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Enron Mail |
Karl,
Thanks a lot. I have passed this information to Grant Masson who worked here on a related problem. He will get in touch with you regarding this technology. Vince Karl Tomlinson@ENRON_DEVELOPMENT 07/24/2000 06:00 PM To: Vince J Kaminski@ECT cc: Subject: Outage Tracker Option And Background Vince, To follow up on the idea of a means for effectively tracking instantanious plant faliure utilising either system frequency or connection point voltage. The system frequency phase shift across a network will probably be the best option as this would allow alll significant deviations to be tracked along with relative network performance from a few points. I am currently chasing NEMMCO (AU system operator) to get hold of a few weeks of 4 second metering data for the whole system to see if there is enough measurement consistency to prove one of the ideas. The idea follows along the lines (literally !) that when a unit fails it will introduce a shock into the system and reduce system frequency, which is then reacted to by frequency control services offered in by generators. The drop in frequency is noticable across the whole network and as one option may change the phase shift across the whole grid. The phase shift across the network is constantly changing due to loads and power factor correctrion devices switching on and off, however a unit failure may be distinct. The second option relates to how a unit fails, whereby if a circuit breaker is involved as in the case of uncontrolled shutdowns, then the outage will cause an RF pulse that should propogate across some of the network. Transformers will attenuate the pulse, however it should be detectable many miles away from the fault location. Measure the arrival time at several point on the network, work out the shift and backtrack on the network. Part of the solution is already proven in lightning trackers. The solution may be made more simple by detecting the exact point on the sinewave that the unit failed (i.e. measuring the three phases at 1MHz and then sending the data through a DSP). This solution is more complex, however this should allow unit failure to be pinpointed to a station. The timing base for each of the nodes may be sourced from GPS timing, self locating at the same time ! Will send you some links and documents for potentail hardware and setups. Karl.
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