CN110535089A - Power distribution network lightning conducter indirect earthed laying method and device - Google Patents
Power distribution network lightning conducter indirect earthed laying method and device Download PDFInfo
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- CN110535089A CN110535089A CN201910964421.9A CN201910964421A CN110535089A CN 110535089 A CN110535089 A CN 110535089A CN 201910964421 A CN201910964421 A CN 201910964421A CN 110535089 A CN110535089 A CN 110535089A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/20—Active discharge triggering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/40—Connection to earth
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
- H02G13/60—Detecting; Measuring; Sensing; Testing; Simulating
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Abstract
Power distribution network lightning conducter provided by the present application indirect earthed laying method and device, wherein obtaining the lightning impulse breakdown voltage and frequency breakdown voltage under different air gap distances；The lightning impulse breakdown voltage of 99.9% probability and the relation function of clearance distance are obtained according to lightning impulse breakdown voltage；The frequency breakdown voltage of 0.1% probability and the relation function of clearance distance are obtained according to frequency breakdown voltage；The air gap d and the air gap s are respectively obtained according to lightning impulse voltage conduction threshold and single-line to ground fault power-frequency voltage；Air gap distance range (s, d) is obtained according to the air gap s and the air gap d；The air gap that distance range is (s, d) in parallel with composite insulator is obtained into parallel-connection structure；Parallel-connection structure is laid between earthing pole and lightning conducter；Using the voltage endurance of composite insulator and the flash-over characteristic of the air gap, parallel-connection structure is installed between lightning conducter and earthing pole, is realized indirect earthed between lightning conducter and earthing pole.
Description
Technical field
This application involves electric distribution network overhead wire technical field more particularly to a kind of power distribution network lightning conducter it is indirect earthed apply
Equipment, method and device.
Background technique
Distribution overhead line is the important component of power network, and effect is conveying and distribution electric energy；Distribution overhead line
Road is vacantly to be set up conducting wire using electric pole, directly to customer power supply；Distribution overhead line, which has, sets up simple, low cost, dimension
Repair the advantages that facilitating.
Lightning stroke easily leads to the insulator arc-over of distribution line, strikes off conducting wire etc., seriously affects the safety and stability of power distribution circuit
Operation, therefore power distribution network shocking preventing technology is gradually taken seriously, and lightning conducter is applied in distribution overhead line, it is single using laying
Lightning conducter is built by the mode that base is directly grounded.
But lightning conducter be directly grounded have the disadvantage that first is that distribution line normal operation under, three-phase conducting wire with keep away
Because electromagnetic induction generates couple current between thunder line, circulation is formed by being directly grounded for lightning conducter, the idle function of route will be increased
Rate loss influences power supply performance；Second is that there is single-line to ground fault in the 10kV distribution line in system with non effectively earth ed neutral
Afterwards, energy continuous service 1-2h, interior during this period, fault current can also pass through nearest lightning conducter in addition to flowing directly into the earth
Ground connection flows into overhead ground wire, and adjacent ground wire grounding pole is caused to generate high potential, forms step voltage distributed area, generates
Security risk.
Summary of the invention
This application provides a kind of laying methods and device that power distribution network lightning conducter is indirect earthed, to solve current lightning conducter
Existing electric energy loss and security risk problem caused by being directly grounded.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution:
In a first aspect, this application provides a kind of laying methods that power distribution network lightning conducter is indirect earthed, which comprises
The lightning impulse breakdown voltage and frequency breakdown voltage under different air gap distances are obtained respectively；
The lightning impulse breakdown voltage U of 99.9% probability is obtained according to the lightning impulse breakdown voltageI99.9%And clearance gap
From relation function；
The frequency breakdown voltage U of 0.1% probability is obtained according to the frequency breakdown voltageG0.1%With the relationship of clearance distance
Function；
U is respectively obtained according to lightning impulse voltage conduction threshold and single-line to ground fault power-frequency voltageI99.9%When the air gap
The value and U of dG0.1%When the air gap s value；
Air gap distance range (s, d) is obtained according to the air gap s and the air gap d；
The air gap that distance range is (s, d) in parallel with composite insulator is obtained into parallel-connection structure；
The parallel-connection structure is laid between earthing pole and lightning conducter.
Optionally, described that the lightning impulse breakdown voltage of 99.9% probability is obtained according to the lightning impulse breakdown voltage
UI99.9%With the relation function of clearance distance, comprising:
Using Matlab software using weber probability distribution method to the lightning impulse under the different air gap distances
Breakdown voltage handles to obtain the lightning impulse breakdown voltage U of 99.9% probabilityI99.9%；
Lightning impulse breakdown voltage U is obtained by power function numerical fittingI99.9%With the relation function f of clearance distance
(uI99.9%)=3.276d0.8265, wherein f (uI99.9%) it is lightning impulse breakdown voltage, d-clearance distance.
Optionally, described that the frequency breakdown voltage U of 0.1% probability is obtained according to the frequency breakdown voltageG0.1%The gap and
The relation function of distance, comprising:
Using Matlab software using weber probability distribution method to the lightning impulse under the different air gap distances
Breakdown voltage handles to obtain the frequency breakdown voltage U of 0.1% probabilityG0.1%；
Frequency breakdown voltage U is obtained by power function numerical fittingG0.1%With the relation function f (u of clearance distanceG0.1%)=
1.8723s0.6384, wherein f (uG0.1%)-frequency breakdown voltage (kV), s-clearance distance.
Optionally, described to be respectively obtained according to lightning impulse voltage conduction threshold and single-line to ground fault power-frequency voltage
UI99.9%When air gap d value and UG0.1%When the air gap s value, comprising:
Lightning impulse voltage conduction threshold is set, according to f (uI99.9%)=3.276d0.8265The value of the air gap d is obtained,
Wherein the lightning impulse voltage conduction threshold can be adjusted according to the difference of practical application scene；
Single-line to ground fault power-frequency voltage=5.7kV is set, according to f (uG0.1%)=1.8723s0.6384Obtain the air gap
The value of s.
Second aspect, based on the indirect earthed laying method of power distribution network lightning conducter provided by the present application, the application is also provided
A kind of laying apparatu that power distribution network lightning conducter is indirect earthed, described device are laid between lightning conducter and earthing pole, the dress
It sets and includes:
Composite insulator and the air gap, the composite insulator and the air gap are connected in parallel to form parallel-connection structure；
The both ends of the air gap are respectively equipped with arc extinguishing ball, and the arc extinguishing ball is connect with starting rod, the starting rod
End point is connect with removable movable slider；
The removable movable slider is used to adjust the distance of the air gap.
Optionally, described device further includes upper metal termination and lower metal termination, in which:
The upper metal termination is fixedly connected with the lightning conducter；
The lower metal termination is fixedly connected with the earthing pole.
Optionally, described device further include: voltage generator, divider and conductor, in which: the voltage generator and institute
It states divider and is connected in parallel the rear and conductor series connection.
Optionally, the voltage generator is set as impulse voltage generator or power frequency experimental transformer；The divider is set
For condenser divider.
Optionally, described device further includes support insulator, and the support insulator is used to support the composite insulator
The parallel-connection structure to be formed is connected in parallel with the air gap.
Compared with prior art, the application has the beneficial effect that
Power distribution network lightning conducter provided by the present application indirect earthed laying method and device, utilize the pressure resistance of composite insulator
The parallel-connection structure of composite insulator formation in parallel with the air gap is installed on lightning conducter by the flash-over characteristic of characteristic and the air gap
Between earthing pole, realize it is indirect earthed between lightning conducter and earthing pole, by being installed additional between lightning conducter and earthing pole
The mode of composite insulator and the air gap, which is realized, to be indirectly connected with, and the thunder under defined threshold is made in the distance range of the air gap
Surge voltage can puncture the air gap and discharge, but the power-frequency voltage in operational process can not puncture the air gap progress
Electric discharge, then shaft tower and lightning conducter completely cut off under normal running (operation) conditions, and the air gap destroys the conducting between shaft tower and lightning conducter, and three
The couple current generated between phase conductor and lightning conducter can not form circulation, avoid the consumption of electric energy in route；Under the conditions of thunder and lightning
Lightning surge can be discharged by the air gap, protect equipment；In the 10kV distribution of system with non effectively earth ed neutral
When single-line to ground fault occurs in route, step voltage distributed areas cannot climb electricity along earthing pole, and the air gap can prevent to stride
The extension of voltage's distribiuting region, the security risk generated when reducing route single-phase earthing.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the flow diagram of the indirect earthed laying method of power distribution network lightning conducter provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the indirect earthed laying apparatu of power distribution network lightning conducter provided in an embodiment of the present invention；
Fig. 3 is the structure of the parallel-connection structure of the indirect earthed laying apparatu of power distribution network lightning conducter provided in an embodiment of the present invention
Schematic diagram；
Fig. 4 is the earthing mode signal of the indirect earthed laying apparatu of power distribution network lightning conducter provided in an embodiment of the present invention
Figure.
Wherein:
21- voltage generator, 22- divider, 23- conductor, 24- support insulator, 25- composite insulator, 26- are removable
Sliding block, 27- starting rod, the air gap 28-, 31- arc extinguishing ball, the upper metal termination of 32-, metal termination under 33-, 42- lightning conducter,
43- earthing pole.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The application protection all should belong in art personnel every other embodiment obtained without making creative work
Range.
The lightning conducter in power distribution network is directly grounded with earthing pole at present, then because of electromagnetic induction between three-phase conducting wire and lightning conducter
Couple current is generated, circulation is formed by being directly grounded for lightning conducter, will increase route reactive power loss influences power supply performance,
Therefore the application provides a kind of laying method and device that lightning conducter is indirect earthed.
Referring to attached drawing 1, Fig. 1 shows the indirect earthed laying method of power distribution network lightning conducter provided by the embodiments of the present application
Flow diagram.With reference to the accompanying drawing the indirect earthed laying method of 1 pair of power distribution network lightning conducter provided by the embodiments of the present application into
Row explanation.
This application provides a kind of laying methods that power distribution network lightning conducter is indirect earthed, which comprises
S110: the lightning impulse breakdown voltage and frequency breakdown voltage under different air gap distances are obtained respectively.
Enable the lightning impulse voltage under defined threshold puncture the air gap in the application to discharge, but operational process
In power-frequency voltage can not puncture the air gap and discharge；Realize that the core of above-mentioned function is to select accurate the air gap
Distance.Air gap distance selects the improper lightning impulse voltage being likely to occur under defined threshold that can not puncture the air gap, or
Power-frequency voltage flashover the air gap electric discharge in operational process, then can not solve the shortcomings of the prior art.
The air gap C lightning impulse breakdown test method in parallel: one group of clearance distance (d of setting1, d2, d3..., dn), from
Clearance distance d1Start to test.Start to apply a lower voltage, do not puncture such as, then increase 1kV voltage and continue to test,
Lightning impulse breakdown voltage U until puncturing, when record punctures1-1；In clearance distance d1It is lower to repeat experiment 30 times,
Obtain 30 clearance distance d1Lightning impulse breakdown voltage value (U1-1, U1-2, U1-3..., U1-30)；It is right respectively by above-mentioned steps
d2, d3..., dnIt is tested, obtains the lightning impulse breakdown voltage value under different gap.
C power-frequency discharge experimental method in the air gap in parallel: one group of clearance distance (s of setting1, s2, s3..., sn), from gap
Distance s1Start to test.Using continuous boosting method, boosts by the speed of 0.5kV/s, until puncturing, record the gap
Under a frequency breakdown voltage U1.1；In clearance distance s1It is lower to repeat experiment 30 times, obtain 30 clearance distance s1Power frequency hit
Wear voltage value (U1.1, U1.2, U1.3..., U1.30)；By above-mentioned steps, respectively to s2, s3..., snIt is tested, is obtained between difference
Corresponding 30 frequency breakdown voltage values under gap.
S120: the lightning impulse breakdown voltage U of 99.9% probability is obtained according to the lightning impulse breakdown voltageI99.9%With
The relation function of clearance distance.
S130: the frequency breakdown voltage U of 0.1% probability is obtained according to the frequency breakdown voltageG0.1%With clearance distance
Relation function.
To the experimental data of multiple disruptive discharge, handled according to the method for weber probability distribution, it is any convenient for obtaining
The discharge voltage value of disruptive discharge probability.Weibull distribution for two-dimensional parameter, probability function are as follows:
In formula: U-disruptive discharge voltage (kV)；M-form parameter；η-scale parameter.
Gap lightning impulse breakdown voltage and frequency breakdown voltage are handled using Matlab software, calculated separately
Out under each clearance distance 99.9% probability lightning impulse breakdown voltage UI99.9%, 0.1% probability frequency breakdown voltage
UG0.1%；By the method for power exponent numerical fitting, when obtaining using the air gap in parallel, lightning impulse breakdown voltage and gap
The relation function of distance:
f(uI99.9%)=3.276d0.8265
In formula: f (uI99.9%)-lightning impulse breakdown voltage (kV)；
D-clearance distance.
When similarly obtaining using the air gap in parallel, the relation function of frequency breakdown voltage and clearance distance:
f(uG0.1%)=1.8723s0.6384
In formula: f (uG0.1%)-frequency breakdown voltage (kV)；
S-clearance distance.
S140: U is respectively obtained according to lightning impulse voltage conduction threshold and single-line to ground fault power-frequency voltageI99.9%Space-time
The value and U of gas gap dG0.1%When the air gap s value.
Set the lightning impulse breakdown voltage U of the air gap C in parallel between lightning conducter and earthing polei(kV), it may be determined that
UI99.9%When air gap d value；The lightning impulse voltage conduction threshold can be adjusted according to the difference of practical application scene
It is whole.
Setting power frequency stops voltage: setting the power frequency impulse breakdown electricity of the air gap C in parallel between lightning conducter and earthing pole
Press Ug=5.7kV, determines UG0.1%The value of the air gap s when/5.7kV；
S150: air gap distance range (s, d) is obtained according to the air gap s and the air gap d.
Lightning impulse voltage UI99.9%Corresponding the air gap d and frequency breakdown voltage UG0.1%Between the corresponding air of/5.7kV
The value interval of gap s is air gap distance value interval in parallel.When lightning impulse pressure reaches UiWhen have 99.9% or more it is general
Rate makes the air gap disruptive discharge, when in route there are power-frequency voltage 5.7kV when single-line to ground fault have it is general less than 0.1%
Rate makes the air gap disruptive discharge, realizes the effect of lightning strike protection and one-phase ground protection.
S160: the air gap that distance range is (s, d) in parallel with composite insulator is obtained into parallel-connection structure.
By experiment and Data Analysis Services in the application, accurate air gap distance value interval is obtained, select sky
Gas clearance distance prepares the parallel-connection structure of a kind of composite insulator and the air gap.
S170: the parallel-connection structure is laid between earthing pole and lightning conducter.
The application is using the voltage endurance of composite insulator and the flash-over characteristic of the air gap, by composite insulator and air
The parallel-connection structure that gap parallel connection is formed is installed between lightning conducter and earthing pole, is realized indirect between lightning conducter and earthing pole
Ground connection is realized by way of installing composite insulator and the air gap additional between lightning conducter and earthing pole and is indirectly connected with, in sky
Enable the lightning impulse voltage under defined threshold puncture the air gap in the distance range in gas gap to discharge, but ran
Power-frequency voltage in journey can not puncture the air gap and discharge, then shaft tower and lightning conducter completely cut off under normal running (operation) conditions, air
Gap destroys the conducting between shaft tower and lightning conducter, and the couple current generated between three-phase conducting wire and lightning conducter can not form ring
Stream, avoids the consumption of electric energy in route；Lightning surge can be discharged by the air gap under the conditions of thunder and lightning, and protection is set
It is standby；When single-line to ground fault occurs in the 10kV distribution line of system with non effectively earth ed neutral, step voltage distributed areas are not
Electricity can be climbed along earthing pole, the air gap can prevent step voltage distributed areas from magnifying, and generate when reducing route single-phase earthing
Security risk.
Based on the indirect earthed laying method of power distribution network lightning conducter provided by the present application, present invention also provides a kind of distribution
The indirect earthed laying apparatu of net lightning conducter, described device are laid between lightning conducter 42 and earthing pole 43；Referring to attached drawing 2, Fig. 2
Show the structural schematic diagram of the indirect earthed laying apparatu of power distribution network lightning conducter provided by the embodiments of the present application.Below with reference to attached
Laying apparatu Fig. 2 indirect earthed to power distribution network lightning conducter provided by the embodiments of the present application is illustrated.
Described device includes:
Composite insulator 25 and the air gap 28, the composite insulator 25 and the air gap 28 are connected in parallel to form parallel connection
Structure；With specific reference to Fig. 3, Fig. 3 is the parallel connection of the indirect earthed laying apparatu of power distribution network lightning conducter provided in an embodiment of the present invention
The structural schematic diagram of structure；
The both ends of the air gap 28 are respectively equipped with arc extinguishing ball 31, and the arc extinguishing ball 31 is connect with starting rod 27, described
The end point of starting rod 27 is connect with removable movable slider 26；
The removable movable slider 26 is used to adjust the distance of the air gap 28.
Further, described device further includes upper metal termination 32 and lower metal termination 33, in which: the upper metal termination
32 are fixedly connected with the lightning conducter 42；The lower metal termination 33 is fixedly connected with the earthing pole 43.
Further, described device further include: voltage generator 21, divider 22 and conductor 23, in which: the voltage hair
Raw device 21 is connected after being connected in parallel with the divider 22 with the conductor 23.
Further, the voltage generator 21 is set as impulse voltage generator or power frequency experimental transformer；The partial pressure
Device 22 is set as condenser divider.
When carrying out Lightening impulse test, the voltage generator 21 is 1200kV impulse voltage generator, it is possible to provide wavefront
Time is 1.2 μ s and half-wave time to peak is 50 μ s, and voltage peak range is the lightning surge of 10~1200kV；The partial pressure
Device 22 is BHT1200kV underdamping condenser divider, and no-load voltage ratio 1380:1, air gap distance is selected as 20,25,30,35,
40,45mm.
Carry out power frequency breakdown test when, the voltage generator 21 be power frequency experimental transformer, voltage range be 0.38~
10kV, rated capacity 200kVA；The divider 22 is condenser divider, no-load voltage ratio 200:1, air gap distance selection
It is 5,10,15,20,25,30mm.
Described device further includes support insulator 24, and the support insulator 24 is used to support 25 He of composite insulator
The air gap 28 is connected in parallel the parallel-connection structure to be formed, it is ensured that structure insulation against ground.
The earthing mode of the indirect earthed laying apparatu entirety of power distribution network lightning conducter provided by the present application refers to Fig. 4, and Fig. 4 is
The earthing mode schematic diagram of the indirect earthed laying apparatu of power distribution network lightning conducter provided in an embodiment of the present invention.
In the present embodiment, if the lightning impulse voltage U of the air gap C in parallel between lightning conducter and earthing polei=35kV,
It can determine UI99.9%Air gap d=17.6mm when/35kV, then as the air gap d≤17.6mm, lightning impulse voltage reaches
Parallel connection the air gap is effectively connected when 35kV；If the frequency breakdown voltage of the air gap C in parallel between lightning conducter and earthing pole
UG0.1%=5.7kV, it may be determined that frequency breakdown voltage UG0.1%The air gap s=5.7mm when/5.7kV, then when the air gap s >=
5.7mm, power-frequency voltage can not puncture the air gap in parallel.Therefore the clearance distance of the air gap 28 in parallel be 5.7~
17.6mm can effectively solve the problem that the shortcomings of the prior art.
It is not directly connected between lightning conducter and earthing pole in the present embodiment, by parallel multiple between lightning conducter and earthing pole
The mode of conjunction insulator and the air gap, which is realized, to be indirectly connected with.The embodiment to be indirect earthed by base, answer by ground resistance resistance value
Meet DL/T620-1997 " overvoltage protection and Insulation Coordination of alternating-current electric device " described requirement.
Since embodiment of above is that reference combination is illustrated on other modes, have between different embodiments
There is identical part, identical, similar part may refer to each other between each embodiment in this specification.Herein no longer in detail
It illustrates.
Above-described the application embodiment does not constitute the restriction to the application protection scope.
Claims (9)
1. a kind of laying method that power distribution network lightning conducter is indirect earthed, which is characterized in that the described method includes:
The lightning impulse breakdown voltage and frequency breakdown voltage under different air gap distances are obtained respectively；
The lightning impulse breakdown voltage U of 99.9% probability is obtained according to the lightning impulse breakdown voltageI99.9%With clearance distance
Relation function；
The frequency breakdown voltage U of 0.1% probability is obtained according to the frequency breakdown voltageG0.1%With the relation function of clearance distance；
U is respectively obtained according to lightning impulse voltage conduction threshold and single-line to ground fault power-frequency voltageI99.9%When air gap d
Value and UG0.1%When the air gap s value；
Air gap distance range (s, d) is obtained according to the air gap s and the air gap d；
The air gap that distance range is (s, d) in parallel with composite insulator is obtained into parallel-connection structure；
The parallel-connection structure is laid between earthing pole and lightning conducter.
2. the indirect earthed laying method of power distribution network lightning conducter according to claim 1, which is characterized in that described according to institute
It states lightning impulse breakdown voltage and obtains the lightning impulse breakdown voltage U of 99.9% probabilityI99.9%With the relation function of clearance distance,
Include:
The lightning impulse under the different air gap distances is punctured using weber probability distribution method using Matlab software
Voltage handles to obtain the lightning impulse breakdown voltage U of 99.9% probabilityI99.9%；
Lightning impulse breakdown voltage U is obtained by power function numerical fittingI99.9%With the relation function f (u of clearance distanceI99.9%)=
3.276d0.8265, wherein f (uI99.9%) it is lightning impulse breakdown voltage, d is clearance distance.
3. the indirect earthed laying method of power distribution network lightning conducter according to claim 1, which is characterized in that described according to institute
It states frequency breakdown voltage and obtains the frequency breakdown voltage U of 0.1% probabilityG0.1%With the relation function of clearance distance, comprising:
The lightning impulse under the different air gap distances is punctured using weber probability distribution method using Matlab software
Voltage handles to obtain the frequency breakdown voltage U of 0.1% probabilityG0.1%；
Frequency breakdown voltage U is obtained by power function numerical fittingG0.1%With the relation function f (u of clearance distanceG0.1%)=
1.8723s0.6384, wherein f (uG0.1%) it is frequency breakdown voltage, s is clearance distance.
4. the indirect earthed laying method of power distribution network lightning conducter according to claim 1, which is characterized in that described according to thunder
Surge voltage turn-on threshold value and single-line to ground fault power-frequency voltage respectively obtain UI99.9%When air gap d value and UG0.1%
When the air gap s value, comprising:
Lightning impulse voltage conduction threshold is set, according to f (uI99.9%)=3.276d0.8265The value of the air gap d is obtained, wherein
The lightning impulse voltage conduction threshold can be adjusted according to the difference of practical application scene；
Single-line to ground fault power-frequency voltage=5.7kV is set, according to f (uG0.1%)=1.8723s0.6384Obtain taking for the air gap s
Value.
5. a kind of laying apparatu that power distribution network lightning conducter is indirect earthed, which is characterized in that described device is laid in lightning conducter (42)
Between earthing pole (43), described device includes:
Composite insulator (25) and the air gap (28), the composite insulator (25) and the air gap (28) are connected in parallel to be formed
Parallel-connection structure；
The both ends of the air gap (28) are respectively equipped with arc extinguishing ball (31), and the arc extinguishing ball (31) connect with starting rod (27),
The end point of the starting rod (27) is connect with removable movable slider (26)；
The removable movable slider (26) is used to adjust the distance of the air gap (28).
6. the indirect earthed laying apparatu of power distribution network lightning conducter according to claim 5, which is characterized in that described device is also
Including upper metal termination (32) and lower metal termination (33), in which:
The upper metal termination (32) is fixedly connected with the lightning conducter (42)；
The lower metal termination (33) is fixedly connected with the earthing pole (43).
7. the indirect earthed laying apparatu of power distribution network lightning conducter according to claim 5, which is characterized in that described device is also
Include:
Voltage generator (21), divider (22) and conductor (23), in which:
The voltage generator (21) is connected after being connected in parallel with the divider (22) with the conductor (23).
8. the indirect earthed laying apparatu of power distribution network lightning conducter according to claim 7, which is characterized in that the voltage hair
Raw device (21) are set as impulse voltage generator or power frequency experimental transformer；
The divider (22) is set as condenser divider.
9. the indirect earthed laying apparatu of power distribution network lightning conducter according to claim 5, which is characterized in that described device is also
Including support insulator (24), the support insulator (24) is used to support the composite insulator (25) and the air gap (28)
It is connected in parallel the parallel-connection structure to be formed.
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Cited By (2)
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| CN114152662A (en) * | 2020-09-08 | 2022-03-08 | 中国石油天然气集团有限公司 | Method, device and medium for determining safe distance between buried pipeline and alternating current grounding body |
| CN114325278A (en) * | 2022-03-16 | 2022-04-12 | 广东电网有限责任公司东莞供电局 | Air gap tolerance voltage measuring and calculating method and device, computer equipment and medium |
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Application publication date: 20191203 |