CN109444564A - The measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field - Google Patents
The measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field Download PDFInfo
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- CN109444564A CN109444564A CN201811313453.4A CN201811313453A CN109444564A CN 109444564 A CN109444564 A CN 109444564A CN 201811313453 A CN201811313453 A CN 201811313453A CN 109444564 A CN109444564 A CN 109444564A
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- vegetation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/24—Arrangements for measuring quantities of charge
Abstract
The invention belongs to transmission line safety analysis technical fields, disclose a kind of measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field, choose typical vegetation material, top arrangement analog conducting wire electrode simultaneously applies voltage, collect and measure the carrying capacity and quality of vegetation burning particles object, and the charge-mass ratio of different-grain diameter particle is obtained by the sieve plate of different pore size, it can get the overall charging characteristic of vegetation burning particles.The present invention selects particle using different insulation sieve plate brushes, obtains the charging particle characteristic of different-grain diameter range using multiple measurement processing, is more advantageous to electric field distortion characteristic of the electrically charged particle object of analysis vegetation burning in transmission line of electricity clearance to ground；The present invention can preferably simulate vegetation combustion case under the conditions of mountain fire, and using unified typical vegetation quality and arrangement, avoid the substance that other ignition way bring burnings are uncertain or introducing is new, ensure that the equivalence and repeatability of experimental condition.
Description
Technical field
The invention belongs to vegetation under transmission line safety analysis technical field more particularly to a kind of transmission line simulation electric field
The measurement method of burning particles object carrying capacity.
Background technique
Currently, the prior art commonly used in the trade is such that
As power grid rapidly develops, power transmission line corridor growing tension, it is luxuriant that passway for transmitting electricity inevitably passes through vegetation
High risk of forest fire area, mountain fire with may cause transmission line of electricity phase and phase insulation intensity decline and trip accident occurs.According to
Statistics, China's power grid reaches hundreds of because of mountain fire trip accident in recent years, only spring in 2014, national grid 220kV Above Transmission Lines
It influenced to have 47 less urgent stoppages in transit by mountain fire, 17 brownout operations, exit reclosing 213 times, seriously affected power grid
Safe and stable operation causes huge economic losses.Particulate matter and ashes under route electric field action in flame is by flame
Ion influences and charged, and the air-flow, electric field force the effects of under enter gap below transmission line of electricity and form particle chain, make space
Simultaneously shelf depreciation occurs for electric field distortion, further results in entire gap breakdown.It is existing research shows that electrically charged particle chain distortion electric field
And generating triggering electric discharge is the key that lead to entire gap breakdown, the distortion electric field effect after charging particle greatly reinforces, therefore
The charged flow characteristic for studying vegetation burning particles is significant for the discharge mechanism in gap under the conditions of mountain fire.
The research of existing charging particle mainly have that the carbon soot particles of hydrocarbon combustion are charged, industrial dust is charged and
Sand and dust are charged etc. in dust storm.The quantity of electric charge carried using the methods of deposition test and faraday cup test measurement particle.But it is above-mentioned
Particle and vegetation burning particles have larger difference, these particle sizes are small and more uniform, and especially carbon soot particles are small-sized.
And typical transmission line of electricity vegetation flame, such as Chinese fir branches and leaves, eucalyptus branches and leaves, cogongrass nearby, it burns other than tiny carbon soot particles
There are also larger size ash particles, and the particle of variable grain magnitude range is difficult to differentiate between using the above method, cannot effectively obtain
The charging characteristic of different vegetation particles.For this purpose, the invention proposes vegetation burning particles objects under a kind of transmission line simulation electric field
The measurement method of carrying capacity.
In conclusion problem of the existing technology is:
(1) existing charging particle in the related technology to under the influence of electric field flame carbon soot particles concentration variation divide
Analysis, but this kind of research carries out in closed burner or closed dedusting space, burning particles and dedusting grain diameter very little and more
Uniformly.And vegetation flame is different since branches and leaves burn, and there is the problems such as burning is random insufficient, granulometric range changes greatly,
Above-mentioned technology is such as used, the charging characteristic of different-grain diameter particle cannot be effectively obtained, it is difficult to which effectively analysis particle triggering electric discharge is special
Property, this patent can effectively distinguish the charging particle characteristic of different-grain diameter range.In the prior art, it is difficult to it is big to distinguish variable grain
Small-scale particle cannot effectively obtain the charging characteristic of different vegetation particles.
(2) existing simulation mountain fire causes the experimental study platform of transmission line of electricity gap discharge, mostly studies the electric discharge in gap
Voltage and leakage current, and the measurement lacked to charging particle amount is tested.Only by analogue simulation, shortage is tested for majority research
Card.
(3) charged for similar sandy environment and electrostatic precipitation particle situation, charged for sandy environment is due to sand
Collision causes between dirt, and testing the corresponding high-field electrode for applying different voltages form with this has essential distinction.Electrostatic precipitation is
It is discharged by eletrode tip and generates charge, be adsorbed on dust granule in charge anisotropy pole plate motion process, particle lotus
Electric collecting is not suitable for the mountain fire situation below transmission line of electricity.And this patent is directed to move in vegetation flame bulk plasmon
Ash particles it is charged, the charged of the two has an essential distinction, and the analog conducting wire electrode of this patent setting can effectively simulate transmission of electricity
The electric field conditions that route generates, simulation particle is charged under flame body and analog conducting wire electrode generation electric field collective effect, and
The case where different height charging particle can effectively be collected.
Solve the difficulty and meaning of above-mentioned technical problem:
Since the particulate matter that the burning of different vegetation generates has different, first have to determine different vegetation burning particles sizes
The statistical law of shape divides different vegetation according to statistical law and burns if there are granule number peak values for some particle size range
The particle size range for generating particulate matter, is arranged corresponding window screen size, could more effectively carry out charging particle characteristic in this way
Research.This is also the unvanquishable difficulty of the prior art.
Vegetation burning particles are charged under flame plasma and analog conducting wire electrode collective effect, generate from particle to mould
Carrying capacity is a change procedure during quasi- electrode movement, and how to analyze is a difficult point.
Meaning: the present invention can easily collect the particle in different height section, study charged situation.
The charging characteristic of mountain fire particle in gap below transmission line of electricity is obtained by the studies above, for transmission line of electricity because of mountain
The research of fire tripping mechanism is of great significance, and then can instruct to formulate the control measure that transmission line of electricity trips by mountain fire, can
Ensure the safe and stable operation of transmission line of electricity.
Summary of the invention
In view of the problems of the existing technology, the present invention provides vegetation burning particles under a kind of transmission line simulation electric field
The measurement method of object carrying capacity.
The invention is realized in this way under a kind of transmission line simulation electric field vegetation burning particles object carrying capacity measurement side
Method, the measurement method of vegetation burning particles object carrying capacity includes: to choose typical vegetation material under the transmission line simulation electric field,
Top arrangement analog conducting wire electrode simultaneously applies voltage, collects and measure the carrying capacity and quality of vegetation burning particles object, and pass through
The sieve plate of different pore size obtains the charge-mass ratio of different-grain diameter particle, obtains the overall charging characteristic of vegetation burning particles.
Further, the measurement method of vegetation burning particles object carrying capacity specifically includes under the transmission line simulation electric field:
Step 1: choosing typical vegetation material, weigh the planting materials of N parts of phase homogenous quantities；
Step 2: arranging planting materials on burning platform, test is arranged to identical structure size every time, on vegetation
Analog conducting wire electrode is arranged at the high H in side and applies voltage V；
Step 3: lighting vegetation, vegetation particle is collected by particle collection device, burning platform uses Resistant heating point
Combustion mode generates different initial combustion intensity by changing Resistant heating power analog；
Step 4: the vegetation burning particles ashes of collection being analyzed, the particle size statistics rule of vegetation burning are obtained
Rule；
Step 5: according to vegetation burning particles size statistics rule, select the insulation sieve plate of K kind specification, plurality of specifications it is exhausted
Edge sieve plate hole is sequentially increased, and the sieve plate shape that insulate passes through various sizes of ash particles according to vegetation particle characteristics；
Step 6: taking a planting materials to arrange by identical structure, apply voltage, the insulation sieve plate for choosing minimum-value aperture is put
It sets before powder collection measuring device, collection floats the electrically charged particle being raised between flame body and simulation electrode, measures and is collected into
Granular mass M1With quantity of electric charge Q1；
Step 7: successively selecting bigger insulation sieve plate, tested by step 6, measurement obtains granular mass MnAnd electricity
Lotus amount Qn；
Step 8: calculating the particle charge-mass ratio for being less than minimum grain size size using Q1/M1, utilize (Qn-Qn-1)/(Mn-Mn-1)
The charge-mass ratio of particle in different-grain diameter range is obtained, n >=2 obtain the overall charging characteristic of vegetation burning particles；
Step 9: change burning vegetation type, changes application voltage value, changes combustion the height for changing electrode spacing burning vegetation
Intensity is burnt, under different operating conditions, step 1~step 8 is repeated, analyzes the charged spy of totality of vegetation burning particles under different condition
Property.
Further, in step 2, applying voltage is alternating current and direct current positive polarity or direct current reverse voltage.
Further, in step 4, molecule is measured using particle size analyzer；Vernier caliper measurement large-size particle.
Further, in step 7, when measuring full-size particle, sieve plate is not added, directly collects.
Further, in step 8, by blower and baffle fit, the vegetation particle of different height is collected, different height is obtained
The charging characteristic of vegetation particle.
In conclusion advantages of the present invention and good effect are as follows:
The present invention can be directed to the characteristics of different types vegetation burning particles ashes, using different insulation sieve plate brush choosings
Grain, obtains the charging particle characteristic of different-grain diameter range using multiple measurement processing, is more advantageous to the charged of analysis vegetation burning
Electric field distortion characteristic of the particulate matter in transmission line of electricity clearance to ground；
And electrostatic precipitation particle situation charged for similar sandy environment, it is charged for sandy environment be due to sand and dust it
Between collide and cause, testing corresponding high-field electrode for applying different voltages form with this has essential distinction.Electrostatic precipitation is to pass through
Eletrode tip electric discharge generates charge, is adsorbed on dust granule in charge anisotropy pole plate motion process, and charging particle is received
Collection is not suitable for the mountain fire situation below transmission line of electricity.And this patent is directed to the ashes moved in flame bulk plasmon
Grain is charged, and the charged of the two has essential distinction, and the analog conducting wire electrode of this patent setting can effectively transmission line simulation generate
Electric field conditions, simulation particle generates charged under electric field collective effect in flame body and analog conducting wire electrode, and can effectively receive
The case where collecting different height charging particle
The present invention can preferably simulate vegetation combustion case under the conditions of mountain fire, and using unified typical vegetation quality and arrangement
Mode, and variable power Resistant heating is used as ignition method, it is not true to avoid other ignition way bring burnings
Substance qualitative or that introducing is new, ensure that the equivalence and repeatability of experimental condition.
Vegetation burning particles are charged under flame plasma and analog conducting wire electrode collective effect, generate from particle to mould
Carrying capacity is a change procedure during quasi- electrode movement, and how to analyze is a difficult point, can easily be received using this method
The particle for collecting different height section, studies charged situation
Detailed description of the invention
Fig. 1 is the measurement side of vegetation burning particles object carrying capacity under transmission line simulation electric field provided in an embodiment of the present invention
Method flow chart.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
In the prior art, it is difficult to distinguish the particle of variable grain magnitude range, cannot effectively obtain different vegetation particles
Charging characteristic.
The present invention provides a kind of measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field, chooses allusion quotation
Type planting materials, top arrangement analog conducting wire electrode simultaneously apply voltage, collect and measure vegetation burning particles object carrying capacity and
Quality, and the charge-mass ratio of different-grain diameter particle is obtained by the sieve plate of different pore size, it can get the overall lotus of vegetation burning particles
Electrical characteristics；
Application of the invention is further described below with reference to concrete analysis.
Such as Fig. 1, the measurement of vegetation burning particles object carrying capacity under transmission line simulation electric field provided in an embodiment of the present invention
Method, comprising the following steps:
Step 1: choosing typical vegetation material, weigh the planting materials of N parts of phase homogenous quantities；
Step 2: arranging planting materials on burning platform, test is arranged to identical structure size every time, on vegetation
Analog conducting wire electrode is arranged at the high H in side and applies voltage V；Further, applying voltage can be alternating current and direct current positive polarity or straight
Flow reverse voltage；
Step 3: lighting vegetation, vegetation particle is collected by particle collection device, wherein burning platform is added using resistance wire
Hot ignition way, the repeatability of guarantee test, while heating power is controllable, analog generates different initial combustion intensity；
Step 4: the vegetation burning particles ashes of collection being analyzed, measure molecule using particle size analyzer；Trip
Mark calliper to measure large-size particle；Obtain the particle size statistical law of vegetation burning；
Step 5: according to vegetation burning particles size statistics rule, select the insulation sieve plate of K kind specification, plurality of specifications it is exhausted
Edge sieve plate hole is sequentially increased, and shape is designed according to vegetation particle characteristics, can guarantee that various sizes of ash particles pass through；
Step 6: taking a planting materials to arrange by identical structure, apply voltage, first the insulation sieve of selection minimum-value aperture
Before plate is placed on powder collection measuring device, the electrically charged particle being raised between flame body and simulation electrode that floats is collected, measurement is collected
The granular mass M arrived1With quantity of electric charge Q1；
Step 7: successively selecting bigger insulation sieve plate, tested by step 6, measurement obtains granular mass MnAnd electricity
Lotus amount Qn；Further, sieve plate can also be no longer added when full-size particle to be measured, is directly collected；
Step 8: can calculate to be less than the particle charge-mass ratio of minimum grain size size using Q1/M1, utilize (Qn-Qn-1)/(Mn-
Mn-1) charge-mass ratio (n >=2) of particle in available different-grain diameter range, thus the charged spy of the totality for obtaining vegetation burning particles
Property；Further, the vegetation particle that by blower and baffle fit, can collect different height, can be obtained different height vegetation
The charging characteristic of grain；
Step 9: change burning vegetation type, changes application voltage value, changes combustion the height for changing electrode spacing burning vegetation
Intensity (changing burning quality and Resistant heating power) is burnt to repeat step 1~8 under different operating conditions, different items can be analyzed
The overall charging characteristic of vegetation burning particles under part.
Application of the invention is further described combined with specific embodiments below.
Embodiment:
This example is said for the carrying capacity measurement in transmission line simulation electric field by Chinese fir twig burning particles object
It is bright, it should be understood that preferred embodiments described herein are only used to illustrate and explain the present invention, is not intended to limit the present invention.
Step 1: choosing Chinese fir twig as combustible substance, weigh the Chinese fir twig that 7 parts of quality are 100g；
Step 2: arranging Chinese fir twig on burning platform, the square mesa-shaped of 21cm × 21cm × 10cm is arranged as, in vegetation
Analog conducting wire electrode is arranged at the high 80cm in top and applies direct-flow positive voltage 50kV；
Step 3: by the Resistant heating on burning platform, power 2kW being set, lights vegetation, is filled by powder collection
It sets and collects vegetation particle；
Step 4: the vegetation burning particles ashes of collection are analyzed, measure molecule using particle size analyzer, this
Class particle naked eyes can not be differentiated, and can analyze different-grain diameter content with particle size analyzer；Vernier caliper measurement large-size particle, Chinese fir
The maximum ash particles of branch are 7cm strip；Obtain the particle size statistical law of vegetation burning；
Step 5: according to vegetation burning particles size statistic rule, selecting the insulation sieve plate of 5 kinds of specifications, respectively aperture
1mm, 5mm, 1cm, 2cm, 4cm do not need sieve plate when measuring larger size particle；
Step 6: taking 100g Chinese fir twig, apply voltage, the insulation sieve plate for choosing minimum-value aperture 1mm is placed on powder collection survey
Before measuring device, the electrically charged particle being raised between flame body and simulation electrode that floats is collected, is collected into using weight sensor measurement
Granular mass M1, total quantity of electric charge Q is measured using Faraday cup1；
Step 7: successively selecting bigger insulation sieve plate, tested by step 6, measurement obtains corresponding granular mass
MnWith quantity of electric charge Qn；After finally removing sieve plate, the granular mass M that measures6With quantity of electric charge Q6；
Step 8: utilizing Q1/M1The particle charge-mass ratio that 1mm can be calculated to be less than, utilizes (Qn-Qn-1)/(Mn-Mn-1) can obtain
The charge-mass ratio (n >=2) of particle into different-grain diameter range, to obtain Chinese fir twig vegetation burning particles under existing experimental condition
Overall charging characteristic.By blower and baffle fit, 40~50cm section, 50~60cm section, the area 60~70cm are collected respectively
Section, the charging characteristic of the particle of 70~80cm section.
Step 9: change and apply voltage value, direct current negative polarity 50kV is changed to by straight polarity 50kV, repeats step 1~8,
The overall charging characteristic that direct current negative polarity 50kV voltage acts on lower Chinese fir twig burning particles can be obtained.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. the measurement method of vegetation burning particles object carrying capacity under a kind of transmission line simulation electric field, which is characterized in that the mould
The measurement method of vegetation burning particles object carrying capacity includes: to choose typical vegetation material under quasi- transmission line of electricity electric field, top arrangement
Analog conducting wire electrode simultaneously applies voltage, collects and measure the carrying capacity and quality of vegetation burning particles object, and passes through different pore size
Sieve plate obtain the charge-mass ratio of different-grain diameter particle, obtain the overall charging characteristic of vegetation burning particles.
2. the measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field as described in claim 1, special
Sign is that the measurement method of vegetation burning particles object carrying capacity specifically includes under the transmission line simulation electric field:
Step 1: choosing typical vegetation material, weigh the planting materials of N parts of phase homogenous quantities；
Step 2: arranging planting materials on burning platform, test is arranged to identical structure size every time, the high H above vegetation
Place's arrangement analog conducting wire electrode simultaneously applies voltage V；
Step 3: lighting vegetation, vegetation particle is collected by particle collection device, burning platform uses the Resistant heating side of lighting
Formula generates different initial combustion intensity by changing Resistant heating power analog；
Step 4: the vegetation burning particles ashes of collection being analyzed, the particle size statistical law of vegetation burning is obtained；
Step 5: according to vegetation burning particles size statistic rule, selecting the insulation sieve plate of K kind specification, the insulation sieve of plurality of specifications
Plate hole gap is sequentially increased, and the sieve plate shape that insulate passes through various sizes of ash particles according to vegetation particle characteristics；
Step 6: taking a planting materials to arrange by identical structure, apply voltage, the insulation sieve plate for choosing minimum-value aperture is placed on
Before powder collection measuring device, the electrically charged particle being raised between flame body and simulation electrode that floats is collected, the particle being collected into is measured
Mass M1With quantity of electric charge Q1；
Step 7: successively selecting bigger insulation sieve plate, tested by step 6, measurement obtains granular mass MnAnd the quantity of electric charge
Qn；
Step 8: calculating the particle charge-mass ratio for being less than minimum grain size size using Q1/M1, utilize (Qn-Qn-1)/(Mn-Mn-1) obtain
The charge-mass ratio of particle, n >=2 in different-grain diameter range obtain the overall charging characteristic of vegetation burning particles；
Step 9: changing burning vegetation type, the height for changing electrode spacing burning vegetation, change and apply that voltage value, to change burning strong
Degree repeats step 1~step 8 under different operating conditions, analyzes the overall charging characteristic of vegetation burning particles under different condition.
3. the measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field as claimed in claim 2, special
Sign is, in step 2, applying voltage is alternating current and direct current positive polarity or direct current reverse voltage.
4. the measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field as claimed in claim 2, special
Sign is, in step 4, measures molecule using particle size analyzer；Vernier caliper measurement large-size particle.
5. the measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field as claimed in claim 2, special
Sign is, in step 7, when measuring full-size particle, sieve plate is not added, directly collects.
6. the measurement method of vegetation burning particles object carrying capacity under transmission line simulation electric field as claimed in claim 2, special
Sign is, in step 8, by blower and baffle fit, collects the vegetation particle of different height, obtains different height vegetation particle
Charging characteristic.
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