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method for switching between straßenverkehrsanlagen from day to night
method for switching between straßenverkehrsanlagen from day to night
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机译:从白天到晚上在大街上切换的方法
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摘要
The traffic lights can be switched between daytime and night-time modes in which the voltage to the signal lights is adjusted accordingly so that the intensity of the lights is increased for daytime viewing. The voltages (U, U2) are supplied from respective tap-offs of a transformer. The switching from the higher daytime voltage (U1) to the lower night-time voltage (U2) is effected via an intermediate zero voltage phase (t3..t4) the duration of which is at least one half wavelength of the AC supply.
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