CN103267931A - 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 joint shelf depreciation belongs to the technical field that power cable detects.
Background technology
XLPE cable (XLPE) cable is in manufacturing and joint manufacturing process, and the inner defectives such as impurity, micropore, semi-conductive layer projection and layering that occur of insulation course all can cause the generation of shelf depreciation.Shelf depreciation develops into the electricity tree through accumulation, finally causes the puncture of major insulation.If can just can 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 measuring shelf depreciation is a lot, and for example method of difference, direction coupled method, electromagnetic coupled method, ultrahigh frequency inductive coupling method etc. are when adopting method of difference to measure, high-frequency signal is quite serious at the cable propagation attenuation, so that reduce detection sensitivity, the test duration is long, and limitation is arranged on the method for testing.When adopting the direction coupled method to measure, sensor be implanted on the cable insulation, be destroyed the metal water-tight of outside, use fewer.When adopting the electromagnetic coupled method to measure, attenuation ratio is more serious during the high-frequency signal transmission, needs to measure near cable splice as far as possible, otherwise influences sensitivity.When adopting the ultrahigh frequency coupled method to measure, ultra-high frequency signal attenuation ratio low frequency is much serious, so on-line monitoring need be installed a plurality of sensors and locate near cable splice or end as far as possible.In addition, also destroy the cable top layer.When adopting ultrasonic Detection Method to measure, sensitivity is low.The test of electromagnetic coupled method repeatability better, have simultaneously small and exquisite flexibly, handling safety, antijamming capability be strong, can reflect advantage such as pulse waveform more really, studied widely and used.
When the high-voltage cross-linking polythene cable circuit is longer, usually adopt the cross interconnected ground connection of protective metal shell, this method is that cable line is divided into some big section, every big section is divided into three segments of equal in length in principle, install isolating joint between every segment, the insulating barrier both sides of every cover isolating joint are adopted the scissors crossing method to replace to connect out of phase protective metal shell namely cross interconnected with coaxial cross interconnected line.Because the threephase cable intermediate head interconnects 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 problem of disturbing has mutually appearred in the local discharge signal of cable, makes the detection of this kind system shelf depreciation become complicated unusually.At present, domestic still do not have an effective detection method.
The Partial Discharge Sources of XLPE power cable insulation inside can be regarded as a some pulse signal source, when the inner generation of insulation shelf depreciation, the high-frequency electromagnetic pulse that produces of discharge along the outer armor of cable conductor and cable simultaneously to different direction propagation, in communication process, decay appears in high-frequency electromagnetic pulse meeting.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of localization method of cross interconnected cable intermediate joint shelf depreciation is provided, based on the electromagnetic coupled technology, adopt the amplitude phase place of DPAP(diverse location) pairing comparision, office's discharge signal that can solve the cross interconnected line of cable is disturbed problem mutually, its detection accuracy height, safe and reliable.
The technical solution used in the present invention is as follows:
A kind of cross interconnected cable intermediate joint partial discharge positioning method comprises the steps:
Step (1) is installed jaw type HFCT at the cross interconnected line of diverse location, detects discharge pulse current signal on the cross interconnected line by jaw type HFCT;
Step (2) is delivered to oscillograph with the discharge pulse current signal after jaw type HFCT institute measuring electric pulse current signal is handled;
Step (3) adopts the DPAP method, and amplitude, the phase place of diverse location institute measuring electric signal compared, and the result is carried out logic analysis, then discharge source is positioned.
Described jaw type HFCT is in the nature the Rogowski coil, utilizes electromagnetic induction principle that shelf depreciation is detected.
Described jaw type HFCT has directivity, and when mounted, its direction of arrow is all pointed to cross interconnected case.
The cross interconnected line of the described diverse location of step (1) refers to that cable intermediate joint is the IJ type, this type of intermediate head contains the two ends metallic shield is connected the insulating washer that cuts off, therefore, for the 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, and extension line B1 links to each other with extension line C2, extension line C1 and extension line A2 are 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, by the discharge pulse current signal in the jaw type HFCT detection metallic shield extension line.
The detailed process of described step (2) is as follows: describedly jaw type HFCT institute measuring electric pulse current signal is carried out filtering handle, reject 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: the discharge pulse current signal is carried out time-domain analysis, utilize DPAP method relatively waveform, amplitude and the phase relation of 6 discharge pulse current signals; 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 that concrete comparative approach is as follows:
The detailed process of described step (3) is as follows: the discharge pulse current signal is carried out time-domain analysis, utilize DPAP method relatively waveform, amplitude and the phase relation of 6 discharge pulse current signals; 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 that concrete comparative approach is as follows:
If satisfy 1 signal a1 and signal a2 homophase, amplitude equates; 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; When 5 signal a1, signal a2, signal c1, these 5 conditions of signal b2 waveform unanimity, judge that there is shelf depreciation in the intermediate head of A phase;
If satisfy 1 signal b1 and signal b2 homophase, amplitude equates; 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; When 5 signal b1, signal b2, signal a1, these 5 conditions of signal c2 waveform unanimity, judge that there is shelf depreciation in the intermediate head of B phase;
If satisfy 1 signal c1 and signal c2 homophase, amplitude equates; 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; When 5 signal c1, signal c2, signal b1, these 5 conditions of signal a2 waveform unanimity, judge that there is shelf depreciation in the intermediate head of C phase;
If all there are 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, during consistent these 5 conditions of signal a2 and signal c1 waveform, judge A mutually with B mutually intermediate head have shelf depreciation;
If all there are 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, during consistent these 5 conditions of signal a1 and signal b2 waveform, judge A mutually with C mutually intermediate head have shelf depreciation;
If all there are 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, during consistent these 5 conditions of signal c1 and signal a2 waveform, judge B mutually with C mutually intermediate head have shelf depreciation;
If all there are 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; During irregular these 5 conditions of 5 signal b2 and signal a1, signal c1 and the contrast of signal a2 amplitude, judge A phase, B mutually and C mutually intermediate head all have shelf depreciation.
The Chinese of described HFCT is High Frequency Current Sensor.
Beneficial effect of the present invention:
When adopting the high-frequency current method that cross interconnected cable intermediate joint is carried out Partial Discharge Detection, if there is shelf depreciation in certain phase intermediate head, its discharge pulse can conduct to other phases along cross interconnected line, Partial Discharge Detection to other phases produces serious the interference, be difficult to local point of discharge is accurately located, the present invention is based on the attenuation principle of high-frequency discharge pulsed current signal, gather the discharge current signal by the cross interconnected line at diverse location, utilize DPAP method relatively amplitude and the phase place of diverse location signal, can simply position shelf depreciation in the intermediate head fast, successfully solve discharge pulse interference problem in the cross interconnected line, improve the accuracy of cross interconnected cable intermediate joint shelf depreciation location.The used checkout equipment of the present invention has ubiquity, and is simple to operate, and detection method provided by the present invention is easy-to-understand, and is convenient and swift, is convenient to the technician and grasps, and is easy to promote.
Description of drawings
Fig. 1. the six roots of sensation metallic shield extension line synoptic diagram of three-phase intermediate head.
The interconnected sequential schematic of Fig. 2 six roots of sensation extension line.
1 insulating washer among the 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
The invention will be further described below in conjunction with specific embodiment:
A kind of cross interconnected cable intermediate joint partial discharge positioning method comprises the steps:
Step (1) is installed jaw type HFCT at the cross interconnected line of diverse location, detects current signal on the cross interconnected line by jaw type HFCT;
Step (2) is delivered to oscillograph with the discharge pulse current signal after jaw type HFCT institute measuring electric pulse current signal is handled;
Step (3) adopts the DPAP method, and amplitude, the phase place of diverse location institute measuring electric signal compared, and the result is carried out logic analysis, then discharge source is positioned.
Jaw type HFCT is in the nature the Rogowski coil, utilizes electromagnetic induction principle that shelf depreciation is detected.
Jaw type HFCT has directivity, and when mounted, its direction of arrow is all pointed to cross interconnected case.
The cross interconnected line of described diverse location refers to, cable intermediate joint is the IJ type, this type of intermediate head contains the two ends metallic shield is connected the insulating washer 1 that cuts off, therefore, for the 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, and extension line B1 links to each other with extension line C2, and extension line C1 and extension line A2 are interconnected.
Cross interconnected cable intermediate joint partial discharge positioning 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 at first respectively, by the discharge pulse current signal in the jaw type HFCT detection metallic shield extension line, reach oscillograph by concentric cable, the discharge pulse current signal is carried out time-domain analysis, utilize DPAP method relatively waveform, amplitude and the phase relation of 6 discharge pulse current signals; 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 that concrete comparative approach is as follows:
The detailed process of described step (3) is as follows: the discharge pulse current signal is carried out time-domain analysis, utilize DPAP method relatively waveform, amplitude and the phase relation of 6 discharge pulse current signals; And discharge pulse current signal (b2) expression of discharge pulse current signal (a2) expression of the expression of the discharge pulse current signal (a1) of extension line (A1), extension line (A2), discharge pulse current signal (b1) expression of extension line (B1), extension line (B2), discharge pulse current signal (c1) expression of extension line (C1), extension line (C2) discharge pulse current signal (c2) expression, concrete comparative approach is as follows:
If satisfy (1) signal a1 and signal a2 homophase, amplitude equates; (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; (5) during consistent these 5 conditions of signal a1, signal a2, signal c1, signal b2 waveform, judge that there is shelf depreciation in the intermediate head of A phase;
If satisfy (1) signal b1 and signal b2 homophase, amplitude equates; (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; (5) during consistent these 5 conditions of signal b1, signal b2, signal a1, signal c2 waveform, judge that there is shelf depreciation in the intermediate head of B phase;
If satisfy (1) signal c1 and signal c2 homophase, amplitude equates; (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; (5) during consistent these 5 conditions of signal c1, signal c2, signal b1, signal a2 waveform, judge that there is shelf depreciation in the intermediate head of C phase;
If all there are 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) during consistent these 5 conditions of signal b1, signal a2 consistent with signal c2 waveform and signal c1 waveform, judge A mutually with B mutually intermediate head have shelf depreciation;
If all there are 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) during consistent these 5 conditions of signal b1, signal a1 consistent with signal c2 waveform and signal b2 waveform, judge A mutually with C mutually intermediate head have shelf depreciation;
If all there are 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) during consistent these 5 conditions of signal b2, signal c1 consistent with signal a1 waveform and signal a2 waveform, judge B mutually with C mutually intermediate head have shelf depreciation;
If all there are 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; (5) during irregular these 5 conditions of signal b2 and signal a1, signal c1 and signal a2 amplitude contrast, judge A phase, B mutually and C mutually intermediate head all have shelf depreciation.
The present invention can position the intermediate head that has shelf depreciation simply fast by the contrast of above-mentioned discharge pulse amplitude, phase place, waveform, and the signal that has solved cross interconnected line is disturbed problem mutually.
Claims (5)
1. the localization method of a cross interconnected cable intermediate joint shelf depreciation is characterized in that, comprises the steps:
Step (1) is installed jaw type HFCT at the cross interconnected line of diverse location, detects discharge pulse current signal on the cross interconnected line by jaw type HFCT;
Step (2) is delivered to oscillograph with the discharge pulse current signal after jaw type HFCT institute measuring electric pulse current signal is handled;
Step (3) adopts the DPAP method, and amplitude, the phase place of the discharge pulse current signal that diverse location is surveyed compare, and the result is carried out logic analysis, then discharge source are positioned.
2. the localization method of a kind of cross interconnected cable intermediate joint shelf depreciation according to claim 1, it is characterized in that: described jaw type HFCT is in the nature the Rogowski coil, utilize electromagnetic induction principle that shelf depreciation is detected, and jaw type HFCT has directivity, when mounted, its direction of arrow is all pointed to cross interconnected case.
3. the localization method of a kind of cross interconnected cable intermediate joint shelf depreciation according to claim 1, it is characterized in that: the cross interconnected line of the described diverse location of step (1) refers to that cable intermediate joint is the IJ type, this type of intermediate head contains the two ends metallic shield is connected the insulating washer that cuts off, therefore, for the 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) is interconnected with extension line (B2), extension line (B1) links to each other with extension line (C2), extension line (C1) is interconnected with extension line (A2), during use, respectively at extension line (A1), extension line (A2), extension line (B1), extension line (B2), extension line (C1), extension line (C2) locates to place jaw type HFCT, by the discharge pulse current signal in the jaw type HFCT detection metallic shield extension line.
4. the localization method of a kind of cross interconnected cable intermediate joint shelf depreciation according to claim 4, it is characterized in that: the detailed process of described step (2) is as follows: describedly jaw type HFCT institute measuring electric pulse current signal is carried out filtering handle, reject noise signal, institute's measuring electric pulse current signal is reached oscillograph by concentric cable.
5. the localization method of a kind of cross interconnected cable intermediate joint shelf depreciation according to claim 3, it is characterized in that: the detailed process of described step (3) is as follows: the discharge pulse current signal is carried out time-domain analysis, utilize DPAP method relatively waveform, amplitude and the phase relation of 6 discharge pulse current signals; And discharge pulse current signal (b2) expression of discharge pulse current signal (a2) expression of the expression of the discharge pulse current signal (a1) of extension line (A1), extension line (A2), discharge pulse current signal (b1) expression of extension line (B1), extension line (B2), discharge pulse current signal (c1) expression of extension line (C1), extension line (C2) discharge pulse current signal (c2) expression, concrete comparative approach is as follows:
If satisfy 1, signal (a1) and signal (a2) homophase, amplitude equates; 2, signal (a1) is anti-phase with signal (b2), and signal (a1) amplitude is greater than signal (b2); 3, signal (a2) is anti-phase with signal (c1), and signal (a2) amplitude is greater than signal (c1); 4, extension line (B1) and extension line (C2) no pulse; 5, during consistent these 5 conditions of signal (a1), signal (a2), signal (c1), signal (b2) waveform, judge that there is shelf depreciation in the intermediate head of A phase;
If satisfy 1, signal (b1) and signal (b2) homophase, amplitude equates; 2, signal (b1) is anti-phase with signal (c2), and signal (b1) amplitude is greater than signal (c2); 3, signal (b2) is anti-phase with signal (a1), and signal (b2) amplitude is greater than signal (a1); 4, extension line (C1) and extension line (A2) no pulse; 5, during consistent these 5 conditions of signal (b1), signal (b2), signal (a1), signal (c2) waveform, judge that there is shelf depreciation in the intermediate head of B phase;
If satisfy 1, signal (c1) and signal (c2) homophase, amplitude equates; 2, signal (c1) is anti-phase with signal (a2), and signal (c1) amplitude is greater than signal (a2); 3, signal (c2) is anti-phase with signal (b1), and signal (c2) amplitude is greater than signal (b1); 4, extension line (A1) and extension line (B2) no pulse; 5, during consistent these 5 conditions of signal (c1), signal (c2), signal (b1), signal (a2) waveform, judge that there is shelf depreciation in the intermediate head of C phase;
If satisfy 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) is anti-phase with signal (b2); 3, signal (a2) is anti-phase with signal (c1), and signal (a2) amplitude is greater than signal (c1); 4, signal (b1) is anti-phase with signal (c2), and signal (b1) amplitude is greater than signal (c2); 5, signal (b1), signal (a2) consistent with signal (c2) waveform be with signal (c1) waveform during consistent these 5 conditions, judge A mutually with B mutually intermediate head have shelf depreciation;
If satisfy 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) is anti-phase with signal (c1); 3, signal (a1) is anti-phase with signal (b2), and signal (a1) amplitude is greater than signal (b2); 4, signal (c2) is anti-phase with signal (b1), and signal (c2) amplitude is greater than signal (b1); 5, signal (b1), signal (a1) consistent with signal (c2) waveform be with signal (b2) waveform during consistent these 5 conditions, judge A mutually with C mutually intermediate head have shelf depreciation;
If satisfy 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) is anti-phase with signal (c2); 3, signal (b2) is anti-phase with signal (a1), and signal (b2) amplitude is greater than signal (a1); 4, signal (c1) is anti-phase with signal (a2), and signal (c1) amplitude is greater than signal (a2); 5, signal (b2), signal (c1) consistent with signal (a1) waveform be with signal (a2) waveform during consistent these 5 conditions, judge B mutually with C mutually intermediate head have shelf depreciation;
If satisfy 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) is anti-phase with signal (b2); 3, signal (b1) is anti-phase with signal (c2); 4, signal (c1) is anti-phase with signal (a2); 5, during irregular these 5 conditions of signal b2 and signal a1, signal c1 and signal a2 amplitude contrast, judge A phase, B mutually and C mutually intermediate head all have shelf depreciation.
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| CN103954894A (en) * | 2014-05-12 | 2014-07-30 | 国家电网公司 | Partial discharge locating method for three-phase crossed and interconnected cables |
| CN103983853A (en) * | 2014-05-09 | 2014-08-13 | 国家电网公司 | Phase position check method of high voltage cable frogging interconnected system |
| CN106872860A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | Phase method is sentenced in a kind of cable run local discharge signal identification |
| 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 |
| CN110658429A (en) * | 2019-11-03 | 2020-01-07 | 西南交通大学 | Method for estimating length of electric branch in crosslinked polyethylene cable insulation of power distribution network |
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| CN103983853A (en) * | 2014-05-09 | 2014-08-13 | 国家电网公司 | Phase position check method of high voltage cable frogging interconnected system |
| CN103954894A (en) * | 2014-05-12 | 2014-07-30 | 国家电网公司 | Partial discharge locating method for three-phase crossed and interconnected cables |
| CN106872860A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | Phase method is sentenced in a kind of cable run local discharge signal identification |
| 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 |
| CN110658429A (en) * | 2019-11-03 | 2020-01-07 | 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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