CN109100572B - A kind of on-line monitoring method of powerline pole tower ground resistance - Google Patents
A kind of on-line monitoring method of powerline pole tower ground resistance Download PDFInfo
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- CN109100572B CN109100572B CN201810970072.7A CN201810970072A CN109100572B CN 109100572 B CN109100572 B CN 109100572B CN 201810970072 A CN201810970072 A CN 201810970072A CN 109100572 B CN109100572 B CN 109100572B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
- G01R27/205—Measuring contact resistance of connections, e.g. of earth connections
Abstract
The present invention provides a kind of on-line monitoring method of powerline pole tower ground resistance, is realized by power transmission line monitoring device, lightning location system, ground resistance on-line monitoring system, specifically includes the following steps: S1, determining whether that lightning fault occurs；S2, when lightning fault occurs, calculate the total charge dosage of the thunder-strike current；S3 simultaneously calculates separately out the discharge current quantity of electric charge on four direction；S4, the discharge current quantity of electric charge for entering ground along shaft tower direction is calculated；S5, calculate the quantity of electric charge and thunder-strike current that lightning stroke discharge current is transmitted along shaft tower direction with entering total charge dosage proportionality coefficient, judge whether ground resistance meets power grid standard.The present invention can the ground resistance of transmission tower that hits of each lightning current of real-time monitoring, avoid leading to shaft tower history ground resistance variation bring error in judgement because of factors such as insulation degradations, it can be achieved that comprehensive monitoring earth resistance of power transmission line in real time.
Description
Technical field
The present invention relates to transmission line malfunction identification field more particularly to a kind of powerline pole tower ground resistance it is online
Monitoring method.
Background technique
In the power system, for safety and requirements of one's work, it is often necessary to certain positions of electrical equipment and the earth phase
Connection, here it is ground connection.Relative to transmission line of electricity, lightning stroke is to cause the principal element of line tripping, according to incompletely statistics, transmission of electricity
Transmission line caused by lightning strike failure accounts for six ten ten to percent 4 the percent of entire transmission line of electricity tripping fault, it is therefore desirable to transmission of electricity
Route increases lightning protection measures, and is one of means important in lightning protection measures by electric power line pole tower ground connection.For transmission line of electricity
The size of the ground resistance of shaft tower, power grid have explicit stipulation, but since electric power line pole tower many places are in bad environments location, pole
Vulnerable to the influence of the factors such as soil corrosion, filth, its ground resistance is made to change, be unsatisfactory for relevant criterion, reduces line
Lightning stroke trip accident occurs for road lightning protection effect, therefore, has significance to powerline pole tower ground resistance monitoring.
Traditional pole tower ground resistance measurement method has Injection Current method, split-core type meter method, and Injection Current method is i.e. using injection electricity
The method of stream, the injection testing electric current into tower grounding net measure the voltage on size of current and grounding body, to obtain shaft tower
Ground resistance, deficiency need to arrange electric current pole and voltage pole lead, disconnect shaft tower earth stud when being measurement, increase labour
Intensity, simultaneously because the presence of the arrangement of voltage pole and electric current pole will lead to inevitable error；Split-core type meter method is infused to tradition
A breakthrough for entering current method, ground resistance, but this method requirement can be measured by clamping tower grounding body or ground line with split-core type meter
Transmission line of electricity lightning conducter is by tower direct grounding way, and each shaft tower constitutes circuit by lightning conducter, lightning conducter is not connect by tower
The route on ground is not applicable.In addition, being only shaft tower measured by the powerline pole tower ground resistance measurement method of this several quasi-tradition
The ground resistance of grounding body, and be to leak into the earth by down conductor from head of mast through lightning current known to analysis, from leading
From the perspective of letting out lightning current, need to consider the resistance of entire current by pass, rather than just the resistance of grounding body, Er Qiejie
Ground body and down conductor and lightning conducter will lean on the methods of bolt, connecting plate and welding to connect, again there are contact resistance between them,
So ground resistance should be ground connection bulk resistor, the summation of down conductor resistance and contact resistance.
According to the As-Is analysis that current power transmission overhead line structures ground resistance measures, the measurement of pole tower ground resistance at present is applicable in
Property it is not high, meanwhile, measured ground resistance considers not comprehensive, does not consider the resistance of the parts such as grounding body and down conductor
Enter, there is very strong limitation, ground resistance measurement is mostly off-line measurement mode, is gradually unsatisfactory for the need of power grid at this stage
It asks.
Summary of the invention
The purpose of the present invention is to provide a kind of on-line monitoring methods of powerline pole tower ground resistance, above-mentioned to solve
The problem of being proposed in background technique.
The present invention is achieved by the following technical solutions: a kind of on-line monitoring side of powerline pole tower ground resistance
Method realizes that the transmission line of electricity is supervised by power transmission line monitoring device, lightning location system, ground resistance on-line monitoring system
It surveys device, lightning location system, ground resistance on-line monitoring system to be mounted on same transmission line of electricity, monitoring method includes
The following steps:
S1, by the fault condition of the power transmission line monitoring device transmission line of electricity, determine whether to occur lightning fault, and
Position the specific shaft tower number when lightning fault occurs；
S2, when lightning fault occurs, thunder-strike current waveform is obtained by the lightning location system, and calculates the lightning stroke
The total charge dosage Q of electric currentz；
S3, thunder-strike current aerial drainage travelling wave signal is acquired by the ground resistance on-line monitoring system, and calculated separately out
Discharge current quantity of electric charge Q1、Q2、Q3、Q4；
S4, the discharge current quantity of electric charge Q for entering ground along shaft tower direction is calculated5；
S5, the discharge current quantity of electric charge Q for entering ground along shaft tower direction is calculated5With the total charge dosage Q of thunder-strike currentzRatio system
Number, judges whether ground resistance meets power grid standard.
Preferably, the on-line monitoring method of a kind of powerline pole tower ground resistance according to claim 1, it is special
Sign is that the power transmission line monitoring device is installed on transmission line of electricity, and the lightning location system is installed on line corridor,
The ground resistance on-line monitoring system is installed at transmission tower lightning conducter, and the power transmission line monitoring device is using distributed
Every N kilometers of structure, i.e. transmission line of electricity is equipped with power transmission line monitoring device, can obtain thunder-strike current traveling wave the wave rear time and
Lightning stroke shaft tower is positioned, the N value 15 to 20.
Preferably, when lightning fault occurs, transmission line of electricity carries out thunder by lightning conducter of the transmission tower on four direction
Hit electric current aerial drainage.
It preferably, is then lightning stroke event as wave rear time < 20us of power transmission line monitoring device detection thunder-strike current traveling wave
Barrier is then non-lightning fault as wave rear time > 20us of power transmission line monitoring device detection thunder-strike current traveling wave.
Preferably, the power transmission line monitoring device carries out fault location to lightning stroke shaft tower using both-end traveling wave positioning mode.
Preferably, the lightning location system, which is adopted, carries out Fourier integral operation for acquired thunder-strike current waveform, obtains
The total charge dosage Q of the thunder-strike currentz。
Preferably, when transmission line of electricity is by being struck by lightning, thunder-strike current by transmission tower respectively with forward direction transmission tower, after
The four lightning conducter directions and tower grounding direction connected to power transmission rod carry out aerial drainage, the ground resistance on-line monitoring system
Can acquire before flowing into after the thunder-strike current aerial drainage travelling wave signal of transmission tower, inflow to the thunder-strike current aerial drainage row of transmission tower
Wave signal, and calculated respectively by integral through the preceding quantity of electric charge Q to transmission tower1、Q2, backward transmission tower quantity of electric charge Q3、
Q4。
Preferably, the discharge current quantity of electric charge Q that ground is entered along shaft tower direction5Calculation method are as follows:
Q5=Qz-Q1-Q2-Q3-Q4。
Preferably, the discharge current quantity of electric charge Q for entering ground along shaft tower direction is calculated5With the total charge dosage Q of thunder-strike currentzRatio
Example coefficient k, is denoted as:As proportionality coefficient k >=A, then illustrate that the ground resistance meets power grid standard.
Preferably, the value range of the A be [0.1,1) constant.
Compared with prior art, what the present invention reached has the beneficial effect that:
A kind of on-line monitoring method of powerline pole tower ground resistance provided by the invention, can each thunder and lightning of real-time monitoring
The ground resistance for the transmission tower that stream is hit avoids that shaft tower history ground resistance is caused to change bring because of factors such as insulation degradations
Error in judgement is, it can be achieved that comprehensive monitoring earth resistance of power transmission line in real time, while this method physical concept is extremely clear, judges to think
Road is clear and without largely being calculated, and can effectively judge the ground resistance operating condition in electric power line pole tower.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the preferred embodiment of the present invention, for
For those of ordinary skill in the art, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of flow chart of the on-line monitoring method of powerline pole tower ground resistance provided by the invention；
Fig. 2 is thunder-strike current leakage pathway schematic diagram provided in an embodiment of the present invention.
Specific embodiment
In order to be best understood from the technology of the present invention content, be provided below specific embodiment, and in conjunction with attached drawing to the present invention do into
The explanation of one step.
Referring to Fig. 1, a kind of on-line monitoring method of powerline pole tower ground resistance, by power transmission line monitoring device,
Lightning location system, the realization of ground resistance on-line monitoring system, the power transmission line monitoring device, lightning location system, ground connection
Resistance on-line monitoring system is mounted on same transmission line of electricity, and monitoring method includes the following steps:
S1, by the fault condition of the power transmission line monitoring device transmission line of electricity, determine whether to occur lightning fault, and
Position the specific shaft tower number when lightning fault occurs；
S2, when lightning fault occurs, thunder-strike current waveform is obtained by the lightning location system, and calculates the lightning stroke
The total charge dosage Q of electric currentz；
S3, thunder-strike current aerial drainage travelling wave signal is acquired by the ground resistance on-line monitoring system, and calculated separately out
Discharge current quantity of electric charge Q1、Q2、Q3、Q4；
S4, the discharge current quantity of electric charge Q for entering ground along shaft tower direction is calculated5；
S5, the discharge current quantity of electric charge Q for entering ground along shaft tower direction is calculated5With the total charge dosage Q of thunder-strike currentzRatio system
Number, judges whether ground resistance meets power grid standard.
Specifically, power transmission line monitoring device, lightning location system, ground resistance on-line monitoring system are mounted on together
On one transmission line of electricity, the power transmission line monitoring device is installed on transmission line of electricity, and the lightning location system is installed on route
On corridor, the ground resistance on-line monitoring system is installed at transmission tower lightning conducter, and the power transmission line monitoring device is adopted
With distributed frame, i.e., every N kilometers of transmission line of electricity is equipped with power transmission line monitoring device, the N value 15 to 20, in power transmission rod
When tower is by being struck by lightning, the power transmission line monitoring device can obtain the wave rear time of thunder-strike current traveling wave, and obtain lightning stroke shaft tower
GPS information positioned；It is each that the lightning location system can display real-time time of origin, position, return stroke times of lightning stroke etc.
Kind lightning parameter, and obtain thunder-strike current waveform；The ground resistance on-line monitoring system can obtain the lightning stroke for flowing through lightning conducter
Electric current aerial drainage traveling wave.
When being struck by lightning, if when wave rear time < 20us of power transmission line monitoring device detection thunder-strike current traveling wave, it is determined that
Lightning fault occurs for transmission tower, as wave rear time > 20us of power transmission line monitoring device detection thunder-strike current traveling wave, then really
Determine transmission tower and non-lightning fault occurs.
Specifically, power transmission line monitoring device carries out fault location, method to lightning stroke shaft tower using both-end traveling wave positioning mode
Are as follows: setting lightning stroke transmission tower occur lightning fault after, from failure point to monitoring point 1 and monitoring point 2 monitor lightning stroke electricity
The time of popular wave is respectively t1、t1, the spread speed of traveling wave in the line is V, then available fault point is far from monitoring point 1
Distance and fault point are respectively as follows: far from the distance of monitoring point 2
In formula, L is transmission line of electricity total length, L1Distance for fault point far from monitoring point 1, L2It is fault point far from monitoring point 2
Distance.
Specifically, lightning location system can obtain thunder-strike current waveform when transmission tower is by being struck by lightning, count for convenience
It calculates, in the present embodiment, indicates thunder-strike current waveform with i=f (t), Fourier's calculating is carried out to the waveform, obtains electric current clock synchronization
Between integral, time of integration length be thunder-strike current waveform collected time span, by Fourier integral operation, finally
Obtain the total charge dosage Q of the thunder-strike currentz。
As shown in Fig. 2, specifically, thunder-strike current passes through I, II, III, IV, V 5 side when transmission tower is by being struck by lightning
To aerial drainage is carried out, wherein I, II direction is that the transmission line of electricity being struck by lightning passes through aerial drainage road of the lightning conducter to backward transmission tower
Diameter, III, IV direction are that the transmission line of electricity being struck by lightning passes through the leakage pathway of lightning conducter Xiang Qianxiang transmission tower, and the direction V is to meet with
To the leakage pathway in the earth direction, the ground resistance on-line monitoring system on lightning conducter can acquire the transmission tower being struck by lightning
Believe to after the thunder-strike current aerial drainage travelling wave signal of transmission tower, inflow to the thunder-strike current aerial drainage traveling wave of transmission tower before flowing into
Number, and calculated respectively by integral through the preceding quantity of electric charge Q to transmission tower1、Q2With pass through after to transmission tower the quantity of electric charge
Q3、Q4。
Therefore, by total charge dosage QzIt subtracts through the preceding quantity of electric charge Q to transmission tower1、Q2With pass through after to transmission tower
Quantity of electric charge Q3、Q4, can be obtained the discharge current quantity of electric charge that the transmission tower being struck by lightning enters ground to the earth direction i.e. shaft tower direction
Q5, calculation method are as follows:
Q5=Qz-Q1-Q2-Q3-Q4
Obtain Q5, calculate the discharge current quantity of electric charge Q for entering ground along shaft tower direction5With the total charge dosage Q of thunder-strike currentzRatio
Example coefficient k, is denoted as:As proportionality coefficient k >=A, then illustrate that the ground resistance meets power grid standard.
Preferably, in one embodiment of the invention, the value range of the A be [0.1,1) either constant, can root
It is chosen according to the difference of route and running environment.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (6)
1. a kind of on-line monitoring method of powerline pole tower ground resistance, which is characterized in that by power transmission line monitoring device,
Lightning location system, the realization of ground resistance on-line monitoring system, the power transmission line monitoring device, lightning location system, ground connection
Resistance on-line monitoring system is mounted on same transmission line of electricity, and monitoring method includes the following steps:
S1, by the fault condition of the power transmission line monitoring device transmission line of electricity, determine whether to occur lightning fault, and position
Specific shaft tower number when lightning fault occurs；
S2, when lightning fault occurs, the lightning location system adopt by acquired thunder-strike current waveform carry out Fourier integral
Operation obtains the total charge dosage Q of the thunder-strike currentz；
When S3, transmission line of electricity are by being struck by lightning, thunder-strike current by transmission tower respectively with forward direction transmission tower, backward power transmission rod
The four lightning conducter directions and tower grounding direction of connection carry out aerial drainage, and the ground resistance on-line monitoring system can acquire stream
Before entering to after the thunder-strike current aerial drainage travelling wave signal of transmission tower, inflow to the thunder-strike current aerial drainage travelling wave signal of transmission tower,
And it is calculated respectively by integral through the preceding quantity of electric charge Q to transmission tower1、Q2, backward transmission tower quantity of electric charge Q3、Q4；
S4, the discharge current quantity of electric charge Q for entering ground along shaft tower direction is calculated5, the discharge current quantity of electric charge that ground is entered along shaft tower direction
Q5Calculation method are as follows:
Q5=Qz-Q1-Q2-Q3-Q4；
S5, the discharge current quantity of electric charge Q for entering ground along shaft tower direction is calculated5With the total charge dosage Q of thunder-strike currentzProportionality coefficient k,
It is denoted as:As proportionality coefficient k >=A, then illustrate that the ground resistance meets power grid standard.
2. a kind of on-line monitoring method of powerline pole tower ground resistance according to claim 1, which is characterized in that institute
It states power transmission line monitoring device to be installed on transmission line of electricity, the lightning location system is installed on line corridor, the ground connection
Resistance on-line monitoring system is installed at transmission tower lightning conducter, and the power transmission line monitoring device uses distributed frame, i.e.,
Every N kilometers of transmission line of electricity is equipped with power transmission line monitoring device, can obtain the wave rear time of thunder-strike current traveling wave and to lightning stroke
Shaft tower is positioned, the N value 15 to 20.
3. a kind of on-line monitoring method of powerline pole tower ground resistance according to claim 1, which is characterized in that hair
When raw lightning fault, transmission line of electricity carries out thunder-strike current aerial drainage by lightning conducter of the transmission tower on four direction.
4. a kind of on-line monitoring method of powerline pole tower ground resistance according to claim 1, which is characterized in that when
It is then lightning fault when power transmission line monitoring device detects wave rear time < 20us of thunder-strike current traveling wave, when transmission line of electricity monitors
It is then non-lightning fault when device detects wave rear time > 20us of thunder-strike current traveling wave.
5. a kind of on-line monitoring method of powerline pole tower ground resistance according to claim 1, which is characterized in that institute
It states power transmission line monitoring device and fault location is carried out to lightning stroke shaft tower using both-end traveling wave positioning mode.
6. a kind of on-line monitoring method of powerline pole tower ground resistance according to claim 1, which is characterized in that institute
The value range for stating A is [0.1,1) constant.
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| CN109888711B (en) * | 2019-03-15 | 2021-10-08 | 广东电网有限责任公司广州供电局 | Analysis, operation and maintenance method for grounding state of 500kV power transmission line tower |
| CN111783746A (en) * | 2020-08-07 | 2020-10-16 | 国网山东省电力公司鄄城县供电公司 | Protection method and device for power transmission line tower pole and electronic equipment |
| CN111965564A (en) * | 2020-08-10 | 2020-11-20 | 国网吉林省电力有限公司白城供电公司 | Transmission tower grounding state sensing device |
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| CN201307148Y (en) * | 2008-10-10 | 2009-09-09 | 孟宪龙 | Power transmission line pole and tower ground fault monitoring and positioning device |
| CN102175936B (en) * | 2011-01-19 | 2014-02-05 | 广东电网公司电力科学研究院 | Unrestrictive expected operation life assessment method for distribution network lightning arrester under given confidence level |
| CN108008195B (en) * | 2017-11-10 | 2019-05-17 | 海南电网有限责任公司电力科学研究院 | A kind of powerline pole tower ground resistance monitoring system and its application method |
| CN108009318B (en) * | 2017-11-10 | 2019-02-12 | 海南电网有限责任公司电力科学研究院 | The emulation modelling method of ground resistance |
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Effective date of registration: 20231221 Address after: No. 23 Hairuihou Road, Longhua District, Haikou City, Hainan Province, 571100 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF HAINAN POWER GRID Co.,Ltd. Patentee after: Hainan Electric Power Industry Development Co.,Ltd. Address before: No.23, hairuihou Road, Longhua District, Haikou City, Hainan Province, 570100 Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF HAINAN POWER GRID Co.,Ltd. |