Obtain and Review the Relay AC Single-Line Drawings

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Obtain and Review the Relay AC Single-Line Drawings

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Welcome to the first topic in our journey to test a digital relay!

The single-line drawing is the perfect place to start our relay testing procedure because it provides an overview of the entire system. Watch this video as I work through the first step in our relay testing flowchart and record the important information on the comparison chart.  If you want to follow along, you can download both documents below.

Obtain and Review the Relay AC Single-Line Drawings – Comparison Chart

Obtain and Review the Relay AC Single-Line Drawings -Single-Line Drawing

 

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Click “Mark Complete” below after watching the video so you can keep track of your progress.

9 Comments
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Hello,

I just want to ask about phase rotation, how do you know it is ABC from the symbol?
A means 0
B means 120
C means -120

is it right?

Chris Werstiuk (Group Leader) May 19, 2016 at 8:13 am

ABC rotation with your angles of 0, 120, -120 would be ACB. If you imagine a fixed point at +10 degrees and the phasors rotating counter-clockwise; A would cross first, then C would cross, then B would cross. I would recommend you take the other two online training classes which cover these principles in detail.

Did this video get cut short?

Chris Werstiuk (Administrator) November 17, 2017 at 7:39 pm

It did. This was the first video recorded and it went directly to the three-line drawing. Then I learned that you’re supposed to keep videos short for the modern age and had to do some weird splices. It gets better, I promise.

Sorry for the confusion.

How did you know the CT polarity is facing the breaker ? I know it is a tradition but here P1 and P2 are not marked ?

Chris Werstiuk (Administrator) February 3, 2018 at 8:59 am

Thanks for the question.

The dot indicates p1 and is closer to the breaker.
Also, the relay is connected is connected to the breaker side.

In the end, the polarity mark doesn’t matter after the CT is tested. It’s more important that the relay is connected to the breaker side. Current flow would be the same regardless of where the polarity mark is located as we’ll show in a later video.

HI there. I am pretty unfamiliar with the standards of the electrical diagrams that we will be dealing with here and i was wondering if you had a downloadable list, or would know where to find a list of the various symbols/designations found in the diagrams being discussed. For example the IN101. Any information is appreciated. Thank you.

Chris Werstiuk (Administrator) July 12, 2018 at 10:08 pm

We plan on creating some print reading courses far into the future, but nothing in the near future. I believe Avo Training has a print reading class. Sorry I couldn’t help more.

It’s no problem at all. Thanks for the input!

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