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from the you're-not-just-bored:-the-wall-clock-IS-slow dept.
Electric clocks on continental Europe that are steered by the frequency of the power system are running slow by up to 5 minutes since mid-January according to a news release from the European Network of Transmission System Operators for Electricity ('entsoe'). The transmission system operators (TSOs) will set up a compensation program to correct the time in the future.
Many electric clocks rely on the transmission system frequency to provide a source that minimises long-term drift. Quartz crystals have good short term stability, but dreadful long term stability, so plant and machinery that requires power to be turned on or off at a specific time each day without maintenance over a long period historically used clocks slaved to the power-system frequency, which is kept long-term stable by the system operators to prevent problems in power generation and transmission across national and supra-national grids - for example, attempting to switch supplies to generators that are not synchronised to the grid frequency can severely damage the generator.
It is normal for transmission system operators to allow the frequency to drop slightly at periods of high demand, thus slowing clocks, but usually, the frequency is increased during periods of low demand to ensure the long-term average frequency remains stable.
(Score: 2) by frojack on Tuesday March 06 2018, @10:56PM (1 child)
DC long haul power lines are becoming a thing, as large scale EFFICIENT converter plants are becoming feasible.
Lots of DC lines are used in offshore Wind Turbines because AC underwater cables are so lossy.
They put the converter stations on-shore to feed the grid.
No, you are mistaken. I've always had this sig.
(Score: 2) by RS3 on Wednesday March 07 2018, @03:54AM
HVDC has been a thing for a long time: https://en.wikipedia.org/wiki/High-voltage_direct_current [wikipedia.org]