Now that we know how the relay is connected to the outside world, it is time to look at its programming, compare the settings to the drawings, and see what we need to test.
Never look at the settings inside the relay unless absolutely necessary. You want to get as far away from the settings as possible. You can get settings from any of these sources (in order of preference):
- A description of operation from the engineer is the best solution as it describes, in words, exactly what the relay is supposed to do.
- Consider the coordination study to be the bible for overcurrent settings because if the relay doesn’t operate like the coordination study says it should, it’s wrong.
- The setting worksheet the engineer used to create the setting file is better than the setting file because you can see what the intended settings are to find typos and cut and paste errors.
- The setting file sent to you is far superior to the actual settings in the relay to eliminate any uploading error that may occur when programming the relay.
- The settings inside the relay are a last resort.
You can download the settings we used for this video here.
Click “Mark Complete” below after watching the video so you can keep track of your progress.
Hi Chris,
On the alarm hookup I thought I remember reading that unless your relay was hooked to a monitored SCADA system the maintenance schedule was shortened to 1 year.
Gary
Thanks for the comment. I just look at the NERC standard PRC-005-6 and it states “Any unmonitored protective relay not having all the monitoring attributes of a category below” Maximum Maintenance Interval = 6 Calendar Years.
One year would be wayyy better!
It is important to note that NERC only applies to organizations that actually fall under NERC and that these are minimum standards.
Hi Chris,
After clicking on “You can download the settings we used for this video here”. I am getting the info from https://valence.relaytraining.com/wp-content/uploads/trth-os1/downloads/TRTH-IT-B-OS-1-1-2.RDB but I can not read it with acSELerator. Please tell me how to make this file readable.
Thanks
Carlos
Thanks for the comment. I just downloaded the link and opened it with no problem. Have you updated your program? I’m running version 6.2.2.2
It seems to be an issue with Microsoft Edge. Later I did it with Chrome and worked fine..
Thank you
Hey Chris,
Have you ever encountered a scenario where the electromechanical reset 51GRS is not enabled and can you give an example of where a utility might use the instantaneous reset?
EM reset is usually turned off in new installations. The only reason to turn EM reset on is if there is, or was, an electromechanical relay upstream or downstream. A brand new substation usually wouldn’t have the EM reset turned on, for example. But it should be on if there is an EM relay in the next substation.
Chris
Where would get the check list guide you are using in this training course
There should be download links on course, lesson, or topic pages. All of the downloads for the seminars can be found here https://valence.relaytraining.com/groups/how-to-test-protective-relays-online-seminar-students/forum/topic/all-course-downloads/
Hi, I am not familiar with EM relays. Could you show an example of downstream/upstream EM relay with long time reset and the need for mimicking the EM reset in a digital relay in between? If it is required to simulate the EM reset, what are the other characteristics to consider beside setting YES/NO?
I happen to be recording E-M Testing for the upcoming seminar, so you can watch a normal E-M Relay trip at https://vimeo.com/582296433.
https://vimeo.com/582296405 shows a relay jogging itself closed. The same relay with the same settings and same current closed more than 2s sooner than it should of because there wasn’t enough time to reset between the applied current states.
Thank you for the video, the pulse ramping caused the relay to trip in about 360ms whereas the continuous setting @9A tripped at 2.9sec. So, this means that if a fast reset digital relay (w/o mimic) down the line after a slow reset EM relay will trip slower than the EM relay due to jog, thus causing more loss of load.
Thank you for allowing attachment now. Attached is a simple picture to illustrate what I understand from your explanation. I hope I’ve got it right.
Exactly right!
Thank you Chris.
Hi Chris, when I opened the the given setting file in AcSELerator, it displays in rows and columns like a table. It’s not showing like what you have in the video. Please advise. Thanks.
Seeing rows and columns means that either the relay settings are too old and SEL has decided that it’s not worth it to create an interface for, or you don’t have the updated driver for the relay settings.
Try updating your AcSELerator software and download the SEL-311C driver and see if that helps.
I also converted the relay file to a newer relay and overwrote the old file in that link. You can also try clicking on the button link in the topic and downloading the new file.
Otherwise, you can clicke here to download an rdb file for for a 351 relay with the same settings. Use the setting set that has “(use me)” at the end of the setting name
Thank you Chris. The link you have attached in the reply worked. FYI. I recently downloaded the AcSELerator.
Settings issued are not the same as the training module don’t think it would cause an issue but the latch bits are 16 and display points are 16 unlike the 1 and 3 from the video. Thank you for your efforts and making this for us.
Those darn setting engineers always screwing things up. 🙂 Good catch.