CN104515910A - Sensor for testing harmonic electric field around UHVDC (ultrahigh voltage direct current) line insulators - Google Patents
Sensor for testing harmonic electric field around UHVDC (ultrahigh voltage direct current) line insulators Download PDFInfo
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- CN104515910A CN104515910A CN201410779033.0A CN201410779033A CN104515910A CN 104515910 A CN104515910 A CN 104515910A CN 201410779033 A CN201410779033 A CN 201410779033A CN 104515910 A CN104515910 A CN 104515910A
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Abstract
The invention discloses a sensor for testing a harmonic electric field around UHVDC (ultrahigh voltage direct current) line insulators. The sensor is characterized by comprising a conductor box, upper and lower faces of the conductor box are detachably placed on the conductor box, insulating plates and copper diaphragm plates are adhered to the upper face and the lower face of the conductor box sequentially from inside to outside, the upper and lower faces of the conductor box, the insulating plates and the copper diaphragm plates are all provided with holes allowing copper wires to penetrate through, and the copper diaphragm plates are electrodes of a capacitor sensor. The problem of live detection of ultrahigh-voltage direct-current insulators is solved, and scientific basis is provided for design and maintenance of the direct-current insulators.
Description
Technical field
The present invention relates to transmission line insulator live detection field in electric system, the capacitor sensor used when being specifically related to harmonic electric field test around extra high voltage direct current transmission line insulator.
Background technology
Along with greatly developing of direct current transportation, the quantity of the DC Insulator of hanging net operation gets more and more, and in actual use, the running environment of DC Insulator is more more severe than the running environment exchanging insulator, and the probability had an accident is higher.Show according to document announcement and correlative study, similar geographical environment, under high direct voltage effect, the metal termination burn into pollution level of insulator is all than even more serious during ac high voltage effect, and the spoilage of insulator is also higher.Wherein the corrosion of metal termination is the main cause that porcelain insulator damages, and due to polar effect, also there is Ion transfer (namely so-called Ion transfer is that the alkali metal ion in insulator moves along electric field one direction under DC electric field effect) and cause insulator electrically and the decline problem of aging of mechanical property in the porcelain insulator in direct current transportation.
The test problems of DC Insulator seems important day by day.Because run insulator enormous amount on the line, as long as and an insulator string breaks down, all power transmission failure may occur, the consequence of fault is unforeseen.Therefore, in order to find the defect that insulator exists in advance, prevent the accident caused because of the development of defect in time, it is necessary for carrying out on-line checkingi to DC line insulator.
Electric field method be a kind of insulator surrounding electric field distribution curve that utilizes to judge defect, to detect the high-voltage transmission line insulator live detection method of faulty insulator, but the difficulty of extra-high voltage direct-current electric field measurement technology far exceedes AC field.First, the signals collecting difficulty of DC electric field is large.The measurement of current DC electric field mainly contains electrooptical effect method and capacitive sensing method, and laboratory study shows, adopts the sensor directly surveying DC electric field will do small and exquisite, light, and difficulty is all very large, and result is not satisfactory; Secondly, DC electric field affects by factors such as the charged particle densities in air, filth, air humidity, polarity of voltages, is a dynamic process, and distribution is unstable, and has larger dispersiveness; Again, DC electric field is comparatively large by insulator influence of characteristic parameter, the longitudinal electric field distribution curve of good money insulator chain and the differentiation of faulty insulator not obvious.The shortcoming of DC electric field determines it and is not suitable for for carrying out on-line checkingi to DC Insulator.
Find by analysis, in actual extra high voltage direct current transmission line, voltage waveform due to current conversion station device AC is not exclusively sinusoidal wave, the voltage of DC side neither be smoothly constant direct current, but containing multiple harmonic component, therefore, the Electric Field Distribution of DC voltage and harmonic voltage is correspondingly there is along DC insulator string.When insulator chain exists inner conduction fault or null value, according to theory, DC voltage and harmonic voltage electric field all can distort at fault place, can provide the failure message of insulator.Compared with DC electric field, harmonic electric field distribution is comparatively stable, only by selfcapacity, ground capacitance, determine high-pressure conductor electric capacity, affected by environment less, and the signals collecting of harmonic electric field is comparatively easy.Therefore, can attempt utilizing DC insulator string harmonic electric field to carry out on-line checkingi to DC Insulator.
Extra high voltage direct current transmission line insulator chain harmonic electric field can be measured by the method measuring power transformation appearance, and basic thought is the voltage signal induced voltage directly modulation on probe being become alternation, and then amplifies in input amplifier.The advantage done like this has 2 points: the first can reduce the requirement to amplifier noise, easily reaches higher sensitivity; It two is decrease to the requirement of the input resistance of amplifier, demand fulfillment RC>>1/ ω, ω is the angular frequency of probe modulation signal, and R is the total input resistance of metering circuit, and C is the measuring system total capacitance except probe capacitance.
So-called power transformation capacity sensor is the measured a kind of sensor being converted to the change of selfcapacity amount.
Summary of the invention
For solving the deficiency that prior art exists, the invention discloses harmonic electric field test sensor around UHVDC line insulator, not only can realize the live detection problem to extra-high voltage direct-current insulator, and scientific basis can be provided for the design of DC Insulator and maintenance.UHVDC is writing a Chinese character in simplified form of extra-high voltage direct-current transmission.
For achieving the above object, concrete scheme of the present invention is as follows:
Harmonic electric field test sensor around UHVDC line insulator, comprise conductor box, the upper and lower surface plate of conductor box is dismountable structure, the top panel of conductor box and lower panel from inside to outside post insulcrete and copper film plate respectively successively, the upper and lower surface plate of conductor box and insulcrete, copper film plate are provided with for the hole through copper cash, and copper film plate is two pole plates of capacitive transducer.
The upper and lower surface plate of described conductor box is all fixed on conductor box body by stationary installation.Stationary installation is screw.
Described insulcrete four rounding of angle, material is epoxy resin.
Described copper film plate is the semiconductor board that one side is coated with copper film.
The material of described conductor box is aluminium.
Described copper cash is for moulding copper cash, and core is flexible cord.
The upper and lower surface plate of described insulcrete, conductor box and the length of copper film plate and wide consistent size.
On described copper film plate, the length of copper film and wide size are less than the long and wide size of copper film plate.
The size of electric capacity also has relation with the shape of capacitor, and the present invention adopts capacity plate antenna structural design, and main consideration can fully perpendicular to the axis of insulator when testing the harmonic electric field around insulator.In addition, because treatment circuit of the present invention is installed in the aluminium box of two interpolars, add the anti-jamming effectiveness of sensor, make measurement result more accurate.
Beneficial effect of the present invention:
This capacitive transducer is the special harmonic electric field testing sensor of a kind of UHV (ultra-high voltage) and extra-high voltage, effectively can obtain the harmonic electric field value around UHV (ultra-high voltage) and UHV transmission line insulator chain with it.
Accompanying drawing explanation
Fig. 1 one-piece construction schematic diagram of the present invention;
In figure, 1, plate electrode, 2, insulcrete, 3, conductor box.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, the capacitor sensor used during harmonic electric field test around extra high voltage direct current transmission line insulator, comprise conductor box 3, the upper and lower surface of conductor box 3 is dismountable is placed on conductor box 3, conductor box 3 above and from inside to outside post insulcrete 2 and copper film plate successively respectively below, the upper and lower surface of conductor box and insulcrete 2, copper film plate are provided with for the hole through copper cash, and copper film plate is two plate electrodes 1 of capacitive transducer.
The upper and lower surface of semiconductor board with aluminium box mainly separates by above-mentioned insulcrete 2, its size and aluminium box top and bottom in the same size, can complete aluminium coating box top and bottom; Semiconductor board is the lamina affixad of copper film, and size is consistent with aluminium box top and bottom and insulcrete 2, and copper film plate is sticked in its effect; Copper film size than aluminium box top and bottom and semiconductor board little, its technique is copper facing, and it act as two poles of capacitor.
Upper and lower two surfaces of aluminium box stick insulcrete 2, copper film plate respectively successively.Aluminium box upper and lower surface, insulcrete 2, copper film plate are all equipped with 1mm aperture, by two 1mm thick copper lines, this three board are cascaded respectively, and outside copper film plate by the welding of copper cash one end onboard.
During making: first process the aluminium box that has certain size size, respectively place the copper film plate of a slice in aluminium box two bottom surface, place a slice insulcrete 2 respectively between copper film plate and aluminium box, aluminium box face and copper film plate are isolated.Then two copper film plates form a plate condenser, and two copper films are two electrodes of this capacitor, have insulating medium between electrode.The circuit such as this capacitor has certain electric capacity, other amplifiers and battery are placed in conductor box 3, can well be shielded.Aluminium box is except upper and lower surface, and other four sides are disposal molding, and upper and lower surface plank and other four sides are fixed with 3M screw.
Specific embodiment: first process a conductor box 3 with the thick aluminium sheet of 2mm, its outside length is: 130mm × 58mm × 22mm, and error is within 0.2mm; Upper and lower two the surface M3 screws of box are fixed, and can dismantle respectively, and open the aperture of diameter 1mm on the surface respectively at two pieces; Then be respectively with two pieces of length and widths, height: 130mm × 58mm × 1mm, and the semiconductor board of error within 0.2mm, plate length in plank one side to be respectively: 113.5mm × 54mm × 0.5mm, and the copper film of error within 0.2mm, also to stamp the hole that diameter is 1mm respectively on 2 pieces of copper films; Next look for the insulcrete 2 that 1mm is thick, making length is respectively: 130mm × 58mm × 1mm, and two boards of error within 0.2mm, and on two boards, beat the aperture that diameter is 1mm respectively.
Be up and down two the surperficial 1mm apertures of copper cash through aluminium box of 1mm respectively with two diameters, and upper and lower for aluminium box two surfaces are fixed on other 4 faces of aluminium box, form a closed box; Then two pieces of ready-made insulcretes 2 are attached on upper and lower two surfaces of aluminium box, and allow the copper cash through aluminium box top and bottom pass two apertures of insulcrete 2; Then respectively two pieces of copper films are attached to the outside of two pieces of insulcretes 2, and allow the copper cash through aluminium sheet, insulcrete 2 also be each passed through two apertures on copper film, finally respectively two of copper cash end points are welded on the outer surface of two pieces of copper films.As shown in Figure 1, complete capacitor height is 26mm, and length is: 130mm.
Capacitance calculation formula:
C=ε S/d. (ε is the specific inductive capacity of medium between pole plate, and S is polar plate area, and d is the distance between pole plate) (formula 1)
From (formula 1), the specific inductive capacity of tested capacitance and capacitor itself, polar plate area, the distance dependent system between pole plate.Copper film plate length of the present invention: 113.5mm × 54mm × 0.5mm, and length error range is within 2mm, length, width and height are a concrete numerical range, and primarily of theory calculate and experimental data gained, its area is fixed numbers 6129mm
2, error is at 4mm
2in.It is a proprietary special numerical range.Distance between two pole plates is 26mm, and this range data derives from the statistics of theory calculate and test of many times result, is also a proprietary particular values.The side of selecting of these structural designs and data constitutes specificity of the present invention and uniqueness.
Claims (8)
- Harmonic electric field test sensor around 1.UHVDC line insulator, it is characterized in that, comprise conductor box, the upper and lower surface plate of conductor box is dismountable structure, the top panel of conductor box and lower panel from inside to outside post insulcrete and copper film plate respectively successively, the upper and lower surface plate of conductor box and insulcrete, copper film plate are provided with for the hole through copper cash, and copper film plate is two pole plates of capacitive transducer.
- 2. harmonic electric field test sensor around UHVDC line insulator as claimed in claim 1, it is characterized in that, the upper and lower surface plate of described conductor box is all fixed on conductor box body by stationary installation.Stationary installation is screw.
- 3. harmonic electric field test sensor around UHVDC line insulator as claimed in claim 1, it is characterized in that, described insulcrete four rounding of angle, material is epoxy resin.
- 4. harmonic electric field test sensor around UHVDC line insulator as claimed in claim 1, is characterized in that, described copper film plate is the semiconductor board that one side is coated with copper film.
- 5. harmonic electric field test sensor around UHVDC line insulator as claimed in claim 1, it is characterized in that, the material of described conductor box is aluminium.
- 6. harmonic electric field test sensor around UHVDC line insulator as claimed in claim 1, it is characterized in that, described copper cash is for moulding copper cash, and core is flexible cord.
- 7. harmonic electric field test sensor around UHVDC line insulator as claimed in claim 1, is characterized in that, the upper and lower surface plate of described insulcrete, conductor box and the length of copper film plate and wide consistent size.
- 8. around the UHVDC line insulator as described in claim 1 or 7, harmonic electric field test sensor, is characterized in that, on described copper film plate, the length of copper film and wide size are less than the long and wide size of copper film plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779033.0A CN104515910A (en) | 2014-12-15 | 2014-12-15 | Sensor for testing harmonic electric field around UHVDC (ultrahigh voltage direct current) line insulators |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410779033.0A CN104515910A (en) | 2014-12-15 | 2014-12-15 | Sensor for testing harmonic electric field around UHVDC (ultrahigh voltage direct current) line insulators |
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| CN104515910A true CN104515910A (en) | 2015-04-15 |
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| CN201410779033.0A Pending CN104515910A (en) | 2014-12-15 | 2014-12-15 | Sensor for testing harmonic electric field around UHVDC (ultrahigh voltage direct current) line insulators |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490273A (en) * | 2018-03-28 | 2018-09-04 | 中国科学院电子学研究所 | Electric-field sensor system based on multi-channel switch |
| CN111579889A (en) * | 2020-05-28 | 2020-08-25 | 浙江大学 | Device and method for detecting electric field intensity under extra-high voltage direct current transmission line |
| CN114062794A (en) * | 2021-10-27 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Insulator surface electric field intensity measuring device and insulator system |
-
2014
- 2014-12-15 CN CN201410779033.0A patent/CN104515910A/en active Pending
Non-Patent Citations (3)
| Title |
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| 杜勇 等: "谐波电场法在±800kV直流复合绝缘子在线检测中的应用", 《高电压技术》 * |
| 沈小军 等: "谐波电场法带电检测直流绝缘子", 《电力系统自动化》 * |
| 沈小军: "电场法在线检测直流绝缘子的可行性研究", 《电网技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490273A (en) * | 2018-03-28 | 2018-09-04 | 中国科学院电子学研究所 | Electric-field sensor system based on multi-channel switch |
| CN111579889A (en) * | 2020-05-28 | 2020-08-25 | 浙江大学 | Device and method for detecting electric field intensity under extra-high voltage direct current transmission line |
| CN111579889B (en) * | 2020-05-28 | 2021-07-06 | 浙江大学 | Device and method for detecting electric field intensity under extra-high voltage direct current transmission line |
| CN114062794A (en) * | 2021-10-27 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Insulator surface electric field intensity measuring device and insulator system |
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Application publication date: 20150415 |
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