CN209802622U - Insulator crushing and falling tolerance test device - Google Patents
Insulator crushing and falling tolerance test device Download PDFInfo
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- CN209802622U CN209802622U CN201920903503.8U CN201920903503U CN209802622U CN 209802622 U CN209802622 U CN 209802622U CN 201920903503 U CN201920903503 U CN 201920903503U CN 209802622 U CN209802622 U CN 209802622U
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Abstract
The utility model discloses an insulator crushing and dropping tolerance performance test device, which belongs to the technical field of insulator test equipment, and comprises an insulator fixing mechanism, a spraying mechanism and a vibration generating mechanism, wherein the insulator fixing mechanism comprises a shell, a transverse support frame and a longitudinal support frame which are fixed in the shell; the spraying mechanism comprises a spray head and a water delivery mechanism, wherein the spray head is hung above the transverse support frame and the longitudinal support frame, and the water delivery mechanism is connected between the spray head and the water storage device; the vibration generating mechanism comprises an air dispersing pore plate which is fixed in the shell and the air outlet of which faces the transverse support frame and the longitudinal support frame, a vibration generator which is fixedly connected with the transverse support frame and the longitudinal support frame, and an air blower which is arranged outside the shell, wherein the diameter of the shell is reduced from top to bottom in sequence. The device has the function of detecting the breeze vibration resistance and strong wind and rain resistance of the broken anti-fracture falling glass composite insulator, and is simple in structure and convenient to operate.
Description
Technical Field
The utility model belongs to the technical field of insulator test equipment, it drops endurance test device to relate to the insulator breakage.
Background
The breeze vibration is a high-frequency (f is 5Hz-100Hz) low-amplitude (A is less than or equal to the diameter of a wire and is only about 10mm in some cases) standing wave type vibration, and although the energy and the amplitude of the breeze vibration are not large, the vibration time is long, and accounts for about 30-50% of the whole year. Jiangsu province belongs to the Yangtze river delta area, the annual rainwater is more, according to the statistics of meteorological departments, the instantaneous maximum rainfall in the Jiangsu province is 5mm/min (reduced to 300mm/h), and the duration of heavy rainstorm is generally within 30 min.
The insulator is one of the key parts of the high-voltage transmission line, and the performance of the insulator directly influences the operation safety of the whole transmission line. The glass insulator is widely applied due to the characteristics of zero value self-breaking, easy maintenance and the like. The glass composite insulator has the dual advantages of the glass insulator and the composite insulator, and the anti-breaking falling glass composite insulator has the characteristics of easy detection of normal breakage and no falling of broken glass fragments. For the design of the anti-fracture falling type glass composite insulator, the anti-breeze vibration capability and the anti-pollution rain flashover capability of the anti-fracture falling type glass composite insulator need to be considered, and the existing insulator detection equipment cannot have the capability of detecting the anti-breeze vibration capability and the anti-strong wind and rain capability of the anti-fracture falling type glass composite insulator at the same time.
Disclosure of Invention
The utility model discloses an overcome prior art's defect, designed the broken tolerance capability test device that drops of insulator, have concurrently to the anti breeze vibration ability and the anti strong wind ability of drenching with rain after the breakage-proof type glass composite insulator that falls broken carry out the function that detects, simple structure, convenient operation.
The utility model adopts the following specific technical proposal: insulator breakage tolerance test device that drops, including insulator fixed establishment, spray the mechanism and wind load and the little wind of simulation vibration emergence mechanism, the key lies in: the insulator fixing mechanism comprises a shell, a transverse support frame for fixing a transverse insulator string and a longitudinal support frame for fixing a longitudinal insulator string, wherein the transverse support frame and the longitudinal support frame are fixed in the shell; the spraying mechanism comprises a spray head and a water delivery mechanism, wherein the spray head is hung above the transverse support frame and the longitudinal support frame, and the water delivery mechanism is connected between the spray head and the water storage device; the vibration generating mechanism comprises an air dispersing pore plate which is fixed in the shell and the air outlet of which faces the transverse support frame and the longitudinal support frame, a vibration generator which is fixedly connected with the transverse support frame and the longitudinal support frame, and an air blower which is arranged outside the shell, wherein the outlet of the air blower is connected with the inlet of the air dispersing pore plate, a rainproof cover is fixed on the periphery of the vibration generator, and the diameter of the shell is sequentially reduced from top to bottom.
The casing inside be fixed with the support horizontal pole, support the radial setting of horizontal pole along the casing, the bottom of horizontal support frame and vertical support frame all with support horizontal pole fixed connection, vibration generator also with support horizontal pole fixed connection.
The vibration generator comprises an X-axis vibration generator and a Y-axis vibration generator, and the X-axis vibration generator and the Y-axis vibration generator are fixedly connected with the supporting cross rod.
The horizontal support frame include two montants that the symmetry set up, the lower extreme and the support horizontal pole fixed connection of montant, the upper end of montant all is provided with splint and mounting groove, the one end of splint is articulated with the montant, the other end is with the help of connecting piece and montant fixed connection, the cavity between splint and the mounting groove forms the fixed chamber of horizontal insulator chain.
The longitudinal support frame is a positioning column, a positioning groove is formed in the upper end of the positioning column, and the lower end of the longitudinal insulator string is fixedly connected with the positioning groove in an inserting mode.
The shell comprises an upper shell and a lower shell, the upper shell is fixedly connected with a support arranged below the upper shell, the transverse support frame, the longitudinal support frame, the air dispersing pore plate and the spray head are all positioned in the upper shell, one end of the lower shell is hinged with the upper shell, and the other end of the lower shell is detachably connected with the upper shell by virtue of a locking piece, so that the lower shell has turnover freedom.
The locking piece comprises a transverse plate fixed on the outer wall of the upper shell and an L-shaped connecting rod hinged with the lower shell, and a longitudinal rod of the L-shaped connecting rod is in threaded connection with a nut arranged above the transverse plate after penetrating through a through hole formed in the transverse plate.
The locking piece comprises a hook fixed on the outer wall of the upper shell and a hanging ring hinged with the lower shell, and the hanging ring is matched with the hook to fixedly connect the lower shell and the upper shell.
The bottom of the shell is provided with a water outlet which is communicated with a water return port of the water storage device by virtue of a drainage pipeline, and the drainage pipeline is provided with a drainage valve.
The shell is coiled into a spiral structure along the vertical direction, and the transverse support frame, the longitudinal support frame, the spray head, the air dispersing pore plate and the vibration generator are all positioned at the bottom in the shell.
The utility model has the advantages that: when a breeze vibration test is carried out, tension is formed on the insulator string through the tension mechanism, so that the insulator string is tensioned in the shell by an online operation actual stress load, and the low-frequency vibration of the vibration generator is utilized to simulate the breeze vibration on the line of the insulator. And after the set vibration times are passed, checking the integrity state of the broken glass composite insulator of the umbrella disc, and if the broken umbrella disc of the test article is not fallen off and the amount of the scattered and dropped glass fragments is less than or equal to 2%, the test is passed.
When a strong wind rain test is carried out, strong wind is sent to the longitudinal insulator string and the transverse insulator string in the shell by using the air blower and is used for simulating lateral wind perpendicular to the insulator strings and axial wind perpendicular to the downwind direction of the insulator strings respectively. And the water in the water storage device is sprayed out by the spray head by using the water delivery mechanism and falls on the transverse insulator string and the longitudinal insulator string. And (3) checking the integrity state of the broken glass composite insulator of the umbrella disc after the set rainfall amount and strong wind action time, and if the broken umbrella disc of the test article does not fall off yet and the amount of the scattered and dropped glass fragments is less than or equal to 2%, the test is passed.
The utility model discloses a test device has the function that anti breeze vibration ability and anti strong wind drench rain ability to anti breaking type glass composite insulator that falls concurrently and detect, simple structure, convenient operation.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a side view of the middle horizontal support frame of the present invention.
In the attached drawings, 1 represents a shell, 2 represents a transverse support frame, 2-1 represents a vertical rod, 2-2 represents a clamping plate, 2-3 represents a cross rod, 2-4 represents a bolt, 3 represents a longitudinal support frame, 4 represents a spray head, 5 represents a water storage device, 6 represents a water delivery mechanism, 7 represents an air dispersing hole plate, 8 represents a vibration generator, 9 represents a blower, 10 represents a support cross rod, 11 represents a transverse plate, 12 represents an L-shaped connecting rod, 13 represents a drain valve, 14 represents a transverse insulator string, 15 represents a longitudinal insulator string, 16 represents a valve, and 17 represents a flowmeter.
Detailed Description
The present invention will be described in detail with reference to the following drawings and specific embodiments:
in a specific embodiment, as shown in fig. 1 and 2, the device for testing the breakage and drop resistance of the insulator comprises an insulator fixing mechanism, a spraying mechanism and a vibration generating mechanism for wind load and breeze simulation, wherein the insulator fixing mechanism comprises a shell 1, a transverse support frame 2 for fixing a transverse insulator string 14 and a longitudinal support frame 3 for fixing a longitudinal insulator string 15, and the transverse support frame 2 and the longitudinal support frame 3 are both fixed in the shell 1; the spraying mechanism comprises a spray head 4 which is hoisted above the transverse support frame 2 and the longitudinal support frame 3, and a water delivery mechanism 6 which is connected between the spray head 4 and the water storage device 5; the vibration generating mechanism comprises an air dispersing pore plate 7 which is fixed in the shell 1 and has an air outlet facing the transverse support frame 2 and the longitudinal support frame 3, a vibration generator 8 which is fixedly connected with the transverse support frame 2 and the longitudinal support frame 3, and an air blower 9 arranged outside the shell 1, wherein the transverse insulator string 14 and the longitudinal insulator string 15 are both positioned in the coverage range of the air dispersing pore plate 7, the outlet of the air blower 9 is connected with the inlet of the air dispersing pore plate 7, a rain cover is fixed on the periphery of the vibration generator 8, and the diameter of the shell 1 is sequentially reduced from top to bottom. In order to control the amount of water sprayed, a valve 16 and a flow meter 17 are connected to the water supply pipeline between the water supply mechanism 6 and the spray head 4, so that the water supply pipeline can be accurately adjusted. In order to prevent the wind direction of the wind dispersing pore plate 7 from being diffused all around, wind shielding eaves are arranged at the edges of the end surfaces of the wind dispersing pore plate 7 facing the transverse support frame 2 and the longitudinal support frame 3.
As right the utility model discloses a further improvement, 1 inside support horizontal pole 10 that is fixed with of casing supports horizontal pole 10 along 1 radial setting of casing, and the bottom of horizontal support frame 2 and vertical support frame 3 all with support horizontal pole 10 fixed connection, vibration generator 8 also with support horizontal pole 10 fixed connection. As shown in fig. 1, the transverse support frames 2 and the longitudinal support frames 3 are arranged in the left-right direction in the shell 1, so that enough operating spaces are reserved between the transverse insulator strings 14 and the shell 1, between the longitudinal insulator strings 15 and the shell 1, and between the transverse insulator strings 14 and the longitudinal insulator strings 15, and after the transverse insulator strings 14 and the longitudinal insulator strings 15 are installed, the test article can be conveniently broken.
The vibration generator 8 comprises an X-axis vibration generator and a Y-axis vibration generator which are fixedly connected with the support cross bar 10. The X-axis vibration generator and the Y-axis vibration generator can be used for realizing vibration reversing in the test process, and the obtained test data is more accurate.
The transverse support frame 2 comprises two vertical rods 2-1 which are symmetrically arranged, the lower ends of the vertical rods 2-1 are fixedly connected with a support cross rod 10, the upper ends of the vertical rods 2-1 are respectively provided with a clamping plate 2-2 and a mounting groove, one end of the clamping plate 2-2 is hinged to the vertical rod 2-1, the other end of the clamping plate 2-2 is fixedly connected with the vertical rod 2-1 through a connecting piece, and a cavity between the clamping plate 2-2 and the mounting groove is formed into a fixing cavity of a transverse insulator string 14. The connecting piece can be a bolt, a through hole is formed in the clamping plate 2-2, a screw hole is formed in the vertical rod 2-1, and the bolt 2-4 penetrates through the through hole and then is in threaded connection with the screw hole. The connecting piece can also be a hook and a hanging ring, the hanging ring is hinged with the clamping plate 2-2, the hook is hinged with the vertical rod 2-1, and the hook is matched with the hanging ring to clamp and fix the transverse insulator string 14.
As shown in figure 2, two transverse rods 2-3 which are arranged along the front-back direction are fixed on the left side of a vertical rod 2-1, a connecting shaft is fixed between the two transverse rods, the axis of the connecting shaft is arranged along the front-back direction, the left end of a clamping plate 2-2 is in running fit with the connecting shaft, and the right end of the clamping plate 2-2 is fixedly connected with the vertical rod 2-1 by means of a bolt 2-4. Simple structure, easy dismounting is swift, labour saving and time saving. In order to avoid hard friction between the clamping plates and the vertical rods and the transverse insulator string 14, elastic buffer layers are fixed in the mounting grooves and on the inner walls of the clamping plates 2-2.
The longitudinal support frame 3 is a positioning column, a positioning groove is formed in the upper end of the positioning column, and the lower end of the longitudinal insulator string 15 is fixedly connected with the positioning groove in an inserting mode. The disassembly and assembly are convenient and quick, and time and labor are saved. In order to ensure that the longitudinal insulator string 15 is more firmly and reliably inserted into the positioning groove and hard friction between the longitudinal insulator string 15 and the positioning groove is avoided, an elastic buffer sleeve is arranged in the positioning groove.
As right the utility model discloses a further improvement, casing 1 includes casing and lower casing, goes up casing and the support fixed connection who sets up below it, and horizontal support frame 2, vertical support frame 3, scattered pore plate 7 and shower nozzle 4 all are located the upper casing, and the one end of lower casing is articulated with last casing, the other end forms detachable the connection with the upper casing with the help of retaining member, makes the casing have the upset degree of freedom down. Regarding the concrete structure of retaining member, the utility model discloses in give following two kinds:
First, the retaining member includes the diaphragm 11 of fixing on the outer wall of the upper housing, with lower housing articulated L shape connecting rod 12, the vertical pole of L shape connecting rod 12 pass behind the via hole of seting up on the diaphragm 11 with set up the nut threaded connection in diaphragm 11 top. Simple structure, easy dismounting is swift, labour saving and time saving. As shown in fig. 1, the locking member is located on the left side of the housing 1, and in order to facilitate the insertion and separation of the L-shaped connecting rod 12 and the transverse plate 11, the through hole in the transverse plate 11 is an oblong hole and is arranged along the left-right direction in the length direction.
And in the second type, the locking part comprises a hook fixed on the outer wall of the upper shell and a hanging ring hinged with the lower shell, and the hanging ring is matched with the hook to fixedly connect the lower shell and the upper shell.
Can produce cullet when breaking through the test article on horizontal insulator chain 14 and the vertical insulator chain 15 is whole, dismantle the retaining member, with casing downwardly rotating down, then cullet can drop automatically, and the back has been discharged to the cullet, the casing under the counter-rotating again, utilize the retaining member will be down the casing with last casing fixed together can, convenient and fast, labour saving and time saving is by the fish tail when can avoiding artifical clearance cullet moreover, the security is better.
As right the utility model discloses a further improvement is provided with the outlet in 1 bottom of casing, and the outlet is provided with drain valve 13 with the help of drainage pipe and water storage device 5's return water mouth intercommunication on the drainage pipe. The drainage pipeline is preferably a hose, water which falls to the bottom of the shell 1 after being sprayed returns to the water storage device 5 after passing through the drainage port and the drainage pipeline, the water is recycled, the waste of water resources can be reduced, the opening and the stopping of the drainage process can be controlled by using the drainage valve 13, and the drainage speed can also be adjusted.
As right the utility model discloses a further improvement, casing 1 coils along vertical direction and forms into helical structure, and horizontal support frame 2, vertical support frame 3, shower nozzle 4, scattered wind orifice plate 7 and vibration generator 8 all are located the bottom in casing 1. When a strong wind rain test is carried out, gas rises along the spiral channel in the shell 1, turbulence generated in the shell 1 can be avoided, and the measurement result is more accurate.
When the utility model is used for a breeze vibration test, the horizontal insulator chain 14 is firstly fixed on the horizontal support frame 2, the vertical insulator chain 15 is fixed on the vertical support frame 3, the insulator at the tail end of the horizontal insulator chain 14 is a test article and the rest are all test articles, the insulator at the bottom end of the vertical insulator chain 15 is a test article and the rest are all test articles; tension is formed on the insulator string through a tension mechanism, so that the insulator string is tensioned in the shell by an online operation actual stress load; manually striking to completely break the test objects on the transverse insulator strings 14 and the longitudinal insulator strings 15 (generally, a striking and breaking method is used, and attention is paid to the fact that a surface polymer layer cannot be obviously damaged); then, a tensile load of 30% of a prescribed mechanical breaking load was applied to each test piece; then, the vibration generator 8 is started to drive the vibration frequency of the vibration generator 8Adjusting to 5-50Hz to make the maximum vibration amplitude of each series of test articles reach 50mm and the vibration angle is 50 degrees (namely the included angle between the vibration direction of the vibration generator and the axial line of the transverse insulator string/the longitudinal insulator string is 50 degrees); observing the umbrella disc state of the tested product periodically after the test is started, realizing vibration reversing by using an X-axis vibration generator and a Y-axis vibration generator according to actual needs, finishing the test and recording the vibration times, if the rupture umbrella disc of the tested product passes through 3 multiplied by 106And if the amount of the glass fragments which are not dropped and are scattered and dropped by the secondary vibration is less than 2 percent, the test is passed and the product is qualified.
When a strong wind and rain test is carried out, firstly fixing the transverse insulator string 14 on the transverse support frame 2, fixing the longitudinal insulator string 15 on the longitudinal support frame 3, wherein the insulator at the tail end of the transverse insulator string 14 is an accompanying test article and the rest of the insulators are test articles, the insulator at the lower end of the longitudinal insulator string 15 is an accompanying test article and the rest of the insulators are test articles; tension is formed on the insulator string through a tension mechanism, so that the insulator string is tensioned in the shell by an online operation actual stress load; the spray head 4 is positioned 0.5-1.0m above the transverse insulator string 14 and the longitudinal insulator string 15, and manually blows to completely break the test objects on the transverse insulator string 14 and the longitudinal insulator string 15 (generally, a knocking and breaking method is used, and attention is paid to the fact that a polymer layer on the surface cannot be obviously damaged); then, a tensile load of 30% of a prescribed mechanical breaking load was applied to each test piece; then starting a spraying mechanism, under the action of a water delivery mechanism 6, spraying water in a water storage device 5 through a valve 16 and a flowmeter 17 by a spray head 4, and falling onto a transverse insulator string 14 and a longitudinal insulator string 15, wherein the rainfall is controlled to be 1-10 mm/min; and simultaneously, starting the blower 9, simulating 12-level wind by using wind speed, subjecting the transverse insulator string 14 to the wind in the following direction, subjecting the longitudinal insulator string 15 to the wind in the lateral direction perpendicular to the longitudinal insulator string, testing for 60min under the conditions of rain and strong wind, finishing the test, recording the rain amount, the wind force and the duration time, then checking the insulator, if the rupture umbrella disc of the test article still does not fall off, and the amount of the scattered and dropped glass fragments is less than 2%, the test is passed, and the product is qualified.
The utility model discloses a test device has the function that anti breeze vibration ability and anti strong wind drench rain ability to anti breaking type glass composite insulator that falls concurrently and detect, simple structure, convenient operation.
Claims (10)
1. Insulator breakage tolerance test device that drops, including insulator fixed establishment, spray the mechanism and wind-force load and the little wind vibration of simulation takes place the mechanism, its characterized in that: the insulator fixing mechanism comprises a shell (1), a transverse support frame (2) used for fixing a transverse insulator string (14) and a longitudinal support frame (3) used for fixing a longitudinal insulator string (15), wherein the transverse support frame (2) and the longitudinal support frame (3) are fixed in the shell (1); the spraying mechanism comprises a spray head (4) which is hoisted above the transverse support frame (2) and the longitudinal support frame (3), and a water delivery mechanism (6) which is connected between the spray head (4) and the water storage device (5); vibration generation mechanism is including fixing in casing (1) and air outlet towards wind orifice plate (7) that looses of horizontal support frame (2) and vertical support frame (3), simultaneously with vibration generator (8) of horizontal support frame (2) and vertical support frame (3) fixed connection, and set up air-blower (9) in casing (1) outside, the export of air-blower (9) and the access connection of the wind orifice plate (7) that looses, the periphery of vibration generator (8) is fixed with rain-proof cover, the diameter of casing (1) from top to bottom reduces in proper order.
2. the device for testing the breakage and drop resistance of the insulator according to claim 1, wherein: casing (1) inside be fixed with support horizontal pole (10), support horizontal pole (10) along the radial setting of casing (1), the bottom of horizontal support frame (2) and vertical support frame (3) all with support horizontal pole (10) fixed connection, vibration generator (8) also with support horizontal pole (10) fixed connection.
3. The insulator breakage drop tolerance testing device according to claim 2, characterized in that: the vibration generator (8) comprises an X-axis vibration generator and a Y-axis vibration generator, and the X-axis vibration generator and the Y-axis vibration generator are fixedly connected with the supporting cross rod (10).
4. The insulator breakage drop tolerance testing device according to claim 2, characterized in that: the horizontal support frame (2) comprises two vertical rods (2-1) which are symmetrically arranged, the lower ends of the vertical rods (2-1) are fixedly connected with a support cross rod (10), the upper ends of the vertical rods (2-1) are respectively provided with a clamping plate (2-2) and a mounting groove, one end of the clamping plate (2-2) is hinged to the vertical rod (2-1), the other end of the clamping plate is fixedly connected with the vertical rod (2-1) through a connecting piece, and a cavity between the clamping plate (2-2) and the mounting groove is formed into a fixed cavity of a horizontal insulator string (14).
5. The device for testing the breakage and drop resistance of the insulator according to claim 1, wherein: the longitudinal support frame (3) is a positioning column, a positioning groove is formed in the upper end of the positioning column, and the lower end of the longitudinal insulator string (15) is fixedly connected with the positioning groove in an inserting mode.
6. The device for testing the breakage and drop resistance of the insulator according to claim 1, wherein: the shell (1) comprises an upper shell and a lower shell, the upper shell is fixedly connected with a support arranged below the upper shell, the transverse support frame (2), the longitudinal support frame (3), the air dispersing pore plate (7) and the spray head (4) are all positioned in the upper shell, one end of the lower shell is hinged with the upper shell, the other end of the lower shell is detachably connected with the upper shell by virtue of a locking piece, and the lower shell has turnover freedom.
7. The device for testing the breakage and drop resistance of the insulator according to claim 6, wherein: the locking piece comprises a transverse plate (11) fixed on the outer wall of the upper shell and an L-shaped connecting rod (12) hinged with the lower shell, and a longitudinal rod of the L-shaped connecting rod (12) penetrates through a through hole formed in the transverse plate (11) and then is in threaded connection with a nut arranged above the transverse plate (11).
8. The device for testing the breakage and drop resistance of the insulator according to claim 6, wherein: the locking piece comprises a hook fixed on the outer wall of the upper shell and a hanging ring hinged with the lower shell, and the hanging ring is matched with the hook to fixedly connect the lower shell and the upper shell.
9. The device for testing the breakage and drop resistance of the insulator according to claim 1, wherein: the bottom of the shell (1) is provided with a water outlet which is communicated with a water return port of the water storage device (5) by virtue of a drainage pipeline, and the drainage pipeline is provided with a drainage valve (13).
10. The device for testing the breakage and drop resistance of the insulator according to claim 1, wherein: the shell (1) is coiled in the vertical direction to form a spiral structure, and the transverse support frame (2), the longitudinal support frame (3), the spray head (4), the air dispersing pore plate (7) and the vibration generator (8) are all positioned at the bottom in the shell (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920903503.8U CN209802622U (en) | 2019-06-17 | 2019-06-17 | Insulator crushing and falling tolerance test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920903503.8U CN209802622U (en) | 2019-06-17 | 2019-06-17 | Insulator crushing and falling tolerance test device |
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| CN209802622U true CN209802622U (en) | 2019-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113577630A (en) * | 2021-07-27 | 2021-11-02 | 国网安徽省电力有限公司电力科学研究院 | Fire extinguishing medium test device and test method for extinguishing forest fire of power transmission line |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113577630A (en) * | 2021-07-27 | 2021-11-02 | 国网安徽省电力有限公司电力科学研究院 | Fire extinguishing medium test device and test method for extinguishing forest fire of power transmission line |
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