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Hello friends, a question for IEC 61850 people. According to the IEC 61850 standard (Ed. 1), the Autorecloser logical node should report in the data object AutoRecSt: 1 if Ready 2 if In progress 3 if successful Edition 2 of the standard says: 1 if Ready 2 if In progress 3 if successful 4 if...

thread238-263107 There was a question on how to send GOOSE messages between different vendors

I would like to inform all of you about this course: http://www.stri.se/metadot/index.pl?id=9332&isa=Category&op=show I am planning to be there, I hope I will see some of you.... just try to wear a green tie :-) or invent a sign so that we can recognize each others... It will be cool! By the...

Hello, I have a question: does anybody know if the IP address of the IED "sender" is available in the GOOSE data stream? In 99% of the cases, the network analyzer (Ethereal) does not show the IP address of the IED sender, it only shows the MAC address of its ethernet port. BUT sometimes...

Is anybody using injection of Comtrade files for testing power swing and/or pole slip? If yes, why and how? I am talking about commissioning tests, not acceptance tests or performance tests or type tests...

Regarding the CT grounding issue: Is it better to ground (connect to earth) the CT, serving a line protection for instance, towards the line or towards the busbar? And for transformer protection (differential), should the CTs grounded towards the transformer or towards the feeders? Any...

Is there any commonly accepted formal word to denote the followings: - Protection Relay or Protectiove Relay or others? - Relay Engineer, or Power Protection Engineer or Protection Engineer.. what else? - Operate time or tripping time or operating time or what more? - Starting signal, start...

Hello to all of you... have you seen this? http://iec61850.blogspot.com/

I would like to consider again this issue: What does testing a numerical relay mean? Why do we do it? What happens if the relay fails a test? Which kind of tests are required for digital relays and what is their purpose? (for example: function test like overcurrent or distance protection tests...

What is the voltage we still require today at a test set (current output) for being able to test the most difficult electromechanical relay? I am out of mechanical relays since years, but in the US there are a lot of them. Do you have please some data in terms of VA, or max voltage requested to...

We are trying to create an amplifier for injection of comtrade files (or anyway power system waveforms) into the numerical relays. The question now is: what should be the frequency response of the amplifiers? I have done a lot of thoughts, and I will post them here, but not now, as I might be...

Just wanted to inform all of you about PAC website: Protection Automation and Control Community. It should be more dedicated to protection relays than this, wonderful, site. I couldn't find any forum there, maybe it will come? http://www.pacw.org/home.html

All the manufacturer (to my knowledge so far) give the static accuracy of the distance protection relay at the reach point, at line angle. In practice the tolerance is not defined for all the characteristcs (unless you take the accuracy data for voltage and current measurement, and get crazy to...

I will repost this thread as the first one was clearly misunderstood. I have then to be more explicit, and this unfortunately will probably limit the discussion field. The question is only technical. "People" believe that the relay is a perfect equipment, from the power system protection point...

One friend of mine on day told me... "do you know why I am replacing all my electromechanical and static relays with the numerical ones?" I answered: "the old ones are broken and you don't get the spare parts, maybe?" He said "no, no, the old relays are working perfectly. That's not the...

For several years again we will have substations equipped with numerical, static and electromechanical relays, from different manufacturers. Apart for the fact that people get crazy, what are your guidelines for such type of testing? Do you differentiate the methods and the time interval for the...

Which kind of Comtrade Viewer do you use? Do you have any good recommendation for, eventually, freeware viewer? I am not just talking about a viewer... it should also have some technical features like: operation among analog channels (sum product, maybe my own formulae), phasor representation...

After several and repeated bad experiences, I would like to draw your attention on this aspect regarding the "new" methods of testing numerical relays. The testing engineer goes in front of the relay and gets the RIO file from the relay. It imports the RIO file from the test-set software. It...

Anybody knows about Heavisude-Giorgi Operator, called "p" as far as I managed to understand?

If one part of the network is weak, we can have electromechanical oscilaltion phenomena. Is it really true that: one side of the circuitbreaker runs with 60 Hz and the other side "runs" at: (60 Hz - 20 mHz) + frequency oscillation with a period of 1 second of +/- 50 mHz? Which means that the...