CN103267931B - Method for positioning intersecting interconnection cable intermediate head partial discharge - Google Patents
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Abstract
The invention relates to a method for positioning intersecting interconnection cable intermediate head partial discharge. The method comprises the following steps that firstly, pliers-type HFCTs are installed at different positions on an intersecting interconnection line, and current signals on the intersecting interconnection line are detected through the pliers-type HFCTs; secondly, filtering process is carried out on the current signals detected by the pliers-type HFCTs, a noise signal is removed, and discharging signals are conveyed to an oscilloscope; lastly, the amplitude and the phase of detected discharge pulse signals at different positions are compared through a DPAP method, the result is logically analyzed, and a discharge power source can be positioned. The method adopts the DPAP comparing method based on the electromagnetic coupling technology, the problem that partial signals of the cable intersecting interconnection line are interfered mutually is solved, and the detection of the method is high in detecting accuracy, safe and reliable.
Description
Technical field
The present invention relates to a kind of detection method, especially a kind of localization method of cross interconnected cable intermediate head partial discharge, belong to the technical field that power cable detects.
Background technology
XLPE cable (XLPE) cable is in manufacture and joint manufacturing process, and the defects such as the impurity that insulation course inside occurs, micropore, semi-conductive layer projection and layering, all can cause the generation of shelf depreciation.Shelf depreciation develops into electricity tree through accumulation, finally causes puncturing of major insulation.If just can be able to be found at the initial stage of apparatus insulated deterioration, then can take precautions against in possible trouble.Cable local discharge fault great majority betide cable accessory place, especially intermediate head.The method of also measure local electric discharge is a lot, such as method of difference, direction coupled method, Electromagnetic coupling method, ultrahigh frequency inductive coupling method etc., when adopting method of difference to measure, high-frequency signal is worked as serious at cable distribution decling phase, so that reduce detection sensitivity, the test duration is long, and method of testing has limitation.When adopting direction coupled method to measure, implant on cable insulation by sensor, destroy the metal sealing waterproof of outside, Application comparison is few.When adopting Electromagnetic coupling method to measure, during high-frequency signal transmission, attenuation ratio is comparatively serious, needs to measure near cable splice as far as possible, otherwise affects sensitivity.When adopting ultrahigh frequency coupled method to measure, ultra-high frequency signal attenuation ratio low frequency is much serious, therefore on-line monitoring need be installed multiple sensor and try one's best near cable splice or end.In addition, also cable top layer is destroyed.When adopting ultrasonic Detection Method to measure, sensitivity is low.The test repeatability of Electromagnetic coupling method is better, have simultaneously small and exquisite flexibly, handling safety, antijamming capability be strong, can reflect the advantages such as pulse waveform more really, by investigation and application widely.
When high-voltage cross-linking polythene cable circuit is longer, usual employing protective metal shell cross connection grounding, this method cable line is divided into some large section, every large section is divided into three equal segments of length in principle, install isolating joint between every segment, out of phase protective metal shell adopts scissors crossing method to carry out transposition with coaxial cross interconnected line to connect namely cross interconnected by the insulating barrier both sides often overlapping isolating joint.Because threephase cable intermediate head is interconnected by cross interconnected line, when a certain phase cable splice generation shelf depreciation, its local discharge signal can pass on other two-phase cable bodies by cross interconnected line, the local discharge signal of cable has occurred disturbing problem mutually, makes the detection of this kind of system shelf depreciation become complex.At present, domesticly there is no effective detection method.
The Partial Discharge Sources of XLPE power cable insulation inside can be regarded as a some pulse signal source, when insulating inner produces shelf depreciation, the high-frequency electromagnetic pulse produced of discharging is propagated to different directions along cable conductor and the outer armor of cable simultaneously, in communication process, high-frequency electromagnetic pulse there will be decay.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of localization method of cross interconnected cable intermediate head partial discharge is provided, based on magnetic coupling techniques, adopt the amplitude phase place of DPAP(diverse location) pairing comparision, the Partial discharge signal that can solve the cross interconnected line of cable disturbs problem mutually, its detection accuracy is high, safe and reliable.
The technical solution used in the present invention is as follows:
A kind of cross interconnected cable intermediate head partial discharge localization method, comprises the steps:
Step (1) installs jaw type HFCT on the cross interconnected line of diverse location, is detected the discharge pulse current signal on cross interconnected line by jaw type HFCT;
Discharge pulse current signal is delivered to oscillograph after processing jaw type HFCT institute measuring electric pulse current signal by step (2);
Step (3) adopts DPAP method, contrasts, carry out logic analysis, then position discharge source result the amplitude of diverse location institute measuring electric signal, phase place.
Described jaw type HFCT is in the nature Rogowski coil, utilizes electromagnetic induction principle to detect shelf depreciation.
Described jaw type HFCT has directivity, and when mounted, its direction of arrow all points to cross interconnected case.
The cross interconnected line of step (1) described diverse location refers to that cable intermediate joint is IJ type, this type of intermediate head contains and two ends metallic shield is connected the insulating washer cut off, therefore, for three-phase intermediate head, total six roots of sensation metallic shield extension line, be respectively the left side extension line A1 of A phase intermediate head, the right side extension line A2 of A phase intermediate head, the left side extension line B1 of B phase intermediate head, the right side extension line B2 of A phase intermediate head, the left side extension line C1 of C phase intermediate head, the right side extension line C2 of C phase intermediate head, this six roots of sensation extension line is undertaken interconnected by cross interconnected case, interconnected order is that extension line A1 and extension line B2 are interconnected, extension line B1 is connected with extension line C2, extension line C1 and extension line A2 is interconnected, during use, respectively at extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, jaw type HFCT is placed at extension line C2 place, the discharge pulse current signal in metallic shield extension line is detected by jaw type HFCT.
The detailed process of described step (2) is as follows: described carries out filtering process to jaw type HFCT institute measuring electric pulse current signal, rejects noise signal, institute's measuring electric pulse current signal is reached oscillograph by concentric cable.
The detailed process of described step (3) is as follows: carry out time-domain analysis to discharge pulse current signal, utilize the waveform of DPAP Measures compare 6 discharge pulse current signals, amplitude and phase relation; And the discharge pulse current signal a1 of extension line A1 represents, the discharge pulse current signal a2 of extension line A2 represents, the discharge pulse current signal b1 of extension line B1 represents, the discharge pulse current signal b2 of extension line B2 represents, the discharge pulse current signal c1 of extension line C1 represents, extension line C2 discharge pulse current signal c2 represents, concrete comparative approach is as follows:
The detailed process of described step (3) is as follows: carry out time-domain analysis to discharge pulse current signal, utilize the waveform of DPAP Measures compare 6 discharge pulse current signals, amplitude and phase relation; And the discharge pulse current signal a1 of extension line (A1) represents, the discharge pulse current signal a2 of extension line A2 represents, the discharge pulse current signal b1 of extension line B1 represents, the discharge pulse current signal b2 of extension line (B2) represents, the discharge pulse current signal c1 of extension line (C1) represents, extension line C2 discharge pulse current signal c2 represents, concrete comparative approach is as follows:
If meet 1 signal a1 and signal a2 homophase, amplitude is equal; 2 signal a1 and signal b2 are anti-phase, and signal a1 amplitude is greater than signal b2; 3 signal a2 and signal c1 are anti-phase, and signal a2 amplitude is greater than signal c1; 4 extension line B1 and extension line C2 no pulse; During consistent this 5 conditions of 5 signal a1, signal a2, signal c1, signal b2 waveform, judge that the intermediate head of A phase exists shelf depreciation;
If meet 1 signal b1 and signal b2 homophase, amplitude is equal; 2 signal b1 and signal c2 are anti-phase, and signal b1 amplitude is greater than signal c2; 3 signal b2 and signal a1 are anti-phase, and signal b2 amplitude is greater than signal a1; 4 extension line C1 and extension line A2 no pulse; During consistent this 5 conditions of 5 signal b1, signal b2, signal a1, signal c2 waveform, judge that the intermediate head of B phase exists shelf depreciation;
If meet 1 signal c1 and signal c2 homophase, amplitude is equal; 2 signal c1 and signal a2 are anti-phase, and signal c1 amplitude is greater than signal a2; 3 signal c2 and signal b1 are anti-phase, and signal c2 amplitude is greater than signal b1; 4 extension line A1 and extension line B2 no pulse; During consistent this 5 conditions of 5 signal c1, signal c2, signal b1, signal a2 waveform, judge that the intermediate head of C phase exists shelf depreciation;
If all there is pulse in satisfied 1 extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; 2 signal a1 and signal b2 are anti-phase; 3 signal a2 and signal c1 are anti-phase, and signal a2 amplitude is greater than signal c1; 4 signal b1 and signal c2 are anti-phase, and signal b1 amplitude is greater than signal c2; 5 signal b1 are consistent with signal c2 waveform, signal a2 and signal c1 waveform consistent this 5 conditions time, judge that A phase and the intermediate head of B phase exist shelf depreciation;
If all there is pulse in satisfied 1 extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; 2 signal a2 and signal c1 are anti-phase; 3 signal a1 and signal b2 are anti-phase, and signal a1 amplitude is greater than signal b2; 4 signal c2 and signal b1 are anti-phase, and signal c2 amplitude is greater than signal b1; 5 signal b1 are consistent with signal c2 waveform, signal a1 and signal b2 waveform consistent this 5 conditions time, judge that A phase and the intermediate head of C phase exist shelf depreciation;
If all there is pulse in satisfied 1 extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; 2 signal b1 and signal c2 are anti-phase; 3 signal b2 and signal a1 are anti-phase, and signal b2 amplitude is greater than signal a1; 4 signal c1 and signal a2 are anti-phase, and signal c1 amplitude is greater than signal a2; 5 signal b2 are consistent with signal a1 waveform, signal c1 and signal a2 waveform consistent this 5 conditions time, judge that B phase and the intermediate head of C phase exist shelf depreciation;
If all there is pulse in satisfied 1 extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; 2 signal a1 and signal b2 are anti-phase; 3 signal b1 and signal c2 are anti-phase; 4 signal c1 and signal a2 are anti-phase; When 5 signal b2 and signal a1, signal c1 and signal a2 amplitude contrast this 5 conditions irregular, judge that A phase, B phase and the intermediate head of C phase all exist shelf depreciation.
The Chinese of described HFCT is High Frequency Current Sensor.
Beneficial effect of the present invention:
When adopting high-frequency current method to carry out Partial Discharge Detection to cross interconnected cable intermediate joint, if there is shelf depreciation in certain phase intermediate head, its discharge pulse can conduct to other phases along cross interconnected line, severe jamming is produced to the Partial Discharge Detection of other phases, be difficult to accurately locate local point of discharge, the present invention is based on the attenuation principle of high-frequency discharge pulsed current signal, by gathering discharge current signal on the cross interconnected line of diverse location, utilize amplitude and the phase place of DPAP Measures compare diverse location signal, simple fast shelf depreciation in intermediate head can be positioned, successfully solve discharge pulse interference problem in cross interconnected line, improve the accuracy of cross interconnected cable intermediate head partial discharge location.The present invention's checkout equipment used has ubiquity, simple to operate, and detection method provided by the present invention is easy-to-understand, convenient and swift, is convenient to technician and grasps, and is easy to promote.
Accompanying drawing explanation
Fig. 1. the six roots of sensation metallic shield extension line schematic diagram of three-phase intermediate head.
The interconnected sequential schematic of Fig. 2 six roots of sensation extension line.
1 insulating washer in figure, the left side extension line of A1:A phase intermediate head, the right side extension line of A1:A phase intermediate head, the left side extension line of B1:B phase intermediate head, the right side extension line B2 of B2:B phase intermediate head, the left side extension line of C1:C phase intermediate head, the right side extension line of C2:C phase intermediate head.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described:
A kind of cross interconnected cable intermediate head partial discharge localization method, comprises the steps:
Step (1) installs jaw type HFCT on the cross interconnected line of diverse location, detects the current signal on cross interconnected line by jaw type HFCT;
Discharge pulse current signal is delivered to oscillograph after processing jaw type HFCT institute measuring electric pulse current signal by step (2);
Step (3) adopts DPAP method, contrasts, carry out logic analysis, then position discharge source result the amplitude of diverse location institute measuring electric signal, phase place.
Jaw type HFCT is in the nature Rogowski coil, utilizes electromagnetic induction principle to detect shelf depreciation.
Jaw type HFCT has directivity, and when mounted, its direction of arrow all points to cross interconnected case.
The cross interconnected line of described diverse location refers to, cable intermediate joint is IJ type, this type of intermediate head contains and two ends metallic shield is connected the insulating washer 1 cut off, therefore, for three-phase intermediate head, total six roots of sensation metallic shield extension line, be respectively the left side extension line A1 of A phase intermediate head, the right side extension line A2 of A phase intermediate head, the left side extension line B1 of B phase intermediate head, the right side extension line B2 of A phase intermediate head, the left side extension line C1 of C phase intermediate head, the right side extension line C2 of C phase intermediate head, this six roots of sensation extension line is undertaken interconnected by cross interconnected case, interconnected order is that extension line A1 and extension line B2 are interconnected, extension line B1 is connected with extension line C2, extension line C1 and extension line A2 is interconnected.
Cross interconnected cable intermediate head partial discharge localization method, concrete steps are as follows: place jaw type HFCT at extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2 place first respectively, the discharge pulse current signal in metallic shield extension line is detected by jaw type HFCT, oscillograph is reached by concentric cable, time-domain analysis is carried out to discharge pulse current signal, utilizes the waveform of DPAP Measures compare 6 discharge pulse current signals, amplitude and phase relation; And the discharge pulse current signal a1 of extension line A1 represents, the discharge pulse current signal a2 of extension line A2 represents, the discharge pulse current signal b1 of extension line B1 represents, the discharge pulse current signal b2 of extension line B2 represents, the discharge pulse current signal c1 of extension line C1 represents, extension line C2 discharge pulse current signal c2 represents, concrete comparative approach is as follows:
The detailed process of described step (3) is as follows: carry out time-domain analysis to discharge pulse current signal, utilize the waveform of DPAP Measures compare 6 discharge pulse current signals, amplitude and phase relation; And the discharge pulse current signal (a1) of extension line (A1) represents, the discharge pulse current signal (a2) of extension line (A2) represents, the discharge pulse current signal (b1) of extension line (B1) represents, the discharge pulse current signal (b2) of extension line (B2) represents, the discharge pulse current signal (c1) of extension line (C1) represents, extension line (C2) discharge pulse current signal (c2) represents, concrete comparative approach is as follows:
If meet (1) signal a1 and signal a2 homophase, amplitude is equal; (2) signal a1 and signal b2 is anti-phase, and signal a1 amplitude is greater than signal b2; (3) signal a2 and signal c1 is anti-phase, and signal a2 amplitude is greater than signal c1; (4) extension line B1 and extension line C2 no pulse; (5), during consistent this 5 conditions of signal a1, signal a2, signal c1, signal b2 waveform, judge that the intermediate head of A phase exists shelf depreciation;
If meet (1) signal b1 and signal b2 homophase, amplitude is equal; (2) signal b1 and signal c2 is anti-phase, and signal b1 amplitude is greater than signal c2; (3) signal b2 and signal a1 is anti-phase, and signal b2 amplitude is greater than signal a1; (4) extension line C1 and extension line A2 no pulse; (5), during consistent this 5 conditions of signal b1, signal b2, signal a1, signal c2 waveform, judge that the intermediate head of B phase exists shelf depreciation;
If meet (1) signal c1 and signal c2 homophase, amplitude is equal; (2) signal c1 and signal a2 is anti-phase, and signal c1 amplitude is greater than signal a2; (3) signal c2 and signal b1 is anti-phase, and signal c2 amplitude is greater than signal b1; (4) extension line A1 and extension line B2 no pulse; (5), during consistent this 5 conditions of signal c1, signal c2, signal b1, signal a2 waveform, judge that the intermediate head of C phase exists shelf depreciation;
If all there is pulse in satisfied (1) extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2) signal a1 and signal b2 is anti-phase; (3) signal a2 and signal c1 is anti-phase, and signal a2 amplitude is greater than signal c1; (4) signal b1 and signal c2 is anti-phase, and signal b1 amplitude is greater than signal c2; (5), when signal b1, signal a2 consistent with signal c2 waveform and consistent this 5 conditions of signal c1 waveform, judge that A phase and the intermediate head of B phase exist shelf depreciation;
If all there is pulse in satisfied (1) extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2) signal a2 and signal c1 is anti-phase; (3) signal a1 and signal b2 is anti-phase, and signal a1 amplitude is greater than signal b2; (4) signal c2 and signal b1 is anti-phase, and signal c2 amplitude is greater than signal b1; (5), when signal b1, signal a1 consistent with signal c2 waveform and consistent this 5 conditions of signal b2 waveform, judge that A phase and the intermediate head of C phase exist shelf depreciation;
If all there is pulse in satisfied (1) extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2) signal b1 and signal c2 is anti-phase; (3) signal b2 and signal a1 is anti-phase, and signal b2 amplitude is greater than signal a1; (4) signal c1 and signal a2 is anti-phase, and signal c1 amplitude is greater than signal a2; (5), when signal b2, signal c1 consistent with signal a1 waveform and consistent this 5 conditions of signal a2 waveform, judge that B phase and the intermediate head of C phase exist shelf depreciation;
If all there is pulse in satisfied (1) extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2) signal a1 and signal b2 is anti-phase; (3) signal b1 and signal c2 is anti-phase; (4) signal c1 and signal a2 is anti-phase; (5), when signal b2 and signal a1, signal c1 and signal a2 amplitude contrast this 5 conditions irregular, judge that A phase, B phase and the intermediate head of C phase all exist shelf depreciation.
The present invention is by the contrast of above-mentioned discharge pulse amplitude, phase place, waveform, and can be simple and quick position the intermediate head that there is shelf depreciation, the signal solving cross interconnected line disturbs problem mutually.
Claims (3)
1. a localization method for cross interconnected cable intermediate head partial discharge, is characterized in that, comprises the steps:
Step 1 installs jaw type HFCT on the cross interconnected line of diverse location, is detected the discharge pulse current signal on cross interconnected line by jaw type HFCT;
After step 2 pair jaw type HFCT institute measuring electric pulse current signal carries out filtering process, discharge pulse current signal is delivered to oscillograph;
Step 3 adopts DPAP method, i.e. the amplitude Phase contrast of diverse location, contrasts, carry out logic analysis, then position discharge source result the amplitude of the discharge pulse current signal that diverse location is surveyed, phase place;
The cable intermediate joint of cross interconnected line described in step 1 adopts IJ type, this type of intermediate head contains and two ends metallic shield is connected the insulating washer cut off, therefore, for three-phase intermediate head, total six roots of sensation metallic shield extension line, be respectively the left side extension line A1 of A phase intermediate head, the right side extension line A2 of A phase intermediate head, the left side extension line B1 of B phase intermediate head, the right side extension line A2 of A phase intermediate head, the left side extension line C1 of C phase intermediate head, the right side extension line C2 of C phase intermediate head, this six roots of sensation extension line is undertaken interconnected by cross interconnected case, interconnected order is that extension line A1 and extension line B2 are interconnected, extension line B1 and extension line C2 is interconnected, extension line C1 and extension line A2 is interconnected, during use, respectively at extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, jaw type HFCT is placed at extension line C2 place, the discharge pulse current signal in metallic shield extension line is detected by jaw type HFCT,
The detailed process of step 3 is as follows:
Time-domain analysis is carried out to discharge pulse current signal, utilizes the waveform of DPAP Measures compare 6 discharge pulse current signals, amplitude and phase relation; And the discharge pulse current signal a1 of extension line A1 represents, the discharge pulse current signal a2 of extension line A2 represents, the discharge pulse current signal b1 of extension line B1 represents, the discharge pulse current signal b2 of extension line B2 represents, the discharge pulse current signal c1 of extension line C1 represents, extension line C2 discharge pulse current signal c2 represents, concrete comparative approach is as follows:
If meet (1). signal a1 and signal a2 homophase, amplitude is equal; (2). signal a1 and signal b2 is anti-phase, and signal a1 amplitude is greater than signal b2; (3). signal a2 and signal c1 is anti-phase, and signal a2 amplitude is greater than signal c1; (4). extension line B1 and extension line C2 no pulse; (5). during consistent this 5 conditions of signal a1, signal a2, signal c1, signal b2 waveform, judge that the intermediate head of A phase exists shelf depreciation;
If meet (1). signal b1 and signal b2 homophase, amplitude is equal; (2). signal b1 and signal c2 is anti-phase, and signal b1 amplitude is greater than signal c2; (3). signal b2 and signal a1 is anti-phase, and signal b2 amplitude is greater than signal a1; (4). extension line C1 and extension line A2 no pulse; (5). during consistent this 5 conditions of signal b1, signal b2, signal a1, signal c2 waveform, judge that the intermediate head of B phase exists shelf depreciation;
If meet (1). signal c1 and signal c2 homophase, amplitude is equal; (2). signal c1 and signal a2 is anti-phase, and signal c1 amplitude is greater than signal a2; (3). signal c2 and signal b1 is anti-phase, and signal c2 amplitude is greater than signal b1; (4). extension line A1 and extension line B2 no pulse; (5). during consistent this 5 conditions of signal c1, signal c2, signal b1, signal a2 waveform, judge that the intermediate head of C phase exists shelf depreciation;
If meet (1). all there is pulse in extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2). signal a1 and signal b2 is anti-phase; (3). signal a2 and signal c1 is anti-phase, and signal a2 amplitude is greater than signal c1; (4). signal b1 and signal c2 is anti-phase, and signal b1 amplitude is greater than signal c2; (5). signal b1 is consistent with signal c2 waveform, signal a2 and signal c1 waveform consistent this 5 conditions time, judge that A phase and the intermediate head of B phase exist shelf depreciation;
If meet (1). all there is pulse in extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2). signal a2 and signal c1 is anti-phase; (3). signal a1 and signal b2 is anti-phase, and signal a1 amplitude is greater than signal b2; (4). signal c2 and signal b1 is anti-phase, and signal c2 amplitude is greater than signal b1; (5). signal b1 is consistent with signal c2 waveform, signal a1 and signal b2 waveform consistent this 5 conditions time, judge that A phase and the intermediate head of C phase exist shelf depreciation;
If meet (1). all there is pulse in extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2). signal b1 and signal c2 is anti-phase; (3). signal b2 and signal a1 is anti-phase, and signal b2 amplitude is greater than signal a1; (4). signal c1 and signal a2 is anti-phase, and signal c1 amplitude is greater than signal a2; (5). signal b2 is consistent with signal a1 waveform, signal c1 and signal a2 waveform consistent this 5 conditions time, judge that B phase and the intermediate head of C phase exist shelf depreciation;
If meet (1). all there is pulse in extension line A1, extension line A2, extension line B1, extension line B2, extension line C1, extension line C2; (2). signal a1 and signal b2 is anti-phase; (3). signal b1 and signal c2 is anti-phase; (4). signal c1 and signal a2 is anti-phase; (5). when signal b2 and signal a1, signal c1 and signal a2 amplitude contrast this 5 conditions irregular, judge that A phase, B phase and the intermediate head of C phase all exist shelf depreciation.
2. the localization method of a kind of cross interconnected cable intermediate head partial discharge according to claim 1, it is characterized in that: described jaw type HFCT is in the nature Rogowski coil, electromagnetic induction principle is utilized to detect shelf depreciation, and jaw type HFCT has directivity, when mounted, its direction of arrow all points to cross interconnected case.
3. the localization method of a kind of cross interconnected cable intermediate head partial discharge according to claim 1, it is characterized in that: the detailed process of described step 2 is as follows: described processes jaw type HFCT institute measuring electric pulse current signal, reject noise signal, institute's measuring electric pulse current signal is reached oscillograph by concentric cable.
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| CN103983853B (en) * | 2014-05-09 | 2018-03-20 | 国家电网公司 | A kind of cross interconnected system phase inspection method of high-tension cable |
| CN103954894B (en) * | 2014-05-12 | 2017-01-18 | 国家电网公司 | Partial discharge locating method for three-phase crossed and interconnected cables |
| CN106872860B (en) * | 2015-12-14 | 2020-07-21 | 中国电力科学研究院 | Cable line partial discharge signal identification and phase judgment method |
| CN108802583A (en) * | 2018-06-26 | 2018-11-13 | 西安开天电气可靠性实验室有限公司 | A kind of electric railway high pressure feeder cable partial discharge monitoring method |
| CN110658429B (en) * | 2019-11-03 | 2021-03-23 | 西南交通大学 | Method for estimating length of electric branch in crosslinked polyethylene cable insulation of power distribution network |
| CN112946521A (en) * | 2021-02-04 | 2021-06-11 | 重庆景文源智科技有限公司 | Power distribution network cable leakage current online detection method and insulation state monitoring method |
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| JPH08152453A (en) * | 1994-11-28 | 1996-06-11 | Sumitomo Electric Ind Ltd | Measuring method for partial discharge |
| CN101710166B (en) * | 2009-09-15 | 2011-11-30 | 西安博源电气有限公司 | Method for monitoring partial discharge of power cable connector on line |
| 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 |
| CN102495340A (en) * | 2011-12-06 | 2012-06-13 | 山东电力集团公司青岛供电公司 | Online power cable partial discharge monitoring system based on electromagnetic waves and high-frequency current transformer (CT) |
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