CN103399259A - Input signal identification method based on single-end suspension simulation model - Google Patents
Input signal identification method based on single-end suspension simulation model Download PDFInfo
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Abstract
The invention relates to an input signal identification method based on a single-end suspension simulation model. The single end suspension simulation model comprises multiple sections of cable bodies which are sequentially connected in series, wherein a coaxial cable is connected in series between every two sections of cable bodies; an earth box is connected onto the first section of cable body, and an earth box is connected onto the last section of cable body; transposition boxes are connected in parallel with the two ends of each coaxial cable except the coaxial cable with defects; a first voltage meter and a second voltage meter are arranged at the two ends of the coaxial cable with the defects. The input signal identification method comprises the following steps: 1, driving signals are added at the input end of the single-end suspension simulation model; 2, a controller reads induced voltage data of the first voltage meter and the second voltage meter respectively, and the average induced voltage data is obtained through calculation; 3, the controller judges the types of the input signals according to the average induced voltage data. Compared with the prior art, the input signal identification method has the advantages that site detection efficiency and detection precision and the like are efficiently improved.
Description
Technical field
The present invention relates to a kind of cables simulation technology, especially relate to a kind of recognition methods of input signal based on single-ended suspension realistic model.
Background technology
The mode that the District of Shanghai high-tension cable mainly takes comb to lay, middle transposition case and grounding box all adopt the fiberglass double door console mode of Uniting, mostly are arranged on work well neighbouring walkway, greenery patches.Adopt transposition case, the grounding box of ground vertical, the convenient advantage of installing, moving, overhauling and detect is arranged, but also easily destroyed simultaneously.Shanghai Power Network 110kV and above cable sheath earthed system defect main Types are divided into: the municipal works transformation; Outside destroy; Steal; Operational defect.
Add up result such as following table 1 by the defect number of times that 110kV in 2009,2010 and above cable sheath earthed system are occurred:
Table 1
1) municipal works transformation: due to the composite demand of urban development, town road need to be reconstructed and widen, so the transposition case that is placed on road surface needs displacement.Need to cut-off concentric cable in the shift operation process, temporarily destroy the cable sheath earthed system.
2) outside destroy: outside destroy is mainly the car hit case, and illegal excavation and barbarous construction cause earthed system to damage.Outside destroy is a significant problem of cable sheath earthed system defect always, and the outside destroy number of times of 09,10 year remains basically stable, and maintains a high level.
3) steal: the annex because the cable sheath earthed system adopts, be copper product as concentric cable, transposition (ground connection) row etc., price is high.In these 2 years, steal phenomenon all occurs in the region, Songjiang, and area of living in is comparatively remote bleak and desolate, as SS1167/1169.Although it is larger that the pilferage situation accounts for the proportion of all defects count, and the earthed system damaged condition that pilferage causes is very serious, even also encounters three continuous shifting sections and all destroys, the operation of serious harm cable body.Earthed system after stealing is carried out the repair difficulty large, hot line job jeopardizes staff's life security, also lacks correlation experience and concrete rules, can only adopt power failure operation.
4) operational defect: the defect of finding in routine test, needs to change lower than setting such as the sheath protector insulation resistance; Perhaps stake resistance is excessive, reinstall ground connection etc.
Therefore how the input signal of cable system is identified effectively, thereby further determined the origin cause of formation that defect causes, thereby further improve overhaul efficiency and prevent that defect from occurring.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of recognition methods of input signal based on single-ended suspension realistic model for the defect that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of recognition methods of input signal based on single-ended suspension realistic model, described single-ended suspension realistic model comprises the cable body that multistage is connected successively, be serially connected with concentric cable between the adjacent segment cable body in twos, all be connected to grounding box on first paragraph cable body and final stage cable body, wherein all the other concentric cable two ends all are parallel with the transposition case except the concentric cable that has fault location, the described concentric cable two ends of fault location that exist are provided with the first voltage table and second voltage table, it is characterized in that, described input signal recognition methods comprises the following steps:
1) input end at single-ended suspension realistic model adds pumping signal;
2) controller reads respectively the induced voltage data of the first voltage table and second voltage table, calculates average induced voltage data;
3) controller judges the type of input signal according to average induced voltage data.
Described controller judges that according to the induced voltage data type of input signal is specially:
31) set first threshold if average induced voltage data surpass, judge that input signal is the lightning surge signal;
32) if average induced voltage data between Second Threshold and first threshold, judge that input signal is the switching overvoltage signal;
33) if average induced voltage data, lower than Second Threshold, judge that input signal is normal run signal.
If it is 800mm that cable adopts the 110kV cross section
2Cable, described first threshold is 230 to 280KV, described Second Threshold is 100 to 150KV.
Described first threshold is 250KV, and described Second Threshold is 130KV.
Compared with prior art, the present invention has the multiple electric cable stoppage of emulation, has set up the database of electric cable stoppage type and induced voltage, for Site Detection provides the data basis, thereby has effectively improved Site Detection efficiency and accuracy of detection.
Description of drawings
Fig. 1 is the present invention's one end suspension realistic model schematic diagram;
The first voltage table induced voltage curve map when Fig. 2 is the lightning surge signal;
Second voltage table induced voltage curve map when Fig. 3 is the lightning surge signal;
The first voltage table induced voltage curve map when Fig. 4 is the switching overvoltage signal;
Second voltage table induced voltage curve map when Fig. 5 is the switching overvoltage signal.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
A kind of recognition methods of input signal based on single-ended suspension realistic model, as shown in Figure 1, a described end suspension realistic model comprises the cable body 1 that multistage is connected successively, 1 of adjacent segment cable body is serially connected with concentric cable 2 in twos, all be connected to grounding box 4 on first paragraph cable body 1 and final stage cable body 1, wherein all the other concentric cable two ends all are parallel with transposition case 3 except the concentric cable that has fault location.The described concentric cable two ends of fault location that exist are provided with the first voltage table 5 and second voltage table 6.
Described input signal recognition methods comprises the following steps:
1) input end at single-ended suspension realistic model adds pumping signal;
2) controller reads respectively the induced voltage data of the first voltage table and second voltage table, calculates average induced voltage data;
3) controller judges the type of input signal according to average induced voltage data.
Described controller judges that according to the induced voltage data type of input signal is specially:
31) set first threshold if average induced voltage data surpass, judge that input signal is the lightning surge signal;
32) if average induced voltage data between Second Threshold and first threshold, judge that input signal is the switching overvoltage signal;
33) if average induced voltage data, lower than Second Threshold, judge that input signal is normal run signal.
If it is 800mm that cable adopts the 110kV cross section
2Cable, described first threshold is 250KV, described Second Threshold is 130KV.
One, normal run signal:
The first voltage table 5, second voltage table 6 measurement data are as shown in table 2.
Two, lightning surge signal
When lightning surge, the induction voltage waveform of the first voltage table and second voltage table as shown in Figures 2 and 3.
Draw from figure, the maximal value at the first voltage table place is: A (331.5kV), B (336.2kV), C (321.7kV); The maximal value at second voltage table place is: A (382.1kV), B (369.2kV), C (298.7kV).
Three, switching overvoltage signal
When switching overvoltage, the induction voltage waveform of the first voltage table and second voltage table as shown in Figures 4 and 5.
Can find out in figure, during switching overvoltage, the maximal value at the first voltage table place is: A (151.5kV), B (157.3kV), C (164.9kV); The maximal value at second voltage table place is: A (189.6kV), B (199.6kV), C (212.0kV).
Claims (4)
1. recognition methods of the input signal based on single-ended suspension realistic model, described single-ended suspension realistic model comprises the cable body that multistage is connected successively, be serially connected with concentric cable between the adjacent segment cable body in twos, all be connected to grounding box on first paragraph cable body and final stage cable body, wherein all the other concentric cable two ends all are parallel with the transposition case except the concentric cable that has fault location, the described concentric cable two ends of fault location that exist are provided with the first voltage table and second voltage table, it is characterized in that, described input signal recognition methods comprises the following steps:
1) input end at single-ended suspension realistic model adds pumping signal;
2) controller reads respectively the induced voltage data of the first voltage table and second voltage table, calculates average induced voltage data;
3) controller judges the type of input signal according to average induced voltage data.
2. a kind of recognition methods of input signal based on single-ended suspension realistic model according to claim 1, is characterized in that, described controller judges that according to the induced voltage data type of input signal is specially:
31) set first threshold if average induced voltage data surpass, judge that input signal is the lightning surge signal;
32) if average induced voltage data between Second Threshold and first threshold, judge that input signal is the switching overvoltage signal;
33) if average induced voltage data, lower than Second Threshold, judge that input signal is normal run signal.
3. a kind of recognition methods of input signal based on single-ended suspension realistic model according to claim 2, is characterized in that, if cable adopts the 110kV cross section, is 800mm
2Cable, described first threshold is 230 to 280KV, described Second Threshold is 100 to 150KV.
4. a kind of recognition methods of input signal based on single-ended suspension realistic model according to claim 32, is characterized in that, described first threshold is 250KV, and described Second Threshold is 130KV.
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| CN103076545A (en) * | 2012-12-31 | 2013-05-01 | 广州供电局有限公司 | Electrified length measurement and local discharge detection and positioning simulation system for high voltage cable |
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| CN201607479U (en) * | 2009-12-18 | 2010-10-13 | 广东电网公司电力科学研究院 | Over-voltage non-contact on-line monitoring and identifying integrated device for power grid |
| CN102735947A (en) * | 2012-06-05 | 2012-10-17 | 贵州电力试验研究院 | Power grid overvoltage identification method by adopting multi-parameter ratio codes |
| CN103076545A (en) * | 2012-12-31 | 2013-05-01 | 广州供电局有限公司 | Electrified length measurement and local discharge detection and positioning simulation system for high voltage cable |
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| 夏荣 等: "大截面长距离35kV单芯交联电缆金属护层感应电压与环流在线检测及抑制研究", 《PROCEEDINGS OF 2010 THE 3RD INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND INTELLIGENT TRANSPORTATION SYSTEM》, vol. 6, 20 November 2010 (2010-11-20) * |
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