Very low frequency test/ VLF withstand test of cable.

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in this video following thing are explained.
1. what is vlf test?
2. why vlf test?
3. how to perform VLF test?
4. what should be test result of VLF test?
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As u said vlf for serviced cable drum.how it is possible to bring service cable to drum.it is very difficult to wound over drum

ArmanDwish
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Why very low frequency signal has been applied across phase and earth . Kindly elaborate on this

prabhatsingh
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Megger value low anney per hum hipot test kartey hain...

Shaktimasti
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Why AC and DC hipot test cannot be performed on full cable drum ?

vishalsinha
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In VLF Test the signal used is sinosoidal or different signal ?

prabhatsingh
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Sir ji, ye vlf test ki jo kit h, vo kit ka name kya h n kaun si company ka h and hum frequency 0.1 yaa 0.01 hz kese apply karte h plz vo bataaye sir plz

arifpathan
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power transformer 150 mva ka video bnao installation testing

MadanSingh-unym
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Why this test is done in low freq rather than high frequency??

pallavmitra