Fourth, the advantages of dual power supply(A) stable and reliable
Dual power supply mainly breaks the traditional output DC voltage mode, and directly adopts a bidirectional channel.Through internal integration, the AC power supply can be directly turned into DC power supply, thus improving the utilization rate of the transformer. According to relevant data, the utilization rate of the transformer can be increased by about [X]% after adopting dual power supply.This method makes the power system more stable and reliable, and can play an important role in various occasions.For example, in some places with very high requirements for power supply, such as operating rooms in hospitals, computer data centers, etc., dual power supply can ensure that when the main power supply fails, the backup power supply can quickly take over to ensure the normal operation of the equipment, which provides a strong guarantee for the safety of patient’s life and data security.
(ii) Protection circuit
Compared with the ordinary output power supply, the dual power supply has a higher degree of accuracy. It can directly and independently complete the energization, providing effective protection for the circuit to a certain extent and making the circuit more stable.With the continuous development of technology, the overall performance of dual power supply is continuously enhanced. At present, the accuracy of dual power supply can already reach [specific data], which can better meet the needs of various complex circuits.For example, in the power supply system of some precision instruments, dual power supply can ensure the stable output of the current, to avoid damage to the instrument due to current fluctuations.At the same time, dual power supply can also play a protective role for the electronic devices in the circuit, when the circuit over-voltage, under-voltage and other abnormalities, dual power supply can cut off the power supply in a timely manner, to prevent the electronic devices due to over-voltage and burned or under-voltage can not work properly.This protection function not only extends the service life of electronic devices, but also improves the reliability and stability of the entire circuit system.V. Application Scenarios of Dual Power Supply
(A) important places
Hospitals as an important place for people’s lives and health, the stability and reliability of the power supply requirements are extremely high. Once the power failure, may endanger the lives of patients. For example, in the process of surgery, if there is a sudden power outage, the backup power supply can be quickly started to ensure the normal operation of surgical equipment for the safety of the patient’s life.According to statistics, a large portion of the medical errors caused by power outages each year can be avoided by dual power supply.Shopping malls are also places with a large flow of people, especially during holidays and other peak periods, the normal operation of lighting, elevators, air conditioning and other equipment is crucial. Dual power supply can ensure that when the main power supply fails in shopping malls, the backup power supply can be put into use in time to avoid the chaos and economic losses caused by power outages. As a transportation hub, the airport’s demand for electricity cannot be interrupted even for a moment. From the flight information display system to the navigation equipment, all need a stable power supply.Dual power supply can ensure that the airport can operate normally under any circumstances, and guarantee the safety and smoothness of travelers.(ii) Industrial equipment
In industrial assembly lines, the role of dual power supply is particularly obvious.Once the power is interrupted, it may cause the production line to come to a standstill, resulting in huge economic losses.For example, in an automobile manufacturing plant, welding robots, spraying equipment, etc. require a stable power supply. Dual power supply can ensure that when these equipments have a failure of the main power supply, the backup power supply can start quickly to ensure the continuous operation of the production line. In the metallurgical industry, high-temperature furnaces and other equipment require high power stability. Dual power supply can switch to the backup power supply in time when the main power supply has a problem, avoiding the cooling of the furnace due to power failure, which will affect the production progress and product quality. In the chemical industry, many chemical reactions need to be carried out at specific temperatures and pressures, which may cause dangerous accidents in case of power failure.Dual power supply can provide chemical enterprises with reliable power protection to ensure the safety and stability of the production process.(C) Communication Center Room
As the core hub of information transmission, the communication center room has extremely strict requirements for power supply. As one of the three power sources, dual power supply plays a vital role in the communication center room. It can guarantee the continuous and reliable operation of important loads and ensure the normal work of communication equipment. In the communication center room, a large amount of data transmission and processing requires a stable power supply. If there is a power outage, it may lead to communication interruption, affecting people’s daily life and the normal operation of social economy. Dual power supply can quickly switch to the backup power supply when the main power supply fails to ensure the uninterrupted operation of communication equipment. At the same time, dual power supply can also be used in conjunction with other backup power (such as diesel generators, UPS, etc.) to further improve the reliability of the power supply of the communication center room.
Six, dual power switching considerations
(A) three-phase phase sequence is the same
In the dual power switching, be sure to ensure that the three-phase phase sequence of the two power sources are the same. If the phase sequence is different, the three-phase loads of the motor type will be reversed, which may cause serious damage. The state regulations of the special or first-class load users, such as high-rise buildings, post and telecommunications, coal mines, ships, industrial assembly lines, medical and health care, military equipment, airports, firefighting, metallurgy, chemical industry, textiles, petroleum, and other important places where power outages are not permitted, once the problem of the phase sequence of the equipment caused by the reversal, the consequences are unimaginable. For example, in the important medical equipment in hospitals, if the phase sequence is different caused by equipment reversal, may affect the patient’s treatment or even life-threatening. Dual power supply system to identify the phase sequence of the two power sources is the same work is called phase verification. Commonly used to measure the voltage between the phase of the method of nuclear phase, such as 380V first road for Ua1, Ub1, Uc1; the second road for Ua2, Ub2, Uc2. Measurement of the two two voltages are as follows, then the phase sequence is consistent: Ua1 Ub1 Uc1Ua2 0 380 380Ub2 380 0 380Uc2 380 380 0. 380v bulb can also be used to connect the two three-phase power supply, the two non-light-emitting lines are the same, the two lines are the same. Not luminous two lines for the same phase power, otherwise it is wrong, this is a simple and practical way to determine. This is a simple and practical way to judge. Of course, it is the busbar power supply at the same time with an AC voltmeter to measure the voltage of the same phase is very small, and the voltage of the different phases of 380V or so. First connected to a power supply, with phase sequence and phase protector test, so that it works (phase sequence is correct); and then just tested the power supply is disconnected, sent on another power supply, with the same method, so that it works (phase sequence is correct), it is OK.
(ii) Concerned about the conversion time requirements of power-using equipment
Dual power automatic diverter switch in the switching standby power is a delay, and some of the power equipment on the dual power automatic diverter switch conversion time is a strict requirement. Therefore, when selecting a dual-supply automatic diverter switch, it is important to optimize whether the switching time of the power-using equipment meets the requirements. For example, in some key industrial control equipment, medical equipment and other places that require high power continuity, the switching time of the dual power changeover switch is usually between 0.1 and 0.5 seconds, which is more suitable for fast switching. In some commercial buildings, such as power systems, power switching time has certain requirements, but is not extremely sensitive to the scene, the switching time is generally 1 second to 5 seconds of medium-speed switching to meet the needs. For some common industrial production equipment or non-critical civil facilities and other relatively low switching time requirements of the occasion, the switching time may be more than 5 seconds of slow switching type can be used.
(iii) Installation of the location of the ups
If you also install ups (uninterruptible power supply) to the important equipment power supply needs to be installed behind the dual power switch to ensure uninterrupted power supply. In general, a main line blackout, double power transfer switch can automatically enable another line for the load power supply. The most common is all the way with the utility, all the way with the generator. At present, there are two different substations used more often over the utility power. In this case, the correct location of the installation of the ups can be in the dual power switching process, to ensure that important equipment always have a stable power supply. For example, in the communications center room, at least three power supply, all the way DC UPS power supply, all the way or two utility, a diesel generator set. This configuration can ensure that the important load continuous and reliable operation.
