CN102914729A - On-line monitoring and positioning pulse transmitting device for local discharge of mine cable - Google Patents
On-line monitoring and positioning pulse transmitting device for local discharge of mine cable Download PDFInfo
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- CN102914729A CN102914729A CN2012103930959A CN201210393095A CN102914729A CN 102914729 A CN102914729 A CN 102914729A CN 2012103930959 A CN2012103930959 A CN 2012103930959A CN 201210393095 A CN201210393095 A CN 201210393095A CN 102914729 A CN102914729 A CN 102914729A
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Abstract
The invention discloses an on-line monitoring and positioning pulse transmitting device for local discharge of a mine cable. The on-line monitoring and positioning pulse transmitting device mainly comprises a pulse transmitting coil, a high-frequency signal cable and a pulse transmitting host, wherein the pulse transmitting coil is connected with the pulse transmitting host through the high-frequency signal cable; and the pulse transmitting host is used for controlling the pulse current amplitude and frequency generated by a pulse transmitting circuit. According to the on-line monitoring and positioning pulse transmitting device for the local discharge of the mine cable, disclosed by the invention, the problems of on-line monitoring and positioning for local discharge of a power distribution cable carried out in a mine are solved; the spreading speed of pulse along the cable and an attenuation coefficient are accurately calculated; and the accuracy, the reliability and the monitoring efficiency of on-line monitoring and positioning of the local discharge of the mine cable are improved. The on-line monitoring and positioning pulse transmitting device is not directly and electrically connected with the measured cable during work on site, can be fixedly mounted for long-time monitoring or portably moved for circulation detection, and has the characteristics of flexibility, portability, safety and the like.
Description
Technical field
The present invention relates to mine power equipment state of insulation on-line monitoring technique and application thereof, particularly relate to non-intrusion type partial discharge monitoring and location correlative technology field when carrying out Condition assessment of insulation for mine cable.
Background technology
In recent years, a kind of advanced person's online, charged, the inner partial discharge monitoring technology of non-intrusion type power cable kind equipment have obtained increasing application at electric power enterprise, by at these equipment ground line places in short-term or the fixed installation High Frequency Current Sensor, the pulse current of ground wire is flow through in measurement, analyze intensity and the frequency of shelf depreciation, can realize insulation state monitoring and the fault diagnosis of power cable.
Electric power enterprise practice in recent years shows, although above-mentioned monitoring method obtains preferably effect, but also exist some technical matterss not yet to solve, ground unrest interference problem when mainly containing on-line monitoring, attenuation problem when the high-frequency emission pulse is transmitted in cable, the accurate estimation problem of high-frequency emission pulse velocity of propagation in cable.On the other hand, the mine power equipment safety detection technology also more and more causes people's attention, and the research of detection technique is just at the early-stage.
At first, ground unrest interference problem: under the on-line monitoring environment, a lot of outside strong electromagnetic can be passed through grounded screen, grounding copper bar, the propagation of cable grounding alignment electrical network, bring very large interference to on-line monitoring system, cause the reflection unit false triggering.
Secondly, impulse attenuation problem: the attenuation coefficient that the transponder pulse of different frequency is propagated in cable is different, can affect the accurate evaluation to strength of discharge.
At last: the velocity of propagation problem.The velocity of propagation of signal in cable directly affects the accuracy and efficiency of shelf depreciation location.
Therefore, how to design a kind of safe, portable, efficient impulse ejection device, solve the problem of mine cable partial discharge monitoring and location, be one of important subject of current industry.
Summary of the invention
The invention provides a kind of mine cable partial discharge monitoring and position pulse emitter, have the characteristics such as safe, portable, flexible and accurate, solved that the amplitude of current distribution cable on-line monitoring and positioning system transmitting terminal institute emission of high frequency signals and frequency can not be adjusted and the problem that causes the partial discharge location failure, promote the technical merit of association area, remedied monitoring technology deficiency in actual applications.
A kind of mine cable partial discharge monitoring of the present invention and position pulse emitter, mainly by the impulse ejection coil, high frequency signal cable and impulse ejection main frame form, described impulse ejection coil links to each other with the impulse ejection main frame by high frequency signal cable, described impulse ejection main frame comprises impulse ejection circuit and arm processor, and described impulse ejection main circuit will be made of high speed electronic switch K21, inductance L 21, inductance L 22, inductance L 23, inductance L 24, capacitor C 21, capacitor C 22, capacitor C 23, capacitor C 24 and resistance R 21.The node of inductance L 21 right-hand members and electronic switch K21 left end is by capacitor C 21 ground connection; The node of inductance L 22 right-hand members and inductance L 21 left ends is by capacitor C 22 ground connection; The node of inductance L 22 left ends and inductance L 23 right-hand members is by capacitor C 23 ground connection; The node of inductance L 23 left ends and inductance L 24 right-hand members is by capacitor C 24 ground connection; Inductance L 24 left end nodes are by resistance R 21 ground connection.
Described impulse ejection coil mainly is comprised of pincerlike shell, magnetic core, coil, integrating resistor, passive bandpass filters, discharge tube, BNC connector, described coil winding is on magnetic core, described magnetic core is positioned at shell, an end of described coil is drawn and is connected with BNC connector by passive bandpass filters from shell, be connected to the BNC connector two ends after described integrating resistor and the discharge tube series connection, and the node between integrating resistor and the discharge tube links to each other with the input end of passive bandpass filters.
Described passive bandpass filters mainly is made of inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, capacitor C 41, capacitor C 42, capacitor C 43, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47; The left end of described inductance C41 is by capacitor C 41 ground connection; The left end of the right-hand member of described inductance L 41 and inductance L 42 is by capacitor C 42 ground connection; The left end of the right-hand member of described inductance L 42 and capacitor C 44 is by capacitor C 43 ground connection; The left end of the right-hand member of described capacitor C 44 and capacitor C 45 is by inductance L 43 ground connection, and the left end of the right-hand member of described capacitor C 45 and capacitor C 46 is by inductance L 44 ground connection, and the left end of the right-hand member of described capacitor C 46 and capacitor C 47 is by inductance L 45 ground connection.
Described high frequency signal cable 12 be 45MHz with interior decay less than the 0.5dB/m single core coaxial cable.
Described impulse ejection circuit seals in the enclosure, and the periphery of described shell and described shell pincer is provided with insulating material, and this insulating material all adopts the epoxy resin material.
After adopting this design, the present invention has following advantage at least:
1, the present invention adopts the non-intrusion type design, and transmitting coil shell and host housing all have dielectric level and the flame proof requirement of mine field requirement, have guaranteed the security the when user of service operates this instrument;
2, apparatus of the present invention volume is little, and is lightweight.Be easy to carry when being used for Daily Round Check, be easy to when being used for long-term on-line monitoring install;
When 3, using the present invention to carry out field monitoring, operating personnel only need pincerlike pulse producer is installed on the cable grounding line, can launch the pulse current of varying strength and frequency by the impulse ejection main frame, by calculating the mistiming of transponder pulse and reflected impulse, can accurately calculate the velocity of propagation of pulse in cable; By calculating the difference in magnitude of transponder pulse and reflected impulse, whether the attenuation coefficient in the time of can accurately calculating the pulse edge cable transmission shelf depreciation occurs in the cable and locates shelf depreciation thereby can diagnose out.Personnel monitoring's efficient, the precision of shelf depreciation location and the reliability of state estimation have greatly been improved.
Description of drawings
The above only is that the present invention program summarizes, and in order more to clearly demonstrate technological means of the present invention, below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
Fig. 1 is the composition schematic diagram of a kind of mine cable partial discharge monitoring of the present invention and position pulse emitter.
Fig. 2 is the basic composition schematic diagram of a kind of mine cable partial discharge monitoring of the present invention and position pulse emitter impulse ejection coil.
Fig. 3 is the basic structure schematic diagram of a kind of mine cable partial discharge monitoring of the present invention and the passive bandwidth-limited circuit of position pulse emitter.
Fig. 4 is the basic composition schematic diagram of a kind of mine cable partial discharge monitoring and position pulse emitter impulse ejection circuit.
Fig. 5 is the basic composition schematic diagram of a kind of mine cable partial discharge monitoring and position pulse emitter impulse ejection main frame.
Fig. 6 is the attenuation coefficient of a kind of mine cable partial discharge monitoring of the present invention and position pulse emitter pulse signal transmission at the scene time the and the schematic diagram of mistiming.
Embodiment
As shown in Figure 1, a kind of mine cable partial discharge monitoring and position pulse emitter mainly are comprised of pincerlike impulse ejection coil 11, high frequency signal cable 12, impulse ejection main frame 13.
As shown in Figure 2, pincerlike impulse ejection coil 11 is comprised of pincerlike shell 21, magnetic core 22, coil 23, integrating resistor 24, passive bandpass filters 25, discharge tube 26, BNC connector 27.Described coil 23 is wrapped in magnetic core 22 peripheries, described magnetic core 22 is arranged in the pincerlike shell 21, an end of described coil is drawn and is passed through passive bandpass filters 25 from shell and is connected with BNC connector 27, be connected to the BNC connector two ends after described integrating resistor 24 and discharge tube 26 series connection, and the node between integrating resistor 24 and the discharge tube 26 links to each other with the input end of passive bandpass filters 25.
Figure 3 shows that passive bandpass filters 25, mainly consisted of by inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, capacitor C 41, capacitor C 42, capacitor C 43, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47.Described inductance C41, inductance L 42, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47 are connected in series successively; One end ground connection of described capacitor C 41, the other end links to each other with the input end of inductance L 41; One end ground connection of described capacitor C 42, the other end links to each other with node between inductance L 41 and the inductance L 42; One end ground connection of described capacitor C 43, the other end links to each other with node between inductance L 42 and the capacitor C 44; One end ground connection of described inductance L 43, the other end links to each other with node between capacitor C 44 and the capacitor C 45; One end ground connection of described inductance L 44, the other end links to each other with node between capacitor C 45 and the capacitor C 46; One end ground connection of inductance L 45, the other end links to each other with node between capacitor C 46 and the capacitor C 47.
As shown in Figure 5, impulse ejection main frame 13 is comprised of shell 51, BNC connector 52, impulse ejection circuit 53, arm processor 54, display screen 55.
Single core coaxial cable connects the BNC connector of transmitting coil and the BNC connector of impulse ejection main frame, so that the pulse signal of impulse ejection main frame emission can be delivered to transmitting coil.
Described arm processor links to each other with the impulse ejection circuit, during use, by pincerlike impulse ejection coil 11 apparatus of the present invention are installed on the cable grounding line, then, by impulse ejection main frame transponder pulse signal, pass at last reflected impulse back, calculate the mistiming of transponder pulse and reflected impulse by the ARM processor, the final velocity of propagation of accurate Calculation pulse in cable; In addition, by calculating the difference in magnitude of transponder pulse and reflected impulse, whether the attenuation coefficient in the time of can accurately calculating the pulse edge cable transmission shelf depreciation occurs in the cable and locates shelf depreciation thereby can diagnose out.
Shell 21, shell 51 all adopt epoxy resin insulation material.
The analysis software that comprises in the impulse ejection main frame, groundwork are to extract transponder pulse and the mistiming of reflected impulse and the difference in magnitude of transponder pulse and reflected impulse, as shown in Figure 6.Transmit and gathered and analyze simultaneously with reflected signal.Can calculate the speed that the pulse edge cable is propagated according to mistiming of measuring-signal, thereby lay the first stone for the location of local discharge signal.By the amplitude difference of transponder pulse and reflected impulse, can infer the attenuation coefficient when high-frequency current signal propagates along cable.As shown in Figure 6, suppose that emission and reflected current signal that main frame 13 records are respectively " signal 61 " and " signal 62 ", signal amplitude is respectively U
1And U
2, the mistiming is Δ t=t
2-t
1If propagation velocity of electromagnetic wave is v, the distance L between the two sensors=Δ t X v so, and then can extrapolate attenuation coefficient α=ln(U
1/ U
2)/L.
As seen, the present invention has creatively solved at mine on-the-spot, high-frequency pulse current signal by impulse ejection device transmission frequency and variable-magnitude, so that reflection end can receive the pulse current larger than actual noise, avoided the reflection electric circuit false triggering, the speed that the pulse edge cable is propagated when obtaining on-line monitoring of cable and attenuation coefficient problem, improved monitoring effect and work efficiency.
The above; it only is preferred embodiment of the present invention; be not that the present invention is done any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (5)
1. a mine cable partial discharge monitoring and position pulse emitter, it is characterized in that: mainly by impulse ejection coil (11), high frequency signal cable (12) and impulse ejection main frame (13) form, described impulse ejection coil (11) links to each other with the impulse ejection main frame by high frequency signal cable (12), described impulse ejection main frame comprises impulse ejection circuit (53) and arm processor (54), and described impulse ejection circuit (53) is mainly by high speed electronic switch K21, inductance L 21, inductance L 22, inductance L 23, inductance L 24, capacitor C 21, capacitor C 22, capacitor C 23, capacitor C 24 and resistance R 21 consist of; The node of inductance L 21 right-hand members and electronic switch K21 left end is by capacitor C 21 ground connection; The node of inductance L 22 right-hand members and inductance L 21 left ends is by capacitor C 22 ground connection; The node of inductance L 22 left ends and inductance L 23 right-hand members is by capacitor C 23 ground connection; The node of inductance L 23 left ends and inductance L 24 right-hand members is by capacitor C 24 ground connection; Inductance L 24 left end nodes are by resistance R 21 ground connection.
2. a kind of mine cable partial discharge monitoring according to claim 1 and position pulse emitter, it is characterized in that: described impulse ejection coil (11) is mainly by pincerlike shell (21), magnetic core (22), coil (23), integrating resistor (24), passive bandpass filters (25), discharge tube (26), BNC connector (27) forms, described coil winding is on magnetic core, described magnetic core is positioned at shell, an end of described coil is drawn and is passed through passive bandpass filters (25) from shell and is connected with BNC connector (27), be connected to the BNC connector two ends after described integrating resistor (24) and discharge tube (26) series connection, and the node between integrating resistor (24) and the discharge tube (26) links to each other with the input end of passive bandpass filters (25).
3. a kind of mine cable partial discharge monitoring according to claim 2 and position pulse emitter, it is characterized in that: described passive bandpass filters (25) mainly is made of inductance L 41, inductance L 42, inductance L 43, inductance L 44, inductance L 45, capacitor C 41, capacitor C 42, capacitor C 43, capacitor C 44, capacitor C 45, capacitor C 46, capacitor C 47; The left end of described inductance C41 is by capacitor C 41 ground connection; The left end of the right-hand member of described inductance L 41 and inductance L 42 is by capacitor C 42 ground connection; The left end of the right-hand member of described inductance L 42 and capacitor C 44 is by capacitor C 43 ground connection; The left end of the right-hand member of described capacitor C 44 and capacitor C 45 is by inductance L 43 ground connection, and the left end of the right-hand member of described capacitor C 45 and capacitor C 46 is by inductance L 44 ground connection, and the left end of the right-hand member of described capacitor C 46 and capacitor C 47 is by inductance L 45 ground connection.
4. the described a kind of mine cable partial discharge monitoring of any one and position pulse emitter according to claim 1-3, it is characterized in that: described impulse ejection circuit is enclosed in the shell (51), pincerlike (21) periphery of described shell (51) and described shell is provided with insulating material, and this insulating material all adopts the epoxy resin material.
5. the described a kind of mine cable partial discharge monitoring of any one and position pulse emitter according to claim 1-3 is characterized in that: described high frequency signal cable be 45MHz with interior decay less than the 0.5dB/m single core coaxial cable.
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| CN201210393095.9A CN102914729B (en) | 2012-10-16 | 2012-10-16 | A kind of mine cable partial discharge monitoring and position pulse emitter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106646156A (en) * | 2016-11-30 | 2017-05-10 | 国网河南省电力公司滑县供电公司 | Power cable partial discharge online monitoring system |
| CN106716153A (en) * | 2014-09-17 | 2017-05-24 | 三菱电机株式会社 | Partial discharge signal processing device |
| CN106771857A (en) * | 2016-12-05 | 2017-05-31 | 广西电网有限责任公司柳州供电局 | Cross-inked polyethylene power cable insulation defect characteristic gas detecting system |
| CN107831404A (en) * | 2017-09-22 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | Method and system based on the legal position XLPE cable partial discharge position of high-frequency pulse current |
| CN108120901A (en) * | 2017-12-27 | 2018-06-05 | 温岭市创嘉信息科技有限公司 | A kind of cable fault localization method and device |
| CN111175611A (en) * | 2020-02-06 | 2020-05-19 | 云南电网有限责任公司电力科学研究院 | Power distribution network line fault positioning method and system |
| CN111245280A (en) * | 2020-03-10 | 2020-06-05 | 中国工程物理研究院流体物理研究所 | High-voltage pulse generator |
| CN112180218A (en) * | 2020-09-30 | 2021-01-05 | 北京神州泰岳软件股份有限公司 | Partial discharge monitoring method, system and device |
| CN112881949A (en) * | 2021-01-18 | 2021-06-01 | 浙江华电器材检测研究所有限公司 | UHF partial discharge-based insulated puncture wire clamp contact state detection device and method |
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Cited By (12)
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| CN106716153A (en) * | 2014-09-17 | 2017-05-24 | 三菱电机株式会社 | Partial discharge signal processing device |
| CN106716153B (en) * | 2014-09-17 | 2019-07-09 | 三菱电机株式会社 | Signal processing of partial discharge device |
| CN106646156A (en) * | 2016-11-30 | 2017-05-10 | 国网河南省电力公司滑县供电公司 | Power cable partial discharge online monitoring system |
| CN106771857A (en) * | 2016-12-05 | 2017-05-31 | 广西电网有限责任公司柳州供电局 | Cross-inked polyethylene power cable insulation defect characteristic gas detecting system |
| CN107831404A (en) * | 2017-09-22 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | Method and system based on the legal position XLPE cable partial discharge position of high-frequency pulse current |
| CN107831404B (en) * | 2017-09-22 | 2020-02-14 | 国网山东省电力公司电力科学研究院 | Method and system for positioning XLPE cable partial discharge position based on high-frequency pulse current method |
| CN108120901A (en) * | 2017-12-27 | 2018-06-05 | 温岭市创嘉信息科技有限公司 | A kind of cable fault localization method and device |
| CN111175611A (en) * | 2020-02-06 | 2020-05-19 | 云南电网有限责任公司电力科学研究院 | Power distribution network line fault positioning method and system |
| CN111175611B (en) * | 2020-02-06 | 2022-04-12 | 云南电网有限责任公司电力科学研究院 | Power distribution network line fault positioning method and system |
| CN111245280A (en) * | 2020-03-10 | 2020-06-05 | 中国工程物理研究院流体物理研究所 | High-voltage pulse generator |
| CN112180218A (en) * | 2020-09-30 | 2021-01-05 | 北京神州泰岳软件股份有限公司 | Partial discharge monitoring method, system and device |
| CN112881949A (en) * | 2021-01-18 | 2021-06-01 | 浙江华电器材检测研究所有限公司 | UHF partial discharge-based insulated puncture wire clamp contact state detection device and method |
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Application publication date: 20130206 Assignee: Shandong Ronglida Mining Electrical Appliance Equipment Co.,Ltd. Assignor: Xi'an Jiaotong University Contract record no.: 2013370000101 Denomination of invention: On-line monitoring and positioning pulse transmitting device for local discharge of mine cable License type: Exclusive License Record date: 20130503 |
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