CN106267627B

CN106267627B - Transformer explosion fire extinguishing system

Info

Publication number: CN106267627B
Application number: CN201610914915.2A
Authority: CN
Inventors: 梁戈
Original assignee: Mingsen Intelligent Fire Fighting Equipment Jiangsu Co ltd; China Energy Construction Group Yunnan Electric Power Design Institute Co ltd
Current assignee: Mingsen Intelligent Fire Fighting Equipment Jiangsu Co ltd; China Energy Construction Group Yunnan Electric Power Design Institute Co ltd
Priority date: 2016-10-20
Filing date: 2016-10-20
Publication date: 2022-01-25
Anticipated expiration: 2036-10-20
Also published as: CN106267627A

Abstract

The invention discloses a transformer explosion fire extinguishing system which comprises a fire position alarm positioning device, an external environment monitoring device, a dry powder extinguishing pipe network capable of controlling the spraying range, dry powder extinguishing equipment, an oil discharge-cut-nitrogen injection pipeline, simplified nitrogen injection extinguishing equipment, a dry powder-nitrogen injection combined system fire alarm linkage controller with various control modules and other parts, and solves the problems that the conventional transformer extinguishing system cannot extinguish spread fire, sustain fire and re-fire caused by serious explosion of a transformer, and the conventional extinguishing system wastes national investment.

Description

Transformer explosion fire extinguishing system

Technical Field

The invention relates to the technical field of fire-fighting equipment, in particular to a fire extinguishing system of an oil-immersed power transformer.

Background

In recent years, as power equipment put into production during the peak period of the previous round of power construction in China successively enters the upgrading and updating period, transformer accidents caused by equipment aging and loss tend to increase. 10 days 7 months 2015, 500kV city of Yunnan province is changed into a single-phase main transformer high-voltage bushing to cause serious explosion fire, through accident site analysis, a transformer fire extinguishing system pipe network is damaged by the exploded bushing and cannot be used, a transformer bushing maintenance flange is exploded for 50m away, transformer oil passes through a fire wall and is sprayed onto an adjacent single-phase transformer body, the oil sprayed onto the adjacent transformer is less due to the special position of the exploded transformer high-voltage bushing, otherwise the adjacent transformer is likely to spread the fire; in 2016, 6 months and 18 days, 3 transformers of 330KV transformer substations in southeast Asia of Western Ann cause continuous fire disasters. The fire is caused by the fire of a cable duct, after the fire initially spreads to a nearest main transformer, the fire continuously spreads to adjacent main transformers and distribution equipment sites due to the failure of active fire-fighting measures, and the rest two main transformers are slightly exploded and ignited in sequence, so that the short-time and large-area power failure of the Western-style security city is caused by an accident.

After the fire case analysis, the fire extinguishing device for spraying water, spraying dry powder, discharging oil and injecting nitrogen used by the large-scale oil-immersed power transformer in China at present can only extinguish the slight explosion fire of the transformer and can not extinguish the moderate and serious explosion fire of the transformer. The main existing problems of the existing fire extinguishing system are as follows: 1) the transformer explosion fire generally forms the external spreading fire, the continuous reburning fire and the internal continuous reburning fire of the transformer, and the existing transformer fire extinguishing system is only provided with one fire extinguishing system such as water spray, dry powder or oil discharge and nitrogen injection and the like, so that the transformer explosion fire and the internal and external fire cannot be simultaneously extinguished; 2) the splashing and flowing range of the transformer oil exceeds the protection range of a transformer fire extinguishing system, and the spreading and continuous reburning fire exceeding the range of the fire extinguishing system cannot be rescued; 3) the existing transformer fire extinguishing system alarm device cannot accurately position fire positions, all spray heads blindly spray fire at one time, fire extinguishing agents are sprayed to the fire positions too much, and fire extinguishing spray protection of key fire extinguishing positions is insufficient; 4) the alarm device gives an alarm once, the extinguishing agent is sprayed once, the reignition fire cannot be put out, and the fire extinguishment fails; 5) a pipe network explosion-proof device is not arranged, and the fire extinguishing pipe network is damaged and fails by the explosion part of the transformer; 6) external environmental factors such as wind speed and rainfall are not considered, and the fire extinguishing effect is seriously influenced; 7) the existing dry powder fire extinguishing system has the problem that dry powder dust can cause pollution flashover of electrical equipment; the nitrogen injection fire extinguishing device has numerous problems of misoperation and refusal to operate; the existing other transformer fire extinguishing systems have the problems that the existing transformer fire extinguishing systems cannot be used or are difficult to use under the drought, water shortage, high and cold freezing environment conditions.

Therefore, under the condition that the fire accidents of the transformer caused by the aging and the loss of the power equipment are obviously increased, the development of an effective fire extinguishing system for the explosion of the transformer is an urgent and important matter.

Disclosure of Invention

The purpose of the invention is: in order to solve the main problems of the existing fire extinguishing system when the transformer is exploded and conflagrated, the fire extinguishing system solves the structural composition problems of the fire extinguishing system of the transformer fire extinguishing system when the transformer is exploded and conflagrated, the fire spreading, the fire sustaining and the fire reburning; the problem of alarm positioning of the explosion fire part of the transformer is solved; the problem of influence of external environmental factors is solved; the problem of spray control of fire extinguishing pipe network spray heads corresponding to different fire ranges is solved; the common problems of a dry powder system and a nitrogen injection system are solved; solving the fire extinguishing control problem of different fire parts.

The technical scheme of the invention is as follows:

the method comprises the following steps of analyzing the problems of the existing fire protection system and the influence of transformer explosion fire, forming a transformer explosion fire extinguishing system structure, forming a fire position alarm positioning device, forming an external environment monitoring device, forming fire extinguishing pipe network control devices in different fire ranges, forming different fire positions: fire extinguishing control method for fire extinguishing key positions, common top and side sleeve fire positions, improving inherent problems of a dry powder system and a nitrogen injection system, passing an explosion fire extinguishing test, checking and improving the fire extinguishing system to meet the fire extinguishing requirement of the explosion fire

The utility model provides a transformer explosion fire extinguishing system, its characterized in that, this system by fire position warning positioner, external environment monitoring devices, steerable injection range dry powder fire extinguishing pipe network, dry powder fire extinguishing apparatus, oil extraction-cutout-notes nitrogen pipeline, simplified type notes nitrogen fire extinguishing apparatus and have the dry powder of multiple control module-annotate parts such as nitrogen combined system fire alarm linkage controller and constitute, wherein:

the fire position alarming and positioning device consists of a non-contact fire detector 1, a non-contact fire temperature positioning detector 2 and a transformer image monitoring probe 3, and is connected with a fire alarming linkage controller;

the external environment monitoring device consists of a wind speed/rainfall monitor, a transformer power-off signal and a transformer image monitoring probe, and is connected with the fire alarm linkage controller;

the dry powder fire extinguishing pipe network consists of a fire extinguishing main pipe, a partition selection valve, a fire extinguishing distribution pipe, an electric injection control valve, a fixed or movable fire extinguishing branch pipe, a manual injection control valve and a weather-proof porous cluster nozzle, wherein the fire extinguishing main pipe is connected with an outlet of dry powder equipment;

the dry powder fire extinguishing equipment consists of an equipment room, a boiling powder storage tank, a dry powder driving gas bottle group and a starting bottle group, wherein the boiling powder storage tank, the dry powder driving gas bottle group and the starting bottle group are arranged in the equipment room;

the oil discharge-cut-off-nitrogen injection pipeline is respectively composed of an oil discharge pipe, an oil discharge valve, an oil discharge pipe mechanical maintenance valve, a cut-off valve, a nitrogen injection fire extinguishing pipeline, a nitrogen injection valve, a nitrogen injection-oil discharge interlocking valve and a nitrogen injection pipe mechanical maintenance valve;

the nitrogen injection fire extinguishing equipment consists of a nitrogen injection cabinet, a nitrogen bottle group and a nitrogen releasing device, the nitrogen releasing device is connected with a nitrogen injection fire extinguishing pipeline,

the fire alarm linkage controller of the dry powder-nitrogen injection combined system consists of a fire alarm controller and a fire linkage controller, and is connected with a fire part alarm positioning and external environment monitoring device, dry powder fire extinguishing equipment, a dry powder pipe network injection control valve, a nitrogen injection fire extinguishing device, a nitrogen injection and oil discharge valve and the like;

the invention is different from the prior dry powder fire extinguishing system in that: the fire extinguishing system consists of dry powder and a nitrogen injection fire extinguishing system, and can simultaneously extinguish external spread fire, sustained fire, reburning fire and internal sustained fire and reburning fire formed by transformer explosion fire; the fire alarm system is provided with a non-contact fire detector, a non-contact infrared temperature measurement positioning device and a manual or imaging device, wherein the non-contact fire detector, the non-contact infrared temperature measurement positioning device and the manual or imaging device can be used for alarming and positioning fire positions, accurately positioning the fire positions, providing basis for starting a fire extinguishing system and linking the fire extinguishing system to perform fixed-point fire extinguishing protection, and solving the problems of alarm misoperation and starting of an unmanned on-duty station fire extinguishing system; setting an environment monitoring device for wind speed and rainfall to ensure that the fire extinguishing system starts to extinguish fire at the time of the best fire extinguishing effect; the dry powder fire extinguishing system is improved, the fire extinguishing mode that fire extinguishing agents are wasted due to insufficient protection of key parts and insufficient fire extinguishing agent spraying regardless of the fire position and the fire range is completed, the fire is positioned through the fire position alarm positioning device, then the fire extinguishing pipe network spray control valve is linked, and all or part of the fire extinguishing spray heads are opened to perform repeated multiple spraying fire extinguishing on the fire position; meanwhile, according to the fire characteristics of different fire parts, fire extinguishing control modules such as a starting condition control module, a short-time multi-time injection module, a fire extinguishing key part, a general top sleeve fire part, a general side sleeve fire part and the like are arranged to perform key multi-time repeated injection fire extinguishing, so that a fire extinguishing agent is saved, and a spread fire, a sustained fire and a reburning fire are put out;

the invention is different from the prior nitrogen injection fire extinguishing device in that: the nitrogen injection cabinet and the dry powder fire extinguishing equipment room are arranged at safe positions outside the influence range of the transformer explosion fire, so that the danger of temperature rise and explosion of the nitrogen cylinder group in high temperature of a fire scene is avoided; the alarm device, the electric linkage locking device, the mechanical linkage locking device and the fire extinguishing linkage device of the nitrogen injection fire extinguishing equipment are simplified, and a fire alarm linkage control device is shared with a dry powder system, so that the false alarm and the false operation of the fire extinguishing system are reduced; a nitrogen injection-oil discharge interlocking valve is additionally arranged in front of a nitrogen injection valve of the nitrogen injection fire-extinguishing pipeline, and the nitrogen injection pipe is used for mechanically overhauling the valve, the nitrogen injection-oil discharge interlocking valve is used for preventing the nitrogen injection valve from being mistakenly operated, and the nitrogen injection pipe is used for electrified overhauling; the oil discharge pipe and the nitrogen injection cabinet are separately arranged, a mechanical maintenance valve of the oil discharge pipe is added behind an oil discharge valve of the oil discharge pipe, valve maintenance is increased, the failure of the valve is reduced, the nitrogen injection valve, the oil discharge valve, the cut-off valve and the nitrogen injection-oil discharge interlocking valve are all connected to a fire alarm linkage controller,

the fire alarm linkage controller is different from the fire alarm linkage controller of the existing fire extinguishing system, the system is connected with a fire part alarm device, an external environment monitoring device, dry powder fire extinguishing equipment, an injection control valve, a nitrogen injection fire extinguishing device, a nitrogen injection oil discharge valve and the like, the injection control valve and a fire alarm positioning infrared thermometer at a sleeve are set to be in linkage relation, a starting condition control module, a short-time multi-time injection module, a fire extinguishing key part priority module, a general top fire extinguishing control module and a general side fire extinguishing control module are preset, a fire extinguishing pipe network and a spray head are accurately controlled to perform key multi-time repeated injection fire extinguishing on the fire part by accurately positioning the fire part, fire extinguishing agents are saved, and spreading fire, sustained fire and reburning fire are extinguished;

1. explosion fire characteristics and fire parts of transformer

The flash point of the transformer oil is 140 ℃, the ignition point is about 165-180 ℃, and the self-ignition point is about 332 ℃. Generally, as the insulation materials such as cable paper, cotton yarn, cloth, wood block and the like in the transformer gradually age, the insulation strength is reduced, when the conditions that the transformer has a penetrating fault, overvoltage impact and poor overhauling quality to cause local insulation damage, the transformer oil is degraded or the transformer is wetted when water enters the transformer are met, can cause insulation breakdown of the transformer to cause short circuit and generate high-temperature electric arc, the transformer oil is rapidly decomposed and gasified under the high-temperature action of the electric arc, so that the internal pressure of the transformer is rapidly increased, when the pressure is too high to the weak flange-connected pressure-bearing parts of a transformer bushing, a bushing lifting seat, a pressure regulating switch and the like on the shell of an accident point and cannot bear the pressure, a large amount of high-temperature transformer oil exceeding the self-ignition point is sprayed out of the transformer and is violently combusted after encountering air, so that transformer explosion fire, spreading fire, continuous fire and reburning fire are formed. The invention divides the severity of the transformer explosion fire into three categories according to the damage degree of the weak pressure-bearing part of the transformer, the splashing amount of the transformer oil, the oil temperature of the transformer, the splashing range size, the difficulty degree of the rescue and the like: a light explosion fire, a medium explosion fire, and a severe explosion fire.

The fire part: the transformer fire only occurs at the pressure-bearing weak parts such as the joints of the transformer bushing and the voltage regulating switch flange, and simultaneously, only one position of the transformer fire breaks out or explodes. The invention divides the fire location into fire extinguishing key location, general top fire location and general side fire location. The fire extinguishing key position refers to a fire position which can cause direct losses such as adjacent transformers, electrical equipment and cable spread fire positions and continuous fire burning collapse of steel beams of a transformer outgoing line framework, and indirect losses such as total station voltage loss of a transformer substation, power failure of important users, fire environmental pollution, social influence and the like; the general top fire part and the general side fire part refer to the fire accident point on the top or the side, but direct losses such as continuous fire burning collapse of adjacent transformers, electrical equipment and cables and steel beams of a transformer outgoing line framework cannot be caused, and the fire part which has only small indirect losses such as fire environmental pollution, social influence and the like can be extinguished by a fire brigade after the fire.

2. Transformer explosion fire extinguishing system composition structure

The utility model provides a transformer explosion fire extinguishing system, this system by fire position warning positioner, external environment monitoring devices, steerable injection range dry powder fire extinguishing pipe network, dry powder fire extinguishing apparatus, oil extraction-cutout-notes nitrogen pipeline, simplified type notes nitrogen fire extinguishing apparatus and steerable system carry out the dry powder of fixed point short-time multiple fire extinguishing-annotate parts such as dry powder-notes nitrogen combined system fire alarm linkage controller and constitute, wherein:

the external environment monitoring device consists of a wind speed/rainfall monitor 4, a transformer power-off signal 5 and a transformer image monitoring probe 3, and is connected with the fire alarm linkage controller;

the dry powder fire extinguishing pipe network consists of a fire extinguishing main pipe 6, a partition selection valve 7, a fire extinguishing distribution pipe 8, an electric injection control valve 9, a fixed or movable fire extinguishing branch pipe 10, a manual injection control valve 11 and a weather-proof porous cluster nozzle 12, wherein the fire extinguishing main pipe 6 is connected with the outlet of the dry powder equipment;

the dry powder fire extinguishing equipment comprises an equipment room 13, a 3D boiling powder storage tank 14, a dry powder driving gas cylinder group 15 and a starting cylinder group 16, wherein the 3D boiling powder storage tank 14, the dry powder driving gas cylinder group 15 and the starting cylinder group 16 are arranged in the equipment room 13;

the oil discharge-cut-off-nitrogen injection pipeline is respectively composed of an oil discharge pipe 17, an oil discharge valve 18, an oil discharge pipe mechanical maintenance valve 19, a cut-off valve 20, a nitrogen injection fire extinguishing pipeline 21, a nitrogen injection valve 22, a nitrogen injection-oil discharge interlocking valve 23 and a nitrogen injection pipe mechanical maintenance valve 24, one end of the oil discharge pipe is connected with the upper part of a protected body 25, the other end of the oil discharge pipe is connected with an oil discharge system, the oil discharge pipe is provided with the oil discharge pipe mechanical maintenance valve 19 and the oil discharge valve 18, one end of the nitrogen injection pipe is connected with the nitrogen injection fire extinguishing equipment, the other end of the nitrogen injection pipe is connected with a nitrogen injection port at the bottom of the protected body 25, the cut-off valve 20 is arranged on a communicating pipe between a top oil pillow 26 and the protected body, and the nitrogen injection fire extinguishing pipeline 21 is respectively provided with the nitrogen injection pipe mechanical maintenance valve 24, the nitrogen injection-oil discharge interlocking valve 23 and the nitrogen injection valve 22;

the nitrogen injection fire extinguishing equipment consists of a nitrogen injection cabinet 27, a nitrogen cylinder group 28 and a nitrogen releasing device 29, the nitrogen releasing device is connected with the nitrogen injection fire extinguishing pipeline 21,

the fire alarm linkage controller of the dry powder-nitrogen injection combined system consists of a fire alarm controller 30 and a fire linkage controller 31, and is connected with a fire part alarm positioning and external environment monitoring device, dry powder fire extinguishing equipment, a dry powder pipe network injection control valve, a nitrogen injection fire extinguishing device, a nitrogen injection and oil discharge valve and the like;

3. fire position alarming and positioning device

The transformer fire alarm is different from the existing transformer fire alarm which adopts a cable type constant temperature detector or other detectors, can only alarm the fire once, cannot alarm the reburning fire and position the fire part, leads all spray heads of the fire extinguishing system to blindly spray the fire at one time, sprays too much fire extinguishing agent to the non-fire part, does not sufficiently spray the fire extinguishing agent to the fire extinguishing key part, wastes the fire extinguishing agent, cannot extinguish the reburning fire and sustain the fire; after the existing unattended station fire alarm, the alarm misoperation caused by the failure of confirmation in an automatic operation mode is caused, and the problem of unmanned starting is also faced in a manual starting mode; the invention is provided with a fire position alarming and positioning device which consists of a non-contact fire detector, a non-contact fire temperature positioning detector and a transformer image monitoring probe, wherein the non-contact fire detector generally consists of a point type fire infrared detector or other fire detectors with similar functions and is arranged at two opposite angles outside a transformer; the non-contact fire temperature positioning detector is generally an infrared point temperature instrument or other infrared temperature measuring devices and is arranged on a transformer fire extinguishing system pipe network, and a non-contact infrared point temperature instrument is correspondingly arranged at the high-voltage and medium-voltage three-phase sleeve pipe, a neutral point sleeve pipe, a voltage regulating switch flange and a low-voltage side three-phase sleeve pipe base flange of each transformer; the transformer image monitoring probe is arranged on the top of the transformer and outside the influence range of explosion and fire of the transformer and can observe the positions of all sleeves of the transformer by adopting independent arrangement or sharing the transformer image monitoring probe of the transformer; the non-contact fire detector 1 and the non-contact fire positioning detector 2 are connected with a fire alarm controller 29 through signals, the transformer image monitoring image signals are connected with a fire linkage controller, and a display displays fire alarm, temperature values of infrared thermometers of all sleeves of the transformer and fire overlooking panoramic images of the transformer image monitoring image probes.

The method comprises the following specific implementation steps: after an explosion fire occurs, a non-contact point type fire infrared detector or other outdoor fire detectors act to alarm, a non-contact type infrared point temperature instrument or other infrared temperature detectors carry out positioning temperature measurement on the sleeve pipe of each transformer and the flange of a voltage regulating switch, the spontaneous ignition point 332 ℃ of transformer oil is regarded as an ignition temperature critical value, the temperature of a transformer oil fire field is regarded as a fire extinguishing part at 600-700 ℃, the temperature is lower than the fire extinguishing part at the surface of a splash, and meanwhile, in order to avoid false operation, the fire extinguishing part is determined through manual work or monitoring fire images of all sleeve pipes of the transformer, wherein the transformer oil fire field is regarded as a fire extinguishing part at 600-700 ℃ and the temperature is lower than the fire extinguishing part at the surface of the splash, and the fire extinguishing part is determined through manual work or observation: adopting a non-contact point type fire infrared detector to repeatedly alarm and reset the initial fire and the reburning fire; the method comprises the steps of confirming a fire position by using a transformer bushing temperature exceeding 600-700 ℃ plus a fire image, beginning a fire, possibly generating a large-area fire or a local fire, generating an infrared temperature indicator multipoint overtemperature plus a fire image in the large-area fire, controlling all or most of injection control valves of a corresponding fire extinguishing pipe network to open to inject for fire extinguishing in a linkage manner, controlling a single-point overtemperature plus a fire image of the infrared temperature indicator for the local fire to open to inject for fire extinguishing in the linkage manner, and controlling the local injection control valves of the corresponding fire extinguishing pipe network to open to inject for fire extinguishing in the linkage manner. And (4) after-fire, normally, the single-point overtemperature + fire image of the local infrared temperature lighting instrument controls the corresponding local injection control valve of the fire extinguishing pipe network to open for injection fire extinguishing in a linkage manner.

4. External environment monitoring device

Different from the existing fire extinguishing system which is limited to be used below the wind speed of 2m/s by design specifications, the problem of influence of heavy rain on the fire extinguishing effect of the fire extinguishing system is avoided, and the fire extinguishing system is not consistent with the actual using environment. The wind speed/rainfall monitor is arranged on the roof of the dry powder equipment in the safe transformer explosion fire area, and the monitoring image is arranged outside the influence range of the transformer explosion fire and can observe the positions of all sleeve pipe weak parts of the transformer. The wind speed/rainfall signal of the wind speed/rainfall monitor, the transformer power-off signal and the transformer image monitoring image are all connected into the fire linkage controller, and the wind speed value, the transformer power-off signal, the fire alarm signal, the temperature value of each sleeve infrared thermometer of the transformer and the fire panoramic image of the transformer image monitoring image probe are displayed in the starting condition area of the display.

The method comprises the following specific implementation steps: generally, the top or side fire part avoids the wind speed and rainfall time period which influence the fire extinguishing effect, and after the environmental condition is improved, the fire extinguishing system is started to extinguish the fire; usually, the wind speed is determined by the wind speed value, the rainfall is a continuous gradual change process, and needs to be determined by the rainfall value and observation: in general, in the middle rain: rain drops like a line, and raindrops are not easy to distinguish; falling hard earth splashes; water accumulation in the depression is fast; the roof has sand and rain; a rainfall process with the precipitation amount of 5-15 mm in 12 hours or 10-25 mm in 24 hours. In heavy rain: when raining, the people fall into a basin and are blurred; water accumulation in the depression is extremely rapid; the roof has bleepping rain sound; a rainfall process with the rainfall of 15-30 mm within 12 hours or the rainfall of 25-50 mm within 24 hours. During rainstorm: the rainfall process with the rainfall exceeding 50mm within 24 hours is called as rainstorm. When the wind speed and the rainfall of the key fire extinguishing part exceed the standard and do not accord with the starting condition of the dry powder fire extinguishing system, the nitrogen injection fire extinguishing system is started to extinguish fire preferentially, and the dry powder fire extinguishing system is restarted to extinguish fire under the medium rain and the wind speed of 8 m.

5. Dry powder fire extinguishing pipe network

The dry powder fire extinguishing pipe network consists of a fire extinguishing main pipe, subarea selection valves, fire extinguishing distribution pipes, electric injection control valves, fixed or movable fire extinguishing branch pipes, manual injection control valves, weather-proof porous cluster nozzles and the like, wherein the fire extinguishing main pipe 6 is connected with an outlet of dry powder fire extinguishing equipment, the subarea selection valves 7 are connected with different subarea transformer fire extinguishing pipe networks, the fire extinguishing distribution pipes and the fire extinguishing branch pipes are connected behind the subarea fire extinguishing main pipe, each fire extinguishing branch pipe is provided with one injection control valve, the injection control valves and a sleeve fire alarm positioning infrared thermometer are in linkage relation and are connected with an alarm linkage controller, the fire extinguishing branch pipes are connected with the fixed fire extinguishing nozzles, the fixed fire extinguishing nozzles are arranged around a transformer body, and the movable nozzles are arranged near the transformer which is easy to generate transformer oil splashing spreading fire.

The method comprises the following specific implementation steps: the pipe network and the nozzles are arranged at the positions of fire extinguishing agents covering the whole outer surface of the transformer and around the transformer, and generally comprise more than 4-10 unequal fixed nozzles and 1-2 movable nozzles, the nozzles are connected with fire extinguishing branch pipes and then connected with fire extinguishing distribution pipes, fire extinguishing main pipes and dry powder fire extinguishing equipment, each fire extinguishing branch pipe is provided with an injection control valve, the injection control valves are linked with infrared thermometers at sleeve positions or are linked and controlled after the infrared thermometers at the sleeve positions and fire monitoring images are confirmed manually, the infrared thermometers are subjected to single-point or multi-point overtemperature and are linked with the injection control valves at corresponding positions to act, and local or all nozzles are opened to perform injection fire extinguishing. The movable nozzles are arranged at the parts of the transformer where the spread fire disaster occurs, each nozzle is provided with a manual valve, and the surrounding transformer oil splashing spread fire disaster is rescued by manual movement.

6. The nitrogen injection equipment and the oil discharge-cutoff-nitrogen injection pipeline are different from the existing nitrogen injection fire extinguishing system, the nitrogen injection fire extinguishing equipment comprises a nitrogen injection cabinet 27, a nitrogen cylinder group 28, a nitrogen release device 29 and the like, and is different from the existing oil discharge and nitrogen injection device, the nitrogen injection cabinet and a dry powder fire extinguishing equipment room are arranged at a safe position outside the influence range of the explosion fire of the transformer, the alarm, a locking device and a linkage device of the existing oil discharge and nitrogen injection device are simplified, and the equipment is connected with a fire alarm linkage controller of the dry powder-nitrogen injection combined system; the oil discharge-cut-off-nitrogen injection pipeline is respectively composed of an oil discharge pipe 17, an oil discharge valve 18, an oil discharge pipe mechanical maintenance valve 19, a cut-off valve 20, a nitrogen injection fire extinguishing pipeline 21, a nitrogen injection valve 22, a nitrogen injection-oil discharge interlocking valve 23 and a nitrogen injection pipe mechanical maintenance valve 24, one end of the oil discharge pipe is connected with the upper part of a protected body 25, the other end of the oil discharge pipe is connected with an oil discharge system, the oil discharge pipe is provided with the oil discharge pipe mechanical maintenance valve 19 and the oil discharge valve 18, one end of the nitrogen injection pipe is connected with the nitrogen injection fire extinguishing equipment, the other end of the nitrogen injection pipe is connected with a nitrogen injection port at the bottom of the protected body 25, the cut-off valve 20 is arranged on a communicating pipe between a top oil pillow 26 and the protected body, and the nitrogen injection fire extinguishing pipeline 21 is respectively provided with the nitrogen injection pipe mechanical maintenance valve 24, the nitrogen injection-oil discharge interlocking valve 23 and the nitrogen injection valve 22;

the method comprises the following specific implementation steps: different from the existing oil-discharging nitrogen-injecting fire extinguishing device, the nitrogen-injecting cabinet and the dry powder fire extinguishing equipment room are arranged at safe positions outside the influence range of the transformer explosion fire, so that the danger of temperature rise and explosion of the nitrogen cylinder group in the high temperature of a fire scene is avoided; the alarm device, the electric linkage locking device, the mechanical linkage locking device and the fire extinguishing linkage device of the nitrogen injection fire extinguishing equipment are simplified, and a fire alarm linkage control device is shared with a dry powder system, so that the false alarm and the false operation of the fire extinguishing system are reduced; a nitrogen injection-oil discharge interlocking valve is additionally arranged in front of a nitrogen injection valve of the nitrogen injection fire-extinguishing pipeline, and the nitrogen injection pipe is used for mechanically overhauling the valve, the nitrogen injection-oil discharge interlocking valve is used for preventing the nitrogen injection valve from being mistakenly operated, and the nitrogen injection pipe is used for electrified overhauling; the oil discharge pipe and the nitrogen injection cabinet are separately arranged, a mechanical maintenance valve of the oil discharge pipe is added behind an oil discharge valve of the oil discharge pipe, valve maintenance is increased, the failure of the valve is reduced, the nitrogen injection valve, the oil discharge valve, the cut-off valve and the nitrogen injection-oil discharge interlocking valve are all connected to a fire alarm linkage controller,

7. fire alarm and linkage controller and related module

The fire alarm linkage controller consists of a fire alarm controller and a fire linkage controller. The fire extinguishing system comprises a preset starting condition control module, a short-time multi-time spraying module, a fire extinguishing key part priority module, a fire extinguishing control module for a general top fire part and a fire extinguishing control module for a general side fire part.

The method comprises the following specific implementation steps: the fire alarm linkage controller is different from the existing fire extinguishing system, the fire alarm linkage controller adopts a dry powder-nitrogen injection combined system fire alarm linkage controller, the system is connected with a fire part alarm device, an external environment monitoring device, dry powder fire extinguishing equipment, an injection control valve, a nitrogen injection fire extinguishing device, a nitrogen injection oil discharge valve and the like, the injection control valve and a fire alarm positioning infrared thermometer at a sleeve are set to be in linkage relation, a starting condition control module, a short-time multi-time injection module, a fire extinguishing key part priority module, a general top fire extinguishing control module and a general side fire extinguishing control module are preset, a fire extinguishing pipe network and a spray head are accurately controlled to perform key multi-time repeated injection fire extinguishing on the fire part through accurately positioning the fire part, a fire extinguishing agent is saved, and a spreading fire, a continuous fire and a reburning fire are extinguished;

a start condition control module: connect conflagration position warning positioner, external environment monitoring devices, display the infrared some temperature appearance temperature measurement value in positions such as fire alarm, each sleeve pipe of transformer and regulating switch, transformer environment wind speed value, transformer outage signal, transformer control panorama image signal, automatic mode at the controller display screen: the fire detector acts, a multi-point or local single-point temperature measurement value exceeds the standard, the wind speed of the transformer substation reaches the standard (the rainfall reaches the standard), a transformer power-off signal and the like are automatically started to extinguish the fire; manual or telemechanical mode: the fire detector acts, the multi-point or local single-point temperature measurement value exceeds the standard, the wind speed of the transformer substation reaches the standard, the transformer power-off signal and the artificial or transformer monitoring panoramic image confirm the fire position, and the fire is started manually, so that the problems that the transformer substation alarms and malfunctions, and an unattended transformer substation misoperation-prevention fire extinguishing system is not started manually when adopting a manual starting mode are solved;

short-time multiple injection module: the dry powder fire extinguishing system is different from a spray fire extinguishing mode that the existing dry powder fire extinguishing system sprays 60S all at once, wastes fire extinguishing agents, cannot extinguish re-burning fires and simultaneously generates the pollution flashover problem of fire extinguishing agent dust electrical equipment, fire can be extinguished generally about 8S according to a dry powder system fire extinguishing test, most of the dust in fire extinguishing generates chemical reaction with transformer oil fires, the dust can be diffused after fire extinguishing to cause dust pollution flashover, a module adopts a short-time spraying mode that all parts spray for less than 10S, on one hand, the pollution flashover problem of the dust to the electrical equipment is solved, on the other hand, the system has the spraying capacity that all spray heads extinguish fire for 5-6 times and local spray heads for more than 20 times, the fire extinguishing effect is convenient to observe, the fire extinguishing effect is repeated for a plurality of times in a short time, the fire extinguishing and observation are carried out while fire extinguishing, and the concentrated advantage of the fire extinguishing agents is saved, the re-burning fires and sustained fires at key parts are extinguished;

the fire extinguishing key part is a fire extinguishing module with priority: the transformer fire extinguishing system is different from the existing transformer fire extinguishing system in that no matter the fire position, the influence range of explosion fire, the consequence of fire and the serious and insufficient protection for fire extinguishing key positions are considered, no difference between the general fire position protection of fire and the fire extinguishing protection for fire extinguishing key positions is considered, all spray heads are adopted to spray the fire extinguishing agent once in a blind way according to primary and secondary purposes, the limited fire extinguishing agent is wasted, the phenomena that adjacent transformers, surrounding electrical equipment and cables generate spread fire, sustained fire and reburning fire loss can not be avoided, total station voltage loss can be directly caused, the power supply interruption loss of important users is indirectly caused, and meanwhile, the environmental pollution loss and the social influence loss of transformer oil discharged outside the station due to fire fighting by fire brigades are caused are also caused; the linkage controller is provided with a fire extinguishing key part control module, for fire extinguishing key parts, the transformer is firstly determined to have fire extinguishing key parts through transformer explosion fire influence analysis, the specific position of a fire is confirmed according to a fire detector, an infrared temperature indicator superscript and a monitoring image, corresponding fire extinguishing pipe network jet control valves of the fire extinguishing key parts with the infrared temperature indicator exceeding the standard and possibly causing fire loss are linked, and limited fire extinguishing agents are preferentially utilized for fire extinguishing: usually, when the wind speed and the rainfall reach the standard, the external dry powder and the internal nitrogen injection fire extinguishing system at the key fire extinguishing part are started simultaneously to extinguish the fire; the wind speed and the rainfall exceed the standards, and the nitrogen injection fire extinguishing system is started to extinguish fire preferentially when the wind speed and the rainfall do not meet the starting conditions of the dry powder fire extinguishing system; and starting the dry powder fire extinguishing system to extinguish fire when the rain falls to a wind speed of 8 m. The infrared temperature measurement of the primary fire is carried out at multiple points and exceeds the standard, the igniter is linked with all open nozzles of the corresponding fire extinguishing pipe network injection control valve to carry out injection fire extinguishing, the secondary reburning fire is carried out, the temperature measurement of a single point or two points is carried out at the exceeding standard, the igniter is linked with the corresponding fire extinguishing pipe network injection control valve to locally open the nozzles to carry out injection fire extinguishing, and meanwhile, the nitrogen injection system is controlled to carry out continuous cooling fire extinguishing on the continuous reburning fire formed by a large amount of high-temperature transformer oil in the body; in the repeated re-combustion fire, the point thermometer is linked with the local open nozzle of the fire extinguishing pipe network injection control valve at the corresponding part to perform multiple fire extinguishment; during the fire extinguishing period, the fire extinguishing effect is closely observed on site or through monitoring images, the fire extinguishing control error of the fire extinguishing part is corrected, and the fire is extinguished mainly and reignited and sustained in a mode of saving the most fire extinguishing agent and extinguishing multiple times with the highest efficiency by using the limited fire extinguishing agent.

General top sleeve fire position fire extinguishing module: the linkage controller is provided with a fire extinguishing module at the fire position of a common top sleeve, and is specially used for extinguishing fire spreading outside the explosion of the top transformer sleeve and sustaining fire according to the fire characteristics and the fire range of the top sleeve: the infrared temperature measurement of the primary fire is carried out at multiple points and exceeds the standard, the igniter is linked with the corresponding fire extinguishing pipe network injection control valve to open all nozzles to spray for fire extinguishing, the secondary reburning fire is carried out at one point or two points, the temperature measurement of the igniter is carried out at the point and the corresponding fire extinguishing pipe network injection control valve to open local nozzles to spray for fire extinguishing, and meanwhile, the nitrogen injection system is controlled in a linkage manner to carry out continuous cooling and fire extinguishing on the continuous reburning fire formed by a large amount of high-temperature transformer oil in the body; in the repeated re-ignition fire, the point thermometer is linked with the fire extinguishing pipe network injection control valve at the corresponding part to open the local spray head for spraying to extinguish fire for multiple times; during the fire extinguishing period, the fire extinguishing effect is closely observed on site or through monitoring images, the fire extinguishing control error is corrected, and the fire is mainly extinguished, the reignition fire and the continuous fire in a mode of saving the most fire extinguishing agent and extinguishing the fire for multiple times with the highest efficiency by utilizing the limited fire extinguishing agent.

Fire extinguishing module for fire position of general side casing: the linkage controller is provided with a fire extinguishing module at the fire position of a common side sleeve, and is specially used for extinguishing the side transformer explosion fire, the external spreading fire and the sustained fire according to the fire characteristics and the fire range of the side sleeve: fire extinguishing is carried out, infrared temperature measurement of a primary fire disaster is carried out at multiple points and exceeds the standard, a temperature igniter is linked to correspond to a fire extinguishing pipe network injection control valve opening side face spray head at a transformer side face sleeve fire position to carry out all injection fire extinguishing, secondary reburning fire disaster is carried out, temperature measurement of a single point or two points is carried out at the point and exceeds the standard, the temperature igniter is linked to correspond to a fire extinguishing pipe network side face fire extinguishing pipe network injection control valve local opening side face spray head to carry out injection fire extinguishing, and meanwhile, a nitrogen injection system is controlled to carry out continuous cooling fire extinguishing on a continuous reburning fire disaster formed by a large amount of high-temperature transformer oil in a transformer body; in the repeated re-ignition fire, the temperature indicator is linked with the fire extinguishing pipe network injection control valve at the corresponding part to develop local spray heads for spraying to extinguish fire for multiple times; during the fire extinguishing period, the fire extinguishing effect is closely observed on site or through monitoring images, the fire extinguishing control error is corrected, and the fire is mainly extinguished, the reignition fire and the continuous fire in a mode of saving the most fire extinguishing agent and extinguishing the fire for multiple times with the highest efficiency by utilizing the limited fire extinguishing agent.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic plan view of the installation of the present invention;

FIG. 3 is a schematic view of a pipe network according to the present invention;

FIG. 4 is a schematic view of the fire location alarm positioning of the present invention;

FIG. 5 is a schematic view of the external environment monitoring of the present invention;

FIG. 6 is a schematic view of the present invention for preferential fire suppression of a fire-extinguishing locus;

FIG. 7 is a schematic diagram of a typical top sleeve fire location extinguishing;

FIG. 8 is a schematic view of a general side sleeve fire location extinguishing;

fig. 9 is a fire extinguishing control flowchart of the present invention.

Detailed Description

See fig. 1 and 2, the composition structure of the transformer explosion fire extinguishing system

the fire alarm linkage controller of the dry powder-nitrogen injection combined system consists of a fire alarm controller 30 and a fire linkage controller 31, and is connected with a fire part alarm positioning and external environment monitoring device, a set of dry powder fire extinguishing device, a dry powder pipe network injection control valve, a nitrogen injection fire extinguishing device, a nitrogen injection and oil discharge valve and the like;

see figure 3 dry powder fire-extinguishing pipe network and nitrogen injection equipment and oil discharge-cut-off-nitrogen injection pipeline

The nitrogen injection equipment and the oil discharge-cutoff-nitrogen injection pipeline are different from the existing nitrogen injection fire extinguishing system, the nitrogen injection fire extinguishing equipment comprises a nitrogen injection cabinet 27, a nitrogen cylinder group 28, a nitrogen release device 29 and the like, and is different from the existing oil discharge and nitrogen injection device, the nitrogen injection cabinet and a dry powder fire extinguishing equipment room are arranged at a safe position outside the influence range of the explosion fire of the transformer, the alarm, a locking device and a linkage device of the existing oil discharge and nitrogen injection device are simplified, and the equipment is connected with a fire alarm linkage controller of the dry powder-nitrogen injection combined system; the oil discharge-cut-off-nitrogen injection pipeline is respectively composed of an oil discharge pipe 17, an oil discharge valve 18, an oil discharge pipe mechanical maintenance valve 19, a cut-off valve 20, a nitrogen injection fire extinguishing pipeline 21, a nitrogen injection valve 22, a nitrogen injection-oil discharge interlocking valve 23 and a nitrogen injection pipe mechanical maintenance valve 24, one end of the oil discharge pipe is connected with the upper part of a protected body 25, the other end of the oil discharge pipe is connected with an oil discharge system, the oil discharge pipe is provided with the oil discharge pipe mechanical maintenance valve 19 and the oil discharge valve 18, one end of the nitrogen injection pipe is connected with the nitrogen injection fire extinguishing equipment, the other end of the nitrogen injection pipe is connected with a nitrogen injection port at the bottom of the protected body 25, the cut-off valve 20 is arranged on a communicating pipe between a top oil pillow 26 and the protected body, and the nitrogen injection fire extinguishing pipeline 21 is respectively provided with the nitrogen injection pipe mechanical maintenance valve 24, the nitrogen injection-oil discharge interlocking valve 23 and the nitrogen injection valve 22;

referring to fig. 4, the fire alarm positioning device: the transformer fire alarm is different from the existing transformer fire alarm which adopts a cable type constant temperature detector or other detectors, can only alarm the fire once, cannot alarm the reburning fire and position the fire part, leads all spray heads of the fire extinguishing system to blindly spray the fire at one time, sprays too much fire extinguishing agent to the non-fire part, does not sufficiently spray the fire extinguishing agent to the fire extinguishing key part, wastes the fire extinguishing agent, cannot extinguish the reburning fire and sustain the fire; after the existing unattended station fire alarm, the alarm misoperation caused by the failure of confirmation in an automatic operation mode is caused, and the problem of unmanned starting is also faced in a manual starting mode; the invention is provided with a fire position alarming and positioning device which consists of a non-contact fire detector, a non-contact fire temperature positioning detector and a transformer image monitoring probe, wherein the non-contact fire detector generally consists of a point type fire infrared detector or other fire detectors with similar functions and is arranged at two opposite angles outside a transformer; the non-contact fire temperature positioning detector is generally an infrared point temperature instrument or other infrared temperature measuring devices and is arranged on a transformer fire extinguishing system pipe network, and a non-contact infrared point temperature instrument is correspondingly arranged at the high-voltage and medium-voltage three-phase sleeve pipe, a neutral point sleeve pipe, a voltage regulating switch flange and a low-voltage side three-phase sleeve pipe base flange of each transformer; the transformer image monitoring probe is arranged on the top of the transformer and outside the influence range of explosion and fire of the transformer and can observe the positions of all sleeves of the transformer by adopting independent arrangement or sharing the transformer image monitoring probe of the transformer; the non-contact fire detector 1 and the non-contact fire positioning detector 2 are connected with a fire alarm controller 29 through signals, the transformer image monitoring image signals are connected with a fire linkage controller, and a display displays fire alarm, temperature values of infrared thermometers of all sleeves of the transformer and fire overlooking panoramic images of the transformer image monitoring image probes.

See fig. 5, external environment monitoring device: different from the existing fire extinguishing system which is limited to be used below the wind speed of 2m/s by design specifications, the problem of influence of heavy rain on the fire extinguishing effect of the fire extinguishing system is avoided, and the fire extinguishing system is not consistent with the actual using environment. The wind speed/rainfall monitor is arranged on the roof of the dry powder equipment in the safe transformer explosion fire area, and the monitoring image is arranged outside the influence range of the transformer explosion fire and can observe the positions of all sleeve pipe weak parts of the transformer. The wind speed/rainfall signal of the wind speed/rainfall monitor, the transformer power-off signal and the transformer image monitoring image are all connected into the fire linkage controller, and the wind speed value, the transformer power-off signal, the fire alarm signal, the temperature value of each sleeve infrared thermometer of the transformer and the fire panoramic image of the transformer image monitoring image probe are displayed in the starting condition area of the display.

FIG. 6, FIG. 7, FIG. 8, fire alarm and linkage controller and related modules

The method comprises the following specific implementation steps: the fire alarm linkage controller is different from the existing fire extinguishing system, the fire alarm linkage controller adopts a dry powder-nitrogen injection combined system fire alarm linkage controller, the system is connected with a fire part alarm device, an external environment monitoring device, a set of dry powder fire extinguishing device, an injection control valve, a nitrogen injection fire extinguishing device, a nitrogen injection oil discharge valve and the like, the injection control valve and a fire alarm positioning infrared thermometer at a sleeve are set to be in linkage relation, a starting condition control module, a short-time multi-time injection module, a fire extinguishing key part priority module, a general top fire extinguishing control module and a general side fire extinguishing control module are preset, a fire extinguishing pipe network and a spray head are accurately controlled to perform key multi-time repeated injection fire extinguishing on the fire part through accurately positioning the fire part, a fire extinguishing agent is saved, and spreading fire, sustained fire and re-burning fire are extinguished;

See fig. 9, fire suppression control flow: the invention relates to a transformer explosion fire extinguishing control process, which comprises the following steps: the method comprises the steps of initial fire → action of a fire detector → sound and light alarm → manual or image confirmation of fire part → measurement of environmental influences such as wind speed and rainfall → waiting for environmental conditions to become good when exceeding system starting conditions → judgment of existence of fire extinguishing key part → priority starting of a nitrogen injection fire extinguishing system under the conditions of wind speed and heavy rain → manual or remote start of a fire extinguishing key part priority fire extinguishing module after environmental conditions are met → starting of a whole, local and point injection first 10s fire extinguishing of an external dry powder system → system reset → secondary continuous re-combustion fire → action of a fire detector → sound and light alarm → manual or image confirmation of fire part → manual or remote start of an external dry powder fire extinguishing system to extinguish fire according to local and point injection second 10s of fire part, and starting of internal oil discharge and nitrogen injection fire extinguishing to extinguish the continuous re-combustion fire. When no fire-extinguishing key part exists: starting a top or side sleeve fire extinguishing module of a general part of the fire → starting a full, local and point injection primary 10s fire extinguishing of an external dry powder system → system resetting → secondary continuous reburning fire → action of a fire detector → sound and light alarm → manual or image confirmation of the fire part → starting a top or side general part continuous reburning fire extinguishing module → manually or remotely starting the external dry powder extinguishing system to extinguish the fire according to the local and point injection secondary 10s of the fire part, and simultaneously starting internal oil discharge and nitrogen injection fire extinguishing to extinguish the fire and suppress the continuous reburning fire → repeating till extinguishing.

Claims

1. The utility model provides a transformer explosion fire extinguishing system, its characterized in that, this system by fire position warning positioner, external environment monitoring devices, steerable injection range dry powder fire extinguishing pipe network, dry powder fire extinguishing apparatus, oil extraction-cutout-notes nitrogen pipeline, notes nitrogen fire extinguishing apparatus and have multiple control module's dry powder-notes nitrogen combined system fire alarm linkage controller part constitute, wherein:

the fire position alarming and positioning device consists of a non-contact fire detector (1), a non-contact fire temperature positioning detector (2) and a transformer image monitoring probe (3), and is connected with a fire alarming linkage controller of a dry powder-nitrogen injection combined system;

the external environment monitoring device consists of a wind speed/rainfall monitor (4), a transformer power-off signal monitor (5) and a transformer image monitoring probe (3), and is connected with the fire alarm linkage controller of the dry powder-nitrogen injection combined system;

the dry powder fire extinguishing pipe network consists of a fire extinguishing main pipe (6), a partition selection valve (7), a fire extinguishing distribution pipe (8), an electric injection control valve (9), a fixed fire extinguishing branch pipe, a movable fire extinguishing branch pipe, a manual injection control valve (11) and a weather-proof porous cluster nozzle (12), wherein the fire extinguishing main pipe (6) is connected with an outlet of dry powder equipment;

the dry powder fire extinguishing equipment consists of an equipment room (13), a boiling powder storage tank (14) arranged in the equipment room (13), a dry powder driving gas bottle group (15) and a starting bottle group (16), wherein the starting bottle group (16) is connected with the dry powder driving gas bottle group (15) through a starting gas pipeline, the dry powder driving gas bottle group (15) is connected with the boiling powder storage tank (14) through a driving gas pipeline, and the outlet of the boiling powder storage tank (14) is connected with a fire extinguishing main pipe (6);

the oil discharge-cut-off-nitrogen injection pipeline consists of an oil discharge pipe (17), an oil discharge valve (18), an oil discharge pipe mechanical maintenance valve (19), a cut-off valve (20), a nitrogen injection fire extinguishing pipeline (21), a nitrogen injection valve (22), a nitrogen injection-oil discharge interlocking valve (23) and a nitrogen injection pipe mechanical maintenance valve (24), one end of an oil discharge pipe is connected with the upper part of the protected transformer, one end of the oil discharge pipe is connected into an oil discharge system, the oil discharge pipe is provided with an oil discharge pipe mechanical maintenance valve (19) and an oil discharge valve (18), one end of a nitrogen injection fire extinguishing pipeline is connected with nitrogen injection fire extinguishing equipment, the other end of the nitrogen injection fire extinguishing pipeline is connected into a nitrogen injection port at the bottom of the protected transformer, a cut-off valve (20) is arranged on a communicating pipe between a top oil conservator (26) and the protected transformer, and a nitrogen injection pipe mechanical maintenance valve (24), a nitrogen injection-oil discharge interlocking valve (23) and a nitrogen injection valve (22) are respectively arranged on the nitrogen injection fire extinguishing pipeline (21);

the nitrogen injection fire extinguishing equipment consists of a nitrogen injection cabinet (27), a nitrogen cylinder group (28) and a nitrogen releasing device (29), and the nitrogen releasing device is connected with a nitrogen injection fire extinguishing pipeline (21);

the fire alarm linkage controller of the dry powder-nitrogen injection combined system consists of a fire alarm controller (30) and a fire linkage controller (31), and is connected with a fire part alarm positioning device, an external environment monitoring device, dry powder fire extinguishing equipment, an electric injection control valve, nitrogen injection fire extinguishing equipment, an oil discharge valve, a stop valve, a nitrogen injection valve and a nitrogen injection-oil discharge linkage valve;

the non-contact fire detector in the fire position alarm positioning device consists of a point type fire infrared detector or other fire detectors with similar functions, and is arranged at two opposite angles outside the transformer; the non-contact fire temperature positioning detector adopts an infrared point temperature instrument or other infrared temperature measuring devices and is arranged on a transformer fire extinguishing system pipe network, and a non-contact infrared point temperature instrument is correspondingly arranged at the high-voltage and medium-voltage three-phase sleeve pipe, the neutral point sleeve pipe, the voltage regulating switch flange and the low-voltage side three-phase sleeve pipe base flange of each transformer; the transformer image monitoring probes are arranged independently or jointly and are arranged on the top of the transformer and outside the influence range of the explosion and fire of the transformer, and the positions of all sleeves of the transformer can be observed; signals of the non-contact fire detector (1), signals of the non-contact fire temperature positioning detector (2) and a fire panoramic image of the transformer are all connected into a fire alarm controller (30);

the electric injection control valve is in linkage relation with the non-contact infrared point temperature instrument and is connected with the alarm linkage controller, the weather-proof porous cluster nozzle (12) is connected to the fire extinguishing branch pipe, the weather-proof porous cluster nozzle (12) is arranged around the transformer body, the movable fire extinguishing branch pipe is provided with the manual injection control valve, and the movable fire extinguishing branch pipe is arranged near a fire disaster which is easily splashed by transformer oil and spreads by the transformer;

a dry powder-nitrogen injection combined system fire alarm linkage controller with various control modules comprises: the fire extinguishing system comprises a preset starting condition control module, a short-time multi-spraying module, a fire extinguishing key part priority module, a general top fire extinguishing control module and a general side fire extinguishing control module; the fire extinguishing key position refers to a fire position which can cause adjacent transformers, electrical equipment and cables to spread fire or a fire position which causes total station voltage loss of a transformer substation, power failure of important users and fire environmental pollution.

2. The transformer explosion fire extinguishing system according to claim 1, wherein the wind speed/rainfall monitor (4) of the external environment monitoring device is arranged on the roof of the dry powder equipment in the safety area of the transformer explosion fire, the wind speed/rainfall signal of the wind speed/rainfall monitor, the transformer power-off signal and the transformer image monitoring panoramic image are all connected to the fire linkage controller, and the wind speed/rainfall value, the transformer power-off signal, the fire alarm signal, the temperature value of each non-contact infrared thermometer of the transformer and the transformer image monitoring fire panoramic image are displayed in the display starting condition area.

3. The transformer explosion fire extinguishing system according to claim 1, wherein the main extinguishing pipe (6) in the dry powder extinguishing pipe network is connected with the outlet of the dry powder extinguishing equipment, the subarea selection valves (7) are connected with different subarea transformer dry powder extinguishing pipe networks, the subarea main extinguishing pipe is connected with the extinguishing distribution pipe and the extinguishing branch pipes, and each fixed extinguishing branch pipe is provided with an electric injection control valve.

4. The transformer explosion fire suppression system of claim 1, wherein the nitrogen injection cabinet and the dry powder fire suppression equipment room are arranged at a safe location outside the influence range of the transformer explosion fire.