CN112629721B - Interface pressure detection and monitoring device and method for high-voltage cable and accessories - Google Patents
Interface pressure detection and monitoring device and method for high-voltage cable and accessories Download PDFInfo
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- CN112629721B CN112629721B CN202011447677.1A CN202011447677A CN112629721B CN 112629721 B CN112629721 B CN 112629721B CN 202011447677 A CN202011447677 A CN 202011447677A CN 112629721 B CN112629721 B CN 112629721B
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 238000012806 monitoring device Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 53
- 238000012544 monitoring process Methods 0.000 claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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Abstract
The invention discloses an interface pressure detection and monitoring device and method for high-voltage cables and accessories, which comprises a wiring terminal, a grating sensor, an insulation assembly, a cable semi-conducting layer, an acquisition controller, a stress cone, a cable insulation layer, an injection port, a pressure gauge and a sealing cylinder body, wherein the wiring terminal is connected with the grating sensor; the wiring terminal is fixed on a cable core at the end part of the cable insulation layer, the grating sensor is annularly embedded and arranged on the cable insulation layer, a wire harness of the grating sensor is arranged along the cable insulation layer and the surface of a cable semi-conductive layer and led out to the acquisition controller, the injection pressure port and the pressure gauge are fixedly arranged on the sealing cylinder body, and the insulation assembly and the stress cone form an integrated mold forming structure; forming an interface pressure calibration unit and an interface pressure detection and monitoring unit. The detection and monitoring method is scientific and reasonable, has the remarkable technical advantages of high measurement precision, simple structural principle, strong universality, high reliability, good economical efficiency and outstanding practical value.
Description
Technical Field
The invention relates to a detection, monitoring and intelligentization technology of a high-voltage cable and accessories, in particular to an interface pressure detection and monitoring device and method for the high-voltage cable and accessories.
Background
The high-voltage cable assembly product is a main component of a high-voltage electric appliance on the network side of rail transit equipment and is a connecting element of a high-voltage component in a 25kV high-voltage main circuit.
The high-voltage cable assembly mainly comprises a high-voltage cable and accessories, wherein the accessories comprise a T-shaped connector, an outdoor terminal, an indoor terminal, an L-shaped connector and the like, the accessories are connected with the high-voltage cable mainly through two processes of a heat shrinkage type process and a prefabrication type process, and in order to guarantee sufficient insulation strength and capacity, an interface between the accessories and the high-voltage cable is required to have sufficient pressure.
The surface flashover discharge occurring on the interface between the high-voltage cable terminal and the cable is the most common high-voltage cable fault type, and the fault rate is obviously higher than that of the insulation layer body breakdown. Along with the increase of the application time and mileage of a high-voltage cable assembly product, the interface pressure of an accessory and a high-voltage cable is reduced, and creeping discharge faults are caused when the interface pressure is serious.
The prefabricated cable accessory gradually becomes a mainstream technical scheme, interface pressure is guaranteed through interference fit of a cable insulating layer and an accessory insulating layer, interference magnitude is mainly determined according to test and experience data, effective and accurate interface pressure monitoring means are also lacked, the real situation of circumferential interface pressure cannot be reflected by a common scheme of pasting a multi-point sheet pressure sensor on the surface of the cable insulating layer, and the sensor is easily damaged in the assembly process of a simulation product.
In summary, it is necessary to research an interface pressure detecting and monitoring device and method for high-voltage cables and accessories, so as to provide technical support for forward design of prefabricated cable accessories, develop intelligent high-voltage cable terminals and other accessories, recognize interface pressure reduction state in time, send out valuable early warning signals, and provide technical support for safe application of rolling stock.
Disclosure of Invention
The invention aims to provide a device and a method for detecting and monitoring the interface pressure of a high-voltage cable and accessories.
The purpose of the invention is realized by the following technical scheme:
the invention relates to an interface pressure detection and monitoring device for high-voltage cables and accessories, which comprises a wiring terminal, a grating sensor, an insulation assembly, a cable semi-conducting layer, an acquisition controller, a stress cone, a cable insulation layer, an injection port, a pressure gauge and a sealing cylinder body, wherein the wiring terminal is connected with the grating sensor;
the wiring terminal is fixed on a cable core at the end part of the cable insulation layer, the grating sensor is annularly arranged on the cable insulation layer, and a wiring harness of the grating sensor is distributed along the cable insulation layer and the surface of the cable semi-conductive layer and led out to the acquisition controller;
the injection port and the pressure gauge are fixedly arranged on the sealing cylinder body, and the insulating assembly and the stress cone are of an integrated mold forming structure;
the connecting terminal, the cable insulating layer, the grating sensor, the cable semi-conducting layer, the acquisition controller, the injection port, the pressure gauge and the sealing cylinder body jointly form an interface pressure calibration unit;
the wiring terminal, the cable insulating layer, the grating sensor, the cable semi-conducting layer, the acquisition controller, the insulating assembly and the stress cone jointly form an interface pressure detection and monitoring unit.
The method for detecting and monitoring the interface pressure of the high-voltage cable and the accessory by the interface pressure detecting and monitoring device for the high-voltage cable and the accessory is characterized in that the corresponding relation between the strain capacity of the grating sensor and the surface pressure of the cable insulation layer is established by the interface pressure calibration unit, the strain capacities of the grating sensor under different working conditions are extracted by the interface pressure detecting and monitoring unit, and the interface pressure of the high-voltage cable accessory is calculated according to the established corresponding relation.
According to the technical scheme provided by the invention, the interface pressure detection and monitoring device and method for the high-voltage cable and the accessory provided by the embodiment of the invention are scientific and reasonable, and have the remarkable technical advantage of high measurement precision by combining a calibration method for uniformly applying pressure and an analysis method for extracting the circumferential strain quantity of the cable insulating layer; the calibrating unit and the detecting and monitoring unit are simple in structure principle and strong in universality, are simultaneously suitable for detecting and monitoring the interface pressure of the thermal shrinkage type high-voltage cable accessory and the interface pressure of the prefabricated high-voltage cable accessory, are high in reliability, good in economical efficiency and outstanding in practical value, and have great significance for improving the research level and the insulation safety level of the high-voltage cable accessory.
Drawings
FIG. 1 is a schematic diagram illustrating a method for detecting and monitoring interface pressure of a high voltage cable and accessories according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the principle of interface pressure calibration for high-voltage cables and accessories according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an embedded arrangement structure of a grating sensor for use in a method for detecting and monitoring interface pressure of a high-voltage cable and accessories according to an embodiment of the present invention;
in the figure:
1. connecting terminal 2, grating sensor 3, insulating assembly 4, cable semi-conducting layer 5, acquisition controller 6, stress cone 7, cable insulating layer 8, injection port 9, pressure gauge 10 and sealing cylinder
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the contents that are not described in detail in the embodiments of the present invention belong to the prior art known to those skilled in the art.
The invention relates to an interface pressure detection and monitoring device for high-voltage cables and accessories, which has the preferred embodiment that:
the device comprises a wiring terminal, a grating sensor, an insulation assembly, a cable semi-conducting layer, an acquisition controller, a stress cone, a cable insulation layer, an injection port, a pressure gauge and a sealing cylinder body;
the wiring terminal is fixed on a cable core at the end part of the cable insulation layer, the grating sensor is annularly arranged on the cable insulation layer, and a wiring harness of the grating sensor is distributed along the cable insulation layer and the surface of the cable semi-conductive layer and led out to the acquisition controller;
the injection port and the pressure gauge are fixedly arranged on the sealing cylinder body, and the insulating assembly and the stress cone are of an integrated mold forming structure;
the connecting terminal, the cable insulating layer, the grating sensor, the cable semi-conducting layer, the acquisition controller, the injection port, the pressure gauge and the sealing cylinder body jointly form an interface pressure calibration unit;
the wiring terminal, the cable insulating layer, the grating sensor, the cable semi-conducting layer, the acquisition controller, the insulating assembly and the stress cone jointly form an interface pressure detection and monitoring unit.
The grating sensor is embedded and arranged on the cable insulation layer along the circumferential direction and the whole circumference, and the surface of the grating sensor and the wire harness of the grating sensor are flush with the surface of the cable insulation layer.
According to the method for detecting and monitoring the interface pressure of the high-voltage cable and the high-voltage cable accessory, the corresponding relation between the strain capacity of the grating sensor and the surface pressure of the cable insulating layer is established through the interface pressure calibration unit, the strain capacities of the grating sensor under different working conditions are extracted through the interface pressure detection and monitoring unit, and the interface pressure of the high-voltage cable accessory is calculated according to the established corresponding relation.
The interface pressure calibration unit uniformly applies pressure on the cable insulation layer and the circumferential surface of the grating sensor, and the medium is compressed air or liquid water.
And when the dependent variable data received by the acquisition controller is lower than a set threshold, an alarm signal is output.
In the invention:
establishing a corresponding relation between the strain capacity of the grating sensor and the surface pressure of the cable insulation layer through the interface pressure calibration unit, extracting the strain capacity of the grating sensor under different working conditions through the interface pressure detection and monitoring unit under the condition that the state and the position of the grating sensor are not changed, calculating the interface pressure of a high-voltage cable accessory according to the established corresponding relation through a logic algorithm of the acquisition controller, and performing recalibration when the arrangement scheme of the grating sensor is changed.
The grating sensor is embedded and arranged on the cable insulation layer along the circumferential direction and the whole circumference, the surface of the grating sensor and the wire harness of the grating sensor are flush with the surface of the cable insulation layer, the grating sensor is not damaged when assembled into a high-voltage cable accessory, the grating sensor can be stressed uniformly, and the detection and monitoring accuracy is improved.
The interface pressure calibration unit uniformly applies pressure on the cable insulation layer and the circumferential surface of the grating sensor to simulate the stress state of the cable insulation layer in a high-voltage cable accessory product, and gas media such as compressed air or liquid media such as liquid water are arranged in the sealed cylinder body.
When the strain data received by the acquisition controller is lower than a set threshold value, an alarm signal is output, the interface pressure state of the high-voltage cable accessory is monitored, and the insulation failure risk is identified in time.
The specific embodiment is as follows:
as shown in fig. 1-3, the device and method for detecting and monitoring the interface pressure of the high-voltage cable and accessories of the invention comprises a wiring terminal 1, a grating sensor 2, an insulation assembly 3, a cable semi-conducting layer 4, an acquisition controller 5, a stress cone 6, a cable insulation layer 7, an injection port 8, a pressure gauge 9 and a sealing cylinder 10, wherein the cable insulation layer 7 is provided with a mounting groove for the grating sensor 2 and a wiring harness thereof. The wiring terminal 1 is fixed on a cable core at the end part of a cable insulation layer 7, the grating sensor 2 is annularly arranged on the cable insulation layer 7, and a wiring harness of the grating sensor 2 is distributed along the surfaces of the cable insulation layer 7 and the cable semi-conducting layer 4 and led out to the acquisition controller 5; the injection pressure port 8 and the pressure gauge 9 are fixedly arranged on the sealed cylinder body 10, and the insulating assembly 3 and the stress cone 6 are of an integrated mold forming structure; the interface pressure calibration unit is composed of a wiring terminal 1, a cable insulation layer 7, a grating sensor 2, a cable semi-conductive layer 4, an acquisition controller 5, a pressure injection port 8, a pressure gauge 9 and a sealing cylinder 10; the connecting terminal 1, the cable insulating layer 7, the grating sensor 2, the cable semi-conducting layer 4, the acquisition controller 5, the insulating assembly 3 and the stress cone 6 jointly form an interface pressure detection and monitoring unit. In the embodiment, the structural forms of the wiring terminal 1 and the stress cone 6 and the layout scheme of the grating sensor 2 are directed to a prefabricated outdoor terminal, and other types of high-voltage cable accessories are also applicable, such as a T-shaped connector, a heat-shrinkable outdoor terminal, an indoor terminal, an L-shaped connector and the like.
The corresponding relation between the strain capacity of the grating sensor 2 and the surface pressure of the cable insulation layer 7 is established through the interface pressure calibration unit, under the condition that the state and the position of the grating sensor 2 are not changed, the strain capacity of the grating sensor 2 under different working conditions is extracted through the interface pressure detection and monitoring unit, the interface pressure of the high-voltage cable accessory is calculated through a logic algorithm of the acquisition controller 5 according to the established corresponding relation, and recalibration is needed when the arrangement scheme of the grating sensor 2 is changed. In this embodiment, the dependent variable of the grating sensor 2 under the condition of temperature and interference variation is extracted, and the correlation among the temperature, the interference, the interface pressure and the breakdown field strength is studied.
The interface pressure calibration unit uniformly applies pressure on the cable insulation layer 7 and the circumferential surface of the grating sensor 2 to simulate the stress state of the cable insulation layer 7 in a high-voltage cable accessory product, and gas media such as compressed air or liquid media such as liquid water are filled in the sealed cylinder 10. In this embodiment, compressed air is filled in the sealed cylinder 10, the pressure is 0.5MPa, the pressure gauge 9 is a high-precision pressure gauge, the injection port 8 is a one-way valve port, and the wiring harness of the grating sensor 2 passes through the sealed cylinder 10 through the sealing joint and then is connected with the acquisition controller 5.
When the strain data received by the acquisition controller 5 is lower than a set threshold, an alarm signal is output, the interface pressure state of the high-voltage cable accessory is monitored, and the insulation failure risk is identified in time. In the present embodiment, the set strain threshold corresponds to an interface pressure of 0.2 MPa.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. An interface pressure detection and monitoring device for high-voltage cables and accessories is characterized by comprising a wiring terminal, a grating sensor, an insulation assembly, a cable semi-conducting layer, an acquisition controller, a stress cone, a cable insulation layer, an injection port, a pressure gauge and a sealing cylinder body;
the wiring terminal is fixed on a cable core at the end part of the cable insulation layer, the grating sensor is annularly arranged on the cable insulation layer, and a wiring harness of the grating sensor is distributed along the cable insulation layer and the surface of the cable semi-conductive layer and led out to the acquisition controller;
the injection port and the pressure gauge are fixedly arranged on the sealing cylinder body, and the insulating assembly and the stress cone are of an integrated mold forming structure;
the connecting terminal, the cable insulating layer, the grating sensor, the cable semi-conducting layer, the acquisition controller, the injection port, the pressure gauge and the sealing cylinder body jointly form an interface pressure calibration unit;
the connecting terminal, the cable insulating layer, the grating sensor, the cable semi-conducting layer, the acquisition controller, the insulating assembly and the stress cone jointly form an interface pressure detection and monitoring unit;
the grating sensor is embedded and arranged on the cable insulation layer along the circumferential direction and the whole circumference, and the surface of the grating sensor and the wire harness of the grating sensor are flush with the surface of the cable insulation layer;
establishing a corresponding relation between the strain capacity of the grating sensor and the surface pressure of the cable insulation layer through the interface pressure calibration unit, extracting the strain capacity of the grating sensor under different working conditions through the interface pressure detection and monitoring unit, and calculating the interface pressure of the high-voltage cable accessory according to the established corresponding relation;
the interface pressure calibration unit uniformly applies pressure on the cable insulation layer and the circumferential surface of the grating sensor, and the medium is compressed air or liquid water;
and when the dependent variable data received by the acquisition controller is lower than a set threshold, an alarm signal is output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011447677.1A CN112629721B (en) | 2020-12-09 | 2020-12-09 | Interface pressure detection and monitoring device and method for high-voltage cable and accessories |
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| CN202011447677.1A CN112629721B (en) | 2020-12-09 | 2020-12-09 | Interface pressure detection and monitoring device and method for high-voltage cable and accessories |
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| CN112629721A CN112629721A (en) | 2021-04-09 |
| CN112629721B true CN112629721B (en) | 2022-08-09 |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4365947A (en) * | 1978-07-14 | 1982-12-28 | Gk Technologies, Incorporated, General Cable Company Division | Apparatus for molding stress control cones insitu on the terminations of insulated high voltage power cables |
| CN103076116B (en) * | 2012-12-29 | 2015-02-25 | 上海捷锦电力新材料有限公司 | Method for detecting interfacial pressure of prefabricated cable accessory |
| CN204128717U (en) * | 2014-04-01 | 2015-01-28 | 长缆电工科技股份有限公司 | A kind of interfacial pressure checkout equipment of cable accessory intermediate head main body |
| CN105136356A (en) * | 2015-09-29 | 2015-12-09 | 长缆电工科技股份有限公司 | Testing machine of interface pressure of cable accessory |
| CN106404250B (en) * | 2016-03-21 | 2019-04-19 | 广州供电局有限公司 | The measuring device and its method of cable cold-shrinking intermediate joint interfacial pressure |
| CN106123791B (en) * | 2016-08-24 | 2019-09-24 | 北京同度工程物探技术有限公司 | A kind of cable insulation thickness method of real-time and device |
| CN108318164A (en) * | 2018-04-18 | 2018-07-24 | 南方电网科学研究院有限责任公司 | Interface pressure detection method and device for cable accessory |
| CN109060220A (en) * | 2018-06-21 | 2018-12-21 | 南方电网科学研究院有限责任公司 | Cable accessory interface pressure detection method and device |
| CN208313484U (en) * | 2018-06-21 | 2019-01-01 | 南方电网科学研究院有限责任公司 | Cable accessories interface pressure detection device |
| CN111879449B (en) * | 2020-07-06 | 2021-05-28 | 西安交通大学 | System and method for measuring interface pressure between cable and accessory on line |
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