CN104614484A - Platform for testing combustion characteristics of typical vegetations in power transmission line corridor - Google Patents
Platform for testing combustion characteristics of typical vegetations in power transmission line corridor Download PDFInfo
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- CN104614484A CN104614484A CN201510063093.7A CN201510063093A CN104614484A CN 104614484 A CN104614484 A CN 104614484A CN 201510063093 A CN201510063093 A CN 201510063093A CN 104614484 A CN104614484 A CN 104614484A
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Abstract
The invention discloses a platform for testing the combustion characteristics of typical vegetations in a power transmission line corridor; the combustion characteristics of typical vegetation combustibles capable of enabling a power transmission line to be tripped are obtained; and data support is provided for analyzing a clearance breakdown mechanism under forest fire conditions. The platform is composed of the combustibles, an iron plate, a thermal insulation plate, a weight sensor, a mass display instrument, a thermocouple array, a thermocouple bracket, a transmission line, a temperature display instrument, a scaleplate, a DV camera, two electrodes, an insulation resistance tester and a conductor wire. According to the platform, combustion characteristic tests of the different vegetation combustibles can be conveniently carried out; the combustion characteristic quantities in the combustion process of the vegetations, such as flame height, flame temperature, fire intensity and flame resistance, are obtained; the data support can be provided for simulating a clearance discharging test under the forest fire conditions; and the platform is simple to operate and high in reliability.
Description
Technical field
The invention belongs to electrical engineering technical field, particularly a kind of power transmission line corridor typical vegetation combustion characteristic research platform.
Background technology
In recent years along with the expansion of electrical network scale, through mountain area, the transmission line of electricity in forest zone constantly increases, and the mountain fire that near line corridor, villager burns the grass on waste land, the behavior such as sacrifice causes also increasingly sharpens to the threat that transmission line of electricity safe and stable operation causes.Mountain fire is a kind of high temperature, heterogeneous weak plasma containing different-grain diameter solid and liquid particles, and mountain fire intermediate gap discharge mechanism is more complicated than aerial discharge, relates to the combined action of the various factors such as temperature, conductivity, particle and ashes.Flame high temperature makes atmospheric density decline, and electron mean free path increases, and correspondingly reduces the field intensity required for streamer development; The free charged particle generated of inorganic salts heat under flame high temperature action in the chemical reaction occurred during vegetation burning and vegetation, flame conductivity is significantly raised, be beneficial to the development of streamer, simultaneously, the particle that vegetation burning produces and ashes triggering discharges, distortion electric field, causes gap to be easier to puncture; The combined action of above factor, causes transmission line of electricity to be easy to trip accident occurs under mountain fire condition.And the chemical composition of these factors and vegetation itself and combustion characteristic closely related, the combustion characteristics therefore studying power transmission line corridor vegetation plays an important role to gap breakdown mechanism under analysis mountain fire condition.
Summary of the invention
The object of the invention is to for existing technical matters, design a kind of power transmission line corridor typical vegetation combustion characteristic research platform, experimental study is carried out for the vegetation easily causing mountain fire trip accident, obtain the combustion characteristics of vegetation combustible, for the gap breakdown mechanism analyzed under mountain fire condition provides data supporting.
The technical solution adopted in the present invention is: a kind of power transmission line corridor typical vegetation combustion characteristic research platform, obtains the combustion characteristics of the typical vegetation combustible causing transmission line of electricity tripping operation, for the gap breakdown mechanism analyzed under mountain fire condition provides data supporting; It is characterized in that: be made up of combustible, iron plate, heat-insulating shield, weight sensor, quality Displaying Meter, thermopair battle array, thermocouple support, transmission line, temperature display meter, scale, DV camera, two electrodes, Insulation Resistance Tester and wires; Described combustible is placed on described iron plate, and described weight sensor is arranged on described iron plate lower bottom part, for monitoring the change of combustible weight, and then the size of reflection intensity of a fire intensity; Heat-insulating shield is provided with, for the protection of weight sensor between described iron plate and weight sensor; Described DV camera is arranged on combustible side, for recording the combustion process of combustible, and observes the generation of ashes and smog; Described scale is arranged on combustible opposite side, for recording flame height; Described thermocouple arrays is arranged on combustible axis, and for measuring the temperature of flame body, described thermocouple support is used for fixing thermocouple arrays; Described transmission line one end is connected with described thermocouple arrays, the other end and described temperature indicator list catenation, for the temperature signal of heat outputting galvanic couple battle array, and by described temperature display meter display flame temperature; Described quality Displaying Meter is connected with described weight sensor, for gathering the situation of change of weight in combustible combustion process; Two described electrode runs parallel are arranged in above iron plate, are positioned over combustible flame inner, the high pressure of described Insulation Resistance Tester, low pressure end respectively through wire and Electrode connection, for measuring the insulation resistance of flame.
As preferably, described DV camera model is Sony HDR-CX580E, can make a video recording continuously more than one hour.
As preferably, the thermopair of described thermocouple arrays adopts armoured thermocouple, and model is WRNK-191, and temperature measurement range is 0 ~ 1100 DEG C, and the spacing of thermocouple arrays can freely adjust, and bottom thermopair is 18cm apart from the distance of iron plate.
As preferably, the height of described thermocouple support is 1m.
As preferably, the height of described scale is 1m, and minimum scale is 1cm.
As preferably, the thickness of described heat-insulating shield is 20mm.
As preferably, the size of described iron plate is 50 × 50 × 1cm
3, described combustible is square buttress, is of a size of 21 × 21 × 10cm
3.
As preferably, described electrode size is 6 × 6cm
2, described Insulation Resistance Tester can be measured M Ω and above resistance.
As preferably, described weight sensor is S type pressure transducer, and range is 0 ~ 50kg, and measuring accuracy is 1g, and its output voltage is 0 ~ 10V; Described temperature display meter, quality Displaying Meter are digital display meter, can the change of displays temperature and quality in real time.
A kind of power transmission line corridor vegetation combustion characteristic research platform that the present invention proposes, can obtain the flame temperature of differ ent vegetation, highly, the combustion characteristic amount such as conductivity, for the tripping operation mechanism of transmission line of electricity under mountain fire condition and mountain fire prophylactico-therapeutic measures research provide data supporting.The invention has the beneficial effects as follows:
1) this platform operations is simple, easy to use;
2) this platform is used can to carry out the contrast test of the combustion characteristics of various combustible;
3) utilize this platform to carry out test, the combustion characteristics such as flame height, flame temperature, flame conductivity, intensity of a fire intensity, ashes amount of smoke can be obtained reliably;
4) utilize this platform to carry out combustible combustion attribute testing, can be the breakdown characteristics test in gap under simulation mountain fire condition and provide useful data, the mechanism tripped because of mountain fire for research transmission line of electricity is offered help.
Accompanying drawing explanation
Fig. 1: be the test platform schematic diagram of the embodiment of the present invention.
Fig. 2: be the arrangenent diagram of the insulation resistance of the measurement flame of the embodiment of the present invention.
Fig. 3: be the flame height variation diagram of the embodiment of the present invention.
Fig. 4: be the flame temperature variation diagram of the embodiment of the present invention.
Fig. 5: be the combustible mass variation diagram of the embodiment of the present invention.
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with drawings and Examples, the present invention is described in further detail, should be appreciated that exemplifying embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Refer to Fig. 1 and Fig. 2, a kind of power transmission line corridor typical vegetation combustion characteristic research platform provided by the invention, obtain the combustion characteristics of the typical vegetation combustible causing transmission line of electricity tripping operation, for the gap breakdown mechanism analyzed under mountain fire condition provides data supporting; Be made up of combustible 1, iron plate 2, heat-insulating shield 3, weight sensor 4, quality Displaying Meter 5, thermopair battle array 6, thermocouple support 7, transmission line 8, temperature display meter 9, scale 10, DV camera 11, two electrodes 12, Insulation Resistance Tester 13 and wires 14; Combustible 1 is placed on iron plate 2, and weight sensor 4 is arranged on iron plate 2 lower bottom part, for monitoring the change of combustible 1 weight, and then the size of reflection intensity of a fire intensity; Heat-insulating shield 3 is provided with, for the protection of weight sensor 4 between iron plate 2 and weight sensor 4; DV camera 11 is arranged on combustible 1 side, for recording the combustion process of combustible 1, and observes the generation of combustion process ashes and smog; Scale 10 is arranged on combustible 1 opposite side, for recording flame height; Thermocouple arrays 6 is arranged on combustible 1 axis, and for measuring the temperature of flame body, thermocouple support 7 is for fixing thermocouple arrays 6; Transmission line 8 one end is connected with thermocouple arrays 6, the other end is connected with temperature display meter 9, for the temperature signal of heat outputting galvanic couple battle array 6, and shows flame temperature by temperature display meter 9; Quality Displaying Meter 5 is connected with weight sensor 4, for gathering the situation of change of weight in combustible 1 combustion process; Two electrodes 12 are arranged in parallel above iron plate 2, and be positioned over combustible 1 flame inner, high pressure, the low pressure end of Insulation Resistance Tester 13 are connected with electrode 12 through wire 14 respectively, for measuring the insulation resistance of flame.
DV camera 11 model of the present embodiment is Sony HDR-CX580E, can make a video recording continuously more than one hour; The thermopair of thermocouple arrays 6 adopts armoured thermocouple, and model is WRNK-191, and temperature measurement range is 0 ~ 1100 DEG C, and the distance of thermocouple arrays distance iron plate 2 is from top to bottom respectively: 57,47,37,26,18cm; The height of thermocouple support 7 is 1m; The height of scale 10 is 1m, and minimum scale is 1cm; The thickness of heat-insulating shield 3 is 20mm; The size of iron plate 2 is 50 × 50 × 1cm
3, combustible 1 is the square buttress of Chinese fir, is of a size of 21 × 21 × 10cm
3; Electrode 12 is of a size of 6 × 6cm
2, Insulation Resistance Tester 13 can be measured M Ω and above resistance; Weight sensor 4 is S type pressure transducer, and range is 0 ~ 50kg, and measuring accuracy is 1g, and its output voltage is 0 ~ 10V; Temperature display meter 9, quality Displaying Meter 5 are digital display meter, can the change of displays temperature and quality in real time.
The DV camera 11 of the present embodiment is positioned over experiment porch side, and scale 10 is placed on opposite side, all leaves safe enough distance with iron plate 2, and both are respectively used to the change of monitoring and recording combustible combustion situation and flame height; The measuring junction of thermocouple arrays 6 is positioned on combustible axis, and the other end is then fixed in thermocouple support 7, the output terminal of thermocouple arrays 6 through transmission line 8 cut-in temperature Displaying Meter 9, for showing the temperature variation of flame body; Combustible 1 is positioned over the centre of iron plate 2, weight sensor 4 is positioned at below iron plate 2, separates between the two with heat-insulating shield 3, the output terminal cut-in quality Displaying Meter 5 of weight sensor 4, for gathering the situation of change of quality in combustible combustion process, and then the size of reflection intensity of a fire intensity; Two electrodes 12 are arranged in parallel above iron plate 2, and spacing is 15cm, and electrode lower end is 12cm apart from the distance of iron plate 2, and electrode and thermocouple arrays 6 reserve enough insulation distances; High-pressure side, the low pressure end of Insulation Resistance Tester 13 are connected with electrode 12 respectively by wire 14, and it is inner that electrode 12 is placed in parallel in combustible 1 flame, for measuring the insulation resistance of flame.Every 1 minute record flame temperature, flame height, a flame resistance in the present embodiment.By recording flame temperature, flame height, flame resistance variations, being obtained particle and the ashes characteristic of combustible combustion process simultaneously by DV camera, the combustion characteristics of power transmission line corridor combustible can be described comparatively all sidedly.
Principle of work of the present invention is: Chinese fir grillage 1 is placed on iron plate 2 centre, and weight sensor 4 is positioned at below iron plate 2, separates between the two with heat-insulating shield 3; The position of adjustment thermocouple support 7, is made thermocouple arrays 6 be positioned on the axis of grillage, thermocouple arrays 6 is connected by transmission line 8 with temperature display meter 9 simultaneously; Electrode 12 is positioned over above combustible 1 also fixing, is connected with Insulation Resistance Tester 13 by wire 14; Light Chinese fir grillage, after grillage flame blazes up, open DV camera 11, adjust camera angle; Open temp Displaying Meter 9, weight sensor 4, quality Displaying Meter 5 and Insulation Resistance Tester 13; Every 1min in combustion process, according to the situation of flame envelope thermocouple arrays 6 and the scale of scale 10, the numeral of record flame height and temperature display meter 9; Open Insulation Resistance Tester 13, measure and record the insulation resistance size of flame.Wherein: utilize DV camera 11 to observe combustible combustion process particle and ashes situation; Scale 10 is utilized to observe the change of flame height; Utilize the temperature variation of thermocouple arrays 6 and temperature display meter 9 Fire Monitoring flame body; Weight sensor 4 and quality Displaying Meter 5 is utilized to monitor combustible mass change, and then the size of reflection intensity of a fire intensity; Insulation Resistance Tester 13 is utilized to measure flame bulk resistor, the conductivity of reflection flame;
The experimental data of the present embodiment is as follows:
Flame height change is see Fig. 3, and flame height is parabolically rule change in time; The maximum height of Chinese fir grillage flame is 60cm; In 4 ~ 7min, flame height is higher, and the intensity of a fire is violent, flameholding.
Flame temperature change is see Fig. 4, and flame temperature is also parabolically rule change in time; The maximum temperature of grillage flame is 765 DEG C; In 4 ~ 7min, flame combustion is comparatively stable, and the intensity of a fire is violent, and flame temperature is higher.
Combustible mass change curve is see Fig. 5, and at burning initial period, intensity of a fire intensity is lower, and grillage mass change is slower; 4 ~ 7min, the i.e. intensity of a fire maximum stage, flame combustion is the most violent, and grillage mass loss change is the fastest; At burning latter end, burning degree reduces rapidly, and flame height declines, and flame temperature reduces, and grillage mass loss rate reduces.
The change of flame insulation resistance is see table 1, and in the burning starting stage, flame height is lower, and flame insulation resistance is comparatively large and be G Ω level; In the intensity of a fire maximum stage, flame height is the highest, and flame temperature is maximum, chemi-ionization and the free charged particle produced of heat more, flame conductivity is comparatively large, and flame insulation resistance is minimum and be M Ω level; And at burning latter end, flame height declines rapidly, and flame temperature also decreases, and flame resistance increases rapidly.
Table 1 flame insulation resistance change list
| Flame height/cm | 10 | 20 | 30 | 40 | 50 | 60 |
| Flame resistance/M Ω | 3500 | 2000 | 1000 | 10 | 5 | 2 |
The combustible combustion attribute testing platform of the present invention's design, respond well after tested.This platform can carry out the contrast test of different combustible combustion characteristic easily, and simple to operate, application is strong.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that the claims in the present invention protect; can also make and replacing or distortion, all fall within protection scope of the present invention, request protection domain of the present invention should be as the criterion with claims.
Claims (9)
1. a power transmission line corridor typical vegetation combustion characteristic research platform, obtains the combustion characteristics of the typical vegetation combustible causing transmission line of electricity tripping operation, for the gap breakdown mechanism analyzed under mountain fire condition provides data supporting; It is characterized in that: be made up of combustible (1), iron plate (2), heat-insulating shield (3), weight sensor (4), quality Displaying Meter (5), thermopair battle array (6), thermocouple support (7), transmission line (8), temperature display meter (9), scale (10), DV camera (11), two electrodes (12), Insulation Resistance Tester (13) and wires (14);
Described combustible (1) is placed on described iron plate (2), and described weight sensor (4) is arranged on described iron plate (2) lower bottom part, for monitoring the change of combustible (1) weight, and then the size of reflection intensity of a fire intensity;
Heat-insulating shield (3) is provided with, for the protection of weight sensor (4) between described iron plate (2) and weight sensor (4);
Described DV camera (11) is arranged on combustible (1) side, for recording the combustion process of combustible (1), and observes the generation of combustion process ashes and smog; Described scale (10) is arranged on combustible (1) opposite side, for recording flame height;
Described thermocouple arrays (6) is arranged on combustible (1) axis, and for measuring the temperature of flame body, described thermocouple support (7) is for fixing thermocouple arrays (6);
Described transmission line (8) one end is connected with described thermocouple arrays (6), the other end is connected with described temperature display meter (9), for the temperature signal of heat outputting galvanic couple battle array (6), and by described temperature display meter (9) display flame temperature;
Described quality Displaying Meter (5) is connected with described weight sensor (4), for gathering the situation of change of weight in combustible (1) combustion process;
Two described electrodes (12) are arranged in parallel in iron plate (2) top, be positioned over combustible (1) flame inner, high pressure, the low pressure end of described Insulation Resistance Tester (13) are connected with electrode (12) through wire (14), respectively for measuring the insulation resistance of flame.
2. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, is characterized in that: described DV camera (11) model is Sony HDR-CX580E, can make a video recording continuously more than one hour.
3. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, it is characterized in that: the thermopair of described thermocouple arrays (6) adopts armoured thermocouple, model is WRNK-191, temperature measurement range is 0 ~ 1100 DEG C, the spacing of thermocouple arrays can freely adjust, and bottom thermopair is 18cm apart from the distance of iron plate (2).
4. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, is characterized in that: the height of described thermocouple support (7) is 1m.
5. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, is characterized in that: the height of described scale (10) is 1m, and minimum scale is 1cm.
6. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, is characterized in that: the thickness of described heat-insulating shield (3) is 20mm.
7. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, is characterized in that: the size of described iron plate (2) is 50 × 50 × 1cm
3, described combustible (1) is square buttress, is of a size of 21 × 21 × 10cm
3.
8. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, is characterized in that: described electrode (12) is of a size of 6 × 6cm
2, described Insulation Resistance Tester (13) can carry out continuous coverage to M Ω and above resistance.
9. power transmission line corridor typical vegetation combustion characteristic research platform according to claim 1, is characterized in that: described weight sensor (4) is S type pressure transducer, and range is 0 ~ 50kg, and measuring accuracy is 1g, and its output voltage is 0 ~ 10V; Described temperature display meter (9), quality Displaying Meter (5) are digital display meter, can the change of displays temperature and quality in real time.
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| CN104880532A (en) * | 2015-06-02 | 2015-09-02 | 国家电网公司 | Comparative test system of fire extinguishing performance of water additive agent for firefighting and using method of comparative test system |
| CN105021918A (en) * | 2015-06-29 | 2015-11-04 | 国家电网公司 | Power transmission line mountain fire trip test platform fire source test system |
| CN105606648A (en) * | 2016-03-07 | 2016-05-25 | 公安部四川消防研究所 | Portable fire disaster test heat release rate measuring device |
| CN106980712A (en) * | 2017-03-06 | 2017-07-25 | 三峡大学 | Transmission line of electricity clearance space total electric field computational methods under the conditions of a kind of mountain fire |
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| CN109239549A (en) * | 2018-08-31 | 2019-01-18 | 国网湖南省电力有限公司 | The experimental rig and application method of transmission line of electricity and mountain fire interaction can be decoupled |
| CN109444564A (en) * | 2018-11-06 | 2019-03-08 | 三峡大学 | The measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field |
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Inventor after: Huang Daochun Inventor after: Li Peng Inventor after: Ruan Jiangjun Inventor after: Wei Han Inventor after: Qin Zhihang Inventor after: Long Mingyang Inventor after: Zhang Yafei Inventor after: Pu Ziheng Inventor before: Li Peng Inventor before: Huang Daochun Inventor before: Ruan Jiangjun Inventor before: Wei Han Inventor before: Qin Zhihang Inventor before: Long Mingyang Inventor before: Zhang Yafei Inventor before: Pu Ziheng |
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