CN211603431U - Antenna sensor for monitoring partial discharge of high-voltage cable connector - Google Patents
Antenna sensor for monitoring partial discharge of high-voltage cable connector Download PDFInfo
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- CN211603431U CN211603431U CN202020030972.6U CN202020030972U CN211603431U CN 211603431 U CN211603431 U CN 211603431U CN 202020030972 U CN202020030972 U CN 202020030972U CN 211603431 U CN211603431 U CN 211603431U
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Abstract
The utility model provides an antenna sensor for monitoring is put in high tension cable joint office. The utility model relates to an antenna sensor for monitoring is put in high tension cable joint office, include: a housing, a connector, an antenna and a coaxial cable; the connector is arranged on the shell, and the antenna is arranged inside the shell; the antenna includes: a substrate, a radiation layer and a grounding layer; the radiation layer and the grounding layer are laid on the substrate, and are arranged on the same side of the substrate; the first end of the coaxial cable comprises a core wire and a shielding layer, the core wire of the first end of the coaxial cable is connected with the radiation layer, the shielding layer of the first end of the coaxial cable is connected with the grounding layer, and the second end of the coaxial cable is connected with the joint. The patent of the utility model provides a high frequency pulse sensor sensitivity is low among the prior art, the relatively poor, the high problem of manufacturing cost of interference immunity.
Description
Technical Field
The utility model relates to an electric power technology especially relates to an antenna sensor that is used for high tension cable to connect the partial discharge monitoring.
Background
With the further acceleration of the upgrading and transformation steps of the urban power grid, the high-voltage cable is one of the important components forming the power system network, and the running condition of the high-voltage cable directly influences the overall use condition of the power system. Practice shows that most of power cable insulation faults occur at cable joints, and the reason is that the joints are easy to leave defect hidden dangers during field manufacturing and installation, so that local electric fields are concentrated during operation, and local discharge in an insulating layer is caused. Meanwhile, the corrosion resistance of the cable insulation material is poor, and long-term development of partial discharge finally causes insulation breakdown. Therefore, the monitoring of the partial discharge of the high-voltage cable joint is carried out, and the method has important practical value for guaranteeing the safe operation of the power cable.
At present, the high-voltage cable connector is monitored on line by partial discharge, a high-frequency pulse current method is one of means for detecting partial discharge, a high-frequency pulse current sensor is an important element of the high-frequency pulse current method, a clamp-type piercing openable structure design is usually adopted, and the detection frequency range is usually between 100KHz and 20 MHz. The principle is as follows: by adopting a Rogowski coil structure, a plurality of conductive coils are wound on the annular magnetic core material, and when a high-frequency pulse current passes through the center of the magnetic core, a high-frequency alternating electromagnetic field is generated on the coils to generate induced voltage.
However, the existing high-frequency pulse sensor includes the following drawbacks:
1) the detection frequency band is limited, the detection frequency range of the high-frequency pulse current sensor is usually between 100KHz and 20MHz, and an ultrahigh frequency band cannot be detected, so that the detection information is not rich enough;
2) the anti-interference capability is relatively weak, and electromagnetic signals around and in a detected series circuit can interfere detection, so that the identification of detection signals and the accuracy of detection results are influenced;
3) the manufacturing cost is high. The annular magnetic core material used in the high-frequency pulse current sensor needs to be made of rare materials and is manufactured by combining a special firing process, the manufacturing process is complex, and the manufacturing cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides an antenna sensor for monitoring is put in high tension cable joint office, simple structure, low in manufacturing cost, by interference can the reinforce, the detection frequency range is big.
The utility model provides an antenna sensor for monitoring is put in high tension cable joint office, include:
a housing, a connector, an antenna and a coaxial cable;
the connector is arranged on the shell, and the antenna is arranged inside the shell;
the antenna includes: a substrate, a radiation layer and a grounding layer;
the radiation layer and the grounding layer are laid on the substrate, and are arranged on the same side of the substrate;
the first end of the coaxial cable comprises a core wire and a shielding layer, the core wire of the first end of the coaxial cable is connected with the radiation layer, the shielding layer of the first end of the coaxial cable is connected with the grounding layer, and the second end of the coaxial cable is connected with the joint.
Further, the radiation layer is elliptical; the ground layer is arc-shaped, and the inner side of the arc-shaped ground layer is opposite to the end part of the long axis of the oval radiation layer.
Further, a through hole is arranged between the radiation layer and the ground layer; the core wire of the first end of the coaxial cable passes through the wire passing hole and is connected with one side, close to the wire passing hole, of the grounding layer, and the second end of the coaxial cable is connected with the joint.
Further, the arc length of the arc is greater than the length of the long axis of the ellipse, and the width of the arc is less than 1/4 of the length of the short axis of the radiation layer of the ellipse.
Further, the linker is a BNC linker.
Furthermore, a first hole is formed in the metal ground layer, and the first hole is used for being fixedly connected with the shell.
Furthermore, a second hole is formed in the substrate and used for being fixedly connected with the shell.
The utility model also provides a high tension cable connects, the high tension cable connects the outside foretell antenna sensor that is provided with, the one side that is provided with radiation layer and ground plane on the base plate of the inside antenna of antenna sensor is close to the cable joint setting.
The utility model also provides a monitoring system is put in office for high tension cable connects, including foretell antenna sensor, signal collector and server, signal collector is connected with antenna sensor, signal collector is used for sending the signal of gathering to the server.
The utility model relates to an antenna sensor for monitoring is put in high tension cable joint office is used for the high tension cable joint office through designing antenna sensor and puts the monitoring, realizes that the office that high tension cable connects puts the detection, and low in manufacturing cost, and small, has solved the problem that high frequency pulse sensor manufacturing cost is high among the prior art. And simultaneously, the utility model provides an antenna sensor is simple with the cable joint installation, easy to maintain and change, the utility model discloses well antenna sensor's special construction makes the interference killing feature stronger, the utility model provides an antenna sensor's metal radiation layer adopts oval structure for the detection frequency band scope can reach 300MHz ~ 1GHz, the utility model provides an antenna sensor size is less, portable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a front view of an antenna sensor for partial discharge monitoring of a high-voltage cable connector according to the present invention;
fig. 2 is a left side view of an antenna sensor for partial discharge monitoring of a high voltage cable connector according to the present invention;
fig. 3 is a top view of an antenna sensor for partial discharge monitoring of a high voltage cable connector according to the present invention;
fig. 4 is the utility model relates to a structural schematic diagram of antenna among antenna sensor for monitoring is put in high tension cable joint office.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a front view of an antenna sensor for partial discharge monitoring of a high-voltage cable connector according to the present invention; fig. 2 is a left side view of an antenna sensor for partial discharge monitoring of a high voltage cable connector according to the present invention; fig. 3 is a top view of an antenna sensor for partial discharge monitoring of a high voltage cable connector according to the present invention; fig. 4 is the utility model relates to a structural schematic diagram of antenna among antenna sensor for monitoring is put in high tension cable joint office. Referring to fig. 1 to 4, an antenna sensor for monitoring partial discharge of a high-voltage cable connector according to the present embodiment includes:
the antenna comprises a shell 1, a connector 2, an antenna and a coaxial cable;
the connector 2 is arranged on the shell 1, and the antenna is arranged inside the shell;
the antenna includes: a substrate 3, a radiation layer 4 and a ground layer 5;
the radiation layer 4 and the ground layer 5 are laid on the substrate 3, and the radiation layer 4 and the ground layer 5 are arranged on the same side of the substrate;
the first end of the coaxial cable comprises a core wire and a shielding layer, the core wire of the first end of the coaxial cable is connected with the radiation layer, the shielding layer of the first end of the coaxial cable is connected with the grounding layer, and the second end of the coaxial cable is connected with the joint 2.
The housing in this embodiment may be a plastic housing, specifically, a nylon 66 material.
The connector in this embodiment may be a BNC connector.
The antenna in this embodiment is disposed inside the housing and is therefore not shown in fig. 1-3.
In the antenna structure of this embodiment, the substrate may be a dielectric substrate, the radiation layer is a metal radiation layer, and the ground layer is a metal ground layer.
In this embodiment, the dielectric substrate 3 is a rectangular parallelepiped, has a length of 115mm, a width of 57mm, and a thickness of 2mm, and is made of FR4 (epoxy resin glass fiber board). The substrate is provided with a rectangular through hole 6 between the metal radiation layer and the metal grounding layer for passing a wire.
In this embodiment, the radiation layer and the ground layer are disposed on the same side of the substrate, i.e., on a single surface of the substrate.
In this embodiment, the coaxial cable connects the antenna and the connector to complete transmission of the received signal.
In this embodiment, optionally, the radiation layer is elliptical; the ground layer is arc-shaped, and the inner side of the arc-shaped ground layer is opposite to the end part of the long axis of the oval radiation layer.
The radiation layer in this embodiment is used for receiving an electromagnetic wave signal generated by a partial discharge, and has an elliptical shape, specifically, the major axis of the elliptical shape may be 44.5mm, and the minor axis is 22.47 mm.
The ground plane in this embodiment is an arc, specifically, the arc length may be 52.49mm, and the arc width may be 4.72 mm.
In this embodiment, the size of the ground layer is much smaller than the size of the metal radiation layer.
In this embodiment, the arc has an arc length greater than the major axis length of the ellipse and an arc width less than 1/4 the length of the minor axis.
Optionally, a wire through hole is disposed between the radiation layer and the ground layer; the core wire of the first end of the coaxial cable penetrates through the wire passing hole, the core wire of the first end of the coaxial cable is connected with one side, close to the wire passing hole, of the radiation layer, the shielding layer of the first end of the coaxial cable is connected with one side, close to the wire passing hole, of the grounding layer, and the second end of the coaxial cable is connected with the joint. That is, the shielding layer of the coaxial cable is stripped, the core wire and the insulating layer pass through the wire passing hole, the core wire is connected with the radiation layer on the first side of the wire passing hole, and the shielding layer is connected with the grounding layer on the second side of the wire passing hole.
Specifically, the antenna sensor coaxial cable wiring mode is as follows: the first end of the coaxial cable is divided into a core wire and a shielding layer, the core wire is in welded connection with one point of the antenna metal radiation layer closest to the rectangular wire passing hole, and the shielding layer is in welded connection with one point of the antenna metal grounding layer closest to the rectangular wire passing hole. The second end of the coaxial cable is connected with the BNC connector on one side of the plastic shell through the rectangular wire passing hole to complete the transmission of the received signal.
In this embodiment, a first hole is disposed on the metal ground layer, and the first hole is used for being fixedly connected to the housing. Optionally, a second hole is formed in the substrate, and the second hole is used for being fixedly connected with the housing.
The antenna in this embodiment has the maximum gain in the Z direction (the plane of the dielectric substrate is taken as the XOY reference plane).
The characteristic impedance of the antenna in this embodiment is 50 Ω.
The standing wave ratio of the antenna in this embodiment is 1.3. The standing wave Ratio is called Voltage standing wave Ratio (Voltage standing wave Ratio) and refers to the Ratio of the Voltage of the antinode of the standing wave to the Voltage amplitude of the valley (i.e. the Ratio of the maximum Voltage value to the minimum Voltage value). When the standing-wave ratio is 1, the antenna is in a theoretically optimal state, and the characteristic at the moment is that high-frequency energy is completely radiated by the antenna, and the reflection loss of electromagnetic wave energy does not exist. In fact, the standing-wave ratio is below 1.5 to meet the application requirements. Therefore, the antenna meets the requirement of a sensor for detecting the antenna by partial discharge of the high-voltage cable joint.
The antenna sensor in this embodiment is used for partial discharge monitoring, and specifically, the antenna sensor is mounted on a high-voltage cable connector, and one side of an antenna substrate inside the antenna sensor, on which a radiation layer and a ground layer are provided, is disposed near the cable connector.
The antenna sensor in this embodiment can be used for a partial discharge detection system, and specifically includes the antenna sensor, the signal collector and the server in this embodiment, the signal collector is connected with the antenna sensor, and the signal collector is used for sending a collected signal to the server.
The antenna sensor may be mounted in the following manner: the sensor is directly attached and fixed outside the cable joint through the binding belt, wherein one side of the antenna metal radiation layer and one side of the grounding layer are close to the cable joint, and the purpose of detecting the electromagnetic wave signals generated by partial discharge is achieved on the premise of not influencing the field intensity of the cable joint.
The utility model also provides a high tension cable connects, the high tension cable connects the outside foretell antenna sensor that is provided with, the one side that is provided with radiation layer and ground plane on the base plate of the inside antenna of antenna sensor is close to the cable joint setting.
The utility model also provides a monitoring system is put in office for high tension cable connects, including foretell antenna sensor, signal collector and server, signal collector is connected with antenna sensor, signal collector is used for sending the signal of gathering to the server.
The utility model relates to an antenna sensor for monitoring is put in high tension cable joint office is used for the high tension cable joint office through designing antenna sensor and puts the monitoring, realizes that the office that high tension cable connects puts the detection, and low in manufacturing cost, and small, has solved the problem that high frequency pulse sensor manufacturing cost is high among the prior art. And simultaneously, the utility model provides an antenna sensor is simple with the cable joint installation, easy to maintain and change, the utility model discloses well antenna sensor's special construction makes the interference killing feature stronger, the utility model provides an antenna sensor's metal radiation layer adopts oval structure for the detection frequency band scope can reach 300MHz ~ 1GHz, the utility model provides an antenna sensor size is less, portable.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. An antenna sensor for monitoring partial discharge of a high voltage cable connector, comprising:
a housing, a connector, an antenna and a coaxial cable;
the connector is arranged on the shell, and the antenna is arranged inside the shell;
the antenna includes: a substrate, a radiation layer and a grounding layer;
the radiation layer and the grounding layer are laid on the substrate, and are arranged on the same side of the substrate;
the first end of the coaxial cable comprises a core wire and a shielding layer, the core wire of the first end of the coaxial cable is connected with the radiation layer, the shielding layer of the first end of the coaxial cable is connected with the grounding layer, and the second end of the coaxial cable is connected with the joint.
2. The antenna sensor of claim 1,
the radiation layer is elliptical; the ground layer is arc-shaped, and the inner side of the arc-shaped ground layer is opposite to the end part of the long axis of the oval radiation layer.
3. The antenna sensor according to claim 1 or 2,
a wire through hole is arranged between the radiation layer and the grounding layer; the core wire of the first end of the coaxial cable penetrates through the wire passing hole to be connected with one side, close to the wire passing hole, of the radiation layer, the shielding layer of the first end of the coaxial cable is connected with one side, close to the wire passing hole, of the grounding layer, and the second end of the coaxial cable is connected with the joint.
4. The antenna sensor of claim 2,
the arc has an arc length greater than the major axis length of the ellipse and a width less than 1/4 the length of the minor axis of the elliptical radiation layer.
5. The antenna sensor of claim 1,
the connector is a BNC connector.
6. The antenna sensor of claim 1,
the grounding layer is provided with a first hole, and the first hole is used for being fixedly connected with the shell.
7. The antenna sensor of claim 6,
the base plate is provided with a second hole, and the second hole is used for being fixedly connected with the shell.
8. The antenna sensor according to claim 1, wherein the side of the antenna inside the antenna sensor on which the radiation layer and the ground layer are provided is provided near a cable connector.
9. The antenna sensor of claim 1, wherein the antenna sensor comprises a signal collector and a server, the signal collector is connected with the antenna sensor, and the signal collector is configured to send a collected signal to the server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020030972.6U CN211603431U (en) | 2020-01-08 | 2020-01-08 | Antenna sensor for monitoring partial discharge of high-voltage cable connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020030972.6U CN211603431U (en) | 2020-01-08 | 2020-01-08 | Antenna sensor for monitoring partial discharge of high-voltage cable connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211603431U true CN211603431U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020030972.6U Active CN211603431U (en) | 2020-01-08 | 2020-01-08 | Antenna sensor for monitoring partial discharge of high-voltage cable connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211603431U (en) |
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2020
- 2020-01-08 CN CN202020030972.6U patent/CN211603431U/en active Active
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