CN111317941B - Cooperative control method and system for insulation and evaporation prevention performance based on aviation fire extinguishing - Google Patents
Cooperative control method and system for insulation and evaporation prevention performance based on aviation fire extinguishing Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 57
- 238000001704 evaporation Methods 0.000 title claims abstract description 55
- 230000008020 evaporation Effects 0.000 title claims abstract description 53
- 230000002265 prevention Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000009792 diffusion process Methods 0.000 claims abstract description 51
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 239000000779 smoke Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000016507 interphase Effects 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 4
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- 150000001875 compounds Chemical class 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
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- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/02—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires
- A62C3/0228—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires with delivery of fire extinguishing material by air or aircraft
- A62C3/0242—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires with delivery of fire extinguishing material by air or aircraft by spraying extinguishants from the aircraft
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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Abstract
The invention provides an insulation and evaporation prevention performance cooperative control method and system based on aviation fire extinguishing, which comprises the following steps: the method comprises the steps of obtaining the height of a wire pair to the ground of a power transmission line section in a mountain fire scene, and dividing a water falling body of a fire extinguishing agent into an evaporation prevention section, an enveloping wire section and a wire pair section between the initial flight height of an aviation fire extinguishing device and the wire according to the height of the wire pair to the ground; calculating the temperatures of the high-temperature smoke plume of the mountain fire scene at different heights, calculating the heating temperature of the fire extinguishing agent in the falling process of the evaporation prevention section according to the boundary condition of heat exchange between the set fire extinguishing agent and the high-temperature smoke plume of the fire scene, and calculating the average diffusion degree of the fire extinguishing agent in the enveloping wire section when the fire extinguishing agent falls to the ground height of the wire; judging the relationship between the heating temperature and the failure temperature threshold of the evaporation prevention system and the relationship between the average diffusion degree and the insulation critical diffusion degree; and adjusting the flying height of the aviation fire extinguishing device according to the relation.
Description
Technical Field
The invention relates to the technical field of forest fire prevention and control of power transmission lines, and particularly discloses a cooperative control method and system for insulation and evaporation prevention performance based on aviation fire extinguishment.
Background
In recent years, due to the influence of continuous drought weather and production and life of residents nearby an electric transmission line, the frequent occurrence of mountain fire accidents in a corridor of the electric transmission line seriously threatens the safe and stable operation of a power grid.
The helicopter is adopted for fire extinguishing, so that the helicopter is not limited by external conditions such as ground road blockage and the like, and can quickly reach a fire scene for fire extinguishing. However, the mountain fire field environment of the power transmission line is complex, the fire extinguishing water agent for aviation fire extinguishment depends on the experience of a pilot, but factors such as field wind speed, fire field smoke plume speed and fire field temperature have great influence on the accuracy of the fire extinguishing water agent, and low-accuracy fire extinguishment wastes a large amount of fire extinguishing water agent. Meanwhile, the temperature of the forest fire site of the power transmission line is high, and the evaporation capacity of the fire extinguishing water agent in the falling process reaches 60% -80%, so that the evaporation capacity of the fire extinguishing water agent must be considered when the aviation fire extinguishing evaluation of the forest fire of the power transmission line is carried out. The method for reducing the evaporation capacity of the fire extinguishing water agent is to reduce the volume of the fire extinguishing water agent, so that the fire extinguishing water agent is kept as an integral water column, and the fire extinguishing water agent is prevented from being diffused. However, the voltage of the power transmission line is as high as 1000kV, when the flow rate is 240L/min, the density of the water aqua is 36 times higher than that of rainstorm (16mm/h), and when the whole water column flows through interphase gaps of the power transmission line or gaps between the power transmission line and the ground from a high place, the power transmission line is easy to trip or even discharge to a helicopter, and the water aqua cannot be applied to fighting the forest fire of the power transmission line. From the above description, it can be known that when the fire extinguishing water agent is sprayed in the form of water column, the fire extinguishing water agent has small diffusion area but poor insulation performance; when the fire extinguishing water agent is dispersed at the outlet, the fire extinguishing water agent has good insulating property at the low altitude of the power transmission line, but the evaporation capacity is particularly large in the falling process. Namely, the insulation performance and the evaporation prevention are contradictory.
Disclosure of Invention
The invention aims to provide a cooperative control method and a cooperative control system for insulation and evaporation prevention performance based on aviation fire extinguishment, and aims to solve the technical defect that the cooperative control is not carried out by using the contradiction between the insulation performance and the evaporation prevention performance in the aviation fire extinguishment in the prior art.
In order to achieve the above purpose, the present invention provides a cooperative control method of insulation and evaporation prevention performance based on aviation fire extinguishing, referring to fig. 1, comprising the following steps:
s1: obtaining sections of power transmission lines in mountain fire sceneHeight H of wire to groundlineAnd a wire safety distance LaDividing the water falling body of the fire extinguishing agent into an initial flying height of the aviation fire extinguishing device and an evaporation prevention section [ H ] between the wires according to the height of the wires to the groundline+La，H0]Envelope wire section [ H ]line,Hline+La]And wire pair section [0, Hline]。
Referring to fig. 2, the enveloping conductor segment is a safe distance from the conductor to the upper part of the conductor corresponding to the voltage level, the conductor-to-ground segment is a segment between the transmission conductor and the ground, and the segment between the aviation fire extinguishing device and the conductor, from which the enveloping conductor segment is removed, is an evaporation-preventing segment.
S2: and calculating the temperatures of the high-temperature smoke plume of the mountain fire scene at different heights, and calculating the heating temperature of the fire extinguishing water agent in the falling process of the evaporation prevention section according to the set boundary condition of heat exchange between the fire extinguishing water agent and the high-temperature smoke plume of the fire scene.
Referring to fig. 3, the temperature calculation method of the high temperature smoke plume of the mountain fire scene at different heights is as follows:
referring to fig. 4, the partitions of the power transmission line forest fire thermal flow field model generally include a flame region, an intermittent region and a smoke region. Correspondingly, the values of the parameters of the power transmission line forest fire thermal flow field model are shown in the following table 1:
table 1:
| plume range | Range of height values | N | |
| Flame zone | |||
| 0<z<1.32 | 1/2 | 2.18 | |
| Batch zone | 1.32<z<3.30 | 0 | 2.45 |
| Smoke zone | 3.30<z | -1/3 | 3.64 |
The formula is calculated from the temperatures of the flame zones (continuous flame zone and intermittent flame zone):
in the formula: t is the temperature rise of the position where the height of the flame body is z relative to the ambient temperature; t isaIs ambient temperature; z is a radical ofdThe height of the vegetation burning area; i is the intensity of mountain fire; d1The sum of the flame height, the height of the continuous flame zone and the height of the intermittent flame zone;
in the smoke zone, since there is no flame anymore, the air above is heated only by means of the radiant heat generated by the flame, and the temperature T thereof in relation to the gap height z can be described by the following equation:
s3: judging the magnitude relation between the heating temperature and the anti-evaporation system failure temperature threshold value,calculating the height H of the fire extinguishing agent falling to the conducting wire to the ground according to the size relationlineThe fire extinguishing water agent is in the enveloped wire section [ H ]line,Hline+La]And calculating the average diffusion degree of the fire extinguishing agent in the section [0, H ] of the lead pairline]Average degree of diffusion.
The determining parameter of the diffusion degree is the diffusion angle alpha, and the determining parameter of the diffusion angle is the temperature threshold value. When the heating temperature T1 is higher than the failure temperature threshold Th of the evaporation-proof system, the fire extinguishing agent begins to diffuse rapidly, namely the diffusion angle is increased; when the heating temperature T1 is lower than the failure temperature threshold Th of the fire extinguishing system, the fire extinguishing water agent diffuses at the original speed. The following table 2 shows the values of the diffusion angle alpha of the fire extinguishing agent.
TABLE 2
The cone angle of diffusion of the fire extinguishing water agent when the fire extinguishing water agent begins to diffuse rapidly is 25-50 degrees, and the cone angle of diffusion of the fire extinguishing water agent when the fire extinguishing water agent diffuses at the original speed is 5-15 degrees. The failure temperature threshold Th of the evaporation prevention system is 80-150 ℃.
S4: putting the fire extinguishing water agent in the enveloped wire section [ H ]line,Hline+La]Average diffusion degree of fire extinguishing agent in wire pair region [0, Hline]The magnitude relation between the average diffusion degree and the insulation critical diffusion degree of the aerial fire-extinguishing device is used as an adjustment constraint, and the flying height of the aerial fire-extinguishing device is adjusted according to the adjustment constraint.
Referring to fig. 5, assuming that the initial flying height of the helicopter fire extinguishing apparatus is H0, it is necessary to calculate whether 3 requirements are met when the helicopter is extinguishing a fire:
the method comprises the following steps of 1: and (4) evaporation prevention, wherein the smaller the evaporation amount is, the better the alternative condition is. The higher the height, the worse the evaporation prevention property.
The method comprises the following steps: the enveloping conductor section is insulated, the conditions are selected necessarily, tripping is not met, and the influence is great. The higher the height, the better the insulation properties of the enveloping conductor segments.
Requirement 3: the wire is insulated to the section, must select the condition, unsatisfied can trip, and the influence is very big. The higher the height, the better the wire-to-site insulation.
When the requirement 1 is met, the flight height interval of the aviation fire extinguishing device with the evaporation capacity of the power transmission line forest fire extinguishing water agent being less than 40% is H < H1. 40% of the values are established and can be changed;
when the requirement 2 is met, the flying height interval of the aviation fire extinguishing device without the interphase flashover of the power transmission line is H & gt H2;
when the requirement 3 is met, the ground insulation performance of the fire extinguishing agent just meets the height required by gap insulation, and the flying height interval of the aviation fire extinguishing device is H & gt H3;
m1: if H1< min (H2, H3), the flying height of the aviation fire extinguishing device is taken as H > max (H2, H3), and the evaporation prevention effect is poor at the moment, but two insulation requirements are certainly met;
m2: if min (H2, H3) < H1< max (H2, H3), the flying height of the aviation fire extinguishing device is taken as H > max (H2, H3), the evaporation prevention effect is better than that of the case M1, and two insulation requirements are certainly met;
m3: if H1> max (H2, H3), the flying height of the aviation fire extinguishing device is taken as max (H2, H3) < H < H1, and at the moment, the requirements of the evaporation prevention effect and two insulation requirements are met.
Parameters influencing the insulating property of the fire extinguishing water agent comprise: voltage class, particle size, number of particles per unit volume. The average diffusion degree is determined by the unit area dosage of the fire extinguishing water agent. The value of the insulation critical diffusion degree (the dosage of the fire extinguishing agent per unit area) is less than 3 mm. The average diffusion degree of the fire extinguishing agent on the wire to the area is Q/S. S is the area of the fire extinguishing agent spread below the conducting wire, and the area has corresponding calculation relation with H, H1, H2 and H3.
The average diffusion degree exceeds the insulation critical diffusion degree by 30 percent, and the flying height of the aviation fire extinguishing device is reduced by 5 percent; the diffusion degree of the fire extinguishing agent is less than the insulation critical diffusion degree, and the flying height of the aviation fire extinguishing device is improved by 5 percent.
By means of the method, the invention further provides an insulation and evaporation prevention performance cooperative control system based on aerial fire extinguishment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of any one of the methods.
The invention has the following beneficial effects:
the invention discloses a method for cooperatively controlling insulation performance and evaporation resistance. The method comprises the steps of analyzing the heating degree of a fire extinguishing agent in the air by setting the flying height of an aviation fire extinguishing device to obtain the failure degree of an evaporation prevention system of the fire extinguishing agent; and further utilizing the characteristic that the evaporation-proof fire extinguishing agent is particularly sensitive to temperature, and calculating the diffusion state of the fire extinguishing agent of the aviation fire extinguishing device in the air according to the failure degree of the fire extinguishing agent evaporation-proof system, thereby obtaining the insulation performance evaluation of the fire extinguishing agent in the air. And then adjusting the flying height of the aviation fire extinguishing device until the fire extinguishing water agent simultaneously meets the evaporation resistance and the insulation performance. The invention considers the process that the evaporation-proof fire-extinguishing water agent is heated and evaporated at high altitude to influence the concentration, thereby calculating the diffusion degree of the evaporation-proof fire-extinguishing water agent; the invention contrasts and analyzes the insulating property of the evaporation-proof fire-extinguishing water agent in the enveloped conductor section, and provides evaluation basis for avoiding interphase flashover of fire extinguishment of the aviation helicopter. The invention contrasts and analyzes the insulating property of the evaporation-proof fire-extinguishing water agent in a wire-to-field area, and provides evaluation basis for avoiding single-phase-to-ground flashover of aviation helicopters during fire extinguishing.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of the cooperative control method for insulation and evaporation prevention performance based on aviation fire extinguishing;
FIG. 2 is a schematic diagram of a subsection condition in the cooperative control method of the insulation and evaporation prevention performance based on aviation fire extinguishing of the invention;
FIG. 3 is a schematic view of a falling scene of a fire extinguishing agent in the cooperative control method of insulation and evaporation prevention performance based on aviation fire extinguishing;
FIG. 4 is a schematic diagram of a fire scene temperature scene in the cooperative control method of insulation and evaporation prevention performance based on aviation fire extinguishment;
FIG. 5 is a schematic diagram of the distribution of H1, H2 and H3 in the cooperative control method of the insulation and evaporation prevention performance based on aviation fire extinguishing.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
The embodiment provides a method for controlling the specific operation steps of an aviation device based on the cooperative control of the insulation and evaporation prevention performance of aviation fire extinguishing:
firstly, a mountain fire occurs below a tower receiving the 220kV purple curtain II line #43 for alarming.
Inquiring that the height of the lead of the power transmission line section to the ground is 13m through a PMS; the safety distance corresponding to 220kV is 3m, so that the height of the enveloping conductor section is in a height interval of 13-16 m; the flying speed of the aviation fire extinguishing device is 13.8m/s, the spraying flow is 80L/s, and 34m between the initial flying height of 50m and the 16m position of the enveloping conductor section is an evaporation prevention section; the wire pair section is in a height interval of 0-13 m.
Then, the temperature curve of the mountain fire scene is calculated and obtained as shown in fig. 4. The temperature was 150 ℃ at 12m and 80 ℃ at 18m,
then, parameters are obtained: the wind speed of the site is 2.8m/s, the diffusion angle of the fire extinguishing water agent at the height of 18m-50m is 10 degrees, the diffusion angle at the height of 12 m-18 m is 35 degrees, and the diffusion angle at the height of 0 m-12 m is 40 degrees, so the diffusion degree of the fire extinguishing water agent at the wire enveloping section of 13 m-16 m is calculated as follows:
the calculation method of the diffusion area at the height of 16m is as follows:
3.14*((50-18)*SIN(10/360)+(18-16)*SIN(35/360))*((50-18)*SIN(10/360)
+(18-16)*SIN(35/360))+((50-18)*SIN(10/360)+(18-16)
*SIN(35/360))*13.8＝18.72m2
the dosage of the fire extinguishing water agent per unit area at the height of 16m is as follows:
80/18.72＝4.27
the calculation method of the diffusion area at the height of 13m is as follows:
3.14*((50-18)*SIN(10/360)+(18-13)*SIN(35/360))*((50-18)*SIN(10/360)
+(18-13)*SIN(35/360))+((50-18)*SIN(10/360)+(18-13)
*SIN(35/360))*13.8＝25.01m2
the dosage of the fire extinguishing water agent per unit area at the height of 13m is as follows:
80/25.01＝3.20
finally, comparing the diffusion insulation degree of the fire extinguishing agent at the enveloping section of the wire with the insulation critical diffusion degree of the fire extinguishing agent, the diffusion insulation degrees at the heights of 13m and 16m are both 3.0mm greater than the insulation critical diffusion degree of the fire extinguishing agent, so that the requirement of insulation can not be met, and the flying height of the aviation fire extinguishing device is increased by 5 percent, namely 2.5 m.
The fire extinguishing agent dosage per unit area at the height of 16m is 3.97 by adopting the calculation of the flight height of 52.5m, and the fire extinguishing agent dosage per unit area at the height of 13m is 3.0. Still not satisfying the insulation requirement, when increasing the height through 4 rounds, namely 52.5 (1.05)4 ═ 63.8m, the degree of insulation diffusion at the height of 16m was 2.94mm, and the degree of insulation diffusion at the position of 13m was 2.34 mm. The insulation requirement is met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The cooperative control method for the insulation and evaporation prevention performance based on aviation fire extinguishing is characterized by comprising the following steps:
s1: obtaining the height of the wire of the section of the power transmission line in the mountain fire scene to the ground
And wire safety distance
Dividing the area of the water body where the fire extinguishing agent falls into an evaporation prevention section according to the height of the conducting wire to the ground
Envelope wire section
And a wire pair section
Wherein
The initial flying height of the aviation fire extinguishing device;
s2: calculating the temperature of the high-temperature smoke plume of the mountain fire scene at different heights, and calculating the heating temperature of the fire extinguishing water agent in the falling process of the evaporation prevention section according to the boundary condition of heat exchange between the set fire extinguishing water agent and the high-temperature smoke plume of the fire scene;
s3: judging the magnitude relation between the heating temperature and the failure temperature threshold of the evaporation prevention system, and calculating the height of the fire extinguishing agent falling to the ground of the guide line according to the magnitude relation
The fire extinguishing water agent is in the enveloped wire section
And calculating the average diffusion degree of the fire extinguishing agent in the section of the lead pair
Average degree of diffusion of;
s4: will be provided withFire extinguishing water agent in enveloped wire section
Average diffusion degree of the fire extinguishing water agent in the wire pair section
The magnitude relation between the average diffusion degree and the insulation critical diffusion degree of the aerial fire-extinguishing device is used as an adjustment constraint, and the flying height of the aerial fire-extinguishing device is adjusted according to the adjustment constraint.
2. The collaborative control method for the insulation and evaporation prevention performance based on aviation fire extinguishment according to claim 1, wherein the influence of the magnitude relation between the heating temperature and the evaporation prevention system failure temperature threshold value on the diffusion of the fire extinguishing water agent in S3 comprises the following steps:
when the heating temperature T1 is higher than the failure temperature threshold Th of the evaporation prevention system, the fire extinguishing agent begins to diffuse rapidly;
when the heating temperature T1 is lower than the failure temperature threshold Th of the evaporation prevention system, the fire extinguishing water agent diffuses at the original speed;
wherein the failure temperature threshold Th of the evaporation prevention system is 80-150 ℃.
3. The collaborative aviation fire suppression based insulation and evaporation prevention performance control method according to claim 1, wherein the adjustment constraints include:
the flying height interval of the aviation fire extinguishing device which ensures the insulation of the enveloped wire section and does not generate the interphase flashover of the power transmission line is
；
In order to ensure the insulation of the enveloped wire section, the flying height threshold value of the aviation fire extinguishing device does not generate interphase flashover of the power transmission line;
ensure the insulation of the wire to the ground section and meet the requirementThe flying height interval of the aviation fire extinguishing device with the requirement of gap insulation is
；
In order to ensure that the wire is insulated to the section, the flying height threshold value of the aviation fire extinguishing device meeting the gap insulation requirement is met.
4. The collaborative aviation fire suppression based insulation and evaporation prevention performance control method according to claim 3, wherein the adjustment constraints further include:
the flight height interval of the aviation fire extinguishing device when the evaporation capacity of the fire extinguishing water agent is less than 40 percent due to the forest fire of the power transmission line is
，
The flying height of the aviation fire extinguishing device is the flying height of the power transmission line forest fire when the evaporation capacity of the fire extinguishing agent is 40%.
5. The cooperative control method for insulation and evaporation prevention performance based on aviation fire extinguishment as claimed in claim 4, wherein the manner of adjusting the flying height of the aviation fire extinguishing apparatus according to the adjustment constraint is as follows:
when the average diffusion degree is less than 30% of the insulation critical diffusion degree, the flying height of the aviation fire extinguishing device is reduced by 5%; when the diffusion degree of the fire extinguishing agent is greater than the insulation critical diffusion degree, the flying height of the aviation fire extinguishing device is improved by 5%.
6. The cooperative control method for insulation and evaporation prevention performance based on aviation fire extinguishment as claimed in claim 1, wherein the temperature calculation method of high-temperature smoke plumes of a fire scene at different heights in S2 is as follows:
the temperature calculation formula of the flame zone, namely the continuous flame zone and the intermittent flame zone is as follows:
in the formula (I), the compound is shown in the specification,
the height of the flame body is
A temperature rise relative to ambient temperature;
is ambient temperature;
the height of the vegetation burning area;
the intensity of mountain fire;
the sum of the flame height, the height of the continuous flame zone and the height of the intermittent flame zone;
is the diffusion angle of the fire extinguishing water agent;
in the smoke region, since there is no flame, the air above is heated only by the radiant heat generated by the flame, the temperature of which is
Height of clearance with
Can be described by the following equation:
7. the cooperative control method for insulation and evaporation prevention performance based on aviation extinguishment as claimed in claim 1, wherein the cone angle of diffusion of the fire-extinguishing water agent when the fire-extinguishing water agent is rapidly diffused is 25 ° to 50 °, and the cone angle of diffusion of the fire-extinguishing water agent when the fire-extinguishing water agent is diffused at the original speed is 5 ° to 15 °.
8. The collaborative control method for insulation and evaporation prevention performance based on aviation extinguishment according to claim 3, wherein the average diffusion degree is determined by a unit area dosage of the fire-extinguishing water agent.
9. Cooperative control system for insulation and anti-evaporation performance based on aviation fire extinguishment, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the computer program realizes the steps of the method according to any of the preceding claims 1 to 8.
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| DE10230636A1 (en) * | 2002-07-08 | 2004-01-29 | Ewald Peters | Protective firewall plate folds up like blind and is carried by helicopter to forest fires, buildings fires etc |
| CN103432700B (en) * | 2013-09-16 | 2015-03-18 | 国家电网公司 | Method for quickly extinguishing mountain fire along power transmission lines |
| ES2682964B1 (en) * | 2017-02-24 | 2019-07-03 | Salmeron Antoni Abellan | AEROTRANSPORTABLE PRESSURE LIQUID LAUNCH DEVICE |
| CN110755769B (en) * | 2019-10-30 | 2021-03-23 | 湖南省湘电试研技术有限公司 | Helicopter fire extinguishing system |
| CN110639147B (en) * | 2019-11-12 | 2021-05-11 | 国网湖南省电力有限公司 | Power transmission line forest fire aviation fire extinguishing device |
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