Distribution line traveling wave fault location and fault recording integrated device

Abstract

The utility model discloses a distribution line traveling wave distance measurement and fault recording integrated device, which comprises a host and two auxiliary machines, and the host and the auxiliary machines are connected through a wireless network. The host comprises a main traveling wave current acquisition module, a main power frequency current acquisition module, a main ground electric field acquisition module, a main CT power taking module, a main Beidou satellite time service module, a main intra-group communication module, a main station communication module and a first main control unit. The auxiliary machine comprises an auxiliary traveling wave current acquisition module, an auxiliary power frequency current acquisition module, an auxiliary ground electric field acquisition module, an auxiliary CT power taking module, an auxiliary Beidou satellite time service module, an auxiliary intra-group communication module and a second main control unit. According to the utility model, the problems in the prior art that the traditional transient wave recording type fault indicating device depends on a convergence unit and has no accurate fault positioning and insulation monitoring functions are solved, and the functions of accurate fault positioning and line insulation hidden danger monitoring can be realized while the fault identification of the distribution line is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution line design, in particular to an integrated device for traveling wave ranging and fault recording of distribution lines. Background Technique

[0002] Traditional transient recording type fault indication devices for distribution networks mainly implement the two-remote functions of distribution networks, namely fault tele-signaling and electrical quantity telemetry. The device monitors the fault current and ground electric field data of the line in real time, sends the data to the aggregation unit installed on the pole tower, and performs fault similarity recognition and uploads the fault waveform to the distribution network master station through the aggregation unit. The device can identify and judge short-circuit faults and grounding faults in the distribution network. However, due to the lack of high-frequency traveling wave monitoring and synchronization functions, it is impossible to locate the specific fault location, identify high-resistance grounding faults and monitor the insulation hidden dangers of the line. It can only locate the fault section. At the same time, during operation, it depends on the aggregation unit installed on the pole tower, and the aggregation unit aggregates the data for fault analysis and communication functions. Content of the Utility Model

[0003] In order to solve the above problems, the utility model provides an integrated device for traveling wave ranging and fault recording of distribution lines, which includes a main machine and two auxiliary machines; the main machine and the auxiliary machines are connected through a wireless network. The main machine is used to collect data information in the main machine and receive the collected data information of the two auxiliary machines and transmit them to the distribution network master station; the auxiliary machines are used to collect data information in the auxiliary machines and transmit them to the main machine.

[0004] Further, the main machine includes: a main traveling wave current acquisition module, a main power frequency current acquisition module, a main ground electric field acquisition module, a main CT power supply module, a main Beidou satellite time synchronization module, a main intra-group communication module, a main station communication module and a first main control unit; the main traveling wave current acquisition module, the main power frequency current acquisition module, the main ground electric field acquisition module, the main CT power supply module, the main Beidou satellite time synchronization module, the main intra-group communication module, and the main station communication module are all arranged around the first main control unit; the main traveling wave current acquisition module, the main power frequency current acquisition module, the main ground electric field acquisition module, the main CT power supply module, and the main Beidou satellite time synchronization module are respectively connected to the first main control unit through wires; the main intra-group communication module is connected to the first main control unit through a wire; the main station communication module is connected to the first main control unit through a wire.

[0005] Further, the auxiliary machine includes: an auxiliary traveling wave current acquisition module, an auxiliary power frequency current acquisition module, an auxiliary ground electric field acquisition module, an auxiliary CT power acquisition module, an auxiliary Beidou satellite time synchronization module, an auxiliary in-group communication module, and a second main control unit; the auxiliary traveling wave current acquisition module, the auxiliary power frequency current acquisition module, the auxiliary ground electric field acquisition module, the auxiliary CT power acquisition module, the auxiliary Beidou satellite time synchronization module, and the auxiliary in-group communication module are all arranged around the second main control unit; the auxiliary traveling wave current acquisition module, the auxiliary power frequency current acquisition module, the auxiliary ground electric field acquisition module, the auxiliary CT power acquisition module, and the auxiliary Beidou satellite time synchronization module are respectively connected to the second main control unit through wires; the auxiliary in-group communication module is connected to the second main control unit through a wire.

[0006] Further, the main CT power acquisition module is used to supply power to the main machine; the auxiliary CT power acquisition module is used to supply power to the auxiliary machine.

[0007] Further, the main machine and the auxiliary machine are connected through an RF wireless network.

[0008] Further, the main traveling wave current acquisition module is acquired through a traveling wave current sensor; the main power frequency current acquisition module is acquired through a power frequency current sensor; the main ground electric field acquisition module is acquired through a ground electric field sensor.

[0009] Further, the auxiliary traveling wave current acquisition module is acquired through a traveling wave current sensor; the auxiliary power frequency current acquisition module is acquired through a power frequency current sensor; the auxiliary ground electric field acquisition module is acquired through a ground electric field sensor.

[0010] The utility model provides an integrated device for traveling wave ranging and fault recording of a distribution line, which has the following beneficial effects:

[0011] The utility model solves the problems in the prior art that the traditional transient recording type fault indicator depends on the aggregation unit and has no precise fault location and insulation monitoring functions, and can realize fault precise location and line insulation hidden danger monitoring functions while realizing the fault identification of the distribution line. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0013] Figure 1 It is a schematic diagram of the connection relationship between the main machine and the auxiliary machine provided by the present utility model;

[0014] Figure 2 Schematic diagram of the mainframe structure provided by the present utility model;

[0015] Figure 3 Schematic diagram of the auxiliary machine structure provided by the present utility model.

[0016] In the figure, 1 is the mainframe; 2 is the auxiliary machine; 1-1 is the main traveling wave current acquisition module; 1-2 is the main power frequency current acquisition module; 1-3 is the main ground electric field acquisition module; 1-4 is the main CT power supply module; 1-5 is the main Beidou satellite time synchronization module; 1-6 is the main in-group communication module; 1-7 is the main station communication module; 1-8 is the first main control unit; 2-1 is the auxiliary traveling wave current acquisition module; 2-2 is the auxiliary power frequency current acquisition module; 2-3 is the auxiliary ground electric field acquisition module; 2-4 is the auxiliary CT power supply module; 2-5 is the auxiliary Beidou satellite time synchronization module; 2-6 is the auxiliary in-group communication module; 2-7 is the second main control unit. Specific implementation manners

[0017] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0018] The following will describe in detail the implementation method of the present utility model with reference to the accompanying drawings. The described are only some embodiments, not all embodiments. For the purpose of clarity, the representations and descriptions unrelated to the present utility model are omitted in the drawings and the description.

[0019] For a clearer understanding of the technical features, objectives, and beneficial effects of the present utility model, the technical solutions of the present utility model are described in detail below. Obviously, the described embodiments are some embodiments of the present utility model, not all embodiments, and should not be construed as limiting the scope of implementation of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0020] As Figure 1 shown, a traveling wave ranging and fault recording integrated device for a distribution line includes a mainframe 1 and two auxiliary machines 2; the mainframe 1 and the auxiliary machines 2 are connected through a wireless network. The mainframe 1 is used to collect data information in the mainframe 1 and receive the collected data information of the two auxiliary machines 2 and transmit it to the distribution network main station; the auxiliary machines 2 are used to collect data information in the auxiliary machines 2 and transmit it to the mainframe 1.

[0021] The mainframe 1 includes, as Figure 2Shown as follows: main traveling wave current acquisition module 1-1, main power frequency current acquisition module 1-2, main ground electric field acquisition module 1-3, main CT power supply module 1-4, main Beidou satellite time synchronization module 1-5, main in-group communication module 1-6, main station communication module 1-7, and first main control unit 1-8.

[0022] The main traveling wave current acquisition module 1-1, main power frequency current acquisition module 1-2, main ground electric field acquisition module 1-3, main CT power supply module 1-4, main Beidou satellite time synchronization module 1-5, main in-group communication module 1-6, and main station communication module 1-7 are all arranged around the first main control unit 1-8; the main traveling wave current acquisition module 1-1, main power frequency current acquisition module 1-2, main ground electric field acquisition module 1-3, main CT power supply module 1-4, and main Beidou satellite time synchronization module 1-5 are respectively connected to the first main control unit 1-8 through wires; the main in-group communication module 1-6 is connected to the first main control unit 1-8 through wires and is connected to the auxiliary machine 2 through an RF wireless network; the main station communication module 1-7 is connected to the first main control unit 1-8 through wires and is connected to the outside through a 4G wireless network.

[0023] Among them, the main traveling wave current acquisition module 1-1 is a line high-frequency current recording unit. This module filters out the interference of the line power frequency current in hardware and only has the function of processing and acquiring the high-frequency current under various line faults. The sampling rate of this module is relatively high, usually reaching several MHz, such as 2 MHz. The traveling wave current sensor adopts the Rogowski coil principle, and the sensor response frequency range is relatively wide, up to 1 MHz. Inside the device, the signal output by the Rogowski coil is restored to a signal with the same current magnitude on the wire through an analog integration circuit. After filtering out the power frequency band, this signal is sent to the subsequent high-speed ADC for sampling.

[0024] The main power frequency current acquisition module 1-2 mainly realizes the function of recording the line power frequency current during line faults. This module adopts a low-pass filter circuit in hardware to effectively filter out high-frequency interference. Usually, the sampling rate is relatively low, at several kHz, which is the same as that of traditional fault recording indicating devices, usually 4 kHz. The power frequency current sensor is based on the principle of a current transformer to realize the conversion from primary current to secondary current. The secondary current is transformed, amplified, and filtered and then sent to the low-speed ADC module for sampling.

[0025] The main ground electric field acquisition module 1-3 mainly realizes the function of recording the line power frequency voltage during line faults. This module adopts a low-pass filter current in hardware to effectively filter out high-frequency interference. Usually, the sampling rate is relatively low, at several kHz, which is the same as that of traditional fault recording indicating devices, usually 4 kHz. The ground electric field sensor is based on the principle of non-contact capacitive voltage division to realize the measurement of the line-to-ground voltage. The divided voltage is transformed, amplified, and filtered and then sent to the low-speed ADC module for sampling.

[0026] The main CT power acquisition module 1-4 mainly uses the principle of electromagnetic induction to inductively couple the magnetic field generated by the wire current to the power acquisition coil of the device, completing the process of generating electricity from magnetism, and the energy obtained through CT coupling powers the device.

[0027] The main Beidou satellite time synchronization module 1-5 provides a synchronous high-precision clock for the host, meeting the function of high-frequency traveling wave synchronous acquisition.

[0028] The main intra-group communication module 1-6 mainly realizes the communication function with the slave unit, completing the transmission of waveform data between the slave unit and the host. The communication module can use RF communication, or can use LORA or Zigbee modules.

[0029] The main station communication module 1-7 completes the upload of the integrated data to the distribution network main station system. The main station communication module uses communication modules such as 4G and 5G.

[0030] The first main control unit 1-8 is the core control unit of the host, managing various peripherals of the host, realizing functions such as fault judgment, coordination, communication with the slave unit, and communication with the main station, and completing the functions of fault data recording and synchronous acquisition.

[0031] The slave unit 2 includes, as Figure 3 shown: the auxiliary traveling wave current acquisition module 2-1, the auxiliary power frequency current acquisition module 2-2, the auxiliary ground electric field acquisition module 2-3, the auxiliary CT power acquisition module 2-4, the auxiliary Beidou satellite time synchronization module 2-5, the auxiliary intra-group communication module 2-6, and the second main control unit 2-7.

[0032] The auxiliary traveling wave current acquisition module 2-1, the auxiliary power frequency current acquisition module 2-2, the auxiliary ground electric field acquisition module 2-3, the auxiliary CT power acquisition module 2-4, the auxiliary Beidou satellite time synchronization module 2-5, and the auxiliary intra-group communication module 2-6 are all arranged around the second main control unit 2-7; the auxiliary traveling wave current acquisition module 2-1, the auxiliary power frequency current acquisition module 2-2, the auxiliary ground electric field acquisition module 2-3, the auxiliary CT power acquisition module 2-4, and the auxiliary Beidou satellite time synchronization module 2-5 are respectively connected to the second main control unit 2-7 through wires; the auxiliary intra-group communication module 2-6 is connected to the second main control unit 2-7 through wires and is connected to the host 1 through an RF wireless network.

[0033] Among them, the auxiliary traveling wave current acquisition module 2-1 is a line high-frequency current recording unit. This module filters out the interference of the line power frequency current in hardware and only processes and acquires the high-frequency current under various line faults. The sampling rate of this module is relatively high, usually reaching several MHz, such as 2MHz. The traveling wave current sensor uses the Rogowski coil principle, and the sensor response frequency range is relatively wide, up to 1MHz. Inside the device, the signal output by the Rogowski coil is restored to a signal with the same current magnitude on the wire through an analog integration circuit, and this signal is sent to the subsequent high-speed ADC for sampling after filtering out the power frequency band.

[0034] The auxiliary power frequency current acquisition module 2-2 mainly realizes the function of recording the power frequency current of the line during line faults. This module uses a low-pass filter circuit in hardware to effectively filter out high-frequency interference. Usually, the sampling rate is relatively low, at several kHz, which is the same as that of traditional fault recording indicating devices, usually 4 kHz. The power frequency current sensor is based on the principle of current transformer to realize the conversion from primary current to secondary current. The secondary current is sampled after transformation, amplification, and filtering and then sent to the low-speed ADC module.

[0035] The auxiliary ground electric field acquisition module 2-3 mainly realizes the function of recording the power frequency voltage of the line during line faults. This module uses a low-pass filter current in hardware to effectively filter out high-frequency interference. Usually, the sampling rate is relatively low, at several kHz, which is the same as that of traditional fault recording indicating devices, usually 4 kHz. The ground electric field sensor is based on the principle of non-contact capacitive voltage division to realize the measurement of the line-to-ground voltage. The divided voltage is sampled after transformation, amplification, and filtering and then sent to the low-speed ADC module.

[0036] The auxiliary CT power acquisition module 2-4 mainly uses the principle of electromagnetic induction to inductively couple the magnetic field generated by the wire current to the power acquisition coil of the device, completing the process of generating electricity from magnetism. The energy obtained through CT coupling is used to supply power to the device.

[0037] The auxiliary Beidou satellite time synchronization module 2-5 provides a synchronous high-precision clock for the host and slave machines to meet the function of synchronous acquisition of high-frequency traveling waves.

[0038] The auxiliary intra-group communication module 2-6 mainly realizes the communication function with the host machine and completes the transmission of waveform data between the host machine and the slave machine. The communication module can use RF communication, or LORA or Zigbee modules.

[0039] The second main control unit 2-7 is the core control unit of the slave machine, manages various peripherals of the slave machine, realizes coordinated communication with the host machine, and completes the functions of fault data recording and synchronous acquisition.

[0040] The working principle of the device of the present utility model is specifically as follows: The auxiliary device collects data of line high-frequency traveling wave current, line power frequency current, and line-to-ground voltage in real time. Then, it analyzes the line operation conditions. For example, if the traveling wave current exceeds a certain threshold, or the power frequency current suddenly changes or exceeds the threshold, or the line-to-ground voltage suddenly changes or exceeds the threshold, when one of these conditions is met, it is determined that a line fault has occurred. Then, the time of the fault occurrence is recorded, and at the same time, fault recording starts. The high-frequency traveling wave data records a recording length of 1000 us, and the power frequency current and line-to-ground voltage data record a recording length of 1000 ms. After the recording is completed, the 1000-us traveling wave data, 1000-ms power frequency current, 1000-ms line-to-ground voltage, and the fault time are sent to the host through the in-group communication module, and then enter the next judgment process. The host device also collects data of line high-frequency traveling wave current, line power frequency current, and line-to-ground voltage in real time. Then, it analyzes the line operation conditions. For example, if the traveling wave current exceeds a certain threshold, or the power frequency current suddenly changes or exceeds the threshold, or the line-to-ground voltage suddenly changes or exceeds the threshold, when one of these conditions is met, it is determined that a line fault has occurred. Then, the time of the fault occurrence is recorded, and at the same time, fault recording starts. The high-frequency traveling wave data records a recording length of 1000 us, and the power frequency current and line-to-ground voltage data record a recording length of 1000 ms. After the recording is completed, it waits to receive the waveform data of the auxiliary device. Finally, the host sends the 1000-us traveling wave data, 1000-ms power frequency current, 1000-ms line-to-ground voltage, and the fault time of the host itself and the data of the auxiliary device to the distribution network master station through the main station internal communication module, and then enters the next judgment process. After receiving the waveform data and the fault time uploaded by the host, the distribution network master station analyzes the line fault type based on the power frequency current and voltage data centrally, such as short circuit or grounding faults, etc. Then, it calculates the fault distance using the traveling wave double-end location principle based on the uploaded traveling wave data and the fault time. Specifically, the fault times of two devices with different installation positions are t1 and t2, and the installation distance between the two devices is L. Then, the distance of the fault from the device with the fault time of t1 is Lf = (L + (t1 - t2)v) / 2, where v is the propagation speed of the current in the wire.

[0041] The present utility model solves the problems in the prior art that the traditional transient recording type fault indicator device depends on the aggregation unit and has no precise fault location and insulation monitoring functions. It can realize the fault precise location and the monitoring function of the line insulation hidden danger while realizing the fault identification of the distribution line.

[0042] The above are only the preferred embodiments of the present utility model. It should be understood that the present utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the techniques or knowledge in related fields. And the changes and alterations made by those skilled in the art that do not depart from the spirit and scope of the present utility model shall all be within the protection scope of the appended claims of the present utility model.

Claims

1. A distribution line traveling wave ranging and fault recording integrated device, characterized in that: The invention comprises a main machine (1) and two auxiliary machines (2); the main machine (1) and the auxiliary machines (2) are connected via a wireless network, the main machine (1) is used to collect data information in the main machine (1) and receive the collected data information of the two auxiliary machines (2) and transmit it to the distribution network master station; the auxiliary machines (2) are used to collect data information in the auxiliary machines (2) and transmit it to the main machine (1).

2. The integrated device for traveling wave ranging and fault recording of distribution lines according to claim 1, characterized in that: The host (1) comprises: a main travelling wave current acquisition module (1-1), a main power frequency current acquisition module (1-2), a main ground electric field acquisition module (1-3), a main CT power acquisition module (1-4), a main Beidou satellite timing module (1-5), a main intra-group communication module (1-6), a main station communication module (1-7) and a first main control unit (1-8); The main travelling wave current acquisition module (1-1), the main power frequency current acquisition module (1-2), the main ground electric field acquisition module (1-3), the main CT power acquisition module (1-4), the main Beidou satellite timing module (1-5), the main intra-group communication module (1-6), and the main station communication module (1-7) are all arranged around the first main control unit (1-8); the main travelling wave current acquisition module (1-1), the main power frequency current acquisition module (1-2), the main ground electric field acquisition module (1-3), the main CT power acquisition module (1-4), and the main Beidou satellite timing module (1-5) are respectively connected to the first main control unit (1-8) through wires; the main intra-group communication module (1-6) is connected to the first main control unit (1-8) through wires; and the main station communication module (1-7) is connected to the first main control unit (1-8) through wires.

3. The integrated device for traveling wave ranging and fault recording of distribution lines according to claim 2, characterized in that: The auxiliary machine (2) comprises: an auxiliary travelling wave current acquisition module (2-1), an auxiliary power frequency current acquisition module (2-2), an auxiliary ground electric field acquisition module (2-3), an auxiliary CT power acquisition module (2-4), an auxiliary Beidou satellite timing module (2-5), an auxiliary intra-group communication module (2-6) and a second main control unit (2-7); The auxiliary traveling wave current acquisition module (2-1), the auxiliary power frequency current acquisition module (2-2), the auxiliary ground electric field acquisition module (2-3), the auxiliary CT power acquisition module (2-4), the auxiliary Beidou satellite timing module (2-5), and the auxiliary intra-group communication module (2-6) are all arranged around the second main control unit (2-7); the auxiliary traveling wave current acquisition module (2-1), the auxiliary power frequency current acquisition module (2-2), the auxiliary ground electric field acquisition module (2-3), the auxiliary CT power acquisition module (2-4), and the auxiliary Beidou satellite timing module (2-5) are respectively connected to the second main control unit (2-7) through wires; and the auxiliary intra-group communication module (2-6) is connected to the second main control unit (2-7) through wires.

4. The integrated device for traveling wave ranging and fault recording of distribution lines according to claim 3, characterized in that: The main CT power supply module (1-4) is used to supply power to the main machine (1); and the auxiliary CT power supply module (2-4) is used to supply power to the auxiliary machine (2).

5. The integrated device for traveling wave ranging and fault recording of distribution lines according to claim 1, characterized in that: The host machine (1) and the auxiliary machine (2) are connected via an RF wireless network.

6. The integrated device for traveling wave ranging and fault recording of distribution lines according to claim 2, characterized in that: The main travelling wave current acquisition module (1-1) acquires current through a travelling wave current sensor; the main power frequency current acquisition module (1-2) acquires current through a power frequency current sensor; and the main ground electric field acquisition module (1-3) acquires current through a ground electric field sensor.

7. The integrated device for traveling wave ranging and fault recording of distribution lines according to claim 3, characterized in that: The auxiliary traveling wave current acquisition module (2-1) acquires current through a traveling wave current sensor; the auxiliary power frequency current acquisition module (2-2) acquires current through a power frequency current sensor; and the auxiliary ground electric field acquisition module (2-3) acquires current through a ground electric field sensor.

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