CN110445082A - The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line - Google Patents
The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line Download PDFInfo
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- CN110445082A CN110445082A CN201910768998.2A CN201910768998A CN110445082A CN 110445082 A CN110445082 A CN 110445082A CN 201910768998 A CN201910768998 A CN 201910768998A CN 110445082 A CN110445082 A CN 110445082A
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- distribution line
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/20—Spatial arrangements or dispositions of lines or cables on poles, posts or towers
Abstract
The invention discloses a kind of single-phase mounting structure of the parallel connection gaps of 10kV distribution line and its test methods, the structure includes: in 10kV distribution line, parallel connection gaps only are installed in a phase in one loop line road of same base shaft tower, two parallel connection gaps of two adjacent base shaft towers of left and right are separately mounted to the other two-phase in three-phase, and every three base phases neighbour's shaft tower is coupled one group of three parallel connection gaps.This method includes that the single-phase mounting structure that parallel connection gaps are installed in 10kV distribution line is simulated in simulation software, it is emulated, the indirect lightning strike trip-out rate and the counterattack trip-out rate under direct lightning strike for obtaining the inductive lightning of the single-phase mounting structure of parallel connection gaps and the 10kV distribution line under direct lightning strike.The present invention can further increase the resistance to Lei Shuiping of 10kV distribution line, and reduce its inductive lightning trip-out rate, improve the operational reliability of power distribution network on the basis of protecting the controller switching equipments such as insulator.
Description
Technical field
The present invention relates to the lightning protection field of 10kV distribution line more particularly to a kind of parallel connection gaps of 10kV distribution line
Single-phase mounting structure and its test method.
Background technique
The 10kV power distribution network complicated network structure, lightning protection measures are few, and resistance to thunder level is low, the lightning stroke of power distribution network under lightning surge
Failure rate is higher, needs to adopt an effective measure to reduce the lightning fault rate of power distribution network and damage to crops caused by thunder loss.In 10kV distribution line
In, lightning protection measures have wiring arrester, using insulator with parallel connection gaps etc..Between installation is in parallel in 10kV power distribution network
Gap is a kind of cost-effective Lighting Protection Measures, and gap discharge voltage is lower than the flashover voltage of insulator, therefore is generating thunder and lightning
In the case where overvoltage, gap elder generation and insulator arc-over discharge the energy of lightning current by gap, while protecting insulator.
Application study main sides of the parallel connection gaps in power distribution network focus on structure design, clearance distance determination and packing density
Aspect, in 10kV distribution line, the mounting means of traditional parallel connection gaps be the three-phase on same one loop line road of base shaft tower simultaneously
Installation causes the probability of sustained arc in gap to be also greater than insulation since the discharge voltage and arcing distance in gap will be less than insulator
Son.Thus, it under the mode of three-phase installation parallel connection gaps, is easier to that route two-phase or three-phase shortcircuit occurs, leads to distribution line thunder
Hit trip-out rate raising.
Summary of the invention
The present invention provides a kind of single-phase mounting structure of the parallel connection gaps of 10kV distribution line and its test method, to
It solves three-phase installation parallel connection gaps and route two-phase or three-phase shortcircuit easily occurs, the technology for causing distribution line tripping rate with lightning strike high is asked
Topic.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of single-phase mounting structure of the parallel connection gaps of 10kV distribution line, comprising:
In 10kV distribution line, parallel connection gaps are only installed in a phase in a loop line road of same base shaft tower, and left and right is adjacent
Two parallel connection gaps of two base shaft towers are separately mounted to the other two-phase in three-phase, and every three base phases neighbour's shaft tower is coupled one group three
A parallel connection gaps.
Preferably, comprising: parallel connection gaps are connected in parallel on insulator or insulator chain, are made of two electrodes, an electrode
It is mounted on high-pressure side, an electrode is mounted on ground potential side, and the clearance distance of parallel connection gaps is less than insulator or insulator chain
Structure height, two electrodes are the spheric electrode of stainless steel material, and two electrodes are that ball installs the gap of ball.
Preferably, when the shaft tower in 10kV distribution line is located at lightning induced voltage influence area, parallel connection gaps are put
Piezoelectric voltage is 111.2kV；When the shaft tower in 10kV distribution line is located at direct lightning strike influence area, the parallel connection of parallel connection gaps installation
The discharge voltage in gap is 83.4kV.
Preferably, when the shaft tower in 10kV distribution line is located at lightning induced voltage influence area, using the ball of electrode
When diameter is 25mm, the clearance distance of parallel connection gaps installation is 189.45mm~203.79mm, preferably 203.79mm；Work as 10kV
When shaft tower in distribution line is located at direct lightning strike influence area, when using the bulb diameter of electrode as 25mm, parallel connection gaps installation
Clearance distance is 147.19mm~161.14mm, preferably 147.19mm.
Preferably, direct lightning strike influence area be open field and or mountain area；Lightning induced voltage influence area is except direct attack
Region except thunder influence area.
Preferably, with three adjacent base shaft towers for a shaft tower group, same 10kV matches more base shaft towers in 10kV distribution line
The order of three parallel connection gaps of three-phase is identical in all shaft tower groups in electric line.
The present invention also provides a kind of tests of the single-phase mounting structure of parallel connection gaps according to above-mentioned 10kV distribution line
Method, comprising the following steps:
The single-phase installation that parallel connection gaps are installed in all shaft tower groups of route of 10kV distribution line is simulated in simulation software
Structure is emulated, and the sense of the inductive lightning of the single-phase mounting structure of parallel connection gaps and the 10kV distribution line under direct lightning strike is obtained
Answer the counterattack trip-out rate under tripping rate with lightning strike and direct lightning strike.
Preferably, indirect lightning strike trip-out rate n1It is calculated by following formula:
n1=NP1η(1)
In formula (1): N is the number being struck by lightning every year around certain certain length distribution line, P1It is big for amplitude of lightning current
In the probability for striking back the resistance to horizontal I of thunder, η is probability of sustained arc；
Counterattack trip-out rate n under direct lightning strike2It is calculated by following formula:
n2=N1P1gη(2)
In formula (2): N1For the number that certain certain length distribution line is struck by lightning every year, P1It is greater than for amplitude of lightning current anti-
Hit the probability of the horizontal I of resistance to thunder, η is probability of sustained arc, g be thunder and lightning hit distribution line shaft tower hit bar rate.
Preferably, probability of sustained arc η calculation formula is as follows:
η=4.5E0.75- 14 (%) (3)
In formula (3): E is the average operation electric potential gradient (virtual value) of insulator, unit kV/m；In 10kV distribution line
In,
In formula (4): UNFor route voltage rating (virtual value), unit kV；l1Between the arcing distance or parallel connection of insulator
Gap arcing distance, unit m；l2For the wire spacing of cross-arm route, unit m.
Preferably, amplitude of lightning current is greater than the probability P for striking back the resistance to horizontal I of thunder1Calculation formula is as follows:
The invention has the following advantages:
The single-phase mounting structure of the parallel connection gaps of 10kV distribution line of the invention, due to for 10kV distribution line,
Phase fault can just cause to trip, and allow singlephase earth fault charging operation in short-term.Therefore a phase gap discharge, passes through alternate coupling
The dielectric level that the other two-phase insulator of same base shaft tower can be improved is closed, the single-phase mounting means of parallel connection gaps can significantly improve
The resistance to thunder of the induction of distribution line and the resistance to Lei Shuiping of counterattack.
Test method through the invention can measure, when relative to gap is not added, 10kV distribution line of the invention and
The single-phase mounting structure in connection gap incudes resistance to thunder, and maximum can be improved 162.5%, 101.2% respectively with resistance to thunder level is struck back；Relatively
Under three-phase mounting means, maximum improves 642.25%, 313.79% respectively.Distribution under the single-phase mounting means of parallel connection gaps
The inductive lightning trip-out rate of route and counterattack trip-out rate respectively the maximum for three-phase mounting means can reduce by 89.42%,
63.66%.And the single-phase mounting means of parallel connection gaps can significantly reduce the inductive lightning trip-out rate of distribution line, maximum can reduce
48.08%.
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 single-phase mounting means schematic diagram of the parallel connection gaps of the preferred embodiment of the present invention.
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 single-phase mounting structure of the parallel connection gaps of 10kV distribution line of the invention, comprising: in 10kV distribution
In route, parallel connection gaps, two parallel connections of two adjacent base shaft towers of left and right are only installed in a phase in a loop line road of same base shaft tower
Gap is separately mounted to the other two-phase in three-phase, and every three base phases neighbour's shaft tower is coupled one group of three parallel connection gaps.Implementing
When, more base shaft towers in 10kV distribution line, for a shaft tower group, own with three adjacent base shaft towers in same 10kV distribution line
The preferred mounting means of three parallel connection gaps of three-phase is that order is identical in shaft tower group.Due to for 10kV distribution line, phase
Between short circuit can just cause to trip, allow singlephase earth fault charging operation in short-term.Therefore a phase gap discharge, passes through Coupling Between Phases
The dielectric level of the other two-phase insulator of same base shaft tower can be improved, the single-phase mounting means of parallel connection gaps, which can significantly improve, matches
The resistance to thunder of the induction of electric line and the resistance to Lei Shuiping of counterattack.
In the present embodiment, parallel connection gaps are connected in parallel on insulator or insulator chain, are made of two electrodes, an electrode peace
Mounted in high-pressure side, an electrode is mounted on ground potential side, and the clearance distance of parallel connection gaps is less than the knot of insulator or insulator chain
Structure height, two electrodes are the spheric electrode of stainless steel material, and two electrodes are that ball installs the gap of ball.
In the present embodiment, when the shaft tower in 10kV distribution line is located at lightning induced voltage influence area, inductive lightning mistake
Voltage influence region is the region (general representative region) in addition to direct lightning strike influence area, and lightning induced voltage is to cause to trip
The main reason for.The discharge voltage in installation parallel single-phase gap takes 111.2kV, in parallel when using the bulb diameter of electrode as 25mm
The clearance distance of gap installation is d=203.79mm.It may make 10kV distribution line tripping rate with lightning strike under lightning induced voltage
It is minimum, reduce 48.08%.Tripping rate with lightning strike is also at floor level under the counterattack of direct lightning strike.When in 10kV distribution line
Shaft tower when being located at direct lightning strike influence area, direct lightning strike influence area be open field and or mountain area；Parallel single-phase gap is installed
Discharge voltage takes 83.4kV, and when using the bulb diameter of electrode as 25mm, the clearance distance of parallel connection gaps installation is d=
147.19mm.At this time in 10kV distribution line under the counterattack of direct lightning strike, the horizontal highest of resistance to thunder of distribution line is reachable
17.1kA improves 101.2%；The resistance to thunder level of distribution line improves 146.12% up to 59.29kA under inductive lightning.
The present invention also provides a kind of tests of the single-phase mounting structure of parallel connection gaps according to above-mentioned 10kV distribution line
Method, comprising the following steps:
The single-phase mounting structure for installing parallel connection gaps in 10kV distribution line is simulated in simulation software, is emulated, is obtained
The indirect lightning strike trip-out rate of 10kV distribution line under to the inductive lightning and direct lightning strike of the single-phase mounting structure of parallel connection gaps and
Counterattack trip-out rate under direct lightning strike.P can be calculated by following formula (5)1；Probability of sustained arc is calculated by formula (3) and (4) again, finally
Indirect lightning strike trip-out rate is calculated by formula (1), calculates counterattack trip-out rate by formula (2).
Wherein, indirect lightning strike trip-out rate n1It is calculated by following formula:
n1=NP1η(1)
In formula (1): N is the number being struck by lightning every year around certain certain length distribution line, P1It is big for amplitude of lightning current
In the probability for striking back the resistance to horizontal I of thunder, η is probability of sustained arc；
Counterattack trip-out rate n under direct lightning strike2It is calculated by following formula:
n2=N1P1gη(2)
In formula (2): N1For the number that certain certain length distribution line is struck by lightning every year, P1It is greater than for amplitude of lightning current anti-
Hit the probability of the horizontal I of resistance to thunder, η is probability of sustained arc, g be thunder and lightning hit distribution line shaft tower hit bar rate.
Probability of sustained arc η calculation formula is as follows:
η=4.5E0.75- 14 (%) (3)
In formula (3): E is the average operation electric potential gradient (virtual value) of insulator, unit kV/m；In 10kV distribution line
In,
In formula (4): UNFor route voltage rating (virtual value), unit kV；l1Between the arcing distance or parallel connection of insulator
Gap arcing distance, unit m；l2For the wire spacing of cross-arm route (iron cross arm is selected in the present embodiment, takes l2=0), unit is
m。
Amplitude of lightning current is greater than the probability P for striking back the resistance to horizontal I of thunder1Calculation formula is as follows:
In calculating, due to the direct attack lightning stroke bar rate g of same route, certain certain length distribution line is struck by lightning every year
Times N1And the times N being struck by lightning every year around certain certain length distribution line is same value, therefore regard constant as.
To different routes, above-mentioned parameter value is different.
A certain initial value is arranged to gap discharge voltage, gradually changes amplitude of lightning current, observes each shaft tower insulator and dodges
Network and gap breakdown situation.When there is the electric discharge of certain base shaft tower two-phase insulator (or gap), corresponding maximum amplitude of lightning current
The horizontal I of the resistance to thunder of the inductive lightning of as route.According to the step, the clearance distance of parallel connection gaps is adjusted, respectively in parallel connection gaps
Resistance to Lei Shuiping of the different gap apart from lower distribution line is measured under single-phase mounting means and three-phase mounting means, is then compared
Compared with.
By above-mentioned steps, between the two kinds of parallel connections of single-phase mounting means and three-phase mounting means for calculating separately out parallel connection gaps
Gap mounting means corresponds to the tripping rate with lightning strike of the distribution line of different gap discharge voltage and strikes back trip-out rate and be compared.
Comparison result, when testing inductive lightning trip-out rate, d=203.79mm, so that 10kV distribution line is excessively electric in inductive lightning
It is minimum to depress tripping rate with lightning strike, reduces 48.08%, tripping rate with lightning strike is also at floor level under the counterattack of direct lightning strike.It surveys
When trying tripping rate with lightning strike under the counterattack of direct lightning strike, when using the bulb diameter of electrode as 25mm, d=147.19mm, at this time in 10kV
Distribution line is under the counterattack of direct lightning strike, the horizontal highest of resistance to thunder of distribution line, up to 17.1kA, improves 101.2%；Induction
The resistance to thunder level of distribution line improves 146.12% up to 59.29kA under thunder.
To sum up, the single-phase mounting structure of the parallel connection gaps of 10kV distribution line of the invention, when relative to gap is not added, sense
Maximum can be improved 162.5%, 101.2% respectively for Ying Nailei and the resistance to thunder level of counterattack；Relative under three-phase mounting means, difference is most
642.25%, 313.79% is improved greatly.The inductive lightning trip-out rate of distribution line and anti-under the single-phase mounting means of parallel connection gaps
Hitting trip-out rate, maximum can reduce by 89.42%, 63.66% for three-phase mounting means respectively.And the single-phase installation of parallel connection gaps
Mode can significantly reduce the inductive lightning trip-out rate of distribution line, and maximum can reduce by 48.08%.Therefore, parallel connection gaps of the invention
Single-phase mounting structure can further increase the 10kV distribution line water of resistance to thunder on the basis of protecting the controller switching equipments such as insulator
It is flat, and its inductive lightning trip-out rate is reduced, improve the operational reliability of power distribution network.
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 single-phase mounting structure of the parallel connection gaps of 10kV distribution line characterized by comprising
In 10kV distribution line, parallel connection gaps, the adjacent diyl in left and right are only installed in a phase in a loop line road of same base shaft tower
Two parallel connection gaps of shaft tower are separately mounted to the other two-phase in three-phase, and every three base phases neighbour's shaft tower is coupled one group three simultaneously
Join gap.
2. the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to claim 1, which is characterized in that described
Parallel connection gaps are connected in parallel on insulator or insulator chain, are made of two electrodes, and an electrode is mounted on high-pressure side, an electrode
It is mounted on ground potential side, the clearance distance of the parallel connection gaps is less than the structure height of the insulator or insulator chain, described
Two electrodes are the spheric electrode of stainless steel material, and two electrodes are that ball installs the gap of ball.
3. the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to claim 1, which is characterized in that work as institute
When stating the shaft tower in 10kV distribution line and being located at lightning induced voltage influence area, the discharge voltage of the parallel connection gaps is
111.2kV；When the shaft tower in the 10kV distribution line is located at direct lightning strike influence area, the parallel connection of the parallel connection gaps installation
The discharge voltage in gap is 83.4kV.
4. the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to claim 3, which is characterized in that work as institute
When stating the shaft tower in 10kV distribution line and being located at lightning induced voltage influence area, when using the bulb diameter of electrode as 25mm, institute
The clearance distance for stating parallel connection gaps installation is 189.45mm~203.79mm, preferably 203.79mm；When the 10kV distribution wire
When shaft tower in road is located at direct lightning strike influence area, when using the bulb diameter of electrode as 25mm, between the parallel connection gaps installation
Stand-off distance is from for 147.19mm~161.14mm, preferably 147.19mm.
5. the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to claim 1, which is characterized in that described
Direct lightning strike influence area be open field and or mountain area；The lightning induced voltage influence area is except direct lightning strike influence area
Except region.
6. the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to any one of claim 1 to 5, special
Sign is that with three adjacent base shaft towers for a shaft tower group, the same 10kV matches more base shaft towers in the 10kV distribution line
The order of three parallel connection gaps of three-phase is identical in all shaft tower groups in electric line.
7. a kind of single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to any one of claim 1 to 6
Test method, which comprises the following steps:
The single-phase mounting structure for installing the parallel connection gaps in 10kV distribution line is simulated in simulation software, is emulated, is obtained
The indirect lightning strike trip-out rate of 10kV distribution line under to the inductive lightning and direct lightning strike of the single-phase mounting structure of parallel connection gaps and
Counterattack trip-out rate under direct lightning strike.
8. the test method of the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to claim 7, special
Sign is, the indirect lightning strike trip-out rate n1It is calculated by following formula:
n1=NP1η (1)
In formula (1): N is the number being struck by lightning every year around certain certain length distribution line, P1It is greater than counterattack for amplitude of lightning current
The probability of the resistance to horizontal I of thunder, η is probability of sustained arc；
Counterattack trip-out rate n under the direct lightning strike2It is calculated by following formula:
n2=N1P1gη (2)
In formula (2): N1For the number that certain certain length distribution line is struck by lightning every year, P1It is resistance to be greater than counterattack for amplitude of lightning current
The probability of the horizontal I of thunder, η are probability of sustained arc, g be thunder and lightning hit distribution line shaft tower hit bar rate.
9. the test method of the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to claim 8, special
Sign is that the probability of sustained arc η calculation formula is as follows:
η=4.5E0.75- 14 (%) (3)
In formula (3): E is the average operation electric potential gradient of insulator, unit kV/m；In 10kV distribution line,
In formula (4): UNFor route voltage rating, unit kV；l1For the arcing distance or parallel connection gaps arcing distance of insulator,
Unit is m；l2For the wire spacing of cross-arm route, unit m.
10. the test method of the single-phase mounting structure of the parallel connection gaps of 10kV distribution line according to claim 8, special
Sign is that amplitude of lightning current is greater than the probability P for striking back the resistance to horizontal I of thunder1Calculation formula is as follows:
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