Guide to coordinate autorecloser with downstream fuses - 13.2kV network 3

[JuanBC]

Hello,

I am wondering if anyone has a "guide" to perform coordination between an autorecloser (ABB RER615) and downstream fuses, in a radial 13.2 kV aboveground network.

Many thanks,
JBC

 

[Mbrooke]

There is this for free:

http://www.sandc.com/en/support/coordinaide/

https://www2.sandc.com/support/coordinaide/

http://www.cooperindustries.com/con...s/resources/library/240_Fusing/TD132010EN.pdf

S and C also has good PDF regarding that, I will have to find them.


This is more recloser to recloser, but still some good ideas:

https://conferences.wsu.edu/forms/h...m6/CooperForm6ProgrammingGuide_S280-70-21.pdf

There are also these which are more a synopsis of the basics and give examples:

http://www.feca.com/Line Protection.pdf

https://www.eiseverywhere.com/file_...c35c1a679_2016HORSAvistaDistributionPaper.pdf

https://www.sandc.com/globalassets/...s---all-documents/technical-paper-766-t84.pdf

Cooling curves if ever needed:

https://www.sandc.com/globalassets/...s---all-documents/technical-paper-200-t76.pdf

TCCs:

https://www.sandc.com/globalassets/...--all-documents/instruction-sheet-766-576.pdf

https://www.sandc.com/globalassets/...ll-documents/information-bulletin-766-211.pdf

 

[JuanBC]

Thank you very very much Mbrooke! I should start reading ahah!

Regards,

JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"

 

[jghrist]

See FAQ "What are good references for power engineers", especially Electrical Distribution System Protection by Cooper Power Systems. A practical guide to distribution system protection, also now available in an updated version.

You need to decide between a "fuse saving" and a "fuse blowing" philosophy. With fuse saving, you want a fast first recloser trip to keep tap fuses from blowing on temporary faults, at the expense of having more momentary outages on the main line. With fuse blowing, you want tap fuses to blow before the recloser trips, meaning fewer momentary outages on the main line but more permanent outages on taps.

 

[JuanBC]

Hi jghrist,

I did not know about that FAQ! Will take a look

Thanks!

JBC
.......
"The more I read, the more I acquire, the more certain I am that I know nothing"

 

[RRaghunath]

I prefer fuse blowing scheme if fuses are at the primary terminals of the field transformers. The reason is that fault in transformer can never be transient.
The same goes with the fuse that is protecting a downstream cable.

Rompicherla Raghunath

 

[Mbrooke]

@Jghrist: I beg to differ. You can have both- bake a cake and eat it too. You can use SCADA to deploy fuse saving on blue sky days and fuse blowing on stormy days. It works out well as faults are more likely to be permanent on blue skies and less so on stormy skies. It balances out well in most cases. You can also use high speed re-closing for lightning protection. That is closing back in only after a few cycles on the first trip. While it increases the odds of a permanent fault re-striking requiring another open-close, it takes care of lightning strokes and other faults such that the brief interruption usually does not result in clocks blinking due to the capacitors carrying them over. Here is what I mean from this thread:

https://www.eng-tips.com/viewthread.cfm?qid=428164

I am going to be honest: I don't know for sure. I know this is about the most arbitrary answer one can give, but I just do what "feels" right. Around here its typically 1 second open after trip, 10 seconds after trip and then 30 seconds after trip. But I have seen distribution guys do all sorts of open interval times like 30 seconds open on the first trip and then 60 seconds open. Heck I've seen 90 seconds on a first try. But, one thing that history and operating experience has taught POCOs is that in terms of customer satisfaction its best to have the first open interval as short as practicable; 1/4- 1/2 seconds has been done and tried with success to my knowledge. Reason being that roughly 2/3 of all temporary faults will clear and not re-strike when energized in this short amount of time. Yes a temporary fault is more likely to strike back up with a 1/2 second open time interval vs a 10 second open time interval -HOWEVER- for every temporary fault that could be cleared 100% of the time with a 10 second open there is a 65-70% chance a temp fault will be cleared with a 1/2 second open. A 1/2 second interruption often prevents blinking clocks and other noticeable events where a 10 cycle would become evident. Being able to eliminate 2/3 of all electronic resets on customer equipment is generally seen as good business. You would be surprised how many people do not have battery backup on their alarm clocks even though the capability is there. 1/2 second has also been known to work well for lightning strokes to my knowledge.

There is also the S&C Tripsaver cutout recloser and this:

https://www.youtube.com/watch?v=4xiHL5YWNcQ

 

[prc]

Recently there was a pole mounted distribution transformer explosion in a remote village in India where people got injured from burning oil. From the limited data available I concluded that the primary fuse did not work and the fault was isolated from remote sub station. Since the current recorded was quite high, I concluded that there was a primary line end fault inside the tank ( either line to tank or from winding top to core yoke) releasing enormous energy as the distribution grid is directly grounding with out the transformer reactance (a case if the fault were in secondary terminal area). This will release a dynamic wave from the gas generated and rupture the tank. My understanding from literature( let me admit this is not my core area) is- to prevent such dangerous situation, a rupturing fuse ( it will clear fault before the current wave reach its peak, there by limiting energy release inside tank to prevent rupturing) in series with an expulsion fuse. Wish to get expert's view on whether my understanding is correct. How auto-recloser segregate such dangerous fault condition to avoid tank rupture?

 

[prc]

Here are the books for Distribution Engineering:
Distribution Engineering

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,

http://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

 

[Mbrooke]

Current limiting fuse. I forget the value, but above a certain short circuit current the danger of the tank rupturing goes up.