Why CT secondary can’t be kept open circuited | Explained | TheElectricalGuy

[@123kalaiselvan]

Thanks 🙏 Gaurav day by day my knowledge in electrical is increasing because of watching your videos❤

[@GauravJ]

Happy to know that! Keep watching keep learning 😇

[@kamakaziozzie3038]

Transformer theory is arguably one of the most complex disciplines of overall electrical theory. It’s nice to see someone break it down into smaller easier to understand videos. You could spend a year making videos on transformers and their different variants.

[@RabinMalimbo-wu2xm]

Thanks For being my Role Model and Teacher as Well I appreciate you

[@GauravJ]

I appreciate that!

[@taninswgnamwong496]

Many thanks for the video, this is recall my memory from my institute of technology I have learned, it was taken a few days to gain understood but with your video it take only a few minutes to understand everything behind it.

[@GauravJ]

Glad it helped 😇

[@oliahamed6848]

In situation 02, you have said Vp is 36kV, but as CT is connected in series of a transmission line how the Phase to Phase Voltage can be considered as the applied voltage between CT primary P1 and P2 Terminals?

[@nishant1088]

Thanks Gaurav J, always a great refresher for professionals like me.

[@GauravJ]

Good to know that!!

[@tapananilsamant2283]

Nice video... Making complex things simple... God bless u....

[@GauravJ]

Thanks a lot 😊

[@danoilca]

Hi! In my point of view you have made a mistake: Vp is not 36 kV. The value of Vp is equal to the voltage drop produced by the CT in the series circuit, with Vp max at1000 A (and much more in short circuit situation). The main difference between a conventional transformer and a CT is that in the former, the primary current depends on the secondary current and the magnetizing flux is the subtraction of the flux produced by the primary current and the flux produced by the secondary current. In the CT, the secondary current depends on the primary current and within certain limits given by the load characteristics, the resulting magnetic flux will also be as in the conventional transformer, the flux produced by the primary current minus that produced by the secondary current. If for some reason the load on the secondary winding decreases, to maintain the balance of currents and flux, the secondary voltage must increase, for example, if Ra is 20 Ohm instead of 2 Ohm, the voltage at the CT terminals will be 20 V instead of 2V for the same current of 1A . In the hypothetical case that the secondary load is an infinite impedance Ra=∞ (open circuit), the secondary voltage would increase for keep the balance current in circulation until it reaches its dielectric strenght limit.

[@subhampoddar3932]

I also agree with @danolica ... Please give the clarification on that @Gaurav J

[@lapub.]

Do you know why the manufacturer didn't put a spark gap or some Transient-voltage-suppression diode ?

[@vinayakpatil6661]

i too agree with @danoilca . @Gaurav J pls explain

[@alhajiabubakarrkargbo769]

It’s very helpful and simple to understand. Thanks for the effort and will be grateful if you can make video lecture on CT sizing

[@GauravJ]

Thanks !!

[@emreaybeyy]

Could you explain why do we connect the secondary windings in reverse order with respect to the primary in CT and dont do this in the power transformer?

[@ragunathansrinivasan6324]

It i😂s explained in elaborate way.Thank you.

[@KibetKelvin-zr5un]

Things I was getting complex now am getting it easy ,thanks

[@GauravJ]

Good to know that!! Do share!!

[@bhaskararao4319]

Hi.. I have seen all videos.for equipments, it has very clearly explained of equipments. Request you to present for details power transformer with the parts and function wise.

[@GauravJ]

Thank you! Sure. I will try that 👍🏻

[@akbanchhor1499]

Excellent explanation with calculation 🙌💯

[@GauravJ]

Glad it was helpful!

[@Sudharshan9834]

Exllent explanation sir,❤

[@GauravJ]

Thanks and welcome 😇

[@badshahengineeringvlogs9718]

It's helpful thanks ... please make video on etap

[@GauravJ]

Thanks for the feedback

[@francisjeremybennie5029]

Very helpful. Thank you.

[@GauravJ]

Thanks for the feedback

[@manusibs]

please a video on auto transformer construction and testing

[@MrAngkorborey]

Great content bro

[@GauravJ]

Glad you think so!

[@qendrimzeka2133]

36 kV is the voltage between phases (line voltage). But the voltage between the Primary terminals P1 and P2 of the CT is not the line voltage.

[@san002100]

Hi brother, if CT primary is no load condition only 36kV voltage present & CT secondary also open whether CT secondary terminal voltage will present.

[@anoimo9013]

the voltage on the primary of current transformer is de difference in potential between the incoming line and the outgoing line. this is not necessarily the line voltage

[@zainrana6924]

Why we use CT shorting relay in the HV & LV side of auto-transformer in the substation?

[@norankunda3993]

You are the best ❤

[@GauravJ]

Thanks!!

[@splitprissm9339]

I am coming more from the direction of appliance repair and restoration, so forgive my understanding of grid equipment is limited. My understanding of a transformer with a saturated core (due to too much voltage or too low frequency) is that impedance of the primary will be lowered, reactance will be lowered, magnetic coupling will be lowered due to the transformer acting like an air core transformer with permeability of air, harmonics will be generated due to core saturation effect making transformer primary and secondary inductance and reactance non linear with voltage. I would assume, in a current rather than voltage limited situation like you describe, lowered reactance due to saturated core would limit energy in the open circuit CT rather than make the problem worse. What am I missing?

[@Sudharshan9834]

Sir how much voltage is induced in case of Secondary is short circuit,in the video only said the voltage drop V=IR=1*2=2 volts this only voltage drop, what about the induced voltage in secondary,i get confused sir

[@stargazer7644]

The voltage in the secondary depends on the load on the secondary. With 2 ohms, it is 2 volts. With an open circuit, it is megavolts.

[@BattlegroundsMobile-fb9pi]

Very helpful boss

[@GauravJ]

Glad to hear that

[@leonidesbayson-img1172]

Helpful. Thanks

[@GauravJ]

Glad it was helpful!

[@poovarasang8476]

Hi I hope you are doing well.. Why the CT star point towards protection area (for example line protection means towards line or bus bar means towards bus) & how relay knows it ..? Please create some about this topic

[@Kollysman]

Thank you for this amazing explanation on why CT should not be open circuited. ❤

[@GauravJ]

Glad it was helpful!

[@Dave-id6dk]

CTs are definitely a challenging aspect of electrical theory to understand, so I don't want to be harshly critical of the maker of this video. Having said that, because so many people in the comments think this is a good explanation, I feel compelled to point out that the 36,000kV volt figure presented at the end as the open-secondary voltage is absurd. THAT'S A CRAZY NUMBER--36 million volts! Most reputable sources will describe numbers that venture up to a few kV. A better explanation would make use of a simple phasor diagram to explain the dynamic between burden current and the components that make up the primary current: the ratio current and the magnetizing current. In brief, when a CT is open-circuited on the secondary side, no primary ratio current exists and the entirety of the primary current becomes magnetizing current. This pushes the core into saturation, and the normally sinusoidal core flux gets distorted into a square wave shape. This flux has an extremely high rate of change at the zero crossing, producing very high EMF spikes. THAT is the reason why CT secondaries are never opened. (PS. Coming from a professional substation electrician and electrical theory instructor)

[@JokerJoker-tm8rh]

If the meter is connected to the secondary we are getting the voltage drop of 2V then , then 36000Kv- 2v will be resultant voltage even meter is connected, then how could be the safe.

[@stargazer7644]

When the meter is connected, the voltage is 2V. Not 36000kV-2V.

[@Sudharshan9834]

Please make video on the C(capacitance) point why point sir i seen all equipments(Ct,Pt)

[@Sudharshan9834]

Turns ratio a=primary turns/Secondary turns,N1/N2, where transformation ratio is K=secondary turns/primary turns,N2/N1

[@Sudharshan9834]

If in case of potential transformer this not happened why sir,there also secondary having winding

[@GauravJ]

Potential transformers are connected in parallel so just like a regular transformer

[@Sudharshan9834]

If I open neutral point of PT what happen sir

[@listen2gether538]

Perfect ❣️

[@alanwhite4003]

Brilliant, very well done 👏

[@GauravJ]

Thank you so much 😀

[@cherediribe9281]

please do us a video on PID Controller

[@chanduprabha366]

Great explanation brother...❤️

[@mohsenbahoosh2109]

prfect.. just pls add Persian subtitle

[@vickytwentythree]

He is from India how would he add a Persian subtitle?

[@chrisposiquit2313]

Very helpful sir,big thanks for sharing electrical informative videos.

[@kryadav2639]

Very good explanation 👍👍👍

[@gerardogamez6905]

Helpful

[@GauravJ]

Thanks for the feedback!

[@ramaswamykunduchettipalaya5066]

Excellent Explanation!!!!

[@ManiKandan-kf6qe]

Very well explained brother.

[@josephwodi3820]

helpful 🙃

[@taher10111]

well well...nicely explained.Thanks a lot sir..

[@GauravJ]

You are most welcome

[@bheemeshbatta2172]

Wrong explanation, the line to line voltage 36 KV need not be CT primary voltage and also CT need to modeled with current source, if the CT gets saturated the voltage developed at the centre gets disturbed and voltage developed will be other than sinusoidal.

[@MukundVyas-ul6ns]

Such a helpful video 👍

[@vasu2415]

Thanks sir it was very helpful video I have ever watched

[@abdullaeyad4188]

Thank you for your smooth and clear explaination ! How come an open circuit condition is dangerous for the CT but not for the transformer ?

[@stargazer7644]

Because there is still current in the primary of the CT with an open secondary, but in a regular transformer if there's no current in the open secondary, then there can be no current in the primary. This was the core takeaway from this video.

[@TanseerAhmed-r9b]

How you have taken the Primary side 36kV. As CT is connected in series, it will step-up those voltages which is drop across primary (which is in milli-volts as primary is single turn normally). Completely wrong explanation

[@wlz70try]

Thank you Sir ❤❤❤❤❤

[@GauravJ]

Most welcome

[@sunilkumar-md7rj]

Sir, please make video in hindi language also

[@mayurvaghela185]

A huge thank you sir .....

[@GauravJ]

Most welcome

[@trader573]

❤

[@ratilalpatil995]

Very Helpful

[@GauravJ]

Glad it helped

[@abdoomara4892]

❤Very helpful

[@GauravJ]

Glad you think so!

[@lusanimudau720]

Nice work

[@mayurvaghela185]

Helpful....

[@GauravJ]

Thanks for the feedback

[@ajazahmadkhan879]

so much helpful

[@abhinavthodupunuri2464]

helpinggg

[@Sudharshan9834]

In case transformer nothing when secondary is open circuit Why both same principles

[@stargazer7644]

Because there's no current in the primary of the conventional transformer, but there's current in the primary of the CT.

[@nealesmith1873]

Nice!

[@brightsonamos9506]

HELPFUL

[@GauravJ]

Glad it was helpful!!

[@honomegegnet7306]

👉👉👉 36000 KV a very dangerous one. I have not seen this phenomena until this time thank you.

[@sharmitaoran1734]

Helpful

[@GauravJ]

Thanks for the feedback!!

[@KSdanceofficial-2014]

Helpful

[@GauravJ]

Glad it helped

[@LawrenceChipandu]

Helpful

[@GauravJ]

Glad you think so!

[@saretpreap4978]

Helpful

[@GauravJ]

Glad to hear that

[@durveshdichwalkar603]

Helpful