On 08/04/2011 10:31 AM, Poul-Henning Kamp wrote:
In message<E9DFD046D648474891D49E82D6BD94E8@cyrus>, "Bill Hawkins" writes:
Could you please explain how transformer phase lags could jump?
When one power plant ramps up and another ramps down, the power flow
reverses in some transformers and transmission lines.
If the shifts you see has this cause, you should see them in both
directions over time (weeks, months).
Notice how the big jumps down matches the beginning of the steep
direction down. It is interesting to note that there is also a tendency
for the diff curve to go down even for the upward direction.
Notice how the diff moves upwards only occasionally and with a much
smaller amplitude.
Could there be a systematic cycle slip one one of the sites?
I would hook up the probes on the same site such that they see the same
signal to see if there is a difference between them.
Cheers,
Magnus
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