A fire protection system for bushings on the valve side of an UHV converter transformer and its application method

Abstract

The invention discloses a fire protection system and an application method for a valve-side bushing of an ultra-high voltage converter transformer. The system includes an oil sump, a compressed air foam generating device, a foam main pipe, a partition valve, and a compressed air foam spray system. The use of an independent oil sump filled with pebbles effectively limits the flow and spread of the valve side bushing, valve side raised seat and transformer oil after an accident, minimizes the scale of the fire, reduces fire losses, and protects adjacent facilities and valves. hall security. The compressed air foam spray system adopts spray pipes without nozzles and branches, and is arranged close to the firewall, which minimizes the damage to the foam release device caused by the explosion impact of the casing on the valve side, and improves the safety and reliability of the system. Thus, the technical problem of fire prevention and control of the bushing on the valve side of the UHV converter transformer is completely solved, and it can be used not only for the UHV converter transformer, but also for other converter transformers.

Description

technical field [0001] The invention relates to a power transformer fire extinguishing technology, in particular to a fire protection system and a use method for a valve side bushing of an UHV converter transformer. Background technique [0002] In recent years, with the rapid development of UHV DC transmission technology, my country has taken the lead in building more than a dozen UHV DC transmission projects, with hundreds of UHV converter transformers. The UHV converter transformer is the core equipment of the UHV DC transmission project, and its safe and stable operation is the basis for the normal operation of the UHV DC transmission project. However, due to the high voltage level, large energy, large oil storage capacity, compact layout, and high operating temperature of UHV converter transformers, the risk of fire is high and the damage is great. Once a fire occurs, it will cause major economic and property losses and seriously affect the power grid. of stable operat...

AI Technical Summary

Problems solved by technology

Once the bushing on the valve side breaks or explodes and catches fire, not only the transformer oil in the bushing on the valve side will leak into the valve hall to form a flowing fire, but also the oil in the converter transformer oil tank and high-level oil pillow will flow continuously under the action of gravity Input to the casing on the valve side, and further form a dynamic overflow fire and a large area of ​​flowing fire, thus threatening the safety of the entire valve hall

[0005] (2) Fires in UHV converter transformer oil tank and grid side bushings will also affect the valve hall, resulting in damage to the valve hall

[0006] The spray nozzles and fire branch pipes of automatic fire extinguishing systems such as water spray fire extinguishing systems and foam spray fire extinguishing systems are greatly affected by transformer explosions, fires, and high temperatures. Parts that are easily blown away and explosion shock waves will be damaged, resulting in failure of the overall system Therefore, it is not suitable for use in converter transformer bushings with explosion hazards

Existing water spray fire extinguishing systems, foam spray fire extinguishing systems and other automatic fire extinguishing systems have limited fire extinguishing and anti-resurgence capabilities for large-area flowing transformer oil fires. Conventional measures such as emergency oil discharge and building fire dikes are not suitable for the limited space in the valve hall. If it is used inside, it is easy to cause a large area of ​​flowing fire to spread, and damage a large number of valuable instruments and equipment in the valve hall.

[0007] It can be seen that the existing UHV converter transformer fire protection measures cannot meet the fire protection requirements of valve side bushings and valve halls, and there are great fire safety hazards. Effective fire safety protection measures are urgently needed

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