CN106771924A - A kind of utilization photoelectricity field sensor detects the detecting system and method for defects of insulator - Google Patents

A kind of utilization photoelectricity field sensor detects the detecting system and method for defects of insulator Download PDF

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Publication number
CN106771924A
CN106771924A CN201611241054.2A CN201611241054A CN106771924A CN 106771924 A CN106771924 A CN 106771924A CN 201611241054 A CN201611241054 A CN 201611241054A CN 106771924 A CN106771924 A CN 106771924A
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China
Prior art keywords
insulator
electric
sensor
photoelectricity
insulator chain
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CN201611241054.2A
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Chinese (zh)
Inventor
祝永坤
孙广
高树永
崔士刚
史文江
许大鹏
于明星
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STATE GRID INNER MONGOLIA EASTERN POWER Co Ltd
STATE GRID EAST INNER MONGOLIA ELECTRIC POWER Co Ltd
State Grid Corp of China SGCC
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STATE GRID INNER MONGOLIA EASTERN POWER Co Ltd
STATE GRID EAST INNER MONGOLIA ELECTRIC POWER Co Ltd
State Grid Corp of China SGCC
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Priority to CN201611241054.2A priority Critical patent/CN106771924A/en
Publication of CN106771924A publication Critical patent/CN106771924A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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
    • G01R31/1227Testing 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

Abstract

The invention discloses detecting system and method that a kind of utilization photoelectricity field sensor detects defects of insulator, including photoelectricity field sensor, hoistable platform and electric field measuring apparatus, the photoelectricity field sensor is arranged on the hoistable platform and is connected with the electric field measuring apparatus, and the optical electric field sensor arrangement is around insulator chain.The advantage of the invention is that:Instrument is simple, very low to the requirement of the external environments such as weather, and measurement point is more;The method of the present invention has the advantages that to be not required to contact insulator chain simultaneously, to be not required to step on tower, detection time short, and instead of part measurement work with calculating, therefore workload is smaller, is conducive to the use of operation maintenance personnel;The change of other environment temperature does not influence the judgement that insulator is deteriorated, and in the case of dry, the filth of insulator surface does not influence the judgement of insulator deterioration.

Description

A kind of utilization photoelectricity field sensor detects the detecting system and method for defects of insulator
Technical field
The present invention relates to a kind of method and system for detecting defects of insulator, and in particular to one kind utilizes photoelectricity field sensor Detect the method and system of defects of insulator.
Background technology
With modern age power industry constantly towards large-sized unit, Large Copacity and it is high-tension develop rapidly, service condition is more Harshness, ratio of defects gradually increases, and in order to ensure the safety, the economical operation that generate electricity with power transmission and transformation system, domestic and international power industry is general Higher and higher requirement is proposed all over the reliability to power equipment, as the important component of power transmission and transformation system, to insulation The on-line checking of sub- running status, defect diagonsis are particularly important.To solve the test problems of Faulty insulator, grind both at home and abroad Various detection methods are studied carefully, the conventional means of detection high voltage power transmission line composite insulator defect is respectively at present:
First, estimated with binoculars, because the size of general defect is smaller, and need to observe ability from certain angle See, it is only less reliable from ground observation, therefore it is required that tower detection is stepped on, in addition, interior insulation failure is only difficult to find by observation.
2nd, the method for another Site Detection low null value suspension insulator of ultra-high-tension power transmission line, common tool is spark fork, Two metal contacts for pitching spark during detection are overlapped with the iron pin and chapeau de fer of insulator respectively, if insulator dielectric is functional, Then insulator pressure-bearing is breakdown, produces spark discharge.Operating personnel judge whether insulator is good according to spark discharge sound, should Method is limited by background noise, it is impossible to monitor distant insulating, and the short-circuit good insulation period of the day from 11 p.m. to 1 a.m can produce danger, it is impossible to examine Survey composite insulator.
3rd, the sound wave that sonic method detection is sent by insulator shelf depreciation, its sensitivity is less than infrared imaging method.In reality In the detection process of border, often there is corona in high-pressure side gold utensil, and produced background noise can flood defects of insulator and be sent Sound wave.
4th, IR thermometry, the damage of the insulating materials caused by electric field is most relevant with temperature.Shelf depreciation, Dielectric loss or resistance loss when leakage current flows through megohmite insulant can cause insulator local temperature to raise.The method Affected by environment larger, the interference of the sun and background radiation, spectral emissivity e's is selected, and focusing situation, meteorological condition etc. can Testing result is impacted.
Therefore, it is also somewhat limited in the practical application of detection high voltage power transmission line composite insulator defect.
The content of the invention
Present invention aim to providing a kind of method of utilization photoelectricity field sensor detection defects of insulator and being System, its is simple to operate, accurate using extensive, detection.
To achieve the above object, a kind of utilization photoelectricity field sensor designed by the present invention detects the detection of defects of insulator System, including photoelectricity field sensor, hoistable platform and electric field measuring apparatus, the photoelectricity field sensor are arranged on the hoistable platform It is connected above and with the electric field measuring apparatus, and the optical electric field sensor arrangement is around insulator chain.
Further, the hoistable platform includes dead ring, insulating bar and insulating cord, and the dead ring is fixed on described exhausted The top of edge bar, one end of the insulating cord is connected through the dead ring and with the photoelectricity field sensor.
Further, each insulator umbrella edge in the probe to insulator chain of the photoelectricity field sensor away from From identical.
Used as preference, the photoelectricity field sensor is measured around insulator chain in tri- electric fields in direction of X, Y and Z simultaneously Value and synthesis tri- electric field values in direction of X, Y and Z.
A kind of method that utilization photoelectricity field sensor detects defects of insulator, comprises the following steps:
1) photoelectricity field sensor is arranged around insulator chain;
2) along insulator chain moving photoconductor field sensor, and recording light electric-field sensor is multiple pre- around insulator chain Set up an office the electric field value for measuring;
3) electric field value according to multiple presets judges the defect situation of insulator in insulator chain.
Further, the step 2 specifically,
2.1) confirm that photoelectricity field sensor arranges errorless around insulator chain;
2.2) by the first insulator full skirt of the alignment probe insulator chain high-pressure side of photoelectricity field sensor, and along insulation The high-pressure side of substring is to low-pressure end moving photoconductor field sensor, and recording light electric-field sensor is measured in multiple presets successively First electric field value;
2.3) along the low-pressure end of insulator chain to high-pressure side moving photoconductor field sensor, and recording light electric-field sensor successively In the second electric field value of multiple presets measurement;
2.4) the first electric field value of multiple presets is carried out into average computation with the second electric field value of corresponding preset respectively, Obtain the electric field value of multiple presets.
Further, the step 2.1 is specially:
2.1) photoelectricity field sensor is moved at the high-pressure side of insulator chain, whether the high-pressure side for observing insulator chain has Electric discharge or abnormal corona phenomenon, if not discharging or abnormal corona phenomenon, photoelectricity field sensor is around insulator chain Arrangement is errorless.
Used as preference, the step 3 is specially:
3) electric field value according to multiple presets draws insulator chain surrounding electric field strength distribution curve, judges insulator chain The defect situation of middle insulator, the insulator chain surrounding electric field strength distribution curve is that the electric field of insulator chain space axial direction becomes Rate curve.
Used as preference, the step 3 is specially:
3) electric field value according to multiple presets draws insulator chain surrounding electric field strength distribution curve, judges insulator chain The defect situation of middle insulator, the insulator chain surrounding electric field strength distribution curve is that the electric field of insulator chain space axial direction becomes Rate curve, the electric field value of multiple presets is entered using finite element stimulation method to the electric field distribution law of insulator chain Row simulation analysis, judge the defect situation of insulator in insulator chain.
Used as preference, the number of the preset is 13.
The advantage of the invention is that:It can be carried on the basis of Faulty insulator is far-reaching to space axial direction electric field component Go out a kind of method that axial electric field distribution situation on utilization photoelectricity field sensor measurement insulator chain surface detects Faulty insulator, Faulty insulator and its position be can interpolate that out by the change of Direct Analysis insulator chain space axial electric field.Side of the invention Method instrument is relatively simple, very low to the requirement of the external environments such as weather, and measurement point is more;The method of the present invention has not simultaneously Insulator chain need to be contacted, be not required to step on the short advantage of tower, detection time, and part is instead of with calculating and measure work, therefore work Amount is smaller, is conducive to the use of operation maintenance personnel;In addition in the method for the invention, the change of environment temperature does not influence insulation The judgement of son deterioration, in the case of dry, the filth of insulator surface does not influence the judgement of insulator deterioration.
Brief description of the drawings
Fig. 1 is use state schematic diagram of the invention;
Fig. 2 is method of the present invention step schematic diagram;
Fig. 3 is the curve schematic diagram of good insulation substring and the Electric Field Distribution relation of Faulty insulator string;
Fig. 4 is experiment and the simulation result figure for cleaning insulator chain;
Fig. 5 be as d=0.3 and 0.5m Faulty insulator position respectively to the influence schematic diagram of space axial direction electric field change rate.
In figure:Photoelectricity field sensor 1, hoistable platform 2, electric field measuring apparatus 3, insulator chain 4, dead ring 5, insulating bar 6, absolutely Edge rope 7.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings:
A kind of utilization photoelectricity field sensor as shown in Fig. 1~2 detects the detecting system of defects of insulator, including optical electric field Sensor 1, hoistable platform 2 and electric field measuring apparatus 3, the photoelectricity field sensor 1 be arranged on the hoistable platform 2 on and with it is described Electric field measuring apparatus 3 are connected, and the photoelectricity field sensor 1 is arranged in around insulator chain 4.The hoistable platform 2 includes exhausted Edge ring 5, insulating bar 6 and insulating cord 7, the dead ring 5 are fixed on the top of the insulating bar 6, and one end of the insulating cord 7 is worn Cross the dead ring 5 and be connected with the photoelectricity field sensor 1.The probe of the photoelectricity field sensor 1 is in insulator chain 4 Each insulator umbrella edge distance it is identical.The photoelectricity field sensor 1 is measured around insulator chain 4 in X, Y and Z simultaneously Three electric field values and synthesis tri- electric field values in direction of X, Y and Z in direction.
A kind of method that utilization photoelectricity field sensor detects defects of insulator, comprises the following steps:
1) photoelectricity field sensor 1 is arranged around insulator chain 4;
2) along the moving photoconductor field sensor 1 of insulator chain 4, and recording light electric-field sensor 1 is multiple around insulator chain 4 The electric field value that preset measures, the number of the preset is 13;
2.1) confirm that photoelectricity field sensor 1 is arranged around insulator chain 4 errorless:Photoelectricity field sensor 1 is moved to absolutely At the high-pressure side of edge substring 4, observe whether the high-pressure side of insulator chain 4 has electric discharge or abnormal corona phenomenon, if not discharging Or abnormal corona phenomenon, then photoelectricity field sensor 1 arranged around insulator chain 4 errorless;
2.2) by the first insulator full skirt of the high-pressure side of alignment probe insulator chain 4 of photoelectricity field sensor 1, and along exhausted The high-pressure side of edge substring 4 to low-pressure end moving photoconductor field sensor 1, and successively recording light electric-field sensor 1 in multiple presets First electric field value of measurement;
2.3) along the low-pressure end of insulator chain 4 to high-pressure side moving photoconductor field sensor 1, and recording light electric field sensing successively The second electric field value that device 1 is measured in multiple presets;
2.4) the first electric field value of multiple presets is carried out into average computation with the second electric field value of corresponding preset respectively, Obtain the electric field value of multiple presets.
3) electric field value according to multiple presets judges the defect situation of insulator in insulator chain 4:It is default according to multiple The electric field value of point draws the surrounding electric field strength distribution curve of insulator chain 4, judges the defect situation of insulator in insulator chain 4, The surrounding electric field strength distribution curve of the insulator chain 4 is the electric field change rate curve of the space of insulator chain 4 axial direction, will be multiple pre- The electric field value for setting up an office carries out simulation analysis using finite element stimulation method to the electric field distribution law of insulator chain 4, judges The defect situation of insulator in insulator chain 4.
Embodiment 1:
During detection, photoelectric sensor 1 is fixed on from the surface of insulator chain 4 by dead ring 5, insulating bar 6 and insulating cord 7 At a certain distance from, it is ensured that photoelectric sensor 1 can be synchronized with the movement with insulating cord 7, and photoelectric sensor 1 is surveyed by optical fiber with electric field Amount instrument 3 is connected.Photoelectricity field sensor 1 is a kind of sensor based on Pockels effects, and side is brilliant using the electric light of good insulation preformance Body is used as sensing element;Signal transmission passage is used as by the high optical fiber of dielectric strength, greatly simplifies its insulation system, together When without unshakable in one's determination and coil, the problems such as in the absence of magnetic saturation, ferromagnetic resonance, certainty of measurement can be improved.
A kind of principle of the method design of utilization photoelectricity field sensor detection defects of insulator of the present invention is as follows:
Fig. 3 is the curve schematic diagram of good insulation substring and the Electric Field Distribution relation of Faulty insulator string, and transverse axis is insulation The position of substring, is from left to right that, from the low-pressure end of insulator chain to high-pressure side, the longitudinal axis is electric-field intensity, it is stipulated that a song above Line is curve A, below curve be curve B;Curve B is the electric-field intensity that is calculated according to Theory of Electromagnetic Field along good exhausted Edge substring axial direction change curve, under normal circumstances the curve be it is smooth, it is " U "-shaped;Lack when insulator chain has conduction When falling into (see the circle in Fig. 3), the current potential of fault location is changed into a constant, because electric-field intensity is rate of change of the current potential along length, Therefore the electric-field intensity of fault location will be reduced suddenly, and the Electric Field Distribution curve made is also no longer smooth, but in corresponding position On have distortion, the curve A seen in Fig. 3, what curve A was presented is shaped as " centre sink, two ends rise ".
This specific embodiment simulates the practical operation situation of 220kV circuits, and added alternating voltage virtual value is 127.0kV, Analog conducting wire length 5.0m, the insulaion resistance of experiment low resistance insulator string used is 40M Ω, and Zero resistance insulator string is short using ground wire Road steel pin steel cap is simulated, probe of the short circuit ground wire back to photoelectricity field sensor during measurement.
Fig. 4 is experiment and the simulation result figure for cleaning insulator chain, and d is electric field measurement reference line or witness mark in figure To the distance of insulator chain axis.High-pressure side is followed successively by No.1~No.13 to the insulator numbering of low-pressure end.As shown in Figure 4, exist Measured value is slightly more relatively low than calculated value at most of positions, but both Changing Patterns coincide substantially.Thus prove, using limited It is feasible that first emulated computation method carries out simulation analysis to the electric field distribution law of porcelain insulating substring.
The present invention is with the axial electric field change rate σ in spacei,jAnalysis deterioration position and the shadow changed to its space electric field apart from d Ring, its expression formula is:
σi,j=Δ Ei,j,f-ΔEi,S/ΔEi
In formula:I is each insulator position;J is Faulty insulator position (i, j=1~13);F is represented containing bad Change the insulator chain of insulator;S represents good insulation substring.
Fig. 5 is that Faulty insulator position, can respectively to the influence of space axial direction electric field change rate as d=0.3 and 0.5m To find out that result of the test is basically identical with simulation result.Faulty insulator is maximum on the electric field component influence of space axial direction, measurement away from Away from more, the rate of change of its space axial electric field is smaller;When Faulty insulator is located proximate to high-pressure side, its space axial electric field becomes Rate increases, and its space electric field rate of change is minimum during positioned at insulator chain middle part and is held essentially constant;Near low-pressure end when its Space electric field rate of change increased again.As d=0.30m, field minimum rate of change is 0.13;It is minimum as d=0.50m Electric field change rate is 0.04.It can be seen that with the increase apart from d, the space electric field rate of change at Faulty insulator position gradually subtracts It is small.Sensing head apart from insulator 10cm or within, the Electric Field Distribution curve that measures is close to theoretical U-shaped distribution, Er Qiefei Ordinary light is slided.
Table 1
If table 1 is the No.11 as d=0.3m, the space axial direction electric field change rate of No.12, No.13 insulator.By table 1 Understand, when Faulty insulator any position in string, the rate of change of 3 insulator surrounding space axial electric fields of cross-arm side is basic Stabilization, and the space axial direction electric field change rate of at least 2 is more than 5.0% in 3.Based on the thought of sensitive insulator method, this It is sensitive insulator group that invention defines 3 insulators of cross-arm side, by the space axial direction electric field change for measuring this 3 insulators Rate, so that it may judge whether contain zero resistance insulator in insulator chain.Therefore, only needed for 220kV circuit suspension insulators Analyze whether 3 insulator spaces axial direction electric field change rate of low-pressure end can judge contain null value insulation in insulator chain Son.
The present invention proposes that one kind utilizes photoelectricity on the basis of Faulty insulator is far-reaching to space axial direction electric field component The method that the axial electric field distribution situation on field sensor measurement insulator chain surface detects Faulty insulator, it is exhausted by Direct Analysis The change of edge substring space axial electric field can interpolate that out Faulty insulator and its position.Method of the present invention instrument is more Simply, very low to the requirement of the external environments such as weather, measurement point is more;The method of the present invention has and is not required to contact insulator simultaneously Go here and there, be not required to step on the short advantage of tower, detection time, and part is instead of with calculating and measure work, therefore workload is smaller, is conducive to The use of operation maintenance personnel;In addition in the method for the invention, the change of environment temperature does not influence the judgement that insulator is deteriorated, In the case of dry, the filth of insulator surface does not influence the judgement of insulator deterioration.
Finally it is pointed out that above example is only the more representational example of the present invention.It is clear that the invention is not restricted to Above-described embodiment, can also there is many deformations.It is all according to technical spirit of the invention to made for any of the above embodiments any simple Modification, equivalent variations and modification, are considered as belonging to protection scope of the present invention.

Claims (10)

1. a kind of utilization photoelectricity field sensor detects the detecting system of defects of insulator, it is characterised in that:Including optical electric field sensing Device (1), hoistable platform (2) and electric field measuring apparatus (3), the photoelectricity field sensor (1) on the hoistable platform (2) simultaneously It is connected with the electric field measuring apparatus (3), and the photoelectricity field sensor (1) is arranged in around insulator chain (4).
2. a kind of utilization photoelectricity field sensor according to claim 1 detects the detecting system of defects of insulator, its feature It is:The hoistable platform (2) includes dead ring (5), insulating bar (6) and insulating cord (7), and the dead ring (5) is fixed on institute State the top of insulating bar (6), one end of the insulating cord (7) through the dead ring (5) and with the photoelectricity field sensor (1) Connection.
3. a kind of utilization photoelectricity field sensor according to claim 2 detects the detecting system of defects of insulator, its feature It is:The distance at probe to each insulator umbrella edge in insulator chain (4) of the photoelectricity field sensor (1) is identical.
4. a kind of utilization photoelectricity field sensor according to any one in claims 1 to 3 detects the inspection of defects of insulator Examining system, it is characterised in that:The photoelectricity field sensor (1) is while measure around insulator chain (4) in tri- directions of X, Y and Z Electric field value and synthesis tri- electric field values in direction of X, Y and Z.
5. a kind of method that utilization photoelectricity field sensor detects defects of insulator, it is characterised in that:Comprise the following steps:
1) photoelectricity field sensor (1) is arranged around insulator chain (4);
2) along insulator chain (4) moving photoconductor field sensor (1), and recording light electric-field sensor (1) is around insulator chain (4) The electric field value that multiple presets measure;
3) electric field value according to multiple presets judges the defect situation of insulator in insulator chain (4).
6. the method that a kind of utilization photoelectricity field sensor according to claim 5 detects defects of insulator, it is characterised in that: The step 2 specifically,
2.1) confirm that photoelectricity field sensor (1) arranges errorless around insulator chain (4);
2.2) by the first insulator full skirt of alignment probe insulator chain (4) high-pressure side of photoelectricity field sensor (1), and along exhausted The high-pressure side of edge substring (4) to low-pressure end moving photoconductor field sensor (1), and successively recording light electric-field sensor (1) in multiple First electric field value of preset measurement;
2.3) along the low-pressure end of insulator chain (4) to high-pressure side moving photoconductor field sensor (1), and recording light electric field sensing successively The second electric field value that device (1) is measured in multiple presets;
2.4) the first electric field value of multiple presets is carried out into average computation with the second electric field value of corresponding preset respectively, is obtained The electric field value of multiple presets.
7. the method that one kind according to claim 6 detects defects of insulator using photoelectricity field sensor (1), its feature exists In:The step 2.1 is specially:
2.1) photoelectricity field sensor (1) is moved at the high-pressure side of insulator chain (4), the high-pressure side of observation insulator chain (4) Whether electric discharge or abnormal corona phenomenon are had, if not discharging or abnormal corona phenomenon, photoelectricity field sensor (1) is in insulation Arrange errorless around substring (4).
8. the one kind according to any one of claim 5~7 detects the side of defects of insulator using photoelectricity field sensor (1) Method, it is characterised in that:The step 3 is specially:
3) electric field value according to multiple presets draws insulator chain (4) surrounding electric field strength distribution curve, judges insulator chain (4) defect situation of insulator in, insulator chain (4) the surrounding electric field strength distribution curve is insulator chain (4) spatial axes To electric field change rate curve.
9. the method that the one kind according to claim 8 detects defects of insulator using photoelectricity field sensor (1), its feature It is:The step 3 is specially:
3) electric field value according to multiple presets draws insulator chain (4) surrounding electric field strength distribution curve, judges insulator chain (4) defect situation of insulator in, insulator chain (4) the surrounding electric field strength distribution curve is insulator chain (4) spatial axes To electric field change rate curve, by the electric field value of multiple presets using finite element stimulation method to insulator chain (4) Electric field distribution law carries out simulation analysis, judges the defect situation of insulator in insulator chain (4).
10. the method that the one kind according to claim 9 detects defects of insulator using photoelectricity field sensor (1), it is special Levy and be:The number of the preset is 13.
CN201611241054.2A 2016-12-28 2016-12-28 A kind of utilization photoelectricity field sensor detects the detecting system and method for defects of insulator Pending CN106771924A (en)

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Publication number Priority date Publication date Assignee Title
CN112014694A (en) * 2020-08-18 2020-12-01 西安电子科技大学 System and method for measuring optical signal propagation characteristics of gas insulated switchgear

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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Application publication date: 20170531