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| Intelligent Monitoring and Protection of Sonnenschein Battery |
| Time：2019-07-26 Source： Views：3103 |
Intelligent Monitoring and Protection of Batteries
According to the increasing demand of battery protection, the way of intelligent monitoring and protection of storage battery is simply explained.
Batteries are often compared to the heart of UPS power supply system. Up to 50% of UPS faults are caused by battery faults. Battery faults are an important reason for the high incidence of UPS incidents. Therefore, it is necessary to improve the safety and reliability of battery operation and fire acute. All professional users should pay attention to the protection of batteries from the angle of ensuring operation quality, production safety and property safety. Therefore, the appearance of battery protection is not a consumption expenditure, but a long-term investment in safety. At present, valve-regulated lead-acid batteries are widely used in UPS industry. The monitoring and protection of batteries are the focus of this paper.
Introduction of 1 Lead-acid Battery
Valve Regulated Lead Battery (VRLA battery) is the English name of VRLA battery. Its basic feature is that it does not need to be protected by adding acid and water during operation. The battery is a sealed structure, it does not leak acid or remove acid fog. A one-way exhaust valve (also known as safety valve) is installed on the battery cover. The function of the valve is to exceed the internal gas volume of the battery. Definite value (usually indicated by the pressure value), that is, when the pressure inside the battery rises to a certain value, the exhaust valve will actively open and discharge.
Gas, and then actively shut off the valve, to avoid air into the battery. Lead-acid batteries were born in the 1970s. By 1975, some developed countries had formed appropriate production scale, and industrialization and many of them were put into the market. Because of its low cost, good floating performance, protection-free, easy recovery and other advantages, it is very popular with users.
2 Sonnenschein Battery Safety Hidden Danger
Today, UPS uses more and more complex and diverse occupations and scenarios. There is no unified management standard for the practical use scenarios. Most of the protection personnel have not formed a scientific concept of protection or have effective protection facilities and techniques. As a result, the battery packs are often left unattended for a long time after the UPS device is completed, so that the battery packs of this kind of UPS may have great potential safety hazards. In the use scenario of UPS, the data center (central computer room) is often equipped with a lot of battery packs. This paper takes the typical representative of UPS as an example, lists three potential safety hazards of battery packs.
(1) Causing network interruption
The power supply assurance system of data center is the core system to ensure that the power supply of network equipment does not stop, and the backup battery group is the emergency power supply energy of network. Batteries can supply enough backup power to back-end equipment through inversion when the short circuit stops at the power cut or communication side, so that data can be saved and communication can be extended, and power supply of communication network will not be stopped directly. In UPS system, only the inverters and the subsequent circuits work normally, they can supply power to the back-end load. At the beginning of planning, the backup time of UPS is under consideration in the construction of computer room. However, if the battery pack is not good, there may be a machine outage in the backup power supply process, resulting in power failure of load equipment, resulting in network interruption, communication problems and direct huge economic losses. According to incomplete statistics, the data center of the financial profession may lose about $1.5 million per minute of downtime.
(2) Short circuit is harmful.
Generally speaking, when an electric short circuit is found to be on fire, the power supply should be blocked and cut off first. As far as communication power supply is concerned, because the electric energy comes from the municipal power grid or diesel generator set from top to bottom, there will always be a first-level protective device to block the short-circuit electrical circuit in time when the short-circuit fault occurs. When the battery is located at the end of the power supply system, the electricity is supplied from the bottom to the top, and there will be no other protection as long as it passes the protection circuit breaker of the battery. When short-circuit faults occur, it is often impossible to effectively block the short-circuit electrical circuit. In addition, unlike the sinusoidal wave communication, DC current has no zero-crossing instantaneous electromotive force process. Once an electrical short circuit occurs, it can not quickly cut off the arc. It is very easy to form the spread of defects, which will bring harm to the load and other equipment in the room, and even to the guards.
(3) Fire in engine room
Hydrogen is a flammable and explosive substance A. When the concentration of hydrogen in the room reaches the explosion limit (4%-75%), gas explosion will occur in the event of a fire source. Other batteries, due to various reasons such as material, device technology and thermal runaway, will inevitably cause fire if they fail to discover and block the circuit in time after the short circuit of the battery pack occurs. The more power the battery pack has, the more harmful it will be, and smoke will occur in the fire. It spreads all over the computer room agilely. Even if the computer room is equipped with a separate battery room, it may be covered by smoke because of the connection of the channels. Greater loss of personnel and property will be caused.
Necessity of Battery Monitoring System
The service life of lead-acid batteries is said to be 5-8 years. However, in the process of practical use, they are often faced with the need for replacement in 3-5 years. Although the reduction of the service life of lead-acid batteries is related to many factors of practical application, the extension of the service life of lead-acid batteries mainly depends on the daily protection and protection of batteries before there is no major breakthrough in the skills of lead-acid batteries. Maintenance, and UPS batteries throughout the lack of correct routine protection and scientific operation and maintenance. Some customers usually know that the battery is out of order when the incident happens. Not only can they not ensure sufficient backup time, but they may lose power when the load is down. And the solution to the battery problem can only be dealt with by changing batteries. This is neither economical nor environmentally friendly, and will undoubtedly reduce MTBF in data centers. And there have been several recent episodes in the computer room.
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