Complex power distribution network fault positioning device capable of expanding input signals
By introducing a combination of a three-phase current detection module, an analog multiplexer, and a DSP processor into the distribution network fault location device, the problems of high cost and poor adaptability of existing devices have been solved, enabling flexible signal expansion and rapid fault location, thus promoting the development of smart grids.
Patent Information
- Application Number
- CN202422856185.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-22
AI Technical Summary
Existing fault location devices for distribution networks suffer from high costs, poor adaptability, difficulties in data integration, and complex implementation, making it difficult to effectively cope with the complex power flows brought about by distributed generation.
The system employs a combination of multiple three-phase current detection modules, an analog multiplexer, multiple ADC channels, a DSP processor, a display module, and a power supply module. The analog multiplexer enables periodic sampling of multiple sets of three-phase current signals, the powerful computing capabilities of the DSP processor are used for fault segment analysis, and the display module displays the fault location in real time.
It achieves highly scalable, adaptable, and real-time fault location, reduces operating costs, improves fault location technology, and supports the construction of smart grids.
Smart Images
Figure CN223486099U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of distribution network fault location technology, specifically to a complex distribution network fault location device with expandable input signals. Background Technology
[0002] In China, the high-quality development of power distribution networks has become a top priority of national policy. The "Guiding Opinions on High-Quality Development of Power Distribution Networks under the New Circumstances" clearly states that power distribution networks, as important public infrastructure, play a crucial role in ensuring power supply, supporting economic and social development, and improving people's livelihoods. Existing power distribution network fault location devices have the following shortcomings: First, many devices rely on expensive equipment, such as miniature phasor measurement units (μPMUs), which are difficult to deploy in large-scale distribution networks with numerous nodes. Second, with the widespread adoption of distributed generation, existing devices are inadequate in handling the complex power flows brought about by these distributed energy sources. While digital twin technology and machine learning offer new solutions, they still face challenges such as data integration difficulties and high computational resource requirements. In summary, existing power distribution network fault location devices mainly face problems such as high cost, poor adaptability, difficulties in data integration, and complex implementation. These shortcomings mean that existing power distribution network fault location devices need further technological improvements and innovations to cope with the complexity and evolution of modern power distribution networks. Utility Model Content
[0003] To address the main problems of high cost, poor adaptability, difficulty in data integration, and complex implementation of existing distribution network fault location devices, this utility model provides a complex distribution network fault location device with expandable input signals.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] A complex power distribution network fault location device with expandable input signals includes multiple three-phase current detection modules, multiple analog multiplexers, multiple ADC channels, a DSP processor, a display module, and a power supply module. Each three-phase current detection module contains multiple sets of three-phase current detection units. The input terminal of each analog multiplexer is connected one-to-one with the output terminals of the multiple sets of three-phase current detection units in one of the three-phase current detection modules. The output terminals of the multiple analog multiplexers are connected to the input terminal of the DSP processor through the multiple ADC channels. The output terminal of the DSP processor is connected to the display module. The DSP processor is also connected to the address pins of the multiple analog multiplexers to control the multiplexers to switch electrical connections between the multiple sets of three-phase current detection units in each three-phase current detection module, thereby realizing periodic sampling of multiple sets of three-phase current signals. The power supply module is connected to the multiple sets of three-phase current detection units, the multiple analog multiplexers, and the DSP processor in each three-phase current detection module.
[0006] Compared with existing technologies, the complex power distribution network fault location device with expandable input signals provided by this utility model collects a set of three-phase current (e.g., A, B, and C phase currents) signals through each set of three-phase current detection units. The output of each set of three-phase current detection units passes through an analog multiplexer. Under the control of a DSP processor, the analog multiplexer selects one signal route from among the multiple current signals and routes it to multiple ADC channels. The multiple ADC channels convert the analog current signals into digital signals and send them to the DSP processor. The DSP processor processes and calculates the digital signals to determine the fault section and sends the results to the display module to display the current fault section information in real time, so that on-site personnel can quickly understand the fault location. This device uses an analog multiplexer to achieve periodic sampling of multiple sets of three-phase current signals, effectively expanding the input signal channels with a limited number of multiple ADC channels. It has flexible channel expansion capabilities. Utilizing the powerful computing power of the DSP processor, it can be flexibly adjusted to adapt to the complex needs of different power systems. The modular design of the device allows for the addition of more three-phase current detection modules according to actual needs, thereby meeting the expansion requirements of large-scale power monitoring. Therefore, this device features strong scalability, good adaptability, high real-time performance, and simple design, which is conducive to improving the level of fault location technology, reducing operating costs, promoting the construction of smart grids, and providing technical support for the implementation of smart grid planning.
[0007] Furthermore, the three-phase current detection unit adopts an INA214CIDCKT current sensing amplifier.
[0008] Furthermore, the analog multiplexer is selected as the CD74HC4067 sixteen-channel analog multiplexer.
[0009] Furthermore, the DSP processor uses the TMS320F28335 chip, and the multi-channel ADC uses the sixteen-channel ADC module that comes with the TMS320F28335 DSP processor.
[0010] Furthermore, the device also includes a communication module connected to the output of the DSP processor. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the principle of the complex power distribution network fault location device with expandable input signals provided by this utility model.
[0012] In the diagram, 1. Three-phase current detection module; 2. Multiple analog multiplexers; 3. Multiple ADC channels; 4. DSP processor; 5. Display module; 6. Power supply module; 7. Communication module. Detailed Implementation
[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.
[0014] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0015] Please refer to Figure 1As shown, this utility model provides a complex power distribution network fault location device with expandable input signals, including multiple three-phase current detection modules 1, multiple analog multiplexers 2, multiple ADC channels 3, a DSP processor 4, a display module 5, and a power supply module 6. Each three-phase current detection module 1 contains multiple sets of three-phase current detection units. The block diagram shows 5 sets of three-phase current detection units, with additional sets of three-phase current detection units for coverage of more detection points. The input terminal of each analog multiplexer 2 is connected one-to-one with the output terminals of multiple sets of three-phase current detection units in one of the three-phase current detection modules 1. That is, one three-phase current detection module 1 is equipped with one analog multiplexer 2, and every 3 signal input ports in the multiplexer are connected to one set of three-phase current detection units. The multiple analog multiplexers 5... The output of multiplexer 2 is connected to the input of DSP processor 4 via multiple ADC channels 3. The output of DSP processor 4 is connected to display module 5. DSP processor 4 is also connected to the address pins of multiple analog multiplexers 2 to control the multiplexers 2 to switch electrical connections between multiple sets of three-phase current detection units in each three-phase current detection module 1, thereby achieving periodic sampling of multiple sets of three-phase current signals. That is, DSP processor 4 selects a certain pin address to sequentially close the input port selector in multiplexer 2 to achieve electrical connection with the corresponding three-phase current detection unit. Power module 6 is connected to multiple sets of three-phase current detection units in each three-phase current detection module 1, multiple analog multiplexers 2, and DSP processor 4 to provide operating power.
[0016] Compared with existing technologies, the complex power distribution network fault location device with expandable input signals provided by this utility model collects a set of three-phase current (e.g., A, B, and C phase currents) signals through each set of three-phase current detection units. The output of each set of three-phase current detection units passes through an analog multiplexer. Under the control of a DSP processor, the analog multiplexer selects one signal route from among the multiple current signals and routes it to multiple ADC channels. The multiple ADC channels convert the analog current signals into digital signals and send them to the DSP processor. The DSP processor processes and calculates the digital signals to determine the fault section and sends the results to the display module to display the current fault section information in real time, so that on-site personnel can quickly understand the fault location. This device uses an analog multiplexer to achieve periodic sampling of multiple sets of three-phase current signals, effectively expanding the input signal channels with a limited number of multiple ADC channels. It has flexible channel expansion capabilities. Utilizing the powerful computing power of the DSP processor, it can be flexibly adjusted to adapt to the complex needs of different power systems. The modular design of the device allows for the addition of more three-phase current detection modules according to actual needs, thereby meeting the expansion requirements of large-scale power monitoring. Therefore, this device features strong scalability, good adaptability, high real-time performance, and simple design, which is conducive to improving the level of fault location technology, reducing operating costs, promoting the construction of smart grids, and providing technical support for the implementation of smart grid planning.
[0017] As a specific embodiment, the three-phase current detection unit is implemented using the existing INA214CIDCKT current sensing amplifier. The current sensing amplifier is an electronic device specifically designed for amplifying and measuring current signals. Based on Faraday's law of electromagnetic induction, it converts the magnetic field generated by the current into a voltage signal, which is then amplified and processed. This type of amplifier plays a key role in various applications, especially in situations requiring precise current control and measurement, and is particularly suitable for use in this device.
[0018] In a specific embodiment, the analog multiplexer 2 is implemented using the existing CD74HC4067 sixteen-channel analog multiplexer. This analog multiplexer is used to select between multiple three-phase current signals. The output of each group of three-phase current detection units is routed to the ADC channel after passing through the CD74HC4067 multiplexer. Since the number of ADC channels of the DSP processor 4 is limited, the multiplexing function of the CD74HC4067 can be used to switch between different three-phase current detection modules 1, effectively utilizing the limited ADC channel resources to achieve periodic sampling of multiple detection points.
[0019] In a specific embodiment, the DSP processor 4 is implemented using the existing TMS320F28335 chip, and the multi-channel ADC 3 uses the sixteen-channel ADC module built into the TMS320F28335 DSP processor. The AD converter converts the analog current signal into a digital signal for subsequent digital signal processing. During each acquisition cycle, the DSP processor 4 controls the multiplexer to select the corresponding channel for sampling, sequentially acquiring each group of three-phase current signals. The DSP processor 4 analyzes the acquired current signals, calculates and determines the fault section using its built-in algorithm, and sends the result to the display module 5 for display.
[0020] In a specific embodiment, the display module 5 can be implemented using an existing OLED display module. The power supply module 6 can be implemented using an existing PLF12F AC220V / DC5V module and an LM1117-3.3 low-dropout regulator; wherein, the PLF12F AC220V / DC5V module is responsible for converting the standard AC 220V voltage to DC 5V voltage to provide basic power input, and the LM1117-3.3 low-dropout regulator is responsible for further stepping down the 5V DC voltage to 3.3V to power some low-voltage devices in the device (such as DSP and signal processing circuits) and ensure the stable operation of the device.
[0021] For a specific embodiment, please refer to Figure 1 As shown, the device also includes a communication module 7 connected to the output of the DSP processor 4. The communication module 7 can be implemented using an existing MAX485 TTL / RS485 module. RS485 is a commonly used industrial communication interface, suitable for data transmission over long distances and in interference-resistant environments. The DSP processor 4 stably uploads fault section information to the main station through the RS485 interface so that fault recording and remote monitoring can be performed in the centralized monitoring system.
[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A fault location device for complex power distribution networks with expandable input signals, characterized in that, The system includes multiple three-phase current detection modules, multiple analog multiplexers, multiple ADC channels, a DSP processor, a display module, and a power supply module. Each three-phase current detection module contains multiple sets of three-phase current detection units. The input terminal of each analog multiplexer is connected to the output terminals of the multiple sets of three-phase current detection units in one of the three-phase current detection modules. The output terminals of the multiple analog multiplexers are connected to the input terminals of the DSP processor through multiple ADC channels. The output terminal of the DSP processor is connected to the display module. The DSP processor is also connected to the address pins of the multiple analog multiplexers to control the multiplexers to switch electrical connections between the multiple sets of three-phase current detection units in each three-phase current detection module, thereby achieving periodic sampling of multiple sets of three-phase current signals. The power supply module is connected to the multiple sets of three-phase current detection units, the multiple analog multiplexers, and the DSP processor in each three-phase current detection module.
2. The complex power distribution network fault location device with expandable input signals according to claim 1, characterized in that, The three-phase current detection unit uses an INA214CIDCKT current sensing amplifier.
3. The complex power distribution network fault location device with expandable input signals according to claim 1, characterized in that, The analog multiplexer used is the CD74HC4067 sixteen-channel analog multiplexer.
4. The complex power distribution network fault location device with expandable input signals according to claim 1, characterized in that, The DSP processor uses the TMS320F28335 chip, and the multi-channel ADC uses the sixteen-channel ADC module that comes with the TMS320F28335 DSP processor.
5. The complex power distribution network fault location device with expandable input signals according to claim 1, characterized in that, The device also includes a communication module connected to the output of the DSP processor.