CN220120923U - Fault location data detection device for power distribution network - Google Patents
Fault location data detection device for power distribution network Download PDFInfo
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- CN220120923U CN220120923U CN202321602116.3U CN202321602116U CN220120923U CN 220120923 U CN220120923 U CN 220120923U CN 202321602116 U CN202321602116 U CN 202321602116U CN 220120923 U CN220120923 U CN 220120923U
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Abstract
The utility model discloses a power distribution network fault location data detection device, which is arranged on a power distribution network trunk line and each branch line and is in wireless communication connection with a communication base station, wherein the communication base station is in wireless communication connection with a server of a master station; the fault positioning data detection device of the power distribution network comprises a shell, wherein a traveling wave transformer, a current transformer, a traveling wave signal processing module, a current signal processing module, a time setting module, a microprocessor MCU, a remote communication module, a large-capacity data storage module, a power module, a digital-to-analog converter and a crystal oscillator module are arranged in the shell; the power distribution network fault accurate positioning device can detect phase currents and current traveling waves of each phase on a power distribution network main line and each branch line, provide data such as the current of each phase and the current traveling waves of each phase for fault accurate positioning, and therefore the power distribution network fault accurate positioning device is matched with a main station to realize accurate positioning of faults.
Description
Technical Field
The utility model relates to fault location of a power distribution network, in particular to a fault location data detection device of the power distribution network.
Background
The distribution line is long, the point is many, the face is wide, the passageway is complicated, trouble and its reason are complicated various, and the circuit branch is many in addition, and fault transition resistance is big, and the fault signal is difficult to effectively detect. Various fault positioning methods such as fault indicators and distribution automatic switches commonly used for distribution lines have obvious defects, and the practicability is not ideal; and both devices can only be used for section positioning, and cannot be used for fault accurate positioning. Therefore, after determining the fault line, the fault point can be found only by a manual blind line inspection mode, a large amount of manpower, time and material resources are required to be input, and the frequent misoperation of the fault alarm starting element is unreasonable, the electric field abrupt starting mode is easily interfered by external factors, and the frequent misoperation of the phase current disturbance mode is easily influenced by load fluctuation and the like.
Aiming at the problems of complex fault positioning method, high difficulty, low efficiency and the like in the prior art, the problems can be solved by a traveling wave panoramic multidimensional positioning algorithm, which is an algorithm for fault positioning and can realize accurate positioning of equipment fault positions. The algorithm utilizes the propagation characteristics of traveling wave signals in the wires and combines multidimensional information such as voltage, current, frequency and other parameters to perform fault location. The algorithm has the advantages of high positioning precision, wide application range, strong real-time performance and the like, and is widely applied to industries such as power systems, communication systems and the like.
However, if the traveling wave panoramic multidimensional positioning algorithm is used, all phase currents and all phase current traveling waves on the main line and all branch lines of the power distribution network are required to be detected, so that accurate fault positioning is realized.
Disclosure of Invention
In order to solve the problems, the utility model provides a power distribution network fault location data detection device which can detect phase currents and current traveling waves of each phase on a power distribution network trunk line and each branch line and provide data for fault accurate location.
The utility model adopts the technical scheme that:
the power distribution network fault location data detection device is arranged on a power distribution network trunk line and each branch line, and is in wireless communication connection with a communication base station, and the communication base station is in wireless communication connection with a server of a master station; the fault positioning data detection device of the power distribution network comprises a shell, wherein a traveling wave transformer, a current transformer, a traveling wave signal processing module, a current signal processing module, a time setting module, a microprocessor MCU, a remote communication module, a large-capacity data storage module, a power module, a digital-to-analog converter and a crystal oscillator module are arranged in the shell;
the power supply module is respectively connected with each module, the current transformer is connected with the current signal processing module, and the current signal processing module is connected with the microprocessor MCU; the traveling wave transformer is connected with the traveling wave signal processing module, and the traveling wave signal processing module is connected with the microprocessor MCU; the microprocessor MCU is connected with the time setting module, the large-capacity data storage module, the remote communication module, the crystal oscillator module and the digital-to-analog converter, and the digital-to-analog converter is connected with the crystal oscillator module.
Further, the shell comprises an upper shell and a lower shell, wherein the upper shell and the lower shell are connected in a buckling mode and can clamp a cable after being fixed through a screw; the upper shell and the lower shell are provided with through holes for the matched cables to pass through, cavities are formed in the upper shell and the lower shell, a circuit board is arranged in the cavities, and each module is arranged on the circuit board.
Further, the power supply module comprises a power supply management module, a coupling induction power taking module, a photovoltaic power taking module and a backup battery power taking module, wherein the coupling induction power taking module, the photovoltaic power taking module and the backup battery power taking module are connected with the power supply management module; the coupling induction power taking module is arranged on a cable of a main line and each branch line of the power distribution network and can take power from the power distribution line in an induction way; the photovoltaic power taking module can be connected with a photovoltaic panel installed outside.
Further, the microprocessor MCU adopts stm32 singlechip.
Further, the traveling wave transformer adopts a rogowski coil transformer.
Further, the traveling wave signal processing module comprises a filter and a comparator; the filter is respectively connected with the traveling wave transformer and the comparator, and the comparator is connected with the I/O port of the microprocessor MCU.
Further, a power switch and an indicator lamp are further arranged on the shell, and the power switch and the indicator lamp are respectively connected with the microprocessor MCU.
The beneficial effects of the utility model are as follows:
the power distribution network fault accurate positioning device can detect phase currents and current traveling waves of each phase on a power distribution network main line and each branch line, and provides phase current and current traveling wave data of each phase for fault accurate positioning; the power distribution network fault accurate positioning device is arranged on the power distribution network main line and each branch line, so that the power distribution network fault accurate positioning device can be matched with the main station to perform power distribution network fault accurate positioning.
According to the power distribution network fault accurate positioning device, traveling wave recording and sampling support is cached for 1 hour, repeated periodic traveling wave discharge data can be cached, so that a main station can analyze the periodic characteristics of hidden danger traveling waves, and hidden danger faults can be early warned; the accurate positioning device for the faults of the power distribution network adopts high-frequency traveling wave to trigger fault signals, is not influenced by a neutral point grounding mode, a power supply, a system size and the like, solves the problems that the characteristics of the faults of the power distribution network are weak, the faults are difficult to trigger effectively to alarm, and the false alarm and the missing alarm are solved; the fault characteristics effectively utilize the cooperation of high-frequency fault characteristics and multi-terminal multi-points, and the problem of accurate positioning of the faults of the power distribution network can be effectively solved.
Drawings
FIG. 1 is a schematic view of the installation location of the present utility model;
FIG. 2 is a schematic diagram of the connection of the present utility model to a cable;
FIG. 3 is a schematic view of the bottom structure of the present utility model;
FIG. 4 is a schematic view of the internal structure of the present utility model;
FIG. 5 is a schematic diagram of an internal trigger architecture of the present utility model;
in the figure, 1-distribution network fault location data detection device, 2-base station, 3-master station, 4-server, 5-upper shell, 6-lower shell, 7-screw one, 8-screw two, 9-cable, 10-photovoltaic panel, 11-switch, 12-pilot lamp.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
In order to detect phase currents and traveling waves of each phase on a main line and branch lines of a power distribution network, data such as the phase currents and the traveling waves of each phase are provided for a main station, so that the main station can accurately locate faults.
As shown in fig. 1, the fault location data detection device 1 for a power distribution network in this embodiment is installed on a 10KV power distribution network main line and each branch line, 3 fault location data detection devices 1 for the power distribution network are installed at each location, the 3 fault location data detection devices 1 for the power distribution network correspond to a phase a, a phase B and a phase C of each branch line, each fault location data detection device 1 for the power distribution network utilizes a time synchronization module in the device to realize accurate synchronization of sampling data inside each point device, phase current and current travelling waves are detected through a current transformer and a travelling wave signal processing module, the detected data are transmitted to the master station 3 through a server 4 of the base station 2 and the master station 3 after being processed, and the master station 3 adopts fault travelling wave data of each point device to realize accurate location of faults.
As shown in fig. 2 and 3, the fault location data detection device 1 for power distribution network is completely insulated from a cable 9 of a power distribution line, the fault location data detection device 1 for power distribution network is in a shell structure, and the shell comprises an upper shell 5 and a lower shell 6, wherein the upper shell 5 and the lower shell 6 are connected in a buckled mode. The shell and the lower shell 6 are provided with through holes through which the matched cables 9 pass, the bottom of the lower shell 6 is provided with a first screw rod 7 and a second screw rod 8, the upper shell 5 and the lower shell 6 are relatively fixed by rotating the first screw rod 7 and the second screw rod 8, and the cables 9 can be clamped. The upper shell 5 and the lower shell 6 are internally provided with a cavity, and a circuit board is arranged in the cavity, wherein a traveling wave transformer, a current transformer, a traveling wave signal processing module, a current signal processing module, a time setting module, a microprocessor MCU, a remote communication module, a large-capacity data storage module, a power module, a digital-to-analog converter, a crystal oscillator module and the like are all arranged on the circuit board. In order to carry out switch control and look over operating condition to this distribution network fault location data detection device 1, still be equipped with switch 11 and pilot lamp 12 on the casing, switch 11 and pilot lamp 12 are connected with microprocessor MCU respectively, and switch 11 is used for controlling equipment power break-make, and pilot lamp 12 is used for verifying equipment switch-on state.
As shown in fig. 4, the connection mode and the working principle of each module inside the power distribution network fault location data detection device 1 are as follows:
the power module is connected with each module respectively and is used for supplying power to each module. The power module in the embodiment comprises a power management module, a coupling induction power taking module, a photovoltaic power taking module and a backup battery power taking module, wherein the coupling induction power taking module, the photovoltaic power taking module and the backup battery power taking module are connected with the power management module; the coupling induction power taking module can adopt a trade-off electronic EPCOS/TDK coupling inductor or other brands of products of the same type, and is arranged on a cable 9 of a main line and each branch line of the distribution network, and can take power from the distribution line in an induction way; as shown in fig. 1, the photovoltaic power taking module can be connected with a photovoltaic panel 10 installed outside, the photovoltaic power taking module and the photovoltaic panel 10 can adopt Jiang Ke energy JK-H20S60 type matching products or other brands of same type products, and the photovoltaic panel 10 takes power from solar energy; the backup battery power taking module can adopt a deep PAS1000-220S48-D type AC-DC power module or other brands and products of the same type; the power management module can adopt Siemens s7-1500PLC power management module or other products of the same type, and is used for managing induction power taking, solar power taking and backup battery power taking from a distribution line and supplying power to the processor and other circuits.
The current transformer is arranged on the cable 9 of the distribution line in the shell, and the current transformer can be Siemens 3UF18683GA00 series current transformers, and the current transformer is used for sampling the phase current of the cable 9 of the distribution line in real time. The current transformer is connected with the current signal processing module which is connected with the microprocessor MCU; the sampling data of the phase current is transmitted to a current signal processing module, the current signal processing module can adopt a Siemens 3UF18683GA00 series current transformer current signal processing module or other brands of products with the same type, the current signal processing module has the functions of filtering, amplifying and A/D conversion, the noise and interference can be removed from the sampling data of the phase current, the signal can be amplified to a proper range, so that the A/D converter can sample and process the sampling data, and the sampling data is converted into a digital signal and then transmitted to a microprocessor MCU.
The traveling wave transformer is installed on the cable 9 of the distribution line in the shell, and the traveling wave transformer adopts a rogowski coil transformer, for example: the German GMCI high-beauty measuring instrument Micro ACP 300 Rogowski coil transformer or other products of the same type, and the traveling wave transformer has the function of sampling real-time data of the current traveling wave of the cable 9 of the distribution line. The traveling wave transformer is connected with the traveling wave signal processing module, and the traveling wave signal processing module is connected with the microprocessor MCU.
The traveling wave signal processing module is used for processing the current traveling wave sampling data, the traveling wave signal processing module can adopt a RSA306B USB real-time spectrum analyzer of Tektronix Talcr or other products of the same brand type, and the current traveling wave sampling data is subjected to analog integration low-frequency compensation circuit, high-pass filter circuit and A/D conversion processing by the traveling wave signal processing module to obtain a high-frequency traveling wave digital signal and is transmitted to the microprocessor MCU39.
Further, the traveling wave signal processing module in this embodiment is further provided with a filter and a comparator, as shown in fig. 5, where the filter may be a TE tavac 20EEJ type 1 filter, or other brands of products of the same type; the comparator can adopt an ADI AD8034ARZ type operational amplifier and a comparator; the filter is respectively connected with the traveling wave transformer and the comparator, and the comparator is connected with the I/O port of the microprocessor MCU. The filter is used for filtering traveling wave current signals acquired by the traveling wave transformer and sending the filtered signals to the comparator; the comparator compares whether the traveling wave current signal filtered by the filter is larger than a preset traveling wave current signal threshold value, and outputs a high-level signal to the microprocessor MCU39 when the traveling wave current signal is larger than the preset traveling wave current signal threshold value, and outputs a trigger signal to realize the wake-up mode of the fault location data detection device of the power distribution network, so that the fault location data detection device of the power distribution network enters a working state.
The microprocessor MCU is connected with the time setting module, the large-capacity data storage module, the remote communication module, the crystal oscillator module and the digital-to-analog converter, and the digital-to-analog converter is connected with the crystal oscillator module. The microprocessor MCU can adopt ST STM32F407ZET6 type STM32 singlechip or other brands and products of the same type; the time setting module can adopt a synchronous world Beidou gps satellite time service device or other brands of products of the same type; the mass data storage module may employ Siemens 6DD1660-0BH1 type data storage, or other brands of same type products; the remote communication module can adopt an ABB remote I/O communication module or other brands of products of the same type; the crystal oscillator module can adopt Epson FA-128.4000 MF10Z-K high-precision crystal oscillator or other brands of products of the same type; the digital-to-analog converter may employ a micro-core MCP4725A0T-E/CH type digital-to-analog converter, or other brands of the same type of product.
Wherein, the microprocessor MCU is matched with the remote communication module and used for data communication between the device and the master station 3; the data for monitoring the point positions are sent to the master station 3, and the master station 3 locates the traveling wave faults according to the point positions to be detected. The microprocessor MCU is matched with the time setting module and used for loading accurate time labels for the sampling data. The microprocessor MCU is matched with the large-capacity data storage module and used for storing current and traveling wave data of the distribution cable 9 in a set time range. The microprocessor MCU is matched with the crystal oscillator module and used for providing a high-precision working clock for the microprocessor MCU and carrying out automatic frequency calibration according to the second pulse signal output by the time synchronization module. The digital-to-analog converter is used for realizing the frequency calibration of the crystal oscillator module by clock deviation obtained by the microprocessor MCU.
In summary, the power distribution network fault location data detection device 1 can detect phase currents and current traveling waves of each phase on a power distribution network main line and each branch line, and the power distribution network fault accurate location device can detect phase currents and current traveling waves of each phase on the power distribution network main line and each branch line and provide phase current and current traveling wave data of each phase for fault accurate location; the power distribution network fault accurate positioning device is arranged on the power distribution network main line and each branch line, so that the power distribution network fault accurate positioning can be carried out by matching with the main station 3.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a distribution network fault location data detection device which characterized in that: the power distribution network fault positioning data detection device is arranged on a power distribution network main line and each branch line, and is in wireless communication connection with a communication base station, and the communication base station is in wireless communication connection with a server of a main station; the fault positioning data detection device of the power distribution network comprises a shell, wherein a traveling wave transformer, a current transformer, a traveling wave signal processing module, a current signal processing module, a time setting module, a microprocessor MCU, a remote communication module, a large-capacity data storage module, a power module, a digital-to-analog converter and a crystal oscillator module are arranged in the shell;
the power supply module is respectively connected with each module, the current transformer is connected with the current signal processing module, and the current signal processing module is connected with the microprocessor MCU; the traveling wave transformer is connected with the traveling wave signal processing module, and the traveling wave signal processing module is connected with the microprocessor MCU; the microprocessor MCU is connected with the time setting module, the large-capacity data storage module, the remote communication module, the crystal oscillator module and the digital-to-analog converter, and the digital-to-analog converter is connected with the crystal oscillator module.
2. The power distribution network fault location data detection device of claim 1, wherein: the shell comprises an upper shell and a lower shell, wherein the upper shell and the lower shell are connected in a buckling manner and can clamp a cable after being fixed through a screw; the upper shell and the lower shell are provided with through holes for the matched cables to pass through, cavities are formed in the upper shell and the lower shell, a circuit board is arranged in the cavities, and each module is arranged on the circuit board.
3. The power distribution network fault location data detection device of claim 1, wherein: the power supply module comprises a power supply management module, a coupling induction power taking module, a photovoltaic power taking module and a backup battery power taking module, wherein the coupling induction power taking module, the photovoltaic power taking module and the backup battery power taking module are connected with the power supply management module; the coupling induction power taking module is arranged on a cable of a main line and each branch line of the power distribution network and can take power from the power distribution line in an induction way; the photovoltaic power taking module can be connected with a photovoltaic panel installed outside.
4. The power distribution network fault location data detection device of claim 1, wherein: the microprocessor MCU adopts stm32 singlechip.
5. The power distribution network fault location data detection device of claim 1, wherein: the traveling wave transformer adopts a rogowski coil transformer.
6. The power distribution network fault location data detection device of claim 1, wherein: the traveling wave signal processing module comprises a filter and a comparator; the filter is respectively connected with the traveling wave transformer and the comparator, and the comparator is connected with the I/O port of the microprocessor MCU.
7. The power distribution network fault location data detection device of claim 1, wherein: the shell is also provided with a power switch and an indicator lamp, and the power switch and the indicator lamp are respectively connected with the microprocessor MCU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321602116.3U CN220120923U (en) | 2023-06-25 | 2023-06-25 | Fault location data detection device for power distribution network |
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| CN202321602116.3U CN220120923U (en) | 2023-06-25 | 2023-06-25 | Fault location data detection device for power distribution network |
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