It looks as though outside of the U.S. 61850 has been embraced. So far I don't see any huge problems with 61850. Looks like it is the future of substation design.
What I've read looks good, standardized simple data structure, self configuring devices, reduced wiring, ease of modifying...
Slavag,
1. Utility
2. Yes
3. Not my decision, I do not like 4 types of HW and SW but this would be for a new substation but will include a mix in older substations.
4. We will be using GOOSE.
Questions are never a problem.
DPC,
I will take a look at those tech papers on the SEL website.
Thanks.
We will be implementing this protocol at our substation and I would like to know what are some of the pitfalls to avoid.
Currently we use GE and SEL relays but we may move to Siemans and Abb since they seem to be the most versed in using 61850. We will be installing a redundant secure ethernet...
Pisimatza,
Unfortunately, bottom line your friend is right and you are not. You cannot measure and detect which phase is 'A'. The important thing as mentioned by many others is that 2 systems are in phase when interconnected.
As long as you have some sort of backup control IE: SCADA the local control switches are not necessary. We've done it at a few of our substations and have had very few problems. Most issues are with operator error. If the SCADA system is the main interface for both systems then that would be a...
To clarify, both sources are identical balanced 3 phase sources. Phases are designated by the letters A,B,C. The second source's (A'B'C') ground ref. is moved from N. to B'.
The measurements refer to voltage and phase prior to the ground change, and after the ground change. The drawing shows...
Sorry for the pic. not working, here it is in GIF format.http://files.engineering.com/getfile.aspx?folder=753a02f7-6f2b-4105-a521-a739bd897da0&file=VECTOR2.gif
See attached HTML dwg.
If I measure from A to A', B to B' and C to C' I read 0 vac and 0 deg. difference. AB = 115 vac, BC = 115 vac, AC = 115 vac 120 deg. apart.
After moving the ground to B phase (B') I measure from A to A', B to B' ; C to C' and read 67 vac and 180 deg. difference. The 2nd...
Why do the voltage vectors rotate 180 deg. when the ground is moved from the neutral to say phase 2. This is for wye connected phases??? Can't seem to wrap my head around this one. Thanks.
STEVENAL refereced IEEE C57.13.3:
We also follow this convention from the IEEE. It is important to have only 1 ground in the system. and the ground should be at the first point in the relay bldg. We do not ground at the breaker.
I would add, we follow this same guide for CCVTs/PTs. I find a...
Looking for if any relay testing requirements for power generation companies. Not sure if they are covered by NPCC or NERC. My initial thought is they are not.
Thanks in advance for any info.
As of today FP&L reported that human error caused this large blackout. Apparently 2 protection systems were defeated by a field engineer in the substation. Still makes no sense that other protection would not have limited the outage to a smaller area.
Any thoughts???
