CN212459800U - A shielding device for a steep wave measuring device - Google Patents
A shielding device for a steep wave measuring device Download PDFInfo
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- CN212459800U CN212459800U CN202020688229.XU CN202020688229U CN212459800U CN 212459800 U CN212459800 U CN 212459800U CN 202020688229 U CN202020688229 U CN 202020688229U CN 212459800 U CN212459800 U CN 212459800U
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Abstract
本申请公开了一种陡波测量装置的屏蔽装置，包括屏蔽罩装置、电缆屏蔽管和屏蔽箱。所述陡波测量装置中的传感器探头将测量到的陡波电压信号通过电缆传输给示波器和触发器，逆变器和蓄电池为所述示波器供电。所述屏蔽罩装置包括壳体和共地连接件，所述壳体保护所述传感器探头不受空间电磁干扰；所述共地连接件能够使所述电缆内部的屏蔽层、所述壳体、所述电缆屏蔽管和所述屏蔽箱共地，使外界电磁辐射直接入地而不对所述电缆产生干扰；所述电缆设置在电缆屏蔽管内，所述电缆屏蔽管防止所述电缆受到空间电磁干扰；所述示波器、所述触发器、所述逆变器和蓄电池放置在所述屏蔽箱内，所述屏蔽箱防止所述示波器等装置受到空间电磁干扰。
The present application discloses a shielding device for a steep wave measurement device, including a shielding cover device, a cable shielding tube and a shielding box. The sensor probe in the steep wave measuring device transmits the measured steep wave voltage signal to an oscilloscope and a trigger through a cable, and an inverter and a battery supply power to the oscilloscope. The shielding cover device includes a casing and a common ground connection piece, the casing protects the sensor probe from electromagnetic interference in space; the common ground connection piece can make the shielding layer inside the cable, the casing, The cable shielding tube and the shielding box share the same ground, so that the external electromagnetic radiation directly enters the ground without causing interference to the cable; the cable is arranged in the cable shielding tube, and the cable shielding tube prevents the cable from being subjected to space electromagnetic interference ; The oscilloscope, the trigger, the inverter and the battery are placed in the shielding box, and the shielding box prevents the oscilloscope and other devices from being subjected to space electromagnetic interference.
Description
Technical Field
The application relates to the technical field of condition monitoring of ultrahigh voltage power transmission equipment, in particular to a shielding device of a steep wave measuring device.
Background
A gas insulated transmission line (GIL) can form a transient overvoltage steep wave in a discharge fault, so that the transient overvoltage steep wave is an important monitoring object for positioning a discharge fault point in the GIL. In order to monitor transient overvoltage steep waves on the site of the built GIL equipment conveniently, a steep wave measuring device is often installed in a transformer substation.
The existing steep wave measuring device usually places a sensor probe at a high position to monitor transient overvoltage steep waves, and then the sensor probe transmits measured steep wave voltage signals to an oscilloscope for recording through a cable. However, the electromagnetic environment of a transformer substation site is complex, electromagnetic radiation in the space can cause serious interference to the GIL steep wave measuring device, the measuring accuracy of the GIL steep wave measuring device can be influenced, and the GIL steep wave measuring device can be damaged.
Therefore, there is a need in the art to solve the problem of spatial electromagnetic interference.
SUMMERY OF THE UTILITY MODEL
The application provides a steep wave measuring device's shield assembly to solve steep wave measuring device and receive space electromagnetic interference's problem.
The embodiment of the application provides a steep wave measuring device's shield assembly, including shield cover device, cable shield pipe and shielded cell.
The shielding case device comprises a shell and a common ground connecting piece detachably connected with the shell; the steep wave measuring device comprises a sensor probe protective cover, a sensor probe, a cable connecting piece and a cable; the sensor probe protective cover, the sensor probe and the shell are sequentially detachably connected from top to bottom; the shell and the sensor probe protective cover are both smooth curved surfaces.
One end of the cable connecting piece is connected with the sensor probe; the cable comprises a main cable, a first branch and a second branch, one end of the main cable is connected with the other end of the cable connecting piece, and the first branch and the second branch are respectively connected with the other end of the main cable; the common ground connector is also detachably connected with the sensor probe and the cable connector.
One end of the cable shielding pipe is connected with the shell, and the other end of the cable shielding pipe is connected with the shielding box; the main cable is arranged inside the cable shield pipe.
The shielding box comprises a cabinet body, a cabinet door and an insulating partition plate; the cabinet body is connected with the cabinet door; the insulating partition plate is arranged on the bottom plate of the cabinet body; the steep wave measuring device also comprises a trigger device, an oscilloscope, an inverter and a storage battery which are arranged in the cabinet body; one end of the first branch circuit, which is far away from the main cable, is connected with the oscilloscope through the trigger device, one end of the second branch circuit, which is far away from the main cable, is connected with the oscilloscope, and the oscilloscope is connected with the storage battery through the inverter; the oscilloscope, the inverter and the storage battery are all placed on the insulating partition plate; the cabinet body is grounded.
Optionally, the housing and the sensor probe protective cover are both hemispherical in shape.
Optionally, a shell connecting piece is arranged at the upper end of the shell, and a plurality of equidistant shell connecting holes are formed in the shell connecting piece; the sensor probe is provided with a plurality of sensor connecting holes; the lower extreme of sensor probe safety cover is provided with the safety cover connecting piece, be provided with the equidistant safety cover connecting hole that distributes of a plurality of on the safety cover connecting piece, the casing connecting hole the sensor connecting hole with the safety cover connecting hole is mutually supported.
Optionally, a cover pipe connecting piece is arranged on the smooth curved surface of the shell, and a thread is arranged inside the cover pipe connecting piece; and the outside of the port at one end of the cable shielding pipe is provided with threads matched with the threads in the cover pipe connecting piece.
Optionally, the cable connector is a BNC connector provided with an internal thread; the lower end face of the sensor probe is provided with a probe connecting piece, and the probe connecting piece is provided with an external thread matched with the internal thread of the BNC connector; one end of the common ground connector is provided with a circular ring, and the circular ring is sleeved on the probe connector and is positioned between the probe connector and the BNC connector; and the other end of the common ground connecting piece is provided with a metal filament which is connected to the shell through an aluminum foil adhesive tape.
Optionally, the cable is a coaxial cable.
Optionally, a top plate of the cabinet body is provided with a pipe box connecting piece, and threads are arranged inside the pipe box connecting piece; and the outside of the port at one end of the cable shielding pipe is provided with threads matched with the threads in the pipe box connecting piece.
Optionally, the shielding box further comprises a baffle; the baffle sets up the inside of the cabinet body, be provided with the through-hole on the baffle. The insulating partition plates comprise baffle insulating partition plates and bottom plate insulating partition plates, the baffle insulating partition plates are placed on the baffles, and the bottom plate insulating partition plates are placed on the bottom plate of the cabinet body; the oscilloscope is placed on the baffle insulating partition plate, and the inverter and the storage battery are placed on the bottom plate insulating partition plate; the oscilloscope is connected with the inverter through a lead penetrating through the through hole.
Optionally, a copper shielding reed is arranged at a joint of the cabinet door and the cabinet body.
Optionally, the shielding box further includes a ground terminal and a ground wire, one end of the ground terminal is connected to one side outside the cabinet body, and the other end of the ground terminal is connected to the ground wire.
According to the technical scheme, the shielding cover device in the shielding device of the steep wave measuring device in the embodiment of the application can protect the sensor probe from being corroded by wind and rain, and can shield space electromagnetic interference; the shielding cover device is detachably connected with the sensor probe protection cover, so that the installation and the replacement of equipment such as a sensor probe and the like are facilitated in operation; the common ground connecting piece can enable the shielding layer in the cable, the shell, the cable shielding pipe and the shielding box to be in common ground by connecting the shell and the cable connecting piece, so that external electromagnetic radiation can be directly grounded without interfering with the inner conductive core of the cable; the cable is arranged in the cable shielding pipe, the cable shielding pipe can prevent the cable from being subjected to space electromagnetic interference, and in addition, the cable shielding pipe can also play a role in supporting the sensor probe; the shielding box can protect equipment in the shielding box from being corroded by wind and rain, and can shield space electromagnetic interference; the insulating partition board placed in the shielding box can isolate electromagnetic interference, prevent devices such as an oscilloscope and the like from being damaged due to the influence of ground potential, and enhance the shielding effect of the shielding box.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a shielding device of a steep wave measuring device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a cable shielding tube and a shielding box in an embodiment of the present application;
FIG. 3 is a top view of the housing in an embodiment of the present application;
FIG. 4 is a schematic illustration of an embodiment of the present application showing the case, sensor probe, and sensor probe protective cover unconnected;
FIG. 5 is a schematic structural diagram of the connection of the housing, the sensor probe and the sensor probe protective cover in the embodiment of the present application;
FIG. 6 is a schematic view of the probe connector and cable connector of an embodiment of the present application shown disconnected;
FIG. 7 is a schematic view of the probe connector and cable connector connection in an embodiment of the present application;
FIG. 8 is a schematic structural diagram of a common ground connection in an embodiment of the present application;
FIG. 9 is a top view of a baffle in an embodiment of the present application.
Wherein: 1-a shield can arrangement; 101-a housing; 1011-housing connection; 10111-housing attachment holes; 1012-cover tube connection; 102-common ground connection; 2-cable shielding tube; 3-a shielding box; 301-a cabinet body; 3011-a tube box connector; 302-cabinet door; 303-insulating spacers; 3031-baffle insulating barrier; 3032-a backplane insulating barrier; 304-a baffle; 3041-a through hole; 305-a ground terminal; 306-ground line; 4-sensor probe protective cover; 401 — a boot connection; 4011 — a protective cover connection hole; 5-a sensor probe; 501-sensor connection hole; 502-probe connector; 6-cable connection; 7-a cable; 701-main cable; 702-a first branch; 703-a second branch; 8-a trigger device; 9-an oscilloscope; 10-an inverter; 11-storage battery.
Detailed Description
The present application will now be described in further detail with reference to the accompanying drawings.
The embodiment of the application provides a shielding device of a steep wave measuring device, as shown in fig. 1 and 2, which comprises a shielding case device 1, a cable shielding pipe 2 and a shielding box 3.
The shielding cage arrangement 1 comprises a housing 101 and a common ground connection 102; the steep wave measuring device comprises a sensor probe protective cover 4, a sensor probe 5, a cable connecting piece 6 and a cable 7; the shape of the shell 101 is a smooth curved surface, the shell is made of aluminum materials, the sensor probe 5 is protected from wind and rain erosion, space electromagnetic interference can be shielded, the field intensity distribution of the surface of the shell can be uniform due to the curved surface of the shell 101, and the efficiency of shielding external electromagnetic interference is improved; the sensor probe protection cover 4 is a smooth curved surface, and the curved surface of the sensor probe protection cover 4 can be used for uniformly distributing the field intensity on the surface of the sensor probe protection cover 4, so that the efficiency of shielding external electromagnetic interference is improved; the sensor probe 5 is circular, the sensor probe 5 is placed below an overhead line led out from a GIL outlet sleeve, a high-voltage arm of a capacitance voltage division structure is formed by stray capacitance between the overhead line and a sensor electrode plate to measure steep wave voltage, and then a measured voltage signal is transmitted to the oscilloscope 9 or the acquisition card through the cable 7 to be recorded; the sensor probe protection cover 4, the sensor probe 5 and the shell 101 are sequentially detachably connected from top to bottom.
One end of the cable connecting piece 6 is connected with the sensor probe 5; the cable 7 comprises a main cable 701, a first branch 702 and a second branch 703, one end of the main cable 701 is connected with the other end of the cable connector 6, and the first branch 702 and the second branch 703 are respectively connected with the other end of the main cable 701. The cable 7 has a structure including a solid or stranded inner conductive core, a shielding layer, a mesh-like conductive layer, and a sheath, wherein the inner conductive core of the cable 7 is usually brass, and the shielding layer of the cable 7 is a plastic insulating layer.
One end of the common ground connector 102 is detachably connected with the sensor probe 5 and the cable connector 6, and the other end of the common ground connector 102 is detachably connected with the inner side surface of the housing 101, so that the common ground connector 102 can make the shielding layer inside the cable 7, the housing, the cable shielding tube 2 and the shielding box 3 be in common ground, so that external electromagnetic radiation can be directly grounded without interfering with the cable 7.
The cable shielding tube 2 is of a hollow tubular structure, the length of the cable shielding tube is 1.8m, the outer diameter of the cable shielding tube is 22mm, and the inner diameter of the cable shielding tube is 18 mm; the material of the cable shielding tube 2 is preferably brass, and can also be stainless steel according to the requirement; one end of the cable shielding pipe 2 is detachably connected with the shell 101, and the cable shielding pipe plays a role in supporting the sensor probe; the other end of the cable shielding pipe 2 is detachably connected with the shielding box 3.
The main cable 701 is arranged in the cable shielding pipe 2, and the cable shielding pipe 2 can protect the main cable 701 from space electromagnetic interference. When the main cable 701 transmits a voltage signal, due to the complex electromagnetic environment of a transformer substation, an external interference source can be electromagnetically coupled to the shielding layer, so that interference voltage is induced in the shielding layer, and interference is generated on the voltage signal transmitted on the inner conductor, when the main cable 701 is protected by the cable shielding pipe 2, the cable shielding pipe 2 provides a layer of metal shielding for the main cable 701, and in addition, the shielding layer originally arranged in the main cable 701 is provided, and at the moment, the inner-layer conductive core of the main cable 701 is equivalent to double-shielding protection. After the conductive core is protected by double shielding, an external interference source is electromagnetically coupled to the cable shielding tube 2, and two ends of the shielding layer of the main cable 701 are grounded, so that external electromagnetic radiation can be directly grounded without interfering with the inner conductive core of the main cable 701.
In addition, because the cable shielding pipe 2 with the shielding case device 1 with the shielding case 3 all can be dismantled and be connected, conveniently select different length according to actual conditions in practical application the cable shielding pipe 2 makes the altitude mixture control on 5 apart from the ground of sensor is more convenient.
The shielding box 3 comprises a cabinet body 301, a cabinet door 302 and an insulating partition plate 303; the cabinet body 301 is made of stainless steel and can shield electromagnetic interference in space; the cabinet body 301 is 50cm × 50cm × 80cm in size; the cabinet door 302 is connected with the cabinet body 301; the insulating partition plate 303 is arranged on the bottom plate of the cabinet body 301; the insulating partition plate 303 is made of epoxy resin, and the insulating partition plate 303 can isolate electromagnetic interference, prevent equipment such as an oscilloscope and the like from being damaged due to the influence of ground potential, and enhance the shielding effect of the shielding box.
The steep wave measuring device further comprises a trigger device 8, an oscilloscope 9, an inverter 10 and a storage battery 11 which are arranged in the cabinet body 301; the trigger device 8 is common electrical equipment and is mainly used for sending a trigger signal to an oscilloscope to store waveforms when steep waves occur, and the technical indexes are trigger sensitivity: 10 mV; response signal speed: 10 ns; input signal bandwidth: 0-50 MHz; input impedance: 1M omega; trigger level range: 0 to +/-2.5V; maximum amplitude of input signal: 10V plus or minus; output level: and +5V at TTL level.
One end of the first branch 702, which is far away from the main cable 701, is connected with the oscilloscope 9 through the trigger device 8, one end of the second branch 703, which is far away from the main cable 701, is connected with the oscilloscope 9, and the oscilloscope 9 is connected with the storage battery 11 through the inverter 10; the oscilloscope 9 receives the voltage signal transmitted by the second branch 703, and then measures and stores the waveform of the steep wave.
The inverter 10 and the storage battery 11 are used for supplying power to the oscilloscope 9. The oscilloscope adopts the power supply scheme of the storage battery 11 and the inverter 10 to prevent the introduction of conducted electromagnetic interference due to external power supply. The oscilloscope 9, the inverter 10 and the storage battery 11 are all placed on the insulating partition plate 303, and the cabinet body 301 is grounded.
In some embodiments, as shown in fig. 1, 4 and 5, the housing 101 and the sensor probe protective cover 4 are each hemispherical in shape, with a gauge of 80mm in diameter. The hemispherical design can make the field intensity distribution on the surface of the shell 101 and the sensor probe protective cover 4 more uniform, and can improve the efficiency of shielding space electromagnetic interference.
In some embodiments, a housing connector 1011 is disposed at the upper end of the housing 101, and a plurality of equally spaced housing connection holes 10111 are disposed on the housing connector 1011, as shown in fig. 3, 4 and 5, the housing connector 1011 is formed by extending the upper end of the housing 101 in the horizontal direction, and 8 equally spaced housing connection holes 10111 are disposed on the housing connector 1011; 8 sensor connecting holes 501 are uniformly distributed on the periphery of the edge of the sensor probe 5; the lower extreme of sensor probe safety cover 4 is provided with safety cover connecting piece 401, safety cover connecting piece 401 by sensor probe safety cover 4's edge extends along the horizontal direction and forms, be provided with 8 equidistant distribution's safety cover connecting hole 4011 on the safety cover connecting piece 401. The case connection hole 10111, the sensor connection hole 501 and the shield connection hole 4011 are respectively engaged.
When the shell 101, the sensor probe 5 and the sensor probe protective cover 4 are required to be connected, as shown in fig. 4 and 5, the shell connecting hole 10111, the sensor connecting hole 501 and the protective cover connecting hole 4011 correspond to each other in operation, then a nut sequentially penetrates through the shell connecting hole 10111, the sensor connecting hole 501 and the protective cover connecting hole 4011, and finally the sensor probe protective cover is fixed by bolts. The detachable connection of the nut and the bolt is utilized, so that the installation and the detachment of the sensor probe 5 are more convenient.
In some embodiments, as shown in fig. 4, a cover pipe connector 1012 is disposed on the housing 101, and the cover pipe connector 1012 is internally provided with threads; the port outside of 2 one ends of cable shield pipe be provided with cover pipe connecting piece 1012 inside screw thread matched with screw thread, cable shield pipe 2 with cover pipe connecting piece 1012 threaded connection has improved steep wave measuring device's shield assembly and maintenance efficiency.
In some embodiments, the cable Connector 6 is a BNC Connector (coaxial cable Connector) provided with an internal thread; the lower end surface of the sensor probe 5 is provided with a probe connector 502, the probe connector 502 is provided with an external thread matched with the internal thread of the BNC connector, and the probe connector 502 is in threaded connection with the BNC connector; a circular ring is arranged at one end of the common ground connector 102, is sleeved on the probe connector 502 and is positioned between the probe connector 502 and the BNC connector; the other end of the common ground connector 102 is provided with a metal filament connected to the housing 101 by an aluminum foil tape. In practice, referring to fig. 6, 7 and 8, the common ground connector 102 can be disposed between the probe connector 502 and the BNC connector by fitting the ring of the common ground connector 102 over the external threads of the probe connector 502 and then tightening the probe connector 502 with the BNC connector. In these embodiments, the connection of the common ground connector 102 to the cable connector 6 and the housing 101 is very simple, which improves the efficiency of maintaining and replacing the common ground connector 102. In practice, the corresponding BNC connector can be selected based on the type of sensor probe connector 502.
In some embodiments, the cable 7 is a coaxial cable. The coaxial cable has a shielding layer in the inner structure, so that the electromagnetic interference in the space can be shielded.
In some embodiments, as shown in fig. 2, a top plate of the cabinet 301 is provided with a channel connector 3011, and the channel connector 3011 is internally provided with threads; and the outside of a port at one end of the cable shielding pipe 2 is provided with a thread matched with the internal thread of the pipe box connecting piece 3011. The cable shield pipe 2 and the cover pipe connecting piece 1012 are connected in a threaded manner, so that the installation and maintenance efficiency of the shielding device of the steep wave measuring device is improved.
In some embodiments, as shown in fig. 1, 2 and 9, the shielding cage 3 further comprises a baffle 304; the baffle 304 is arranged inside the cabinet body 301, and a through hole 3041 is arranged on the baffle 304; the insulating partition plate 303 comprises a baffle insulating partition plate 3031 and a bottom plate insulating partition plate 3032, the baffle insulating partition plate 3031 is placed on the baffle 304, and the bottom plate insulating partition plate 3032 is placed on the bottom plate of the cabinet body 301; the oscilloscope 9 is placed on the baffle insulating partition plate 3031, and the inverter 10 and the storage battery 11 are placed on the bottom plate insulating partition plate 3032; the oscilloscope 9 is connected to the inverter 10 by a wire passing through the through hole 3041. Will shielding case 3 sets up in layers, can improve space utilization, increases the convenience of installation and change efficiency simultaneously.
In some embodiments, a copper shielding reed is disposed at a joint between the cabinet door 302 and the cabinet body 301, so as to block electromagnetic radiation from penetrating from the joint.
In some embodiments, as shown in fig. 2, the shielding box 3 further includes a ground terminal 305 and a ground line 306, one end of the ground terminal 305 is connected to one side outside the cabinet 301, and the other end of the ground terminal 305 is connected to the ground line 306. The ground terminal 305 and the ground line 306 facilitate grounding of the shield case 3.
According to the technical scheme, the shielding cover device in the shielding device of the steep wave measuring device in the embodiment of the application can protect the sensor probe from being corroded by wind and rain, and can shield space electromagnetic interference; the shielding cover device is detachably connected with the sensor probe protection cover, so that the installation and the replacement of equipment such as a sensor probe and the like are facilitated in operation; the common ground connecting piece can enable the shielding layer in the cable, the shell, the cable shielding pipe and the shielding box to be in common ground by connecting the shell and the cable connecting piece, so that external electromagnetic radiation can be directly grounded without interfering with the inner conductive core of the cable; the cable is arranged in the cable shielding pipe, the cable shielding pipe can prevent the cable from being subjected to space electromagnetic interference, and in addition, the cable shielding pipe can also play a role in supporting the sensor probe; the shielding box can protect equipment in the shielding box from being corroded by wind and rain, and can shield space electromagnetic interference; the insulating partition board placed in the shielding box can isolate electromagnetic interference, prevent devices such as an oscilloscope and the like from being damaged due to the influence of ground potential, and enhance the shielding effect of the shielding box.
The embodiments of the present application have been described in detail, but the description is only for the preferred embodiments of the present application and should not be construed as limiting the scope of the application. All equivalent changes and modifications made within the scope of the present application shall fall within the scope of the present application.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020688229.XU CN212459800U (en) | 2020-04-29 | 2020-04-29 | A shielding device for a steep wave measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020688229.XU CN212459800U (en) | 2020-04-29 | 2020-04-29 | A shielding device for a steep wave measuring device |
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| CN212459800U true CN212459800U (en) | 2021-02-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433435A (en) * | 2021-06-24 | 2021-09-24 | 云南电网有限责任公司电力科学研究院 | Steep wave measurement trigger device based on electric signal |
| CN115388923A (en) * | 2022-09-19 | 2022-11-25 | 嘉兴博创智能传感科技有限公司 | Intelligent sensor with good diamagnetic performance |
-
2020
- 2020-04-29 CN CN202020688229.XU patent/CN212459800U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433435A (en) * | 2021-06-24 | 2021-09-24 | 云南电网有限责任公司电力科学研究院 | Steep wave measurement trigger device based on electric signal |
| CN115388923A (en) * | 2022-09-19 | 2022-11-25 | 嘉兴博创智能传感科技有限公司 | Intelligent sensor with good diamagnetic performance |
| CN115388923B (en) * | 2022-09-19 | 2023-12-19 | 深圳市威纳智能科技有限公司 | Intelligent sensor with good antimagnetic performance |
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