CN202994722U - Flexibility magnetostriction and eddy integrated sensor for high-voltage transmission line defect detecting - Google Patents
Flexibility magnetostriction and eddy integrated sensor for high-voltage transmission line defect detecting Download PDFInfo
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- CN202994722U CN202994722U CN 201220451281 CN201220451281U CN202994722U CN 202994722 U CN202994722 U CN 202994722U CN 201220451281 CN201220451281 CN 201220451281 CN 201220451281 U CN201220451281 U CN 201220451281U CN 202994722 U CN202994722 U CN 202994722U
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Abstract
The utility model relates to a flexibility magnetostriction and eddy integrated sensor for high-voltage transmission line defect detecting, and belongs to the technical field of electromagnetism acoustic sensors. A flexible printing coil for an outer layer magnetostriction sensor and a flexible printing coil for an inner layer eddy sensor are printed on a base plate. The flexible printing coils can be curled to be in a column shape and be tightly attached on the surface of a high-voltage transmission line to form a solenoid coil. The flexible printing coils are fixedly clamped through connectors and then are arranged on a tested transmission line to carry out defect detecting. After the fixed-clamping state is removed, the flexible printing coils can be disassembled from the transmission line. The integrated sensor can carry out full-structure defect detecting on the transmission line by simulating longitudinal modal ultrasonic guided wave in the transmission line based on magnetostriction effect and achieves axial locating of defect. The integrated sensor can also detect complex impedance changing of a sensor detecting coil caused by the defects of the transmission line with a multi-channel eddy sensor based on eddy effect and achieves periphery locating of the defect. Meanwhile, based on the skin effect of an eddy field, the depth position of the defect in the transmission line can be determined.
Description
Technical field:
The high voltage transmission line defects detection belongs to the electromagnetic acoustic sensor technical field with flexible magnetostriction and eddy current integrated transducer.
Background technology:
Generally, high voltage transmission line is to be formed around its center core spiral twisting by one or more layers single line, the twisting opposite direction of adjacent layer.Different according to material, single line mainly comprises aluminium and aluminium alloy wire, and the center core mainly comprises galvanized steel wire and aluminum-clad steel wire.The health status of high voltage transmission line directly affects security of operation and the economic benefit of electric power networks.The sensor of simple function all can only detect power transmission line steel core or aluminum stranded conductor defective at present, detects when can't realize bi-material.And there are the limitation such as inconvenience is installed in the reasons such as complicated and volume, quality be larger due to sensor construction in reality detects.Therefore, need development structure succinct, can realize that the full structure of power transmission line falls into detection, the novel sensor of easy disassembly.
The utility model content:
The utility model purpose is to realize the unification of structure and the function of flexible magneto strictive sensor and eddy current sensor, utilize integrated transducer to carry out defects detection to power transmission line internal layer steel core and outer aluminum stranded conductor, simultaneously, this integrated transducer can be easily installed in the transmission line structure surface and remove from it.
For achieving the above object, the utility model is taked following technical scheme:
The high voltage transmission line defects detection comprises biasing magnetic circuit 3, outer flexible printing coil 4, internal layer flexible printing coil 5, substrate 9 and connector 6 with flexible magnetostriction and eddy current integrated transducer.Outer flexible printing coil 4, internal layer flexible printing coil 5 are printed in respectively the outside and the inboard of substrate 9; Internal layer flexible printing coil 5 can curlingly be close to the outer aluminum stranded conductor of power transmission line 1 surface, and the two ends of substrate 9 fasten by connector 6 and are installed on the outer aluminum stranded conductor 1 of power transmission line after fixing.Outer flexible printing coil 4 is used for magneto strictive sensor, can realize the axial location to defective in wire; Internal layer flexible printing coil 5 is used for the multichannel swirl sensor, can realize the circumferential and depth localization of wire defective.That the flexible printing coil has is thin, light and flexibility can be curling etc. physical characteristics, simultaneously, the design of connector 6 makes integrated transducer be convenient to installation and removal, thus, integrated transducer more is applicable to the actual detection of engineering.
What outer flexible printing coil 4 was interior is provided with m group copper cash along the power transmission line length direction, after connector 6 fixes, form the circumferential formation solenoid coil along power transmission line, wherein two adjacent groups coil positive and negative alternate coiling, be used for the inductive coil of magneto strictive sensor, m is the integer less than or equal to 16; Internal layer flexible printing coil 5 is provided with the two spiral yarn shaped coils of row along the length direction of power transmission line, the number of the spiral yarn shaped coil of each row is n, after connector 6 fixes, n spiral yarn shaped coil in each row circumferentially is evenly arranged along power transmission line, and the position of the two spiral yarn shaped coils of row on the circumferential direction on power transmission line is identical.M represents outer flexible printing coil 4 coil group numbers, and n represents the internal layer flexible printing coil 5 broad ways number of every alignment circle in two alignment circles side by side, and n is less than 32 even number greater than 2.
The winding direction of the spiral yarn shaped coil in described internal layer flexible printing coil 5 is identical, at starting point and the terminal point of each spiral yarn shaped coil, the connectivity port is set, and is provided with altogether 4n connectivity port.
Biasing magnetic circuit 3 comprises bar shaped yoke, permanent magnet and saddle sheet etc., is positioned over outer flexible printing coil 4 and internal layer flexible printing coil 5 two ends, power transmission line internal layer steel core is magnetized, to form closed magnetic circuit.
After being installed on power transmission line, by the connected mode of 4n connectivity port of 2n spiral yarn shaped coil in internal layer flexible printing coil 5 is set, can form hyperchannel absolute type or differential type eddy current sensor.
Principle of work of the present utility model is as follows:
When working in the magneto strictive sensor function, motivate the longitudinal mode supersonic guide-wave in wire, power transmission line is carried out full fault of construction detect, realize the axial location to defective; When working in the multichannel swirl sensor function, each channel sensor impedance variation of contrast circumferencial direction realizes the circumferential location to defective.Simultaneously, by the frequency conversion detection method, adjust eddy current sensor and detect the degree of depth, detect and draw the depth location of defective in power transmission line.This integrated transducer set the common structure of magnetostriction and eddy current sensor, can realize the full fault of construction of the outer aluminum stranded conductor of power transmission line and internal layer steel core is detected, defective is carried out three-dimensional localization, it has the physical property that flexibility can be curling simultaneously, structure is light, be easy to dismounting, the Practical Project that is applicable to high voltage transmission line detects.
The utility model can obtain following beneficial effect:
The utility model adopts above technical scheme, makes integrated transducer both can work in magneto strictive sensor, can work in the multichannel swirl sensor again, and structure is light, is easy to dismounting.Utilize this integrated transducer both can realize the defects detection of power transmission line internal layer steel core and outer aluminum stranded conductor, can determine the three-dimensional position of defective again.
Description of drawings:
Fig. 1 integrated transducer integral installation schematic diagram;
The outer flexible printing coil of Fig. 24 schematic diagram;
Fig. 3 internal layer flexible printing coil 5 schematic diagram;
Fig. 4 port number is the absolute type eddy current sensor port connection mode of n;
Fig. 5 port number is the differential type eddy current sensor port connection mode of n;
The guided wave defect detection signal that Fig. 6 integrated transducer receives;
The different passages of Fig. 7 multichannel swirl sensor receive defectiveness place impedance measurements;
The different passages of Fig. 8 multichannel swirl sensor receive zero defect place impedance measurements.
In figure: the outer aluminum stranded conductor of 1-power transmission line, 2-power transmission line internal layer steel core, the 3-magnetic circuit of setover, 4-skin flexible printing coil, 5-internal layer flexible printing coil, 6-connector, 7-BNC joint, 8-copper cash, 9-substrate.
Embodiment:
The high voltage transmission line defects detection with flexible magnetostriction and eddy current integrated transducer by biasing magnetic circuit 3, outer flexible printing coil 4(Fig. 2), internal layer flexible printing coil 5(Fig. 3) and connector 6 etc. partly form.Measurand is high voltage transmission line, comprises the outer aluminum stranded conductor 1 of power transmission line and power transmission line internal layer steel core 2.The flexible printing coil partly is comprised of copper cash 8 and substrate 9 etc., and the coupling part of flexible printing coil comprises connector 6 and BNC connector 7 etc.Double-layer flexible printed coil length is greater than the girth of tested power transmission line, is fastened in the power transmission line surface by connector 6 after curling, and scheme of installation as shown in Figure 1.This integrated flexible sensor is applicable to the defects detection to the steel-cored aluminium strand (as the single or multiple lift steel-cored aluminium strand) of different structure and size.
When integrated transducer works in the magneto strictive sensor function, outer flexible printing coil 4 is after connector connects, in the m group inductive coil that it comprises, the two adjacent groups coil adopts the coiling of positive and negative alternate mode, can realize the control to its centre frequency, the related content that designs about the magneto strictive sensor centre frequency in " cable wire stress and defects detection with flexible magnetostriction and magnetic bullet integrated transducer " that concrete principle is announced with reference to number of patent application 201110303573.8.Biasing magnetic circuit 3 provides quiescent biasing magnetic field so that power transmission line internal layer steel core 2 is magnetized.Pass into the exchange current of certain frequency in outer flexible printing coil 4, produce alternating magnetic field in power transmission line internal layer steel core 2.When quiescent biasing magnetic field and alternating magnetic field were all axial along power transmission line, two magnetic field interactions can motivate the longitudinal mode supersonic guide-wave in power transmission line internal layer steel core, along the power transmission line Propagation.Outer flexible printing coil 4 both can be used as drive coil, motivated the longitudinal mode supersonic guide-wave in power transmission line internal layer steel core 2; Also can be used as receiving coil, receive the reflection echo that in power transmission line, Discontinuous Interface place (as defective, end etc.) produces, export Acquisition Circuit to voltage signal.By the analysis to the damage position reflection echo signal, time T according to flaw echo in time domain waveform, the propagation velocity of wave V of longitudinal mode guided wave signals in power transmission line, by formula S=(VT)/2, can be calculated defective and sensor apart from S, and then realize the axial location of defective in power transmission line.Fig. 6 be the integrated flexible working sensor when the magneto strictive sensor function, the echoed signal that after excitation longitudinal mode supersonic guide-wave, sensor receives is comprising flaw echo and end face echoed signal.
After defective is carried out axial location, the multichannel swirl sensor is moved to the axial positions at defective place, it is carried out circumferentially and depth detection.The multichannel swirl sensor comprises absolute type and two kinds of forms of sensor of differential type.Absolute type n Passage Vortex flow sensor excitation receiving port connection mode as shown in Figure 4, p represents internal layer flexible printing coil 5 an alignment circle number wherein in two alignment circles side by side, q represents internal layer flexible printing coil 5 another alignment circle number in two alignment circles side by side.Internal layer flexible printing coil 5 Widths are in two spiral yarn shaped coils of same row, the input port 2q-1(p=q=n of coil output mouth 2p and another coil) be connected.Differential type n Passage Vortex flow sensor excitation receiving port connection mode as shown in Figure 5, along internal layer flexible printing coil 5 Widths, be in two spiral yarn shaped coils of same row, the output port 2q(p=q=n of coil output mouth 2p and another coil) be connected.Each passage in the multichannel swirl sensor can average corresponding circumferencial direction certain limit peripheral aluminum stranded conductor, when pass into the exchange current of certain frequency in internal layer flexible printing coil 5, produce the vortex field due to electromagnetic induction in power transmission line.Defective can cause the conductivity of power transmission line and physical dimension etc. to change, and causes the distortion of vortex field, and then the impedance that causes covering in eddy current sensor the passage coil of defective place circumferential zones changes, and other passage coil impedances do not change.Thus, by the impedance measurements of comparison multichannel swirl sensor magnetic test coil, can determine the circumferential position of defective.Fig. 7 is the integrated flexible working sensor defectiveness place that different passages receive when the multichannel swirl sensor and the contrast of healthy wire impedance measurements; Fig. 8 is zero defect place and the contrast of healthy wire impedance measurements that the different passages of multichannel swirl sensor receive.
Defective carries out continuing to utilize the multichannel swirl sensor to carry out depth localization to defective on basis, axial and circumferential location in to power transmission line.When EDDY CURRENT Plays depth of penetration δ refers to that vortex density decays to face value 1/e, eddy current penetrates the degree of depth of conductor.That is:
F in formula-exchange current frequency, the Hz of unit;
μ-permeability, the H/m of unit;
σ-material electric conductivity, the S/m of unit.
As shown from the above formula, when selecting different detection frequency, the detection degree of depth of eddy current sensor is different.Utilize the multichannel swirl sensor, select the corresponding single channel coil of defective, implement frequency conversion and detect, adjust the detection degree of depth of coil, according under the different frequency condition to the detection signal of defective, judge the depth location of defective.
By the magnetostriction of integrated flexible sensor and the function combination of eddy current sensor, both can realize the full structure to high voltage transmission line, it is the defects detection of outer aluminum stranded conductor and internal layer steel core, can realize again to defective in power transmission line axially, circumferentially and the location of the degree of depth, namely realize the three-dimensional localization to defective.
Claims (2)
1. the high voltage transmission line defects detection with flexible magnetostriction and eddy current integrated transducer, is characterized in that: comprise biasing magnetic circuit (3), outer flexible printing coil (4), internal layer flexible printing coil (5), substrate (9) and connector (6); Outer flexible printing coil (4), internal layer flexible printing coil (5) are printed in respectively the outside and the inboard of substrate (9); Internal layer flexible printing coil (5) can curlingly be close to the outer aluminum stranded conductor (1) of power transmission line surface, and the two ends of substrate (9) fasten by connector (6) and are installed on power transmission line skin aluminum stranded conductor (1) after fixing;
What outer flexible printing coil (4) was interior is provided with m group copper cash along the power transmission line length direction, after connector (6) fixes, formation is along the circumferential formation solenoid coil of power transmission line, and wherein two adjacent groups coil positive and negative alternate coiling is for the inductive coil of magneto strictive sensor; Internal layer flexible printing coil (5) is provided with the two spiral yarn shaped coils of row along the length direction of power transmission line, the number of the spiral yarn shaped coil of each row is n, after connector (6) fixes, n spiral yarn shaped coil in each row circumferentially is evenly arranged along power transmission line, and the position of the two spiral yarn shaped coils of row on the circumferential direction on power transmission line is identical; M represents outer flexible printing coil (4) coil group number, and n represents internal layer flexible printing coil (5) the broad ways number of every alignment circle in two alignment circles side by side;
The winding direction of the spiral yarn shaped coil in described internal layer flexible printing coil (5) is identical, at starting point and the terminal point of each spiral yarn shaped coil, the connectivity port is set, and is provided with altogether 4n connectivity port;
Biasing magnetic circuit (3) comprises bar shaped yoke, permanent magnet and saddle sheet etc., is positioned over outer flexible printing coil (4) and internal layer flexible printing coil (5) two ends, power transmission line internal layer steel core is magnetized, with the formation closed magnetic circuit.
2. high voltage transmission line defects detection according to claim 1 with flexible magnetostriction and eddy current integrated transducer, is characterized in that: m is for less than or equal to 16 integer, and n is less than 32 even number greater than 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220451281 CN202994722U (en) | 2012-09-05 | 2012-09-05 | Flexibility magnetostriction and eddy integrated sensor for high-voltage transmission line defect detecting |
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| CN 201220451281 CN202994722U (en) | 2012-09-05 | 2012-09-05 | Flexibility magnetostriction and eddy integrated sensor for high-voltage transmission line defect detecting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841132A (en) * | 2012-09-05 | 2012-12-26 | 北京工业大学 | Flexible magnetostriction and eddy integrated sensor for detecting defects of high-voltage transmission line |
| CN104597083A (en) * | 2015-01-13 | 2015-05-06 | 大连理工大学 | Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method |
| CN107192759A (en) * | 2017-06-09 | 2017-09-22 | 湖南大学 | A kind of photovoltaic cell lossless detection method and system based on sensing optical heat radiation |
| RU2651618C1 (en) * | 2017-04-03 | 2018-04-23 | Общество с ограниченной ответственностью "АльфаСервис" | Method of eddy current control of extended electrical conductive objects and device for its implementation |
-
2012
- 2012-09-05 CN CN 201220451281 patent/CN202994722U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102841132A (en) * | 2012-09-05 | 2012-12-26 | 北京工业大学 | Flexible magnetostriction and eddy integrated sensor for detecting defects of high-voltage transmission line |
| CN102841132B (en) * | 2012-09-05 | 2015-04-29 | 北京工业大学 | Flexible magnetostriction and eddy integrated sensor for detecting defects of high-voltage transmission line |
| CN104597083A (en) * | 2015-01-13 | 2015-05-06 | 大连理工大学 | Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method |
| CN104597083B (en) * | 2015-01-13 | 2017-01-18 | 大连理工大学 | Ultrasonic guided wave and electromechanical impedance-based mobile damage detection method |
| RU2651618C1 (en) * | 2017-04-03 | 2018-04-23 | Общество с ограниченной ответственностью "АльфаСервис" | Method of eddy current control of extended electrical conductive objects and device for its implementation |
| CN107192759A (en) * | 2017-06-09 | 2017-09-22 | 湖南大学 | A kind of photovoltaic cell lossless detection method and system based on sensing optical heat radiation |
| CN107192759B (en) * | 2017-06-09 | 2019-08-27 | 湖南大学 | A kind of photovoltaic cell lossless detection method and system based on induction optical heat radiation |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130612 Effective date of abandoning: 20150429 |