Ground wire strain insulator capable of inhibiting induction current and preventing sparking

Abstract

The invention discloses a ground wire strain insulator capable of inhibiting induced current and preventing sparking, which belongs to the technical field of high-voltage power transmission and comprises an insulating support module, a lightning current discharge module and a safety monitoring module. One end of the insulating support module is connected with a ground wire, and the other end of the insulating support module is connected with a tower; the lightning current discharge module is connected in parallel with two ends of the insulation support module. The insulation supporting module is used for bearing mechanical tension of a ground wire and providing corresponding electrical insulation for the ground wire. The lightning current discharge module is used for conducting when lightning overvoltage on the ground wire is monitored, and discharging lightning current on the ground wire to the ground; and the safety monitoring module is used for monitoring the leakage current and temperature of the lightning current discharge module and evaluating the operation state of the lightning current discharge module, so that the problem that spark discharge is generated by a discharge gap connected in parallel at the two ends of an insulator in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage power transmission, and in particular to a ground wire strain insulator capable of suppressing induced current and preventing sparking. BACKGROUND

[0002] With the establishment of the double carbon goal, the demand for electric energy in China has increased dramatically, and the power transmission line has developed rapidly, gradually forming a regional interconnected large power grid structure. As the main carrier of power energy transmission, overhead power transmission lines play an important role in the composition of the power system. Therefore, the safe operation of the power transmission line is of great significance to the normal operation of the power system.

[0003] In the overhead power transmission line, the overhead ground wire (lightning conductor) is an important part of ensuring the safe operation of the line. However, with the continuous increase of the transmission capacity of the overhead line, the induced voltage and current of the ground wire caused by the large current of the conductor are continuously increasing, and the line energy loss also increases. In the past, in order to suppress the induced current, the ground wire adopts a single-end grounding mode in a strain section, that is, one end is directly grounded, and the other end is provided with a strain insulator, and a discharge gap is connected in parallel at both ends of the insulator to discharge the lightning current when the ground wire is struck by lightning. However, when the current of the conductor is too large, the amplitude of the induced voltage on the ground wire increases, eventually leading to discharge of the parallel gap. On the one hand, the spark discharge is an arc discharge, which can easily affect the safety of the equipment; on the other hand, the continuous sparking accompanied by sound can easily cause panic and complaints from the public. SUMMARY

[0004] The present application provides a ground wire strain insulator capable of suppressing induced current and preventing sparking, which can solve the problem of spark discharge of the discharge gap connected in parallel at both ends of the insulator in the prior art.

[0005] In order to solve the above technical problems, the present application provides a ground wire strain insulator capable of suppressing induced current and preventing sparking, which comprises an insulating support module, a lightning current discharge module and a safety monitoring module. One end of the insulating support module is connected with the ground wire, and the other end is connected with the tower; The lightning current discharge module is connected in parallel at both ends of the insulating support module; The safety monitoring module is connected with the lightning current discharge module; The insulating support module is used to bear the mechanical tension of the ground wire and provide corresponding electrical insulation to the ground wire, thereby reducing the induced current of the ground wire; The lightning current discharge module is used to monitor the voltage on the ground wire and conduct when a lightning overvoltage appears on the ground wire, thereby discharging the lightning current on the ground wire into the ground; The safety monitoring module is configured to monitor the leakage current and temperature of the lightning current discharge module, and evaluate the operation state of the lightning current discharge module according to the leakage current and temperature.

[0006] As a preferred solution, the insulating support module comprises a tension insulator. The tension insulator comprises a core rod and a shed. The core rod is a central axis component throughout the tension insulator, and the shed is an insulating sheath that completely covers the core rod without any gap.

[0007] As a preferred solution, the minimum number of insulator pieces of the tension insulator is: ; ; ; ; Wherein, N is the minimum number of insulator pieces of the tension insulator; is the creepage distance of a single-piece tension insulator; is the minimum total creepage distance required by the tension insulator; is the specific creepage distance; is the induced voltage on the ground wire; is the maximum voltage on the overhead line; k is the coupling coefficient; is the spatial distance between the phase wire and the ground wire; is the distance between the mirror image of the phase wire and the ground wire; h is the average height of the conductor to the ground; r is the radius of the conductor.

[0008] As a preferred solution, the lightning current discharge module comprises a zinc oxide arrester.

[0009] As a preferred solution, the DC reference voltage of the zinc oxide valve piece in the zinc oxide arrester is: ; Wherein, is the DC reference voltage of the zinc oxide valve piece; is the maximum continuous power frequency voltage effective value that may occur on the ground wire; is the safety factor.

[0010] As a preferred solution, the safety monitoring module comprises a leakage current wireless monitoring unit, an RFID temperature tag unit, and an analysis unit. The leakage current wireless monitoring unit is connected in series at the grounding down conductor of the zinc oxide arrester. The RFID temperature tag unit is located on the surface of the external fitting of the zinc oxide arrester. The leakage current wireless monitoring unit is configured to collect leakage current data of the zinc oxide surge arrester and transmit the collected leakage current data to the analysis unit. The RFID temperature tag unit is configured to collect operating temperature data of the zinc oxide surge arrester and transmit the collected operating temperature data to the analysis unit. The analysis unit is configured to evaluate the operating state of the zinc oxide surge arrester according to the leakage current data and the operating temperature data.

[0011] Preferably, the operating temperature data of the zinc oxide surge arrester is collected by: collecting a full current waveform of the zinc oxide surge arrester and obtaining a voltage signal of an operating line; performing fast Fourier transform on the full current waveform and the voltage signal to obtain corresponding current spectrum and voltage spectrum, extracting corresponding current fundamental component from the current spectrum, and extracting corresponding voltage fundamental component from the voltage spectrum; obtaining a phase difference between the full current and the voltage according to the current fundamental component and the voltage fundamental component, and separating a resistive current component with the same phase as the voltage from the full current according to the phase difference, and taking the resistive current component as the operating temperature data of the zinc oxide surge arrester.

[0012] Preferably, the evaluation of the operating state of the zinc oxide surge arrester according to the leakage current data and the operating temperature data comprises: comparing the leakage current data with a preset current threshold, and evaluating the operating state of the zinc oxide surge arrester according to the comparison result of the leakage current data and the current fluctuation of the leakage current data; comparing the operating temperature data with an ambient temperature at a corresponding time, and evaluating the operating state of the zinc oxide surge arrester according to the comparison result of the operating temperature data and the temperature fluctuation of the operating temperature data.

[0013] Preferably, the comparison of the leakage current data with the preset current threshold and the evaluation of the operating state of the zinc oxide surge arrester according to the comparison result of the leakage current data and the current fluctuation of the leakage current data comprises: comparing the leakage current data with the preset current threshold, and when a current difference between the leakage current and the preset current threshold is greater than a preset current difference threshold, judging that the operating state of the zinc oxide surge arrester is unstable and generating a corresponding alarm signal; If the leakage current continuously increases in daily average current in a preset time period, and the cumulative increase exceeds a preset increase threshold, it is determined that the operating state of the zinc oxide surge arrester is unstable and a corresponding alarm signal is generated.

[0014] As a preferred solution, the comparison of the operating temperature data with the ambient temperature at the corresponding time, the evaluation of the operating state of the zinc oxide surge arrester according to the comparison result of the operating temperature data and the temperature fluctuation of the operating temperature data, comprises: The comparison of the operating temperature data with the ambient temperature at the corresponding time, when the temperature difference between the operating temperature data and the ambient temperature at the corresponding time is greater than a preset temperature difference threshold, it is determined that the operating state of the zinc oxide surge arrester is unstable and a corresponding alarm signal is generated. If the temperature change rate of the operating temperature data in any one hour exceeds a preset temperature change rate threshold, or the daily average temperature of the operating temperature data presents a stable rising trend in continuous preset days, it is determined that the operating state of the zinc oxide surge arrester is unstable and a corresponding alarm signal is generated.

[0015] Compared with the prior art, the embodiment of the present application has the following beneficial effects: The application provides a ground wire strain insulator capable of inhibiting induced current and preventing sparking, comprising an insulating support module, a lightning current discharge module and a safety monitoring module; one end of the insulating support module is connected with a ground wire, and the other end is connected with a tower; the lightning current discharge module is connected in parallel at both ends of the insulating support module; the safety monitoring module is connected with the lightning current discharge module; the insulating support module is used for bearing the mechanical tension of the ground wire and providing corresponding electrical insulation for the ground wire, so as to reduce the induced current of the ground wire; the lightning current discharge module is used for monitoring the voltage on the ground wire and conducting when lightning overvoltage appears on the ground wire, so as to discharge the lightning current on the ground wire into the ground; the safety monitoring module is used for monitoring the leakage current and temperature of the lightning current discharge module, and evaluating the operating state of the lightning current discharge module according to the leakage current and the temperature. The lightning current discharge module is used to replace the traditional parallel discharge gap, so that the induced current can be inhibited and the lightning current can be discharged, and spark discharge under the action of induced voltage can be avoided, thereby solving the problem that the spark discharge of the gap of the existing ground wire strain insulator easily causes panic and complaints of the public. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure schematic diagram of a ground wire strain insulator capable of inhibiting induced current and preventing sparking provided by an embodiment of the application. DETAILED DESCRIPTION

[0017] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in this specification and the appended claims are intended to be open-ended, and do not exclude other additives, components, elements or steps.

[0019] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0020] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification are not necessarily all referring to the same embodiment, or are necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects.

[0022] In the description of the embodiments of the present application, the terms "a plurality of", "several" refer to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0023] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0024] Example 1 Please refer to Figure 1 To address the problem of spark discharge caused by the parallel discharge gap at both ends of an insulator in the prior art, an embodiment of the present invention provides a schematic diagram of the structure of a ground wire tension insulator that suppresses induced current and prevents arcing, comprising: an insulation support module, a lightning current discharge module, and a safety monitoring module. One end of the insulating support module is connected to the ground wire, and the other end is connected to the tower; The lightning current discharge module is connected in parallel at both ends of the insulating support module; The safety monitoring module is connected to the lightning current discharge module; The insulating support module is used to bear the mechanical tension of the ground wire and provide corresponding electrical insulation to the ground wire to reduce the induced current in the ground wire; The lightning current discharge module is used to monitor the voltage on the ground wire. When a lightning overvoltage is detected on the ground wire, it is turned on to discharge the lightning current on the ground wire to the ground. The safety monitoring module is used to monitor the leakage current and temperature of the lightning current discharge module, and to evaluate the operating status of the lightning current discharge module based on the leakage current and temperature.

[0025] Preferably, the insulation support module includes: a tension insulator; the tension insulator includes: a core rod and a skirt; the core rod serves as a central axis component that runs through the entire tension insulator; the skirt serves as an insulating sheath that completely wraps around the core rod column and has no gap between it and the core rod.

[0026] Preferably, the minimum number of insulator discs in the tension insulator is: ; ; ; ; Where N is the minimum number of insulator discs required for a tension insulator; This refers to the creepage distance of a single tension insulator. This refers to the minimum total creepage distance required for tension insulators; For creepage distance; This is the induced voltage on the ground wire; is the maximum voltage on the overhead line; k is the coupling coefficient; This is the spatial distance between the phase wire and the ground wire; is the distance between the mirror images of the phase line and the ground line; h is the average height of the conductor above ground; r is the conductor radius.

[0027] Preferably, the lightning current discharge module includes a zinc oxide surge arrester.

[0028] Preferably, the DC reference voltage of the zinc oxide varistor in the zinc oxide surge arrester is: ; in, This is the DC reference voltage for the zinc oxide valve plate; This represents the maximum effective value of the continuous power frequency voltage that may occur on the ground wire. This is for the safety factor.

[0029] Preferably, the safety monitoring module includes: a leakage current wireless monitoring unit, an RFID temperature tag unit, and an analysis unit; the leakage current wireless monitoring unit is connected in series at the grounding lead of the zinc oxide arrester; the RFID temperature tag unit is located on the surface of the external hardware of the zinc oxide arrester; the leakage current wireless monitoring unit is used to collect leakage current data of the zinc oxide arrester and transmit the collected leakage current data to the analysis unit; the RFID temperature tag unit is used to collect operating temperature data of the zinc oxide arrester and transmit the collected operating temperature data to the analysis unit; the analysis unit is used to evaluate the operating status of the zinc oxide arrester based on the leakage current data and the operating temperature data.

[0030] Preferably, the step of collecting the operating temperature data of the zinc oxide surge arrester includes: collecting the full current waveform of the zinc oxide surge arrester and acquiring the voltage signal of the operating line; performing a fast Fourier transform on the full current waveform and voltage signal to obtain the corresponding current spectrum and voltage spectrum, and extracting the corresponding fundamental current component from the current spectrum and the corresponding fundamental voltage component from the voltage spectrum; obtaining the phase difference between the full current and voltage based on the fundamental current component and the fundamental voltage component, and separating the resistive current component with the same phase as the voltage from the full current based on the phase difference, and using the resistive current component as the operating temperature data of the zinc oxide surge arrester.

[0031] Preferably, the step of evaluating the operating status of the zinc oxide surge arrester based on the leakage current data and operating temperature data includes: comparing the leakage current data with a preset current threshold, and evaluating the operating status of the zinc oxide surge arrester based on the comparison result and the current fluctuation of the leakage current data; comparing the operating temperature data with the ambient temperature at the corresponding time, and evaluating the operating status of the zinc oxide surge arrester based on the comparison result and the temperature fluctuation of the operating temperature data.

[0032] Preferably, the step of comparing the leakage current data with a preset current threshold and evaluating the operating status of the zinc oxide surge arrester based on the comparison result and the current fluctuation of the leakage current data includes: comparing the leakage current data with a preset current threshold; when the current difference between the leakage current and the preset current threshold is greater than a preset current difference threshold, determining that the operating status of the zinc oxide surge arrester is unstable and generating a corresponding alarm signal; if the average daily current of the leakage current continues to rise within a preset time period, and the cumulative increase exceeds a preset increase threshold, determining that the operating status of the zinc oxide surge arrester is unstable and generating a corresponding alarm signal.

[0033] Preferably, the step of comparing the operating temperature data with the ambient temperature at the corresponding time, and evaluating the operating status of the zinc oxide surge arrester based on the comparison result and the temperature fluctuation of the operating temperature data, includes: comparing the operating temperature data with the ambient temperature at the corresponding time; when the temperature difference between the operating temperature data and the ambient temperature at the corresponding time is greater than a preset temperature difference threshold, determining that the operating status of the zinc oxide surge arrester is unstable and generating a corresponding alarm signal; if the temperature change rate of the operating temperature data exceeds a preset temperature change rate threshold in any hour, or if the daily average temperature of the operating temperature data shows a stable upward trend within a consecutive preset number of days, determining that the operating status of the zinc oxide surge arrester is unstable and generating a corresponding alarm signal.

[0034] In one specific embodiment, addressing the issues of slow response speed and potential public panic caused by spark discharge in existing ground wire suspension clamps, this invention provides a ground wire tension insulator capable of suppressing induced current and preventing arcing. This improves the response rate to ground wire short-circuit faults while avoiding public panic, providing guidance for engineering practice. The insulator includes the following components: 1. Insulation support module: One end of this module is connected to the ground wire, and the other end is connected to the tower. It bears the mechanical tension of the ground wire and provides electrical insulation, while reducing the induced current in the ground wire. This component fixes the ground wire to the tower. Its structure is the same as the ground wire suspension clamp before the improvement. It can firmly fix the ground wire to the tower while maintaining good electrical contact with both.

[0035] 2. Lightning current discharge module: This module is integrated with the insulating support component and is permanently connected in parallel between the ground wire and the tower; the lightning current discharge module is used to quickly conduct when a lightning overvoltage (induced lightning overvoltage / direct lightning overvoltage) is detected on the ground wire, and discharge the lightning current to the ground.

[0036] 3. Safety monitoring module: This module ensures the thermal stability and aging issues of the lightning current discharge module during long-term operation, monitors the safety of the lightning current discharge module, and evaluates its operating status in real time.

[0037] Specifically, the insulation support module is a tension insulator. The tension insulator adopts a classic structure, with its core load-bearing component being a core rod made of epoxy resin-impregnated fiber. This core rod is entirely covered by a high-temperature vulcanized silicone rubber shed formed through a molding process. The shed consists of alternating large and small umbrella discs to optimize creepage distance and self-cleaning performance. The core rod, as the central axis component, runs through the entire insulator, and its two ends are firmly connected to metal end fittings through a crimping process. The shed acts as an insulating sheath, completely enclosing the core rod column without any gaps between them. In terms of overall spatial layout, the insulation unit composed of the core rod and shed is located between the ground wire side fittings and the tower side fittings, forming a complete force-bearing and insulation channel of "ground wire - ground wire side fittings - core rod / shed assembly - tower side fittings - tower".

[0038] The calculation method for the induced voltage on the ground wire is based on Maxwell's potential coefficient method, and the coupling coefficient k is calculated as follows: (1) in, This is the spatial distance between the phase wire and the ground wire; is the distance between the mirror images of the phase line and the ground line; h is the average height of the conductor above ground; r is the conductor radius.

[0039] After obtaining the coupling coefficient, we can calculate the induced voltage on the ground wire using the coupling coefficient. .

[0040] (2) in, This represents the maximum voltage on the overhead line.

[0041] Then, the required creepage distance for the insulator is calculated. .

[0042] (3) in, For the required minimum total creepage distance, The creepage distance is measured in mm / kV and is determined by the pollution level of the line.

[0043] According to IEC 60815, the commonly used creepage distance requirements are listed in Table 1 below. Table 1 Commonly Used Creepage Distance Ratios Subsequently, the relevant insulator product manuals were consulted to calculate the minimum number of insulator discs N required.

[0044] (4) in, This indicates the creepage distance of a single insulator, which is generally between 400mm and 450mm. This means rounding x up.

[0045] Specifically, the lightning current discharge module mainly consists of zinc oxide surge arresters. Once an overvoltage occurs on the ground wire, the surge arrester is quickly triggered to discharge current and protect the overhead line. In this invention, the DC reference voltage of the ZnO varistor in the zinc oxide surge arrester... for: (5) in, This represents the maximum effective value of the continuous power frequency voltage that may occur on the ground wire. For safety, a factor of 3 to 4 is generally chosen. Simultaneously, the surge arrester should use ZnO varistors with the lowest possible residual voltage to better limit overvoltage.

[0046] Specifically, the safety monitoring module is designed to address the potential aging of surge arresters. Therefore, it is necessary to monitor the surge arresters in real time to ensure that they can be triggered at the set voltage. At the same time, the residual voltage after triggering can ensure the safe operation of the line. It includes a leakage current wireless monitoring unit, an RFID temperature tag unit, and an analysis unit.

[0047] To further monitor the status of surge arresters in real time, this invention can connect a milliammeter in series with the grounding down conductor or install a wireless leakage current monitoring unit to monitor its resistive current. Once an abnormal increase in leakage current is detected, an early warning can be issued, and maintenance can be scheduled. Simultaneously, RFID temperature tags are installed on the external hardware of the surge arrester to measure its operating temperature in real time, serving as a basis for judging its thermal stability.

[0048] The leakage current wireless monitoring unit acquires the full current waveform by connecting a high-precision current sensor in series at the grounding lead of the surge arrester, and simultaneously acquires a reference voltage signal from the operating line. It then uses a Fast Fourier Transform (FFT) to perform vector operations on the fundamental component, comparing the phase difference between the current and voltage to accurately separate the resistive current component that is in phase with the voltage from the full current. (For example, if the FFT calculates the fundamental voltage vector as U∠0° and the fundamental current vector as I∠θ°, then the resistive current component is Icosθ.) The RFID temperature tag unit adopts a passive UHF design. It is tightly attached to the surface of the surge arrester's metal flange with a high-temperature resistant adhesive. The radio frequency signal emitted by the RFID reader installed on the tower provides energy to activate its built-in temperature sensor to perform measurement. The measured temperature data is wirelessly transmitted back to the reader via backscatter modulation technology, and then uploaded to the monitoring system, thereby realizing direct, passive, and wireless measurement of the surge arrester's operating temperature.

[0049] The leakage current monitoring method involves installing a wireless leakage current monitoring unit at the grounding down conductor to monitor the total current and resistive current components of the surge arrester in real time. The wireless monitoring unit collects data through a current sensor and transmits the data to the backend monitoring system using LoRa communication technology.

[0050] The status assessment of leakage current is based on its absolute value and trend. An alarm threshold for leakage current is set at 150% of the initial value. When the resistive current exceeds 50% of the initial value, the system issues a warning; when it exceeds 100%, immediate maintenance is recommended. Simultaneously, the monitoring system analyzes historical data. If the daily average leakage current continues to rise for seven consecutive days, with a cumulative increase exceeding 35%, it is determined that immediate maintenance is required. However, if the monitored current amplitude rises sharply from the normal level (mA level) to over 1A within 0.1μs to 1ms, and then decays back down, this event is considered a lightning strike event and not a fault.

[0051] The temperature monitoring method is as follows: RFID temperature tags are installed on the external hardware of the surge arrester to measure its operating temperature in real time. The RFID temperature tag has a built-in temperature sensor that collects temperature data every minute and transmits it to the monitoring system through an RFID reader (installed on the tower).

[0052] Temperature status assessment is based on the relative value of the surge arrester temperature to the ambient temperature and the fluctuation value of the surge arrester temperature. During periods without surge arrester discharge records (hereinafter referred to as steady state), an alarm is issued when the surface temperature of the surge arrester exceeds the ambient temperature by 30°C; simultaneously, temperature fluctuations are monitored, and if the temperature change rate exceeds 10°C in any hour, the thermal stability of the surge arrester is checked. If the daily average temperature shows a stable upward trend over 30 consecutive days, maintenance is considered necessary. When the leakage current monitoring module detects a lightning current discharge event, the system activates the transient temperature monitoring mode. In this mode, a significant temperature increase is allowed within 15 minutes after the action. However, if the temperature fails to recover to the acceptable temperature range during steady state within one hour after the action ends, immediate maintenance is considered required.

[0053] Therefore, this invention provides a ground wire tension insulator that suppresses induced current and prevents sparking, comprising an insulation support module, a lightning current discharge module, and a safety monitoring module. The insulation support module bears mechanical tension and provides electrical insulation; the lightning current discharge module is a zinc oxide surge arrester connected in parallel across the tension insulator to quickly conduct and discharge current when the ground wire is struck by lightning; the safety monitoring module monitors the arrester's status in real time. The core of this invention lies in replacing the traditional parallel discharge gap with a surge arrester, which suppresses induced current and discharges lightning current without generating spark discharge under induced voltage, thus solving the problem of public panic and complaints caused by sparking discharge in existing ground wire tension insulator gaps.

[0054] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A ground wire tension insulator that suppresses induced current and prevents arcing, characterized in that, include: Insulation support module, lightning current discharge module, and safety monitoring module; One end of the insulating support module is connected to the ground wire, and the other end is connected to the tower; The lightning current discharge module is connected in parallel at both ends of the insulating support module; The safety monitoring module is connected to the lightning current discharge module; The insulating support module is used to bear the mechanical tension of the ground wire and provide corresponding electrical insulation to the ground wire to reduce the induced current in the ground wire; The lightning current discharge module is used to monitor the voltage on the ground wire. When a lightning overvoltage is detected on the ground wire, it is turned on to discharge the lightning current on the ground wire to the ground. The safety monitoring module is used to monitor the leakage current and temperature of the lightning current discharge module, and to evaluate the operating status of the lightning current discharge module based on the leakage current and temperature.

2. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 1, characterized in that, The insulation support module includes: a tension insulator; The tension insulator includes: a core rod and a skirt; The core rod serves as the central axis component, running through the entire tension insulator; the shed skirts serve as insulating sheaths, completely enclosing the core rod column and having no gaps between them.

3. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 2, characterized in that, The minimum number of insulator discs required for the tension insulator is: ； ； ； ； Where N is the minimum number of insulator discs required for a tension insulator; This refers to the creepage distance of a single tension insulator. This refers to the minimum total creepage distance required for tension insulators; For creepage distance; This is the induced voltage on the ground wire; is the maximum voltage on the overhead line; k is the coupling coefficient; This is the spatial distance between the phase wire and the ground wire; is the distance between the mirror images of the phase line and the ground line; h is the average height of the conductor above ground; r is the conductor radius.

4. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 3, characterized in that, The lightning current discharge module includes a zinc oxide surge arrester.

5. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 4, characterized in that, The DC reference voltage of the zinc oxide valve plate in the zinc oxide surge arrester is: ； in, This is the DC reference voltage for the zinc oxide valve plate; This represents the maximum effective value of the continuous power frequency voltage that may occur on the ground wire. This is for the safety factor.

6. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 5, characterized in that, The safety monitoring module includes: a leakage current wireless monitoring unit, an RFID temperature tag unit, and an analysis unit; The leakage current wireless monitoring unit is connected in series at the grounding lead of the zinc oxide surge arrester; The RFID temperature tag unit is located on the surface of the external hardware of the zinc oxide surge arrester; The leakage current wireless monitoring unit is used to collect leakage current data of the zinc oxide surge arrester and transmit the collected leakage current data to the analysis unit. The RFID temperature tag unit is used to collect the operating temperature data of the zinc oxide surge arrester and transmit the collected operating temperature data to the analysis unit. The analysis unit is used to evaluate the operating status of the zinc oxide surge arrester based on the leakage current data and operating temperature data.

7. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 6, characterized in that, The collection of operating temperature data for the zinc oxide surge arrester includes: The full current waveform of the zinc oxide surge arrester is collected, and the voltage signal of the operating line is obtained; Perform a fast Fourier transform on the full current waveform and voltage signal to obtain the corresponding current spectrum and voltage spectrum, and extract the corresponding current fundamental component from the current spectrum and the corresponding voltage fundamental component from the voltage spectrum; Based on the fundamental components of the current and voltage, the phase difference between the total current and the voltage is obtained, and a resistive current component with the same phase as the voltage is separated from the total current based on the phase difference. The resistive current component is used as the operating temperature data of the zinc oxide surge arrester.

8. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 7, characterized in that, The evaluation of the operating status of the zinc oxide surge arrester based on the leakage current data and operating temperature data includes: The leakage current data is compared with a preset current threshold, and the operating status of the zinc oxide surge arrester is evaluated based on the comparison results and the current fluctuation of the leakage current data. The operating temperature data is compared with the ambient temperature at the corresponding time. Based on the comparison results and the temperature fluctuation of the operating temperature data, the operating status of the zinc oxide surge arrester is evaluated.

9. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 8, characterized in that, The step of comparing the leakage current data with a preset current threshold and evaluating the operating status of the zinc oxide surge arrester based on the comparison results and the current fluctuation of the leakage current data includes: The leakage current data is compared with a preset current threshold. When the difference between the leakage current and the preset current threshold is greater than the preset current difference threshold, the operating state of the zinc oxide surge arrester is determined to be unstable and a corresponding alarm signal is generated. If the leakage current continues to rise within a preset time period and the cumulative increase exceeds a preset increase threshold, the operation of the zinc oxide surge arrester is deemed unstable and a corresponding alarm signal is generated.

10. The ground wire tension insulator for suppressing induced current and preventing arcing as described in claim 9, characterized in that, The step of comparing the operating temperature data with the ambient temperature at the corresponding time, and evaluating the operating status of the zinc oxide surge arrester based on the comparison results and temperature fluctuations of the operating temperature data, includes: The operating temperature data is compared with the ambient temperature at the corresponding time. When the temperature difference between the operating temperature data and the ambient temperature at the corresponding time is greater than the preset temperature difference threshold, the operating state of the zinc oxide surge arrester is determined to be unstable and a corresponding alarm signal is generated. If the temperature change rate of the operating temperature data exceeds the preset temperature change rate threshold in any hour, or if the daily average temperature of the operating temperature data shows a stable upward trend within a preset number of consecutive days, the operating state of the zinc oxide surge arrester is determined to be unstable and a corresponding alarm signal is generated.

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