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# MV/HV Learning & Multiple Questions

## MV/HV Learning & Multiple Questions

(OP)
Hi everyone, first post here. I recently changed jobs where I went from <600V to MV/HV. I reviewed the free resources on this site and was a little overwhelmed on where to start. Does anyone have a good recommendation on what to read first? I'm interested in learning more on relaying terminology to help me sort through One-Lines, Three-Lines, Wiring & Interconnection Diagrams.

Most of the stuff that I'm working on is 23kV, 115kV, and 345kV.

I'm also looking for more info in regards to Primary and Secondary Systems at Substations between the Control House and the Yard Equipment. Is this simply for redundancy and what are the design standards for this?

Also what does a CT with ratings 1200/5MR and 600/5T mean? I believe that the 1200/5MR means that 1200A on the circuit will yield 5A on secondary and it is multi-ratio but I don't know what the 600/5T is and why it has two ratings.

### RE: MV/HV Learning & Multiple Questions

I would start with the IEEE series of books; 242 Buff Book(Protection & Coordination), 141 Red Book(Power Distribution), 241 Gray Book (Electrical Power Systems Commercial), 399 Brown Book(Industrial and Commercial Power Analysis), etc.

The CT rating 'MR' does indeed mean Multi-Ratio. 'T' typically means that this is a 'Tested' rating, as opposed to 'C' which stands for Calculated. A CT of nominal ratio 1200/5 (or 1200:5) will indeed yield 5A on the secondary when 1200A flows on the primary.

### RE: MV/HV Learning & Multiple Questions

You can start with Power Distribution Engineering Books. Here is the list.
1955
Donald Beeman, Industrial Power system Handbook, Mc Graw hill Book Company, Pages 971, 1955

1966
Eustace C Soares, Grounding Electrical Distribution Systems for Safety
Juan M Gers, Protection of Electricity Distribution Networks (IEE Power and Energy Series)

1993
IEEE Std 141-1993 Recommended Practice for Electric Power Distribution for Industrial Plants (Red Book)

1994
James J Burke, Power Distribution Engineering, Mercel & Dekker Inc, 1994, Pages 356

1995
Joseph F Mc Partland, Handbook of Practical Electrical Design,ed2.0,Mc-Grawhill Book Company,1995, Pages 732

2007
J R Dunki-Jacobs, F J Shields, Conrad St.Pierre, Industrial Power system Grounding design Handbook, www.groundingdesignbook.com Pages 568

2008
Kamalesh Das, Electrical Power Systems for Industrial Plants, Jaico Publishing House, Pages 540, 2008
Shoiab Khan – Industrial Power System, CRC Press
Soares Book on Grounding and Bonding, 10th ed. International Association of Electrical Inspectors

2010
Juran M Gers, Edward J Holmes, Protection of Electricity Distribution Networks, Pages 342,ed2.0, 2004,2010

2014
Turan Gonen, Electric Power Distribution Engineering ed 3.0, CRC Press
Thomas Allen Short, Electric Power Distribution Handbook (Electric Power Engineering Series ) ed 2.0,2014

Then Of course color books as mentioned by Dandel.

### RE: MV/HV Learning & Multiple Questions

I second Blackburn's relaying book. The only thing I don't like about it is that it contains typos. Blackburn's Symmetrical Components book is really good as well and was meant to be a sister book to his relaying book. Westinghouse or now ABB's Transmission and Distribution book is really good too but it doesn't contain anything to microprocessor relaying. Most of microprocessor relaying is based on the foundations that were set with mechanical relaying so I wouldn't get to hung up on that. The only book that I know of that is dedicated solely to microprocessor relaying is "Modern Solutions for Protection, Control, and Monitoring of Electric Power Systems" by SEL. It is an alright book but I reference SEL's white papers much more than I do digging through that book. IEEE Red book is really good for industrial stuff. The IEEE color books are moving over to DOT standard to collect and reduce the amount of duplicate material between the different color books (commercial, health care facilities, industrial, ect). You can't go wrong with anything on the recommend reference material for power engineers page that DavidBeech linked to. Most of the stuff can be had pretty cheaply if you watch Ebay. There isn't much that you should pay \$20-30 for at most. There is a lot that can be had for near the cost of shipping.

### RE: MV/HV Learning & Multiple Questions

600/5T is not something I'm familiar with. I would guess that is a typo.

There is a relaying accuracy class that uses a "T", as was mentioned above, e.g. T200, T400 versus C200, C400.

### RE: MV/HV Learning & Multiple Questions

(OP)
Thanks everyone for the great responses! Time to get to work!

### RE: MV/HV Learning & Multiple Questions

I would guess that 600:5T/3000:5 MR would mean the CT is set at the 600:5 Tap.

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