Dual power switching applications are also very wide. Let's take a quick look at how to use relays and contactors to achieve automatic switching.
The coil of the standby power source is taken away from the normally closed point of the main contactor, and the main power contactor is connected to the main circuit. The main power supply is de-energized, and the standby power supply is turned on through the normally closed point of the main contactor. If the main power returns to normal, the backup power is disconnected.
Of course, you can also use the contactor interlock to achieve, it is a little trouble, and what should I do when the main power supply and the backup power supply have electricity at the same time? Therefore, it is necessary to work in the same order, there is no need to be so troublesome, and the method is not unique.
The contactor coil of the main power supply goes to the normally open contact of the relay, and the contactor coil of the standby power supply goes to the normally closed contact of the relay.
When the main line has electricity, the relay is closed, the normally open contact is closed, and the main line is turned on. The normally closed contact is open and the backup power supply does not work. When the main line is de-energized, the relay is also powered off. The normally open contact resumes the initial open state and the main line is disconnected. The contactor of the standby circuit starts working through the normally closed contact of the relay.
This is similar to the above, except that this relay is a double-conversion contact. When energized, the two sets of contacts are closed. The two sets of contacts close when the power is off. An electrical component can be completed. If the A channel is a single-phase 220 volt power supply, the coil voltage of the relay is also 220 VAC.
Contactors and relays have a time lag when switching on and off, and there is a short-term reaction to equipment or appliances that require high power. For example, the bulb flashed abruptly and the motor paused. If it is a self-locking line, you will find that the powered device is not working.
This cost is a bit high and needs to be manual. If you have a strong hands-on friend, you can assemble a control circuit yourself.
Power conversion must have a short time difference, and it is impossible to achieve seamless connection in the middle.
It is mainly used in uninterruptible power supply places. It can automatically switch the load electrical equipment to another backup power supply after the failure of the normal power supply line, and keep the equipment running normally. Classification of dual power switch
(1), STS static switch is also called static transfer switch, which is the power supply two-select automatic switching system. After the first road fails, the STS automatically switches to the second road to supply power to the load (provided that the second road is normal and the first road The electric circuit is basically synchronized. If the second way is faulty, the STS automatically switches to the first way to supply power to the load (provided that the first path is normal and the second line is basically synchronized).
Suitable for UPS-UPS, UPS-generator, UPS-mains, mains-mains, etc. Any two-way power supply is continuously converted. All the above power supplies need synchronization device to ensure that the two power supplies are basically synchronized, otherwise STS cannot Switch.
It is mainly composed of intelligent control board, high-speed thyristor and circuit breaker. Its standard switching time is ≤8ms, which will not cause IT load to be cut off. It not only provides reliable power supply to the load, but also ensures the safety of the STS when switching between different phases.
(2) ATS automatic transfer switch ATS is mainly used in emergency power supply system to automatically switch the load circuit from one power supply to another (standby) power supply to ensure continuous and reliable operation of important loads. The ATS is a mechanical structure with a conversion time of more than 100 milliseconds, which can cause a load to be de-energized. Suitable for lighting and motor loads.
Dual power switching switch PC level and CB level distinction 
The dual power switch is divided into PC level and CB level, and the two structures are roughly the same. The PC stage is isolated, like a double-throw switch, plus an operating mechanism. The CB class is a circuit breaker protection type. It consists of two circuit breakers plus an operating mechanism, and has overload short circuit protection, which is the same as circuit breaker protection. Users should consider the following aspects when choosing.
(1) Consider from the perspective of reliability. The PC level is more reliable than the CB level. The PC level uses a mechanical + electronic conversion action lock, and the CB level uses an electronic conversion action lock. Therefore, in some workplaces with high safety requirements, it is recommended to choose PC-level products.
(2) Considering from the perspective of switching time. The switching time of the two products is different. PC-level products are more commonly used on geared motors because the motor speed is high (16-22r / min). After the circuit fails, the motor speed must be decelerated to a certain degree to trigger the switch action mechanism. On, the action time is relatively slow, although the switching time is slow, but as a mechanical product, it is more considered from the perspective of durability. CB-class products are commonly used in residential buildings, faulty power is disconnected easily, and switching time is fast.
(3) The PC-level dual power switch does not have a short-circuit protection function. Whether the user adds additional circuit breakers should be considered according to whether the circuit system needs it. The dual power switch is used to realize the dual power conversion function, and the short circuit protection function will not affect its operation. Many people think that the short circuit function is used to protect the switch, which is a misunderstanding of the wrong understanding.
(4) Adding an isolating switch will take up space, increase cost, and reduce reliability. It is recommended that the isolating switch in the industrial power system need to control the number of installations. It is not necessary to provide an isolating switch in the residential floor.
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