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机关、学校的配电房大多数无人值班,要想集中控制照明,只好用远距离控制。一是将电源线引至电话室或广播室,由话务员或播音员兼管控制照明,这样既增多了照明线路,又很不美观,还增加了电力损耗;二是用控制电缆或动力载波设备来实现远距离操作。若用控制电缆实现远距离控制,距离短还可以,若距离较长时,控制电缆中的电压降会影响交流接触器的正常工作。当使用动力载波设备控制时,会增加维修困难,而且以上方法均需人工操作,对要求送电准时的教室、宿舍照明,更增添了操作人员的麻烦。为了实现教室、宿舍、路灯等公共场所的照明自动控制,我们将J83-1作息时间自报钟的电路加以改装(如图中虚线部分所示),达到了自动控制的要求。节约了人力和电力,有一定经济价值。工作过程:参见电路原理图,例如,当需要5点20分接通照明电路,7点30分断开照明电路时,即将带二级管的联线按图分别接于背面接线柱上,J_3继电器z端接在30分接线柱上。然后接通电源,
Most of the power distribution houses in institutions and schools are unattended. In order to centralize lighting control, they have to use remote control. First, the power cord is led to the telephone room or the broadcast room. The operator or the announcer concurrently controls the lighting. This increases the number of lighting circuits and is unattractive. It also increases the power loss. The second is the use of control cables or power carrier equipment. To achieve long-distance operation. If the control cable is used to achieve long-distance control, the distance can be short. If the distance is long, the voltage drop in the control cable will affect the normal operation of the AC contactor. When the power carrier equipment is used for control, it will increase maintenance difficulties, and the above methods all require manual operation, which adds to the operator’s troubles in lighting the classrooms and dormitories that require power transmission on time. In order to realize the automatic control of lighting in classrooms, dormitories, street lamps and other public places, we modified the circuit of the self-reporting clock of J83-1 (as shown by the dashed line in the figure) to meet the requirements of automatic control. It saves manpower and electricity and has a certain economic value. Working process: See the circuit diagram. For example, when it is necessary to switch on the lighting circuit at 5:20, and the lighting circuit is switched off at 7:30, the connection line with the diodes is connected to the rear terminal block as shown in the figure. J_3 The relay z is terminated on a 30-minute binding post. Then turn on the power,