CN103033676A - Extra-high voltage direct current insulator leakage current measuring system - Google Patents
Extra-high voltage direct current insulator leakage current measuring system Download PDFInfo
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- CN103033676A CN103033676A CN2012105351433A CN201210535143A CN103033676A CN 103033676 A CN103033676 A CN 103033676A CN 2012105351433 A CN2012105351433 A CN 2012105351433A CN 201210535143 A CN201210535143 A CN 201210535143A CN 103033676 A CN103033676 A CN 103033676A
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Abstract
The invention provides an extra-high voltage direct current insulator leakage current measuring system which comprises a measuring system remote terminal, a measuring system local terminal and a telecommunication module, wherein the telecommunication module is used for achieving data transmission between the measuring system remote terminal and the measuring system local terminal. The measuring system remote terminal comprises a first power supply unit, an insulator leakage current sensor, a high speed data acquisition card and an electric light converting unit. Leakage current signals measured by a leakage current collecting device is collected by the high speed data acquisition card, transmitted to the electric light converting unit and converted to digital optical signals. The measuring system local terminal comprises a second power supply unit, a photovoltaic conversion unit and a computer display control center. The digital optical signals are converted to digital electrical signals through the photovoltaic conversion unit and transmitted to the computer display control center to be monitored. According to the extra-high voltage direct current insulator leakage current measuring system, measuring requirements of the insulator leakage current of an extra-high voltage direct current section can be met. The extra-high voltage direct current insulator leakage current measuring system has the advantages of being high in speed, safe, reliable in measurement and the like. Filthy states of the insulator can be fast reflected, and the extra-high voltage direct current insulator leakage current measuring system is especially suitable for field environment operation.
Description
Technical field
The invention belongs to electric system UHV transmission technical field, be specifically related to a kind of extra-high voltage direct-current insulator leakage current measuring system, be specially adapted to the fast and safely measurement of insulator leakage current under the extra-high voltage strong electromagnetic environment.
Background technology
Along with the sustained and rapid development of China's industry, the increase of net capacity and the rising of grade of rated voltage, the pollution flashover accident of electric system power transmission and transformation equipment outer insulation becomes increasingly conspicuous.Because insulator runs in the different geographical environment and climatic environment throughout the year, the various particle depositions such as airborne dust, saline and alkaline, industrial fumes will form pollution layer at outer surface of insulator, under certain weather conditions, will produce shelf depreciation at insulator surface, develop into to a certain degree and will produce flashover.For the singularity of China's weather and environment, the external insulation characteristic under the abominable natural conditions such as line corona characteristic and electromagnetic environment impact and high height above sea level, icing, heavy pollution all needs to carry out deep experimental study.
The electric current that flows through the insulator surface pollution layer that insulator leakage current records when referring under the working voltage effect filthy making moist.Obviously, it is concentrated expression and the net result of voltage, weather, filthy three elements, therefore be called dynamic parameter.When voltage and weather conditions one timing, the insulator surface leakage current is directly proportional with the filthy order of severity.Insulator leakage current is significantly determined relation with existing between the pollution flashover voltage, to a great extent the filthy level of the pollution flashover voltage of estimating and forecasting insulator and evaluation insulator.
For the selection of extra high voltage direct current transmission line insulator contamination level measurement method, preferably can imitate actual conditions in the place of operation, hang up actual insulation and apply working voltage and stain discharge process in order to observe.Obviously, the leakage current method is the filthy most effectual way of research insulation, can effectively assess the insulator contamination level by the measurement to insulator leakage current, the simultaneously variation of insulator leakage current has reflected again the change procedure of insulator dirty degree, so be the most direct effective method of filth research of insulator to the research of insulator leakage current.
Summary of the invention
In order to overcome the defective of prior art, the object of the invention is to propose a kind of high speed, safe and reliable extra-high voltage direct-current insulator leakage current measuring system.
The present invention is achieved through the following technical solutions:
A kind of extra-high voltage direct-current insulator leakage current measuring system comprises:
The measuring system remote port comprises the first power supply unit, insulator leakage current sensor, high-speed data acquisition card and electrooptic switching element; Described the first power supply unit is respectively high-speed data acquisition card and electrooptic switching element power supply, described leakage current sensor links to each other with the first photoelectric conversion unit with the acquisition channel of high-speed data acquisition card respectively, described high-speed data acquisition card gathers the measured leakage current signal of leakage current collection device, and reaches described electrooptic switching element and be converted to digital optical signal;
The measuring system local side comprises the second power supply unit, photoelectric conversion unit and Computer display control center; Described the second power supply unit is photoelectric conversion unit power supply, after the digital optical signal that described photoelectric conversion unit transmits the electrooptic switching element of described remote port is converted to digital electric signal, transfers to described Computer display control center and monitors;
Remote communication module is used for realizing that the remote data between remote port and the local side transmits.
The present invention is based on the validity that the leakage current method is measured the insulator contamination state, utilizes virtual instrument technique and Fibre Optical Communication Technology, a kind of extra-high voltage direct-current insulator leakage current measuring system of proposition.Compared with prior art, the present invention has following beneficial effect:
1) this system can satisfy the measurement requirement of extra-high voltage direct-current line segment side insulator leakage current, reaches the purpose of high speed, safe and reliable real-time measurement leakage current, can also reflect in real time fast the filthy state of UHV transmission line insulator.
2) this system carries out the multichannel collecting leakage current by high-speed data acquisition card, can realize high speed acquisition and the large capacity storage of data, can also round-the-clock 24 hours monitoring leakage curent change trend.
3) this system also considers waterproof, protection against the tide and the interference of overcurrent proof field, reaches the requirement of the reliable and stable measurement of long-time all-weather outdoor, can be applicable to leakage current sensor and the design of independent electric power supply power supply unit under the field environment fully.
Description of drawings
Fig. 1 is the extra-high voltage direct-current insulator leakage current measuring system the general frame among the present invention;
Fig. 2 is the decomposition texture schematic diagram of the insulator leakage current sensor among the present invention;
Fig. 3 is the schematic internal view of the leakage current sensor among the present invention;
Fig. 4 is the first power supply unit schematic diagram among the present invention;
Fig. 5 is the connection diagram of the 24V power transfer module among the present invention;
Fig. 6 is the connection diagram of the high pressure shaft tower Segmented electrical source line among the present invention;
Among the figure, 1-insulator leakage current sensor, 2-high-speed data acquisition card, 3-the first power supply unit, 4-electrooptic switching element, 5-photoelectric conversion unit, 6-the second power supply unit, 7-Computer display control center, 8-insulator, 9-Leakage Current sensor, 10-inner conducting layer, 11-intermediate insulating layer, the 12-outer conducting layer, 13-sensor measurement unit, 14-gas-discharge tube, 15-transient voltage twin zener dioder (hereinafter to be referred as the TVS pipe), the 16-osculum.
Embodiment
Be described in further detail below in conjunction with the technical scheme of accompanying drawing to measuring system of the present invention.
As shown in Figure 1, extra-high voltage direct-current insulator leakage current measuring system of the present invention mainly comprises: insulator leakage current sensor 1, high-speed data acquisition card 2, the first power supply unit 3, electrooptic switching element 4, photoelectric conversion unit 5 and the second power supply unit 6.Wherein, leakage current sensor 1, high-speed data acquisition card 2, the first power supply unit 3 and electrooptic switching element 4 are positioned at remote port; Photoelectric conversion unit 5 and the second power supply unit 6 are positioned at local side; Transfer to photoelectric conversion unit 5 through the digital optical signal of output after electrooptic switching element 4 conversions by remote communication module and carry out opto-electronic conversion, the digital electric signal that obtains after the conversion reaches the Computer display control center 6 that is positioned at this locality by usb communication and monitors.Remote communication module comprises optical fiber, can connect electrooptic switching element 4 and photoelectric conversion unit 5 by optical fiber, realizes the remote data transmission between remote port and the local side.
Fig. 2 is the decomposition texture schematic diagram of insulator leakage current sensor, and it mainly comprises load-bearing insulator 8 to be measured and two semi-circular leakage current sensors 9, can with the edge of the bolt welding among the figure at leakage current sensor, be fixed by bolt again.Because insulator is in the field for a long time, the surface has a lot of filths, therefore first with its surperficial wiped clean; Then coat conducting resinl in the conducting ring zone, with the electric conductivity of enforced insulator and conducting ring, then pair of sensors is snapped on the umbrella sheet of insulator.Respectively there is the screw of two copper materials at place, semi-circular sensor butt end, after sensor and insulator umbrella cover develop, lock in the screw that can two semi-circular sensors of two copper screw bolts screw-ins are relative, thereby two semi-circular sensors are fixed into a complete annular leakage current sensor.Can should be fixed on the umbrella sheet of insulator by the annular leakage current sensor by metal clip.
Fig. 3 is the inner structure schematic diagram of semi-circular leakage current sensor, and each leakage current sensor 9 consists of by three-decker, is followed successively by from inside to outside: inner conducting layer 10, intermediate insulating layer 11, outer conducting layer 12.Be provided with sensor measurement unit 13 in the intermediate insulating layer 11; In this example, the resistance that sensor measurement end 13 adopts three resistances to be respectively 1k Ω, 10k Ω and 100 Ω is in series, and resistance value is bigger than normal, and this is that leakage current is almost being received the peace rank because the insulation characterisitic of insulator determines.Resistance is divided into 3 orders of magnitude, and this is that 3 grades can cover all scopes because the leakage current variation range is larger.Suffer the risk of voltage breakdown for fear of leakage current sensor, can be parallel with at the two ends of sensor measurement unit gas-discharge tube 14, also can be parallel with TVS pipe 15; In order to guarantee that the sensor measurement unit can discharge water, protection against the tide, can smear silicon rubber in outside, sensor measurement unit.All offer the osculum 16 that equidistantly distributes on the inside and outside conductive layer 10,12, purpose is in order to discharge fast the water droplet in the leakage current sensor, to prevent the deposition of rainwater.
Fig. 4 is the design of the first power supply unit, and it comprises ground 24V power transfer module, high pressure shaft tower Segmented electrical source line and 5V power transfer module.Because the insulator of surveying hangs in the air, the measuring system remote port is positioned on the crossbeam of high pressure stem cat head end, and power supply can only be carried from ground via the high pressure shaft tower.Be provided with Special distribution cabinet near the insulator, the civil power of 220V can be provided.Because the high pressure shaft tower adopts metal material, directly civil power is drawn upper boom cat head end and easily causes security incident.Therefore, utilize the method for twice step-down to realize power supply, at first, civil power is converted into the direct current of 24V through 24V power transfer module (this module is Switching Power Supply in this example), but guarantees within the human body tolerance range; Then, by high pressure shaft tower Segmented electrical source line the 24V direct current is transferred to high pressure stem cat head end; At last, through output 5V direct current after the conversion of 5V power transfer module, be high-speed data acquisition card 2 and electrooptic switching element 4 power supplies simultaneously.
Fig. 5 is ground 24V power transfer module design drawing.In order to realize round-the-clock monitorings in 24 hours of leakage current, can utilize near the power distribution cabinet of high pressure shaft tower.The 220V civil power is provided in the power distribution cabinet, through after the Switching Power Supply, output two-way 24V direct current.Comprise two power packs in the power distribution cabinet, using two power packs is in order to prevent that one of them power supply from going wrong, and another one can be used as standby functions, and that guarantees to power is uninterrupted.Output voltage easily reflects in the Switching Power Supply, and scope range of the fluctuation of voltage is larger, in order to suppress this phenomenon, the series voltage stabilizing pipe.
Fig. 6 is high pressure shaft tower Segmented electrical source line connection diagram.Whole sub power source line is 3 sections, after the waterproof plug switching, and can be to the top of high pressure stem tower.Two output terminals of Switching Power Supply join in two core male end a, b of first paragraph power lead (i.e. ground segment 22m power lead among the figure) and the power distribution cabinet, and another two cores female end c ties up on high-pressure tower tower arm; Two core male end c ' of second segment power lead (i.e. 108m power lead among the figure) down, dock with two core female end c of first paragraph power lead, another four-core male end d is up along shaft tower to the upper strata crossbeam; The four-core female end d ' of the 3rd section power lead (i.e. 36m power lead and 74m power lead among the figure) docks with the four-core male end d of second segment power lead, in addition two two core female end e, f respectively along the crossbeam North and South direction to insulator.22m first paragraph power lead docks with 108m second segment power lead two core prints, and the 3rd section power lead four-core head of 108m second segment power lead and 36m, 74m docks.For the length of saving power lead and reduce the workman shoulder pull the wire weight, taked south and north flanks from ground to the public principle of the power lead of cat head.
The sensor that is comprised of two semi-circular leakage current sensors is used for measuring the faint leakage current of insulator surface, and output signal is the voltage signal after amplifying, then through behind high-speed data acquisition card 2 Quick Acquisitions and be stored in the inner cache module.High-speed data acquisition card 2 adopts the output of USB2.0 bus, can be connected to the USB interface of electrooptic switching element.The first power supply unit 3 provides reliable and stable 5V direct current supply for high-speed data acquisition card 2 and electrooptic switching element 4 simultaneously.Local side is comprised of optical fiber communication device local side and Computer display control center.By optical fiber communication, the leakage current signal of remote port fast and safely must be transferred to local computer.At last, the experimenter uses upper computer software to realize the variation tendency of remote real-time monitoring leakage current.
High-speed data acquisition card 2 can use TIEPIE company to produce the HS4 high-speed data acquisition card, and its range ability is wide, can measure the voltage signal between the 20mV to 80V; Its acquisition precision is high, and 12bit is provided, 14bit, 16bit resolution; Its sampling rate is the highest can to 5MS/s, to cover the frequency spectrum of leakage current substantially.
Be applicable to the insulator leakage current measuring system under the extra-high voltage direct-current environment in this example, realized the remote real time monitoring of insulator surface leakage current based on virtual instrument technique and Fibre Optical Communication Technology; In addition, developing and designed the insulator leakage current sensor and the independent current source power supply unit that are suitable under the field work environment designs; This measuring system can realize the high speed acquisition of insulator leakage current signal under the extra-high voltage complex electromagnetic environment, large capacity storage and safe transmission.
The present patent application people has done detailed explanation and description in conjunction with Figure of description to embodiments of the invention; but those skilled in the art should understand that; above embodiment only is the preferred embodiments of the invention; detailed explanation is just in order to help the reader to understand better spirit of the present invention; and be not limiting the scope of the invention; on the contrary, any any improvement or modification of doing based on invention spirit of the present invention all should drop within protection scope of the present invention.
Claims (13)
1. an extra-high voltage direct-current insulator leakage current measuring system is characterized in that, this system comprises:
The measuring system remote port comprises the first power supply unit, insulator leakage current sensor, high-speed data acquisition card and electrooptic switching element; Described the first power supply unit is respectively high-speed data acquisition card and electrooptic switching element power supply, described leakage current sensor links to each other with the first photoelectric conversion unit with the acquisition channel of high-speed data acquisition card respectively, described high-speed data acquisition card gathers the measured leakage current signal of leakage current collection device, and reaches described electrooptic switching element and be converted to digital optical signal;
The measuring system local side comprises the second power supply unit, photoelectric conversion unit and Computer display control center; Described the second power supply unit is photoelectric conversion unit power supply, after the digital optical signal that described photoelectric conversion unit transmits the electrooptic switching element of described remote port is converted to digital electric signal, transfers to described Computer display control center and monitors; With
Remote communication module is used for realizing that the remote data between remote port and the local side transmits.
2. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 1, it is characterized in that: described insulator leakage current sensor comprises insulator and two semi-circular leakage current sensors; The butt end of two leakage current sensors offers respectively threaded hole, described leakage current sensor fits tightly on the umbrella cover of described insulator, and forms an annular leakage current sensor in the relative threaded hole by two leakage current sensors of screw rod screw-in.
3. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 2, it is characterized in that: described two leakage current sensors are fixed on the umbrella cover of insulator by metal clip.
4. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 2, it is characterized in that: described leakage current sensor comprises inner conducting layer, intermediate insulating layer and outer conducting layer;
The limiter protection circuit that is provided with the sensor measurement unit in the intermediate insulating layer of described leakage current sensor and is in parallel with the sensor measurement unit, described sensor measurement unit comprises each resistance of the mutual series connection of different resistance values.
5. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 4, it is characterized in that: the inside and outside conductive layer of described leakage current sensor is provided with the osculum of equidistant layout.
6. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 4, it is characterized in that: the outside of described sensor measurement unit is coated with silicon rubber, is coated with conducting resinl on the inside and outside conductive layer surface of described leakage current sensor.
7. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 4, it is characterized in that: described limiter protection circuit comprises gas-discharge tube parallel with one another and transient voltage twin zener dioder.
8. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 1, it is characterized in that: described measuring system remote port is installed on the crossbeam of high pressure stem cat head end; Described the first power supply unit comprises ground 24V power transfer module, high pressure shaft tower Segmented electrical source line and 5V power transfer module, described ground 24V power transfer module is converted to the output of 24V direct current with the 220V civil power, and by high pressure shaft tower Segmented electrical source line the 24V direct current is reached the high-pressure tower top, output 5V direct current after the conversion of 5V power transfer module is high-speed data acquisition card and the electrooptic switching element power supply of measuring system remote port simultaneously.
9. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 8, it is characterized in that: described ground 24V power transfer module is Switching Power Supply; Described ground 24V power transfer module adopts the output of two-way direct current, is used for guaranteeing the reliable and stable of power supply.
10. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 8, it is characterized in that: the output terminal of described ground 24V power transfer module is in series with stabilivolt, is used for suppressing reflection and the fluctuation of switch power source output voltage.
11. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 8 is characterized in that, described high pressure shaft tower Segmented electrical source line comprises three sections:
The first paragraph power lead has two core male ends and two core female ends, and two described two core male ends are connected with two output terminals of described ground 24V direct current module respectively, and described two core female ends are tied up on the tower arm of high pressure shaft tower;
The second segment power lead has two core male ends and four-core male end, and described two core male ends dock with two core female ends of described first paragraph power lead down, and described four-core male end makes progress to the crossbeam place of shaft tower along the high pressure shaft tower;
The 3rd section power lead has four-core female end and two core female ends, and described four-core female end docks with the four-core male end of described second segment power lead, two described two core female ends respectively along the North and South direction of crossbeam to insulator.
12. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 1, it is characterized in that: described the second power supply unit comprises power transfer module, described power transfer module is converted to the 5V direct current with the 220V civil power, is the second photoelectric conversion unit power supply of measuring system local side.
13. extra-high voltage direct-current line segment side insulator leakage current measuring system according to claim 1, it is characterized in that: the high-speed data acquisition card in the described leakage current collection device adopts the HS4 high-speed data acquisition card, it adopts the output of USB2.0 bus, is used for realizing high speed acquisition and the large capacity storage of data.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472769A (en) * | 2013-06-28 | 2013-12-25 | 国家电网公司 | Data acquisition system and monitoring system for direct-current electric field monitoring |
| CN103809017A (en) * | 2014-02-19 | 2014-05-21 | 中国北方车辆研究所 | Detecting device of 900v high voltage leakage current |
| CN103809075A (en) * | 2014-03-10 | 2014-05-21 | 国网浙江奉化市供电公司 | High voltage leakage meter |
| CN103983840A (en) * | 2014-06-11 | 2014-08-13 | 国家电网公司 | Device for monitoring leakage and corona pulse current of alternating current insulator on line and online monitoring method using device |
| CN104764983A (en) * | 2015-03-18 | 2015-07-08 | 胡妍 | Insulator detection device |
| CN105277842A (en) * | 2015-11-27 | 2016-01-27 | 国网山东省电力公司济南供电公司 | Leakage electric current sensor for electrical device and leakage electric current signal extracting method |
| CN106018492A (en) * | 2016-05-27 | 2016-10-12 | 中国南方电网有限责任公司电网技术研究中心 | Method for detecting dampness of dirt on surface of insulator, and apparatus and system thereof |
| CN106920358A (en) * | 2017-04-14 | 2017-07-04 | 国网福建省电力有限公司 | Forest fire accident alarm method based on power transmission network |
| CN106932698A (en) * | 2017-04-26 | 2017-07-07 | 三峡大学 | A kind of livewire work device of transmission line composite insulator defects detection |
| CN107831400A (en) * | 2017-10-31 | 2018-03-23 | 上海鹭江电子有限公司 | On-line direct current insulating monitoring method and system based on Remote Management of Network |
| CN110850137A (en) * | 2018-08-21 | 2020-02-28 | 西安西电高压开关有限责任公司 | Electronic transformer and data processing method |
| WO2021258488A1 (en) * | 2020-06-23 | 2021-12-30 | 南方电网科学研究院有限责任公司 | Leakage current measurement apparatus, system and method for high-voltage direct-current cable |
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| CN103472769A (en) * | 2013-06-28 | 2013-12-25 | 国家电网公司 | Data acquisition system and monitoring system for direct-current electric field monitoring |
| CN103809017A (en) * | 2014-02-19 | 2014-05-21 | 中国北方车辆研究所 | Detecting device of 900v high voltage leakage current |
| CN103809075A (en) * | 2014-03-10 | 2014-05-21 | 国网浙江奉化市供电公司 | High voltage leakage meter |
| CN103983840A (en) * | 2014-06-11 | 2014-08-13 | 国家电网公司 | Device for monitoring leakage and corona pulse current of alternating current insulator on line and online monitoring method using device |
| CN104764983A (en) * | 2015-03-18 | 2015-07-08 | 胡妍 | Insulator detection device |
| CN105277842B (en) * | 2015-11-27 | 2018-06-12 | 国网山东省电力公司济南供电公司 | A kind of power equipment leakage current sensor and leakage current signal extracting method |
| CN105277842A (en) * | 2015-11-27 | 2016-01-27 | 国网山东省电力公司济南供电公司 | Leakage electric current sensor for electrical device and leakage electric current signal extracting method |
| CN106018492A (en) * | 2016-05-27 | 2016-10-12 | 中国南方电网有限责任公司电网技术研究中心 | Method for detecting dampness of dirt on surface of insulator, and apparatus and system thereof |
| CN106920358A (en) * | 2017-04-14 | 2017-07-04 | 国网福建省电力有限公司 | Forest fire accident alarm method based on power transmission network |
| CN106932698A (en) * | 2017-04-26 | 2017-07-07 | 三峡大学 | A kind of livewire work device of transmission line composite insulator defects detection |
| CN107831400A (en) * | 2017-10-31 | 2018-03-23 | 上海鹭江电子有限公司 | On-line direct current insulating monitoring method and system based on Remote Management of Network |
| CN110850137A (en) * | 2018-08-21 | 2020-02-28 | 西安西电高压开关有限责任公司 | Electronic transformer and data processing method |
| WO2021258488A1 (en) * | 2020-06-23 | 2021-12-30 | 南方电网科学研究院有限责任公司 | Leakage current measurement apparatus, system and method for high-voltage direct-current cable |
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