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UPS power supply solutions for the power industry. The working principle and output characteristics of the power UPS power supply are exactly the same as those of the traditional UPS. The power UPS system generally consists of three parts: the power UPS host, the bypass voltage stabilizing cabinet, and the output feeder cabinet. The power dispatch center requires the AC uninterruptible power supply (UPS) system to provide power to the system equipment and some backup lighting equipment in the dispatch center and information center. Let’s take a look at a UPS power solution.
Development background of UPS in the power industry:
The power plant is a special production enterprise with a high degree of automation. The automated production equipment depends on the safe and stable operation of the power supply system. In modern power plants, the DCS control system of the generator set includes various thermal automatic devices, such as automatic adjustment assembly instruments, turbine electro-hydraulic digital adjustment devices, boiler interlocking and safety monitoring systems FSSS, turbine monitoring instruments, coordination The control system, lubricating oil pump system, hydrogen sealed oil and electricity system, main thermal power, and emergency lighting power supply system all need a reliable power supply.
Since most of the loads in the decentralized control system of power plants are single-phase loads, single-phase load distribution lines are simple and easy to maintain. Therefore, most UPS power supplies dedicated to power plants are required to be small and medium-sized power UPS with three-phase input/single-phase input and single-phase output, and the capacity is generally within the range of 60kVA.
The electric UPS uninterruptible power supply and the electric DC operating power supply system form a special uninterruptible power supply for power plants and substations, supplying power to microcomputers, communications, carriers, emergency lighting and other equipment that cannot be powered off.
UPS power supply solutions in the power industry:
The power dispatch center requires the AC UPS uninterruptible power supply system to provide power to the system equipment and some backup lighting equipment in the dispatch center and information center. Taking into account the characteristics of the power supply load, power load capacity and reliability, it is necessary to use UPS parallel redundancy to ensure power supply to various process equipment in the building.
The two lines of mains power I and mains II provided by the building's distribution transformer are first switched through the incoming power supply screen and output two AC power supplies. The AC power is input to the UPS through the isolation transformer and the UPS power incoming line screen. The use of input isolation transformers can, on the one hand, improve the power quality of the input UPS power supply and reduce harmonics. On the other hand, when surges, induced overvoltage and other conditions occur, it can play a certain role in the UPS power supply and subsequent electrical equipment. Protective effects.
Through communication with customers, we provide solutions that meet customer requirements. Two UPSs with 300KVA 12-pulse isolation transformers operate in parallel and are powered by two mains lines. If one mains line loses power, the linkage switch in the power incoming panel automatically closes, and the two UPSs are powered by one mains line.
In order to facilitate future inspection and maintenance, a large bypass is set up, which can bypass the entire UPS system and use Mains II as the bypass power supply. The UPS power supply equipment screen is arranged in the UPS power supply room on the 21st floor of the building. Three-phase four-wire copper busbars are used to connect the power supply panels within and between panels, minimizing unnecessary switches. The screen cabinet and in-screen equipment have reliable performance and high stability.
The UPS power supply uses a shared battery pack, that is, when one UPS power supply fails or is overhauled, its battery can be switched to another UPS power supply to extend the discharge time. In order to avoid damage to the battery life, it is recommended When a UPS power supply is undergoing maintenance and two sets of batteries need to be shared, try to switch the battery pack on and off in a short time. The battery switch cabinet is placed in the battery room.
The power distribution system includes 2 UPS output main distribution panels arranged in the UPS power supply room and distribution panels arranged in each machine room in the power dispatch center on the 19th to 24th floors of the building. From the UPS output main distribution panel to the distribution panels in each professional computer room, redundant double-circuit lines are used for power supply. Circuit breakers are installed at both ends of each line. Failure or maintenance of one circuit will not affect the other circuits. The power supply of the primary circuit does not affect the normal operation of the secondary equipment.
What are the characteristics of UPS dedicated to the power industry?
1. The professional UPS customized for the electric power industry adapts to the harsh power grid environment within the electric power industry, meets the load requirements of the electric power industry, and allows users to no longer have to worry about the three-phase unbalance of the load.
2. The 1+1 redundant parallel working mode allows the power supply system to add a safety lock to meet the extreme needs of power industry users for UPS high reliability indicators.
3. Make full use of the 220V/110V large-capacity battery pack in the power industry to maximize the backup time of the UPS power supply and save the installation space and initial investment of the battery pack.
4. Optional bypass isolation transformer can achieve complete isolation between input and output, and ensure that the output zero-ground voltage is <1V.
5. Rich dry contact monitoring signals can be incorporated into the power plant's own DCS monitoring system; problems can be reported in a timely manner to facilitate real-time monitoring of the UPS by the personnel on duty.
Because power plants require high reliability of equipment, they have very high requirements on the reliability and service life of UPS power supplies. Overall, the UPS uninterruptible power supply system has been recognized by the market as a power supply model that can provide the power system with more stable pressure and purer frequency. Its application and promotion will gradually become an inevitable trend in the development of my country's power system, and industry competition will also Will be white-hot.
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