CN217467007U - High-tension bushing end screen voltage signal acquisition device - Google Patents
High-tension bushing end screen voltage signal acquisition device Download PDFInfo
- Publication number
- CN217467007U CN217467007U CN202122532584.5U CN202122532584U CN217467007U CN 217467007 U CN217467007 U CN 217467007U CN 202122532584 U CN202122532584 U CN 202122532584U CN 217467007 U CN217467007 U CN 217467007U
- Authority
- CN
- China
- Prior art keywords
- signal
- cable
- box
- secondary voltage
- matching resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a high-voltage bushing end screen voltage signal acquisition device. Wherein, the device comprises a secondary partial pressure box; the secondary voltage division box is an all-metal sealing box, and the surface of the box body is provided with a signal input port and a signal output port which are respectively used for connecting a short lead and a wiring terminal of a signal cable; a signal wire, a matching resistor, a piezoresistor and a capacitor are arranged in the secondary voltage-dividing box, the signal wire is a cable with an insulating sheath, one end of the signal wire is connected with the core part of the signal input port, and the other end of the signal wire is connected with the matching resistor; the matching resistor is a color ring resistor, the resistance value of the matching resistor is consistent with the wave impedance value of the signal cable, and the matching resistor is connected to the core part of the signal output port; the two piezoresistors are close to the signal input port, one end of each piezoresistor is connected with the signal wire, and the other end of each piezoresistor is connected with the metal of the shell of the secondary voltage division box; the capacitor is arranged between the piezoresistor and the matching resistor, one end of the capacitor is connected with the signal wire, and the other end of the capacitor is connected with the secondary voltage division box shell metal.
Description
Technical Field
The invention relates to the field of online monitoring of the bushing voltage of primary power equipment such as a transformer and a high-voltage reactor, in particular to a high-voltage bushing end screen voltage signal acquisition device.
Background
With the development of the intelligent technology of the power system, the power of the transformer, the high-voltage reactor and the like is set at one timeThe voltage on-line monitoring system of the standby bushing is also widely applied. The measurement loop is shown with reference to fig. 1: the medium from the core of the sleeve to the end screen of the sleeve can be equivalent to a capacitor C 1 (1) The stray capacitance to the ground of the end screen of the sleeve is equivalent to C 2 (2) Externally connected with a capacitor C 3 (3)。C 3 And C 2 In parallel, together with C 1 Constitute a capacitive voltage dividing unit. If the amplitude of the primary side input voltage is U 1 Secondary side output voltage U 2 The following relationship is satisfied:
U 2 ＝U 1 C 1 /(C 1 +C 2 +C 3 )
due to C 1 And C 2 In the order of pF to nF, C 3 At μ F scale, C 1 And C 2 Is much smaller than C 3 The above formula can be simplified as follows:
U 2 ≈U 1 C 1 /C 3
voltage U 2 Transmitted to the wave recording device through the signal cable. Wherein, 1 is the equivalent capacitance between sleeve pipe core and the sleeve pipe end screen, 2 is sleeve pipe end screen stray capacitance to ground, 3 is external capacitor, 4 is the signal line, and 5 is the recording equipment.
There are several areas in the existing bushing voltage on-line monitoring systems that need improvement: the problems of voltage traveling wave refraction and reflection and poor anti-electromagnetic interference capability are not considered.
Disclosure of Invention
The invention provides a signal acquisition device of a high-voltage bushing end screen capacitance voltage selection method, aiming at solving the technical problems that voltage traveling wave refraction and reflection are not considered in a bushing voltage on-line monitoring system in the prior art and the anti-electromagnetic interference capability is poor.
According to one aspect of the application, a high-voltage bushing tap voltage signal acquisition device is provided, and the device comprises a tap adapter, a short lead, a secondary voltage division box, a signal cable, a wave recording device and an isolation transformer;
the secondary voltage division box is an all-metal sealing box, and the surface of the box body is provided with a signal input port and a signal output port which are respectively used for connecting a short lead and a wiring terminal of a signal cable;
a signal wire, a matching resistor, a piezoresistor and a capacitor are arranged in the secondary voltage dividing box, the signal wire is a cable with an insulating sheath, one end of the signal wire is connected with the core part of the signal input port, and the other end of the signal wire is connected with the matching resistor; the matching resistor is a color ring resistor, the resistance value of the matching resistor is consistent with the wave impedance value of the signal cable, and the matching resistor is connected to the core part of the signal output port; the two piezoresistors are close to the signal input port, one end of each piezoresistor is connected with a signal wire, and the other end of each piezoresistor is connected with the metal of the shell of the secondary voltage dividing box; the capacitor is arranged between the piezoresistor and the matching resistor, one end of the capacitor is connected with the signal wire, and the other end of the capacitor is connected with the secondary voltage division box shell metal.
Optionally, the end screen adapter is of a full-sealed type, the output end of the end screen adapter is provided with a signal port, an end screen voltage signal is led out, and the shell of the end screen adapter is connected with the casing of the sleeve.
Optionally, the short lead is a coaxial cable with a shielding layer, one end of the coaxial cable is connected to the signal port of the end screen adapter, and the other end of the coaxial cable is connected to the signal input port of the secondary voltage dividing box.
Optionally, the signal cable is a coaxial cable with a shielding layer, one end of the coaxial cable is connected with the signal output port of the secondary voltage dividing box, and the other end of the coaxial cable is connected with the signal input port of the wave recording device.
Optionally, the isolation transformer is arranged between a power line of the wave recording device and a public network, and the power of the isolation transformer meets the requirement of the wave recording device.
Optionally, the shell of the end screen adapter, the shielding layer of the short lead, the shell of the secondary voltage dividing box, the shielding layer of the signal cable and the shell of the signal input port of the wave recording device are tightly connected with each other, and the shielding layer and the shell of the signal input port of the wave recording device are kept at the same ground potential and completely wrapped in a metal body used for transmitting voltage signals.
Therefore, according to the high-voltage bushing end screen voltage signal acquisition device, the problem of voltage traveling wave refraction and reflection between an external capacitor and a signal cable is solved, the anti-electromagnetic interference capability is improved, and voltage waveform offset distortion is prevented.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic diagram of a measurement circuit as described in the background;
fig. 2 is a schematic structural diagram of a high-voltage bushing tap voltage signal acquisition device according to this embodiment;
the main reference numerals in the present embodiment are as follows:
the device comprises a tail screen adapter-1, a short lead-2, a secondary voltage division box-3, a signal cable-4, a wave recording device-5, an isolation transformer-6, a sleeve shell-7, a signal input port-8, a signal output port-9, a signal wire-10, a matching resistor-11, a piezoresistor-12 and a capacitor-13.
Detailed Description
It should be noted that, in the present disclosure, the embodiments and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing the embodiments of the disclosure herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Referring to fig. 2, fig. 2 is a schematic diagram of a high voltage bushing tap voltage signal acquisition device according to an embodiment of the present application. The device comprises an end screen adapter 1, a short lead 2, a secondary voltage division box 3, a signal cable 4, a wave recording device 5 and an isolation transformer 6;
the secondary voltage division box 3 is an all-metal sealing box, and the surface of the box body is provided with a signal input port 8 and a signal output port 9 which are respectively used for connecting the short lead 2 and a wiring terminal of the signal cable 4;
a signal wire 10, a matching resistor 11, a piezoresistor 12 and a capacitor 13 are arranged in the secondary voltage division box 3, the signal wire 10 is a cable with an insulating sheath, one end of the signal wire is connected with the core part of the signal input port 8, and the other end of the signal wire is connected with the matching resistor 11; the matching resistor 11 is a color ring resistor, the resistance value of the matching resistor 11 is consistent with the wave impedance value of the signal cable 4, and the matching resistor is connected to the core part of the signal output port 9; the two piezoresistors 12 are close to the signal input port 8, one end of each piezoresistor is connected with the signal wire 10, and the other end of each piezoresistor is connected with the metal shell of the secondary voltage division box 3; and the capacitor 13 is arranged between the voltage dependent resistor 12 and the matching resistor 11, one end of the capacitor is connected with the signal wire 10, and the other end of the capacitor is connected with the metal shell of the secondary voltage division box 3.
Optionally, the end screen adapter 1 is of a full-sealed type, the output end of the end screen adapter is provided with a signal port, an end screen voltage signal is led out, and the end screen adapter shell is connected with the sleeve shell 7.
Optionally, the short lead 2 is a coaxial cable with a shielding layer, one end of the coaxial cable is connected to the signal port of the end screen adapter 1, and the other end of the coaxial cable is connected to the signal input port of the secondary voltage dividing box 3.
Optionally, the signal cable 4 is a coaxial cable with a shielding layer, one end of the coaxial cable is connected to the signal output port 9 of the secondary voltage dividing box, and the other end of the coaxial cable is connected to the signal input port of the wave recording device 5.
Optionally, the isolation transformer 6 is arranged between a power line of the wave recording device 5 and a public network, and the power of the isolation transformer 6 meets the requirement of the wave recording device 5.
Optionally, the shell of the end screen adapter 1, the shielding layer of the short lead 2, the shell of the secondary voltage dividing box 3, the shielding layer of the signal cable 4 and the shell of the signal input port of the wave recording device 5 are tightly connected with each other, and the same ground potential is maintained, while the metal body for transmitting voltage signals is completely wrapped inside.
Therefore, according to the high-voltage bushing end screen voltage signal acquisition device, the problem of voltage traveling wave refraction and reflection between an external capacitor and a signal cable is solved, the anti-electromagnetic interference capability is improved, and voltage waveform offset distortion is prevented.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In the description of the present disclosure, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are provided only for convenience of description and for simplicity of description, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
The above description is only for the preferred embodiment of the present application, but the scope of the present application 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 application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A high-voltage bushing end screen voltage signal acquisition device is characterized in that,
the device comprises an end screen adapter (1), a short lead (2), a secondary voltage division box (3), a signal cable (4), a wave recording device (5) and an isolation transformer (6);
the secondary voltage division box (3) is an all-metal sealing box, and the surface of the box body is provided with a signal input port (8) and a signal output port (9) which are respectively used for connecting the short lead (2) and a wiring terminal of the signal cable (4);
a signal wire (10), a matching resistor (11), a piezoresistor (12) and a capacitor (13) are arranged in the secondary voltage division box (3), the signal wire (10) is a cable with an insulating sheath, one end of the signal wire is connected with the core part of the signal input port (8), and the other end of the signal wire is connected with the matching resistor (11); the matching resistor (11) adopts a color ring resistor, the resistance value of the matching resistor (11) is consistent with the wave impedance value of the signal cable (4), and the matching resistor is connected to the core part of the signal output port (9); the two piezoresistors (12) are close to the signal input port (8), one end of each piezoresistor is connected with the signal wire (10), and the other end of each piezoresistor is connected with the shell metal of the secondary voltage division box (3); and the capacitor (13) is arranged between the piezoresistor (12) and the matching resistor (11), one end of the capacitor is connected with the signal line (10), and the other end of the capacitor is connected with the metal shell of the secondary voltage division box (3).
2. The apparatus of claim 1,
the end screen adapter (1) is of a full-sealed type, a signal port is arranged at the output end of the end screen adapter, an end screen voltage signal is led out, and the shell of the end screen adapter is connected with the casing (7) of the sleeve.
3. The apparatus of claim 1,
and the short lead (2) is a coaxial cable with a shielding layer, one end of the coaxial cable is connected with the signal port of the end screen adapter (1), and the other end of the coaxial cable is connected with the signal input port of the secondary voltage dividing box (3).
4. The apparatus of claim 1,
the signal cable (4) is a coaxial cable with a shielding layer, one end of the coaxial cable is connected with a signal output port (9) of the secondary voltage division box, and the other end of the coaxial cable is connected with a signal input port of the wave recording device (5).
5. The arrangement according to claim 1, characterized in that the isolation transformer (6) is arranged between the power line of the wave recording device (5) and the public network, the power of the isolation transformer (6) meeting the requirements of the wave recording device (5).
6. The apparatus of claim 1,
the shell of the end screen adapter (1), the shielding layer of the short lead (2), the shell of the secondary voltage division box (3), the shielding layer of the signal cable (4) and the shell of the signal input port of the wave recording device (5) are mutually and tightly connected, the same ground potential is kept, and meanwhile, the end screen adapter is completely wrapped on a metal body which is used for transmitting voltage signals inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122532584.5U CN217467007U (en) | 2021-10-20 | 2021-10-20 | High-tension bushing end screen voltage signal acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122532584.5U CN217467007U (en) | 2021-10-20 | 2021-10-20 | High-tension bushing end screen voltage signal acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217467007U true CN217467007U (en) | 2022-09-20 |
Family
ID=83233649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122532584.5U Active CN217467007U (en) | 2021-10-20 | 2021-10-20 | High-tension bushing end screen voltage signal acquisition device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217467007U (en) |
-
2021
- 2021-10-20 CN CN202122532584.5U patent/CN217467007U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209231424U (en) | The device of electromagnetic compatibility testing is carried out to the parts to be tested | |
| CN101122619A (en) | Flexible rogowski coil for impulse current measurement | |
| AU2014393708A1 (en) | A partial discharge acquisition system comprising a capacitive coupling electric field sensor | |
| CN201489038U (en) | Flexible Roche coil for measuring impulse current | |
| EP0690625A1 (en) | Circuit for broadband video transmission over unshielded twisted wire pairs | |
| CN201820625U (en) | Electronic voltage transformer | |
| CN207636199U (en) | The sheath assembly and temperature measurement system of temperature change for sensing end | |
| CN204331002U (en) | A kind of magnetic field measuring device | |
| CN105116262A (en) | Cable shield test system and method | |
| US10942201B2 (en) | Current detector and current meter | |
| CN217467007U (en) | High-tension bushing end screen voltage signal acquisition device | |
| CN203629740U (en) | Pressure transmitter | |
| CN204649952U (en) | Based on the bushing shell for transformer monitoring device detection platform of synchro measure | |
| CN208044003U (en) | The partial discharge of transformer on-line detecting system judged based on polarity | |
| CN207352990U (en) | 6A classes 4 are to 24 line gauge unshielded twisted pairs | |
| CN102565487A (en) | Electronic type voltage transformer | |
| CN109975674A (en) | A kind of intermediate joint of electric cable state of insulation on-line measuring device | |
| GB2243038A (en) | Balance unbalance interface | |
| CN201813029U (en) | Module electric connector | |
| CN102636703A (en) | System for measuring common mode radiation | |
| CN210465583U (en) | Sensor for submarine cable fault monitoring | |
| CN208739307U (en) | Video signal transmission system, transmitting terminal and receiving end | |
| CN102841245A (en) | Device for detecting end screen current parameter of high-voltage transformer bushing in real time, and control method for device | |
| CN106507654A (en) | A kind of anti-interference isolation and communication device for extra-high voltage equipment vibration-testing | |
| CN209675098U (en) | Electronic current mutual inductor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |