Electric power line fault early warning and positioning system

Abstract

The utility model discloses an electric power line fault early warning and positioning system which comprises a processing module, an A / D data conversion module, a high-precision clock module and an acquisition monitoring module. The acquisition monitoring module is connected with the processing module through the A / D data conversion module; the high-precision clock module is used for receiving a clock signal of a GPS / BDS Beidou system and transmitting the clock signal to the processing module to keep the clock consistent; the acquisition monitoring module comprises two groups of current traveling wave monitoring modules and voltage traveling wave monitoring modules which are used for monitoring current loops and voltage loops of two three-phase cable lines respectively, and the number of the voltage loops and the number of the current loops are both six. According to the utility model, one device can simultaneously monitor a primary load electric power circuit and a comprehensive through load electric power circuit, and can accurately position fault points.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable line faults, and particularly relates to a power line fault early warning and positioning system applicable to overhead, cable, and overhead-cable hybrid power lines. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model and do not necessarily constitute prior art.

[0003] Railway power supply lines are generally composed of power through lines set along the entire railway line. The monitoring of power supply line faults is still in the development stage. Currently, line monitoring methods include partial discharge monitoring method, impedance monitoring method, reactance monitoring method, traveling wave ranging monitoring method, ground loop current monitoring method, etc.

[0004] The ground loop current monitoring method can only monitor data and cannot achieve early warning of power lines and precise positioning of fault points; the partial discharge monitoring method alone is difficult to eliminate and prevent external interference by hardware technology. The connection system environment of railway power lines is relatively complex, and there are many external interference sources, so the partial discharge monitoring method often cannot make accurate judgments and precise positioning; the impedance monitoring method and the reactance monitoring method have large fault location deviations in actual applications; the traveling wave ranging monitoring method is a well-applied technical means in the current railway power cable line fault location. Using the principles of voltage traveling waves and current traveling waves, the judgment of the fault point is relatively consistent with the actual occurrence point and is basically not affected by external interference.

[0005] In the traveling wave ranging monitoring method in the prior art, as disclosed in the patent application No. 202210538821.5, "A High-Voltage Cable Fault Location System Based on the Double-End Traveling Wave Method", a terminal system, a communication network, and a master station system are disclosed; the terminal system includes a traveling wave data acquisition module, a processing module, a Beidou time synchronization module, and a power supply module. The traveling wave data acquisition module acquires the transient current and voltage information of the three phases of the high-voltage cable, and the microprocessor outputs the fault traveling wave information, which is then transmitted to the master station system through the communication network. It can be seen that in the above patent, the acquisition module is set in or near the substation bus PT cabinet, and the voltage waveforms and data of the three-phase voltage of the bus and the zero-sequence voltage of the bus are acquired. To sum up, the data acquired in the prior art is single, which affects the reliability and accuracy of power cable line fault location, and it is also impossible to monitor the primary load power line and the integrated through load power line with one device at the same time, resulting in a waste of a large amount of manpower, material resources, and financial resources. And currently, railway power supply lines are generally double-loop power supplies, and the prior art is not suitable for monitoring double-loop power lines at the same time. Summary of the Utility Model

[0006] To solve the above problems, the present utility model proposes a power line fault warning and positioning system, which not only improves the reliability and accuracy of cable line fault positioning, but also enables one device to monitor the primary load power line and the integrated through-load power line simultaneously.

[0007] To achieve the above object, the present utility model adopts the following technical solutions:

[0008] In the first aspect, the present utility model proposes a power line fault warning and positioning system, which is connected to the background master station system through an optical fiber channel, and includes:

[0009] A processing module, an A / D data conversion module, a high-precision clock module, and a collection and monitoring module; the monitoring module is connected to the processing module through the A / D data conversion module; the high-precision clock module is used to receive the clock signals of the GPS / BDS Beidou system and transmit them to the processing module to keep the clocks consistent;

[0010] The collection and monitoring module includes two groups of current traveling wave monitoring modules and voltage traveling wave monitoring modules, which are used to monitor the current circuits and voltage circuits of two 3-phase cable lines respectively, and both the voltage circuit and the current circuit are 6-way.

[0011] As a further technical solution, the fault positioning device further includes a storage unit, which is connected to the collection and monitoring module for data storage.

[0012] As a further technical solution, the fault positioning device further includes a power supply module, which receives 110 / 220V AC or DC current for power supply.

[0013] As a further technical solution, a multi-core and multi-thread CPU processing module, a debugging interface unit, and a high-speed communication module are directly connected to the processing module.

[0014] As a further technical solution, an optical fiber communication interface is provided on the high-speed communication module, and data forwarding and remote transmission are realized through the optical fiber communication interface.

[0015] As a further technical solution, the two groups of current traveling wave monitoring modules and voltage traveling wave monitoring modules are respectively arranged on the current circuit and the voltage circuit. The current traveling wave monitoring module obtains the current traveling wave analog signal through the CT secondary side of the current circuit, and the voltage traveling wave monitoring obtains the voltage traveling wave analog signal through the PT secondary side of the voltage circuit.

[0016] As a further technical solution, each circuit in the current circuit includes three lines: phase A, phase B, and phase C.

[0017] As a further technical solution, each loop in the voltage loop includes three lines: phase A, phase B, and phase C.

[0018] As a further technical solution, two sets of power line fault warning and positioning systems are provided. The two sets of power line fault warning and positioning systems are respectively connected to two distribution substations or box-type transformers, and a primary load line and a comprehensive load line are connected between the two distribution substations or box-type transformers.

[0019] As a further technical solution, both the primary load line and the comprehensive load line include 6 voltage loops and 6 current loops.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] In the power line fault warning and positioning system proposed by the present utility model, two sets of current traveling wave monitoring modules and voltage traveling wave monitoring modules are used to respectively monitor the current loops and voltage loops of two 3-phase cable lines, and both the voltage loop and the current loop are 6-way, realizing that one device can simultaneously monitor the primary load power line and the comprehensive through-load power line.

[0022] The power line fault warning and positioning system proposed by the present utility model can realize intelligent monitoring and accurate positioning of the operating health status of railway power lines through the mutual cooperation between modules such as the processing module, A / D data conversion module, high-precision clock module, and acquisition and monitoring module, and can effectively avoid larger grounding short-circuit accidents and power line combustion accidents caused by the gradual damage of the power line insulation.

[0023] The present utility model has the function of power line fault positioning. After the occurrence of power line grounding and short-circuit faults, it can accurately locate the fault point in real time, greatly reducing the manpower, material resources, and financial resources for finding the fault point. The present utility model meets the safety operation requirements of railway power lines, ensures the safe power supply of railways, and improves the automation level of the railway power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The specification drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model.

[0025] Figure 1 is a schematic diagram of the principle of the power line fault warning and positioning system provided by the present utility model;

[0026] Figure 2 are the 6 voltage loops and 6 current loops in the power line fault warning and positioning system provided by the present utility model;

[0027] Figure 3 It is a schematic structural diagram of the power line fault warning and positioning system provided by the present utility model; Specific embodiments

[0028] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0030] Embodiment 1

[0031] This embodiment provides a power line fault warning and positioning system, as Figure 1 shown, the warning and positioning system is connected to the background master station system through an optical fiber channel, and specifically includes: a processing module, an A / D data conversion module, a high-precision clock module, and a collection and monitoring module; among them, the collection and monitoring module is used to obtain and monitor the traveling wave analog signal, and transmit the obtained traveling wave analog signal to the A / D data conversion module. The A / D data conversion module is used to receive the traveling wave data transmitted by the collection and monitoring module, convert the traveling wave analog signal into a digital signal, and finally transmit the digital signal to the processing module. In this embodiment, the processing module can adopt an FPGA chip module, or other modules in the prior art that can realize the high-speed processing of various complex signals.

[0032] The high-precision clock module includes a high-precision time service clock module, which is used to receive the clock signals of the GPS / BDS Beidou system, perform synchronous time alignment, and finally transmit the clock signals to the processing module to ensure that the clocks of the devices are consistent and ensure the consistency and accuracy of device data judgment.

[0033] In this embodiment, as Figure 1 shown, the collection and monitoring module includes two groups of current traveling wave monitoring modules and voltage traveling wave monitoring modules, which can simultaneously monitor the voltage and current states of two 3-phase cable lines, specifically used to monitor the current circuits and voltage circuits of two 3-phase cable lines respectively. As Figure 2 shown, in this embodiment, both the voltage circuit and the current circuit are 6-way, and can simultaneously monitor the first-class load power line and the comprehensive through-load power line. Specifically: Since the railway power supply system usually adopts a dual-loop power supply configuration of the first-class through line and the comprehensive through line, each loop power supply includes three lines of phase A, phase B, and phase C, and 6-way voltage and 6-way current are designed according to the characteristics of railway power supply.

[0034] Two groups of current traveling wave monitoring modules and voltage traveling wave monitoring modules are respectively arranged on the current loop and the voltage loop. The current traveling wave monitoring module obtains the current traveling wave analog signal through the secondary side of the CT in the current loop, and the voltage traveling wave monitoring obtains the voltage traveling wave analog signal through the secondary side of the PT in the voltage loop; there is no need to install special acquisition equipment. The acquired traveling wave analog signal is converted between the current traveling wave and voltage traveling wave analog signals and digital signals by the A / D data conversion module.

[0035] In this embodiment, as Figure 1 shown, the power cable line fault location device further includes a large-capacity storage unit, which is connected to the acquisition and monitoring module for storing the acquired data. The storage unit can store at least 1000 independent fault data, facilitating the retrieval of the line health status and faults at any time. In addition, the power cable line fault location device also includes a power supply module, which receives 110 / 220V AC or DC current through the power supply module to supply power to the electronic modules and devices in the device.

[0036] In this embodiment, as Figure 1 shown, a multi-core and multi-thread CPU processing module, a debugging interface unit, and a high-speed communication module are directly connected to the processing module (FPGA chip); the multi-core and multi-thread CPU processing module is used to complete the final data operation and processing. Specifically, it is used to perform high-speed processing of the acquired data, high-precision synchronous data high-speed processing, and send it to the multi-core and multi-thread CPU module. The multi-core and multi-thread CPU module is responsible for the final data execution, calculation, data storage, data extraction and other functions. The debugging interface unit is used to input various parameters; the high-speed communication module is provided with an optical fiber communication interface, and data forwarding and remote transmission are realized through the optical fiber communication interface. The above-mentioned modules and units can all adopt the modules and units in the prior art to achieve the effect. This embodiment protects its structural features and does not improve its processing and calculation process.

[0037] The working method of the present utility model is:

[0038] According to the characteristics of the current railway power lines, the device provided in this embodiment is equipped with both a voltage acquisition channel and a current acquisition channel for simultaneous analysis. Using 6 voltage circuits and 6 current circuits can simultaneously meet the monitoring of first-class load power lines and comprehensive load power lines. Adopting the double-end monitoring and positioning principle improves the reliability and accuracy of the power lines. The device system can intelligently judge the accurate position of the fault point on the cable line based on the fault voltage and current and the topological relationship of the power line, based on the phase-mode transformation and wavelet analysis theory (existing theory).

[0039] In this embodiment, a power line fault warning and positioning system is provided. There are two sets of power line fault warning and positioning systems, and each set is connected to two distribution substations or box-type transformers. An emergency load line and a comprehensive load line are connected between the two distribution substations or box-type transformers. Both the emergency load line and the comprehensive load line include 6 voltage circuits and 6 current circuits.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A power line fault warning and positioning system, the warning and positioning system is connected to the background master station system through an optical fiber channel, characterized in that, Including: A processing module, an A / D data conversion module, a high-precision clock module, and a collection and monitoring module; The monitoring module is connected to the processing module through the A / D data conversion module; the high-precision clock module is used to receive the clock signal of the GPS / BDS Beidou system and transmit it to the processing module to keep the clocks consistent; The collection and monitoring module includes two groups of current traveling wave monitoring modules and voltage traveling wave monitoring modules, which are used to monitor the current circuits and voltage circuits of two 3-phase cable lines respectively, and both the voltage circuit and the current circuit are 6-way.

2. The power line fault warning and location system according to claim 1, characterized in that, The system further includes a storage unit, which is connected to the collection and monitoring module for data storage.

3. The power line fault warning and positioning system according to claim 1, characterized in that The system further includes a power supply module, which receives 110 / 220V AC or DC current for power supply.

4. The power line fault warning and location system according to claim 1, characterized in that, A multi-core and multi-thread CPU processing module, a debugging interface unit, and a high-speed communication module are directly connected to the processing module.

5. The power line fault warning and positioning system according to claim 4, characterized in that, An optical fiber communication interface is provided on the high-speed communication module, and data forwarding and remote transmission are realized through the optical fiber communication interface.

6. The power line fault warning and positioning system according to claim 1, characterized in that The two groups of current traveling wave monitoring modules and voltage traveling wave monitoring modules are respectively arranged on the current circuit and the voltage circuit. The current traveling wave monitoring module obtains the current traveling wave analog signal through the CT secondary side of the current circuit, and the voltage traveling wave monitoring obtains the voltage traveling wave analog signal through the PT secondary side of the voltage circuit.

7. The power line fault warning and positioning system according to claim 1, characterized in that Each circuit in the current circuit includes three lines: phase A, phase B, and phase C.

8. The power line fault warning and positioning system according to claim 1, characterized in that Each circuit in the voltage circuit includes three lines: phase A, phase B, and phase C.

9. The power line fault warning and positioning system according to claim 1, characterized in that, Two sets of power line fault warning and positioning systems are provided. The two sets of power line fault warning and positioning systems are respectively connected to two distribution substations or box-type transformers, and a primary load line and a comprehensive load line are connected between the two distribution substations or box-type transformers.

10. The power line fault warning and positioning system according to claim 9, characterized in that, Both the primary load line and the comprehensive load line include 6 voltage circuits and 6 current circuits.

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