为核心的自动控制器和带机电联锁的控制机构，是一种性能完善、安全可靠、自动化程度高、使用范围广的双电源自动转换开关。
  双电源自动切换开关适用于交流50/60Hz、690V及以下，额定电流自6A至1250A及以下的两路电源(常用电源N和备用电源或发电机电源R)的供电系统中，因一路电源发生故障(停电、欠压、过压、断相、频率偏移)而进行电源之间的自动切换，以保证供电的可靠性和安全性，实现无人值守连续供电。
  双电源自动切换开关安全操作规程步骤如下：
  1、当因故停电，且在较短时间内无法恢复供电时，必须启用备用电源。步骤：
  ①切除市电供电各断路器(包括配电室控制柜各断路器，双电源切换箱市供电断电器)，拉开双投防倒送开关至自备电源一侧，保持双电源切换箱内自备电供电断路器处于断开状态。
  ②启动备用电源(柴油发电机组)，待机组运转正常时，顺序闭合发电机空气开关、自备电源控制柜内各断路器。
  ③逐个闭合电源切换箱内各备用电源断路器，向各负载送电。
  ④备用电源运行期间，操作值班人员不得离开发电机组，并根据负荷的变化及时调整电压、厂频率等，发现异常及时处理。
  2、市电恢复供电时，应及时做好电源转换工作，切断备用电源，恢复市电供电。
  步骤：
  ①按顺序逐个断开自备电源各断路器，顺序是：双电源切换箱自备电源断路器→自备电源配电柜各断路器→发电机总开关→将双投开关拨至市电供电一侧。
  ②按柴油机停机步骤停机。
  ③按顺序，从市电供电总开关至各分路开关逐个闭合各断路器，将双电源切换箱自市电供电断路器置于闭合位置。
  3、检查各仪表及指示灯指示是否正常，启动变压器内冷却风扇

Double power supply automatic switching switch           The utility model relates to a double power supply automatic switching switch, which is a double circuit power supply switch. Double power automatic switch as actuators, with automatic controller using MCU as the core and the mechanical interlock control mechanism is a dual power supply, perfect perbance, safe and reliable, high degree of automation, the use of a wide range of automatic conversion switch.           Double power automatic switch for AC 50/60Hz, rated current 690V and below, from 6A to 1250A and the following two power supply (common power supply N and standby power supply or power generator R) power supply system, due to a power failure (power failure, overvoltage, undervoltage, open phase and frequency offset) and automatic switching between power supply, to ensure the safety and reliability of power supply, power supply to achieve continuous unattended.           Double power supply automatic switch safety procedures are as follows:           1, when the power outage, and in a short period of time can not restore power supply, must enable the standby power supply. Step:           The removal of electric power supply of each circuit breaker (including the circuit breaker control cabinet, power distribution room dual power switch box power supply breaker), open the double throw switch to the prevention of back power supply side, keep the double power supply switching power supply box self breaker is in off state.           Start the standby power supply (diesel generator set), when the standby group is running normally, turn off the generator air switch and the circuit breaker in the control cabinet.           The power supply circuit breaker of each power supply is switched off by the power supply switch box.           During the operation of standby power supply, the operator on duty shall not leave the generator set, and adjust the voltage and the frequency of the plant in time according to the change of the load.           2, the city to restore power supply, should do a good job in a timely manner to power conversion, cut off the standby power supply, restore power supply.           Step:           The sequentially disconnect power supply of each circuit breaker, the order is: dual power supply switching power supply circuit breaker box, power distribution cabinet, each circuit breaker switch, the generator double throw switch to electric power supply side.           According to the diesel engine shutdown step down.           According to the order, the main switch of the power supply of the city is connected to each branch switch to close the circuit breakers one by one.           3, check the instrument and indicator light is normal, start the transber cooling fan.