CN102645572B - Voltage drop measuring device for long-distance superconducting power transmission cable - Google Patents
Voltage drop measuring device for long-distance superconducting power transmission cable Download PDFInfo
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- CN102645572B CN102645572B CN201210122612.9A CN201210122612A CN102645572B CN 102645572 B CN102645572 B CN 102645572B CN 201210122612 A CN201210122612 A CN 201210122612A CN 102645572 B CN102645572 B CN 102645572B
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Abstract
A voltage drop measuring device for a long-distance superconducting power transmission cable comprises a superconducting common conductor (1), sensing and data acquiring devices (3), time synchronization devices (4), a satellite positioning system (5), a communication network (6) and a data processing center (7). One end of the superconducting common conductor (1) is connected with a starting end of the superconducting power transmission cable (2), and the superconducting common conductor (1) is mounted on a low-temperature medium pipeline of the superconducting power transmission cable (2) to be measured. The length of the superconducting common conductor (1) is equal to that of the superconducting power transmission cable (2). A superconducting power transmission cable energized conductor (23) in the superconducting power transmission cable (2) is connected with input signals of the sensing and data acquiring devices (3). The superconducting common conductor is connected with input signals of the corresponding sensing and data acquiring device (3) at each point to be measured. The sensing and data acquiring devices (3) are connected with the time synchronization devices (4) and connected with the data processing center (7) by the communication network (6).
Description
Technical field
The present invention relates to a kind of measurement mechanism of measuring superconducting power transmission cable voltage signal.
Background technology
Superconducting power transmission cable has low-loss feature, has become the important selection of following long-distance and large-capacity power transmission.Different from traditional feeder cable, voltage drop when superconducting power transmission cable normally moves approaches 1 μ V/m, i.e. per 100 km voltage drop is about 0.1V; Traditional electric transmission copper cable voltage drop of current-carrying 1000A is about 0.2mV/m, and hundred kilometers of voltages are reduced to 20V.Because superconducting power transmission cable voltage drop is the basis that loss is calculated, and loss is the foundation of refrigeration, is also the important indicator of system performance, therefore must measure superconducting power transmission cable voltage drop.
Conventional electric power cable voltage drop is larger, can by cable end to be measured, place respectively can synchro measure sensor, the earth of usining carries out synchro measure as common point, then data return data center is processed.Compare by the time, obtain the data of synchronization different measuring point, after subtracting each other, be voltage drop.The basis of doing is like this to think that remote potential difference is greatly less, compares and can ignore with the voltage of tens volts of remote traditional feeder cables.
For remote voltage measurement, Chinese invention patent 200310120803.2 discloses a kind of earth electric field multiple tracks synchronous measuring apparatus and measuring method altogether, it mainly selects a certain position as common point ground connection between tested point, to avoid the earthy difference of diverse location, realize earth electric field two pass or multiple tracks synchro measure.But because the earth potential between each tested point and common point is also variant, for the feeble signal of microvolt level is measured, impact is also larger.Chinese invention patent 200880006352.0 discloses the system of the real-time Measurement accuracy of a kind of power line characteristic impedance, it is by voltage, electric current and the phasing degree thereof of at least two positions on synchro measure line of electric force, circuit model in conjunction with line of electric force, can obtain the real-time behavioral characteristics impedance of line of electric force, with the service efficiency of the line that increases electric power.Chinese invention patent 200780045891.0 discloses a kind of method of synchro measure estimation service time real-time electric power system quantities, it utilizes from the time signal of GPS and comes the voltage of synchronous electric power networks diverse location, electric current phasor to measure, and the state based on this to electric system is estimated.Chinese invention patent 200910105711.4 discloses a kind of power system transmission line parameter synchronic measurement and pen recorder, it is modeled as respectively different logical device according to IEC61850 standard by failure wave-recording and transmission line parameter measurement, both realized the data recording in electric power system fault situation, also realized power system transmission line parameter synchronic measurement, solved that existing power failure is measured, the artificial repeatedly asynchronous measurement data that reads causes difficult parameters with the problem of Measurement accuracy.Chinese invention patent 200910107854.9 discloses a kind of power transmission line parameter online measurement method based on failure wave-recording, it utilizes the gps clock of wave recording device to carry out synchronously, draw positive sequence voltage, the electric current at circuit two ends, thereby realize the on-line measurement of transmission line parameter.Chinese invention patent 00131107.7 discloses a kind of synchronous transient-process recording method and device, it is by the synchronous crystal oscillator of GPS, make the signal synchro measure of a plurality of pen recorders to strange land measurement point, connect into network, realize the distributed of the temporal variations processes such as power system operation, fault and disturbance and tell record and measure.
Above method be take clock as benchmark, adopt conventional measurement mechanism synchronous acquisition voltage and current equivalent, wherein voltage is voltage-to-ground, is applicable to longer-distance common power measurement, now the voltage between diverse location is much larger than earthy difference, and its error causing can be ignored.And remote earthy difference has been fallen at an order of magnitude with the terminal voltage of superconducting power transmission cable, even much larger than terminal voltage, the synchro measure that the earth potential of therefore take is above benchmark is unwell to the measurement of superconducting power transmission cable voltage drop.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, the impact of signal measurement for earth potential difference, remote superconducting power transmission cable weak voltage is fallen, provide the superconducting power transmission cable voltage drop measuring apparatus of a kind of based superconductive line as common point, the measuring error occurring because datum is inconsistent to reduce diverse location.
Measurement mechanism of the present invention comprises: superconduction common conductor, sensing and data collector, time synchronism apparatus, data processing centre (DPC), communication network.Sensing is connected with superconduction common conductor with the signal ground of data collector; After sensing is connected with time synchronism apparatus with data collector, then be connected with data processing centre (DPC) by communication network.
Described superconduction common conductor is arranged in the cryogenic media pipeline of superconducting power transmission cable to be measured, install with superconducting power transmission cable to be measured is parallel: one end of superconduction common conductor is connected with the initiating terminal of superconducting power transmission cable to be measured, and installs along same paths with superconducting power transmission cable.The length of described superconduction common conductor equates with superconducting power transmission cable to be measured.Superconduction common conductor is connected with the signal ground of data collector with sensing at each tested point.Because superconduction common conductor has zero resistance characteristic, and the electric current passing through is the measuring-signal of voltage sensor or mutual inductor, is generally 1mA magnitude, and hundred kilometers of voltage drops are also no more than 1 μ V, much smaller than ground potential difference, also much smaller than voltage signal to be measured.Therefore, at each tested point of superconducting power transmission cable, superconduction common conductor is connected with the signal ground of data collector with sensing, can provides common point for voltage measurement at a distance.
The quantity of the section that described sensing need to be measured with superconducting power transmission cable to be measured with the quantity of data collector equates, as the voltage drop that will measure N section superconducting power transmission cable, need N sensing and data collector, N sensing and data collector are arranged on respectively N tested point.The data acquisition trigger pip of each sensing and data collector is provided by time synchronism apparatus, and each sensing and data collector are sent to data processing centre (DPC) by communication network after the data of collection are carried out to time tag.Each sensing is connected with superconduction common conductor with data collector signal ground.
The quantity of described time synchronism apparatus equates with the quantity of data collector with sensing, and each tested point is all equipped with a time synchronism apparatus.Described time synchronism apparatus is communicated by letter with data collector with sensing, and each time synchronism apparatus receives the backward sensing of external command and data collector provides synchronous acquisition trigger pip.The clock reference of time synchronism apparatus can be provided by itself, also can be provided by satellite clock.
Described data processing centre (DPC) is industrial computer, need to have larger data storage capacity and stronger data-handling capacity.Sensing is all connected with data processing centre (DPC) by communication network with time synchronism apparatus with data collector.
Described communication network tie-time synchronous device, sensing and data collector and data processing centre (DPC).Communication network can be selected wired or wireless communication mode according to actual conditions.
Measuring process of the present invention comprises the following steps:
(1) described superconduction common conductor is installed in the cryogenic piping of superconducting power transmission cable to be measured;
(2) at each tested point, sensing and data collector are installed, and its signal ground is connected with superconduction common conductor;
(3), at each tested point set-up time synchronous device, its clock sync signal output is connected with data collector measurement triggering signal with the sensing of this tested point;
(4) by communication network, connect each sensing and data collector and time synchronism apparatus and data processing centre (DPC);
(5) each time synchronism apparatus of Data processing mind-set sends instruction, makes each time synchronism apparatus to sensing and data collector, provide data acquisition trigger pip at synchronization;
(6) each data acquisition system (DAS) sends to data processing centre (DPC) by the data with time ruler that gather by communication network;
(7) data processing centre (DPC) compares according to the time ruler of each data, obtains mutually the data that each sensing and data collector collect in the same time;
(8) according to the data of synchronization superconducting power transmission cable to be measured two ends sensing and data collector collection, by subtracting each other, can obtain voltage drop to be measured.
Measurement mechanism of the present invention, by increasing subsidiary superconduction common conductor in the cryogenic media environment in superconducting power transmission cable inside as common point, avoid current power system to take the earth as the earth potential difference that common point was brought, and then improve the measuring accuracy to superconducting power transmission cable voltage drop.
Accompanying drawing explanation
Fig. 1 is measurement mechanism schematic diagram of the present invention, in figure: 1 superconduction common conductor, 2 superconducting power transmission cables, 3 sensings and data collector, 4 time synchronism apparatus, 5 global position systems, 6 communication networks, 7 data processing centre (DPC)s;
Fig. 2 is superconducting power transmission cable and superconduction common conductor structural relation schematic diagram, in figure: 1 superconduction common conductor, 2 superconducting power transmission cables, 21 superconducting power transmission cable protective sleeves, 22 superconducting power transmission cable Dewar pipes, 23 superconducting power transmission cable electrical conductors.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.
As shown in Figure 1, voltage drop measuring apparatus of the present invention comprises superconduction common conductor 1, sensing and data collector 3, time synchronism apparatus 4, global position system 5, communication network 6 and data processing centre (DPC) 7.Superconducting power transmission cable 2 is for delivery of electric energy, and the present invention is for measuring in real time superconducting power transmission cable 2 in the voltage drop of diverse location.
In the present embodiment, need to measure the voltage drop of 2 three relative starting points of diverse location of superconducting power transmission cable, need respectively three cover sensings and data collector 3 and time synchronism apparatus 4.Superconduction common conductor 1 is as the common point of different measuring position.The amount of measuring due to needs be diverse location to the voltage difference of superconducting power transmission cable 2 initiating terminals, therefore one end of superconduction common conductor 1 is connected with the initiating terminal of superconducting power transmission cable 2, and installs along same paths with superconducting power transmission cable 2.Fig. 1 is only convenient for representing, superconducting power transmission cable 2 and superconduction common conductor 1 are separately drawn, and in fact the present invention utilizes the cryogenic media pipeline of superconducting power transmission cable 2 inside, and superconduction common conductor 1 is placed in to cryogenic media pipeline.During due to voltage measurement, its input impedance is much larger than tested electric system, so the electric current of flowing through on superconduction common conductor 1 is minimum, therefore its thermal value and loss are very little, can not impact normal electric power and liquid nitrogen transmission.In measuring process, superconduction common conductor 1 is all the time in superconducting state, and electric current is minimum, so its voltage drop compares measurand and can ignore, and in the scope allowing, can think that whole superconduction common conductor 1 is in equipotential state in error.Based on this, the common point using superconduction common conductor 1 as synchro measure.Figure 1 shows that at three points adopts weak voltage signals sensing to measure superconducting power transmission cable 2 in the voltage drop of this relative initiating terminal in position with data collector 3.Each sensing is connected with superconduction common conductor 1 with the signal ground of data collector 3, and data acquisition trigger pip is provided by time synchronism apparatus 4.Sensing is connected with data processing centre (DPC) 7 by communication network 6 with data collector 3, by being sent to data processing centre (DPC) 7 after the data increase time tag of collection, processes.Time synchronism apparatus 4 can both can have been selected local clock or high-frequency clock cable synchronizing for synchro measure provides reference clock, also can adopt the time service function of global position system 5 to carry out synchronously.The present embodiment adopts global position system 5 to provide synchro measure signal for time synchronism apparatus 4.Each time synchronism apparatus 4 is connected with data processing centre (DPC) 7 by communication network 6, and be connected with data collector 3 with the sensing of place tested point respectively, and according to the instruction of data processing centre (DPC) 7, synchronized transmission data acquisition trigger pip is to sensing and data collector 3, thereby makes the signal that each sensing and data collector 3 can synchronous acquisition position.Due to global position system 5 provide for standard time clock, sensing and data collector 3 by record data back data processing centre (DPC) 7 time, by sensing and data collector 3, in packet, add standard time clock and identify, thereby data processing centre (DPC) 7 can mate carrying out clock from different sensings with the data of data collector 3.Through oversampling clock matching treatment with after analyzing, in conjunction with the model of superconducting power transmission cable 2, can obtain the voltage drop of a certain moment superconducting power transmission cable 2.Far and near according to the geographical environment of superconducting power transmission cable 2 processes and distance, communication network 6 can be selected wireless or wired form, adopts in the present embodiment wired mode.7 of time synchronism apparatus 4, communication network 6 and data processing centre (DPC)s and sensing, are not directly connected with superconducting power transmission cable 2 by being connected after electrical isolation with data collector 3.
As shown in Figure 2, the basic composition of superconducting power transmission cable 2 comprises superconducting power transmission cable protective sleeve 21, superconducting power transmission cable Dewar pipe 22 and superconducting power transmission cable electrical conductor 23.Superconduction common conductor 1 and superconducting power transmission cable 2 are coaxially installed.At each tested point, adopt voltage lead that the signal of the inner superconducting power transmission cable electrical conductor 23 of superconducting power transmission cable 2 and superconduction common conductor 1 is drawn, using the signal of the superconducting power transmission cable electrical conductor 23 of drawing as sensing and the input signal of data collector 3, using the signal of the superconduction common conductor 1 of drawing as sensing and the input signal of data collector 3 ground.Superconduction common conductor 1 is positioned at superconducting power transmission cable Dewar pipe 22 inside.Wherein superconducting power transmission cable protective sleeve 21 is positioned at the outermost of superconducting power transmission cable 2, for the protection of superconducting power transmission cable 2, in the processes such as manufacture, transportation, installation, does not suffer damage.As shown in Figure 2, superconducting power transmission cable Dewar pipe 22 is positioned at superconducting power transmission cable protective sleeve 21 inside, the hollow cylinder inner and outer wall of superconducting power transmission cable Dewar pipe 22 is divided into two hollow cavitys by the inner space of superconducting power transmission cable 2: as shown in Figure 2, first hollow cavity that superconducting power transmission cable Dewar pipe 22 is divided is the hollow cylindrical chamber forming between superconducting power transmission cable Dewar pipe 22 inner and outer walls, superconducting power transmission cable electrical conductor 23 is arranged in hollow cylindrical chamber, during use, in inside, hollow cylindrical chamber, be full of cryogenic media, cryogenic media flows along transmission of electricity direction in hollow cylindrical chamber, be used to superconducting power transmission cable electrical conductor 23 that cold operation environment is provided, as shown in Figure 2, second hollow cavity that superconducting power transmission cable Dewar pipe 22 is divided is the hollow cylinder pipeline that superconducting power transmission cable Dewar pipe 22 inwalls form, the cryogenic media of the inside, hollow cylindrical chamber between superconducting power transmission cable Dewar pipe 22 inner and outer walls arrives after the terminal of superconducting power transmission cable 2, then by hollow cylinder pipeline, is back to the cryogenic refrigeration station of superconducting power transmission cable 2 starting points.1 of superconduction common conductor is arranged in the hollow cylinder pipeline of superconducting power transmission cable Dewar pipe 22 inwalls formations, and the low temperature environment that the cryogenic media that utilization refluxes provides makes superconduction common conductor 1 in superconducting state.Cryogenic refrigeration erect-position is in the starting point of superconducting power transmission cable, first the cryogenic media after pressurization is injected to the hollow cylindrical chamber forming between described superconducting power transmission cable Dewar pipe 22 inner and outer walls, the heat that cryogenic media produces superconducting power transmission cable electrical conductor 23 in flow process is taken away; Cryogenic media enters in the hollow cylinder pipeline that superconducting power transmission cable Dewar pipe 22 inwalls form the terminal that arrives superconducting power transmission cable 2 is laggard, is back to cryogenic refrigeration station.Cryogenic media turns back to behind cryogenic refrigeration station, then by the cryocooled of inside, cryogenic refrigeration station, refills in the hollow cylindrical chamber forming between described superconducting power transmission cable Dewar pipe 22 inner and outer walls, recycles thus cryogenic media.
The present invention uses superconduction common conductor 1 as the common point of remote superconducting power transmission cable 2 voltage drop synchro measures, a kind of remote superconducting power transmission cable 2 voltage drop synchronous measuring apparatus are proposed, solved the problem of remote feeble signal high-acruracy survey, for superconduction long distance power transmission quality of power supply high-acruracy survey provides basis.
Claims (6)
1. a remote superconducting power transmission cable voltage drop measuring apparatus, described measurement mechanism comprises sensing and data collector (3), communication network (6) and data processing centre (DPC) (7), described sensing is connected with data processing centre (DPC) (7) by communication network (6) with data collector (3), it is characterized in that, described measurement mechanism also comprises superconduction common conductor (1), time synchronism apparatus (4) and global position system (5); One end of described superconduction common conductor (1) is connected with the initiating terminal of described superconducting power transmission cable (2), and along same paths, is arranged in the cryogenic media pipeline of superconducting power transmission cable to be measured (2) with superconducting power transmission cable; The length of described superconduction common conductor (1) and described superconducting power transmission cable (2) equal in length; The other end of described superconduction common conductor (1) is connected with the signal ground of data collector (3) with sensing; Described sensing is connected with time synchronism apparatus (4) with data collector (3); Described time synchronism apparatus (4) is communicated by letter with data collector (3) with sensing; Sensing is connected with superconducting power transmission cable (2) by voltage lead with data collector (3).
2. measurement mechanism according to claim 1, it is characterized in that, described sensing needs the quantity of the section of measurement to equate with the quantity of data collector (3) with described superconducting power transmission cable (2), at each tested point of described superconducting power transmission cable (2), a sensing and data collector (3) is installed.
3. measurement mechanism according to claim 1, it is characterized in that, the quantity of described time synchronism apparatus (4) equates with the quantity of data collector (3) with sensing, at each tested point of described superconducting power transmission cable (2), a time synchronism apparatus (4) is installed.
4. measurement mechanism according to claim 1, it is characterized in that, the data acquisition trigger pip of described sensing and data collector (3) is provided by time synchronism apparatus (4), and sensing and data collector (3) are sent to data processing centre (DPC) (7) by communication network (6) after the data that gather are added to time tag.
5. measurement mechanism according to claim 1, it is characterized in that, adopt voltage lead that the superconducting power transmission cable electrical conductor (23) of superconducting power transmission cable (2) inside and the signal of superconduction common conductor (1) are drawn, using the signal of the superconducting power transmission cable electrical conductor (23) of drawing as sensing and the input signal of data collector (3), the input signal ground using the signal of the superconduction common conductor (1) of drawing as sensing and data collector 3.
6. measurement mechanism according to claim 1, is characterized in that, described superconduction common conductor (1) is arranged in the hollow cylinder pipeline being surrounded by superconducting power transmission cable Dewar pipe (22) inwall; The superconducting power transmission cable electrical conductor (23) of described superconducting power transmission cable (2) is arranged in the hollow cylindrical chamber between superconducting power transmission cable Dewar pipe (22) inner and outer wall; Inside, hollow cylindrical chamber is full of cryogenic media, and cryogenic media flows along transmission of electricity direction in hollow cylindrical chamber, for described electrical conductor (23) provides cold operation environment; The cryogenic media of inside, hollow cylindrical chamber arrives after the terminal of superconducting power transmission cable (2), by hollow cylinder pipeline, be back to the cryogenic refrigeration station of superconducting power transmission cable (2) starting point, the low temperature environment that the cryogenic media that utilization refluxes provides makes superconduction common conductor (1) in superconducting state again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210122612.9A CN102645572B (en) | 2012-04-24 | 2012-04-24 | Voltage drop measuring device for long-distance superconducting power transmission cable |
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| CN201210122612.9A CN102645572B (en) | 2012-04-24 | 2012-04-24 | Voltage drop measuring device for long-distance superconducting power transmission cable |
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| CN102645572A CN102645572A (en) | 2012-08-22 |
| CN102645572B true CN102645572B (en) | 2014-07-30 |
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| US11660695B2 (en) * | 2017-03-09 | 2023-05-30 | Illinois Tool Works Inc. | Welding power supplies, wire feeders, and systems to measure a weld cable voltage drop |
Citations (5)
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| CN2155024Y (en) * | 1993-03-30 | 1994-02-02 | 陈恺 | Controlled cable corrector |
| CN2379794Y (en) * | 1999-08-03 | 2000-05-24 | 朱定国 | Steel wire cable for thermistor instrument for measuring grain temp. |
| JP2005151727A (en) * | 2003-11-18 | 2005-06-09 | Furukawa Electric Co Ltd:The | Method of measuring critical current of superconducting cable line |
| CN1725386A (en) * | 2004-07-20 | 2006-01-25 | Y.Y.L株式会社 | DC superconducting feeding cable and feeding system |
| CN1961385A (en) * | 2005-01-13 | 2007-05-09 | Ls电线有限公司 | Superconducting power cable capable of quench detection and quench detection system using the same |
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2012
- 2012-04-24 CN CN201210122612.9A patent/CN102645572B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2155024Y (en) * | 1993-03-30 | 1994-02-02 | 陈恺 | Controlled cable corrector |
| CN2379794Y (en) * | 1999-08-03 | 2000-05-24 | 朱定国 | Steel wire cable for thermistor instrument for measuring grain temp. |
| JP2005151727A (en) * | 2003-11-18 | 2005-06-09 | Furukawa Electric Co Ltd:The | Method of measuring critical current of superconducting cable line |
| CN1725386A (en) * | 2004-07-20 | 2006-01-25 | Y.Y.L株式会社 | DC superconducting feeding cable and feeding system |
| CN1961385A (en) * | 2005-01-13 | 2007-05-09 | Ls电线有限公司 | Superconducting power cable capable of quench detection and quench detection system using the same |
Non-Patent Citations (1)
| Title |
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| 基于全球定位系统和锁相环技术的同步相量测量装置的实现;郎兵，骆平，汪祥;《中国电力》;20060705;第39卷(第7期);84-88页 * |
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