{Hindi}How to do Tan Delta Test of CT/CVT/Transformer.Practical Full Explanation.

Tan Delta is a a diagnostic test conducted on the insulation of cables and winding. It is used to measure the deterioration in the cable. It also gives an idea of the aging process in the cable and enables us to predict the remaining life of the cable.
It is alternatively known as the loss angle test or the dissipation factor test.
Principle
The Tan Delta test works on the principle that any insulation in its pure state acts as a capacitor. The test involves applying a very low frequency AC voltage. The voltage is generally double the rated voltage of the cable or winding.
A low frequency causes a higher value of capacitive reactance which leads to lesser power requirement during the test. Besides, the currents will be limited enabling easier measurement.
In a pure capacitor, the current is ahead of the voltage by 90 degrees. The insulation, in a pure condition, will behave similarly. However, if the insulation has deteriorated due to the entry of dirt and moisture. The current which flows through the insulation will also have a resistive component.
This will cause the angle of the current to be less than 90 degrees. This difference in the angle is known as the loss angle. The tangent of the angle which is Ir/Ic (opposite/adjacent) gives us an indication of the condition of the insulation. A higher value for the loss angle indicates a high degree of contamination of the insulation.
Method of Testing
The cable or winding whose insulation is to be tested is first disconnected and isolated. The test voltage is applied from the Very Low Frequency power source and the Tan delta controller takes the measurements. The test voltage is increased in steps upto the rated voltage of the cable. The readings are plotted in a graph against the applied voltage and the trend is studied. A healthy insulation would produce a straight line.
The test should be continued only if the graph is a straight line. A rising trend would indicate weak insulation which may fail if the test voltage is increased beyond the rated voltage of the cable.
Interpretation of the test data
There are not standard formulae or benchmarks to ascertain the success of a tan delta test. The health of the insulation which is measured is obtained by observing the nature of the trend which is plotted. A steady, straight trend would indicate a healthy insulation, while a rising trend would indicate an insulation that has been contaminated with water and other impurities.

[@pushparanjansingh47]

On youtube ,nobody has described like you... Superb sir.. now I am a regular student of your class.

[@NiteshKumarElectrical]

Thanks & Welcome too Mr.Pushparanjan Singh for your one of the best feedback for my motivation to teach peoples.

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[@projectengineer1839]

Dear Nitesh sir, i think this kind of videos are not available anywhere, you are the one and only person who is doing this type of socio-technical service. Truly beneficiary for person like me who is working on site and constant relocation from remote area to urban area, is there due to site change. i never get time to go and read the all thing of graduation that is why your video is essential for me. all your video made me learn all this in easiest way. God Bless you.

[@NiteshKumarElectrical]

Dear project engineer ! Thanks for your feedback !!👍 Loved your comment. I know that this type of practical videos are not available anywhere which can directly explain in such a way to teach really needy person that's why I am trying to help peoples through my little try however I am trying best to do. Thanks to recognize my perspective behind such video. All the best !! Give your review always Engineer !!👍

[@ashishtiwari5338]

Sir.. Aap bhut achha deliver krte ho.. Plz aap vedio upload krna continue rkhiye bhut logo ka concept clear hota hai.. 👌👌

[@vedantwankhede7481]

Sir bohot hi badhiya video hai...kaafi detail me explaination diya hai...aur aise hi videos banaiye please

[@sudhirk5400]

Superb.. I think nobody can explain such you, thanks for the video

[@manumanojpeddi3647]

Hats off to you,
I’m the most happiest person now by seeing your videos and getting knowledge of the electrical, hope you will continue for sure

[@NiteshKumarElectrical]

Thanks Mr.Manumanoj ! For your lovable & motivational comment. Such comment really motivate me to deliver my experience more and more in a very easy way of understanding. Keep on watching & sharing on my channel.

[@manumanojpeddi3647]

Nitesh Kumar, Dear sir i have been sharing your videos to my colleagues also , this is my Mail id [e-mail] please give me a Mail reply from You , I have to share regarding electrical testing

[@niradakumardehuryodia3680]

Nice

[@krishnakumar-jp3vc]

Ji super and iam from chennai. Its very useful for every engineer and keep on going. Thanks for your idea.

[@ZahidHussain-wk1zl]

Great bhai... Thank you so much... Bahut acha explaination kiya h...plz keep uploading... I am very impressed with your teaching techniques...

[@abhishekkalita93]

Keep up the good work...a lot of people would benefit from this video

[@hemanthsingabhattu566]

Very informative video sir, thanks for your time, effort and interest. Please keep posting practical videos like this.....

[@rajdeepbhowmick1228]

Thanks a lot. As a fresher very very helpful

[@rajdeepbhowmick1228]

@@indramanishukla thank you sir. Please share some theoritical knowledge regarding tan delta UST, GST and GST-g modes. What is VDF

[@nishikantasahoo9418]

Nice information about Tan delta
Thanks sir

[@umeshsharma-up2qp]

Bahot achha Nitish bhai. Really which way explained practically connection good .

[@naveenkumar-gm2mc]

Dear sir your way of explaining is very good 🙏👍

[@roshansangare]

Nice . You are genius in electrical field

[@osmankhalid8677]

Great nitesh but in one or other way you are directly pose a treat to this greedy world , people do not show hidden reality because their businesses will be in danger...may be ABB,Siemens and other small scale company...
But we will pray for you and take care bro....

[@NiteshKumarElectrical]

Thanks !! But I didn't show internal parts of this kit made by SCOPE/Manufacturer. I have just shown the way of doing the Test. And I thanks somuch to you that you understood the real cause why others don't make technical videos of Electrical. We must share our technical experience to help the peoples. However, I take care of these things,"How to present".
Apart from showing about the kits and all, I can explain theory and procedures. These are just for training purposes only. Thanks once again for your important feedback. Plz keep on giving such feedback.

[@osmankhalid8677]

+Nitesh Kumar but apart from internal structure no one can demonstrated like you because nowadays everyone is greedy either doctor, engineers, film maker, business men ,politicians, General etc..

[@pnpful]

Very practical and to the point video..

[@NiteshKumarElectrical]

Thanks !!

[@abdus.saboor]

Very Descriptive video. Appreciate your effort

[@bapanmajumder4829]

Sir your videos are very very helpful....

[@chankarao2804]

Very useful video

[@juhaanable]

Great video Nitesh sir thanks for uploading such test videos and the best thing is that you explain it so simply to understand pls make more videos

[@NiteshKumarElectrical]

Thanks for your feedback Aryaan Sheikh !! I understand how to teach peoples in simple way !!👍 Please share for others.

[@ahmedraza8496]

Nice video.very informative

[@raghavendrareddy7706]

Dear Nitesh sir-excellent elaboration.....keep going on.

[@viralparmar9889]

Amazing explaination ... Clear voice..
Good work ..

[@SanjaySingh-cz2no]

Good explanation 👍

[@NawadabiharIndia123]

Bahut bdiya video h vai

[@DeepakYadav-sx8wg]

Really very nice 👍👍👍thx

[@VijaySingh-cq7mh]

Bro, Good...👍 Keep it up...Plz posting videos on regular intervals

[@satyenderkumar8630]

Very good knowledge u have and delivers very efficiently in hindi very well. I requested u to post on low voltage I.e. 33kv substation control wiring.it will be very useful to me

[@jagannathnayak6387]

Sir
Aap ne to Video acha rakha
Kadak add.....

[@ali22802]

Very nice video ...... but one thing is that why are you rushing, please detail mein bataye even video lambi bi ho jaye we won't mind.... great video and keep it up bro

[@alamzeb6342]

Top of the top, impressed by your hard work. But why are you not making videos more and more? Audience really need your stuff.

[@NiteshKumarElectrical]

Thanks.

[@milansiddhapura8566]

Appreciate ! You are Professional man !

[@ANKITSINGH-px8zv]

Nice video 👌👌
Sir ten delta testing kar ke dikhiye ga

[@socialjustice8020]

Very very good

[@kesyarammeena8696]

132 KV CT ke ten delta test Wale terminal se dhnua niklta hai kya problam hai charge kare ya nahi aisa dono CT me ho raha hai

[@ahtashamulhaq6028]

Thanks sir form Pakistan

[@santoshsinghtekam201]

Thank you so much dear sir for shared that's information useful

[@muhammadsajjad3186]

Well done u explained very good 👍👍👍

[@sauravmazumdar5369]

Excellent...

[@dr.deepakofficial5314]

Thanks Tan delta knowledge.

[@mayur9699]

Sir
PT me neutral point and tan delta point dono earth hote hai...
Tan delta test karte waqt neutral point bhi open karte hai kya..
Aur agar tan delta point hai gst mode me kyu karege...ust mode me hi karna padega na

[@pinturout2428]

Sir salute you...................

[@NiteshKumarElectrical]

Thanks a lot Mr.Pintu. Loved your comment. However it all depends upon your point of view !! All the best ! :)

[@abhishekkalita93]

really a good one. i wud like to suggest that...plz upload a video showing detailed tan delta testing in autotransformers...starting from shorting of the bushing and software procedures etc. that wud b more helpful for beginners

[@maroofchoudhary2296]

Very good

[@VishalKumar-po7pd]

Nice sir,

[@ashutoshpokhriyal1020]

Thoda video aur lambi banao sir taki result bhi pata lag jaye last me

[@AmitSharma-ir1cn]

Thanks sir

[@meenaprajapati547]

I never saw this kind of video thanks sir

[@NiteshKumarElectrical]

Welcome

[@junaidanu4314]

Sir boht acha

[@nileshkumarmajhi5941]

great video sir. please explain the different modes and tan Delta for transformer

[@RohitAmdavadi]

Hi Nitesh Sir,
Please make video on Power Transformer Tan delta and some special test of X"mer.

[@umarahmed7895]

Good effort Mr Engr

[@the_townleys]

Super nice!😁

[@sameerg]

Awesome video. Sir kindly make a video on rack in rack out of different panels and breakers.

[@NiteshKumarElectrical]

Thanks !! Surely I will make. Wait for sometime !

[@salishah3258]

very good sir hope your next video like that

[@faisalnawaz7467]

First video in youtube regarding Tan delta appreciated.Can u have a pic of tan delta point in cts and scond why u take Gst mode

[@shehab1798]

Thanks mate! Awesome work!

[@Funkyskrews]

Great video!! Thanks alot sir

[@lokanathpanigrahi3208]

Fantastic video sir ,,samajhne me bhi pura aasani hai,,,but sir motor protection relay (abb & micom) ka b video banayiye....

[@NiteshKumarElectrical]

Thanks For your feedback B & GROUP ELECTRICAL !!

[@NiteshKumarElectrical]

Motor protection par bhi banaunga. Thoda wait kijiye.

[@lokanathpanigrahi3208]

Ok sir

[@technicalparshuram3211]

UST and GST details m ek video banaea jisme basic chiz Jan sake..

[@gametiyogesh7631]

Sir 400kv yard me mobile ya computer chalane se koi nuksan hota he..?

[@nandiofficial959]

Ha.....plz explain 🙏

[@vungthungolmurry2250]

Tan Delta Test is done to find: (Insulation life of cables)
1) Capacitance value
2) Dissipation factor
3) Deterioration factor
Done by Meggar
The Meggar has 2 units:
1) Transformer Unit and
2) Control Unit
They are both connected by a cable so that the control unit can give control command to the Transformer unit on how much Voltage (KV) is to be applied
The Meggar also have an earthing unit. Here the Transformer unit and the Control unit both is connected by a common earthing lead able.

[@b.rajashekarengineerscontr7253]

Super explainetaion

[@NiteshKumarElectrical]

Thanks

[@alwarwalaPC]

Hello sir tan delta kit software wala video upload nhi kiya aapne

[@diwakarmishra7227]

Thanks for ur videos

[@ab.raj.3547]

Nice sir

[@mkhan3284]

Muradnagar me testing ho raha hai upptcl me hain aap. Kavinder ji ko jante hain..?

[@priyapatel9320]

Hlw sr how to find type of fault by just observing the transmission line. Plz make video on this

[@NiteshKumarElectrical]

Many factors are there to find and identity the fault. However, just observing the transmission line, it's not possible to find out fault. Relays will shows that at what type of fault circuit breaker tripped. Like it's earth fault, line to line fault or anything at this ich of kilometer/distance. For more watch my other video. How to find fault record.

[@priyapatel9320]

@@NiteshKumarElectrical OK thnx a lot sr

[@JitendraGupta-wu3ii]

jio mere bhai

[@AmitSingh-qi6ik]

very great sir .....thank you

[@khageshchandra7148]

Ht motor ko 10 delta se kaise test karte hai sir kuch jankari de please

[@devanandthakare2263]

Hello sir for RTV coating on high voltage insulator what factor to be considered for RTV coating please answer sir

[@RAHULYADAV-cj1qr]

Pls upload a video of ht cable hipot test ...

[@junaidanu4314]

Great

[@sauravmazumdar5369]

Nice...

[@rockyroy2394]

CVT ka bottom part mein ten delta ka report mines mein kyon aata hai?

[@sumeshk379]

job vaccency for jr/sr testing & commionissing engineer...?

[@abhaypratap7929]

Sir your videos is very helpful to me please make all drawing related videos.

[@NiteshKumarElectrical]

Thabks abhay pratap ji, Yes I am making videos drawing related in VOLUME Wise. I have uploaded Volume-1. I will continue this ...to share my experience free of cost to all ...
Please do share to others who wants to learn very practical electrical engineering.

[@suryadeepzala5873]

nice video.i request you to upload a video of power transformer testing if possible.

[@mohammadpathan4668]

very nice video ! Awesome
.

[@NiteshKumarElectrical]

Thanks for your feedback mohammad pathan ji !!

[@devendraparihar1253]

Very good explanation, make a video of sfra test

[@venuk5888]

Thanks

[@dwaramaswani9792]

Sir you are super

[@jaspalkumar1124]

Type. Of relay ke bare bhi btana sir

[@souravkanungo640]

Very nice..☺️

[@amitchatterjee6897]

You can also do this in powerdb software..

[@bubaigomes3170]

Evabei practical knowledge dijiye sir

[@madnan9268]

Sir you said angle between current nd voltage is 90 degree isn’t it be 0 degree? As pf=cos(angle between voltage nd current)

[@vipulagrawal6904]

Yes he has not explained properly, actually when we do tandelta and apply voltage, insulation are like capacitance, so in them capacitive current generates, that capacitive current is with 90 deg angle to voltage next is all ok explained well.

[@sohailsabeeh5409]

Very helpful

[@velusamypothiraj2300]

What difference between tandelta test and hipot test

[@ManeendraBH]

Good video dude

[@vikaskumarsingh6650]

Good

[@miasif0550]

very good video sir

[@ammaraakram492]

Please share Tan Delta testing of MV cables.

[@milankumarvid]

great explain sir

[@mohammed_assam]

Nice

[@awesomegaming4915]

Sir can we perform tan delta test on suspension insulator disc with this kit?

[@neerajpiplani185]

What is percentage tan delta. Could you explain .What is the acceptable value of tan delta for power transformer hv bushings

[@devendragupta447]

Hf point hi tan delta point hota hai kya?