Fire protection system for valve side sleeve of extra-high voltage converter transformer and using method

Abstract

The invention discloses a fire protection system for a valve side sleeve of an extra-high voltage converter transformer and a using method. The system comprises an oil collecting pit, a compressed airfoam generating device, a foam dry tube, a zoning valve and a compressed air foam spray system. The fire protection system adopts the independent oil collecting pi filled with pebble beds, effectively retrains the valve side sleeve, a valve side lifting base and transformer oil flow spread after an accident occurs, reduces a fire scale to the greatest extent, reduces fire loss, and protects safety of adjacent facilities and a valve hall. The compressed air foam spraying system adopts a spray tube without a spray head and a branch tube, and clings to a fireproof wall, so that damages, on a foam release device, of valve side sleeve explosion impact are reduced to the greatest extent, and safety reliability of the system is improved, and therefore, the technical problem of fire control of the valve side sleeve of the extra-high voltage converter transformer is completely solved, the fire protection system can be used for the extra-high voltage converter transformer, and also can be usedfor 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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