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3. Problems encountered in practical application of ATS and corresponding product solutions As the economy develops, modern life and modern industry are less and less tolerant of power outages. Foreign industrialized countries (especially the United States) regard ATS products as part of the power supply, and are very cautious about the selection and use of ATS products. In the dual power emergency power supply system, first choose PC-level products, and the switch is not allowed to stay in the middle of the conversion process (that is, without zero position). The purpose is to increase the reliability of the power supply, especially for UPS. Due to the different types of backup power and application environments, the ATS selection should also be different. 3.1 Problem 1: Switch synchronization problem Ordinary ATS is not allowed to transfer with large motor or high inductance load. If the large motor load is switched during operation, it will be subject to huge mechanical stress when the power supply phase gap is large. At the same time, the overcurrent caused by the back EMF generated by the motor may cause the fuse to blow or the circuit breaker to trip. Solution: If you choose an ATS with phase angle synchronous detection and switching function, check whether the two power supplies are synchronized before switching if the two power supplies exist at the same time. When the synchronization detection is qualified, the ATS is allowed to switch. At this time, ensure that the back EMF and the about-to-input The mains potentials used are synchronized so that no inrush currents can blow fuses or trip circuit breakers. 3.2 Question 2: Neutral line switching problem when matching with UPS Ordinary three-phase ATS has three-pole and four-pole classification, but the three-pole switch cannot meet the requirements of my country's power supply system that the incoming ATS must be four-pole switching and four-pole isolation. Although the four-pole ATS can meet the above requirements, it does not take into account the adverse effect of the four-pole simultaneous switching ATS on the user's load, especially the single-phase load in actual use. Since the ATS needs to be switched with load, the UPS will automatically switch to the bypass and cause the load to lose power due to the absence of the neutral line at the moment of switching in actual use. Raised and burned. If you choose an ATS with the function of zero line overlap switching (later clutch first make technology), when the phase line ends are arced during the switching process, this structure can ensure that the zero line will not be separated temporarily; and when the switching is about to end, the phase line At the same time as the arc is drawn at the end, the structure can ensure that the zero line has been reliably contacted. During the whole switching process, the phenomenon that the neutral line is vacated will not occur. 3.3 Problem 3: Maintenance and Repair Problems Once the ordinary ATS is p...

With the development of society, people's life today is more and more inseparable from electricity, especially now the requirements for high reliability and safety of power supply are also higher and higher. In order to ensure people's life and ensure that people's lives and property are not affected and infringed by power grid outage, internal combustion engine generator set, as standby and emergency power supply, is more and more widely used in different fields, However, the generator set is only a power supply that generates electric energy. It can not directly switch between safe, fast and reliable power supply and power supply with the power grid ATS is a dual power switching device, which itself does not have the ability to start the generator. Generally, the principle of ATS is two-way input (one main and one standby). When the main power supply loses power and the standby power supply has power, it will automatically switch to the standby power supply. If you want to realize the function you want, you need to add a PLC to connect the voltage input signal of the mains power to the PLC. When there is no voltage, the PLC starts the generator, and ATS should be able to delay switching. Of course, if your ATS is programmable with input and output, you can use ATS programming directly.

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Power Factor Normally 0.8 to 0.95 will do. The impact of too high or too low can be compared to the water carried by a bucket. Water is like active power generator, and the bucket is like reactive power. Only a bucket can lift water. But if the power factor is too high, it’s like filling the bucket very full. It doesn’t matter when it’s stable. Once a bit of disturbance, it’s easy to spill the water. Too low is like filling the bucket with less water, which is safe, but the bucket also has weight and consumes power. The efficiency is low ; if you install an 8-point or 9-point full, you are not afraid of disturbance, and the efficiency is higher. The size of the diesel genset power factor is related to the nature of the load of the circuit. For example, the power factor of resistive loads such as incandescent bulbs and resistance furnaces is 1. Generally, the power factor of circuits with inductive loads is less than 1. Power factor is a coefficient that measures the efficiency of electrical generator equipment. The low power factor indicates that the reactive power used by the circuit for alternating magnetic field conversion is large, which reduces the utilization rate of the equipment and increases the power supply loss of the line. Each motor system consumes two large powers, which are real active power (unit: watts) and reactive reactive power (unit: watts). Power factor is the ratio between useful work and total power. The higher the power factor, the greater the ratio between useful work and total power, and the more efficient system operation.