Abnormal discharge multi-terminal positioning device for distribution network overhead line

Abstract

The utility model relates to the technical field of power distribution network overhead line operation state monitoring, in particular to an abnormal discharge multi-terminal positioning device for a power distribution network overhead line. The abnormal discharge multi-terminal positioning device for the distribution network overhead line comprises a plurality of abnormal discharge detection modules which are used for acquiring feature information of an abnormal discharge signal and transmitting the feature information to a control module; the control module is used for receiving and transmitting the characteristic information of the abnormal discharge signal to the abnormal discharge positioning module; the abnormal discharge positioning module is used for receiving the characteristic information of the abnormal discharge signal and positioning an abnormal discharge source; the abnormal discharge detection module comprises a high-frequency current transformer and is used for collecting and transmitting abnormal discharge signals; the signal conditioning unit is used for receiving, denoising and amplifying the abnormal discharge signal and transmitting the abnormal discharge signal to the microprocessor unit; the microprocessor unit is used for receiving and extracting feature information of the de-noised and amplified abnormal discharge signals; and the GPS unit is used for determining the position information of the abnormal discharge detection module and realizing the synchronization of detection starting time.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution network overhead line operation status monitoring, in particular to an abnormal discharge multi-terminal positioning device for distribution network overhead lines. Background Art

[0002] With the continuous acceleration of urbanization, the demand for electricity in cities is increasing, and the operating load of overhead lines is increasing. Therefore, it is very important to ensure the safe and reliable operation of distribution network overhead lines.

[0003] However, due to the influence of production process, insulation degradation and other factors, various insulation defects inevitably appear in the power design of distribution network overhead lines, which eventually develop into line faults and affect the use of distribution network overhead lines. Among them, partial discharge, as a cause of insulation degradation and early characterization, is regarded as an effective parameter for insulation status assessment. In the existing partial discharge detection technology of distribution network overhead lines, the line inspection methods such as ultrasonic and infrared testing are inefficient and cannot meet the requirements of rapid positioning and maintenance of abnormal discharge sources; the existing fault indicators can only detect large fault signals, and it is difficult to detect weak abnormal discharge signals and locate abnormal discharge sources. Therefore, it is necessary to develop a multi-terminal positioning device for abnormal discharge of distribution network overhead lines that can realize rapid positioning of abnormal discharge. Utility Model Content

[0004] The utility model aims to provide an abnormal discharge multi-terminal positioning device for distribution network overhead lines to solve the problems of low efficiency in positioning abnormal discharge sources and difficulty in detecting weak abnormal discharge signals in the prior art.

[0005] In order to solve the above problems, the technical solution of the abnormal discharge multi-terminal positioning device for distribution network overhead lines of the utility model is:

[0006] A multi-terminal positioning device for abnormal discharge of distribution network overhead lines, comprising:

[0007] Abnormal discharge positioning module, control module and multiple abnormal discharge detection modules,

[0008] The multiple abnormal discharge detection modules are sequentially installed at multiple locations on the distribution network overhead line and connected to the control module, and are used to simultaneously obtain characteristic information of the abnormal discharge signal and transmit the characteristic information of the abnormal discharge signal to the control module;

[0009] The control module is connected to the abnormal discharge detection module and the abnormal discharge positioning module, and is used to control the multiple abnormal discharge detection modules to simultaneously obtain characteristic information of abnormal discharge signals, and receive and transmit the characteristic information of abnormal discharge signals to the abnormal discharge positioning module;

[0010] The abnormal discharge positioning module is connected to the control module and is used to receive characteristic information of the abnormal discharge signal and locate the abnormal discharge source according to the characteristic information of the abnormal discharge signal;

[0011] The abnormal discharge detection module includes a high-frequency current transformer, a signal conditioning unit, a microprocessor unit and a GPS unit.

[0012] The high-frequency current transformer is connected to the signal conditioning unit and is used to collect abnormal discharge signals generated in the overhead line of the distribution network and transmit the abnormal discharge signals to the signal conditioning unit;

[0013] The signal conditioning unit is connected to the high-frequency current transformer and to the microprocessor unit, and is used to receive, denoise and amplify the abnormal discharge signal, and transmit the denoised and amplified abnormal discharge signal to the microprocessor unit;

[0014] The microprocessor unit is connected to the signal conditioning unit and the control module, and is used to simultaneously receive the denoised and amplified abnormal discharge signal, extract characteristic information of the denoised and amplified abnormal discharge signal, and transmit it to the control module, wherein the characteristic information includes: arrival time, amplitude, phase and discharge repetition number of the abnormal discharge signal;

[0015] The GPS unit is connected to the microprocessor unit and is used to determine the position information of the multiple abnormal discharge detection modules and to synchronize the detection start time.

[0016] Furthermore, the abnormal discharge detection module also includes a signal transmission unit, which is connected to the signal conditioning unit and to the microprocessor unit, and is used to receive the denoised and amplified abnormal discharge signal, and transmit the denoised and amplified abnormal discharge signal to the microprocessor unit.

[0017] Furthermore, the abnormal discharge detection module also includes a wireless communication unit, and the microprocessor unit and the control module exchange data via the wireless communication unit.

[0018] Furthermore, the control module includes a collection instruction sending unit, which is used to send collection instructions; the microprocessor unit receives the collection instruction and enters the denoised and amplified abnormal discharge signal receiving stage, and after the reception is completed, the collected denoised and amplified abnormal discharge signal is transmitted back to the control module.

[0019] Furthermore, the abnormal discharge detection module also includes a power supply unit, which is respectively connected to the signal conditioning unit, the signal transmission unit, the microprocessor unit and the wireless communication unit for realizing power supply.

[0020] Furthermore, the high-frequency current transformer includes a coupling unit and an integration circuit connected thereto, the coupling unit is used to collect abnormal discharge signals generated in the overhead line of the distribution network, and the integration circuit is used to output the abnormal discharge signals.

[0021] Furthermore, the coupling unit includes a semicircular structure and a transmission coil, the transmission coil is wound on the semicircular structure, and the integration circuit is connected to two ends of the transmission coil.

[0022] Furthermore, the output end of the high-frequency current transformer is connected to the input end of the signal conditioning unit through a coaxial cable.

[0023] Furthermore, the signal transmission unit is a single-channel signal transmission unit, and the output end of the signal conditioning unit is connected to the input end of the signal transmission unit via a coaxial cable.

[0024] Furthermore, the multiple abnormal discharge detection modules are configured with insulating wire hanging rods in a one-to-one correspondence, and the abnormal discharge detection modules are installed on the upper ends of the insulating wire hanging rods and are installed on the distribution network overhead lines through the insulating wire hanging rods.

[0025] Compared with the prior art, the multi-terminal positioning device for abnormal discharge of distribution network overhead lines of the present application determines the position information of multiple abnormal discharge detection modules through the GPS units in multiple abnormal discharge detection modules, and realizes the synchronization of the start time of the acquisition signal in the abnormal discharge detection module; uses a high-frequency current transformer to collect the abnormal discharge signal generated in the distribution network overhead line; uses a signal conditioning unit to denoise and amplify the abnormal discharge signal, improves the anti-interference ability of the abnormal discharge signal reception and the accuracy of the abnormal discharge signal; receives the denoised and amplified abnormal discharge signal through the microprocessor unit at the same time, extracts the characteristic information of the denoised and amplified abnormal discharge signal and then transmits it to the control module, and then transmits it to the abnormal discharge positioning module for positioning the abnormal discharge source, realizes multi-terminal positioning of abnormal discharge, improves the positioning efficiency and positioning accuracy of the abnormal discharge source, and can realize accurate positioning under weak abnormal discharge signals. Compared with the existing line inspection method, the device realizes the rapid positioning of the abnormal discharge source of the distribution network overhead line body and the equipment along the line, significantly reduces the time and labor cost required for the abnormal discharge signal investigation, and has important engineering practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an abnormal discharge multi-terminal positioning device for distribution network overhead lines according to an embodiment of the utility model;

[0027] Figure 2 It is a structural schematic diagram of an abnormal discharge detection module in a multi-terminal positioning device for abnormal discharge of a distribution network overhead line according to an embodiment of the utility model;

[0028] Figure 3 It is a structural schematic diagram of a high-frequency current transformer in an abnormal discharge detection module in a multi-terminal positioning device for abnormal discharge of a distribution network overhead line according to an embodiment of the utility model.

[0029] In the figure, 1. abnormal discharge detection module, 11. power supply unit, 12. high frequency current transformer, 121. coupling unit, 122. integration circuit, 13. signal conditioning unit, 14. signal transmission unit, 15. microprocessor unit, 16. wireless communication unit, 17. GPS unit, 2. insulated hanging pole, 3. discharge locator, 4. computer, 5. distribution network overhead line. DETAILED DESCRIPTION

[0030] As cited in the background art, the efficiency of locating abnormal discharge sources in the prior art is low and weak abnormal discharge signals are difficult to detect. Therefore, the utility model provides an abnormal discharge multi-terminal positioning device for distribution network overhead lines, including an abnormal discharge positioning module, a control module and multiple abnormal discharge detection modules 1, multiple abnormal discharge detection modules 1, which are sequentially installed at multiple positions on the distribution network overhead line 5 and connected to the control module, and are used to simultaneously obtain characteristic information of abnormal discharge signals, and transmit the characteristic information of abnormal discharge signals to the control module; the control module is connected to the abnormal discharge detection module 1 and to the abnormal discharge positioning module, and is used to control multiple abnormal discharge detection modules 1 to simultaneously obtain characteristic information of abnormal discharge signals, and receive and transmit the characteristic information of abnormal discharge signals to the abnormal discharge positioning module; the abnormal discharge positioning module is connected to the control module, and is used to receive the characteristic information of abnormal discharge signals, and locate the abnormal discharge source according to the characteristic information of abnormal discharge signals; wherein the abnormal discharge detection module 1 includes a high-frequency current transformer 12, a signal conditioning unit 13, a microprocessor unit 15 and a GPS unit 17, and the high-frequency current transformer 12 is connected to the signal conditioning unit 13, and is used to collect characteristic information of abnormal discharge signals in the distribution network overhead line 5. The abnormal discharge signal generated is transmitted to the signal conditioning unit 13 to realize uninterrupted collection of abnormal discharge signals; the signal conditioning unit 13 is connected to the high-frequency current transformer 12 and to the microprocessor unit 15, and is used to receive, denoise and amplify the abnormal discharge signal, and transmit the denoised and amplified abnormal discharge signal to the microprocessor unit 15, so as to improve the anti-interference ability of abnormal discharge signal reception and the accuracy of abnormal discharge signal; the microprocessor unit 15 is connected to the signal conditioning unit 13 and to the control module, and is used to simultaneously receive the denoised and amplified abnormal discharge signal, and extract the characteristic information of the denoised and amplified abnormal discharge signal, and transmit it to the control module, wherein the characteristic information includes: the arrival time, amplitude, phase and discharge repetition number of the abnormal discharge signal, so as to realize the processing of the abnormal discharge signal in the abnormal discharge detection module 1 and improve the positioning efficiency; the GPS unit 17 is connected to the microprocessor unit 15, and is used to determine the position information between multiple abnormal discharge detection modules 1 and realize the synchronization of the detection start time, so as to ensure the positioning accuracy of the abnormal discharge source. The abnormal discharge multi-terminal positioning device for distribution network overhead lines of the present application can improve the positioning efficiency and positioning accuracy of abnormal discharge sources, and can achieve accurate positioning under weak abnormal discharge signals, which significantly reduces the time and labor costs required for abnormal discharge signal troubleshooting and has important engineering practical value.

[0031] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Combine the following Figure 1 , the abnormal discharge multi-terminal positioning device for distribution network overhead lines provided in this application is described in detail. Figure 1 This is a schematic diagram of the structure of a multi-terminal positioning device for abnormal discharge of distribution network overhead lines according to an embodiment of the present application.

[0034] like Figure 1 and Figure 2 As shown, the utility model of the abnormal discharge multi-terminal positioning device for the distribution network overhead line includes: an abnormal discharge positioning module, a control module and multiple abnormal discharge detection modules 1, multiple abnormal discharge detection modules 1, which are sequentially installed at multiple positions on the distribution network overhead line 5 and connected to the control module, and are used to simultaneously obtain the characteristic information of the abnormal discharge signal and transmit the characteristic information of the abnormal discharge signal to the control module; multiple abnormal discharge detection modules 1 are configured with insulating hanging wire rods 2 in a one-to-one correspondence, and the abnormal discharge detection modules 1 are installed on the upper end of the insulating hanging wire rods 2, and are installed on the distribution network overhead line 5 through the insulating hanging wire rods 2. Here, the length of the insulating hanging wire rod 2 is 4m.

[0035] The control module is connected to the abnormal discharge detection module 1 and the abnormal discharge positioning module, and is used to control multiple abnormal discharge detection modules 1 to simultaneously obtain characteristic information of abnormal discharge signals, and receive and transmit the characteristic information of abnormal discharge signals to the abnormal discharge positioning module. Among them, the control module is a computer 4, and the abnormal discharge detection module 1 and the computer 4 are connected via a wireless network to achieve wireless transmission of the acquired characteristic information of abnormal discharge signals. Here, the control module, that is, the computer 4, is also used to control the interruption of the detection process and the display of the final positioning result.

[0036] The abnormal discharge positioning module is connected to the control module, and is used to receive the characteristic information of the abnormal discharge signal, and locate the abnormal discharge source according to the characteristic information of the abnormal discharge signal. The abnormal discharge positioning module is a discharge locator 3. When in use, after the discharge locator 3 locates the abnormal discharge source, the positioning information is transmitted to the computer 4 and displayed on the computer 4.

[0037] The abnormal discharge detection module 1 includes a high-frequency current transformer 12, a signal conditioning unit 13, a microprocessor unit 15 and a GPS unit 17. The high-frequency current transformer 12 is connected to the signal conditioning unit 13 and is used to collect abnormal discharge signals generated in the distribution network overhead line 5, that is, to collect abnormal discharge signals generated in the distribution network overhead line 5 and the equipment along the line, and transmit the abnormal discharge signals to the signal conditioning unit 13. Specifically, Figure 3 As shown, the output end of the high-frequency current transformer 12 is connected to the input end of the signal conditioning unit 13 through a coaxial cable; the bandwidth range of the high-frequency current transformer 12 is 0.1-20MHz, and the sensitivity is 5.6mV / mA. The high-frequency current transformer 12 includes a coupling unit 121 and an integration circuit 122 connected thereto, the coupling unit 121 is used to collect abnormal discharge signals generated in the distribution network overhead line 5, and the integration circuit 122 is used to output abnormal discharge signals. The coupling unit 121 includes a semicircular structure and a transmission coil, the transmission coil is wound on the semicircular structure, and the integration circuit 122 is connected to both ends of the transmission coil. Specifically: the abnormal discharge signal generated in the distribution network overhead line 5 collected by the coupling unit 121 is coupled from the distribution network overhead line 5 to the transmission coil, and transmitted to the integration circuit 122. Among them, the integration circuit 122 is composed of a capacitor C and an integration resistor R.

[0038] The signal conditioning unit 13 is connected to the high-frequency current transformer 12 and to the microprocessor unit 15, and is used to receive, denoise and amplify the abnormal discharge signal, and transmit the denoised and amplified abnormal discharge signal to the microprocessor unit 15; here, the bandwidth range of the signal conditioning unit 13 is 0.1-30MHz, and the amplification factor is 20 times.

[0039] The microprocessor unit 15 is connected to the signal conditioning unit 13 and the control module, and is used to simultaneously receive the denoised and amplified abnormal discharge signal, extract characteristic information of the denoised and amplified abnormal discharge signal, and transmit it to the control module, wherein the characteristic information includes: arrival time, amplitude, phase and number of discharge repetitions of the abnormal discharge signal.

[0040] The GPS unit 17 is connected to the microprocessor unit 15 and is used to determine the position information between the multiple abnormal discharge detection modules 1 and to synchronize the detection start time. Specifically, the GPS unit 17 is used to receive the Global Positioning System (GPS) signal to ensure that the start time of the detection data in all abnormal discharge detection modules 1 is the same to ensure the positioning accuracy of the abnormal discharge source. It should be noted that the detection start time refers to the time when the microprocessor unit 15 receives the de-noised and amplified abnormal discharge signal.

[0041] In this embodiment, the abnormal discharge detection module 1 further includes a signal transmission unit 14, which is connected to the signal conditioning unit 13 and the microprocessor unit 15, and is used to receive the de-noised and amplified abnormal discharge signal and transmit the de-noised and amplified abnormal discharge signal to the microprocessor unit 15, and store it in the memory area of ​​the microprocessor unit 15. Specifically, the signal transmission unit 14 is a single-channel signal transmission unit, and the output end of the signal conditioning unit 13 is connected to the input end of the signal transmission unit 14 through a coaxial cable; the sampling rate of the signal transmission unit 14 is 125MHz, and the sampling data length is 1s.

[0042] The abnormal discharge detection module 1 also includes a wireless communication unit 16, and the microprocessor unit 15 and the control module exchange data through the wireless communication unit 16. Specifically, the microprocessor unit 15 and the control module exchange data using a wireless network through the wireless communication unit 16. The control module includes an acquisition instruction sending unit, which is used to send an acquisition instruction; the microprocessor unit 15 receives the acquisition instruction and enters the denoised and amplified abnormal discharge signal receiving stage, and after the reception, the collected denoised and amplified abnormal discharge signal is transmitted back to the control module. Among them, the microprocessor unit 15 receives the acquisition instruction issued by the computer 4 and transmits the collected abnormal discharge signal to the computer 4 through the wireless communication unit 16.

[0043] The abnormal discharge detection module 1 further includes a power supply unit 11, which is respectively connected to the signal conditioning unit 13, the signal transmission unit 14, the microprocessor unit 15 and the wireless communication unit 16 for supplying power. Specifically, the power supply unit 11 is a rechargeable lithium battery with a voltage of 7.4V and a capacity of 5000mAh.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-terminal positioning device for abnormal discharge of distribution network overhead lines, characterized in that: include: An abnormal discharge positioning module, a control module and a plurality of abnormal discharge detection modules (1), The plurality of abnormal discharge detection modules (1) are sequentially installed at a plurality of positions on the distribution network overhead line (5), connected to the control module, and used to simultaneously obtain characteristic information of the abnormal discharge signal, and transmit the characteristic information of the abnormal discharge signal to the control module; The control module is connected to the abnormal discharge detection module (1) and to the abnormal discharge positioning module, and is used to control the plurality of abnormal discharge detection modules (1) to simultaneously acquire characteristic information of abnormal discharge signals, and to receive and transmit the characteristic information of abnormal discharge signals to the abnormal discharge positioning module; The abnormal discharge positioning module is connected to the control module and is used to receive characteristic information of the abnormal discharge signal and locate the abnormal discharge source according to the characteristic information of the abnormal discharge signal; The abnormal discharge detection module (1) comprises a high-frequency current transformer (12), a signal conditioning unit (13), a microprocessor unit (15) and a GPS unit (17). The high-frequency current transformer (12) is connected to the signal conditioning unit (13) and is used to collect abnormal discharge signals generated in the distribution network overhead line (5) and transmit the abnormal discharge signals to the signal conditioning unit (13); The signal conditioning unit (13) is connected to the high-frequency current transformer (12) and to the microprocessor unit (15), and is used to receive, de-noise and amplify the abnormal discharge signal, and transmit the de-noised and amplified abnormal discharge signal to the microprocessor unit (15); The microprocessor unit (15) is connected to the signal conditioning unit (13) and to the control module, and is used to simultaneously receive the de-noised and amplified abnormal discharge signal, extract characteristic information of the de-noised and amplified abnormal discharge signal, and transmit it to the control module, wherein the characteristic information includes: the arrival time, amplitude, phase and discharge repetition number of the abnormal discharge signal; The GPS unit (17) is connected to the microprocessor unit (15) and is used to determine the position information between the plurality of abnormal discharge detection modules (1) and to synchronize the detection start time.

2. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 1 is characterized in that: The abnormal discharge detection module (1) further comprises a signal transmission unit (14), the signal transmission unit (14) being connected to the signal conditioning unit (13) and to the microprocessor unit (15), and being used for receiving the de-noised and amplified abnormal discharge signal, and transmitting the de-noised and amplified abnormal discharge signal to the microprocessor unit (15).

3. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 2 is characterized in that: The abnormal discharge detection module (1) further comprises a wireless communication unit (16), and the microprocessor unit (15) and the control module perform data exchange via the wireless communication unit (16).

4. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 3 is characterized in that: The control module comprises a collection instruction sending unit, which is used to send a collection instruction; the microprocessor unit (15) receives the collection instruction and enters the de-noised and amplified abnormal discharge signal receiving stage, and after the reception is completed, transmits the collected de-noised and amplified abnormal discharge signal back to the control module.

5. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 4 is characterized in that: The abnormal discharge detection module (1) further comprises a power supply unit (11), wherein the power supply unit (11) is respectively connected to the signal conditioning unit (13), the signal transmission unit (14), the microprocessor unit (15) and the wireless communication unit (16) for supplying power.

6. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to any one of claims 1 to 5, characterized in that: The high-frequency current transformer (12) comprises a coupling unit (121) and an integration circuit (122) connected thereto, the coupling unit (121) being used to collect an abnormal discharge signal generated in a distribution network overhead line (5), and the integration circuit (122) being used to output the abnormal discharge signal.

7. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 6 is characterized in that: The coupling unit (121) comprises a semicircular structure and a transmission coil, the transmission coil is wound on the semicircular structure, and the integration circuit (122) is connected to two ends of the transmission coil.

8. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 7 is characterized in that: The output end of the high-frequency current transformer (12) is connected to the input end of the signal conditioning unit (13) via a coaxial cable.

9. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 2 is characterized in that: The signal transmission unit (14) is a single-channel signal transmission unit, and the output end of the signal conditioning unit (13) is connected to the input end of the signal transmission unit (14) via a coaxial cable.

10. The abnormal discharge multi-terminal positioning device for distribution network overhead lines according to claim 1, characterized in that: The plurality of abnormal discharge detection modules (1) are configured one-to-one with an insulating wire hanging rod (2); the abnormal discharge detection module (1) is mounted on the upper end of the insulating wire hanging rod (2) and is mounted on the distribution network overhead line (5) via the insulating wire hanging rod (2).

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