CN109767886A - The anti-lightning strike broken string of 10kV insulated conductor determines method with protective device and mounting distance - Google Patents
The anti-lightning strike broken string of 10kV insulated conductor determines method with protective device and mounting distance Download PDFInfo
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Abstract
The invention discloses a kind of anti-lightning strike broken strings of 10kV insulated conductor to determine method with protective device and mounting distance.The device includes: insulator, non-piercing formula high-field electrode and arrester, insulator suspension is installed on 10kV suspended insulated guide wire, arrester is connected and is fixed by the ground terminal of bracket and insulator, non-piercing formula high-field electrode is fixedly mounted on suspended insulated guide wire and keeps mounting distance L with insulator axis, and the ontology high-voltage end and non-piercing formula high-field electrode of arrester are connected directly.The mounting distance determines that method considers the uncertainty of spark location, devises installation section and best position.The present invention can effectively block short circuiting arc, play the role of anti-lightning strike broken string, while not causing to damage to suspended insulated guide wire, avoid suspended insulated guide wire that line-outage contingency occurs.
Description
Technical field
The present invention relates to lightning protection device more particularly to 10kV insulated conductor anti-lightning strike broken string protective device and installations
Distance determines method.
Background technique
Currently, mostly using suspended insulated guide wire to carry out electrical energy transportation 10kV distribution line to improve power supply reliability.So
And Broken of Overhead Insulation Lines By Lightning problem is very prominent.10kV Broken of Overhead Insulation Lines By Lightning in order to prevent is based on principle
Different there are " leading-type " and " blocking type " two kinds of protective devices." leading-type " protective device can dredge power frequency arc, will
The position of arc root burning is transferred on specific fitting from breakdown place, mainly includes wire stripping type arc-preventing metal utensil, Clamping pillar
Porcelain/composite insulator, stab-type arc-protection fitting and penetration type Clamping pillar porcelain/composite insulator etc.." blocking type " protection
A possibility that device then prevents the power frequency continued flow starting the arc, and complete " blocking " conducting wire is by calcination, mainly includes string outside circumferential electrode bands
Join gap metal Oxide Arrester and penetrating electrodes band external series gap metal oxide arrester etc..
Line measure is struck off for overhead insulated conductor lightning protection, being all based on piercing greatly, (wire stripping formula strips one section of insulation
Layer) high-field electrode.Because the isolation of insulated conductor insulated hull, piercing electrode is due to having punctured insulated hull and cable core conductor phase
Even, it is ensured that high-field electrode and the same current potential of conducting wire not will receive and put the uncertain influence in a position.But piercing (wire stripping formula)
The part that high-field electrode will lead to conducting wire is exposed, it is not in place to puncture and punctures excessive damage wires problem.10kV overhead power transmission is led
Conducting wire fusing accident at penetrating cable clamp caused by line once repeatedly occurred because of penetrating cable clamp contact deficiency or poor contact.For this purpose, needing
The overhead insulated conductor lightning protection for developing non-piercing formula high-field electrode strikes off line method and device.
Summary of the invention
The present invention provides a kind of 10kV insulated conductor anti-lightning strike broken string protective devices and mounting distance to determine method, uses
With solve the problems, such as piercing high-field electrode will lead to conducting wire part it is exposed, puncture skills that are not in place and puncturing excessive damage wires
Art problem.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
The anti-lightning strike broken string protective device of a kind of 10kV insulated conductor, comprising: insulator, non-piercing formula high-field electrode and keep away
Thunder device, insulator suspension are installed on 10kV suspended insulated guide wire, and the ground terminal of arrester passes through the ground connection of bracket and insulator
End connects and fixes, and non-piercing formula high-field electrode is fixedly mounted on suspended insulated guide wire and keeps locating distance with insulator axis
From L, the ontology high-voltage end and non-piercing formula high-field electrode of arrester are connected directly.
Further improvement as the device of the invention:
Arrester is metal oxide arrester, setting angle and insulation of the lightning arrester body relative to suspended insulated guide wire
Son is consistent relative to the setting angle of suspended insulated guide wire.
Non-piercing formula high-field electrode includes: high-field electrode top and high-field electrode lower part, high-field electrode top and high-voltage electricity
Pole lower part be include a pair of semicolumn opposing upper and lower, the two sides of semicolumn are provided with mounting portion, high-field electrode top and height
When piezoelectricity pole lower part passes through mounting portion split, semicolumn opposing upper and lower surrounds the channel for forming clamping suspended insulated guide wire；It is high
Pressure electrode upper is made of copper product；High-field electrode lower part is made of stainless steel material.
Mounting portion is to be connected to semicolumn side and from the inside to the outside gradually convergent triangle, high-field electrode top and height
Mounting portion is connected split by stainless steel bolt by piezoelectricity pole lower part.
The end of the ontology high-voltage end of arrester is spherical or hemispherical, spherical or hemispherical and non-piercing formula high-field electrode
It contradicts and is connected or is weldingly connected.
Mounting distance L meets: when non-piercing formula high-field electrode and insulator axial line distance mounting distance L,
ULS0.1%=1.1 (U1mA+UL99.9%) (2)
Wherein, UL99.9%Occur for the surface of insulating layer of insulator axis to the insulated conductor between arrester installation site
The discharge voltage that probability of flashover is 99.9%；U1mAFor lightning arrester body discharge voltage；ULS0.1%For the insulation of 0.1% probability of happening
Sub- impulse sparkover voltage.
The present invention also provides a kind of mounting distance of above-mentioned anti-lightning strike broken string protective device of 10kV insulated conductor is true
Determine method, comprising the following steps:
The mounting distance maximum value L between non-piercing formula high-field electrode and insulator axis is determined by following principlemax: when
Non-piercing formula high-field electrode and insulator axial line distance mounting distance LmaxWhen,
ULS0.1%=U1mA+UL99.9% (1)
Wherein, UL99.9%Occur for the surface of insulating layer of insulator axis to the insulated conductor between arrester installation site
The discharge voltage that probability of flashover is 99.9%；U1mAFor lightning arrester body discharge voltage；ULS0.1%For the insulation of 0.1% probability of happening
Sub- lightning impulse flashover voltage；
Determine mounting distance minimum value LminFor 150mm；
Non-piercing formula high-field electrode is obtained to be fixedly mounted on suspended insulated guide wire and keep locating distance with insulator axis
Selection section [L from L peacemin,Lmax]。
As further improvements in methods of the invention:
Preferably, method further include:
The best mounting distance L between non-piercing formula high-field electrode and insulator axis is determined by following principleopt: when non-
Piercing high-field electrode and insulator axial line distance mounting distance LmaxWhen,
ULS0.1%=1.1 (U1mA+UL99.9%) (2)。
Preferably, method further include:
Work as LmaxLess than requirement minimum mounting distance 150mm when, arrester replacing is smaller lightning-arrest at discharge voltage
Device re-starts test；
Work as LmaxGreater than 150mm, and best mounting distance LoptLess than the minimum mounting distance 150mm of requirement, then L is takenopt=
150mm。
Preferably, mounting distance maximum value L is determinedmaxOr best mounting distance Lopt, comprising the following steps:
The test method boosted step by step according to lightning impulse test measures high-field electrode under the same terms and is located at difference
The multi-group data of insulated conductor dielectric surface flashover voltage under mounting distance L is carried out at data using Weibull probability Distribution Model
Reason, obtains the edge flashing voltage U of 99.9% discharge probability of insulated hull under different mounting distance LL99.9%；According to power function
Discharge probability prototype is fitted UL99.9%With the functional relation between mounting distance L:
UL99.9%=f (L) (3)；
The test method boosted step by step according to lightning impulse test measures the multiple groups of the edge flashing voltage of insulator
Data, using Weibull probability Distribution Model carry out data processing, obtain respective 0.1% discharge probability of insulator along face
Flashover voltage ULS0.1%；
Determine the ontology discharge voltage U for the arrester selected1mA；
By formula (1) or (2) and formula (3), mounting distance maximum value L is obtainedmaxOr best mounting distance Lopt。
The invention has the following advantages:
1, the anti-lightning strike broken string protective device of 10kV insulated conductor of the invention, can block electric arc, effectively play lightning protection
The effect of line is struck off, while suspended insulated guide wire is not caused to damage, avoids suspended insulated guide wire that line-outage contingency occurs.Also,
The present invention is connected directly using the ontology high-voltage end and non-piercing formula high-field electrode of arrester, does not need Exact calculation and design is kept away
Clearance distance between thunder device and electrode greatly reduces the difficulty of in-site installation and operation and maintenance.
2, the mounting distance of 10kV insulated conductor anti-lightning strike broken string protective device of the invention determines method, considers electric discharge
The uncertainty of point position, devises installation section and best position, accurately can quickly instruct the device of the invention
Installation.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the anti-lightning strike broken string protective device of 10kV insulated conductor of the preferred embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the non-piercing formula high-field electrode of the preferred embodiment of the present invention；
Fig. 3 is the top view of Fig. 2；
Fig. 4 is the P10 insulator lightning impulse voltage test result schematic diagram of the preferred embodiment of the present invention 2；
Fig. 5 is the P15 insulator lightning impulse voltage test result schematic diagram of the preferred embodiment of the present invention 2；
Fig. 6 is the experimental result of the multiple flashover in insulated conductor surface of the different flashover distances of the preferred embodiment of the present invention 2
Schematic diagram；
Fig. 7 is the mounting distance and 99.9% lightning impulse flashover voltage curved line relation of the preferred embodiment of the present invention 2.
Each label indicates in figure:
1,10kV insulated conductor；2, insulator；3, non-piercing formula high-field electrode；4, arrester；5, high-field electrode top；6,
High-field electrode lower part；7, mounting portion；8, semicolumn；9, stainless steel bolt；10, screw hole.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Referring to Fig. 1, the anti-lightning strike broken string protective device of 10kV insulated conductor of the invention, comprising: insulator 2, non-piercing
Formula high-field electrode 3 and arrester 4, the suspension of insulator 2 are installed on 10kV suspended insulated guide wire, and the ground terminal of arrester 4 passes through
Bracket connect and fixes with the ground terminal of insulator 2, and non-piercing formula high-field electrode 3 is fixedly mounted on suspended insulated guide wire (this reality
Apply in example as 10kV insulated conductor 1) on and with 2 axis of insulator keep mounting distance L, the ontology high-voltage end of arrester 4 and non-
Piercing high-field electrode 3 is connected directly.
Electric arc can be dredged, the effect of anti-lightning strike broken string is effectively played, while not causing to damage to suspended insulated guide wire, keeps away
Exempt from suspended insulated guide wire and lightning-caused breaking accident occurs.
When implementation, the end of the ontology high-voltage end of arrester 4 is spherical or hemispherical, spherical or hemispherical and non-piercing formula
High-field electrode 3, which contradicts, to be connected or is weldingly connected.The present invention uses the ontology high-voltage end and non-piercing formula high-field electrode of arrester 4
3 are connected directly, and do not need Exact calculation and design the clearance distance between arrester 4 and electrode, greatly reduce in-site installation
And the difficulty of operation and maintenance.If in device due to joined the series gap between arrester 4 and electrode, although to arrester
4 service life increases, but due to gap discharge problem, improves arcing time when insulated conductor electric discharge, will lead to
The increase of Broken of Overhead Insulation Lines By Lightning probability；And clearance distance needs precisely setting, increases in-site installation and operation dimension
The difficulty of shield.
When the present invention is implemented, arrester 4 is metal oxide arrester, and 4 ontology of arrester is relative to suspended insulated guide wire
Setting angle of the setting angle with insulator 2 relative to suspended insulated guide wire be consistent.
Referring to fig. 2, Fig. 3, when implementation, non-piercing formula high-field electrode 3 is using such as flowering structure, comprising: 5 He of high-field electrode top
High-field electrode lower part 6, high-field electrode top 5 and high-field electrode lower part 6 be include a pair of semicolumn 8 opposing upper and lower, semicolumn 8
Two sides be provided with mounting portion 7, mounting portion 7 is to be connected to 8 side of semicolumn and from the inside to the outside gradually convergent triangle,
Screw hole 10, high-field electrode top 5 and high-field electrode lower part 6 is offered on mounting portion 7 to connect mounting portion 7 by stainless steel bolt 9
Split is connect, semicolumn 8 opposing upper and lower is around the channel for forming clamping suspended insulated guide wire；High-field electrode top 5 is by copper product
It is made；High-field electrode lower part 6 is made of stainless steel material.
In practical application, although stainless steel has preferable strength character, durability, corrosion resistance and higher
Fusing point, the high temperature generated when can resist arc discharge, most of piercing high-field electrodes select stainless steel material.But due to
Magnetic conductivity is relatively large, as non-piercing formula electrode in use, stainless steel fitting be also easy to produce when being fixed on around insulated conductor compared with
Big eddy-current loss causes abnormal heating, thus should not be as the material of non-piercing electrode.
Compared to stainless steel, the plasticity of aluminium is strong, and magnetic conductivity is low, and eddy-current loss will be greatly lowered under the same conditions, non-
Piercing series gap Zinc-Oxide Arrester selects aluminium as the material of non-piercing electrode.However, operating experience shows: by
It is lower in the fusing point of aluminum material, when discharging, it is easy to be caused to deform by electric arc calcination.Consider the company with 4 ontology of arrester
It connects conveniently, and reduces vortex, prevent electric arc from burning deformation, the high-field electrode that the present embodiment uses combined material to constitute.High-voltage electricity
Pole consists of two parts, and is designed to that suitable radian is placed on insulated conductor, is connected and fixed using stainless steel bolt 9.Lower part makes
With stainless steel material, it is convenient to the welding of 4 top fitting of arrester, it is easy to process, and stainless steel material fusing point is high, is not burnt by electric arc
Burning influences.Upper electrode uses copper product, will not constitute the closed path of high magnetic permeability, reduce eddy-current loss, avoid exception
Fever, and corrosion-resistant, high temperature resistant, it is non-maintaining.
Arrester 4 is typically mounted on the load side of insulator 2, and setting angle is consistent with insulator 2.Arrester 4
Mounting distance between the non-piercing formula high-field electrode 3 and insulator 2 of institute's band should not be excessively close, in order to avoid destroy insulator 2 itself；Peace
Dress distance should not also fail in order to avoid unit protection acts on too far.Therefore, in order to guarantee that discharge path passes through arrester 4, make device
Reach expected protecting effect, the embodiment of the invention also provides a kind of above-mentioned 10kV insulated conductor anti-lightning strike broken string protection dresses
The mounting distance set determines method, comprising the following steps:
The mounting distance maximum value L between 2 axis of non-piercing formula high-field electrode 3 and insulator is determined by following principlemax:
When non-piercing formula high-field electrode 3 and 2 axial line distance mounting distance L of insulatormaxWhen,
ULS0.1%=U1mA+UL99.9% (1)
Wherein, UL99.9%It is sent out for the surface of insulating layer of 2 axis of insulator to the insulated conductor between 4 installation site of arrester
The discharge voltage that raw probability of flashover is 99.9%；U1mAFor 4 ontology discharge voltage of arrester；ULS0.1%For 0.1% probability of happening
2 lightning impulse flashover voltage of insulator；
Determine mounting distance minimum value LminFor 150mm；
Non-piercing formula high-field electrode 3 is obtained to be fixedly mounted on suspended insulated guide wire and keep installing with 2 axis of insulator
Selection section [the L of distance L peacemin,Lmax]。
When implementation, the best installation between 2 axis of non-piercing formula high-field electrode 3 and insulator can be also determined by following principle
Distance Lopt: when non-piercing formula high-field electrode 3 and 2 axial line distance mounting distance L of insulatormaxWhen,
ULS0.1%=1.1 (U1mA+UL99.9%) (2)。
Work as LmaxLess than requirement minimum mounting distance 150mm when, it is smaller lightning-arrest that arrester 4 is replaced with discharge voltage
Device re-starts test；
Work as LmaxGreater than 150mm, and best mounting distance LoptLess than the minimum mounting distance 150mm of requirement, then L is takenopt=
150mm。
When implementation, following steps can be used and determine mounting distance maximum value LmaxOr best mounting distance Lopt:
The test method boosted step by step according to lightning impulse test measures high-field electrode under the same terms and is located at difference
The multi-group data of insulated conductor dielectric surface flashover voltage under mounting distance L is carried out at data using Weibull probability Distribution Model
Reason, obtaining 2 axis of insulator to the surface of insulating layer generation probability of flashover of the insulated conductor between 4 installation site of arrester is
99.9% discharge voltage UL99.9%；According to the discharge probability prototype of power function, it is fitted UL99.9%With the letter between mounting distance L
Number relationship:
UL99.9%=f (L) (3)；
The test method boosted step by step according to lightning impulse test measures the more of the edge flashing voltage of insulator 2
Group data carry out data processing using Weibull probability Distribution Model, obtain the exhausted of respective 0.1% probability of happening of insulator 2
2 lightning impulse flashover voltage U of edgeLS0.1%；
Determine the ontology discharge voltage U for the arrester 4 selected1mA；
By formula (1) or (2) and formula (3), mounting distance maximum value L is obtainedmaxOr best mounting distance Lopt。
Above-mentioned steps, can be ensured by minute design 2 flashover voltage of insulator be higher than 4 operating voltage of arrester and absolutely
The sum of edge conducting wire edge flashing voltage enables arrester 4 to start to work before flashover occurs for insulator 2, plays preferably
Lightning protection effect.Because arrester 4 has the characteristics that no afterflow and good C-V characteristic, can be leaked into greatly in lightning current
Power frequency continued flow is cut off behind ground, finally restores state of insulation.So the device can effectively inhibit power frequency continued flow to generate electric arc, not only
The burn of 2 cluster parachute of insulator is avoided, while electric arc calcination 10kV suspended insulated guide wire being avoided to cause line-outage contingency.
Citing further illustrates below:
Embodiment 1:
In the present embodiment, mounting distance maximum value L is determined using following stepsmaxOr best mounting distance Lopt:
1, measurement high-field electrode is located at the insulated conductor dielectric surface flashover voltage under different installation site L, and carries out at data
Reason.
(1) select L for 80,90,100,110 and 120mm respectively.Discharge test under each spacing is according to lightning impulse
The test method that discharge test is boosted step by step carries out 20 times respectively, obtains 20 independent discharge test numbers under the same terms
According to；
(2) to insulated hull edge flashing voltage test under different gap as a result, being carried out using Weibull probability Distribution Model
Data processing, surface of insulating layer of 2 axis of insulator to the insulated conductor between 4 installation site of arrester under each spacing obtained
The discharge voltage U that probability of flashover is 99.9% occursL99.9%。
(3) according to the discharge probability prototype of power function, 2 axis of insulator is fitted to exhausted between 4 installation site of arrester
The discharge voltage U that probability of flashover is 99.9% occurs for the surface of insulating layer of edge conducting wireL99.9%With the flashover distance L on insulated hull it
Between functional relation UL99.9%=f (L).
2, the edge flashing voltage of insulator 2 is measured, and carries out data processing.
(1) overhead insulating used in actual track is led according to the test method that lightning impulse test boosts step by step
Line carries out 20 lightning impulse tests with insulator 2；
(2) data processing is carried out using Weibull probability Distribution Model, obtains respective 0.1% probability of happening of insulator 2
2 lightning impulse flashover voltage U of insulatorLS0.1%。
3,10kV suspended insulated guide wire leakage conductor 4 is selected, and determines its U1mA。
4, according to Insulation Coordination principle, best mounting distance Lo is selectedpt。
(1) by ULS0.1%=1.1 (U1mA+UL99.9%), obtain the creeping discharge voltage U of insulated hullL99.9%。
(2) by UL99.9%=f (L) obtains best mounting distance Lopt。
5, according to test result, if LmaxLess than the minimum mounting distance 150mm of requirement, then arrester 4 should be replaced, selected
The smaller arrester 4 of discharge voltage is selected, guarantees LmaxGreater than 150mm；If testing obtained LmaxGreater than 150mm, and best peace
Fill distance LoptLess than the minimum mounting distance 150mm of requirement, then L is actually takenopt=150mm.
Embodiment 2:
According to relevant criterion, it may be determined that the concrete model and parameter of 4 ontology of insulator 2 and arrester.Wherein the present embodiment
2 model of insulator select P15 and P10 pin insulator, 4 model of arrester is determined as YH5WS-12.7/50, wherein arrester
4 voltage rating Ur are 12.7kV, continuous running voltage UcTake 0.8Ur；Direct current 1mA reference voltage U1mASize is 25kV；0.75 times
Direct current 1mA reference voltage U1mAUnder leakage current should be less than being equal to 50 μ A, nominal discharge current takes 5kA.
It is adopted for the lightning impulse flashover voltage and insulated conductor edge flashing voltage, the present embodiment of measuring device insulator 2
Discharge test device, voltage generator are 400kV standard lightning impulse voltage generator, and can provide wave front time is
1.2 μ s (error is in 30%) and half-wave time to peak are 50 μ s (error is in 20%), and voltage peak range is 30~400kV
Lightning surge.Divider is BHT400kV underdamping condenser divider, no-load voltage ratio 400:1.
After optional test object (insulator 2, ring are between insulating surface ring electrode), lightning impulse is carried out to subjects
Sparking voltage test.Using pressurization step by step when test, i.e. the selection of test initial voltage value is unsuitable excessively high, not such as subjects
Flashover occurs and then increases 5kV, continues next round discharge test, increases voltage step by step until flashover, note occur for subjects
Carry final flashover voltage value.20 discharge tests are repeated to same subjects, obtain battery of tests result.
P15 the and P10 pin insulator Lightening impulse test result difference that test measurement obtains is as shown in Figure 4 and Figure 5.Figure
20 independent edge flashing voltage tester values of P15 and P10 pin insulator are set forth in 4 and Fig. 5.
2 multiple discharge of insulator under the same terms is tested according to Weibull probability Distribution Model with Matlab software
As a result it is handled, obtains the 2 discharge voltage numerical value of insulator of 0.1% discharge probability.It is calculated analytically, finally determines P10
2 lightning impulse flashover voltage of insulator of 0.1% probability of happening of insulator is ULS0.1%=138.0919kV, P15 insulator
2 lightning impulse flashover voltage of insulator of 0.1% probability of happening is ULS0.1%=173.4036kV.
Insulated conductor insulating layer under the high-field electrode that test measurement obtains to mounting distances different between 2 axis of insulator it
Between ring to as shown in Figure 6 along face sparking voltage test result under ring electrode.Fig. 6 gives using ring under ring electrode, high pressure
Electrode is to the insulated conductor insulating layer creeping discharge of (L is from 80mm to 120mm) is electric when different mounting distances between 2 central axes of insulator
20 independent test results of pressure.
Using same method, insulation under the same terms is led according to Weibull probability distribution method with Matlab software
The experimental result that multiple flashover occurs for line surface is handled, and obtains under corresponding spacing 2 axis of insulator to 4 installation position of arrester
The discharge voltage U that probability of flashover is 99.9% occurs for the surface of insulating layer of the insulated conductor between settingL99.9%As shown in table 1.
1 insulator axis of table is to the insulated conductor between arrester installation site
The discharge voltage that probability of flashover is 99.9% occurs for surface of insulating layer
(5) obtain 4 installation site L of arrester and 2 axis of insulator to 4 installation position of arrester respectively by power function fitting
The discharge voltage U that probability of flashover is 99.9% occurs for the surface of insulating layer of the insulated conductor between settingL99.9%Relation curve, such as
Shown in Fig. 7.Fig. 7 gives the 4 installation site L of arrester that fitting obtains and 2 axis of insulator between 4 installation site of arrester
Insulated conductor surface of insulating layer occur probability of flashover be 99.9% discharge voltage UL99.9%Relation curve.
It is U by the correspondence fitting function obtained after data processingL99.9%=0.2489*L1.209Formula (2)
(6) formula (1) and matched curve functional relation (2) are substituted into.
To P10 insulator: obtaining insulated conductor insulation of the high-field electrode maximum mounting distance between 2 axis of insulator
The edge flashing voltage of layer: ULmax=173.0919kV, L can be obtained by substituting into fitting functionmax=157.7685mm；High-field electrode is most
The edge flashing voltage U of insulated conductor insulating layer of the good mounting distance between 2 axis of insulatorLopt=100.5381kV,
L can be obtained by substituting into fitting functionopt=143.1375mm.Since Lopt is less than 150mm at this time, thus practical Lopt takes 150mm.
To P15 insulator: insulated conductor insulating layer of the high-field electrode maximum mounting distance between 2 axis of insulator
Edge flashing voltage ULmax=148.4036kV, L can be obtained by substituting into fitting functionmax=197.5297mm；High-field electrode is most preferably installed
The edge flashing voltage U of insulated conductor insulating layer of the distance between 2 axis of insulatorLopt=132.6370kV is substituted into quasi-
L can be obtained by closing functionopt=160.2372mm.Thus, L at this timeoptTake 161mm.
In summary, it is former to propose the Insulation Coordination compared based on probability by using minute design theory by the present invention
Then, that is, the data processing method for utilizing Weibull probability Distribution Model, compares discharge probability by Case Experiments On A and calculating, obtains
4 parameter of arrester and its best mounting distance that P15 and P10 insulator matches are arrived.Lightning protection proposed by the invention
Device can block electric arc, effectively play the effect of anti-lightning strike broken string, while not causing to damage to suspended insulated guide wire.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of anti-lightning strike broken string protective device of 10kV insulated conductor characterized by comprising insulator (2), non-piercing formula
High-field electrode (3) and arrester (4), insulator (2) suspension are installed on 10kV suspended insulated guide wire, the arrester
(4) ground terminal is connect and is fixed with the ground terminal of insulator (2) by bracket, and the non-piercing formula high-field electrode (3) is fixed
It is mounted on suspended insulated guide wire and keeps mounting distance L with the insulator (2) axis, the ontology of the arrester (4) is high
Pressure side and non-piercing formula high-field electrode (3) are connected directly.
2. the anti-lightning strike broken string protective device of 10kV insulated conductor according to claim 1, which is characterized in that described lightning-arrest
Device (4) is metal oxide arrester, setting angle and insulator of arrester (4) ontology relative to suspended insulated guide wire
(2) it is consistent relative to the setting angle of suspended insulated guide wire.
3. the anti-lightning strike broken string protective device of 10kV insulated conductor according to claim 1, which is characterized in that described non-to wear
Thorn formula high-field electrode (3) includes: high-field electrode top (5) and high-field electrode lower part (6), the high-field electrode top (5) and height
Piezoelectricity pole lower part (6) be include a pair of semicolumn (8) opposing upper and lower, the two sides of the semicolumn (8) are provided with mounting portion
(7), when the high-field electrode top (5) and high-field electrode lower part (6) pass through mounting portion (7) split, described opposing upper and lower half
Cylinder (8) clamps the channel of the suspended insulated guide wire around being formed；The high-field electrode top (5) is made of copper product；Institute
High-field electrode lower part (6) is stated to be made of stainless steel material.
4. the anti-lightning strike broken string protective device of 10kV insulated conductor according to claim 3, which is characterized in that the installation
Portion (7) is to be connected to the semicolumn (8) side and from the inside to the outside gradually convergent triangle, the high-field electrode top
(5) pass through stainless steel bolt (9) with high-field electrode lower part (6) and mounting portion (7) are connected into split.
5. the anti-lightning strike broken string protective device of 10kV insulated conductor according to any one of claim 1 to 4, feature exist
In the end of the ontology high-voltage end of the arrester (4) is spherical or hemispherical, the spherical or hemispherical and the non-piercing
Formula high-field electrode (3), which contradicts, to be connected or is weldingly connected.
6. the anti-lightning strike broken string protective device of 10kV insulated conductor according to claim 5, which is characterized in that the installation
Distance L meets: when the non-piercing formula high-field electrode (3) and the insulator (2) axial line distance mounting distance L,
ULS0.1%=1.1 (U1mA+UL99.9%) (2)
Wherein, UL99.9%It is sent out for the surface of insulating layer of insulator (2) axis to the insulated conductor between arrester (4) installation site
The discharge voltage that raw probability of flashover is 99.9%；U1mAFor arrester (4) ontology discharge voltage；ULS0.1%For 0.1% probability of happening
Insulator (2) lightning impulse flashover voltage.
7. a kind of installation for using protective device such as the anti-lightning strike broken string of 10kV insulated conductor described in any one of claims 1 to 6
Distance determines method, which comprises the following steps:
The mounting distance between the non-piercing formula high-field electrode (3) and the insulator (2) axis is determined most by following principle
Big value Lmax: when the non-piercing formula high-field electrode (3) and the insulator (2) axial line distance mounting distance LmaxWhen,
ULS0.1%=U1mA+UL99.9% (1)
Wherein, UL99.9%It is sent out for the surface of insulating layer of insulator (2) axis to the insulated conductor between arrester (4) installation site
The discharge voltage that raw probability of flashover is 99.9%；U1mAFor arrester (4) ontology discharge voltage；ULS0.1%For 0.1% probability of happening
Insulator (2) impulse sparkover voltage；
Determine mounting distance minimum value LminFor 150mm；
Non-piercing formula high-field electrode (3) is obtained to be fixedly mounted on suspended insulated guide wire and keep with the insulator (2) axis
Selection section [the L of mounting distance L peacemin,Lmax]。
8. the mounting distance of 10kV insulated conductor anti-lightning strike broken string protective device according to claim 7 determines method,
It is characterized in that, the method also includes:
The best locating distance between the non-piercing formula high-field electrode (3) and the insulator (2) axis is determined by following principle
From Lopt: when the non-piercing formula high-field electrode (3) and the insulator (2) axial line distance mounting distance LmaxWhen,
ULS0.1%=1.1 (U1mA+UL99.9%) (2)。
9. the mounting distance of 10kV insulated conductor anti-lightning strike broken string protective device according to claim 8 determines method,
It is characterized in that, the method also includes:
As the LmaxLess than requirement minimum mounting distance 150mm when, arrester (4) is replaced with to discharge voltage is smaller to be kept away
Thunder device re-starts test；
As the LmaxGreater than 150mm, and best mounting distance LoptLess than the minimum mounting distance 150mm of requirement, then L is takenopt=
150mm。
10. true according to the mounting distance of the anti-lightning strike broken string protective device of 10kV insulated conductor described in claim 7 or 8 or 9
Determine method, which is characterized in that determine the mounting distance maximum value LmaxOr best mounting distance Lopt, comprising the following steps:
The test method boosted step by step according to lightning impulse test measures high-field electrode under the same terms and is located at different installations
The multi-group data of insulated conductor dielectric surface flashover voltage under distance L carries out data processing using Weibull probability Distribution Model,
Obtain the edge flashing voltage U of 99.9% discharge probability of insulated hull under different mounting distance LL99.9%；According to the electric discharge of power function
Probability prototype is fitted UL99.9%With the functional relation between mounting distance L:
UL99.9%=f (L) (3)；
The test method boosted step by step according to lightning impulse test measures the multiple groups of the edge flashing voltage of insulator (2)
Data carry out data processing using Weibull probability Distribution Model, obtain the edge of respective 0.1% discharge probability of insulator (2)
Face flashover voltage ULS0.1%；
Determine the ontology discharge voltage U for the arrester (4) selected1mA；
By formula (1) or (2) and formula (3), the mounting distance maximum value L is obtainedmaxOr best mounting distance Lopt。
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| CN111044810A (en) * | 2019-11-16 | 2020-04-21 | 国网浙江宁波市奉化区供电有限公司 | Simulation test method for lightning stroke protection and wire breaking effect of ground fault processing device |
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| CN109767886B (en) | 2021-01-12 |
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