Automatic transfer switching equipment, known in English as Automatic Transfer Switching Equipment (referred to as ATSE), is mainly used in emergency power supply systems. It is a switching device that automatically switches a load circuit from one power source to another (standby) power source to ensure that important loads are continuous. Reliable operation.
On June 9, 2013, Yin Tianwen, Dean of the Shanghai Electric Apparatus Research Institute, pointed out at the general low-voltage electrical sub-conference of China Association of Electrical Equipment Industry Association 2013, sponsored by the General Electric Low-voltage Appliance Branch of the China Electrical Equipment Industry Association, that the current automatic transfer switch is increasing. Current, high rated limit short-circuit current, high mechanical/electrical life direction development.
As Professor Yin Tianwen put it, with the increase of requirements for relevant equipment in the power grid, the automatic transfer switch is developing to 4000-6300A high-current power supply level ATSE, and its rated short-term tolerance when using the category AC-33 (6Ie). Current Icw≥Circuit expected short-circuit current, Short-resistance time ≥Static universal breaker (ACB) short delay time (0.4s), Short-circuit connection capability Icm not less than 2-2.2Icw.
At the same time, the distribution-class automatic transfer switchgear is developing towards a high rated limiting short-circuit current (Iq). When the use category is AO-33 (10Ie), its rated limiting short-circuit current (Iq) ≥ the expected short-circuit current of the circuit, I2t> The I2t of the short-circuit protection electrical equipment; the electrical equipment of the load-level automatic transfer switch develops towards the high mechanical/electrical life. When the use category is AC-33 (10Ie), the mechanical/electrical lifetime value is higher than that of the MCB. , And meet a variety of load operation performance.
In addition, in order to meet market requirements, a dedicated static transfer switch (STS) has also been developed. Its load power-off time is less than 5-10 ms and is applicable to important fields such as communications equipment, rail transit, airports and military facilities.
Obviously, these tendencies of automatic transfer switching devices also require related technologies to be realized. The key technologies that need to be overcome include power synchronization and phase sequence detection technology, controller anti-jamming technology, overall solution for emergency power supply system (switching function and cooperation technology in the case of complex power supply), and static transfer switch (STS) technology.
Automatic transfer switching devices are often used in important places for electricity use, and their product reliability is particularly important. If the conversion fails, it will cause a short circuit between the power supplies or the loss of important loads. This will not only result in economic losses, but will also cause production pauses, financial slumps, and security problems. Therefore, the development of automatic transfer switchgear and technology is particularly important.
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