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Power disturbance-free quick-switching devices are primarily used in continuous manufacturing enterprises such as those in the petrochemical, coal, metallurgy, intelligent manufacturing, and biopharmaceutical industries. These enterprises have high requirements for power supply continuity; to ensure that production processes can continue without interruption and that sensitive loads do not stop operating, it is advisable to use such quick-switching devices. When there is a power fluctuation in the system, these devices quickly disconnect the faulty power source, depending on the system’s operational status. They then check the voltage quality on both sides of the circuit before connecting the backup power source, thereby ensuring that sensitive loads remain operational and that the system experiences no disruptions, allowing production to continue smoothly. As the most important electrical device in the power protection system, when selecting and configuring an automatic transfer switch, the following key factors need to be taken into consideration: 1. To ensure power supply safety and continuity, continuous production enterprises generally use two independent power sources. Before installing an automatic transfer switch, it is necessary to verify whether the capacity of these two power inputs is sufficient to support the total load on both busbars, thereby ensuring system safety during switching. If the capacity of one of the power inputs is insufficient, an intelligent load-shedding function should be considered when installing the transfer switch, so that less critical loads can be shut down during switching to ensure that critical loads can continue to operate. 2. In industrial environments, the load conditions are complex; to ensure fast switching speeds and reliability, the failure startup methods for such devices need to be comprehensive. The startup methods of the auxiliary power fast switching devices initially used in power plants were relatively simple, consisting only of manual startup, protection-driven startup, voltage loss startup, and fault-induced startup. In industrial applications, it is clearly insufficient; relying solely on voltage amplitude as a criterion for loss-of-voltage starting is not enough. The starting methods need to be expanded to include current-free starting, reverse-power starting, and starting in the event of abnormal frequency and voltage conditions. The DCM635G from Guogao Electric also features fitted starting, which enables faster and more reliable startup determination by predicting based on the fitting of discrete values in the voltage loss model. Therefore, when selecting a quick-switching device, the required starting methods should be considered, and it must be ensured that the device supports them. 3. The quick switching device shall have functions for normal switching, emergency switching, and switching under abnormal conditions. Normal switching should be bidirectional, allowing switching from the main power supply to the backup power supply, as well as from the backup power supply to the main power supply. At the same time, all switching functions should possess synchronization checking capabilities for pressure difference, angle difference, and frequency difference, to ensure the safety and stability of the switching process. 4. To ensure the safety of switching, various interlock protection functions must be comprehensive. The main ones include: interlock in case of abnormal switch position, interlock in case of backup power failure, interlock in case of PT wire breakage, direction overcurrent interlock, and interlock for busbar overcurrent protection. Additionally, the device should also have current protection functions for the busbar switch, an acceleration function after startup, and a decoupling function. The quick cut-off device should possess high safety performance and reliability to ensure that power can be cut off quickly and accurately in case of abnormalities, thereby protecting the safety of the power supply system, load equipment, and personnel. 5. Fast switching devices enable rapid switching on a millisecond scale; during this process, the accuracy of the time it takes for the switch to open and close is also important. As we know, the time required for a switch to open or close can change over time due to wear and tear, by several milliseconds or even tens of milliseconds. If it is not possible to accurately predict the operating time of the circuit breaker in situ, then the pre-activation time calculated using the system model will be inaccurate, which poses a risk of system shock at the moment of closing. Many fast switching devices available on the market rely on the initial setting values for switch opening and closing, which is a problem. The DCM635G can collect switch operation parameters and measure the timing of the closing circuit in real time; through big data modeling and dynamic configuration, it ensures precise control of the actuator units by the controller. When selecting a quick-switching device, all the above key factors should be taken into consideration to ensure that the chosen device can meet the actual requirements and exhibits good performance.