CN106383274A - Transmission line insulator electrification detection method - Google Patents
Transmission line insulator electrification detection method Download PDFInfo
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- CN106383274A CN106383274A CN201610808169.9A CN201610808169A CN106383274A CN 106383274 A CN106383274 A CN 106383274A CN 201610808169 A CN201610808169 A CN 201610808169A CN 106383274 A CN106383274 A CN 106383274A
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- electric field
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- transmission line
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/12—Measuring electrostatic fields or voltage-potential
- G01R29/14—Measuring field distribution
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
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Abstract
The present invention discloses a transmission line insulator electrification detection method. The method can rapidly and conveniently locate insulators and accurately detect the insulators. The method comprises: measuring the electric field value of the umbrella skirt edge of an insulator chain to obtain an electric field sequence; solving the local electric field minimal value and marking numbers of the minimal value in order, wherein the minimal value serial numbers are the insulator chain umbrella skirt serial numbers; and taking the minimal value serial numbers as a horizontal axis, and taking the minimal value as a vertical axis, and drawing an electric field distribution curve so as to employ the current electric field method diagnostic technology to determine whether the insulators have the conduction defects. The transmission line insulator electrification detection method can identify the insulator umbrella skirt through the local electric field minimal value and provides the position information of measured points for the axial direction electric field curve of the electric field method so as to overcome the defects that the current electric field method detection instrument cannot accurately identify the defects of the insulator umbrella skirt and take the minimal value electric field as an insulator feature electric field, and the drawn electric field distribution curve can more accurately and reliably detect defect insulators.
Description
Technical field
The invention belongs to power equipment running status maintenance field, it is related to insulator condition monitoring, more particularly, to one
Plant transmission line insulator live detection method.
Background technology
Faulty insulator is detected based on electric field method, only needs electric field probe to slip over insulator chain surface, around detection insulator
Electric field, measurement is convenient, cost is relatively low, is one of important method of high-voltage transmission line insulator string disordered insulator detection.
The Electric Field Distribution curve that it is critical only that acquisition insulator chain of electric field method detection.In putting into practice at the scene, this curve
Vertical coordinate is the axial electric field of measured point, and abscissa is the positional information of measured point.Existing electric field method insulator detector, will
The edge of insulator umbrella as measured point, when the edge sense circuit in detector monitors that detector has slipped over a full skirt
When, trigger electric field sensing circuits, record the Electric Field Numerical of this position.Limited by factors such as cost, volumes, existing electric field
The form that method insulator detector blocks typically by proximity switch or light judges whether detector slips over full skirt side
Edge.But in surveying at the scene, it is due to following factors, few when many during the electric field data amount lead to edge positioning to be forbidden, detecting,
Cause the change of shape of electric field curve, have a strong impact on the implementation result of electric field method, frequently result in the diagnostic result of mistake：
（1）The full skirt quantity of insulator and diameter are changeable, and the full skirt of a certain class diameter is likely to be at edge sense circuit and can survey model
On the border enclosed.When detector slides along insulator chain surface, this class full skirt can not very stably be detected；
（2）There is mechanical shaking in detector in sliding process, measurement same full skirt may be repeated several times；
（3）The light detectors of the external light influence detector such as sunlight, lead to judge full skirt edge by accident.
It can be seen that, the key issue improving transmission line of electricity disordered insulator detection efficiency is that the measured point solving in electric field method is fixed
Position problem, i.e. full skirt identification problem.
Present invention aim to address above-mentioned the deficiencies in the prior art, improve transmission line of electricity disordered insulator detection efficiency.
The invention provides a kind of transmission line insulator live detection method, using this detection method can convenient and accurate to exhausted
Edge full skirt edge carries out fixation and recognition, relatively reliable can detect insulator conductive defect exactly.
Operation principle of the present invention is that there is minimizing feature identification absolutely using insulator umbrella internal field's distribution nearby
Edge full skirt position, and this minimum electric field is drawn electric field curve to judge whether insulator deteriorates as feature electric field.Send out
After a person of good sense is to insulator umbrella surface electric field distribution law-analysing, find there is electric field in insulator umbrella edge subrange
Minimum, minimum electric field location is corresponding with insulator umbrella simultaneously.Number is surveyed by ANSYS software Electric Field Simulation and laboratory
It is confirmed that this internal field minimizing phenomenon.It is known that the relative dielectric constant impact space electric field of insulant
Distribution.Due to the difference of insulator umbrella and air relative dielectric constant, lead to the electricity near in the air insulator umbrella edge
Field can assume the feature of local minimum.The relative dielectric constant of insulator dielectric material is bigger, and minimum phenomenon is more obvious.Good
The full skirt of the full skirt of good insulator and zero resistance insulator all can cause the change of this Electric Field Distribution.Therefore, Electric Field Numerical sequence
Minimum in row is exactly the Electric Field Numerical at insulator umbrella, can identify insulator umbrella by minimum electric field location
Skirt；If being numbered by time of measuring to minimum electric field, minimum sequence number is exactly the sequence number of insulator umbrella.Inventor grinds
Study carefully discovery, with minimum serial number abscissa, minimum is vertical coordinate, and the curve drawn can reflect disordered insulator,
With existing with insulator umbrella serial number abscissa, electric field value is the diagnosis side of the curve of vertical coordinate to the diagnosis rule being had
Method is consistent with criterion, and has good defect recognition ability.
Content of the invention
A kind of transmission line insulator live detection method that the present invention provides, comprises the following steps：
（1）Using parallel to insulator chain central axis and the line segment tangent with insulator umbrella edge as electric field measurement benchmark
Line；
（2）Under conditions of insulator charged, electric field probe is slipped over every insulator successively along datum line；In the mistake slided
Cheng Zhong, t at set intervals, measure and record the Electric Field Numerical of once probe present position；
（3）Apply existing minimum extraction algorithm, local minimum is asked to the Electric Field Numerical sequence obtaining, and minimum to gained
Value is numbered in chronological order；
（4）With minimum serial number abscissa, minimum is vertical coordinate, draws out Electric Field Distribution curve；
（5）According to Electric Field Distribution curve, judge insulator chain using the diagnostic method that existing electric field method detects zero resistance insulator
In whether there is faulty insulator or conductive defect.
A kind of heretofore described transmission line insulator live detection method, its described Electric Field Numerical specifically with
Insulator chain axis direction identical electric field component numerical value.
A kind of heretofore described transmission line insulator live detection method, its described a period of time t refer to by
Formula（1）The a period of time determining：
t=0.5/v (1)
Wherein t is the time, and its unit is the second；V is the translational speed of electric field probe, and its unit is centimeters per second.
The invention has the beneficial effects as follows, the present invention provide a kind of transmission line insulator live detection method it is only necessary to
Measure electric field using electric field probe it is not necessary to the related auxiliary equipment of the insulator such as switch, controlling organization edge positioning just can be real
The quick and precisely identification of existing full skirt, greatly reduces the complexity of electric field detection；The inventive method is passed through to identify local minimum
Value electric field, to identify insulator umbrella edge and to determine full skirt electric field, solves the existing repeated measurements problems of electric field measurement；
The inventive method relies on Electric Field Distribution feature to realize full skirt identification, and the distance controlling requiring nothing more than adjacent measurement points is suitable（It is not more than
0.5cm）, need not strictly control electric field probe to slip over speed during insulator umbrella, this feature makes the present invention be very suitable for
Apply and detect insulator technology in robot.A kind of electric transmission line isolator detection method proposed by the present invention be set forth herein
Insulator umbrella localization method on the basis of implement, using minimum electric field as insulation subcharacter electric field, the electricity drawn out
The curve of field distribution can more accurately and reliably detect disordered insulator.The inventive method quick, convenient and exactly be electric field
The axial electric field curve that method is used provides tested dot position information, and overcoming existing electric field method detector can not accurately identify
The deficiency of insulator umbrella；Minimum is drawn Electric Field Distribution curve as feature electric field, further increases electric field method detection
The effectiveness of defects of insulator and practicality.
Heretofore described method is applied to the insulator of charging operation, including porcelain insulator, composite insulator and glass
Insulator etc..
Brief description
A kind of implementing procedure figure of transmission line insulator live detection method that Fig. 1 provides for the present invention.
Fig. 2 is insulator schematic diagram；
In figure, 1,15 and 30 is insulator sequence number, and straight line AB is electric field measurement datum line, and near high-pressure side, B leans on side for wherein A side
Proximity ground terminal.
Fig. 3 is the good insulation substring full skirt edge axial electric field scatter chart of ANSYS software emulation gained；In figure is horizontal
Coordinate is positional information, and vertical coordinate is electric field intensity.
Fig. 4 is No. 3 insulators of ANSYS software emulation gained is that during zero resistance insulator, axial electric field distribution in full skirt edge is bent
Line chart；In figure abscissa is positional information, and vertical coordinate is electric field intensity.
Fig. 5 is insulator chain minimum Electric Field Distribution curve；
In figure curve 1 is the minimum Electric Field Distribution curve of good insulation, and curve 2 is the minimum that No. 3 is the null value edge period of the day from 11 p.m. to 1 a.m
Electric Field Distribution curve.
Specific embodiment
With reference to Figure of description, describe the specific embodiment of the present invention in detail.
Step 1：Using parallel to insulator central axis and the line segment tangent with insulator umbrella edge is as electric field measurement
Straight line AB in datum line, such as Fig. 2.
Step 2：Move electric field probe along measurement base directrix AB, the electric field component of insulator chain axial direction is surveyed
Amount（Two electric field measurement dot spacings are 0.5cm）, obtain the axial electric field sequence of values of insulator chain.By electric field sequence temporally
Serial number is 1 ... n ..., with Electric Field Numerical Serial No. abscissa, electric field data is vertical coordinate, draws and obtains as Fig. 3 and Fig. 4
Shown curve.
Step 3：Minimizing module in application LabVIEW program, seeks the minimum of Electric Field Numerical sequence.In this example, absolutely
Edge is double full skirt insulator, so every insulator has two electric field minimums, extraction altogether obtains minimum 60, and according to
Sequence number is 1-1,1-2 ..., n-1, n-2 ..., 30-1,30-2.Digitized representation insulation sequence number before "-" in numbering；“-”
Numeral below, 1 represents full skirt on the lower, and 2 represent top full skirt.The molecular insulator chain if single full skirt insulate,
Then only with insulator sequence number, minimum value sequence need to be numbered.
Step 4：With minimum serial number abscissa, minimum is vertical coordinate, draws out Electric Field Distribution curve.In this example,
Numeral before minimalization numbering "-"（I.e. insulator sequence number）As abscissa, n-1 ... the 29-1 that takes numbering 1-1,2-1 ...,
The minimum electric field of 30-1, as vertical coordinate, draws the Electric Field Distribution curve obtaining Fig. 5.Likewise, if single full skirt insulation
Molecular insulator chain, then can be directly mapped with minimum sequence drafting Electric Field Distribution curve by insulator sequence number.
Step 5：According to Electric Field Distribution curve, judge whether insulator is defective.From accompanying drawing 5, curve 1 is found out, electric field is bent
The sliding no significantly V-arrangement region of linear light is it can be determined that this insulator string is good insulation substring.From accompanying drawing 5, curve 2 is found out, electricity
Obvious V-arrangement feature at No. 3 insulators in curvature of field line, is judged as that No. 3 is disordered insulator.
Apply specific embodiment in the present invention principle of the present invention and embodiment are set forth, above example
Explanation be only intended to help and understand the method for the present invention and its core concept；Simultaneously for one of ordinary skill in the art,
According to the thought of the present invention, all will change in specific embodiments and applications, in sum, in this specification
Hold and should not be construed as limitation of the present invention.
Claims (3)
1. a kind of transmission line insulator live detection method, is characterized in that, methods described includes：
（1）Using parallel to insulator chain central axis and the line segment tangent with insulator umbrella edge as electric field measurement benchmark
Line；
（2）Under conditions of insulator chain is powered, electric field probe is slipped over every insulator successively along datum line；Slide
During, t at set intervals, measure and record the Electric Field Numerical of once probe present position；
（3）Apply existing minimum extraction algorithm, local minimum is asked to the Electric Field Numerical sequence obtaining, and minimum to gained
Value is numbered in chronological order；
（4）With minimum serial number abscissa, minimum is vertical coordinate, draws out Electric Field Distribution curve；
（5）According to Electric Field Distribution curve, judge insulator chain using the diagnostic method that existing electric field method detects zero resistance insulator
In whether there is faulty insulator or conductive defect.
2. a kind of transmission line insulator live detection method according to claim 1, its described Electric Field Numerical be with
The numerical value of insulator chain axis direction identical electric field component.
3. a kind of transmission line insulator live detection method according to claim 1, its described a period of time t refers to
By formula（1）The a period of time determining：
t=0.5/v (1)
Wherein t is the time, and its unit is the second；V is the translational speed of electric field probe, and its unit is centimeters per second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610808169.9A CN106383274B (en) | 2016-09-08 | 2016-09-08 | A kind of transmission line insulator live detection method |
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| CN201610808169.9A CN106383274B (en) | 2016-09-08 | 2016-09-08 | A kind of transmission line insulator live detection method |
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| CN106383274A true CN106383274A (en) | 2017-02-08 |
| CN106383274B CN106383274B (en) | 2019-01-11 |
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| CN201610808169.9A Expired - Fee Related CN106383274B (en) | 2016-09-08 | 2016-09-08 | A kind of transmission line insulator live detection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112285495A (en) * | 2020-09-21 | 2021-01-29 | 国网辽宁省电力有限公司营口供电公司 | Electric field distribution based method for judging deterioration of insulator of power transmission line |
| CN114280384A (en) * | 2021-11-10 | 2022-04-05 | 国网浙江省电力有限公司金华供电公司 | Method for electrified detection of electrical defects of composite insulator string of overhead transmission line |
| CN116124903A (en) * | 2023-04-13 | 2023-05-16 | 广东电网有限责任公司揭阳供电局 | Defect early warning method, device, system, equipment and medium for insulator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285495A (en) * | 2020-09-21 | 2021-01-29 | 国网辽宁省电力有限公司营口供电公司 | Electric field distribution based method for judging deterioration of insulator of power transmission line |
| CN114280384A (en) * | 2021-11-10 | 2022-04-05 | 国网浙江省电力有限公司金华供电公司 | Method for electrified detection of electrical defects of composite insulator string of overhead transmission line |
| CN116124903A (en) * | 2023-04-13 | 2023-05-16 | 广东电网有限责任公司揭阳供电局 | Defect early warning method, device, system, equipment and medium for insulator |
| CN116124903B (en) * | 2023-04-13 | 2023-08-15 | 广东电网有限责任公司揭阳供电局 | Defect early warning method, device, system, equipment and medium for insulator |
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