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Very high quality videos !

During this test should the CT make some noise?

The primary of the potential transformer is Star Solidly Earthed and secondary is Open Delta. My question: Since the Primary is solidly earthed, could we consider that this potential transformer is like an Earthing Transformer? Thank you

Great video. We know this problems but no one wants to solve them.

Thank you

Very good

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Transform Your Career with the IEC 61850 Masterclass! 🌐 🌟 Ready to take your industrial automation skills to the next level? Look no further! Our IEC 61850 Masterclass is here to revolutionize your understanding of the IEC 61850 standard. 🔧 Dive deep into the world of industrial automation with a comprehensive curriculum that goes beyond the basics. Master the skills needed to read and write data, control commands to Intelligent Electronic Devices (IEDs), and seamlessly integrate protocols into SCADA systems. 🛠 👩‍💼 What sets us apart? Hands-on learning with top-tier industrial simulators, proficiency in protocols like GOOSE, MMS, SV, and SNTP, and a focus on real-world applications. By the end of the course, you'll be a well-rounded professional equipped to tackle the complexities of industrial automation systems. 🌐 Ready to embark on this transformative journey? Enroll now and gain access to the most complete and advanced IEC 61850 standard course available online! 🔗 Enroll Here (www.udemy.com/course/iec61850-masterclass-fundamentals-to-programming) Don't miss out on the opportunity to elevate your skills and advance your career!

Very good. Thanks 🙏

Also this is not a CT. It is a PT.

Why does the narrator sound like he's drunk??

Hello! As we see on the diagram at 1:56 we connect our ac voltage source direct at secondary winding and we measure the current also on the secondary winding with ammeter. In this case we don’t have transformation of the voltage level so the magnetic core don’t interfere! But again we observe the saturation phenomenon. In my mind the proper procedure was to connect our supply on the primary winding and observe(measure) the secondary. Now i am thinking it’s like we power an individual resistance and measuring the current through it. Can you explain me why we still we reach to saturation whilst voltage level between primary and secondary don’t change? I hope you understand my concern!

Excellent visualization 🙏

Nice

I do not get the explanation in English, so I do not get why so why relays have an extra time delay of 300 ms with respect to others. I understand that a relay needs approx. 30 ms to sense the fault and provide the signal + the approx. 60 ms that needs a circuit breaker to trip. But please, coulde you explain me why comes into consideration this 300 ms extra time delay for some relays that adds up to 900 ms extra time delay for the relays located near to the primary power supplies?

I am sorry, but this video is not correct. The output of a broken-delta is 3U0. I have verified this result via circuit simulation and with White Papers from Schweitzer Engineering Laboratories.

electricalengineering0001.blogspot.com/2023/06/working-principle-of-current.html

Where do I find the excel tool?

I have a question. The phase/ground amplitude must be 33,3 V at the beginning. When a ground fault occurs, the vectors becomes 57,7 V. After that sum the vectors by 57,7 with 120 degrees and you have 100 volt. This means that U0 is 33,3 V, not 57,7 V. I'm I right??

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At POWERGRID we use CT Analyzer. Best performance and accuracy.

Very good. Thanks 🙏🙏🙏🙏

Is it possible to get ripple voltage from a voltage transformer? We have a TRENCH VEOT 132 kV voltage transformer which feeds a REF630 (for frequency 50HZ protection). After tripping the disturbance recorder showed that ripple voltage ocured at the moment of tripping.

Hi, I like your video. Thanks

Thankអរគុណបង

I like the jackhammer route No more saturation!

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Thanks for clarifying how a CT works. Can you please do me a favor by kindly providing me the title of the background music used in this video. Thanks

Good explanation

Amazing!

Danke! The video is very cognitive!

Thank you. This really helped me understand the broken delta voltage detector.

Very good. Thanks 🙏🙏🙏🙏🙏

What if you just lose one phase due to fuse filure. IMO then there is no shift in neutral. But we will stil meassure voltage from da dn, and it should be -Voltage of broken phase?

Great video , what if a high impedance or partial ground fault would occur on U-PG1 ? would the voltage rise to sqrt(3) U-PG2 and U-PG3 vectors include the potential difference from U-PG1 to earth as it is not 0 ? what would be the Ue or Uo value be in this case ? as an example, U-PG1 was reduced to 50% of its un-faulted value.

Hi everyone. Great video. i have some doubts regarding a system with the following characteristics: Ground Resistance Transformer star-open delta (with resistor). Primary: 6,6kV / Secondary: unknown voltage. Main network voltage is 11kV, we have a 11kV/6,6kV transformer to supply a switchboard 6,6kV that will supply 2 massive cranes. We also have a 6,6kV generator to supply the cranes in case of power failure. The idea is to avoid the installation having to swap from the network neutral to the generator neutral. What should be the power rating for the GRT (Ground Resistance Transformer) ? What should be the voltage ratio of the GRT ? What should be the value of resistance in ohms for the resistance in the secondary side with the open triangle ? What should be the desired short circuit current in the primary side neutral (of the GRT) ? What should be the current ratio of the associated current transformer ? Hope you can help. Regards to all

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