Views: 10 Author: Site Editor Publish Time: 2022-11-12 Origin: zhihu
Dual power supply means dual circuits. If one main line fails, the automatic transfer switch can automatically enable the other line to supply power to the load. The most common is to use the mains all the way and the generator all the way. At present, there are two different substations that are used more and come to the mains.
Generator automatic transfer switch device (ATSE) is mainly used in emergency power supply system. When the main transfer switch automatic is cut off, overvoltage, undervoltage, or lack of phase, ATSE can automatically transfer the load circuit to the backup power supply. Re-energize the main power required by the load (main power is off, and the ATSE can also automatically start the genset).
Generally, the automatic transfer switches can be used in places where power failure is not allowed. In particularly important power-using occasions, three power sources are used (such as the communication center room with at least three power sources, one DC UPS power supply, one or two mains, one Diesel generator sets) to ensure continuous and reliable operation of important loads.
Special or first-class load users specified by the state, such as high-rise buildings, post and telecommunications, coal mine ships, industrial assembly lines, medical and health, military equipment, airports, fire protection, metallurgy, chemical industry, textiles, petroleum and other important places where power outages are not allowed.
The three-phase phase sequence of the automatic power transfer switch and the two power supplies should be the same, otherwise the three-phase load of the motor will be reversed to avoid losses.
The dual power automatic transfer switch has a delay when switching the standby power supply, and some electrical equipment has strict requirements on the conversion time of the dual power automatic transfer switch. Therefore, when selecting the ats automatic transfer switch, you must be optimistic about electricity Whether the conversion time of the device meets the requirements.
If you also install ups (uninterruptible power supply) to supply power to important equipment, it should be installed behind the dual power switch to ensure uninterrupted power supply.
ON-OFF Type means that the dual power automatic transfer switch can only be connected to either a common power supply or a backup power supply.
ON-OFF-ON type means that the generator automatic transfer switches have three positions, which are connected to the common power supply, connected to the backup power supply, and not connected to the common power supply nor the backup power supply (double split).
When the equipment needs to be serviced or completely disconnected from the power supply for testing, the three-stage type is a better choice. The switching time of the two-stage type is faster, and there is no intermediate position, but it is not conducive to arc extinguishing.
Self-switching and self-recovery: when the main power supply is normal, the main power supply is automatically switched on, and the backup power supply is on standby. When the main power supply loses power, the control device disconnects the main power supply circuit breaker, closes the standby power supply, and supplies power from the standby power supply; when the main power supply resumes power supply When the control device disconnects the backup power circuit breaker and closes the main power circuit breaker, the power supply of the main circuit breaker is restored. It is the priority to use the common power supply. (diesel generator as backup power source)
Self-switching and no self-recovery: When the main power supply is out of power. Switch to backup power, then don't switch back unless manually switched back.
Mutual backup, that is, which of the two power supplies has power and which one has no priority, whichever can be used. If it's broken, replace it with a good one.