Thank you for the information, i have a question: The HV terminal must be connected to the primary terminal of the CT, we all know CT's have 2 terminals, usally P1 and P2, do i have to short them, or just connect the HV to P1 terminal? In terms of secondary windings, theyre shorted and grounded, am i right? i whould be so grateful if you could clear my doubt
Secondary alrdy connected to meter and relay so, secondary is not open circuit even during tan delta test. The P1 is first remove from the main line only and then the connected to tan delta HV side. P2 is usually left like that since isolator is alrdy open during test(or maybe earthswitch need to be closed?) . I have performed this test once,I think we usually test with 2kV and 10kV at 50Hz and 100Hz frequency. The current being injected inside CT is around 100A.(For 132kV)
Sir I have make a wiring of new substation. Sir before charging of power transformer what we should test performed of power transformer and there protection and control system.
These tests are conducted before taking new Transformer in service: SFRA Open circuit test short circuit test Magnetising current test Magnetic balance test Vector group test bushing tan delta Winding tan Delta Winding resistance test Differential stability test Ref stability test
Sir, When tan delta Test required? As per your best explanation I realized as same as IR Test done by HT megger. Can we this test by HT megger? Thank you very much
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Thanks Sir for this Informative Video 🙂
So nice of you 🙂
very nice elaboration abt tan delta testing, its easy & digestive, pronunciation is very clear. thank you a lot.
Thanks for your appreciation. 🙂
Very good lecture.
Glad it was helpful!
Maa Shaa ALLAH zaberdast
should the frequency be nominal frequency or very low frequency?
Thank you sir,i gain more tips from this video, plz sir upload more video
Nice explanation
How tan delta = Ir/Ic
Calculated using this data?
Helpful.Thank you
Very good 🙏🙏🙏🙏🙏🙏. Thanks
What is tan delta point and where is it connected ,i am having a hard time understanding it.
You have to open the CT terminal box under or on the side of the CT
Thank you for the information, i have a question: The HV terminal must be connected to the primary terminal of the CT, we all know CT's have 2 terminals, usally P1 and P2, do i have to short them, or just connect the HV to P1 terminal?
In terms of secondary windings, theyre shorted and grounded, am i right? i whould be so grateful if you could clear my doubt
P1 and P2 are internally connected, you should not short them.
Secondary windings are connected to meters or relays.
Secondary alrdy connected to meter and relay so, secondary is not open circuit even during tan delta test. The P1 is first remove from the main line only and then the connected to tan delta HV side. P2 is usually left like that since isolator is alrdy open during test(or maybe earthswitch need to be closed?) . I have performed this test once,I think we usually test with 2kV and 10kV at 50Hz and 100Hz frequency. The current being injected inside CT is around 100A.(For 132kV)
Using gst mode do we need to connect to earth?
Sir I have make a wiring of new substation. Sir before charging of power transformer what we should test performed of power transformer and there protection and control system.
These tests are conducted before taking new Transformer in service:
SFRA
Open circuit test
short circuit test
Magnetising current test
Magnetic balance test
Vector group test
bushing tan delta
Winding tan Delta
Winding resistance test
Differential stability test
Ref stability test
@substationtestingandcommis3452 sir please make a video of testing of power transformer and there protection and control devices
Thank you. In which standard appears values of permissible limits shown for Tan Delta?
If tan delta point is not available in CT,then where to connect the Tan delta terminal of the kit
Connect to earthing and take tan delta in GST Mode
Good info...If ct has no tan delta point,then where the lv lead of the kit be connected?
Connect to earthing and take tan delta in GST Mode.
@@substationtestingandcommis3452 ok thank you.
@@substationtestingandcommis3452 then earthing
@@CutieSamriddhi357both connect to earth.
CT secondary terminal short and measured??
Yes, secondary terminal should be kept short.
@@substationtestingandcommis3452 must be shorted & grounded
Nice man
in which standard appears this procedure?
Sir,
When tan delta Test required?
As per your best explanation I realized as same as IR Test done by HT megger.
Can we this test by HT megger?
Thank you very much
IR is not a accurate test for determining the insulation deterioration.
Monitoring trend of tan delta is accurate method.
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What if cvt and CT tan delta points are not earthed plz reply
If tan delta point is not earthed, there is high possibility that CT/CVT may blast.
If we left the tan delta point in grounded then what happens
Ungrounded
Voltage will get developed across tan delta point. CT will burst or get damaged.
What's UST and gst mode
Ungrounded Specimen Test and Grounded Specimen Test
Good
Thanku
Great
شكرا
Thank u so much sir for sharing your knowledge 🙏🏻 ..& purely explanation
Thanks and welcome
❤
hello bro
Hello..
great
❤