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G04C15/0063—Synchronous clock systems, e.g. provided with radiolink or using transmission of alternating current via existing power distribution lines
G04C15/0081—Automatic stabilisation of net frequency with regard to time, e.g. by comparing one of the clocks with an independent clock, means being provided for automatic compensation of disturbances
Einrichtung zur selbsttaetigen Regelung eines ueber einen Drehtransformator aus einem primaeren Wechselstromnetz schwankender Frequenz gespeisten sekundaeren Wechselstromnetzes auf konstante Frequenz