CN215415720U - Live detection device for partial discharge of medium-voltage cable - Google Patents
Live detection device for partial discharge of medium-voltage cable Download PDFInfo
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- CN215415720U CN215415720U CN202121466681.2U CN202121466681U CN215415720U CN 215415720 U CN215415720 U CN 215415720U CN 202121466681 U CN202121466681 U CN 202121466681U CN 215415720 U CN215415720 U CN 215415720U
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Abstract
The utility model provides a medium-voltage cable partial discharge live detection device which comprises a data processing terminal and a data acquisition terminal, wherein the data acquisition terminal comprises a plurality of data acquisition modules, a phase synchronization module, a CPU, a signal preprocessing module, a signal acquisition unit and a communication module, the output end of the data acquisition module is electrically connected with the input end of the signal preprocessing module, the output end of the signal preprocessing module is electrically connected with the input end of the signal acquisition unit, the output end of the signal acquisition unit is electrically connected with the CPU, the communication module is used for realizing data interaction between the CPU and the data processing terminal, at least one of the data acquisition modules is used for detecting the partial discharge of a power cable through high-frequency current, and the phase synchronization module is used for connecting an external phase synchronization device and transmitting a synchronization signal to the CPU. The device can improve live detection effectiveness and reduce data copying workload.
Description
Technical Field
The utility model relates to the technical field of partial discharge detection devices, in particular to a medium-voltage cable partial discharge live detection device.
Background
The power cable can effectively save line corridors and reduce the influence on the urban environment, and is widely used in urban 10kV distribution networks. Statistics on cable failures indicate that cable joint failures are the most prominent cause of cable failures. The cable joint often leads to the joint of installation to have the defect because of the construction process problem in the installation, and the defect cable joint after putting into operation, because of defect position electric field concentration, the partial discharge (partial discharge) takes place easily and leads to the joint to puncture at last. Therefore, in the distribution network cable maintenance, the partial discharge is detected in time, and the cable state is analyzed and judged according to the partial discharge development condition, so that the method becomes a feasible effective method for improving the operation reliability of the distribution network cable. The existing electrified detection device for detecting partial discharge is low in sampling rate, limited in calculation performance, high in requirement on professional personnel and prone to generating misjudgment due to the fact that detection results need to be judged manually, most of the existing devices adopt a single-machine operation mode, detection data are stored locally, manual copying of the data is needed after detection is completed, or the data are imported into a computer through a USB (universal serial bus) flash disk and an SD (secure digital) card so as to generate reports, and the effectiveness is poor.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is directed to a device for detecting partial discharge electrification of a medium voltage cable, which overcomes or at least partially solves the above-mentioned problems of the prior art.
The technical scheme provided by the utility model is as follows:
the utility model provides a live detection device of medium voltage cable partial discharge, includes data processing terminal and data acquisition terminal, the data acquisition terminal includes a plurality of data acquisition module, phase synchronization module, CPU, signal preprocessing module, signal acquisition unit and communication module, the output of data acquisition module is connected with signal preprocessing module's input electricity, signal preprocessing module's output is connected with signal acquisition unit's input electricity, signal acquisition unit's output is connected with the CPU electricity, communication module is used for realizing the data interaction between CPU and the data processing terminal, at least one is used for through high frequency current detection electric power cable partial discharge among a plurality of data acquisition module, phase synchronization module is used for connecting outside phase synchronization device, with synchronizing signal transmission to CPU.
Furthermore, one of the data acquisition modules is a high-frequency current sensor and is used for acquiring partial discharge signals, and the rest data acquisition modules are reserved interfaces.
Furthermore, the signal preprocessing module comprises a filter and an amplifying circuit, and the data acquisition module, the filter, the amplifying circuit and the signal acquisition unit are connected in sequence.
Furthermore, the signal acquisition unit comprises an analog-to-digital conversion module and a data acquisition card, wherein the input end of the analog-to-digital conversion module is in signal connection with the output end of the signal preprocessing module, the output end of the analog-to-digital conversion module is in signal connection with the input end of the data acquisition card, and the output end of the data acquisition card is in signal connection with the CPU.
Furthermore, the data acquisition terminal also comprises a power management module, wherein the power management module comprises an AC/DC conversion module, a charge and discharge management module and an electric storage module which are sequentially connected, the input end of the AC/DC conversion module is electrically connected with the mains supply, and the output end of the AC/DC conversion module is electrically connected with the CPU.
Further, the data processing terminal is one of a notebook computer, a tablet computer or a desktop computer.
Further, the external phase synchronization device is a signal generator or a rogowski coil.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a medium-voltage cable partial discharge live detection device which is provided with a plurality of data acquisition modules and can support a plurality of partial discharge detection types.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a schematic view of an overall structure of a partial discharge live detection device for a medium-voltage cable according to an embodiment of the present invention.
In the figure, 1, 2, 1, 201, 202, 203, CPU, 204, 205, 206, communication module, 207, power management module.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, the illustrated embodiments are provided to illustrate the utility model and not to limit the scope of the utility model.
Referring to fig. 1, the present embodiment provides a medium voltage cable partial discharge live detection apparatus, which includes a data processing terminal 1 and a data acquisition terminal 2. The data acquisition terminal 2 comprises a plurality of data acquisition modules 201, a phase synchronization module 202, a CPU203, a signal preprocessing module 204, a signal acquisition unit 205 and a communication module 206, wherein an output end of the data acquisition module 201 is electrically connected with an input end of the signal preprocessing module 204, an output end of the signal preprocessing module 204 is electrically connected with an input end of the signal acquisition unit 205, an output end of the signal acquisition unit is electrically connected with the CPU203, the communication module 206 is used for realizing data interaction between the CPU and the data processing terminal, at least one of the data acquisition modules 201 is used for detecting partial discharge of a power cable through high-frequency current, and the phase synchronization module 202 is used for connecting an external phase synchronization device and transmitting a synchronization signal to the CPU.
Specifically, one of the data acquisition modules 201 is a high-frequency current sensor, and the high-frequency current sensor detects the partial discharge of the power cable by using a high-frequency current partial discharge detection technology, and has the principle that a high-frequency pulse current is generated at the moment when the partial discharge occurs in the cable connector, and the pulse current is transmitted to the far distance along the cable body in the form of a guided wave and enters the ground through a ground wire of an intermediate connector or a terminal connector, so that the high-frequency current sensor can be coupled to the cable partial discharge pulse current by mounting the high-frequency current sensor on the ground wire of the cable body, the intermediate connector or the terminal connector. The high-frequency current sensor is arranged on a grounding wire of the distribution cable terminal and is responsible for collecting partial discharge signals. The remaining data acquisition modules 201 are reserved interfaces, and other detection types can be expanded.
The phase synchronization module 202 provides a voltage phase for the detection signal by connecting to an external phase synchronization device, and provides a basis for subsequent phase analysis. The phase synchronization module 202 has two phase synchronization methods: inner sync and outer sync. The internal synchronization is specifically that after the device is switched on with an alternating current power supply, the power supply phase is directly adopted. The external synchronization refers to an external 0-9V input signal, the external phase synchronization device can be a signal generator or a Rogowski coil, and when the external phase synchronization device is the signal generator, a sine wave or square wave signal output by the signal generator is collected; when the external phase synchronization device is a Rogowski coil, the output signal of the Rogowski coil directly coiled on the cable can be acquired. The phase synchronization module 202 transmits the synchronization signal to the CPU203 through the BNC line, and the selection of the synchronization signal is determined by the CPU 203. In some embodiments, the phase synchronization module 202 may be of the PH-1000 type.
The CPU203 is responsible for managing phase information of the data acquisition terminal, information of the signal acquisition unit 205, selecting a phase synchronization signal, and transmitting related data of the data acquisition terminal 2 to the data processing terminal 1 through the communication module 206. The CPU203 may be of a commercially available and well-known type.
The signal preprocessing module 204 includes a filter and an amplifying circuit, and the data acquisition module 201, the filter, the amplifying circuit, and the signal acquisition unit are connected in sequence. The signal preprocessing module 204 is mainly used for filtering and amplifying signals output by the data acquisition module 201, various noise and interference signals exist in the signals acquired by the data acquisition module 201, the signals need to be matched with a hardware filter for filtering, the signal amplitude after filtering has a certain degree of attenuation, and the signals need to be amplified by a broadband amplifier, so that the purpose of improving the signal-to-noise ratio of the partial discharge signals is achieved. The filter can adopt a known model on the market; the amplifying circuit may employ a conventional amplifying circuit well known to those skilled in the art.
The signal acquisition unit 205 includes an analog-to-digital conversion module and a data acquisition card, the input end of the analog-to-digital conversion module is in signal connection with the output end of the signal preprocessing module, the output end of the analog-to-digital conversion module is in signal connection with the input end of the data acquisition card, the output end of the data acquisition card is in signal connection with the CPU, the analog-to-digital conversion module converts the actually acquired analog signals into digital signals for further processing, and the data acquisition card is responsible for acquiring the digital signals for subsequent analysis. The analog-to-digital conversion module and the data acquisition card can adopt the known models in the market.
The communication module 206 is used for realizing data interaction between the data acquisition terminal 2 and the data processing terminal 1, and the communication module 206 may be directly connected by a USB3.0 line, may also be connected by a USB 3.0-to-RJ 45 ethernet interface, and may also be connected by a USB 3.0-to-fiber ethernet interface.
The data processing terminal 1 is one of a notebook computer, a tablet computer or a desktop computer, and is used for controlling the data acquisition terminal 2 to acquire data and collect and edge-calculate the data acquired by the data acquisition terminal 2, deeply analyzing the data by running a built-in existing software as a support, automatically diagnosing results, generating a detection report by the existing software, and uploading the data to the background server in response to the requirement of the background server. The existing software can adopt a PDC-3000 type cable high-frequency current partial discharge cloud detection system.
In addition, the data acquisition terminal 2 further comprises a power management module 207, the power management module 207 comprises an AC/DC conversion module, a charging and discharging management module and an electric storage module which are sequentially connected, the input end of the AC/DC conversion module is electrically connected with the mains supply, and the output end of the AC/DC conversion module is electrically connected with the CPU. The AC/DC conversion module is used for converting commercial power into direct current required by the device, the charge and discharge management module is used for realizing charge and discharge management, when an external power supply is input, the external power supply is automatically switched to supply power, otherwise, the power is supplied through the power storage module, and the power storage module adopts a high-capacity rechargeable lithium battery. The charge and discharge management module can adopt the existing charge and discharge management chip on the market.
When the device is used, a high-frequency current sensor in the data acquisition module 201 is installed firstly, the phase synchronization type is determined, the self-synchronization type does not need to be connected with alternating current, an internal power supply is adopted, the internal synchronization type needs to be connected with the alternating current, the external synchronization type needs to be connected with a signal generator or a Rogowski coil, and a user can select the phase synchronization type according to actual conditions. The data acquisition module 201 finishes data acquisition, and transmits the data to the CPU203 after being processed by the signal preprocessing module 204 and the signal acquisition unit 205, the CPU203 sends the data to the data processing terminal 1 through the communication module 206, and existing software built in the data processing terminal 1 performs feature extraction and result diagnosis on the acquired data, and finally generates a detection report.
Compared with the prior art, the device can be provided with a sampling card with a high sampling rate, the higher the sampling rate is, the higher the high-frequency component of the partial discharge signal can be restored, and meanwhile, a plurality of reserved interfaces are arranged, so that the partial discharge detection types such as ultrasonic waves, ground electric waves and the like can be expanded. The device can select a phase synchronization mode according to an actual scene, so that the detection requirements of different scenes are met. The device is connected data acquisition terminal 2 and data processing terminal 1, carries out data analysis through data processing terminal 1, compares with traditional mode, and data processing terminal 1 can adopt panel computer, desktop or notebook as the carrier, and the operating performance is better, can carry out complicated calculation, improves the analysis accuracy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A medium voltage cable partial discharge live detection device is characterized by comprising a data processing terminal and a data acquisition terminal, the data acquisition terminal comprises a plurality of data acquisition modules, a phase synchronization module, a CPU, a signal preprocessing module, a signal acquisition unit and a communication module, the output end of the data acquisition module is electrically connected with the input end of the signal preprocessing module, the output end of the signal preprocessing module is electrically connected with the input end of the signal acquisition unit, the output end of the signal acquisition unit is electrically connected with the CPU, the communication module is used for realizing data interaction between the CPU and the data processing terminal, at least one of the data acquisition modules is used for detecting the partial discharge of the power cable through high-frequency current, the phase synchronization module is used for connecting an external phase synchronization device and transmitting a synchronization signal to the CPU.
2. The apparatus according to claim 1, wherein one of the data acquisition modules is a high frequency current sensor for acquiring partial discharge signals, and the remaining data acquisition modules are reserved interfaces.
3. The apparatus according to claim 1, wherein the signal preprocessing module comprises a filter and an amplifying circuit, and the data acquisition module, the filter, the amplifying circuit and the signal acquisition unit are connected in sequence.
4. The device according to claim 1 or 3, wherein the signal acquisition unit comprises an analog-to-digital conversion module and a data acquisition card, an input end of the analog-to-digital conversion module is connected with an output end of the signal preprocessing module in a signal manner, an output end of the analog-to-digital conversion module is connected with an input end of the data acquisition card in a signal manner, and an output end of the data acquisition card is connected with a CPU in a signal manner.
5. The live detection device of partial discharge of a medium voltage cable according to claim 1, wherein the data acquisition terminal further comprises a power management module, the power management module comprises an AC/DC conversion module, a charge and discharge management module and an electrical storage module which are connected in sequence, an input end of the AC/DC conversion module is electrically connected with a mains supply, and an output end of the AC/DC conversion module is electrically connected with the CPU.
6. The apparatus according to claim 1, wherein the data processing terminal is one of a laptop, a tablet pc and a desktop.
7. A medium voltage cable partial discharge live detection device according to claim 1, characterized in that said external phase synchronization device is a signal generator or a rogowski coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121466681.2U CN215415720U (en) | 2021-06-29 | 2021-06-29 | Live detection device for partial discharge of medium-voltage cable |
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| CN202121466681.2U CN215415720U (en) | 2021-06-29 | 2021-06-29 | Live detection device for partial discharge of medium-voltage cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115480133A (en) * | 2022-08-04 | 2022-12-16 | 国网河北省电力有限公司保定供电分公司 | Cable partial discharge detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115480133A (en) * | 2022-08-04 | 2022-12-16 | 国网河北省电力有限公司保定供电分公司 | Cable partial discharge detection device |
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