Overhead line fault detection device and method

Abstract

The invention provides an overhead line fault detection device and method, and relates to the technical field of line fault monitoring. The overhead line fault detection device comprises a current monitoring module which is used for monitoring the current change of an overhead line and generating a current monitoring signal; the electric field monitoring module is used for monitoring the electric field change of the overhead line and generating an electric field monitoring signal; the detection unit and the control unit are used for receiving the current monitoring signal and the electric field monitoring signal and detecting whether the overhead line breaks down or not based on the current monitoring signal and the electric field monitoring signal. According to the technical scheme of the invention, the method does not depend on the current to detect the fault, increases the detection of the electric field as an auxiliary judgment means, comprehensively and comprehensively evaluates the operation state of the overhead line, can avoid the adoption of a blind area of a single monitoring point, improves the reliability of fault monitoring, and reduces the false alarm rate of the fault.

Description

Technical Field

[0001] The present invention relates to the technical field of line fault monitoring, and in particular to an overhead line fault detection device and method. Background Art

[0002] At present, fault indicators for outdoor overhead lines are divided into two categories: (i) current constant value method, which sets a current alarm threshold, such as a 300A alarm threshold. When the line operating current is ≥300A, an alarm will be triggered immediately regardless of the reason; (ii) transient characteristic method, which determines whether a fault has occurred by monitoring the entire process of current mutation during the fault. However, due to the current accuracy limitation of the product itself, this judgment method has a minimum starting current (about 3A). For example, if the current changes from 3A to 200A and then the power is immediately cut off, it is determined that a fault has occurred.

[0003] The methods in the prior art use the current constant value method which is prone to cause false alarms, such as inrush current, reclosing, excitation interference, etc.; and use the transient characteristic method. When the line operating current is relatively low and does not reach more than 3A, the fault indicator cannot start working normally.

[0004] Currently, no effective solution has been proposed for the above-mentioned technical problems. Summary of the invention

[0005] The main purpose of the present invention is to provide an overhead line fault detection device and method to solve the problem in the prior art that the fault cannot be accurately and quickly determined during overhead line fault detection.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an overhead line fault detection device, comprising: a current monitoring module, the current monitoring module is used to monitor the current change of the overhead line and generate a current monitoring signal; an electric field monitoring module, the electric field monitoring module is used to monitor the electric field change of the overhead line and generate an electric field monitoring signal; a detection unit, the detection unit is used to receive the current monitoring signal and the electric field monitoring signal, and detect whether a fault occurs in the overhead line based on the current monitoring signal and the electric field monitoring signal.

[0007] Furthermore, the electric field monitoring module at least includes a ground electric field monitoring module, and the ground electric field monitoring module is used to monitor the change of the electric field between the overhead line and the ground.

[0008] Furthermore, the overhead line fault detection device further comprises: an alarm module, the alarm module being used to issue fault alarm information when a fault occurs in the overhead line.

[0009] Furthermore, the alarm module includes: a flip alarm module, which includes at least a flip sign and a flip mechanism, the flip mechanism is used to drive the flip sign to flip, the flip sign can be flipped to an initial state and a fault indication state, when the flip sign is in the fault indication state, the flip sign sends out the sign alarm information in the fault alarm information.

[0010] Furthermore, the alarm module also includes: a light alarm module, which is used to issue light prompt information in the fault alarm information when a fault occurs in the overhead line.

[0011] Furthermore, the overhead line fault detection device also includes: a communication module, the current monitoring module, the electric field monitoring module, and the alarm module all communicate with the control unit through the communication module; the communication module includes at least one of a wireless communication module and a wired communication module.

[0012] According to another aspect of the present invention, there is provided an overhead line fault detection method, which is performed using the above-mentioned overhead line fault detection device. The method comprises the following steps: acquiring a current monitoring signal and an electric field monitoring signal of the overhead line; and detecting whether a fault occurs in the overhead line based on the current monitoring signal and the electric field monitoring signal.

[0013] Optionally, the method comprises the following steps: when it is determined that an overhead line fails, generating an alarm control instruction, the alarm control instruction being used to control an alarm module to issue a fault alarm message.

[0014] Optionally, the current monitoring signal includes a current mutation signal, and the electric field monitoring signal includes a normal electric field signal. Based on the current monitoring signal and the electric field monitoring signal, determining whether a fault occurs in the overhead line includes the following steps: when it is determined that the electric field is a normal electric field signal and the normal electric field signal lasts for a first preset time length, detecting the current monitoring signal; when it is determined that the current monitoring signal is a current mutation signal and the current mutation signal lasts for a second preset time length, determining that a fault occurs in the overhead line.

[0015] Optionally, the method also includes the following steps: detecting the line voltage of the overhead line, and generating a normal electric field signal when it is determined that the line voltage is within a preset voltage range; and / or detecting the line current of the overhead line, and generating a normal current signal when it is determined that the line current is within a preset current range.

[0016] By applying the technical solution of the present invention, the current detection module can monitor the current changes in the overhead line in real time, generate a current monitoring signal, and transmit the current monitoring signal to the detection unit; the electric field monitoring module can monitor the electric field between the overhead line and the ground in real time, and the electric field monitoring module forms an electric field monitoring signal by capturing the electric field changes, and transmits the electric field monitoring signal to the detection unit; the detection unit combines the detection of current and electric field, no longer relies solely on current to detect faults, and adds electric field detection as an auxiliary judgment method, so as to comprehensively and comprehensively evaluate the operating status of the overhead line, avoid the blind spot of a single monitoring point, improve the reliability of fault monitoring, and reduce the false alarm rate of faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It shows a schematic structural diagram of an embodiment of an overhead line fault detection device according to the present invention;

[0019] Figure 2 A flow chart showing an embodiment of an overhead line fault detection method according to the present invention;

[0020] Figure 3 shows a circuit diagram of an embodiment of a detection unit according to the present invention;

[0021] Figure 4 Shows a time control circuit diagram according to the present invention;

[0022] Figure 5 shows a circuit diagram of an embodiment of an electric field monitoring module according to the present invention;

[0023] Figure 6 A circuit diagram of a first embodiment of a current monitoring module according to the present invention is shown;

[0024] Figure 7 FIG. 2 shows a circuit diagram of a second embodiment of a current monitoring module according to the present invention. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0029] Combination Figure 1 As shown, according to a specific embodiment of the present application, an overhead line fault detection device is provided.

[0030] Specifically, the overhead line fault detection device includes a current monitoring module, an electric field monitoring module and a detection unit. The current monitoring module is used to monitor the current changes of the overhead line and generate a current monitoring signal; the electric field monitoring module is used to monitor the electric field changes of the overhead line and generate an electric field monitoring signal; the detection unit is used to receive the current monitoring signal and the electric field monitoring signal, and detect whether the overhead line has a fault based on the current monitoring signal and the electric field monitoring signal.

[0031] By applying the technical solution of this embodiment, the current detection module can monitor the current changes in the overhead line in real time, generate a current monitoring signal, and transmit the current monitoring signal to the detection unit; the electric field monitoring module can monitor the electric field between the overhead line and the ground in real time, and the electric field monitoring module forms an electric field monitoring signal by capturing the electric field changes, and transmits the electric field monitoring signal to the detection unit; the detection unit combines the detection of current and electric field, no longer relies solely on current to detect faults, and adds electric field detection as an auxiliary judgment method to comprehensively and comprehensively evaluate the operating status of the overhead line, thereby avoiding the blind spots of a single monitoring point, improving the reliability of fault monitoring, and reducing the false alarm rate of faults.

[0032] It should be noted that when a short circuit or other abnormal situation occurs in the line, the current monitoring module can quickly detect abnormal fluctuations in current; under normal circumstances, there is a relatively stable electric field distribution between the overhead line and the ground. When a fault occurs in the overhead line, the electric field distribution will change significantly; the detection unit adopts dual-point monitoring of current and electric field, comprehensive analysis and evaluation, and makes a judgment on whether the overhead line is faulty based on preset logic and algorithms.

[0033] Specifically, the electric field monitoring module includes at least a ground electric field monitoring module, which is used to monitor the electric field changes between the overhead line and the ground. The ground electric field monitoring module can monitor the electric field between the overhead line and the ground in real time in steps, and can timely capture faults such as ground short circuits and insulator flashing, which can significantly improve the sensitivity and range of fault monitoring and improve the safety and stability of the power system.

[0034] Furthermore, the overhead line fault detection device also includes an alarm module, which is used to issue fault alarm information when a fault occurs in the overhead line. The alarm module enables the fault detection device to not only be limited to data monitoring, but also to quickly notify maintenance personnel through an intuitive alarm method, realize a real-time alarm, and a rapid response alarm mechanism, ensure that fault information is quickly communicated, effectively shorten the fault handling time, avoid the impact of power outages on social and economic activities, and improve the reliability of power supply.

[0035] Specifically, the alarm module includes a flip alarm module, which includes at least a flip sign and a flip mechanism, the flip mechanism is used to drive the flip sign to flip, the flip sign can flip to an initial state and a fault indication state, and when the flip sign is in the fault indication state, the flip sign sends out the sign alarm information in the fault alarm information. When the detection unit determines that a fault occurs in the line, the flip mechanism drives the flip sign to flip from the initial state to the fault indication state, sends out an indication alarm information, and prompts the line patrol personnel to pay attention to the occurrence or existence of a fault in the line, so as to deal with the fault in time.

[0036] It should be noted that the flip alarm module can switch the initial state of the flip sign to the fault indication state through the mechanical force of the flip mechanism when there is no power supply. That is, the flip alarm module as an auxiliary or additional alarm device can ensure that the line can still provide fault warnings in the case of power failure or no signal, and can be applied to fault warnings of key power facilities. The mechanical alarm method can ensure the transmission of fault information even in extreme environments and ensure the stability of the alarm module.

[0037] Furthermore, the alarm module also includes a light alarm module, which is used to issue light prompt information in the fault alarm information when a fault occurs in the overhead line. The light alarm module can provide obvious fault warnings at night or in low visibility environments to ensure that maintenance personnel can find faults in time. In one embodiment of the present application, the light alarm module uses LED lights for alarm indication. The LED lights have the characteristics of high brightness, fast response and multiple colors. Different fault types can be indicated by different LED lights' colors, and visual alarm signals can also be issued by flashing or continuously lighting the lights.

[0038] Furthermore, the overhead line fault detection device also includes a communication module, and the current monitoring module, the electric field monitoring module, and the alarm module all communicate with the detection unit through the communication module; the communication module includes at least one of a wireless communication module and a wired communication module. The real-time current monitoring signal generated by the current monitoring module and the electric field monitoring signal generated by the electric field monitoring module are transmitted to the detection unit through the communication module, which can ensure the real-time nature of signal transmission. At the same time, the communication module can also transmit the current monitoring signal and the electric field monitoring signal to the remote control terminal or the cloud. Through remote monitoring, it is ensured that the data is uploaded in time to judge the fault of the overhead line, and the data is stored remotely in time after being uploaded. It can monitor the fault of the overhead lines in remote mountainous areas, lakes and seas, and other areas that cannot be patrolled on a daily basis, thereby improving the safety of the overall power system operation.

[0039] Combination Figure 2 As shown, according to another specific embodiment of the present application, a method for detecting an overhead line fault is also provided. The method is performed using the overhead line fault detection device in the above embodiment, and the method includes the following steps:

[0040] Step S10: obtaining a current monitoring signal and an electric field monitoring signal of an overhead line;

[0041] Specifically, the current monitoring module and the electric field monitoring module in the above embodiment are used to collect current detection signals and electric field monitoring signals. The current monitoring signal includes a real-time signal when the current is normal and an abnormal current fluctuation signal. The electric field monitoring signal includes a stable electric field distribution signal and an abnormal electric field distribution signal.

[0042] Step S12: Detect whether an overhead line fault occurs based on the current monitoring signal and the electric field monitoring signal.

[0043] Specifically, the current monitoring signal and the electric field monitoring signal are analyzed and judged by preset logic and algorithms, or compared with the current monitoring signal and the electric field monitoring signal under normal conditions to determine whether an overhead line fault occurs and what kind of fault occurs.

[0044] Through the above steps, the current monitoring signal and electric field monitoring signal of the overhead line are obtained; based on the current monitoring signal and the electric field monitoring signal, whether the overhead line is faulty is detected. By comprehensively analyzing the current and electric field data, the line fault is effectively identified, and the false alarm or missed alarm caused by a single monitoring method is avoided, thereby improving the accuracy and reliability of fault monitoring, effectively reducing the impact of power failures on social activities, and can be applied to daily maintenance of the power system and emergency fault troubleshooting.

[0045] Optionally, the method further comprises the following steps:

[0046] Step S14: when it is determined that the overhead line fails, an alarm control instruction is generated, and the alarm control instruction is used to control the alarm module to issue a fault alarm message.

[0047] Specifically, the alarm module has the flip alarm module and the light alarm module in the above embodiment, and the fault alarm information includes the signboard alarm information and the light alarm information. The generation of the alarm control instruction ensures that the fault information can be transmitted quickly and the alarm response speed is improved. The fast response mechanism can start the fault handling process in a short time and improve the emergency response capability of the power system.

[0048] Optionally, in step S10, the current monitoring signal includes a current mutation signal, and the electric field monitoring signal includes a normal electric field signal. Based on the current monitoring signal and the electric field monitoring signal, determining whether an overhead line fails includes the following steps:

[0049] Step S101: When it is determined that the electric field is a normal electric field signal and the normal electric field signal lasts for a first preset time, detecting a current monitoring signal;

[0050] Specifically, the first preset time length is a pre-set time length, and the electric field monitoring signal is a stable electric field formed between the overhead line and the ground. When the electric field value is stable for the first preset time length, the normal state of the electric field can be determined.

[0051] Step S102: when it is determined that the current monitoring signal is a current mutation signal and the current mutation signal lasts for a second preset time period, it is determined that a fault occurs in the overhead line.

[0052] Specifically, the second preset time length is a pre-set time length, and at the same time, a sudden current change occurs in the circuit. After the sudden current change lasts for the second preset time length, it can be determined that a fault occurs in the overhead line.

[0053] It should be noted that the current in the overhead lines may fluctuate, or the current may mutate due to inrush current, reclosing, short circuit, lightning, etc. in the circuit. In order to distinguish whether the current mutation is a normal change or a fault causing the current mutation, the mutation value and the second preset time duration of the mutation state can be used to prevent misjudgment of the fault.

[0054] In this embodiment, the first preset time is 20s, the normal electric field is 5700V, the normal current is above 20A, the second preset time is 0.02s-3s, and the current mutation value is above 160A. When the electric field is monitored, the electric field voltage meets the normal voltage requirements and is stable for more than 20s, the normal state of the electric field is determined, and then the current is monitored. When the current mutation value is above 160A, and if the mutation current only maintains the second preset time, it is a current mutation, and it is judged that the overhead line has a fault; if the mutation current maintains for more than the second preset time, the circuit is normal. The dual judgment mechanism of electric field and current can effectively filter out instantaneous interference, ensure the accuracy of fault judgment, and improve the operating efficiency and safety of the power system.

[0055] Optionally, in step S12, the method further includes the following steps:

[0056] Step S121: detecting the line voltage of the overhead line, and generating a normal electric field signal when determining that the line voltage is within a preset voltage range;

[0057] Specifically, the preset voltage is determined according to the length and purpose of the overhead line. By monitoring the electric field of the overhead line, an electric field monitoring signal is generated, and the electric field monitoring signal is analyzed to determine whether the electric field is in a normal state.

[0058] It should be noted that when the electric field monitoring signal does not meet the preset voltage range, it is determined that a fault has occurred or exists in the overhead line; when the electric field monitoring signal meets the preset voltage range and lasts for the first preset time, a normal electric field signal is generated, and then subsequent current monitoring continues.

[0059] Step S122: Detect the line current of the overhead line, and generate a normal electric field signal when it is determined that the line current is within a preset current range.

[0060] Specifically, the preset current is determined according to the length and purpose of the overhead line. By monitoring the current of the overhead line, a current monitoring signal is generated, and the current monitoring signal is analyzed to determine whether the current is in a normal state. By detecting the voltage and current, it is possible to comprehensively judge whether the overhead line is faulty or in a normal state, which can achieve refined management of the power system and high-precision fault monitoring, and improve the operating efficiency and safety of the power system.

[0061] The present application also provides a preferred embodiment of an overhead line fault detection device, which has multiple sensing and alarm functions to ensure that relevant personnel can be notified quickly and accurately when a line fault occurs.

[0062] The overhead line fault detection device includes a current monitoring module, which monitors the current changes in the overhead line in real time. When a short circuit or other abnormal conditions occur in the line, the current monitoring module can quickly detect abnormal fluctuations in the current and transmit the current monitoring signal to the detection unit.

[0063] The electric field monitoring module includes a ground electric field monitoring module, which is used to monitor the changes in the electric field between the line and the ground. Under normal circumstances, there will be a relatively stable electric field distribution between the overhead line and the ground. Once a line fails, the electric field distribution will change significantly. The ground electric field monitoring module can capture these changes and transmit the electric field monitoring signal to the detection unit.

[0064] The detection unit is the core control unit of the entire fault detection device. It is used to receive the current monitoring signal and the electric field monitoring signal transmitted from the current monitoring module and the ground electric field monitoring module, analyze and process the current monitoring signal and the electric field monitoring signal, and judge whether a fault has occurred in the line according to the logic and algorithm stored and preset in the control unit. It decides whether to activate the alarm mechanism.

[0065] The alarm mechanism is activated through the alarm module, which can send out fault alarm information. The alarm module includes a flip alarm module and a light alarm module. When the detection unit determines that a line fault occurs, the flip alarm module is activated and flips from the initial state to the fault indication state, prompting line patrol personnel to pay attention to the fault information; the LED light alarm module uses the high brightness and fast response characteristics of the LED lamp to send out visual alarm signals by flashing or continuously lighting up, which is particularly effective at night or in environments with low visibility, and can quickly attract the attention of maintenance personnel.

[0066] The power supply module provides a stable power supply for the entire fault detection device and adopts a highly reliable design to ensure normal operation under various severe weather conditions.

[0067] The overhead line fault detection device and detection method in the above-mentioned embodiment, through the coordinated work of multiple modules, adopts a dual-point monitoring method, no longer relying solely on current to detect faults, but adding the monitoring of the ground electric field as an auxiliary judgment means, thereby improving the accuracy of fault monitoring, effectively monitoring the line status, and significantly reducing the fault false alarm rate. When a fault occurs, an alarm signal is issued in time, thereby improving the reliability and safety of the power system.

[0068] Combination Figures 3 to 7 As shown, Figures 3 to 7 It is a circuit diagram of each module in the overhead line fault detection device in the above embodiment.

[0069] Among them, Figure 3 As shown, Figure 3 The circuit diagram of the detection unit is shown in FIG. 1 . The detection unit has a central processing unit (CPU) control chip, which is responsible for receiving data from the current detection module, the electric field monitoring module and other sensors, and performing processing, calculation and analysis; Figure 4 As shown, Figure 4 For the time control circuit diagram, by realizing the time synchronization of each signal transmission through the time control circuit, it can also provide an accurate time basis to calculate the duration of the current mutation to determine whether it meets the fault characteristics; Figure 5 This is the circuit diagram of the electric field monitoring module, which uses a capacitive electric field sensor to detect changes in charge distribution to monitor the ground electric field; Figure 6 and Figure 7 The circuit diagram of the current monitoring module for monitoring and judging the starting current and the sudden change current. The detection principle of the overhead line fault detection device and detection method is as follows:

[0070] Step 1: An AC current of 20A or above is detected or an AC voltage of 5700V is detected for a first preset time of more than 20 seconds;

[0071] Among them, the monitoring of current and voltage can be carried out by single monitoring or simultaneous monitoring (single-point monitoring or dual-point monitoring). The 5700V voltage is the normal electric field of the overhead line to be tested, and the 20A current is a very rare situation. When either the voltage or the current meets the above conditions, the current mutation detection and subsequent fault judgment can be started.

[0072] Step 2: Perform current mutation detection. When the current mutation value is monitored to be ≥160A and lasts for a second preset time of 0.02s-3s, the current or electric field is disconnected at the same time, and a fault prompt is given;

[0073] Among them, if step one detects an AC voltage of 5700V, the current in step two can be directly detected from 0A for mutation.

[0074] Step 3: After the fault prompt, re-monitor the current and voltage of the overhead line. When an AC current of more than 20A is detected or an AC voltage of 5700V is detected (either single monitoring or simultaneous monitoring is acceptable), and the voltage or current continues for more than the first preset time of 20s, the fault detection device is reset.

[0075] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0076] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An overhead line fault detection device, characterized in that: include: A current monitoring module, the current monitoring module is used to monitor the current change of the overhead line and generate a current monitoring signal; An electric field monitoring module, the electric field monitoring module is used to monitor the electric field changes of the overhead line and generate an electric field monitoring signal; A detection unit is used to receive the current monitoring signal and the electric field monitoring signal, and detect whether the overhead line fails based on the current monitoring signal and the electric field monitoring signal.

2. The overhead line fault detection device according to claim 1, characterized in that: The electric field monitoring module at least includes a ground electric field monitoring module, and the ground electric field monitoring module is used to monitor the change of the electric field between the overhead line and the ground.

3. The overhead line fault detection device according to claim 1, characterized in that: The overhead line fault detection device also includes: An alarm module is used to issue a fault alarm message when a fault occurs in the overhead line.

4. The overhead line fault detection device according to claim 3, characterized in that: The alarm module comprises: A flip alarm module, the flip alarm module at least includes a flip sign and a flip mechanism, the flip mechanism is used to drive the flip sign to flip, the flip sign can be flipped to an initial state and a fault indication state, when the flip sign is in the fault indication state, the flip sign sends out the sign alarm information in the fault alarm information.

5. The overhead line fault detection device according to claim 3, characterized in that: The alarm module also includes: A light alarm module, wherein the light alarm module is used to issue the light prompt information in the fault alarm information when a fault occurs in the overhead line.

6. The overhead line fault detection device according to claim 3, characterized in that: The overhead line fault detection device also includes: A communication module, through which the current monitoring module, the electric field monitoring module and the alarm module communicate with the detection unit; The communication module includes at least one of a wireless communication module and a wired communication module.

7. A method for detecting an overhead line fault, characterized in that: The method is performed using the overhead line fault detection device described in any one of claims 1 to 6, and the method comprises the following steps: Obtain current monitoring signals and electric field monitoring signals of overhead lines; Based on the current monitoring signal and the electric field monitoring signal, it is detected whether a fault occurs in the overhead line.

8. The overhead line fault detection method according to claim 7, characterized in that: The method comprises the following steps: When it is determined that the overhead line fails, an alarm control instruction is generated, and the alarm control instruction is used to control the alarm module to issue a fault alarm message.

9. The overhead line fault detection method according to claim 7 or 8, characterized in that: The current monitoring signal includes a current mutation signal, and the electric field monitoring signal includes a normal electric field signal. Based on the current monitoring signal and the electric field monitoring signal, determining whether the overhead line has a fault includes the following steps: In the case where it is determined that the electric field is the normal electric field signal and the normal electric field signal lasts for a first preset time length, detecting the current monitoring signal; When it is determined that the current monitoring signal is the current mutation signal and the current mutation signal lasts for a second preset time period, it is determined that a fault occurs in the overhead line.

10. The overhead line fault detection method according to claim 9, characterized in that: The method further comprises the steps of: detecting a line voltage of the overhead line, and generating the electric field normal signal when determining that the line voltage is within a preset voltage range; and / or, The line current of the overhead line is detected, and when it is determined that the line current is within a preset current range, the normal electric field signal is generated.

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