CN101782622A - Partial discharge on-line monitoring device of power cable and joint - Google Patents
Partial discharge on-line monitoring device of power cable and joint Download PDFInfo
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- CN101782622A CN101782622A CN200910219131A CN200910219131A CN101782622A CN 101782622 A CN101782622 A CN 101782622A CN 200910219131 A CN200910219131 A CN 200910219131A CN 200910219131 A CN200910219131 A CN 200910219131A CN 101782622 A CN101782622 A CN 101782622A
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Abstract
The invention relates to a partial discharge on-line monitoring device of a power cable and a joint, comprising high-frequency sensors 1 and 3 arranged at both ends of the body of a monitored power cable body and also comprising a high-frequency sensor 5 arranged on the power cable body. The high-frequency sensors 1, 3 and 5 are respectively connected with the signal input end of an amplification wave filter 7; the signal output end of the amplification wave filter 7 is connected with the signal input end of a high-speed acquisition card of a network-based RJ45 interface; the signal output end of the high-speed acquisition card of the network-based RJ45 interface is connected with the signal input end of an optical fibre transmission module 11; and the signal output end of the optical fibre transmission module is connected with the signal input end of a monitoring host; polarity judgement is carried out on coupled signals respectively with two high-frequency body sensor signals, and moreover, a ground can also independently analyze pulse signals by analysis software, and interference types are distinguished according to the frequencies of the coupled signals and the characteristics of pulses, thereby improving the system applicability and accuracy.
Description
Technical field
The invention belongs to the insulation of electrical installation monitoring technical field, particularly power cable and joint local discharge on-line monitoring device.
Background technology
Power cable has become one of blood vessel that transmits electric power, be of paramount importance equipment in the transmission of electricity, and it is impure and have air gap and harmfulness impurity for the difficulty on the cable process technology or starting material, perhaps because technological reason, between insulation and semiconductive shielding layer, exist gap or semiconductor outstanding to insulation course, very easily produce shelf depreciation (PD) at these air gaps and the most advanced and sophisticated place of impurity, simultaneously in the installation and operation process of power cable, also may produce various insulation defects and cause shelf depreciation, therefore the shelf depreciation of cable and joint is the omen of cable built-in electrical insulation deterioration, so in time find the shelf depreciation situation of power cable and joint, can in time find the inner incipient fault of power cable and joint, avoid taking place paroxysmal insulation fault, help the operation of electric power delivery safety.
Shelf depreciation is the particularly main project of plastic cable non-destructive electrical inspection of cable insulation always.Since the later stage fifties, the exploitation that the countries in the world professional person is devoted to highly sensitive Partial discharge detector device one after another comes cable insulation is carried out the detection of shelf depreciation, in the development afterwards, mainly be that two aspects of anti-interference problem and shelf depreciation location that center in the partial discharge monitoring are launched.Main monitoring method has capacitive couplings and inductive coupling method, inductive coupling comprises built-in and external, the built-in method of inductive coupling, maximum shortcoming is an inner structure of having destroyed cable splice, make cable insulation be subjected in various degree damage, be unfavorable for test, existing inductive coupling external method of testing is by a pair of performance, structure is identical and have a high frequency body sensors of polarity identification function, adding software analysis forms, its principle of work discharge signal is by the pulse signal of difference different directions, the polarity of its output signal can change along with the change of the pulse current direction of passing, and differentiates external disturbance or internal discharge through software analysis again.The shortcoming of this method of testing is that earthing mode is very big to the influential effect of this method signal coupling and polarity discriminating, and the interference that comes from ground wire is easy to cause system to judge into discharge by accident.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of power cable and joint local discharge on-line monitoring device, using pulse that two high frequency body sensors and high frequency earthing sensor come in different directions carries out polarity one by one and differentiates, be coupled to from the discharge scenario between cable body section and the core, reach the purpose of one section cable of monitoring, shortened analog signal transmission length, increased digital data transmission length, distinguish to differentiate it is the cable splice internal discharge with this, or external interference signals, handle the partial discharge quantity size that spectrum analysis is analyzed cable by computer digit again, have the accuracy of measurement height, the characteristics of the antijamming capability of raising system.
To achieve these goals, the technical solution used in the present invention is: a kind of power cable and joint local discharge on-line monitoring device, include the high frequency sensors 1 and the high frequency sensors 3 that are arranged on tested power cable body 4 joint two ends, also comprise the high frequency sensors 5 that is arranged on the power cable body 4, high frequency sensors 1, high frequency sensors 3 all links to each other with the signal input part of amplifilter 7 with high frequency sensors 5, the signal output part of amplifilter 7 links to each other with the signal input part of (RJ45) Network Based interface high-speed collection card 9, the signal output part of (RJ45) Network Based interface high-speed collection card 9 links to each other with the signal input part of Optical Fiber Transmission module 11, and the signal output part of Optical Fiber Transmission module 11 links to each other with monitoring main frame 13 signal input parts.
Described high frequency sensors 1, high frequency sensors 3 is identical with the structure of high frequency sensors 5, it includes metal circular shell 22, one end of metal circular shell 22 is the pins 27 that can check card, the other end is by the hinge 28 of opening angle arbitrarily, magnetic core 21 is by being fixed on behind the epoxy casting in the metal circular shell 22, magnetic core 21 is provided with coiling 26,26 two ends that wind the line are connected with sample resistance 29, signal output interface 24 is arranged on the metal circular shell 22, be connected with the two ends of coiling 26, circular arc type support 19 is separately fixed on two semicircles up and down of metal circular shell 22, it is semicircular rectangular slot 30 that circular arc type support 19 is provided with two, specifically regulates two and can regulate the diameter that circular arc type support 19 is surrounded.
Described magnetic core 21 is ferrite materials.
The number of turn of described coiling 26 is 8 to 15 circles.
The diameter of described circular arc type support 19 can be regulated, and its radian is ∏/2.
The diameter maximum of described circular arc type support 19 equals metal circular shell 22 diameters, and it is half of diameter of metal circular shell 22 that minimum can be adjusted to.
The present invention is owing to dispose high frequency sensors 1 high frequency sensors 3 respectively at power cable body 4 joint two ends, on power cable body 4, dispose high frequency sensors 5, so can be by to the contrast of the heteropolarity of discharge signal with the same polarity of the undesired signal that is coupled to, judge cable splice internal discharge or undesired signal with this, have accuracy of measurement height, characteristics that antijamming capability is high.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the present invention's heteropolarity signal demonstration graph in test.
Fig. 3 is tested out same polarity signal demonstration graph by the present invention.
Fig. 4 tests out heteropolarity signal demonstration graph for the present invention.
Fig. 5 is the structural representation of high frequency sensors 1, high frequency sensors 3 or high frequency sensors 5 among the present invention, and wherein: Fig. 5 (a) is a side view; Fig. 5 (b) is a vertical view.
Fig. 6 is the spectrogram of the cable splice shelf depreciation of the actual test in laboratory of the present invention, wherein: Fig. 6 (a) is i.e. (N-q-φ) figure of three-dimensional discharge spectrogram, Fig. 6 (b) is two dimension discharge spectrogram (q-φ) figure, Fig. 6 (c) is two dimension discharge spectrogram (N-φ) figure, and Fig. 6 (d) is two dimension discharge spectrogram (N-φ) figure.
Specific implementation method
Below in conjunction with accompanying drawing structural principle of the present invention and principle of work are described in further detail.
Referring to Fig. 1, a kind of power cable and joint local discharge on-line monitoring device, include the high frequency body sensors 1 and the high frequency body sensors 3 that are arranged on tested 220kV power cable body 4 joints 2 two ends, also be provided with high frequency earthing sensor 5 on the power cable body 4, high frequency body sensors 1, high frequency body sensors 3 all links to each other with the signal input part of amplifilter 7 with high frequency earthing sensor 5, the signal output part of amplifilter 7 links to each other by high frequency coaxial line 8 with the signal input part of (RJ45) Network Based interface high-speed collection card 9, the signal output part of (RJ45) Network Based interface high-speed collection card 9 links to each other by netting twine 10 with the signal input part of Optical Fiber Transmission module 11, and the signal output part of Optical Fiber Transmission module 11 links to each other by netting twine 12 with monitoring main frame 13 signal input parts.
The present invention distributes according to cable splice relatively to disperse (being generally several kilometers joints), from characteristics such as master-control room is far away, select distributed frame, each collecting unit distributes and is installed near the tested cable splice equipment, by ICP/IP protocol, with the mode and the data server communication of digital communication.All Monitoring Data are stored in the master station computer database, database format meets the requirement of State Grid Corporation of China's state maintenance support platform to the on-line monitoring system database format, this collecting part is placed on the next door of cable splice, avoided the long Distance Transmission of simulating signal like this, it is bigger to decay, disturb greatlyyer, cause the test macro error to become big shortcoming.
The present invention is a kind of power cable and joint local discharge on-line monitoring device, comprises Optical Fiber Transmission module 11.Can convert the digital signal that collects to light signal, long Distance Transmission is disturbed lessly, and transmission range can reach 500 kilometers farthest.
Software section of the present invention is to adopt virtual instrument technique, hardware module is combined with computing machine, utilize LabVIEW to write software, pass through interface operation, realize various functions, and be convenient to further developing, and add other comprehensive interference protection measures such as threshold voltage, digital filtering, wavelet analysis are set, make measurement result accurately and reliably.
Referring to Fig. 2, principle of work of the present invention is: when tested cable splice generation shelf depreciation, discharge signal 14, discharge signal 18 can transmit toward both sides along cable, at this moment the high frequency body sensors 1 on both sides, high frequency body sensors 3 can be coupled to discharge signal, and be the heteropolarity signal, discharge and record are then tentatively thought by system.Discharge signal 14, discharge signal 18 also can be along passing through the effect of cable distribution electric capacity, transmit along ground wire by screen layer, also can be coupled to by high frequency earthing sensor 5, and with discharge signal that high frequency body sensors 1, high frequency body sensors 3 are coupled to more also be heteropolarity, system validation is the cable internal discharge at this moment, writes database.When undesired signal 15, undesired signal 16, undesired signal 17 are transferred to high frequency body sensors 1, high frequency body sensors 3 is the same polarity signal, undesired signal is tentatively thought by system, when undesired signal 15, undesired signal 16, undesired signal 17 by distributed capacitance do the time spent during through ground wire high frequency earthing sensor 5 be coupled to, through being coupled to signal contrast with high frequency body sensors 1, high frequency body sensors 3, it also is same polarity, be illustrated as undesired signal, judge whether to be the cable splice internal discharge with this.
Referring to Fig. 3, the lab investigation data, two lines represent two paths of signals in a period of time (horizontal ordinate), pulse amplitude (ordinate) situation of change figure, dotted line and solid line are represented two paths of signals respectively among the figure, and two paths of signals is evident as the same polarity signal, and system then thinks to disturb.
Referring to Fig. 4, the lab investigation data, two lines represent two paths of signals in a period of time (horizontal ordinate), and pulse amplitude (ordinate) situation of change is attempted earlier, and two paths of signals is evident as the heteropolarity signal among the figure, and discharge is then thought by system.
Fig. 5 is high frequency body sensors 1, high frequency body sensors 3 or high frequency earthing sensor 5 structural representations.The interior diameter of metal circular shell 22 is 190mm.One end of metal circular shell 22 is the pins 27 that can check card, the other end is by the hinge 28 of opening angle arbitrarily, magnetic core 21 is by being fixed on behind the epoxy casting in the metal circular shell 22, magnetic core 21 is ferrite materials, magnetic core 21 is provided with coiling 26, its number of turn is 8 to 15 circles, 26 two ends that wind the line are connected with sample resistance 29, its resistance is that 500 Ω are to 1K Ω, signal output interface 24 is arranged on the metal circular shell 22, be connected with the two ends of coiling 26, circular arc type support 19 is separately fixed on two semicircles up and down of metal circular shell 22 by screw 23, two circular arc type support 19 radians that can regulate diameter are ∏/2, it is semicircular rectangular slot 30 that circular arc type support 19 is provided with two, two of concrete adjustings can be regulated the diameter method that the circular arc type support is surrounded, be to be fixed on metal circular shell 22 screwings 23 by four, each screw 23 can be returned back movable on sensor stand 19 in the rectangular slot 30, realize transfer circular arc type support 19, the size of the round diameter that is blocked with this.This round diameter maximum equals metal circular shell 22 diameters, and it is half of diameter of metal circular shell 22 that minimum can be adjusted to, and so just can use on the cable of 10KV in all electric pressures of 220KV.
Fig. 6 is lab investigation data of the present invention, discharge signal analysis of spectra, and it comprises four little figure, and Fig. 6 (a) is a discharge capacity for the three-dimensional spectrum X-axis, and Y-axis is a discharge phase, and the Z axle is discharge time (N-q-φ), is the comprehensive embodiment of other three figure.Fig. 6 (b) is a transverse axis for putting phase place, and the longitudinal axis is that discharge capacity (q-φ) is illustrated in discharge capacity size in the power frequency period.Fig. 6 (c) is a transverse axis for putting phase place, and the longitudinal axis is discharge capacity (N-φ) expression, the position of discharge capacity number of times correspondence in a power frequency period.Fig. 6 (d) is that transverse axis is a discharge capacity, and the longitudinal axis is the discharge time of the different discharge capacity correspondences of discharge time (N-φ) expression.Have laboratory test results can clearly mark and draw this and measure discharge scenario, the discharge amplitude is 1.56pC to the maximum, and discharge time is 32 times, and average discharge capacity is 1.09pC.And can know and find out that the phase position that produces discharge in a power frequency period differs 180 °, meets the feature of shelf depreciation.
This shows through minimum discharge capacity: 1pC, survey frequency: 300kHz-50MHz, the discharge pulse resolution measured of lab investigation: 10 μ s, phase resolution: 0.18 °, can know power frequency period discharge figure, two dimension (q-φ that the tested cable splice of demonstration office puts, N-φ, N-q) and three-dimensional (N-q-φ) discharge spectrogram.
Among the figure: 1 is the high frequency body sensors; 2 is power cable connector; 3 is the high frequency body sensors; 4 is the power cable body, and 5 is the high frequency earthing sensor; 6 is coaxial cable; 7 amplifilters; 8 is coaxial cable; 9 is (RJ45) Network Based interface high-speed collection card; 10 is netting twine; 12 is netting twine; 11 is the Optical Fiber Transmission module; 13 are the monitoring main frame; 14 is discharge signal; 18 is discharge signal; 15 is undesired signal; 16 is undesired signal; 17 is undesired signal; 19 is the circular arc type support; 20 is screw; 23 is screw; 21 is magnetic core; 25 is magnetic core; 22 is the metal circular shell; 24 is signal output interface; 26 are coiling; 27 is pin; 28 is hinge; 29 is sample resistance; 30 both sides are semicircular rectangular slot.
The present invention adopts the bipolarity discrimination method, promptly increase the grounding sensor of a same performance at ground wire, carry out polarity discriminating with two high frequency body sensors signals respectively with the signal that this sensor was coupled to, distinguish whether ground wire disturbs, thereby eliminated, cable is affected because ground connection is different.In addition, can also pass through analysis software at grounding sensor, the separate analysis pulse signal is further distinguished according to being coupled to signal frequency and pulse characteristics, is the interference of concrete what type, thereby has improved system suitability and accuracy.
Claims (6)
1. power cable and joint local discharge on-line monitoring device, include the high frequency sensors (1) and the high frequency sensors (3) that are arranged on tested power cable body (4) joint two ends, it is characterized in that, also comprise the high frequency sensors (5) that is arranged on the power cable body (4), high frequency sensors (1), high frequency sensors (3) all links to each other with the signal input part of amplifilter (7) with high frequency sensors (5), the signal output part of amplifilter (7) links to each other with the signal input part of RJ45 interface high-speed collection card Network Based (9), the signal output part of RJ45 interface high-speed collection card Network Based (9) links to each other with the signal input part of Optical Fiber Transmission module (11), and the signal output part of Optical Fiber Transmission module (11) links to each other with monitoring main frame (13) signal input part.
2. a kind of power cable according to claim 1 and joint local discharge on-line monitoring device, it is characterized in that, described high frequency sensors (1), high frequency sensors (3) is identical with the structure of high frequency sensors (5), it includes metal circular shell (22), one end of metal circular shell (22) is the pin (27) that can check card, the other end is by the hinge of opening angle (28) arbitrarily, magnetic core (21) is by being fixed on behind the epoxy casting in the metal circular shell (22), magnetic core (21) is provided with coiling (26), coiling (26) two ends are connected with sample resistance (29), signal output interface (24) is arranged on the metal circular shell (22), be connected with the two ends of coiling (26), circular arc type support (19) is separately fixed on two semicircles up and down of metal circular shell (22), it is semicircular rectangular slot (30) that circular arc type support (19) is provided with two, specifically regulates two and can regulate the diameter that circular arc type support (19) is surrounded.
3. a kind of power cable according to claim 2 and joint local discharge on-line monitoring device is characterized in that, described magnetic core (21) is the ferrite material.
4. a kind of power cable according to claim 2 and joint local discharge on-line monitoring device is characterized in that, the number of turn of described coiling (26) is 8 to 15 circles.
5. a kind of power cable according to claim 2 and joint local discharge on-line monitoring device is characterized in that, the diameter of described circular arc type support (19) can be regulated, and its radian is ∏/2.
6. a kind of power cable according to claim 2 and joint local discharge on-line monitoring device, it is characterized in that, the diameter maximum of described circular arc type support (19) equals metal circular shell (22) diameter, and it is half of diameter of metal circular shell (22) that minimum can be adjusted to.
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| CN200910219131A CN101782622A (en) | 2009-11-25 | 2009-11-25 | Partial discharge on-line monitoring device of power cable and joint |
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| CN200910219131A CN101782622A (en) | 2009-11-25 | 2009-11-25 | Partial discharge on-line monitoring device of power cable and joint |
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| CN200910219131A Pending CN101782622A (en) | 2009-11-25 | 2009-11-25 | Partial discharge on-line monitoring device of power cable and joint |
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| CN102478618A (en) * | 2010-11-22 | 2012-05-30 | 上海市电力公司 | Online monitoring method for partial discharging of 500 KV cross-linked cable |
| CN102565637A (en) * | 2011-12-12 | 2012-07-11 | 广东电网公司电力科学研究院 | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement |
| CN103140766A (en) * | 2010-07-26 | 2013-06-05 | 普睿司曼股份公司 | Apparatus and method for monitoring an electric power transmission system through partial discharges analysis |
| CN103197218A (en) * | 2013-04-23 | 2013-07-10 | 国家电网公司 | High-voltage cable insulation defect partial discharge electrification detection diagnostic method |
| CN103399265A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | High voltage cable terminal partial discharge ultrasonic monitor |
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| CN106124939A (en) * | 2016-06-12 | 2016-11-16 | 西安博源电气有限公司 | Distributed high tension cable partial discharge monitoring and alignment system |
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| CN108508331A (en) * | 2018-02-08 | 2018-09-07 | 全球能源互联网欧洲研究院 | Cable accessory partial discharge monitoring device, method, terminal and readable storage medium storing program for executing |
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| CN111796172A (en) * | 2020-07-30 | 2020-10-20 | 中国电建集团华东勘测设计研究院有限公司 | Power cable intermediate head partial discharge positioning system |
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| CN103140766A (en) * | 2010-07-26 | 2013-06-05 | 普睿司曼股份公司 | Apparatus and method for monitoring an electric power transmission system through partial discharges analysis |
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| CN102478618A (en) * | 2010-11-22 | 2012-05-30 | 上海市电力公司 | Online monitoring method for partial discharging of 500 KV cross-linked cable |
| CN102565637A (en) * | 2011-12-12 | 2012-07-11 | 广东电网公司电力科学研究院 | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement |
| CN102565637B (en) * | 2011-12-12 | 2014-09-03 | 广东电网公司电力科学研究院 | Oscillation wave partial discharge detection system for cable based on asynchronous double-end measurement |
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| CN103197218B (en) * | 2013-04-23 | 2016-03-16 | 国家电网公司 | A kind of high-voltage cable insulation defect partial discharge electrification detection diagnostic method |
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| CN103399264A (en) * | 2013-07-30 | 2013-11-20 | 苏州光格设备有限公司 | Online monitoring and positioning system for local discharge of high-voltage cable |
| CN103399265B (en) * | 2013-08-13 | 2015-08-19 | 国家电网公司 | A kind of high voltage cable terminal partial discharge ultrasonic monitor |
| CN103399265A (en) * | 2013-08-13 | 2013-11-20 | 国家电网公司 | High voltage cable terminal partial discharge ultrasonic monitor |
| CN106124939A (en) * | 2016-06-12 | 2016-11-16 | 西安博源电气有限公司 | Distributed high tension cable partial discharge monitoring and alignment system |
| CN108344928A (en) * | 2017-01-24 | 2018-07-31 | 中国石油化工股份有限公司 | A kind of power cable local discharge on-line monitoring device and method |
| CN108344926A (en) * | 2017-01-24 | 2018-07-31 | 中国石油化工股份有限公司 | A kind of power cable local discharge on-line monitoring device and method |
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| CN108344927A (en) * | 2017-01-24 | 2018-07-31 | 中国石油化工股份有限公司 | A kind of power cable partial discharge monitoring device and method |
| CN108344928B (en) * | 2017-01-24 | 2021-04-06 | 中国石油化工股份有限公司 | Power cable partial discharge online monitoring device and method |
| CN108344926B (en) * | 2017-01-24 | 2021-04-06 | 中国石油化工股份有限公司 | Power cable partial discharge online monitoring device and method |
| CN108344927B (en) * | 2017-01-24 | 2021-04-06 | 中国石油化工股份有限公司 | Power cable partial discharge monitoring device and method |
| CN110462164A (en) * | 2017-06-26 | 2019-11-15 | 哈里伯顿能源服务公司 | System and method for multifrequency underground bus communication |
| CN108508331A (en) * | 2018-02-08 | 2018-09-07 | 全球能源互联网欧洲研究院 | Cable accessory partial discharge monitoring device, method, terminal and readable storage medium storing program for executing |
| CN108318793A (en) * | 2018-04-18 | 2018-07-24 | 国网安徽省电力有限公司六安供电公司 | A kind of defect section measuring device with electricity and its detection method for aerial insulated wire |
| CN109946573A (en) * | 2019-03-08 | 2019-06-28 | 国网山东省电力公司日照供电公司 | Shelf depreciation direction-finding method and system based on cluster and wireless sensing array |
| WO2021013249A1 (en) * | 2019-07-24 | 2021-01-28 | 全球能源互联网研究院有限公司 | Partial discharge detection sensor and manufacturing method therefor |
| TWI737309B (en) * | 2020-05-25 | 2021-08-21 | 國立臺灣科技大學 | On-line measuring system for partial discharges signals of cable joints |
| CN111796172A (en) * | 2020-07-30 | 2020-10-20 | 中国电建集团华东勘测设计研究院有限公司 | Power cable intermediate head partial discharge positioning system |
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Application publication date: 20100721 |