CN115040808A - Immersed fire extinguishing device for high-voltage bushing of ultra-high voltage transformer - Google Patents
Immersed fire extinguishing device for high-voltage bushing of ultra-high voltage transformer Download PDFInfo
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- CN115040808A CN115040808A CN202210667269.XA CN202210667269A CN115040808A CN 115040808 A CN115040808 A CN 115040808A CN 202210667269 A CN202210667269 A CN 202210667269A CN 115040808 A CN115040808 A CN 115040808A
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- oil
- fire extinguishing
- sleeve
- gas
- storage bin
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/005—Delivery of fire-extinguishing material using nozzles
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
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- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Housings And Mounting Of Transformers (AREA)
- Insulators (AREA)
Abstract
The invention discloses an immersed fire extinguishing device for a high-voltage bushing of an ultra-high voltage transformer, which mainly comprises the following components: contain gaseous unit of putting out a fire, cooling water circulation unit, pneumatic cylinder power pack, accident oil extraction unit and the control unit, when high-voltage bushing takes place the conflagration, the sleeve of putting out a fire rises under the effect of pneumatic cylinder, form a relatively inclosed space outside high-voltage bushing, the gas shower nozzle of installation constantly sprays gas in the high-voltage bushing and puts out a fire, the water pipe from the top down circulation flow of spiral arrangement in the cooling water follow high-voltage bushing, take away the heat that most conflagration produced, high-voltage bushing catches fire and breaks the back, its inside insulating oil can flow into the oil gas storage storehouse of lower part, treat that insulating oil flame extinguishes the back and discharge accident oil sump again. The fire extinguishing device is reliable in structure, can effectively extinguish the high-voltage bushing fire of the ultra-high voltage transformer, and directly solves the problem that the high-voltage bushing fire is difficult to extinguish in time from the root through the telescopic fire extinguishing sleeve, the gas fire extinguishing unit and the cooling water circulating unit.
Description
Technical Field
The invention relates to the technical field of fire safety of large oil-filled equipment of an electric power system, in particular to an immersed fire extinguishing device for a high-voltage bushing of an ultra-high voltage transformer.
Background
The main transformer in the extra-high voltage transformer substation is a large-scale oil-filled device, and the total weight of a single-phase transformer is about 400 tons, wherein the weight of insulating oil is about 100 tons. The height of the transformer body is about 5 meters generally, and the highest point can reach about 14.5 meters by adding equipment such as an oil conservator and a high-voltage bushing which are matched with the transformer. At present, a foam spraying fire extinguishing system or a water fire extinguishing system is generally adopted by an ultrahigh-voltage transformer substation, and because the height of a high-voltage bushing is higher, an on-site fire extinguishing device is generally only used for protecting a transformer body, the foam spraying fire extinguishing system or the water fire extinguishing system has the advantages that foam mixed liquid or mist water sprayed out by a nozzle of the foam spraying fire extinguishing system can only cover transformer body equipment, the protection range of the foam spraying fire extinguishing system or the water fire extinguishing system is limited, and the high-voltage bushing is a blind area for fire safety. The internal oil charge of oil-filled equipment such as a high-voltage bushing of a transformer is generally about several tons, if the high-voltage bushing catches fire, the fire is dangerous and can spread to the transformer body, further, the insulating oil in the transformer body is burnt, and an event that the high-voltage bushing catches fire happens in a certain company before. In addition, the ultrahigh voltage transformer substation is generally built in an unmanned area far away from a downtown area or a county city, the distance between the ultrahigh voltage transformer substation and a nearest fire brigade is dozens of kilometers, the distance between the ultrahigh voltage transformer substation and the nearest fire brigade is hundreds of kilometers, and if a transformer bushing catches fire, the fire rescue force cannot timely rescue the transformer bushing.
Disclosure of Invention
The invention aims to solve the technical problem that the anti-falling hook device for the grounding wire with the rotary cross rod seal is reliable in structure, can effectively extinguish the high-voltage bushing fire of the ultra-high voltage transformer, and directly solves the problem that the high-voltage bushing fire is difficult to extinguish in time from the root through the telescopic fire extinguishing sleeve, the gas fire extinguishing unit and the cooling water circulating unit.
The technical scheme adopted by the invention for solving the technical problems is as follows: an immersed fire extinguishing device for a high-voltage bushing of an ultra-high voltage transformer comprises a gas fire extinguishing unit, a cooling water circulating unit, a hydraulic cylinder power unit, an accident oil discharging unit and a control unit;
the gas fire extinguishing unit consists of a fire extinguishing gas inlet pipe, a fire extinguishing sleeve, a gas nozzle and a sleeve lower connecting body, wherein one end of the fire extinguishing gas inlet pipe is installed on the hydraulic cylinder power unit, the other end of the fire extinguishing gas inlet pipe is installed on the fire extinguishing sleeve, the sleeve lower connecting body is fixedly installed at the bottom of the high-pressure sleeve, the bottom of the sleeve lower connecting body is in contact with the bottom of the high-pressure sleeve, the contact part of the bottom of the sleeve lower connecting body and the bottom of the high-pressure sleeve is provided with an oil gas discharge port with adjustable size, the bottom of the fire extinguishing sleeve is fixedly installed on the sleeve lower connecting body, the fire extinguishing sleeve is foldable, the gas nozzle is installed on the inner side of the top end of the fire extinguishing sleeve, and the gas nozzle is provided with a plurality of gas nozzles;
the cooling water circulation unit consists of a cooling water inlet pipe, a water taking pipe and a water pump chamber, wherein one end of the cooling water inlet pipe is installed on the hydraulic cylinder power unit, the other end of the cooling water inlet pipe is installed on the fire extinguishing sleeve, one end of the water taking pipe is connected with the fire pool, the other end of the water taking pipe is connected with the water pump chamber, a water pump and a refrigeration compressor are installed in the water pump chamber, the water pipe is installed on the inner wall of the fire extinguishing sleeve, the water pipe is spirally arranged on the inner wall of the fire extinguishing sleeve from top to bottom, and a cooling water outlet is formed in the bottom of the fire extinguishing sleeve;
the hydraulic cylinder power unit comprises a cylinder barrel, a multi-stage piston rod, a cylinder barrel lacing wire and a cylinder barrel base, the cylinder barrel is a hydraulic cylinder barrel, the multi-stage piston rod comprises a first piston rod, a second piston rod, a third piston rod and a fourth piston rod, the second piston rod is arranged in the first piston rod, the third piston rod is arranged in the second piston rod, the fourth piston rod is arranged in the third piston rod, the cylinder barrel is fixedly arranged on the cylinder barrel base, and the cylinder barrel lacing wire is arranged between the cylinder barrel and the cylinder barrel base;
the oil discharge unit for the accident comprises an oil discharge layer, a sleeve oil discharge port, an oil discharge pipe, an exhaust valve, an oil gas storage bin, an oil storage bin and an oil discharge port outside the oil storage bin, wherein the oil discharge layer is positioned below an exhaust layer, the upper part of the oil discharge layer is open, the lower part of the oil discharge layer is sealed, the bottom of the oil discharge layer is provided with the sleeve oil discharge port, the upper end of the oil discharge pipe is connected with the sleeve oil discharge port, the lower end of the oil discharge pipe is arranged in the oil gas storage bin, the upper part of the oil gas storage bin is a gas storage bin, the exhaust valve is arranged on a gas outlet at the top end of the gas storage bin, the lower part of the oil gas storage bin is the oil storage bin, the left side of the oil storage bin is provided with an oil storage bin oil inlet and the height of the oil storage bin is lower than the central line of the oil gas storage bin, an air inlet pipe of the oil storage bin is positioned at the middle position of the lower part of the oil storage bin, and the oil discharge port is positioned at the lower part of the oil storage bin, the height of the oil outlet outside the oil storage bin is consistent with that of the oil outlet inside the oil storage bin, and the oil outlet outside the oil storage bin is connected with the emergency oil pool through a pipeline;
the control unit consists of a console, an on-site control chamber, an air storage chamber and a water pump chamber, wherein the on-site control chamber is connected with the console, the air storage chamber and the water pump chamber are both connected with the console, and the console is connected with the hydraulic power unit.
Further, the method comprises the following steps: the gas sprayed by the gas spray heads in the gas fire extinguishing unit has two directions, one direction faces the high-voltage bushing and slightly inclines downwards for a certain angle, the other direction is along the inner wall of the fire extinguishing sleeve and slightly inclines downwards for a certain angle, the gas sprayed by the two adjacent gas spray heads are mutually interwoven, and the gas tracks of the two adjacent gas spray heads form a net-shaped structure in space.
Further, the method comprises the following steps: the hydraulic cylinder power unit is provided with a fire extinguishing gas pipeline and a cooling water pipeline, the gas pipeline is mainly divided into two paths which enter from the bottom of the cylinder barrel, one path of gas pipeline rises along the center of the hydraulic cylinder and enters a fire extinguishing gas inlet pipe after reaching the top of the fourth piston rod, and finally the fire extinguishing gas inlet pipe is sprayed by a gas spray head; the other path of gas pipeline is led out from the cylinder barrel base, laid along the ground, enters an air inlet pipe of the oil storage bin and then enters the oil storage bin; the cooling water pipeline enters from the bottom of the cylinder barrel, rises along the center of the hydraulic cylinder, enters the cooling water inlet pipe after reaching the top of the fourth piston rod, and cooling water in the water inlet pipe enters the internal circulation of the fire extinguishing sleeve through the water inlet of the fire extinguishing sleeve, and finally returns to the fire pool through the water outlet of the fire extinguishing sleeve and the water discharge pipe after circulation.
Further, the method comprises the following steps: when the fire extinguishing sleeve is folded, the upper part of the fire extinguishing sleeve is provided with a rainproof and dustproof sealing measure, and the fire extinguishing sleeve is automatically pushed open when rising; the fire extinguishing sleeve can be lifted along with the lifting of the hydraulic cylinder, and a relatively closed cylindrical space is formed around the high-pressure sleeve.
Further, the method comprises the following steps: connector is including putting out a fire sleeve and high-tension bushing joint position, oil gas escape orifice, spout and filler strip under the sleeve, put out a fire sleeve and high-tension bushing joint position under initial condition, draw in by putting out a fire sleeve bottom structure and draw in directly and laminate mutually with high-tension bushing bottom basis, after the high-tension bushing takes place the fire disaster, put out a fire sleeve and high-tension bushing joint position can use the centre of a circle to open as the automatic outside expansion in center, and the open degree of oil gas escape orifice is directly proportional with the sleeve of putting out a fire and the outward expansion degree of high-tension bushing joint position this moment, spout and filler strip are the supplementary utensil of putting out a fire sleeve and high-tension bushing joint position adduction and outward expansion.
Further, the method comprises the following steps: the fire extinguishing sleeve is made of non-combustible materials, has good flame retardant property and good mechanical wear resistant effect, a cooling water pipeline is installed in the inner wall of the fire extinguishing sleeve, the cooling water pipeline surrounds the fire extinguishing sleeve in a spiral mode from top to bottom, and cooling water enters from the upper portion of the cooling water pipeline and flows out from the lower portion of the cooling water pipeline.
Further, the method comprises the following steps: the gas nozzle is inclined towards the lower part of the fire extinguishing sleeve in the installation mode.
Further, the method comprises the following steps: the exhaust layer is a cylinder with a plurality of exhaust holes, the section of the cylinder is consistent with that of the fire extinguishing sleeve, and the exhaust holes in the exhaust layer can be automatically or manually closed.
Further, the method comprises the following steps: the upper surface and the lower surface of the exhaust layer are provided with openings, the upper surface of the exhaust layer is directly connected with the fire extinguishing sleeve and is used for bearing oil-gas mixtures discharged from an oil-gas discharge port in the joint of the fire extinguishing sleeve and the high-voltage sleeve, the lower surface of the exhaust layer is directly connected with an oil discharge layer, the oil-gas mixtures are sequentially separated in the exhaust layer, and the gas mixtures are discharged from exhaust holes in the exhaust layer.
Further, the method comprises the following steps: the oil drainage layer is a cylinder with a casing oil drainage port at the bottom, the cross section of the cylinder is consistent with that of the fire extinguishing sleeve, and the casing oil drainage port is normally open.
Further, the method comprises the following steps: the oil drainage layer is provided with an opening, the upper surface of the oil drainage layer is directly connected with an exhaust layer, the lower surface of the oil drainage layer is a closed surface with a sleeve oil drainage port, the upper surface of the oil drainage layer is provided with an opening, the mixed oil after the exhaust layer is separated by the oil drainage layer is collected for a short time, and the mixed oil is discharged into a lower oil gas storage bin through the sleeve oil drainage port.
Further, the method comprises the following steps: the oil gas storage bin comprises a gas storage bin, an oil inlet of the oil storage bin, an air inlet of the oil storage bin, an exhaust valve, an oil outlet in the oil storage bin and an oil outlet outside the oil storage bin, and the oil gas storage bin is of a cylindrical structure.
Further, the method comprises the following steps: the oil inlet of the oil storage bin is positioned at three quarters of the lower part of the oil-gas storage bin, and the height of the oil inlet is higher than that of the oil outlet in the oil storage bin so as to ensure that the insulating oil is completely extinguished to the accident oil pool after the flame is completely extinguished.
Further, the method comprises the following steps: the oil outlet in the oil storage bin and the oil outlet outside the oil storage bin form a communicated structure, and the highest point of the structure is the highest surface of the oil storage.
Further, the method comprises the following steps: the oil discharge pipe and the drain pipe are arranged side by side, and the oil discharge pipe and the drain pipe are attached to the high-voltage sleeve lifting seat on the vertical surface.
According to the invention, the gas fire extinguishing unit, the cooling water circulation unit, the hydraulic cylinder power unit, the accident oil discharging unit and the control unit are utilized, so that a fire can be extinguished at the initial stage of a fire of the high-voltage bushing, the high-voltage bushing is only required to be maintained or replaced after the fire breaks out, the body is subjected to insulating oil test, the whole transformer or adjacent electrical equipment is not burnt due to a linked reaction, and the economic loss caused by an accidental fire is directly reduced to the greatest extent from the source; secondly, the fire hazard is extinguished as early as possible in time, the damage caused by explosion after the large oil-filled equipment is ignited can be prevented, and the production and property safety of national personnel is guaranteed; in addition, the shapes and the sizes of the line high-voltage reactor and the transformer in the ultrahigh-voltage power grid are basically the same, and the shapes and the sizes of the high-voltage bushings are also similar, so that the device is also suitable for the high-voltage reactor of the ultrahigh-voltage system; in an extra-high voltage converter station, the device is also suitable for corresponding converter transformers and the like.
The working principle of the invention is as follows: under normal conditions, piston rods of all levels of the hydraulic cylinder are stored in the cylinder barrel, the fire extinguishing sleeve is folded and placed at the bottom of the high-voltage sleeve, and a rain-proof and dust-proof sealing structure is arranged on the fire extinguishing sleeve; when the high-voltage bushing is on fire, the high, middle and low sides of the transformer trip out, and simultaneously two groups of fire detectors with different principles on the high-voltage bushing act, a control unit of the device automatically starts, a hydraulic cylinder rises within 5 seconds, piston rods at all levels rise, and meanwhile, a fire extinguishing sleeve is driven to rise, and the fire extinguishing sleeve forms a relatively closed space around the high-voltage bushing; when the fire extinguishing sleeve is just lifted, the gas nozzle starts to spray fire extinguishing gas which does not support combustion, the fire extinguishing gas is sprayed towards the high-voltage bushing and along the inner wall of the fire extinguishing sleeve simultaneously, and the gas sprayed by the gas nozzle is full of the whole fire extinguishing sleeve and continuously sprayed after the fire extinguishing sleeve is completely lifted; when the fire extinguishing sleeve is just lifted up, cooling water enters the fire extinguishing sleeve through a water inlet in the upper part of the fire extinguishing sleeve, spirally flows downwards along the fire extinguishing sleeve, then flows out of the fire extinguishing sleeve from a water outlet in the lower part of the fire extinguishing sleeve, and finally flows back to a fire pool; the cooling water circulation system is provided with a compressor, and the cooling water can take away heat generated by a fire disaster of the high-voltage bushing, so that the high-voltage bushing is helped to be rapidly cooled and put out a fire, meanwhile, the fire-extinguishing sleeve is protected, and the service life of the fire-extinguishing sleeve is prolonged; the joint part of the sleeve and the sleeve at the bottom of the fire extinguishing sleeve is normally and tightly combined, after a fire occurs, the joint part of the sleeve and the sleeve can be automatically or manually opened, the oil gas discharge port is gradually opened from closed, and the opening degree of the oil gas discharge port is controlled by a control unit or manually; the gas sprayed into the fire extinguishing sleeve can wrap residual air in the fire extinguishing sleeve or other combustible gas generated by combustion and enter an exhaust layer at the lower part of the fire extinguishing sleeve through an oil gas discharge port until the fire extinguishing sleeve is filled with the fire extinguishing gas, so that flame of the high-pressure sleeve is extinguished; the mixed gas entering the exhaust layer can not be combusted generally, and if the mixed gas is combusted, the mixed gas can be directly sprayed and combusted from the exhaust hole of the exhaust layer, so that the fire extinguishing effect of the device is not influenced; if the high-voltage sleeve generates the problem of insulating oil leakage due to ignition, the insulating oil can directly pass through the oil gas discharge port and the exhaust layer, finally flows into the oil discharge pipe through the sleeve oil discharge port by the collection of the oil discharge layer, and then flows into the oil storage bin; if the insulating oil flowing out of the fire-extinguishing sleeve is still combusted, the fire-extinguishing gas sprayed from the oil gas discharge port by the fire-extinguishing sleeve can extinguish the fire for the first time in the process that the insulating oil flows through the exhaust layer and is collected in the oil discharge layer; if the insulating oil is continuously combusted and flows into the oil gas storage bin, the gas storage bin at the upper part of the oil gas storage bin can extinguish the fire for the second time until the flame is extinguished; after the insulating oil is put out a fire twice, the insulating oil is discharged to an accident oil pool through a communicating structure consisting of an oil outlet inside the oil storage bin and an oil outlet outside the oil storage bin.
The invention has the following beneficial effects: the fire disaster of the high-voltage bushing of the ultra-high voltage transformer can be effectively suppressed, and the problem that the fire disaster of the high-voltage bushing is difficult to suppress in time is directly solved from the source through the telescopic fire extinguishing sleeve, the gas fire extinguishing unit, the cooling water circulating unit and the oil gas storage bin; when the high-voltage bushing is in a fire, the fire extinguishing sleeve is lifted under the action of the hydraulic cylinder, and a relatively closed space is formed outside the high-voltage bushing; in the lifting process of the fire extinguishing sleeve, the gas nozzle arranged in the high-pressure sleeve continuously sprays gas to extinguish fire; cooling water circularly flows from top to bottom through a water pipe spirally arranged in the high-pressure sleeve, and most of heat generated by fire is taken away; after the high-voltage bushing is ignited and broken, the insulating oil in the high-voltage bushing can flow into the temporary oil gas storage bin at the lower part, and is discharged to the accident oil pool after the flame of the insulating oil is extinguished.
Drawings
FIG. 1 is a front elevation view of a fire sleeve according to an embodiment of the present invention;
FIG. 2 is an elevated front view of a fire sleeve according to an embodiment of the present invention;
FIG. 3 is a non-raised top view of a fire sleeve according to an embodiment of the present invention;
FIG. 4 is a front view of the main transformer of the present invention without the fire suppression unit;
FIG. 5 is a top view of the main transformer of the present invention without the addition of a fire extinguishing unit;
FIG. 6 is a schematic diagram of the control principle of the present invention;
FIG. 7 is a schematic view of the hydraulic cylinder of the present invention;
FIG. 8 is a schematic view of the fire sleeve construction of the present invention;
FIG. 9 is a graph of the effect of gas injection according to the present invention;
FIG. 10 is a diagram showing the effect of the cooling water circulation in the fire extinguishing sleeve according to the present invention;
FIG. 11 is a schematic view of the lower connecting body structure of the sleeve of the present invention;
FIG. 12 is a schematic view of the initial structure of the lower connector of the sleeve of the present invention;
FIGS. 13-1 and 13-2 are schematic views of the sleeve lower connector of the present invention after being opened;
FIG. 14 is a diagram of the oil storage fire extinguishing structure of the present invention;
FIG. 15 is a front view of the oil drain pipe and the oil storage fire extinguishing structure of the present invention;
FIG. 16 is a front view of the drain and oil and gas storage bin construction of the present invention.
Description of reference numerals:
1-grading ring, 2-cooling water inlet pipe, 3-fire extinguishing gas inlet pipe, 4-first stage piston rod, 5-second stage piston rod, 6-third stage piston rod, 7-fourth stage piston rod, 8-cylinder, 9-cylinder tie bar, 10-cylinder base, 11-fire extinguishing sleeve, 12-lower sleeve connector, 13-oil drainage layer, 14-air drainage layer, 15-air drainage hole, 16-cooling water outlet, 17-sleeve oil outlet, 18-oil drainage pipe, 19-lifting seat, 20-air drainage valve, 21-gas storage bin, 22-highest oil storage surface, 23-oil gas storage bin, 24-oil storage bin, 25-oil storage bin oil inlet, 26-oil storage bin air inlet pipe, 27-oil storage bin air inlet pipe, 28-oil storage bin inner oil discharge port, 29-oil storage bin outer oil discharge port, 30-oil conservator, 31-medium pressure side sleeve, 32-low pressure side sleeve, 33-large cover, 34-cooler, 35-fan, 36-transformer body, 37-oil pump, 38-protection range highest point, 39-high pressure sleeve, 40-sleeve highest point, 41-sleeve lowest point, 42-sleeve current transformer, 43-accident oil pool, 44-local control room, 45-control piano platform, 46-air storage room, 47-water intake pipe, 48-water pump room, 49-fire extinguishing sleeve and high pressure sleeve joint part, 50-gas nozzle, 51-gas sprayed to sleeve, 52-gas sprayed along sleeve, 53-water inlet, 54-water flow direction, 55-water pipe, 56-water outlet, 57-oil gas discharge port, 58-sliding chute, 59-filler strip, 60-enlarged combination part, 61-enlarged oil gas discharge port, 62-lifting seat support and 63-drain pipe.
Detailed Description
The following description of the embodiments of the invention refers to the accompanying drawings and examples:
fig. 1 to 16 show a specific embodiment of the present invention, which is an immersed fire extinguishing apparatus for a high-voltage bushing of an ultra-high voltage transformer, comprising a gas fire extinguishing unit, a cooling water circulating unit, a hydraulic cylinder power unit, an accident oil discharging unit and a control unit;
the gas fire extinguishing unit comprises a fire extinguishing gas inlet pipe 3, a fire extinguishing sleeve 11, a gas nozzle 50 and a sleeve lower connecting body 12, wherein one end of the fire extinguishing gas inlet pipe 3 is installed on the hydraulic cylinder power unit, the other end of the fire extinguishing gas inlet pipe 3 is installed on the fire extinguishing sleeve 11, the sleeve lower connecting body 12 is fixedly installed at the bottom of the high-pressure sleeve 39, the bottom of the sleeve lower connecting body 12 is in contact with the bottom of the high-pressure sleeve 39, the contact part of the bottom of the sleeve lower connecting body is provided with an oil gas discharge port 57 with adjustable size, the bottom of the fire extinguishing sleeve 11 is fixedly installed on the sleeve lower connecting body 12, the fire extinguishing sleeve 11 is foldable, the gas nozzle 50 is installed on the inner side of the top end of the fire extinguishing sleeve 11, and the gas nozzle 11 is provided with a plurality of gas discharge ports;
the cooling water circulation unit consists of a cooling water inlet pipe 2, a water pipe 55, a water taking pipe 47 and a water pump chamber 48, one end of the cooling water inlet pipe 2 is installed on the hydraulic cylinder power unit, the other end of the cooling water inlet pipe 2 is installed on the fire extinguishing sleeve 11, one end of the water taking pipe 47 is connected with a fire pool, the other end of the water taking pipe 47 is connected with the water pump chamber 48, a water pump and a refrigeration compressor are installed in the water pump chamber 48, the water pipe 55 is installed on the inner wall of the fire extinguishing sleeve 11, the water pipe 55 is spirally arranged on the inner wall of the fire extinguishing sleeve 11 from top to bottom, and the bottom of the fire extinguishing sleeve 11 is provided with a cooling water outlet 16;
the hydraulic cylinder power unit comprises a cylinder barrel 8, a multi-stage piston rod, a cylinder barrel lacing wire 9 and a cylinder barrel base 10, wherein the cylinder barrel 8 is a hydraulic cylinder barrel, the multi-stage piston rod comprises a first piston rod 4, a second piston rod 5, a third piston rod 6 and a fourth piston rod 7, the second piston rod 5 is installed in the first piston rod 4, the third piston rod 6 is installed in the second piston rod 5, the fourth piston rod 7 is installed in the third piston rod 6, the cylinder barrel 8 is fixedly installed on the cylinder barrel base 10, and the cylinder barrel lacing wire 9 is installed between the cylinder barrel 8 and the cylinder barrel base 10;
the oil discharge unit of accident comprises oil discharge layer 13, sleeve pipe oil drain port 17, oil discharge pipe 18, discharge valve 20, oil gas storage bin 23, oil storage bin 24, oil storage bin interior oil discharge port 28 and oil storage bin exterior oil discharge port 29, oil discharge layer 13 is located exhaust layer 14 below, oil discharge layer 13 upper portion opening and oil discharge layer 13 lower part are sealed, oil discharge layer 13 bottom is equipped with sleeve pipe oil drain port 17, oil discharge pipe 18 upper end is connected with sleeve pipe oil drain port 17 and the oil discharge pipe 18 lower extreme is installed in oil gas storage bin 23, oil gas storage bin 23 upper portion is gas storage bin 21, discharge valve 20 installs on gas storage bin 21 top gas outlet, oil gas storage bin 23 lower part is oil storage bin 24, oil storage bin 24 left side is equipped with oil storage bin oil inlet 25 and oil storage bin oil inlet 25 height is below oil gas bin 23 central line, oil storage bin intake pipe 27 gets into by oil storage bin 24 lower part, the oil storage bin air inlet 27 is positioned in the middle of the lower part of the oil storage bin 24, the oil storage bin inner oil discharge port 28 is positioned at the lower part of the oil storage bin 24, the height of the oil storage bin outer oil discharge port 29 is consistent with that of the oil storage bin inner oil discharge port 28, and the oil storage bin outer oil discharge port 29 is connected with the emergency oil pool 43 through a pipeline;
the control unit consists of a console 45, a local control chamber 44, an air storage chamber 46 and a water pump chamber 48, wherein the local control chamber 44 is connected with the console 45, the air storage chamber 46 and the water pump chamber 48 are both connected with the console 45, and the console 45 is connected with the hydraulic power unit.
Preferably, the gas nozzles 50 in the gas fire extinguishing unit emit gas in two directions, one direction is towards the high-voltage bushing 39 and slightly inclined downwards, the other direction is along the inner wall of the fire extinguishing sleeve 11 and slightly inclined downwards, the gas emitted from two adjacent gas nozzles 50 are interlaced, and the gas tracks form a net-shaped structure in space.
Preferably, the hydraulic cylinder power unit is provided with a fire extinguishing gas pipeline and a cooling water pipeline, the fire extinguishing gas pipeline is mainly divided into two paths, the fire extinguishing gas pipeline enters from the bottom of the cylinder barrel 8, one path of gas pipeline rises along the center of the hydraulic cylinder, enters the fire extinguishing gas inlet pipe 3 after reaching the top of the fourth piston rod 7, and is finally sprayed by the gas spray nozzle 50; the other path of fire extinguishing gas pipeline is led out from the cylinder barrel base 10, laid along the ground, enters an air inlet pipe 26 of the oil storage bin and then enters an oil storage bin 24; the cooling water pipeline gets into from 8 bottoms on the cylinder, rises along the pneumatic cylinder center, reentries cooling water inlet tube 2 behind the 7 tops on fourth piston rod, and the inlet tube internal cooling water gets into the internal circulation of fire extinguishing sleeve 11 through the 11 water inlets of fire extinguishing sleeve, through the 11 delivery ports of fire extinguishing sleeve after the circulation, rethread drain pipe 63, gets back to the fire-fighting water pond again at last.
Preferably, when the fire extinguishing sleeve 11 is folded and placed, the upper part of the fire extinguishing sleeve is provided with a rainproof and dustproof sealing measure, and the fire extinguishing sleeve 11 is automatically jacked to open the sealing measure when lifted; the extinguishing sleeve 11 can be raised with the raising of the hydraulic cylinder and forms a relatively closed cylindrical space around the high-pressure bushing 39.
Preferably, sleeve lower connector 12 includes fire extinguishing sleeve and high-voltage bushing joint portion 49, oil gas escape orifice 57, spout 58 and filler strip 59, fire extinguishing sleeve and high-voltage bushing joint portion 49 are drawn in by 11 bottom structures of fire extinguishing sleeve and are directly laminated with high-voltage bushing 39 bottom basis mutually under initial condition, after high-voltage bushing 39 takes place the fire disaster, fire extinguishing sleeve and high-voltage bushing joint portion 49 can use the centre of a circle to expand outward automatically for the center and open, and the opening degree of oil gas escape orifice 57 and fire extinguishing sleeve and high-voltage bushing joint portion 49 expand outward and expand the degree directly proportional this moment, spout 58 and filler strip 59 are the auxiliary implement of fire extinguishing sleeve and high-voltage bushing joint portion 49 internal contraction and outside expansion.
Preferably, the fire extinguishing sleeve 11 is made of a non-combustible material, has a good flame retardant property and a good mechanical wear resistance effect, the inner wall of the fire extinguishing sleeve 11 is provided with a cooling water pipeline, the cooling water pipeline spirally surrounds the fire extinguishing sleeve 11 from top to bottom, and cooling water enters from the upper part of the cooling water pipeline and flows out from the lower part of the cooling water pipeline.
Preferably, the gas nozzle 50 is installed to be inclined toward the lower portion of the fire extinguishing sleeve 11.
Preferably, the exhaust layer 14 is a cylinder with a plurality of exhaust holes, the cross section of the cylinder is the same as the cross section of the fire extinguishing sleeve 11, and the exhaust holes on the exhaust layer 14 can be closed automatically or manually.
Preferably, the upper and lower surfaces of the exhaust layer 14 are open, the upper surface of the exhaust layer 14 is directly connected with the fire extinguishing sleeve 11 for receiving the oil-gas mixture discharged from the oil-gas discharge port 57 in the joint 49 of the fire extinguishing sleeve and the high-pressure casing, the lower surface of the exhaust layer 14 is directly connected with the oil-gas discharge layer 13, the oil-gas mixture is sequentially separated in the exhaust layer 14, and the gas mixture is discharged from the exhaust hole in the exhaust layer 14.
Preferably, the oil drainage layer 13 is a cylinder with a casing oil drainage port 17 at the bottom, the cross section of the cylinder is the same as that of the fire extinguishing sleeve 11, and the casing oil drainage port 17 is normally open.
Preferably, the upper surface of the oil discharge layer 13 is opened and directly connected with the exhaust layer 14, the lower surface of the oil discharge layer 13 is a closed surface with a casing oil discharge port 17, the upper surface of the oil discharge layer 13 is opened, the mixed oil separated from the exhaust layer 14 by the oil discharge layer 13 is collected for a short time and then is discharged into the lower oil gas storage bin 23 through the casing oil discharge port 17.
Preferably, the oil and gas storage bin 23 comprises a gas storage bin 21, an oil storage bin 24, an oil inlet 25 of the oil storage bin, an air inlet 27 of the oil storage bin, an exhaust valve 20, an inner oil outlet 28 of the oil storage bin and an outer oil outlet 29 of the oil storage bin, and the oil and gas storage bin 23 is of a cylindrical structure in appearance. The oil gas storage bin 23 is a temporary storage point for discharging the casing insulating oil, and if the insulating oil is combusted after being initially extinguished from the oil discharge layer 13, the insulating oil can enter the oil gas storage bin 23 to be extinguished again; the gas storage bin 21 is the upper half part of the oil and gas storage bin 23, and is filled with fire extinguishing gas with the same property as that in the fire extinguishing sleeve 11; the exhaust valve 20 is an automatic valve at the upper part of the gas storage bin 21, and when the gas pressure in the gas storage bin 21 reaches a limit value, the exhaust valve 21 can automatically open to exhaust gas; the oil storage bin 24 is the lower half part of the oil and gas storage bin 23, so that the insulating oil can stay for a period of time and extinguish fire under the action of fire extinguishing gas; the oil inlet 25 of the oil storage bin is the outlet of the lower oil drainage pipe 18 of the oil drainage layer 13; the oil storage bin air inlet 27 is an air inlet at the lower part of the oil storage bin 24, the oil storage bin air inlet 27 is positioned at the middle position of the bottom, the oil storage bin air inlet 27 is connected with an air inlet pipe of the oil storage bin 24, and fire extinguishing gas entering from the oil storage bin air inlet 27 is finally collected in the oil storage bin 21 to extinguish fire of insulating oil flame through insulating oil in the oil storage bin 24.
Preferably, the oil inlet 25 of the oil storage bin is located at three quarters of the lower part of the oil-gas storage bin 23, and the height of the oil inlet is higher than that of the oil outlet 28 in the oil storage bin so as to ensure that the insulating oil is discharged to an accident oil pool after the flame is completely extinguished.
Preferably, the oil storage chamber inner oil discharge port 28 and the oil storage chamber outer oil discharge port 29 form a communicated structure, and the highest point of the structure is the highest oil storage surface 22. When the height of the insulating oil in the oil storage bin 24 is larger than the height, the insulating oil barrel is automatically discharged through the communicating structure.
Preferably, the oil drain pipe 18 and the water drain pipe 63 are installed side by side, and both the oil drain pipe 18 and the water drain pipe 63 are attached to the high-pressure bushing elevating base 19 in a vertical plane.
The working principle of the invention is as follows: under normal conditions, piston rods of all levels of the hydraulic cylinder are stored in the cylinder barrel 8, the fire extinguishing sleeve 11 is folded and placed at the bottom of the high-voltage sleeve 39, and the fire extinguishing sleeve 11 is provided with a rainproof and dustproof sealing structure; when the high-voltage bushing 39 is on fire, the high, middle and low sides of the transformer trip out, and simultaneously two groups of fire detectors with different principles on the high-voltage bushing 39 act, a control unit of the device automatically starts, the hydraulic cylinder rises within 5 seconds, piston rods at all levels rise, and simultaneously the fire extinguishing sleeve 11 is driven to rise, and the fire extinguishing sleeve 11 forms a relatively closed space around the high-voltage bushing 39; when the fire extinguishing sleeve 11 is just lifted, the gas nozzles 50 start to spray the fire extinguishing gas which does not support combustion, the fire extinguishing gas is sprayed towards the high-pressure sleeve 39 and along the inner wall of the fire extinguishing sleeve 11, and the gas sprayed by the gas nozzles 50 fills the whole fire extinguishing sleeve 11 and continuously sprays the fire extinguishing gas after the fire extinguishing sleeve 11 is completely lifted; when the fire extinguishing sleeve 11 is just lifted, cooling water enters the fire extinguishing sleeve 11 through a water inlet in the upper part of the fire extinguishing sleeve 11, spirally flows downwards along the fire extinguishing sleeve 11, then flows out of the fire extinguishing sleeve 11 from a water outlet in the lower part of the fire extinguishing sleeve 11, and finally flows back to a fire pool; the cooling water circulation system is provided with a compressor, the cooling water can take away heat generated by a fire disaster of the high-voltage bushing 11, the high-voltage bushing 39 is helped to be rapidly cooled and put out a fire, meanwhile, the fire extinguishing sleeve 11 is protected, and the service life of the fire extinguishing sleeve 11 is prolonged; the sleeve and sleeve joint part 49 at the bottom of the fire extinguishing sleeve 11 is tightly combined under normal conditions, after a fire disaster occurs, the sleeve and sleeve joint part 49 can be automatically or manually opened, the oil gas discharge port 57 is gradually opened by closing at the moment, and the opening degree is controlled by a control unit or manually; the gas sprayed into the fire extinguishing sleeve 11 can wrap residual air in the fire extinguishing sleeve 11 or other combustible gas generated by combustion and enter the exhaust layer 14 at the lower part of the fire extinguishing sleeve 11 through the oil gas discharge port 57 until the fire extinguishing sleeve 11 is filled with the fire extinguishing gas, so that the flame of the high-pressure sleeve 39 is extinguished; the mixed gas entering the exhaust layer 14 can not be burnt generally, and if the mixed gas is burnt, the mixed gas can be directly sprayed and burnt from the exhaust holes 15 of the exhaust layer 14, so that the fire extinguishing effect of the device is not influenced; if the high-voltage bushing 39 has the problem of insulating oil leakage due to ignition, the insulating oil can directly pass through the oil gas discharge port 57 and the exhaust layer 14, finally flows into the oil discharge pipe through the bushing oil discharge port 17 by the collection of the oil discharge layer 13, and then flows into the oil gas storage bin 23; if the insulating oil flowing out of the fire-extinguishing sleeve 11 is still combusted, the fire-extinguishing gas sprayed from the oil-gas discharge port 57 by the fire-extinguishing sleeve 11 can extinguish fire for the first time when the insulating oil flows through the exhaust layer 14 and is collected in the oil discharge layer 13; if the insulating oil is continuously combusted and flows into the oil gas storage bin 23 at the moment, the gas storage bin 21 at the upper part of the oil gas storage bin 23 can extinguish the fire for the second time until the flame is extinguished; after the insulating oil is extinguished twice, the insulating oil is discharged to the emergency oil pool 43 through a communication structure consisting of the oil outlet 28 in the oil storage bin and the oil outlet 29 outside the oil storage bin.
Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (10)
1. The utility model provides an immersed extinguishing device of superhigh pressure transformer high-tension bushing which characterized in that: comprises a gas fire extinguishing unit, a cooling water circulating unit, a hydraulic cylinder power unit, an accident oil discharging unit and a control unit;
the gas fire extinguishing unit consists of a fire extinguishing gas inlet pipe, a fire extinguishing sleeve, a gas nozzle and a sleeve lower connecting body, wherein one end of the fire extinguishing gas inlet pipe is installed on the hydraulic cylinder power unit, the other end of the fire extinguishing gas inlet pipe is installed on the fire extinguishing sleeve, the sleeve lower connecting body is fixedly installed at the bottom of the high-pressure sleeve, the bottom of the sleeve lower connecting body is in contact with the bottom of the high-pressure sleeve, the contact part of the bottom of the sleeve lower connecting body and the bottom of the high-pressure sleeve is provided with an oil gas discharge port with adjustable size, the bottom of the fire extinguishing sleeve is fixedly installed on the sleeve lower connecting body, the fire extinguishing sleeve is foldable, the gas nozzle is installed on the inner side of the top end of the fire extinguishing sleeve, and the gas nozzle is provided with a plurality of gas nozzles;
the cooling water circulation unit consists of a cooling water inlet pipe, a water taking pipe and a water pump chamber, wherein one end of the cooling water inlet pipe is installed on the hydraulic cylinder power unit, the other end of the cooling water inlet pipe is installed on the fire extinguishing sleeve, one end of the water taking pipe is connected with the fire pool, the other end of the water taking pipe is connected with the water pump chamber, a water pump and a refrigeration compressor are installed in the water pump chamber, the water pipe is installed on the inner wall of the fire extinguishing sleeve, the water pipe is spirally arranged on the inner wall of the fire extinguishing sleeve from top to bottom, and a cooling water outlet is formed in the bottom of the fire extinguishing sleeve;
the hydraulic cylinder power unit comprises a cylinder barrel, a multi-stage piston rod, a cylinder barrel lacing wire and a cylinder barrel base, the cylinder barrel is a hydraulic cylinder barrel, the multi-stage piston rod comprises a first piston rod, a second piston rod, a third piston rod and a fourth piston rod, the second piston rod is arranged in the first piston rod, the third piston rod is arranged in the second piston rod, the fourth piston rod is arranged in the third piston rod, the cylinder barrel is fixedly arranged on the cylinder barrel base, and the cylinder barrel lacing wire is arranged between the cylinder barrel and the cylinder barrel base;
the oil discharge unit for the accident comprises an oil discharge layer, a sleeve oil discharge port, an oil discharge pipe, an exhaust valve, an oil gas storage bin, an oil storage bin and an oil discharge port outside the oil storage bin, wherein the oil discharge layer is positioned below an exhaust layer, the upper part of the oil discharge layer is open, the lower part of the oil discharge layer is sealed, the bottom of the oil discharge layer is provided with the sleeve oil discharge port, the upper end of the oil discharge pipe is connected with the sleeve oil discharge port, the lower end of the oil discharge pipe is arranged in the oil gas storage bin, the upper part of the oil gas storage bin is a gas storage bin, the exhaust valve is arranged on a gas outlet at the top end of the gas storage bin, the lower part of the oil gas storage bin is the oil storage bin, the left side of the oil storage bin is provided with an oil storage bin oil inlet and the height of the oil storage bin is lower than the central line of the oil gas storage bin, an air inlet pipe of the oil storage bin is positioned at the middle position of the lower part of the oil storage bin, and the oil discharge port is positioned at the lower part of the oil storage bin, the height of the oil outlet outside the oil storage bin is consistent with that of the oil outlet inside the oil storage bin, and the oil outlet outside the oil storage bin is connected with the emergency oil pool through a pipeline;
the control unit consists of a console, an on-site control chamber, an air storage chamber and a water pump chamber, wherein the on-site control chamber is connected with the console, the air storage chamber and the water pump chamber are both connected with the console, and the console is connected with the hydraulic power unit.
2. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 1, wherein: the gas sprayed by the gas spray heads in the gas fire extinguishing unit has two directions, one direction faces the high-voltage bushing and slightly inclines downwards for a certain angle, the other direction is along the inner wall of the fire extinguishing sleeve and slightly inclines downwards for a certain angle, the gas sprayed by the two adjacent gas spray heads are mutually interwoven, and the gas tracks of the two adjacent gas spray heads form a net-shaped structure in space.
3. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 1, wherein: the hydraulic cylinder power unit is provided with a fire extinguishing gas pipeline and a cooling water pipeline, the fire extinguishing gas pipeline is mainly divided into two paths, the fire extinguishing gas pipeline enters from the bottom of the cylinder barrel, rises along the center of the hydraulic cylinder, enters the fire extinguishing gas inlet pipe after reaching the top of the fourth piston rod, and is sprayed by the gas spray head; the other path of fire extinguishing gas pipeline is led out from the cylinder barrel base, laid along the ground, enters an air inlet pipe of the oil storage bin and then enters the oil storage bin; the cooling water pipeline enters from the bottom of the cylinder barrel, rises along the center of the hydraulic cylinder, enters the cooling water inlet pipe after reaching the top of the fourth piston rod, and cooling water in the water inlet pipe enters the internal circulation of the fire extinguishing sleeve through the water inlet of the fire extinguishing sleeve, and finally returns to the fire pool through the water outlet of the fire extinguishing sleeve and the water discharge pipe after circulation.
4. An immersed fire extinguishing apparatus for a high voltage bushing of an ultra high voltage transformer as claimed in claim 1, wherein: when the fire extinguishing sleeve is folded, the upper part of the fire extinguishing sleeve is provided with a rainproof and dustproof sealing measure, and the fire extinguishing sleeve is automatically pushed open when rising; the fire extinguishing sleeve can be lifted along with the lifting of the hydraulic cylinder, and a relatively closed cylindrical space is formed around the high-pressure sleeve.
5. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 1, wherein: connector includes sleeve and high-voltage bushing joint position, oil gas escape orifice, spout and filler strip of putting out a fire under the sleeve, put out a fire sleeve and high-voltage bushing joint position under initial condition, draw in by sleeve bottom structure of putting out a fire and directly laminate mutually with high-voltage bushing bottom basis, behind the high-voltage bushing takes place the fire disaster, sleeve and high-voltage bushing joint position of putting out a fire can use the centre of a circle to expand outward automatically and open as the center, and the opening degree of oil gas escape orifice is directly proportional with sleeve and the high-voltage bushing joint position degree of expanding outward this moment, spout and filler strip are the supplementary utensil of sleeve and high-voltage bushing joint position of putting out a fire inwards shrink and outward expansion.
6. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 1, wherein: the fire extinguishing sleeve is made of non-combustible materials, has good flame retardant property and good mechanical wear resistant effect, a cooling water pipeline is installed in the inner wall of the fire extinguishing sleeve, the cooling water pipeline surrounds the fire extinguishing sleeve in a spiral mode from top to bottom, and cooling water enters from the upper portion of the cooling water pipeline and flows out from the lower portion of the cooling water pipeline.
7. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 1, wherein: the gas nozzle is inclined towards the lower part of the fire extinguishing sleeve in the installation mode.
8. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 1, wherein: the exhaust layer is a cylinder with a plurality of exhaust holes, the section of the cylinder is consistent with that of the fire extinguishing sleeve, and the exhaust holes in the exhaust layer can be closed automatically or manually.
9. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 8, wherein: the upper surface and the lower surface of the exhaust layer are provided with openings, the upper surface of the exhaust layer is directly connected with the fire extinguishing sleeve and is used for bearing oil-gas mixtures discharged from an oil-gas discharge port in the joint of the fire extinguishing sleeve and the high-voltage sleeve, the lower surface of the exhaust layer is directly connected with an oil discharge layer, the oil-gas mixtures are sequentially separated in the exhaust layer, and the gas mixtures are discharged from exhaust holes in the exhaust layer.
10. An ultra high voltage transformer high voltage bushing immersion type fire extinguishing apparatus as claimed in claim 1, wherein: the oil drainage layer is a cylinder with a casing oil drainage port at the bottom, the section of the cylinder is consistent with that of the fire extinguishing sleeve, and the casing oil drainage port is normally open;
the upper surface of the oil discharge layer is provided with an opening, the upper surface of the oil discharge layer is directly connected with an exhaust layer, a closed surface with a casing oil discharge port is arranged below the oil discharge layer, the upper surface of the oil discharge layer is provided with an opening, and the oil discharge layer collects the mixed oil separated by the exhaust layer for a short time and then discharges the mixed oil into a lower oil gas storage bin through the casing oil discharge port;
the oil gas storage bin comprises a gas storage bin, an oil inlet of the oil storage bin, an air inlet of the oil storage bin, an exhaust valve, an inner oil outlet of the oil storage bin and an outer oil outlet of the oil storage bin, and the oil gas storage bin is in a cylindrical structure;
the oil inlet of the oil storage bin is positioned at three quarters of the lower part of the oil-gas storage bin, and the height of the oil inlet is higher than that of the oil outlet in the oil storage bin so as to ensure that the insulating oil is discharged to an accident oil pool after the flame is completely extinguished;
the oil outlet inside the oil storage bin and the oil outlet outside the oil storage bin form a communicated structure, and the highest point of the structure is the highest oil storage surface;
the oil discharge pipe and the drain pipe are arranged side by side, and the oil discharge pipe and the drain pipe are attached to the high-voltage sleeve lifting seat on the vertical surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210667269.XA CN115040808B (en) | 2022-06-13 | 2022-06-13 | Immersed fire extinguishing device for high-voltage bushing of ultra-high voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210667269.XA CN115040808B (en) | 2022-06-13 | 2022-06-13 | Immersed fire extinguishing device for high-voltage bushing of ultra-high voltage transformer |
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