In Current Transformer course we will start from very basics: This course combines brief introduction to Current Transformer with its main characteristic and applications. You will emerge with the knowledge in principles, working, applications, sizing of CT that empowers you to have strong grip on the fundamentals of Current Transformer. This module consists of three parts, each building upon your knowledge based on previous ones. Get 𝟗𝟎% 𝐎𝐅𝐅 on 𝐂𝐮𝐫𝐫𝐞𝐧𝐭 𝐓𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦𝐞𝐫 𝐅𝐮𝐧𝐝𝐚𝐦𝐞𝐧𝐭𝐚𝐥 𝐂𝐨𝐮𝐫𝐬𝐞: bit.ly/Current-Transformer-90OFF
First, the CT connection should be clarified - In this example, we're assuming that we have a 4 wire system - which means that the current that is flowing through conductor A, B, and C is actually actually phase current (4 wire system or WYE connected system). So technically, the CTs are connected in Yd11 and not Dy1. This was pointed out to me by someone. Ia - Ib results in a 30 degree phase shift. Before it's explain, let's be clear which current we're talking about. The primary phase current (current flowing through our 4 wire conductors) and secondary phase current (current flowing in the the actual delta connection) are going to be relatively in phase. Sure, the magnitudes will differ based on the CTR but there will be very little phase shift between the two currents. The secondary phase current (current flowing in the the delta) and the secondary line current (current going into the relay) - that current will have a 30 degree phase shift. Why does this phase shift occur? Because phase secondary phase a current and secondary phase b current are 120 degrees apart. So if we subtract one with another, the resultant phase will be 1.73 times larger and will have a 30 degree phase shift. A very similar example is found another generalpac.com tutorial - ruclips.net/video/9xsubEoKwLY/видео.htmlm50s If this is something that needs be further explained with a dedicated tutorial, please suggest it!
Hey you guys, thanks for the feedback. For all our upcoming videos we won't add any music. Unfortunately, RUclips doesn't allow us to remove the music from previously uploaded videos. Thank you for your understanding. -GeneralPAC team
Hi Satyam, as we reach 30K subscribers milestone, one lucky winner will get a FREE subscription of PSE VLOG series till the end of the year. Just Follow the steps given in the link and get a chance to avail the offer: bit.ly/PSE-Giveaway
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Excellent videos Is there a video explaining the use of grounding of CT terminals in Y connection and delta connection and how the current will flow in fault conditions
Hi, can you show connection from CT to an overcurrent relay where the CT is inside tertiary delta winding. Should we use star connected CT or wye instead. Can you simulate current flow as well. Thanks!
Excellent video. Can you explain why Ia - Ib results in a 30degree phase shift when they are 120 degrees apart? Look forward to the next video in the CT series.
G Robbo also check out the Delta Wye transformer connection video here: ruclips.net/video/UGAzp0CTK2A/видео.html - Where the 30 degree phase shift comes from is explained in detail in part 5b. I hope you find this useful!
25MVA,33/6.6KV transformer primary injection testing done by shorting LV side and providing 3ph supply on HV side. It's consist of differential and sef, ref CT's.. I would like to know actual procedure and calculation.
If we don't ground one side of the secondary circuit, the voltage across the CT bushings may rise due capacitive coupling between the HV winding and LV winding of the CT. Theoretically, the voltage may rise to equal to the line voltage... Which is very dangerous. However in practice, without grounding one side, the voltage rises to uncomfortable levels. As soon as we tie the CT to ground, the CT secondary circuit has a reference and the capacitive coupling problem goes away. Hope this helps. Please like and share these videos!
The burden just means the load that is connected to the secondary CT terminals. Burden (load) includes conductor impedance that connects the CT to the relays, internal relay impedance, etc... So the burden is simply the load connected to the CT.
🔥 𝗣𝗼𝘄𝗲𝗿 𝗦𝘆𝘀𝘁𝗲𝗺 𝗠𝗮𝘀𝘁𝗲𝗿𝘆 𝗕𝘂𝗻𝗱𝗹𝗲: bit.ly/PowerSystemMasteryBundle2024
💥 𝗣𝗼𝘄𝗲𝗿 𝗦𝘆𝘀𝘁𝗲𝗺 𝗦𝘂𝗽𝗲𝗿 𝗕𝘂𝗻𝗱𝗹𝗲: bit.ly/PowerSystemSuperBundle2024
In Current Transformer course we will start from very basics: This course combines brief introduction to Current Transformer with its main characteristic and applications. You will emerge with the knowledge in principles, working, applications, sizing of CT that empowers you to have strong grip on the fundamentals of Current Transformer. This module consists of three parts, each building upon your knowledge based on previous ones. Get 𝟗𝟎% 𝐎𝐅𝐅 on 𝐂𝐮𝐫𝐫𝐞𝐧𝐭 𝐓𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦𝐞𝐫 𝐅𝐮𝐧𝐝𝐚𝐦𝐞𝐧𝐭𝐚𝐥 𝐂𝐨𝐮𝐫𝐬𝐞: bit.ly/Current-Transformer-90OFF
First, the CT connection should be clarified - In this example, we're assuming that we have a 4 wire system - which means that the current that is flowing through conductor A, B, and C is actually actually phase current (4 wire system or WYE connected system). So technically, the CTs are connected in Yd11 and not Dy1. This was pointed out to me by someone.
Ia - Ib results in a 30 degree phase shift. Before it's explain, let's be clear which current we're talking about.
The primary phase current (current flowing through our 4 wire conductors) and secondary phase current (current flowing in the the actual delta connection) are going to be relatively in phase. Sure, the magnitudes will differ based on the CTR but there will be very little phase shift between the two currents.
The secondary phase current (current flowing in the the delta) and the secondary line current (current going into the relay) - that current will have a 30 degree phase shift.
Why does this phase shift occur? Because phase secondary phase a current and secondary phase b current are 120 degrees apart. So if we subtract one with another, the resultant phase will be 1.73 times larger and will have a 30 degree phase shift. A very similar example is found another generalpac.com tutorial - ruclips.net/video/9xsubEoKwLY/видео.htmlm50s
If this is something that needs be further explained with a dedicated tutorial, please suggest it!
Hey you guys, thanks for the feedback. For all our upcoming videos we won't add any music. Unfortunately, RUclips doesn't allow us to remove the music from previously uploaded videos. Thank you for your understanding.
-GeneralPAC team
Is the line current not supposed to lag by 30 degrees. Confused
Very good work.... explained in a very simple way....thnx
Hi Satyam, as we reach 30K subscribers milestone, one lucky winner will get a FREE subscription of PSE VLOG series till the end of the year. Just Follow the steps given in the link and get a chance to avail the offer: bit.ly/PSE-Giveaway
damn. More educational channels should use calming music in the background. It's very nice!
Your words of appreciation are highly encouraging for us. Thank you :)
You might also be interested in our latest Power Systems Engineering VLOG. Give it a try with a 30-Days FREE trial: bit.ly/PSEVlog
Excellent videos
Is there a video explaining the use of grounding of CT terminals in Y connection and delta connection and how the current will flow in fault conditions
Hi, can you show connection from CT to an overcurrent relay where the CT is inside tertiary delta winding. Should we use star connected CT or wye instead. Can you simulate current flow as well. Thanks!
I would like to take your interest towards primary injection on CT's of power transformer by varying the %z(tap changing) and calculation..??
Excellent video. Can you explain why Ia - Ib results in a 30degree phase shift when they are 120 degrees apart?
Look forward to the next video in the CT series.
G Robbo also check out the Delta Wye transformer connection video here: ruclips.net/video/UGAzp0CTK2A/видео.html - Where the 30 degree phase shift comes from is explained in detail in part 5b. I hope you find this useful!
Well done!
Thank you.
Sir kindly do vedios on static and numerical relay protections
25MVA,33/6.6KV transformer primary injection testing done by shorting LV side and providing 3ph supply on HV side. It's consist of differential and sef, ref CT's.. I would like to know actual procedure and calculation.
where I can find why the we ground the terminals? it's looks like y connection
could you please explain the meaning of burden of CT?
thanks alot
If we don't ground one side of the secondary circuit, the voltage across the CT bushings may rise due capacitive coupling between the HV winding and LV winding of the CT. Theoretically, the voltage may rise to equal to the line voltage... Which is very dangerous. However in practice, without grounding one side, the voltage rises to uncomfortable levels. As soon as we tie the CT to ground, the CT secondary circuit has a reference and the capacitive coupling problem goes away.
Hope this helps. Please like and share these videos!
The burden just means the load that is connected to the secondary CT terminals. Burden (load) includes conductor impedance that connects the CT to the relays, internal relay impedance, etc... So the burden is simply the load connected to the CT.