Zellweger is the brand name of an electric switching device also known as a Ripple Control Receiver used to control off-peak electrical loads such as water heaters by switching these loads OFF over peak energy use times of the day and switching them ON after peak energy use times of the day, hence the term 'off peak' control. It is an example of carrier current signaling. The Ripple Control Signal is generated at substations owned by Electricity Supply Authorities (as distinct from Electricity Generating Authorities) connected to the High Voltage transmission grid and injected into the Medium Voltage transmission grid at 11kV, 22kV, 33kV and 66kV, through a Coupling Cell consisting of a tuned L-C circuit (Tuning Coil - Capacitor). The Coupling Cell enables the Ripple Control Frequency to b
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| - Zellweger is the brand name of an electric switching device also known as a Ripple Control Receiver used to control off-peak electrical loads such as water heaters by switching these loads OFF over peak energy use times of the day and switching them ON after peak energy use times of the day, hence the term 'off peak' control. It is an example of carrier current signaling. The Ripple Control Signal is generated at substations owned by Electricity Supply Authorities (as distinct from Electricity Generating Authorities) connected to the High Voltage transmission grid and injected into the Medium Voltage transmission grid at 11kV, 22kV, 33kV and 66kV, through a Coupling Cell consisting of a tuned L-C circuit (Tuning Coil - Capacitor). The Coupling Cell enables the Ripple Control Frequency to b (en)
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| - Zellweger is the brand name of an electric switching device also known as a Ripple Control Receiver used to control off-peak electrical loads such as water heaters by switching these loads OFF over peak energy use times of the day and switching them ON after peak energy use times of the day, hence the term 'off peak' control. It is an example of carrier current signaling. The Ripple Control Signal is generated at substations owned by Electricity Supply Authorities (as distinct from Electricity Generating Authorities) connected to the High Voltage transmission grid and injected into the Medium Voltage transmission grid at 11kV, 22kV, 33kV and 66kV, through a Coupling Cell consisting of a tuned L-C circuit (Tuning Coil - Capacitor). The Coupling Cell enables the Ripple Control Frequency to be superimposed on the 50 Hertz (Hz) mains frequency, which promulgates into the 415 V 3 phase power distribution lines providing energy to industrial and domestic customers of the Electricity Supply Authority. To avoid problems with other equipment connected to the distribution system; i.e. industrial machinery and domestic appliances, the ripple frequency is selected to be offset from the third harmonic and its multiples, typically starting at 167 Hz and including , 217, 317, 425, 750, 1050, 1650. The choice of frequency depends upon the density of the load into which the ripple frequency is to be injected and the length of the distribution Work in progress -- will come back to this Power stations transmit a on the main transmission lines when off-peak rates start (often around 10 pm). This ripple noise is picked up by the Zellweger, which after a random delay turns the hot water heater on. The noise is often picked up by other equipment, especially audio amplifiers and stereos and the noise can cause problems with other electrical devices. It is especially audible from ceiling fans running at low speed. Even some telephone lines can pick up the noise. The noise can be particularly obtrusive from some fluorescent light systems, as well as ELV and LED lights. Newer electrical meters incorporate this technology into the meter. "Time of use" meters charge electricity to the current tariff within half an hour, giving customers incentive to run appliances such as dishwashers, pool pumps and clothes dryers during the night. (en)
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