CN101710166A - Method for monitoring partial discharge of power cable connector on line - Google Patents
Method for monitoring partial discharge of power cable connector on line Download PDFInfo
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Abstract
The invention relates to a method for monitoring the partial discharge of a power cable connector on line. Firstly, power cables are classified into A phase, B phase and C phase, an A phase high frequency sensor 5 and an A phase high frequency sensor 13 are sleeved on a cable body 1, and B phase high frequency sensors and C phase high frequency sensors are connected respectively as the connecting mode of the A phase high frequency sensors; secondly, the output points of all the high frequency sensors are connected with a selective amplifying unit through a coaxial line, and a synchronous phase generator is connected with a testing mainframe through an acquisition unit; thirdly, the testing mainframe is switched on, firstly, a single-cycle testing program is selected; and then a 50-power frequency cycle testing program is accessed from a main program, and after the testing for 50 power frequencies is performed and polarity discrimination is pairwise performed on three signals, a final discharge spectrum is generated; and fourthly, the high frequency sensor 5 and the high frequency sensor 14 are used for performing pulse polarity discrimination on the retained discharge capacity of the testing result in the third step, and the remained discharge capacity is retained after interference is eliminated. The method has the advantage that the interference free performance is enhanced.
Description
Technical field
The invention belongs to the insulation of electrical installation monitoring technical field, particularly partial discharge of power cable connector on-the-spot test method.
Background technology
Up to now, the method that is used for twisted polyethylene cable and annex partial discharge monitoring thereof both at home and abroad has a lot.But because twisted polyethylene cable and annex local discharge signal thereof are faint, waveform is complicated and changeable, very easily flooded, so the key of research and development cable and annex partial discharge monitoring technology thereof is signal extraction technology and Anti-Jamming Technique by ground unrest and outside electromagnetic interference noise.The shelf depreciation method is the main project of crosslinking polyethylene-insulated cable insulation non-destructive electrical inspection always.Can be divided into according to signal extraction mode difference: inductive coupling method and capacitive couplings.Capacitive couplings can be divided into external method and built-in method again.Can be divided into according to the Anti-Jamming Technique difference: difference, polarity discriminating, directional couple, time-delay analysis, ultrahigh frequency, digital filtering and window etc.Wherein the built-in method of capacitive coupling need be installed in electrode sensor on the shield semiconductors layer, and the shortcoming of this mode maximum is an inner structure of having destroyed cable splice, makes cable insulation be subjected in various degree damage, is unfavorable for on-the-spot test.The external method of capacitive coupling: metal electrode is attached at the jacket outer surface of cable or joint, need not to contact any parts of cable or joint inside, thus do not influence original insulating property, and install also very simple.But because test frequency range broad (100kHz-100MHz) is easy to be subjected to external interference to influence, such as various communication facilitiess, motor car engine is disturbed or the like.Single-sensor in the inductive coupling method is meant the sensor measurement method that only is installed on the ground wire, and the local discharge signal on the coupling ground wire carries out software processes then.The shortcoming of the method is: corona discharge can't thoroughly be removed.Dual sensor method in the inductive coupling method, can reject corona by the mode that polarity is differentiated disturbs, improve antijamming capability, but the interference that comes on the ground wire can't be rejected, particularly on cross interconnected ground wire, because the undesired signal of other phase places is easy to interfere with tested cable splice by ground wire, cause erroneous judgement to be the joint internal discharge.
Summary of the invention
In order to overcome above-mentioned existing measuring method and technical deficiency, the object of the present invention is to provide a kind of power cable and joint partial discharge monitoring method, have the advantages that to strengthen interference free performance.
To achieve these goals, the technical solution used in the present invention is: a kind of power cable and joint partial discharge monitoring method, adopt three high frequency sensors, carrying out polarity in twos differentiates, the each discriminating all rejected part interference, what keep at last is the cable splice internal discharge, and it may further comprise the steps:
First, power cable is divided into the A phase, B mutually with C mutually, high frequency sensors 5 with the A phase, high frequency sensors 13 is enclosed within on the two ends cable body 1 of cable splice 8, make high frequency sensors 5, the direction unanimity of high frequency sensors 13, high frequency sensors 14 is enclosed within on the cable grounding line 9, make high frequency sensors 14 directions and high frequency sensors 5, high frequency sensors 13 direction unanimities, high frequency sensors 5, the signal output point of high frequency sensors 13 and high frequency sensors 14 is respectively an E, point F, point H, according to the connected mode of A phase, connect B phase and C high frequency sensors mutually, the high frequency sensors connection finishes;
Second, the high frequency sensors 5 that connects from the first step, high frequency sensors 13 and high frequency sensors 14 output points are connected to the input end that phase place is selected amplifying unit 21 with coaxial cable 19, each is 3 coaxial cables mutually, three-phase is totally 9 coaxial cables, phase place selects amplifying unit 21 and collecting unit 16 in same circuit board, finish inner the connection, locking phase generator 20 output terminals are connected to the input end of collecting unit 16, the output terminal of collecting unit 16 is connected to the input end of Test Host 18 by data bus 17, finishes whole hardware and connects;
The 3rd, open the system software of Test Host 18, at first, select the monocycle test procedure, its testing process is: select earlier " various parameters are set ", include: phase place is selected, and enlargement factor is 1 times, 10 times, 100 times, the filtered band scope is that 200KHz is to 50MHz, select " beginning test " to test after setting up parameter, " showing test results " shows with the form of raw data pulse diagram, is found out by the raw data pulse diagram, in the positive maximal value of the waveform of high frequency sensors 5 signal K constantly, the waveform of corresponding high frequency sensors 13 signal J is under the situation of negative value, be heteropolarity, be to be once discharge, otherwise think to disturb; Secondly, after the test monocycle, withdraw from the monocycle, enter 50 power frequency period test procedures from master routine, select successively " various parameters are set ", include: phase place is selected, and enlargement factor is 1 times, 10 times, 100 times, and the filtered band scope is that 200KHz is to 50MHz, selecting threshold value coefficient scope is 1.0 to 5.0, wherein when 50 power frequency periods were tested, locking phase generator 20 provided the zero phase moment of power frequency period when each the collection, guarantee each synchronism of gathering.
The 4th, in the discharge capacity that the 3rd pacing test result is kept, carrying out pulse polarity with high frequency sensors 5 and high frequency sensors 14 differentiates, after rejecting interference, keep remaining discharge capacity, high frequency sensors 13 is differentiated with the polarity that high frequency sensors 14 is carried out pulse once more, after rejecting is disturbed once more, keep remaining discharge capacity, this is the discharge capacity of cable splice inside.
Because the present invention adopts three high frequency sensors, carrying out polarity in twos differentiates, the each discriminating all rejected part interference, what keep at last is the cable splice internal discharge, so corona interference and ground wire to power cable disturb two interference sources that fine inhibition effect is arranged, and have strengthened the antijamming capability of system.
Description of drawings
Fig. 1 is the anti-interference schematic diagram of the present invention.
The hardware connection layout that Fig. 2 needs for the inventive method.
Fig. 3 is the inventive method at lab investigation pulse figure as a result.
Fig. 4 is the discharge spectrogram of the inventive method after analyzing successively with three high frequency sensors under the situation of laboratory.
Fig. 5 is a method of testing test flow chart of the present invention.
Specific implementation method
Below in conjunction with drawings and Examples the present invention is described in further detail.
Referring to Fig. 1,2, a kind of power cable and joint partial discharge monitoring method are with three high frequency sensors, carry out polarity in twos and differentiate, the each discriminating all rejected part interference, and what keep at last is the cable splice internal discharge, may further comprise the steps:
Power cable is divided into the A phase, B mutually with C mutually, respectively the people of cable splice place for doing defective, the simulated field discharge scenario, high frequency sensors 5 with the A phase, high frequency sensors 13 is enclosed within on the two ends cable body 1 of cable splice 8, make high frequency sensors 5, the direction unanimity of high frequency sensors 13, high frequency sensors 14 is enclosed within on the cable grounding line 9, make high frequency sensors 14 directions and high frequency sensors 5, high frequency sensors 13 direction unanimities, high frequency sensors 5, the signal output point of high frequency sensors 13 and high frequency sensors 14 is respectively an E, point F, some H is according to the connected mode of A phase, connect B phase and C sensor mutually, the sensor connection finishes; Be connected to the input end that phase place is selected amplifying unit 21 from high frequency sensors 5, high frequency sensors 13 and high frequency sensors 14 output points with coaxial cable 19, each is 3 coaxial cables mutually, three-phase is totally 9 coaxial cables, locking phase generator 20 output terminals are connected to the input end of collecting unit 16, because phase place selects amplifying unit 21 and collecting unit 16 in same circuit board, so inner the connection finishes, the output terminal of collecting unit 16 is connected to the input end of Test Host 18 by data bus 17, finishes whole hardware and connects.
Referring to Fig. 3, Fig. 3 is that certain measures monocycle impulse figure as a result, and being divided into is 5 little figure, and the horizontal ordinate of every width of cloth figure is the time point in a power frequency period, and ordinate is a pulse amplitude.Wherein Fig. 3 (a) and Fig. 3 (c) are the pulse diagrams after high frequency sensors 5, high frequency sensors 13 measured monocycle raw data are drawn back, and wherein Fig. 3 (b) and Fig. 3 (d) are the pulse diagram behind the corresponding software filtering; Find out that by the raw data pulse diagram two paths of signals is evident as the heteropolarity signal at synchronization, more obvious after the filtering; Fig. 3 (e) calculates the back by this measurement data and is drawn discharge information figure.On corresponding time point, discharge is arranged as seen from the figure, illustrate that native system can effective recognition go out discharge, and the position that discharge is concentrated in a power frequency period, respectively at second quadrant and four-quadrant, meet the feature of shelf depreciation fully.
Referring to Fig. 4, " the final discharge spectrogram of generation " is 50 power frequency period discharges of follow-on test spectrogram, and its horizontal ordinate is the phase point in the power frequency period, and ordinate is the discharge capacity size, each once discharge of some representative among the figure.There are three statistics the bottom promptly: maximum pd quantity is 13.8pC, and average discharge capacity is 2.31pC, and discharge time is 152 times.Data show that the minimum precision of system can arrive 0.01pC among the result who is tested.Minimum discharge capacity illustrate that native system measures minimum test value above 1pC below 1pC, meet the shelf depreciation requirement of power cable fully.
Referring to Fig. 5, the master routine of electric discharge includes monocycle test procedure and 50 power frequency period test procedures.The testing process of monocycle test procedure is: select earlier " various parameters are set ", for example select the A phase, selecting enlargement factor is 10 times, it is that 500KHz is to 40MHz that filtered band is provided with scope, select " beginning test " to test after setting up parameter, " show test results " with the form demonstration of raw data pulse diagram, find out by the raw data pulse diagram, the waveform signal of high frequency sensors 5 signal K and high frequency sensors 13 signal J is evident as the heteropolarity signal at synchronization, more obvious after the filtering, whether have the standard of discharge be: in the positive maximal value of the waveform of sensor signal K constantly if judging, the waveform of respective sensor signal J is under the situation of negative value, being heteropolarity, is to be once discharge.After the test monocycle, withdraw from the monocycle, enter 50 power frequency period test procedures from master routine, select successively " various parameters are set ", for example selecting current test phase is the A phase, enlargement factor is selected 10 times, selecting the filtered band scope is that 300KHz is to 40MHz, selecting threshold value coefficient scope is 1.5, and " synchronous phase signal triggering " is chosen as the external trigger pattern, triggering collection behind " synchronous acquisition " wait synchronous phase signal, after " show this test spectrogram " select to check real-time testing spectrogram function, native system generates this electric discharge spectrogram automatically, after " generating final discharge spectrogram " gathered and finished, and the final discharge spectrogram that system can generate automatically.
Embodiment
A kind of power cable and joint partial discharge monitoring method may further comprise the steps:
First, power cable is divided into the A phase, B mutually with C mutually, high frequency sensors 5 with the A phase, high frequency sensors 13 is enclosed within on the two ends cable body 1 of cable splice 8, make high frequency sensors 5, the direction unanimity of high frequency sensors 13, high frequency sensors 14 is enclosed within on the cable grounding line 9, make high frequency sensors 14 directions and high frequency sensors 5, high frequency sensors 13 direction unanimities, high frequency sensors 5, the signal output point of high frequency sensors 13 and high frequency sensors 14 is respectively an E, point F, point H, according to the connected mode of A phase, connect B phase and C high frequency sensors mutually, the high frequency sensors connection finishes;
Second, the high frequency sensors 5 that connects from the first step, high frequency sensors 13 and high frequency sensors 14 output points are connected to the input end that phase place is selected amplifying unit 21 with coaxial cable 19, each is 3 coaxial cables mutually, three-phase is totally 9 coaxial cables, locking phase generator 20 output terminals are connected to the input end of collecting unit 16, because the position selects amplifying unit 21 and collecting unit 16 in same circuit board, so inner the connection finishes, the output terminal of collecting unit 16 is connected to the input end of Test Host 18 by data bus 17, finishes whole hardware and connects;
The 3rd, open the system software of Test Host 18, the three-phase of tested power cable is added high pressure simultaneously, at first, select the monocycle test procedure, its testing process is: select earlier " various parameters are set ": select the A phase, selecting enlargement factor is 10 times, and it is that 500KHz is to 40MHz that filtered band is provided with scope; Select " beginning test " to test after setting up parameter, " show test results " with the form demonstration of raw data pulse diagram, find out by the raw data pulse diagram, the waveform signal of high frequency sensors 5 signal K and high frequency sensors 13 signal J is evident as the heteropolarity signal at synchronization, more obvious after the filtering, whether judge has the standard of discharge to be, in the positive maximal value of the waveform of high frequency sensors 5 signal K constantly, the waveform of corresponding high frequency sensors 13 signal J is under the situation of negative value, being heteropolarity, is to be once discharge; Secondly, after the test monocycle, withdraw from the monocycle, enter 50 power frequency period test procedures from master routine, select successively " various parameters are set ": selecting current test phase is the A phase, enlargement factor is selected 10 times, select the filtered band scope be 300KHz to 40MHz, selecting threshold value coefficient scope is 1.5, " synchronous phase signal triggering " is chosen as the external trigger pattern, triggering collection behind " synchronous acquisition " wait synchronous phase signal, after " show this test spectrogram " selected to check real-time testing spectrogram function, native system generated this electric discharge spectrogram automatically, and maximum pd quantity is 15.09pC, average discharge capacity is 0.97pC, and discharge time is 3893 times; " generate final discharge spectrogram " checks generation that native system generates the automatically spectrogram that finally discharges; Maximum pd quantity is 13.8pC, and average discharge capacity is 2.31pC, and discharge time is 152 times;
The 4th, in the discharge capacity that the 3rd step institute's test result is kept, carrying out pulse polarity with high frequency sensors 5 and high frequency sensors 14 differentiates, after rejecting interference, keep remaining discharge capacity, high frequency sensors 13 is differentiated with the polarity that high frequency sensors 14 is carried out pulse once more, after rejecting is disturbed once more, keep remaining discharge capacity, this is the discharge of cable splice inside.
Above laboratory test results shows: from the monocycle data, the present invention can tell the heteropolarity discharge signal effectively, rejects the same polarity undesired signal; From former and later two discharge spectrum analysis, compare discharge time and obviously reduce, show that totally the present invention can effectively reject the ground wire interference and corona discharge disturbs two big interference sources, the reliability of enhanced system and accuracy.
Among the figure: 1 is cable body; 2 is core; 3 is screen layer; 4 is coil; 5 is high frequency sensors; 6 is coaxial line; 7 is inner discharge; 8 is cable connector; 9 is earth connection; 10 is the earth connection interfering signal; 11 is the signal ground wire; 12 is the corona interfering signal; 13 is high frequency sensors; 14 is high frequency sensors; 15 is three road signals of a phase; 16 is collecting unit; 17 is the data bus; 18 is Test Host; 19 is coaxial line; 20 is synchronous phase generate device; 21 is the Selecting phasing amplifying unit; 22 is the I/O control signal.
Claims (1)
1. power cable and joint partial discharge monitoring method is characterized in that, adopt three high frequency sensors, carry out polarity in twos and differentiate, differentiate that all rejecting a part disturbs at every turn, and reservation is the cable splice internal discharge at last, and it may further comprise the steps:
First, power cable is divided into the A phase, B mutually with C mutually, high frequency sensors (5) with the A phase, high frequency sensors (13) is enclosed within on the two ends cable body (1) of cable splice (8), make high frequency sensors (5), the direction unanimity of high frequency sensors (13), high frequency sensors (14) is enclosed within on the cable grounding line (9), make high frequency sensors (14) direction and high frequency sensors (5), high frequency sensors (13) direction unanimity, high frequency sensors (5), the signal output point of high frequency sensors (13) and high frequency sensors (14) is respectively point (E), point (F), point (H), according to the connected mode of A phase, connect B phase and C high frequency sensors mutually;
Second, the high frequency sensors that from the first step, connects (5), high frequency sensors (13) and high frequency sensors (14) output point are connected to the input end that phase place is selected amplifying unit (21) with coaxial cable (19), wherein each is (3) root coaxial cable, three-phase is (9) root coaxial cable altogether, phase place selects amplifying unit (21) and collecting unit (16) in same circuit board, finish inner the connection, locking phase generator (20) output terminal is connected to the input end of collecting unit (16), and the output terminal of collecting unit (16) is connected to the input end of Test Host (18) by data bus (17);
The 3rd, open the system software of Test Host (18), at first, select the monocycle test procedure, its testing process is: select earlier " various parameters are set ", include: phase place is selected, enlargement factor is 1 times, 10 times, 100 times, the filtered band scope is that 200KHz is to 50MHz, select " beginning test " to test after setting up parameter, " show test results " with the form demonstration of raw data pulse diagram, find out by the raw data pulse diagram, if the waveform of high frequency sensors 5 signals (K) and high frequency sensors 13 signals (J) is evident as the heteropolarity signal at synchronization, the heteropolarity of two-way waveform is more obvious after the filtering, in the positive maximal value of the waveform of high frequency sensors 5 signals (K) constantly, the waveform of corresponding high frequency sensors 13 signals (J) is under the situation of negative value, be heteropolarity, be to be once discharge, otherwise think to disturb; Secondly, after the test monocycle, withdraw from the monocycle, enter 50 power frequency period test procedures from master routine, select successively " various parameters are set ", phase place is selected, and enlargement factor is 1 times, 10 times, 100 times, and the filtered band scope is that 200KHz is to 50MHz, selecting threshold value coefficient scope is 1.0 to 5.0, wherein when 50 power frequency periods were tested, locking phase generator 20 provided the zero phase moment of power frequency period when each the collection, guarantee each synchronism of gathering;
The 4th, in the discharge capacity that the 3rd step institute's test result is kept, carrying out pulse polarity with high frequency sensors (5) and high frequency sensors (14) differentiates, after rejecting interference, keep remaining discharge capacity, high frequency sensors (13) is differentiated with the polarity that high frequency sensors (14) is carried out pulse once more, after rejecting is disturbed once more, keep remaining discharge capacity, this is the discharge capacity of cable splice inside.
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| CN102221665A (en) * | 2011-03-21 | 2011-10-19 | 江苏省电力公司无锡供电公司 | Power cable partial discharge detection contrast method |
| CN102866329A (en) * | 2012-09-05 | 2013-01-09 | 西安博源电气有限公司 | GIS (Geographic Information System) local discharge monitoring device and method utilizing voltage sharing springs as detectors |
| CN103267931A (en) * | 2013-04-19 | 2013-08-28 | 国家电网公司 | Method for positioning intersecting interconnection cable intermediate head partial discharge |
| CN103901327A (en) * | 2014-03-17 | 2014-07-02 | 华南理工大学 | Detection method used for partial discharge of 10KV distribution network XLPE cable |
| CN103913679A (en) * | 2014-03-03 | 2014-07-09 | 国联思创（北京）科技有限公司 | Online monitoring system for partial discharge of high-voltage switch cabinet |
| WO2016019666A1 (en) * | 2014-08-07 | 2016-02-11 | 国家电网公司 | Method and device for detecting partial discharge of cable |
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| CN102221665A (en) * | 2011-03-21 | 2011-10-19 | 江苏省电力公司无锡供电公司 | Power cable partial discharge detection contrast method |
| CN102866329A (en) * | 2012-09-05 | 2013-01-09 | 西安博源电气有限公司 | GIS (Geographic Information System) local discharge monitoring device and method utilizing voltage sharing springs as detectors |
| CN102866329B (en) * | 2012-09-05 | 2014-12-24 | 西安博源电气有限公司 | GIS (Geographic Information System) local discharge monitoring device and method utilizing voltage sharing springs as detectors |
| CN103267931A (en) * | 2013-04-19 | 2013-08-28 | 国家电网公司 | Method for positioning intersecting interconnection cable intermediate head partial discharge |
| CN103913679A (en) * | 2014-03-03 | 2014-07-09 | 国联思创（北京）科技有限公司 | Online monitoring system for partial discharge of high-voltage switch cabinet |
| CN103901327B (en) * | 2014-03-17 | 2017-01-18 | 华南理工大学 | Detection method used for partial discharge of 10KV distribution network XLPE cable |
| CN103901327A (en) * | 2014-03-17 | 2014-07-02 | 华南理工大学 | Detection method used for partial discharge of 10KV distribution network XLPE cable |
| WO2016019666A1 (en) * | 2014-08-07 | 2016-02-11 | 国家电网公司 | Method and device for detecting partial discharge of cable |
| CN105334433A (en) * | 2014-08-07 | 2016-02-17 | 国家电网公司 | Cable partial discharge detection method and device |
| CN106950482A (en) * | 2017-05-09 | 2017-07-14 | 广东电网有限责任公司珠海供电局 | A kind of corona ELIMINATION OF ITS INTERFERENCE method based on alternate signal collection of illustrative plates similarity relation |
| CN106950482B (en) * | 2017-05-09 | 2019-03-29 | 广东电网有限责任公司珠海供电局 | A kind of corona interference elimination method based on alternate signal map similarity relation |
| 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 |
| CN110488160A (en) * | 2019-04-26 | 2019-11-22 | 云南电网有限责任公司电力科学研究院 | A kind of cable insulation damage detecting method and cable insulation damage detection apparatus |
| CN110488160B (en) * | 2019-04-26 | 2021-07-06 | 云南电网有限责任公司电力科学研究院 | Cable insulation damage detection method and cable insulation damage detection device |
| 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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