On Fri, 2005-10-07 at 11:35 +1300, Chris O'Halloran wrote:
Every second for 5 minutes! Hmm, struggling to think of a disturbance scenario that would last for 5 minutes.
To me that rules out motor starting. Unless it's a sewerage pumping station working overtime to keep up with
The fact that it's isolated to this particular time frame has got me thinking. Weatherwise, it did pour down at this particular time... http://gamma.wired.net.nz/wx200/Week.html#Rate_Week the extra amount of water overflowing into the sewerage. (Please note overflowing - I'm not making a statement that storm water goes into the sewerage system because it doesn't.)
injection signals from power company equipment. voltage depressions caused by short circuit faults on other circuits. and Gavin doesn't report that there were frequency excursions.
Curious, if you're sure the supply is free of harmonics, it's got me wondering about self healing insulations faults. Was it wet on the night in question? Cracked insulators or XLPE cable can exhibit self healing behaviour ie the partial fault current arc dries out the arc path improving its resistance or the arc energy melts the XLPE void and restores the insultion property.
Yeah... :) More than likely... :) Now, how old is your house Kyle ? :) Any roof leaks ? :) Did this happen again on Tuesday and Wednesday night ?
Well, must get back to work.
Nah, it's Friday... Time for a beer...:)
Chris