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Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
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- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
Brain fried -- Core dumped
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We have an installation in Tunisia where a CHP plant is connected to a site bus via a 7MVA YNd11 transformer. In the protection relay settings the vector group Yd11 has been chosen but we appear to be having differntial trips. Is there a difference in phase shift between a Yd11 and a YNd11?
Anybody got any ideas. Email me on tfoster@centrax.eu.com
Anybody got any ideas. Email me on tfoster@centrax.eu.com
Responding to T. Foster's query... please answer the following:
1) Does the transformer trip upon energization?
2) Does the transformer trip at no-load or at a specific load?
3) Is the transformer provided with a tertiary winding?
Regards, Phil Corso (cepsicon@aol.com)
1) Does the transformer trip upon energization?
2) Does the transformer trip at no-load or at a specific load?
3) Is the transformer provided with a tertiary winding?
Regards, Phil Corso (cepsicon@aol.com)
Further to my 08-Oct (08:33) response:
4) Are transformer's wye-side CTs delta connected?
5) Are transformer's delta-side CTs wye-connected?
6) What is CT Amp-rating for wye-side current?
7) What is CT Amp-rating for delta-side current?
Regards, Phil Corso (cepsicon@aol.com)
4) Are transformer's wye-side CTs delta connected?
5) Are transformer's delta-side CTs wye-connected?
6) What is CT Amp-rating for wye-side current?
7) What is CT Amp-rating for delta-side current?
Regards, Phil Corso (cepsicon@aol.com)
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