Cordinating Recloser loop schemes. 1

[Mbrooke]

Working on/ evaluating several projects that involve increasing overhead distribution reliability (spacer cable, hardware hardening, SCADA ect).


Does anybody know of any good documents/programs for setting the time-current and voltage response parameters in recloser pole mount controllers (that are part of a loop scheme) or has anybody had experience with this?

For the most part the time current curves look like they can be coordinated the same way as with other distribution devices (breakers, standard reclosers, fuses) However, Im not exactly sure how to set the loss of voltage response algorithms for the source sensationalizing and tie reclosers. Some of these loops will be in series with each other which makes it more difficult.

The goal behind it is to significantly reduce the number of customers that loose service from a downed pole, even if it is a main feeder from a substation.


Thanks!

 

[Mbrooke]

Any PDFs out there by recloser manufacturers? Cooper, Schweitzer, Siemens, GE?

 

[vandal06]

Shot in the dark here, but maybe there is something for you in this SEL app guide. "AG2004-09 Minimize Distribution Outages With High-Speed Automatic Network Reconfiguration Using SEL-651R Advanced Recloser Controls" You can get it off the SEL website.

https://www.selinc.com/literature/ApplicationGuides/

 

[Mbrooke]

Thanks!
That helped, you are one the right track.

Any thoughts from utility engineers?

 

[Mbrooke]

So far Ive come up with the following for loss of voltage response. During a permanent fault it takes about 20-30 seconds until the substation breaker runs out of re-close attempts (2 fast lateral fuse saver curves and 1 long curve to lock out). The source sectionalizing recloser times out at 35 seconds and trips on loss of source. Should the source come back before 35 seconds elapse the timing is delayed and then the timing is reset if the sources holds for over 10 seconds.

The tie recloser that will back feed this segment will be set to close after 45 seconds if all 3 phases remain denergized. A similar time reset sequence is there like with the source recloser if the line is restored before 45 seconds are up. If this line segment has a second tie recloser to complement the first one then it will be set to restore the segment at about 50 seconds.

In most cases there will be another 1000 customers (most likely residential) branching off the segment described above (with the source and tie) protected with another recloser. This branch recloser will be a source sensationalizing type set to trip out at 60 seconds for loss of voltage and a tie recloser downstream will close after about 70 seconds if this section of line is unfaulted.

I attached below a word doc on what a typical scheme will look like in a service area. I added the proposed LOV timing that I believe will work best for this.