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We have to extend an old project where relay protections in 20 kV switchgear are REF541/543. To keep the system similar new cubicles are equipped with the same REF541. Of course all installation of the software is missing (even that old laptop is scrapped) and I have to install it again. I use...

It depends of what is your scope of works - only CT/VT testing or also general plant commissioning. For plant commissioning I would suggest CPC100. CT-analizer is good if you are only in CT/VT testing, but with CPC you can do almost any test in the switchgears. ------------------------ It may...

I am control and protection designer, in our every day work we use several kinds of design software for circuit diagrams design and system modeling. But I am curious what kind of software is used for design of primary part of outdoor switchgears. There are very complicated problems related to...

scientif, where are you located, in Europe, or States ? If in Europe I would recomend also ABB and Sprecher Automation We are expecting a similar project, but from much smaller scale so I definitely know it is possible :-) ------------------------ It may be like this in theory and practice, but...

I would like to know about current practice for accreditation of inspection bodies acc. to IEC 17020. Who has a legal right to audit and issue accreditations ? If it is restricted only to national accreditation institutions or private ones can also obtain accreditation from "European...

My 2 cents too: We are doing secondary injection from the terminal block of first marshalling cubicle in the switchyard (closest to the CT's). We check (by clamp meter) where currents are flowing, and correct reading on relay protection displays and measuring instruments. That way all wiring...

Yes, I also think what DiscoP said is a good idea. We present in a similar way tripping logic of relay protections (in Tripping Matrix), so something like "GOOSE Matrix" would be OK. But I am still curious how this matter is solved by other collegues. Actually I never have seen in design of...

I posted this question on another forum, but still there is no much activity there. My case is following: I have a project now where I am going to realize part of protection logic by GOOSE messages between relay protections on different bays. Logic itself is not very complicated, no problem to...

Thank you Scotty. I suspect similar problem, but cannot be sure without expert consulting. I already sent question to Programma Electric/Megger and hope to receive advice from the manufacturer. By the way, we have local Bulgarian manufacturer of test sets. It happens that I was the relay...

I need advice from colleagues with experience relay protection tester FREJA 300 from Programma Electric. Tester is more or less OK for our needs, but we have very unpleasant problem with communications to it. Connection to the tester is via COM port only. In some days connection is established...

Another version of the acronim: SAS = Special Air Service. Very respected unit ! Seriously speaking - from my experience on projects with Siemens and AREVA they have separate departments for SAS. Actually they have to coordinate their work with secondary connection designers on design stage and...

Thank you matthewm1965 and Slava ------------------------ It may be like this in theory and practice, but in real life it is completely different. The favourite sentence of my army sergeant

For current tender we have to offer extension of mosaic type control panel in existing substation. Could somebody advice me where to find manufacturer of components for such panels? Project is in Europe. Unfortunately we are just subcontractors, but during the site visit the Main contractor's...

My opinionion is also that separate trip relays (high-speed, high DC current breaking => high expensive) are not necessary now. But they are still required in tender documents and/or in utility requirements, so we continue to put them in new projects. Some time ago I used another, much cheaper...

Thank you TLCPA. MV bus is labeled 52 kV, but this have to be isolation level. I don't know why the switchgear is for 52 kV - I entered the project on the very last stage, just for relay protections settings. Bus works on 27.5 kV and your calculation matches my results and Gunnar's...

Thank you, I have a similar result by hand calculation, but was not sure also if I correctly transformed 3-phase to 1-phase systems. Now it seems that mistake is not mine. This is typical system in Bulgara, but I work for a first time for railways. Our usual field are utilities - www.triel.bg...

Thank you Gunnar, Attached is SLD - actually some mix of 3-line and 2-line diagram. Important for me is SC level on 27.5 kV busbars - I would like to check my calculation for busbar's SC, next points along the grid are not a problem. ------------------------ It may be like this in theory and...

With a current project I have some problem with customer engineers about SC current level on MV side of railway substation. It is existing substation, where I have to calculate relay protections settings and to set-up relays. Scheme is following: Busbar 110 kV, 3-phase SC current 16.3 kA (3420...

DiMiTKo, is it for Voluyak s/s ? ------------------------ It may be like this in theory and practice, but in real life it is completely different. The favourite sentence of my army sergeant

You have to install MiCOM Studio. Part of the package is Data Model Manager. Start it and connect to areva-td ftp-server. You can choose which data models you need (totally they are over 2 GB). ------------------------ It may be like this in theory and practice, but in real life it is...