CN217717907U - Single-interval type high-precision current monitoring device for ring main unit - Google Patents
Single-interval type high-precision current monitoring device for ring main unit Download PDFInfo
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- CN217717907U CN217717907U CN202221729343.8U CN202221729343U CN217717907U CN 217717907 U CN217717907 U CN 217717907U CN 202221729343 U CN202221729343 U CN 202221729343U CN 217717907 U CN217717907 U CN 217717907U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 31
- 230000005611 electricity Effects 0.000 claims abstract description 12
- 230000006698 induction Effects 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims description 28
- 238000005070 sampling Methods 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Abstract
The utility model relates to a single interval formula high accuracy current monitoring devices for looped netowrk cabinet, including the device body, this internal circuit assembly that is provided with of device, the device body is provided with a plurality of waterproof end caps that are used for the external connection cable waterproof, be connected with on the waterproof end cap and measure rogowski coil, a current for to cable run measures, still be connected with on the waterproof end cap and measure waterproof joint, get electric CT waterproof joint, antenna waterproof joint, be connected with on measuring waterproof joint and measure rogowski coil, it gets electric CT subassembly to be connected with on the electric CT waterproof joint, get the electricity through the current induction and supply power for the device body, be connected with the antenna module on the waterproof joint of antenna. From this, adopt the design that integrates, miniaturize, can install in the narrow and small space of single interval in the looped netowrk cabinet, need not in addition the vertical screen cabinet. The automatic power supply can be realized, an external power supply is not needed, and the automatic power supply can work for more than 24 hours in a power failure state by matching with a rechargeable battery.
Description
Technical Field
The utility model relates to a current monitoring device especially relates to a single interval formula high accuracy current monitoring device for looped netowrk cabinet.
Background
The distribution network line comprises an overhead line and a cable line, and is multi-branch, long in line and complex in topology. Once a fault occurs, the fault must be isolated and cleared as soon as possible. At present, a monitoring device for a cable line of a ring main unit mainly comprises a cable type fault indicator and a station terminal.
The monitoring device that current looped netowrk cabinet used exists the problem:
(1) The volume is large, the screen cabinet can not be independently installed in a single interval, the screen cabinet needs to be independently installed, and the construction engineering quantity is large.
(2) The power consumption is large, the power cannot be obtained automatically, an external power supply is needed, and PT (potential transformer) needs to be independently installed in the cabinet to obtain power.
(3) The sampling frequency is too low, the sampling rate of the existing device is mostly lower than 4kHz, the frequency of the transient signal of the ground fault can reach as high as 5kHz and 4kHz, and the original undistorted transient signal can not be acquired, so the existing device can only distinguish the heavy current overcurrent fault and can not accurately distinguish the ground fault.
In order to realize wide area synchronization, sampling of the existing device is basically asynchronous, so that differential or related comparison with data of upper and lower ring main units or overhead line monitoring devices cannot be carried out, fault study and judgment cannot be carried out by using wide area data, and fault study and judgment can only be carried out by using local monitoring signals.
In view of the above-mentioned drawbacks, the present designer is actively making research and innovation to create a single-interval high-precision current monitoring device for ring main units, so that the current monitoring device has industrial utility value.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a single spaced high accuracy current monitoring device for looped netowrk cabinet.
The utility model discloses a single interval formula high accuracy current monitoring devices for looped netowrk cabinet, including the device body, wherein: this internal circuit assembly that is provided with of device, the device body is provided with a plurality of waterproof end caps that are used for the external connection cable is waterproof, be connected with on the waterproof end cap and measure waterproof joint, get electric CT waterproof joint, antenna waterproof joint, it is connected with on the waterproof joint to measure and measures the rogowski coil, it gets the electric CT subassembly to be connected with on the electric CT waterproof joint, gets the electricity through current induction and supplies power for the device body, be connected with the antenna module on the antenna waterproof joint.
Further, the single-interval high-precision current monitoring device for the ring main unit is characterized in that the antenna assembly is a 4G antenna or a GPS/Beidou antenna.
Furthermore, the single-interval high-precision current monitoring device for the ring main unit is described above, wherein the measurement rogowski coil is a three-phase split coil assembly.
Furthermore, the single-interval high-precision current monitoring device for the ring main unit is characterized in that the power taking CT assembly is a power taking clamp, one end of the power taking clamp is provided with a combination opening, and the combination opening is provided with a locking bolt in a closed state.
Further, foretell a high accuracy current monitoring devices of single interval formula for looped netowrk cabinet, wherein, the circuit assembly is including the circuit body, be provided with central processing unit on the circuit body, be connected with on the central processing unit and get the electric unit with the response that gets the electric CT subassembly and link to each other, still be connected with the multichannel sampling unit that links to each other with measuring rogowski coil on the central processing unit, be provided with high accuracy analog-to-digital conversion unit between multichannel sampling unit and the central processing unit, still be connected with the time service unit on the central processing unit, still be connected with the communication unit on the central processing unit, the communication unit links to each other with the antenna module, still be connected with data buffer unit on the central processing unit for carry out real-time buffer to the sampled data.
Furthermore, the single-interval high-precision current monitoring device for the ring main unit is characterized in that the central processing unit is further connected with a rechargeable battery unit for supplying power to the device in a power-off state, and the rechargeable battery unit is a 18650 lithium battery.
Furthermore, in the single-interval high-precision current monitoring device for the ring main unit, the central processing unit is a 32-bit low-power processor.
Furthermore, in the single-interval high-precision current monitoring device for the ring main unit, the time service unit is a GPS/beidou time service unit.
Still further, in the single-interval high-precision current monitoring device for the ring main unit, the high-precision analog-to-digital conversion unit is a 16-bit high-precision digital-to-analog chip.
Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:
1. adopt the design of integrating, miniaturizing, can install in the narrow and small space of single interval in the looped netowrk cabinet, need not to set up the screen cabinet in addition.
2. The self-powered electricity-taking device can automatically take electricity without an external power supply, and can work for more than 24 hours in a power failure state by being matched with a rechargeable battery.
3. The Rogowski coil is used for measuring CT and is conveniently arranged on a 3-phase cable line.
4. The sampling data can be stored in the memory after being marked with the accurate time tags, and sampling waveforms can be called according to the specified time tags.
5. Sampling wide area synchronization is realized through GPS/Beidou time service, and differential comparison can be performed by using synchronous sampling data in a plurality of ring main units.
6. Parameters of the device can be configured through 4G communication, and the device can be upgraded through 4G communication.
The above description is only an outline of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented in accordance with the content of the specification, the following detailed description will be given of preferred embodiments of the present invention in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a single-interval high-precision current monitoring device for a ring main unit.
Fig. 2 is a schematic diagram of a circuit assembly.
The meanings of the reference symbols in the drawings are as follows.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
A single-interval high-precision current monitoring device for a ring main unit as shown in fig. 1 to 2, which comprises a device body 1, and is characterized in that: a circuit assembly 2 is arranged in the device body 1, and the device body 1 is provided with a plurality of waterproof plugs 3 used for preventing external connecting cables from being water. In consideration of daily monitoring requirements, the waterproof plug 3 is connected with a measuring Rogowski coil 7 for measuring the current of the cable line. Meanwhile, the waterproof plug 3 is also connected with a measurement waterproof connector 4, a power acquisition CT waterproof connector 5 and an antenna waterproof connector 6. Specifically, the measuring waterproof connector 4 is connected with a measuring rogowski coil 7. The electricity taking CT waterproof connector 5 is connected with an electricity taking CT component 8 which can supply power to the device body 1 through current induction electricity taking. An antenna assembly 9 is connected to the antenna waterproof connector 6.
In view of the above, the antenna assembly 9 is a 4G antenna or a GPS/beidou antenna in consideration of the convenience of communication during use. Of course, two sets of antennas with an integrated design can also be adopted, and the two sets of antennas can be installed on the top of the ring main unit during use. Meanwhile, in order to match with the three-phase current signal application requirement and meet the filtering requirement during the subsequent detection, the adopted measuring Rogowski coil 7 is a three-phase split coil assembly. Thus, the distribution of A, B and C phases of the cable line can be corresponded.
Further, considering the convenience of taking electricity during use, the adopted electricity taking CT assembly 8 is an electricity taking clamp, one end of the electricity taking clamp is provided with a combination opening, and the combination opening is provided with a locking bolt 10 in a closed state. Thus, after the power supply device is installed in place, the locking of the combined opening can be realized through the locking bolt 10, accidental loosening can not occur, and smooth power supply is ensured. Thus, the power-taking CT component 8 obtains power from the power line induction and supplies power to the central processing unit 11 and all other circuits, and self-power supply of the device is realized.
Combine actual implementation to see, the utility model discloses a circuit assembly 2 including the circuit body, be provided with central processing unit 11 on the circuit body, be connected with on the central processing unit 11 and get the electric unit 12 of getting the response that electric CT subassembly 8 links to each other. Meanwhile, the central processing unit 11 is also connected with a multi-channel sampling unit 13 connected with the Rogowski coil 7, and a high-precision analog-to-digital conversion unit 14 is arranged between the multi-channel sampling unit 13 and the central processing unit 11, so that the real-time sampling of the power line current is realized. In addition, the central processing unit 11 is also connected with a time service unit 15, so that the time service and the sampling are synchronous. A communication unit 16 is also connected to the central processor 11, and the communication unit 16 is connected to the antenna assembly 9. Furthermore, the central processing unit 11 is further connected to a data caching unit 17 for caching the sampled data in real time, and also caching the time tag.
Still further, in consideration of the continuous operation requirement, the central processing unit 11 is also connected with a rechargeable battery unit 18 for supplying power to the device in a power-off state, and the rechargeable battery unit 18 is a 18650 lithium battery. Therefore, the power acquisition CT component 8 can be used for storing and releasing after power acquisition. Meanwhile, the adopted central processing unit 11 is a 32-bit low-power-consumption processor, and long-time data processing is met. Moreover, the time service unit 15 is a GPS/Beidou time service unit 15, so that the precision of the time tag is improved, and the accurate synchronization of the sampling data is realized. Moreover, the adopted high-precision analog-to-digital conversion unit 14 is a 16-bit high-precision digital-to-analog chip, and can meet the sampling rate of 12.8 kHz.
Can find out through foretell characters expression and combine the attached drawing, adopt the utility model discloses afterwards, possess following advantage:
1. adopt the design of integrating, miniaturizing, can install in the narrow and small space of single interval in the looped netowrk cabinet, need not to set up the screen cabinet in addition.
2. The self-powered electricity-taking device can automatically take electricity without an external power supply, and can work for more than 24 hours in a power failure state by being matched with a rechargeable battery.
3. The Rogowski coil is used for measuring CT and is conveniently arranged on a 3-phase cable circuit.
4. The sampling data can be stored in the memory after being marked with the accurate time tags, and sampling waveforms can be called according to the specified time tags.
5. The sampling wide area synchronization is realized through GPS/Beidou time service, and the synchronous sampling data in a plurality of ring main units can be used for differential comparison.
6. Parameters of the device can be configured through 4G communication, and the device can be upgraded through 4G communication.
Furthermore, the indication directions or positional relationships described in the present invention are directions or positional relationships based on the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the indicated device or structure must have a specific direction or operate in a specific directional configuration, and therefore, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly stated or limited, the terms "connected" and "disposed" are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. And it may be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A single interval formula high accuracy current monitoring device for looped netowrk cabinet, including the device body, its characterized in that: this internal circuit assembly that is provided with of device, the device body is provided with a plurality of waterproof end caps that are used for the external connection cable is waterproof, be connected with on the waterproof end cap and measure waterproof joint, get electric CT waterproof joint, antenna waterproof joint, it is connected with on the waterproof joint to measure and measures the rogowski coil, it gets the electric CT subassembly to be connected with on the electric CT waterproof joint, gets the electricity through current induction and supplies power for the device body, be connected with the antenna module on the antenna waterproof joint.
2. The single-interval high-precision current monitoring device for the ring main unit according to claim 1, wherein: the antenna component is a 4G antenna or a GPS/Beidou antenna.
3. The single-interval high-precision current monitoring device for the ring main unit according to claim 1, wherein: the measuring Rogowski coil is a three-phase split coil assembly.
4. The single-interval high-precision current monitoring device for the ring main unit according to claim 1, wherein: the power taking CT assembly is a power taking clamp, a combination opening is formed in one end of the power taking clamp, and a locking bolt is arranged in the combination opening in a closed state.
5. The single-interval high-precision current monitoring device for the ring main unit according to claim 1, wherein: the circuit assembly is including the circuit body, be provided with central processing unit on the circuit body, be connected with on the central processing unit and get the electric unit of the induction that the electric CT subassembly links to each other, still be connected with on the central processing unit and measure the multichannel sampling unit that the rogowski coil links to each other, be provided with high accuracy analog-to-digital conversion unit between multichannel sampling unit and the central processing unit, still be connected with the time service unit on the central processing unit, still be connected with the communication unit on the central processing unit, the communication unit links to each other with the antenna module, still be connected with data buffer unit on the central processing unit for carry out real-time buffer to sampled data.
6. The single-interval high-precision current monitoring device for the ring main unit according to claim 5, wherein: the central processing unit is also connected with a rechargeable battery unit which is used for supplying power to the device in a power-off state, and the rechargeable battery unit is a 18650 lithium battery.
7. The single-interval high-precision current monitoring device for the ring main unit according to claim 5, wherein: the central processing unit is a 32-bit low-power processor.
8. The single-interval high-precision current monitoring device for the ring main unit according to claim 5, wherein: the time service unit is a GPS/Beidou time service unit.
9. The single-interval high-precision current monitoring device for the ring main unit according to claim 5, wherein: the high-precision analog-to-digital conversion unit is a 16-bit high-precision digital-to-analog chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221729343.8U CN217717907U (en) | 2022-07-06 | 2022-07-06 | Single-interval type high-precision current monitoring device for ring main unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221729343.8U CN217717907U (en) | 2022-07-06 | 2022-07-06 | Single-interval type high-precision current monitoring device for ring main unit |
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| Publication Number | Publication Date |
|---|---|
| CN217717907U true CN217717907U (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221729343.8U Active CN217717907U (en) | 2022-07-06 | 2022-07-06 | Single-interval type high-precision current monitoring device for ring main unit |
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| CN (1) | CN217717907U (en) |
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2022
- 2022-07-06 CN CN202221729343.8U patent/CN217717907U/en active Active
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