blog post

CT Grounding practices- CTs must be grounded at a single point- Why?

The CTs must be grounded at the single point. The grounding of the CTs at the multiple points lead to the voltage of different magnitude at two points. The realy used for the differential protection may operate when the fault is outside of the protection zone.Read More:https://sdvelectrical.blogspot.com/2018/11/current-transformer-secondary-grounding.html?m=1See More
Dec 29, 2018
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Satyadev Vyas is now a member of The Engineering Exchange
Sep 28, 2018

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Birla Corporation Limited
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Satyadev Vyas's Blog

Polarization Index Test -PI Test

Posted on May 1, 2019 at 10:23am 0 Comments

The polarisation index test of electrical insulation is the key criteria for testing the healthiness of electrical system.

The failure of the insulation cause the device to fail. The insulation resistance value goes down as the temperature increases. The insulation resistance gets halved with  every increase in temperaure by 10 degree centigrade.The moisture also cause the insulation failures. The checking of insulation resistance is one of the method for ensuring healthiness. However,…

Continue

CT Grounding practices- CTs must be grounded at a single point- Why?

Posted on April 22, 2019 at 6:24am 0 Comments

The CTs must be grounded at the single point. The grounding of the CTs at the multiple points lead to the voltage of different magnitude at two points. The realy used for the differential protection may operate when the fault is outside of the protection zone.

Read More:…

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Why V/f ratio is kept constant in VFD?

Posted on April 19, 2019 at 4:30am 0 Comments

The flux produced in the core can be calculated with the formula as given below.

The EMF in the stator/phase(Eb)= -n* Rate of change of flux


Flux = Eb/ 4.44 f*n ----------(1)
Where Eb is the back EMF/phase produced in the stator, f-frequency,…
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Knee Point Voltage of current Transformer and How to calculate it?

Posted on April 19, 2019 at 4:30am 0 Comments

The knee point voltage(KPV) of the current transformer tells the information about the magnetization characteristics of the current transformer. According to IEC,the knee point voltage is defined as a point where 10% increase in the secondary voltage cause an increase in the secondary current by 50%. The current transformer gets saturated at this point.…

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At 12:30am on April 20, 2019, Obakore Jude Oloya said…
Hello
At 10:41am on March 13, 2019, Joy said…

Good Day,

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Stella.

 
 
 

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