1、 Application and classification of dual power conversion switch The dual power automatic transfer switch is mainly used in emergency power supply systems to automatically switch the load circuit from one power source to another (backup) power source, ensuring the continuous and reliable operation of important loads. Therefore, dual power automatic transfer switches are often used in important power plants, and their product reliability is particularly important. The controller of the dual power automatic transfer switch simultaneously detects two voltages/currents, and judges overvoltage for power voltages higher than the rated value (adjustable) and undervoltage for power voltages lower than the rated value (adjustable). The microcomputer control circuit makes logical judgments on the above detection results, and the processing results are driven by a delay (adjustable) circuit to issue opening or closing instructions to the electric operating mechanism. The dual power automatic transfer switch generally consists of two parts: Switch body+controller And the switch body is divided into PC level (integral) and CB level (circuit breaker). PC level: ATSE capable of connecting, carrying, but not used for breaking short-circuit currents. Its main body is the load (isolation) switch, which is an electromechanical integrated switchgear, and the conversion mechanism is driven by a motor or excitation. CB level: ATSE equipped with overcurrent release, whose main contact can be connected and used to break short-circuit current. Equipped with mechanical interlocking devices for circuit breakers (miniature circuit breakers or molded case circuit breakers). The controller is mainly used to detect the working condition of the monitored power supply (two channels). When the monitored power supply fails (such as any phase loss, undervoltage, voltage loss, or frequency deviation), the controller issues an action command, and the switch body automatically switches from one power supply to another with the load.

Working principle of dual power automatic transfer switch After entering the working state, the controller will automatically sample the various voltages of the two power supplies and calculate the effective values of each voltage. Based on the set data, the microprocessor will make various judgments and processes. The processing results will be sent to the operating mechanism through a delay (adjustable) driving circuit to issue opening or closing instructions. By controlling the forward and reverse rotation of the motor, the switch can be switched between normal, standby, and double open. The fault condition can be reflected by LED digital tubes and indicator lights A dual power distribution box has two power sources (each input from two transformers), and when one power source fails, the other can be immediately put into use. However, a typical distribution box only has one power source. The dual power switch is a switch that automatically switches to another power source when there is a power outage due to unforeseen circumstances. The general dual power switch is widely used in important places such as high-rise buildings, residential areas, hospitals, airports, docks, fire protection, metallurgy, chemical industry, textiles, etc. where power outages are not allowed. The difference between dual power supply and dual circuit Dual circuit power supply generally refers to a load with two power sources, which are connected to different switches in the higher-level distribution station. During normal operation, one of the power sources is used for power supply, while the other is in a backup state; When a power outage occurs, the automatic switching device on the user side switches the power supply to ensure uninterrupted power supply to the load; Dual power supply generally refers to two power sources coming from different substations (or distribution stations), so that there will be no situation where both power sources lose voltage at the same time. This mode is generally used for particularly important user power supply, such as airports, train stations, hospitals, etc