CN111326987B - High-voltage cable trench safety protection method - Google Patents
High-voltage cable trench safety protection method Download PDFInfo
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- CN111326987B CN111326987B CN202010282819.7A CN202010282819A CN111326987B CN 111326987 B CN111326987 B CN 111326987B CN 202010282819 A CN202010282819 A CN 202010282819A CN 111326987 B CN111326987 B CN 111326987B
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- fire extinguishing
- cable trench
- inspection device
- cable
- plate
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007689 inspection Methods 0.000 claims abstract description 69
- 244000035744 Hura crepitans Species 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims description 39
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 239000004576 sand Substances 0.000 claims description 16
- 230000000903 blocking effect Effects 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 15
- 239000012943 hotmelt Substances 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
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- 239000000523 sample Substances 0.000 claims description 3
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- 230000000630 rising effect Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 238000007599 discharging Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
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Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
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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
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/02—Permanently-installed equipment with containers for delivering the extinguishing substance
- A62C35/04—Swingable or tiltable containers
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/02—Permanently-installed equipment with containers for delivering the extinguishing substance
- A62C35/11—Permanently-installed equipment with containers for delivering the extinguishing substance controlled by a signal from the danger zone
- A62C35/13—Permanently-installed equipment with containers for delivering the extinguishing substance controlled by a signal from the danger zone with a finite supply of extinguishing material
-
- 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
- A62C37/46—Construction of the actuator
- A62C37/48—Thermally sensitive initiators
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0018—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using gases or vapours that do not support combustion, e.g. steam, carbon dioxide
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0018—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using gases or vapours that do not support combustion, e.g. steam, carbon dioxide
- A62C99/0027—Carbon dioxide extinguishers
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0045—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using solid substances, e.g. sand, ashes; using substances forming a crust
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/228—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for covered wires or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
Abstract
The invention relates to a safety protection method for a high-voltage cable trench, which is based on a high-temperature fire extinguishing device for the high-voltage cable trench. The guide rail system including be fixed in left guide rail and the right guide rail on the cable pit left and right sides lateral wall respectively, inspection device slide and set up between left guide rail and right guide rail. The inspection device is internally provided with a fire extinguishing device, and fire extinguishing operation can be performed on the fire source of the cable trench. The invention can monitor the temperature in the cable trench in real time, and the cable can automatically extinguish fire in time through the sandbox and the inspection device after being ignited.
Description
Technical Field
The invention belongs to the technical field of electric power facility safety protection, and particularly relates to a high-voltage cable trench safety protection method.
Background
A cable is generally a rope-like cable made up of several or groups of conductors (at least two in each group) twisted together, each group of conductors being insulated from each other and often twisted around a center, the entire outer surface being covered with a highly insulating covering, the cable being an important component of the power transmission and distribution link. In power transmission and distribution processes of cities, factories, communities and the like, cables are usually placed inside cable ducts. The cable trench is usually dug and built on the ground downwards according to the design requirement, a bearing angle steel frame is welded on the side wall of the trench and grounded according to the requirement, and a cover plate covers the side wall of the trench. The inside relative seal of cable pit, air fluidity is not good, can generate heat in the cable use simultaneously, and the inside heat of cable pit can't in time distribute away, if meetting naked light or other reasons, the cable probably can catch fire. Meanwhile, the fire in the cable trench is hidden, and cannot be found in time, so that greater economic loss can be caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention overcomes the defects of the prior art and provides a safety protection method for a high-voltage cable trench.
The technical scheme adopted by the invention for solving the problems in the prior art is as follows:
a high-voltage cable trench safety protection method is based on a high-voltage cable trench high-temperature fire extinguishing device which comprises a guide rail system and an inspection device.
The guide rail system including being fixed in left guide rail and the right guide rail on the cable pit left and right sides lateral wall respectively, equal indent has the slide on the terminal surface that both are relative, left guide rail below equipartition has the first temperature sensor of a plurality of and has the charging panel of the interface that charges.
The inspection device is arranged between the left guide rail and the right guide rail in a sliding mode and is located above the cable.
The inspection device is internally provided with at least two motors with double output shafts, the output shafts of the motors with the double output shafts drive driving wheels arranged on the motors to rotate, and the driving wheels are arranged inside the slide way in a sliding manner.
The inspection device is internally provided with a charging head, a power supply device, an electric control board and a first electric telescopic device, the charging head can charge for the power supply device, and the first electric telescopic device controls the charging head to enter and exit the inspection device.
The inspection device inside be equipped with extinguishing device, extinguishing device including the case that extinguishes fire, the control tube, the fire extinguishing agent discharge pipe, the control lever, the electronic telescoping device of second, the control tube is fixed in on the case outer wall that extinguishes fire, be equipped with the seal membrane between case and the control tube of putting out fire, take over through-connection through middle between control tube and the fire extinguishing agent discharge pipe, the fire extinguishing agent discharge pipe is located the outside below of case that extinguishes fire, be equipped with a plurality of fire extinguishing agent jet orifice on the fire extinguishing agent discharge pipe, the control lever slides from side to side in the control tube inside, the control lever is equipped with closing plate and needle tubing towards the one end of seal membrane in proper order, be equipped with the perforating hole on the needle tubing periphery, the opening that middle takeover is located on the control tube is located between.
The first temperature sensor, the first electric telescopic device, the double-output-shaft motor, the power supply device and the second electric telescopic device are respectively electrically connected with the electric control board.
Guide rail system top be equipped with two sand box bracing pieces, two sand box bracing pieces respectively with two lateral wall fixed connection of cable pit, two sand box bracing piece tops are supported there is the sand box, the sand box is inside to be equipped with the sand of putting out a fire, the bottom plate one end of sand box can be around the pivot upset downwards, pass through hot melt piece fixed connection between the other end of bottom plate and the sand box bracing piece.
When the temperature in the cable duct is higher than the melting point of the middle part of the hot melt sheet, the hot melt sheet is broken, the bottom plate is turned downwards, the fire extinguishing sand in the sand box is inclined downwards, and the fire extinguishing sand covers the fire point to extinguish fire.
Preferably, the inside below of right guide rail be equipped with main air duct, main air duct through the exhaust hole of slope arrangement with the inside through connection of cable pit, the inside thermal bulb that is equipped with in exhaust hole, the thermal bulb is fixed inside the exhaust hole through foraminiferous thermal bulb mount, the thermal bulb pars contractilis passes through the activity of connecting rod control closure plate, is equipped with the baffle between closure plate and the thermal bulb, is equipped with the air vent in the middle of the baffle, the air vent in the middle of the baffle is sealed with the closure plate.
The gas filled in the main air passage is carbon dioxide or nitrogen, and the main air passage is provided with a flow sensor.
The safety protection method for the high-voltage cable trench comprises the following steps:
A. when the local temperature in the cable trench rises, the temperature bulb at the position thermally expands, the connecting rod pushes the blocking plate to move, the blocking plate removes the sealing of the middle hole of the partition plate, the gas in the main air duct flows into the cable trench through the middle hole of the partition plate to drive the air in the cable trench to flow and reduce the local temperature, and meanwhile, the gas in the main air duct does not contain oxygen, so the oxygen content of the temperature rising part of the cable trench can be reduced by the flowing gas, and the ignition is further avoided;
B. when a cable in the cable trench catches fire, the local temperature rises, the middle part of the hot melt sheet begins to soften, the strength is reduced, the hot melt sheet is broken under the gravity action of fire extinguishing sand in the sand box, the bottom plate turns downwards, the fire extinguishing sand in the sand box falls down to cover the fire point of the cable, and the flame is extinguished;
C. the first temperature sensor detects the local temperature rise of the cable trench, and transmits a signal to the cable trench control center, the control center automatically sends an instruction to the inspection device, the electric control board controls the double-output-shaft motor to be started, and the double-output-shaft motor controls the driving wheel to rotate to drive the inspection device to move to a corresponding position;
D. when the inspection device moves, the camera and the searchlight are started, and the screen of the control center of the cable trench management enterprise can display the content shot by the camera;
E. when the inspection device moves to a specified position, the second temperature sensor can detect the temperature of the cable below the inspection device again, whether fire light exists or not can be detected through the photosensitive sensor, when the fire light exists, the electric control board controls the second electric telescopic device to start, the second electric telescopic device controls the control rod to move towards the direction of the sealing membrane, the needle tube punctures the sealing membrane, the fire extinguishing agent in the fire extinguishing box is discharged into the control tube through the through hole in the needle tube and then is sprayed out through the fire extinguishing agent spraying hole to extinguish the fire;
F. the inspection device can be used for daily inspection, the temperature of the surface of the cable is detected through the second temperature sensor, data are transmitted to a control center of a management company in real time or at intervals, and management personnel can pre-judge in advance through the temperature of the cable and make corresponding treatment conveniently.
Preferably, the control pipe is internally provided with a sealing boss, the sealing boss is arranged between an opening of the middle connecting pipe on the control pipe and the sealing plate, and the inner diameter of the sealing boss is smaller than the outer diameter of the sealing plate.
Preferably, the inspection device is internally provided with a short-circuit device, the short-circuit device comprises a plurality of electromagnets which are arranged in parallel, and the electromagnets are fixedly connected with the bottom surface of the inspection device.
The middle shaft penetrates through the middle of the electromagnet, the lower end of the middle shaft penetrates through the lower portion of the outer portion of the inspection device, the conical needle head with the inverted shape is arranged at the lower end of the middle shaft, and the needle head is located right above the cable.
The jackshaft upper end is equipped with spring roof, is equipped with thrust spring between spring roof and the electro-magnet, and spring roof upper end is equipped with and leads electrical pillar.
The cover is equipped with the current conducting plate on leading electrical pillar, and current conducting plate one end is worn to establish to the inspection device outside, and the current conducting plate is worn to establish to the outside one end of inspection device and cable pit lateral wall electric conduction contact.
Preferably, when the cable is detected to be on fire, the electric control plate controls the electromagnet to be electrified, the electromagnet adsorbs the spring top plate, the middle shaft moves downwards, the needle head punctures the cable sheath below the middle shaft, then the cable is quickly grounded through the conductive plate, the grounding protection of the cable is started, and the accident is prevented from further expanding;
preferably, the conducting plate is worn to establish to the outside one end of inspection device and is equipped with the electrically conductive gyro wheel that can free rotation, electrically conductive gyro wheel and the contact of cable pit lateral wall.
Preferably, the inspection device include upper end case and lower end case of arranging from top to bottom, dual output shaft motor and power supply unit set up in the upper end incasement portion, first electronic telescoping device, short-circuit device, extinguishing device, automatically controlled board set up in the lower end incasement portion.
Preferably, two cameras are respectively arranged on the front end face and the rear end face of the lower end box, and searchlights are arranged around the cameras. The bottom surface of the lower end box is provided with a plurality of second temperature sensors and photosensitive sensors, and probes of the second temperature sensors are opposite to cables right below the second temperature sensors. The camera, the searchlight, the second temperature sensor and the photosensitive sensor are respectively electrically connected with the electric control board.
Preferably, the electric control board is integrated with an industrial control chip, a wireless signal transmission module, a wireless signal receiving module and a Beidou positioning module.
Compared with the prior art, the invention has the following beneficial effects:
(1) the temperature detection points are arranged at intervals of the cable trench, so that the temperature of each part of the cable trench can be monitored in real time, and the temperature abnormity can be found in time.
(2) The temperature rise caused by local fire can fuse the hot melt sheet of the sand box above the local fire, and sand in the sand box covers the fire point to extinguish the fire.
(3) When the local temperature of the cable duct is too high, the exhaust holes of the nearby main air duct can spray carbon dioxide or nitrogen outwards to dilute the oxygen concentration of the area and avoid fire.
(4) The inspection device can automatically inspect, charge and extinguish fire, and transmits the current image to the control center.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a layout view of a high-temperature fire extinguishing apparatus for a high-voltage cable raceway of the present invention,
figure 2 is a view of the internal layout of a cable trench according to the invention,
figure 3 is a diagram of the explosion effect of the various components of the present invention,
figure 4 is a schematic view of the sand box bottom plate of the invention after being turned and opened,
fig. 5 is a view showing an internal structure of the inspection equipment according to the present invention,
figure 6 is an outline view of the fire extinguishing apparatus of the present invention,
figure 7 is a plan sectional view of the short-circuiting device according to the invention,
figure 8 is a plan sectional view of the fire extinguishing apparatus of the present invention,
figure 9 is a plan sectional view of the drive wheel of the present invention,
figure 10 is a front view in plan section of the drive wheel of the present invention,
figure 11 is a plan cross-sectional view of a cable trench according to the present invention,
FIG. 12 is an enlarged view of a portion of the present invention at A,
FIG. 13 is an enlarged view of a portion of the present invention B,
FIG. 14 is an enlarged view of a portion of the present invention at C.
In the figure: 1-sand box, 101-bottom plate, 102-rotating shaft;
2-sand box supporting rod, 201-hot melt piece;
3-guide rail system, 301-left guide rail, 3011-charging plate, 3012-charging interface, 3013-first temperature sensor, 302-right guide rail, 3021-main air passage, 3022-exhaust hole, 3023-bulb, 3024-bulb holder, 3025-connecting rod, 3026-block plate, 3027-partition plate, 303-slide;
4-a routing inspection device, 401-an upper end box, 402-a lower end box, 4021-a camera and 4022-a searchlight;
5-a first electric telescopic device, 501-a charging head;
6-double output shaft motor, 601-driving wheel;
7-a power supply device;
8-short circuit device, 801-electromagnet, 802-intermediate shaft, 803-needle, 804-spring top plate, 805-conductive column, 806-thrust spring;
9-a fire extinguishing device, 901-a fire extinguishing box, 9011-a sealing film, 902-a control pipe, 9021-a sealing boss, 903-a fire extinguishing agent discharging pipe, 9031-a fire extinguishing agent spraying hole, 904-a middle connecting pipe, 905-a control rod, 9051-a sealing plate, 9052-a needle tube, 90521-a through hole and 906-a second electric telescopic device;
10-conductive plate, 1001-conductive roller;
11-an electric control board, 12-a second temperature sensor, 13-a photosensitive sensor, 14-a cable, 15-a cable bracket and 16-a cable trench.
Detailed Description
The attached drawings are preferred embodiments of the high-voltage cable trench safety protection method, and the invention is further described in detail with reference to the attached drawings.
A high-voltage cable trench safety protection method is based on a high-voltage cable trench high-temperature fire extinguishing device. As shown in fig. 1, fig. 2, fig. 3 and fig. 5, the high-temperature fire extinguishing device for the high-voltage cable trench comprises a guide rail system 3 and an inspection device 4.
As shown in fig. 11, the guide rail system 3 includes a left guide rail 301 and a right guide rail 302 fixed on the left and right side walls of the cable trench 16, respectively, and the opposite end surfaces of the left and right guide rails are both recessed with a slide way 303.
A plurality of first temperature sensors 3013 (shown in fig. 14) and a charging board 3011 with a charging interface 3012 are uniformly distributed below the left rail 302.
A main air passage 3021 is provided below the right rail 302, and the main air passage 3021 is connected to the inside of the cable duct 16 through an exhaust hole 3022 arranged obliquely. As shown in the attached figure 13, a thermal bulb 3023 is arranged inside the exhaust hole 3022, and the thermal bulb 3023 is fixed inside the exhaust hole 3022 through a thermal bulb fixing frame 3024 with a hole. The flexible part of the thermal bulb 3023 controls the movement of the blocking plate 3026 through the connecting rod 3025, a partition 3027 is arranged between the blocking plate 3026 and the thermal bulb 3023, a vent hole is arranged in the middle of the partition 3027, the blocking plate 3026 seals the vent hole in the middle of the partition 3027, and a sealing rubber gasket is fixed on the end surface of the blocking plate 3026 facing the partition 3027 in order to improve the sealing performance of the blocking plate 3026.
The gas filled in the main duct 3021 is carbon dioxide or nitrogen, and when discharged into the cable trench 16, the gas can dilute the local oxygen concentration, reduce the possibility of fire, or assist in extinguishing fire after fire occurs. The main duct 3021 is provided with a flow sensor which detects the flow of gas in the main duct 3021 when a vent hole in the middle of the partition plate 3027 is opened by one of the blocking plates 3026 and the gas in the main duct 3021 flows into the cable trench 16.
As shown in fig. 9, the internal portion of the upper end box 401 of the inspection device 4 is provided with at least two motors 6 with double output shafts, the output shafts of the motors 6 with double output shafts drive the driving wheels 601 arranged on the motors to rotate, and the driving wheels 601 are arranged inside the slide ways 303 in a sliding manner.
As shown in fig. 8 and 10, the inspection device 4 is internally provided with a charging head 501, a power supply device 7, an electric control board 11 and a first electric telescopic device 5, the charging head 501 can be charged by the power supply device 7, and the first electric telescopic device 5 controls the charging head 501 to enter and exit the inspection device 4.
As shown in fig. 6, 8 and 12, a fire extinguishing apparatus 9 is arranged inside the lower end box 402 of the inspection apparatus 4, the fire extinguishing apparatus 9 includes a fire extinguishing box 901, a control pipe 902, a fire extinguishing agent discharge pipe 903, a control rod 905 and a second electric telescopic apparatus 906, and a high-pressure fire extinguishing agent is filled inside the fire extinguishing box 901. The control pipe 902 is fixed on the outer wall of the fire extinguishing box 901, a sealing film 9011 is arranged between the fire extinguishing box 901 and the control pipe 902, and the control pipe 902 is communicated with the fire extinguishing agent discharging pipe 903 through a middle connecting pipe 904. The fire extinguishing agent discharging pipe 903 is located below the outside of the fire extinguishing box 901, and a plurality of fire extinguishing agent spraying holes 9031 are formed in the fire extinguishing agent discharging pipe 903. The control rod 905 slides in the control tube 902 from left to right, a sealing plate 9051 and a needle tube 9052 are sequentially arranged at one end of the control rod 905 facing the sealing film 902, and a through hole 90521 is arranged on the circumferential surface of the needle tube 9052. The opening of the middle connecting pipe 904 on the control pipe 902 is always positioned between the sealing film 9011 and the sealing plate 9051, and the second electric telescopic device 906 controls the control rod 905 to slide left and right.
The inside of the control tube 902 is provided with a sealing boss 9021, the sealing boss 9021 is arranged between the opening of the middle connecting tube 904 on the control tube 902 and the sealing plate 9051, and the inner diameter of the sealing boss 9021 is smaller than the outer diameter of the sealing plate 9051.
As shown in fig. 7, the inspection device 4 is internally provided with a short-circuit device 8, the short-circuit device 8 comprises a plurality of electromagnets 801 arranged in parallel, and the electromagnets 801 are fixedly connected with the bottom surface of the inspection device 4.
An intermediate shaft 802 penetrates through the middle of the electromagnet 801, the lower end of the intermediate shaft 802 penetrates below the outer portion of the inspection device 4, a conical needle 803 with an inverted shape is arranged at the lower end of the intermediate shaft 802, and the needle 803 is located right above the cable 14.
The upper end of the intermediate shaft 802 is provided with a spring top plate 804, a thrust spring 806 is arranged between the spring top plate 804 and the electromagnet 801, and the upper end of the spring top plate 804 is provided with a conductive column 805.
The conductive column 805 is sleeved with a conductive plate 10, one end of the conductive plate 10 penetrates through the inspection device 4, and the conductive plate 10 penetrates through the inspection device 4 and electrically conducts with the side wall of the cable trench 16 to make contact, namely the conductive plate 10 is grounded through the side wall of the cable trench 16. The conductive plate 10 is provided with a freely rotatable conductive roller 1001 at one end penetrating the inspection device 4, and the conductive roller 1001 is in contact with the sidewall of the cable trench 16.
The double-output-shaft motor 6 and the power supply device 7 are arranged inside the upper end box 401, and the first electric telescopic device 5, the short-circuit device 8, the fire extinguishing device 9 and the electric control board 11 are arranged inside the lower end box 402.
Two front and back end faces of the lower end box 402 are respectively provided with a camera 4021, a searchlight 4022 is arranged around the camera 4021, the searchlight 4022 provides a light source, and the camera 4012 shoots image data in the cable trench 16 and transmits the image data to a control center.
The bottom surface of the lower end box 402 is provided with a plurality of second temperature sensors 12 and a photosensitive sensor 13, the probes of the second temperature sensors 12 are opposite to the cables 14 right below the second temperature sensors, in the inspection process of the inspection device 4, the second temperature sensors 12 measure the temperature of the cables below the second temperature sensors, temperature abnormity can be found in time, for example, the same cable, and the temperature of a certain section is higher than that of other parts.
The first temperature sensor 3013, the camera 4021, the searchlight 4022, the first electric telescopic device 5, the double-output-shaft motor 6, the power supply device 7, the second electric telescopic device 906, the second temperature sensor 12 and the photosensitive sensor 13 are electrically connected with the electric control board 11 respectively. The electronic control board 11 is integrated with an industrial control chip, a wireless signal transmission module, a wireless signal receiving module and a Beidou positioning module.
3 tops of guide rail system be equipped with two sand box bracing pieces 2, two sand box bracing pieces 2 respectively with 16 two lateral walls fixed connection of cable pit, two sand box bracing pieces 2 tops are supported there is sand box 1, sand box 1 is inside to be equipped with the sand of putting out a fire. One end of the bottom plate 101 of the sand box 1 can be turned downwards around the rotating shaft 102, and the other end of the bottom plate 101 is fixedly connected with the sand box supporting rod 2 through the hot melt sheet 201.
When the temperature inside the cable trench 16 is higher than the melting point of the middle part of the thermal fuse sheet 201, the thermal fuse sheet 201 is broken, the bottom plate 101 is turned downwards (shown in fig. 4), and the fire extinguishing sand inside the sand box 1 is inclined downwards to cover the fire point for fire extinguishing.
A high-voltage cable trench automatic fire extinguishing method comprises the following steps:
A. when the local temperature in the cable trench 16 rises, the bulb 3023 therein is heated, the connecting rod 3026 pushes the blocking plate 3025 to move, the blocking plate 3025 releases the sealing of the middle hole of the partition board 3027, the gas in the main air duct 2021 flows into the cable trench 16 through the middle hole of the partition board 3027, and drives the air in the cable trench 16 to flow, so as to reduce the local temperature, and meanwhile, because the gas in the main air duct 2021 does not contain oxygen, the oxygen content in the temperature-rising part of the cable trench 16 can be reduced by the flowing gas, so as to further avoid ignition;
B. when the cable 14 in the cable trench 16 is on fire, the local temperature rises, the middle part of the hot melt sheet 201 starts to be softened, the strength is reduced, the hot melt sheet 201 is broken under the action of the gravity of the fire extinguishing sand in the sand box 1, the bottom plate 101 turns downwards, the fire extinguishing sand in the sand box 1 falls down to cover the fire ignition point of the cable 14, and the flame is extinguished;
C. the first temperature sensor 3013 detects that the local temperature of the cable trench 16 rises, and transmits a signal to the control center, the control center automatically sends an instruction to the inspection device 4, the electric control board 11 controls the dual-output-shaft motor 6 to be started, and the dual-output-shaft motor 6 controls the driving wheel 601 to rotate to drive the inspection device 4 to move to a corresponding position;
D. when the inspection device 4 moves, the camera 4021 and the searchlight 4022 are started, and the screen of the control center of the cable pit 16 management enterprise can display the content shot by the camera 4021;
E. when the inspection device 4 moves to a specified position, the second temperature sensor 12 can detect the temperature of the cable 14 below the second temperature sensor again, whether fire is present or not can be detected through the photosensitive sensor 13, when the fire is present, the electric control board 11 controls the second electric telescopic device 906 to be started, the second electric telescopic device 906 controls the control rod 905 to move towards the sealing film 9011, the sealing film 9011 is pierced by the needle tube 9052, the fire extinguishing agent in the fire extinguishing box 901 is discharged into the control tube 902 through the through hole 90521 in the needle tube 9052 and then is sprayed out through the fire extinguishing agent spraying hole 9031 to extinguish the fire;
F. when the cable 4 is detected to be on fire, the electric control board 11 controls the electromagnet 801 to be electrified, the electromagnet 801 adsorbs the spring top board 804, the middle shaft 802 moves downwards, the needle 803 punctures the sheath of the cable 14 below the middle shaft, then the cable 14 is quickly grounded through the electric conduction board 10, the grounding protection of the cable 14 is started, and the accident is prevented from further expanding;
G. the inspection device 4 can perform daily inspection, detect the temperature on the surface of the cable 14 through the second temperature sensor 12, and transmit data to a control center of a management company in real time or at intervals, so that managers can conveniently predict in advance through the temperature of the cable 14 and make corresponding treatment.
The embodiments of the present invention have been described in detail with reference to the drawings, but 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 gist of the present invention.
Claims (8)
1. A high-voltage cable trench safety protection method is characterized in that:
the high-voltage cable trench safety protection method is based on a high-voltage cable trench high-temperature fire extinguishing device which comprises a guide rail system (3) and a routing inspection device (4),
the guide rail system (3) comprises a left guide rail (301) and a right guide rail (302) which are respectively fixed on the side walls of the left side and the right side of the cable trench (16), slide rails (303) are respectively arranged on the opposite end surfaces of the left guide rail and the right guide rail in a concave manner, a plurality of first temperature sensors (3013) and charging plates (3011) with charging interfaces (3012) are uniformly distributed below the left guide rail (302),
the inspection device (4) is arranged between the left guide rail (301) and the right guide rail (302) in a sliding manner, the inspection device (4) is positioned above the cable (14),
the inspection device (4) is internally provided with at least two motors (6) with double output shafts, the output shafts of the motors (6) with double output shafts drive driving wheels (601) arranged on the motors to rotate, the driving wheels (601) are arranged inside the slide ways (303) in a sliding way,
the inspection device (4) is internally provided with a charging head (501), a power supply device (7), an electric control board (11) and a first electric telescopic device (5), the charging head (501) can charge the power supply device (7), the first electric telescopic device (5) controls the charging head (501) to come in and go out of the inspection device (4),
the inspection device (4) is internally provided with a fire extinguishing device (9), the fire extinguishing device (9) comprises a fire extinguishing box (901), a control pipe (902), a fire extinguishing agent discharge pipe (903), a control rod (905) and a second electric telescopic device (906), the control pipe (902) is fixed on the outer wall of the fire extinguishing box (901), a sealing film (9011) is arranged between the fire extinguishing box (901) and the control pipe (902), the control pipe (902) and the fire extinguishing agent discharge pipe (903) are connected through a middle connecting pipe (904), the fire extinguishing agent discharge pipe (903) is positioned below the outer part of the fire extinguishing box (901), the fire extinguishing agent discharge pipe (903) is provided with a plurality of fire extinguishing agent injection holes (9031), the control rod (905) slides left and right inside the control pipe (902), one end of the control rod (905) facing the sealing film (902) is sequentially provided with a sealing plate (9051) and a needle tube (9052), the circumferential surface of the needle tube (9052) is provided with a through, the opening of the middle connecting pipe (904) on the control pipe (902) is always positioned between the sealing film (9011) and the sealing plate (9051), the second electric telescopic device (906) controls the control rod (905) to slide left and right,
the first temperature sensor (3013), the first electric telescopic device (5), the double-output-shaft motor (6), the power supply device (7) and the second electric telescopic device (906) are respectively electrically connected with the electric control board (11),
two sand box supporting rods (2) are arranged above the guide rail system (3), the two sand box supporting rods (2) are respectively and fixedly connected with two side walls of the cable trench (16), a sand box (1) is supported above the two sand box supporting rods (2), fire extinguishing sand is filled in the sand box (1), one end of a bottom plate (101) of the sand box (1) can be downwards overturned around a rotating shaft (102), the other end of the bottom plate (101) is fixedly connected with the sand box supporting rods (2) through a hot melt sheet (201),
when the temperature in the cable trench (16) is higher than the melting point of the middle part of the hot melt sheet (201), the hot melt sheet (201) is broken, the bottom plate (101) is turned downwards, the fire extinguishing sand in the sand box (1) is inclined downwards to cover an ignition point for extinguishing fire,
a main air passage (3021) is arranged below the inside of the right guide rail (302), the main air passage (3021) is communicated with the inside of the cable trench (16) through an exhaust hole (3022) which is obliquely arranged, a thermal bulb (3023) is arranged inside the exhaust hole (3022), the thermal bulb (3023) is fixed inside the exhaust hole (3022) through a perforated thermal bulb fixing frame (3024), the expansion part of the thermal bulb (3023) controls the movement of a blocking plate (3026) through a connecting rod (3025), a partition plate (3027) is arranged between the blocking plate (3026) and the thermal bulb (3023), a vent hole is arranged in the middle of the partition plate (3027), and the vent hole in the middle of the partition plate (3027) is sealed by the blocking plate (3026),
the gas filled in the main air passage (3021) is carbon dioxide or nitrogen, a flow sensor is arranged on the main air passage (3021),
the safety protection method for the high-voltage cable trench comprises the following steps:
A. when the local temperature in the cable trench (16) rises, the thermal bulb (3023) at the position is heated, the connecting rod (3026) pushes the blocking plate (3025) to move, the blocking plate (3025) releases the sealing of the middle hole of the partition plate (3027), the gas in the main air passage (2021) flows into the cable trench (16) through the middle hole of the partition plate (3027), and drives the air in the cable trench (16) to flow, so that the local temperature is reduced, and meanwhile, because the gas in the main air passage (2021) does not contain oxygen, the oxygen content of the temperature rising part of the cable trench (16) can be reduced by the flowing gas, so that the fire is further avoided;
B. when a cable (14) in the cable trench (16) catches fire, the local temperature rises, the middle part of the hot melt sheet (201) begins to soften, the strength is reduced, the hot melt sheet (201) is broken under the action of the gravity of fire extinguishing sand in the sand box (1), the bottom plate (101) turns downwards, the fire extinguishing sand in the sand box (1) falls down and covers the fire point of the cable (14), and the flame is extinguished;
C. the first temperature sensor (3013) detects that the local temperature of the cable trench (16) rises, transmits a signal to the control center, the control center automatically sends an instruction to the inspection device (4), the electric control board (11) controls the dual-output-shaft motor (6) to be started, and the dual-output-shaft motor (6) controls the driving wheel (601) to rotate to drive the inspection device (4) to move to a corresponding position;
D. when the inspection device (4) moves, the camera (4021) and the searchlight (4022) are started, and the screen of the control center of a cable pit (16) management enterprise can display the content shot by the camera (4021);
E. when the inspection device (4) moves to a specified position, the second temperature sensor (12) can detect the temperature of a cable (14) below the inspection device again, whether fire light exists or not can be detected through the photosensitive sensor (13), when the fire light exists, the electric control plate (11) controls the second electric telescopic device (906) to be started, the second electric telescopic device (906) controls the control rod (905) to move towards the sealing film (9011), the sealing film (9011) is pierced through the needle tube (9052), a fire extinguishing agent in the fire extinguishing box (901) is discharged into the control tube (902) through the through hole (90521) in the needle tube (9052), and then the fire extinguishing agent is sprayed out through the fire extinguishing agent spraying hole (9031) to extinguish the fire;
F. the inspection device (4) can be used for daily inspection, the temperature of the surface of the cable (14) is detected through the second temperature sensor (12), data are transmitted to a control center of a management company in real time or at intervals, and management personnel can conveniently predict in advance through the temperature of the cable (14) and make corresponding treatment.
2. The safety protection method for the high-voltage cable trench according to claim 1, wherein:
the inner part of the control pipe (902) is provided with a sealing boss (9021), the sealing boss (9021) is arranged between an opening of the middle connecting pipe (904) on the control pipe (902) and the sealing plate (9051), and the inner diameter of the sealing boss (9021) is smaller than the outer diameter of the sealing plate (9051).
3. The safety protection method for the high-voltage cable trench according to claim 1, wherein:
the inspection device (4) is internally provided with a short-circuit device (8), the short-circuit device (8) comprises a plurality of electromagnets (801) which are arranged in parallel, the electromagnets (801) are fixedly connected with the bottom surface of the inspection device (4),
an intermediate shaft (802) penetrates through the middle of the electromagnet (801), the lower end of the intermediate shaft (802) penetrates below the outer part of the inspection device (4), a conical needle head (803) with an inverted shape is arranged at the lower end of the intermediate shaft (802), the needle head (803) is positioned right above the cable (14),
a spring top plate (804) is arranged at the upper end of the intermediate shaft (802), a thrust spring (806) is arranged between the spring top plate (804) and the electromagnet (801), a conductive column (805) is arranged at the upper end of the spring top plate (804),
the conductive post (805) is sleeved with a conductive plate (10), one end of the conductive plate (10) penetrates through the outer portion of the inspection device (4), and the conductive plate (10) penetrates through the outer end of the inspection device (4) and is in electric conduction contact with the side wall of the cable trench (16).
4. The high-voltage cable trench safety protection method according to claim 3, wherein:
when the cable (4) is detected to be on fire, the electric control board (11) controls the electromagnet (801) to be electrified, the electromagnet (801) adsorbs the spring top plate (804), the middle shaft (802) moves downwards, the needle head (803) punctures the sheath of the cable (14) below the electromagnet, then the cable (14) is rapidly grounded through the conductive plate (10), the grounding protection of the cable (14) is started, and the accident is prevented from further expanding.
5. The high-voltage cable trench safety protection method according to claim 3, wherein:
the conducting plate (10) penetrates through one end of the outer portion of the inspection device (4) and is provided with a conducting roller (1001) capable of freely rotating, and the conducting roller (1001) is in contact with the side wall of the cable trench (16).
6. The high-voltage cable trench safety protection method according to claim 3, wherein:
the inspection device (4) comprises an upper end box (401) and a lower end box (402) which are arranged up and down,
a double-output shaft motor (6) and a power supply device (7) are arranged inside the upper end box (401),
the first electric telescopic device (5), the short-circuit device (8), the fire extinguishing device (9) and the electric control board (11) are arranged inside the lower end box (402).
7. The high-voltage cable trench safety protection method according to claim 6, wherein:
two front and back end surfaces of the lower end box (402) are respectively provided with a camera (4021), searchlights (4022) are arranged around the cameras (4021),
the bottom surface of the lower end box (402) is provided with a plurality of second temperature sensors (12) and photosensitive sensors (13), probes of the second temperature sensors (12) are opposite to cables (14) right below the second temperature sensors,
the camera (4021), the searchlight (4022), the second temperature sensor (12) and the photosensitive sensor (13) are electrically connected with the electric control board (11) respectively.
8. The safety protection method for the high-voltage cable trench according to claim 1, wherein:
the electric control board (11) is integrated with an industrial control chip, a wireless signal transmission module, a wireless signal receiving module and a Beidou positioning module.
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| CN116826638B (en) * | 2023-08-31 | 2023-12-05 | 国网山东省电力公司五莲县供电公司 | Power supply line erects structure |
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Denomination of invention: A safety protection method for high-voltage cable trenches Effective date of registration: 20231218 Granted publication date: 20210319 Pledgee: Postal Savings Bank of China Limited Jinan Licheng District Sub-branch Pledgor: Shandong Hedi Intelligent Technology Co.,Ltd. Registration number: Y2023980072115 |
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