CN203405509U - A high-voltage cable instantaneous short circuit fault current detecting apparatus designed by a Rogowski Coil - Google Patents
A high-voltage cable instantaneous short circuit fault current detecting apparatus designed by a Rogowski Coil Download PDFInfo
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- CN203405509U CN203405509U CN201320447290.5U CN201320447290U CN203405509U CN 203405509 U CN203405509 U CN 203405509U CN 201320447290 U CN201320447290 U CN 201320447290U CN 203405509 U CN203405509 U CN 203405509U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The utility model discloses a high-voltage cable instantaneous short circuit fault current detecting apparatus designed by a Rogowski Coil. The high-voltage cable instantaneous short circuit fault current detecting apparatus is mainly composed of three parts including a Rogowski Coil, a data acquiring module, and a data processing module. The data acquiring module comprises an integrator, a three-stage anti-electromagnetic-interference wave-absorbing circuit, a filtering circuit, an amplifying circuit, an A/D sampling and triggering circuit, and an A/D sampling circuit which are connected successively. The input end of the integrator is connected with the output end of the Rogowski Coil. The output end of the integrator is connected with the following filtering circuit through the three-stage anti-electromagnetic-interference wave-absorbing circuit. The core of the data processing module is an embedded single chip microcomputer. The high-voltage cable instantaneous short circuit fault current detecting apparatus is capable of detecting the amplitude and the polarity of a short circuit fault current signal, and determining which metallic sheath separating section of a high-voltage cable suffers from the short circuit fault, and determining whether a short circuit fault position is at a high-voltage line or a overhead line in the case of a high-voltage cable and overhead mixed line.
Description
Technical field
The utility model belongs to high-tension cable fault detection technique field, relates in particular to a kind of high-tension cable instantaneous short circuit fault current detection device that utilizes Luo-coil design.
Background technology
Along with the develop rapidly of China's large-and-medium size cities construction and the requirement of city planning, the scale of electric system power transmission and transformation network is also increasing, especially the high voltage power transmission and transforming network of 110kV and above grade.High-tension cable with its take up an area less, lay convenience, personal safety guarantee, power supply reliability is high, maintenance workload is few etc., and advantage is widely applied in high voltage power transmission and transforming network, now on original single Voltage Cable Lines Construction, overhead transmission line basis, developed high voltage cable-overhead line hybrid line, and application is more and more extensive.Transmission line of electricity instantaneous short circuit fault be electric system the most common be also one of maximum fault type of harm, for the single-core high-voltage cable of 110kV and above grade, this short trouble usually occurs between cable core conductor and metal sheath, after fault occurs, how to determine fast fault section, determine that high-tension cable breaks down or overhead transmission line breaks down, can shorten the malfunction elimination time, quickening restores electricity, and the safety of electric system and economical operation are had great importance.
Ultra-high-tension power transmission line mainly contains 3 kinds: a kind of is modal overhead transmission line, the uninsulated bare conductor of its general use, shaft tower by standing on ground is as holder, by insulator suspension electric energy transmitting on shaft tower for bare conductor, whole circuit is comprised of wire, aerial earth wire, insulator chain, shaft tower, earthing device etc., is used for tens of kilometers, the even above long distance powedr transmission of several hundred kilometers; Another kind is Voltage Cable Lines Construction, the single core cable that high-tension cable is generally comprised of core wire, main insulating layer, metal sheath and oversheath insulation course etc., it is the cable that adopts special processing and manufacturing to form, be embedded in underground or be laid in cable tunnel, be generally used for overhead transmission line and lay difficult area, as city or the transmission of electricity of special leap location, general distance is not long, short hundreds of rice, several kilometers of growing.Also having a kind of is exactly high voltage cable-overhead line hybrid line, and circuit mesohigh long distance power transmission accesses high-tension cable transmission of electricity while adopting overhead transmission line, circuit to enter the region that urban district or ground cannot set up pole line.
According to Code for design of cables of electric works, the metal sheath of Voltage Cable Lines Construction has 2 kinds of earthing modes: a kind of is stub cable, conventionally only has hundreds of rice, metal sheath adopts the direct ground connection in one end and the other end through gap or the mode of lightning protector ground connection, and metal sheath structure is complete from the top of cable to terminal; Another is long cable, conventionally have several kilometers, during line arrangement, metal sheath will be divided into suitable unit, and presses 3 impartial as far as possible sections of length in each unit, the insulation that isolating joint or enforcement metal level should be set is separated, with cross interconnected mode ground connection.
The device that detects at present ultra-high-tension power transmission line short trouble is mainly fault wave recording device, and it is a kind of on-line measuring device that utilizes modern power electronics technology, computer technology design.When its principle is transmission line of electricity generation instantaneous short circuit fault, can produce a transient fault current signal, this signal is the transmission of road direction along the line two ends from trouble spot, device utilization is arranged on the current transformer at circuit two ends and measures this transient fault signal, and this signal waveform is recorded, then analysis waveform feature, determine the information such as the fault phase of faulty line, circuit and fault current size, this device is in conjunction with the synchronous timing device of GRS, can position to Location the convenient line fault of getting rid of.
Although above-mentioned fault wave recording device is widely used in electric system, particularly in remote overhead transmission line, but seldom application on short distance High Voltage Cable Transmission Lines, be mainly because: 1, this measurement device precision, generally more than 1km, only cannot be used for a lot of length for the high-tension cable of hundreds of rice, 2, this device is by being arranged on the current transformer measuring circuit short-circuit current signal of 2 terminal locations of transmission line of electricity, better apart from effect for overhead transmission line for single length, but undesirable for high-tension cable-aerial mixed line effect, this is because fault current signal is different from the junction reflection coefficient of overhead transmission line at cable, waveform shape can distort, cause larger measuring error, therefore for high-tension cable-aerial mixed line, being difficult to judgement short trouble position is in Voltage Cable Lines Construction or on overhead transmission line, thereby cannot effectively carry out next step fault eliminating.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of high-tension cable instantaneous short circuit fault current detection device that utilizes Luo-coil design of simple in structure, easy for installation, processing ease, to judge fast the position of failure point of Voltage Cable Lines Construction or high-tension cable-aerial mixed line.
For solving the problems of the technologies described above, the utility model by the following technical solutions: utilize the high-tension cable instantaneous short circuit fault current detection device of Luo-coil design, mainly by Luo-coil, data acquisition module and data processing module three parts, formed; Data acquisition module comprises that connecting successively the anti-electromagnetic interference (EMI) of integrator, three grades inhales wave circuit, filtering circuit, amplifying circuit, A/D sampling trigger circuit, A/D sample circuit, integrator input end connects the output terminal of Luo-coil, and the output terminal of integrator is inhaled wave circuit through three grades of anti-electromagnetic interference (EMI) and is connected with follow-up filtering circuit; The core of data processing module is an embedded scm.
Luo-coil is retractable structure, and the nylon material skeleton that is rectangle by 2 semicircles, xsect forms, and is wound with measuring coil on skeleton.
The problem that is difficult to judge fast the position of failure point of Voltage Cable Lines Construction or high-tension cable-aerial mixed line for existing pick-up unit, inventor has designed a kind of high-tension cable instantaneous short circuit fault current detection device that utilizes Luo-coil design, its principle of work is: between the core conductor of single-core high-voltage cable and metal sheath, major insulation punctures, while being short-circuited fault, place, trouble spot produces approximately tens of milliseconds of duration, amplitude is up to the instantaneous short circuit fault current of the even tens of kilo-amperes of thousands of peaces, according to Circuit theory, fault current can flow back to by cable metal sheath the top (mains side) of high-tension cable, therefore as long as amplitude and the polarity that current sensing means of the present utility model can measure this signal is installed on cable metal sheath, which metal sheath of judgement short trouble generation high-tension cable is separated segment, for high-tension cable-aerial mixed line, can judge that short trouble position is in Voltage Cable Lines Construction or on overhead transmission line.Meanwhile, the utility model installation and removal are very convenient, during use without the metal sheath outgoing cable of disassembling high-tension cable, be adapted at laying or the Voltage Cable Lines Construction that put into operation on use.
Accompanying drawing explanation
Fig. 1 is the use constitutional diagram that the utility model utilizes the high-tension cable instantaneous short circuit fault current detection device of Luo-coil design.
Fig. 2 is the structural representation of Luo-coil in the utility model current sensing means.
Fig. 3 is the left view of Luo-coil in Fig. 2.
In figure: 1 Luo-coil, 2 data acquisition modules, 3 data processing modules, 4 integrators, 5 three grades of anti-electromagnetic interference (EMI) are inhaled wave circuit, 6 filtering circuits, 7 amplifying circuits, the 8A/D trigger circuit of sampling, 9A/D sample circuit, 10 embedded scm ，11 Surveillance center, 12 high-tension cable metal sheath outgoing cables.
Embodiment
As shown in Figures 1 to 3, the utility model utilizes the high-tension cable instantaneous short circuit fault current detection device of Luo-coil design, mainly Luo-coil 1, data acquisition module 2 and data processing module 3 three parts, consists of.Luo-coil is retractable structure, the nylon material skeleton that is rectangle by 2 semicircles, xsect forms, and is wound with measuring coil on skeleton, and 2 ends of each semicircle skeleton have screw hole, use screw 2 semicircle skeletons can be coupled together, form an integral body.Data acquisition module comprise connect successively integrator 4, three grades of anti-electromagnetic interference (EMI) are inhaled wave circuit 5, filtering circuit 6, amplifying circuit 7, A/D sampling trigger circuit 8, A/D sample circuit 9, integrator input end connects the output terminal of Luo-coil, and the output terminal of integrator is inhaled wave circuit through three grades of anti-electromagnetic interference (EMI) and is connected with follow-up filtering circuit; The core of data processing module is an embedded scm 10.
It should be noted that, high-tension cable surrounding enviroment are conventionally comparatively severe, there is very strong electromagnetic interference (EMI), there was dampness in the air, environment temperature is sometimes up to 50 about degree, work that can be reliable and stable under rugged surroundings in order to ensure device, and electronic devices and components used, integrated circuit are all by industrial rank selection, satisfied temperature scope is in the environments for use of-25 degree～85 degree, and on the input of signal and power supply, output interface, at least adopts 3 grades of anti-electromagnetic interference (EMI) to inhale wave circuits; Simultaneously described each module board use there is insulation, the coating coating of protection against the tide, anticreep, shockproof, dustproof, anticorrosion, anti-aging, resistance to corona.
During use, the Luo-coil of the utility model current sensing means is arranged on the metal sheath outgoing cable at hv cable termination head or isolating joint position, outgoing cable passes from Luo-coil center, and Luo-coil is for measuring the instantaneous short circuit fault current signal that flows through metal sheath when high-tension cable is short-circuited fault.This device adopts Luo-coil current transformer to measure the instantaneous short circuit fault current signal up to tens of kilo-amperes, there will not be traditional iron core current transformer because saturation characteristic causes measuring the situation of large electric current, Luo-coil current transformer is designed to retractable structure, during measurement, only 2 semicircle skeletons need to be fastened on high-tension cable metal sheath outgoing cable 12, making outgoing cable fasten from 2 semicircle skeletons the center of circle forming passes, then use screw that 2 semicircle skeletons are tightened to an integral body, mount and dismount very convenient, during use without the metal sheath outgoing cable of disassembling high-tension cable, in the Voltage Cable Lines Construction that is adapted at laying or has put into operation, use.In addition, use special seal gum sealing during the application of the skeleton of Luo-coil, can long period of soaking use in water, environmental suitability is very strong.
The short-circuit current signal that the integrator of data acquisition module measures for integration reduction, to obtain with the linear ratio of short-circuit current signal and to be far smaller than the simulating signal (conventionally only having tens of mV) of original signal, i.e. amplitude and polarity.Because laying environment, high-tension cable periphery there is larger electromagnetic interference (EMI), can be added in short-circuit current signal and by Luo-coil, be gathered together, anti-electromagnetic interference (EMI) is inhaled wave circuit and filtering circuit can filter the interference noise that is superimposed upon short-circuit current signal, then by the amplifying circuit short-circuit current that linear measurement by magnification is arrived in proportion, so both improve data accuracy, avoided again the misoperation of follow-up A/D sampling trigger circuit.When the fault current signal amplitude of input A/D sampling trigger circuit arrives the activation threshold value of this circuit regulation, with regard to triggering following A/D sample circuit, start sampling process, convert short-circuit current signal to digital signal, be transferred to follow-up data processing module.
Data processing module receives the short-circuit current signal data that data sampling module transmits, and calculates amplitude and the polarity of short-circuit current signal by software algorithm, then reports as required high-tension cable running state monitoring center 11.
Claims (2)
1. a high-tension cable instantaneous short circuit fault current detection device that utilizes Luo-coil design, is characterized in that mainly Luo-coil, data acquisition module and data processing module three parts, consisting of; Described data acquisition module comprises that connecting successively the anti-electromagnetic interference (EMI) of integrator, three grades inhales wave circuit, filtering circuit, amplifying circuit, A/D sampling trigger circuit, A/D sample circuit, integrator input end connects the output terminal of Luo-coil, and the output terminal of integrator is inhaled wave circuit through three grades of anti-electromagnetic interference (EMI) and is connected with follow-up filtering circuit; The core of described data processing module is an embedded scm.
2. the high-tension cable instantaneous short circuit fault current detection device that utilizes Luo-coil design according to claim 1, it is characterized in that: described Luo-coil is retractable structure, the nylon material skeleton that is rectangle by 2 semicircles, xsect forms, and is wound with measuring coil on skeleton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320447290.5U CN203405509U (en) | 2013-07-25 | 2013-07-25 | A high-voltage cable instantaneous short circuit fault current detecting apparatus designed by a Rogowski Coil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320447290.5U CN203405509U (en) | 2013-07-25 | 2013-07-25 | A high-voltage cable instantaneous short circuit fault current detecting apparatus designed by a Rogowski Coil |
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| CN203405509U true CN203405509U (en) | 2014-01-22 |
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| CN201320447290.5U Expired - Fee Related CN203405509U (en) | 2013-07-25 | 2013-07-25 | A high-voltage cable instantaneous short circuit fault current detecting apparatus designed by a Rogowski Coil |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301318A (en) * | 2015-11-04 | 2016-02-03 | 国家电网公司 | Distributed current transformer |
| CN105954627A (en) * | 2016-06-22 | 2016-09-21 | 国网上海市电力公司 | Fault determining system and method used for cable and aerial conductor hybrid line |
| CN106443344A (en) * | 2016-10-08 | 2017-02-22 | 国网浙江杭州市萧山区供电公司 | System and method for judging online short-circuit fault section of high-voltage cable |
| CN107505496A (en) * | 2017-09-28 | 2017-12-22 | 北京索弗电气科技有限公司 | A kind of current detector |
| CN109660018A (en) * | 2019-02-25 | 2019-04-19 | 国网山西省电力公司吕梁供电公司 | A kind of transmission line of electricity sensing electricity getting device based on Rogowski coil |
| CN113419099A (en) * | 2021-06-18 | 2021-09-21 | 清华大学深圳国际研究生院 | Current measuring device |
-
2013
- 2013-07-25 CN CN201320447290.5U patent/CN203405509U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105301318A (en) * | 2015-11-04 | 2016-02-03 | 国家电网公司 | Distributed current transformer |
| CN105954627A (en) * | 2016-06-22 | 2016-09-21 | 国网上海市电力公司 | Fault determining system and method used for cable and aerial conductor hybrid line |
| CN105954627B (en) * | 2016-06-22 | 2019-08-06 | 国网上海市电力公司 | A kind of breakdown judge system and method for cable and overhead line hybrid line |
| CN106443344A (en) * | 2016-10-08 | 2017-02-22 | 国网浙江杭州市萧山区供电公司 | System and method for judging online short-circuit fault section of high-voltage cable |
| CN107505496A (en) * | 2017-09-28 | 2017-12-22 | 北京索弗电气科技有限公司 | A kind of current detector |
| CN109660018A (en) * | 2019-02-25 | 2019-04-19 | 国网山西省电力公司吕梁供电公司 | A kind of transmission line of electricity sensing electricity getting device based on Rogowski coil |
| CN113419099A (en) * | 2021-06-18 | 2021-09-21 | 清华大学深圳国际研究生院 | Current measuring device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 Termination date: 20150725 |
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| EXPY | Termination of patent right or utility model |