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Overview of how it works
Automatic transfer switching equipment is abbreviated as ATS, which is the abbreviation of Automatic transfer switching equipment. ATS is mainly used in emergency power supply systems to automatically switch load circuits from one power supply to another (standby) power supply to ensure continuous and reliable operation of important loads. Therefore, ATS is often used in important places where electricity is used, and its product reliability is particularly important. Once the conversion fails, it will cause one of the following two hazards. A short circuit between its power supplies or a power failure of an important load (or even a short power outage) will have serious consequences. This will not only bring economic losses (stop production, financial Paralysis), may also cause social problems (putting life and safety at risk). Therefore, industrially developed countries have listed the production and use of automatic transfer switching appliances as key products to restrict and regulate.
ATS generally consists of two parts: switch body + controller. The switch body is divided into PC level (integral type) and CB level (circuit breaker).
1. PC level: one-piece structure (three-point type). It is a special switch for dual power switching. It has the advantages of simple structure, small size, self-interlocking, fast switching speed (within 0.2s), safety, and reliability, but it needs to be equipped with short-circuit protection appliances.
2. CB level: ATS equipped with overcurrent release, its main contact can be connected and used to break short-circuit current. It is composed of two circuit breakers and mechanical interlocking, with short-circuit protection function;
The controller is mainly used to detect the working conditions of the monitored power supply (two circuits). When the monitored power supply fails (such as any phase loss, undervoltage, loss of voltage or frequency deviation), the controller sends out an action command and switches The main body automatically switches from one power supply to another with a load. The capacity of the standby power supply is generally only 20% to 30% of the capacity of the common power supply. Figure 1 is a typical ATS application circuit. The controller is connected with the inlet end of the switch body.