Zinc oxide lightning arrester integrating wireless power transmission and its performance detection method

Abstract

The present invention provides a zinc oxide lightning arrester integrated with wireless power transmission and a performance testing method thereof. The zinc oxide lightning arrester includes an arrester body with multiple shed structures. An energy transmitting coil, an energy receiving coil, and at least one relay coil are integrally formed in the arrester body. The energy transmitting coil is located in the shed structure at one end of the arrester body and is connected to the transmitting coil compensation capacitor to lead outward with a transmitting terminal wiring tap. The energy receiving coil is located in the shed structure at the other end of the arrester body and is connected to the receiving coil compensation capacitor to lead outward with a receiving terminal wiring tap. At least one relay coil is arranged corresponding to the position of the other sheds and forms a series circuit with the corresponding relay compensation capacitor. The effect is that: there is no need for staff to carry additional testing equipment and power supply, the test is convenient, and the performance of the zinc oxide lightning arrester can be directly determined by monitoring the energy transfer state of the wireless power transmission system.

Description

Technical Field

[0001] The present invention relates to zinc oxide lightning arrester technology, and in particular to a zinc oxide lightning arrester integrating wireless power transmission and a performance detection method thereof. Background Art

[0002] Compared to traditional arresters, zinc oxide arresters lack a discharge gap and instead utilize the nonlinear characteristics of zinc oxide to provide current dissipation and interruption, making them important applications in power grids. However, due to environmental pollution, internal moisture, and valve aging, zinc oxide arrester performance can deteriorate, making it essential to test and evaluate their condition.

[0003] Live testing of zinc oxide lightning arresters is an important component of testing and evaluation. However, traditional live testing methods require workers to bring their own power supply and related test equipment, and there is a risk of electric shock during the test. Therefore, designing a new live testing method to ensure worker safety is an urgent issue. Summary of the Invention

[0004] Based on the above requirements, the primary purpose of the present invention is to propose a zinc oxide lightning arrester integrated with wireless power transmission, so as to solve the potential safety hazards that may arise from the live testing of the zinc oxide lightning arrester.

[0005] In order to achieve the above object, the specific technical solutions adopted by the present invention are as follows:

[0006] A zinc oxide lightning arrester integrating wireless power transmission comprises an arrester main body with multiple shed structures. The key lies in that an energy transmitting coil, an energy receiving coil and at least one relay coil are integrally formed in the arrester main body. A transmitting coil compensation capacitor, a receiving coil compensation capacitor and relay compensation capacitors corresponding to the number of the relay coils are also integrally formed in the arrester main body. The energy transmitting coil is located in the shed structure at one end of the arrester main body and is connected to the transmitting coil compensation capacitor to lead out a transmitting terminal wiring tap. The energy receiving coil is located in the shed structure at the other end of the arrester main body and is connected to the receiving coil compensation capacitor to lead out a receiving terminal wiring tap. The at least one relay coil is arranged corresponding to the position of the other sheds and forms a series circuit with the corresponding relay compensation capacitor.

[0007] Optionally, at least one of the transmitting coil compensation capacitor, the receiving coil compensation capacitor and the relay compensation capacitor is a plate capacitor, and the zinc oxide of the arrester body is used as at least a part of the medium of the plate capacitor.

[0008] Optionally, the relay coils are evenly arranged according to the number of sheds between the energy transmitting coil and the energy receiving coil.

[0009] Optionally, an inverter is connected to the transmitting terminal connection tap, a primary rectifier is connected to the input end of the inverter, and the input end of the primary rectifier draws power from the power line through a CT energy taking device.

[0010] Optionally, a secondary rectifier is connected to the receiving end wiring tap, and output ends of the secondary rectifier respectively power the current acquisition module and the voltage acquisition module.

[0011] Optionally, the sampling end of the current acquisition module is connected to the arrester body for acquiring the current signal of the arrester body, and the sampling end of the voltage acquisition module is connected to the arrester body for acquiring the voltage signal of the arrester body.

[0012] Optionally, the sampling end of the current acquisition module is connected to the energy receiving coil for acquiring the current signal picked up by the energy receiving coil, and the sampling end of the voltage acquisition module is connected to the energy receiving coil for acquiring the voltage signal picked up by the energy receiving coil.

[0013] Optionally, the current acquisition module and the voltage acquisition module send the acquired signals to a processing unit, and the processing unit is connected to a host computer via a wireless communication module.

[0014] In addition, the present invention also proposes a performance detection method for a zinc oxide lightning arrester integrated with wireless power transmission, which adopts the zinc oxide lightning arrester described above, and the key lies in comprising the following steps:

[0015] S1: Output a first high-frequency excitation signal of frequency f0 to the energy transmitting coil through the inverter; collect the pickup voltage u1 and pickup current i1 of the energy receiving coil and obtain the voltage-current phase difference θ1;

[0016] S2: Output a second high-frequency excitation signal of frequency f0+Δf to the energy transmitting coil through the inverter; collect the pickup voltage u2 and pickup current i2 of the energy receiving coil and obtain the voltage and current phase difference θ2;

[0017] S3: Outputting a third high-frequency excitation signal of frequency f0-Δf to the energy transmitting coil through the inverter; collecting the pickup voltage u3 and pickup current i3 of the energy receiving coil and obtaining the voltage-current phase difference θ3;

[0018] S4: Determine whether at least one of the changes Δu1, Δu2, Δi1, Δi2, Δθ1, and Δθ2 exceeds a corresponding preset threshold. If so, it is considered that the performance of the zinc oxide lightning arrester is impaired.

[0019] Among them: Δu1=u1-u2, Δu2=u1-u3, Δi1=i1-i2, Δi2=i1-i3, Δθ1=θ1-θ2, Δθ2=θ1-θ3, Δf is the preset frequency deviation, and f0 is the resonant frequency of the resonant circuit composed of each compensation capacitor and the corresponding coil under normal performance of the zinc oxide lightning arrester.

[0020] Optionally, in step S4, it is determined whether the changes Δu1, Δu2, Δi1, Δi2, Δθ1, and Δθ2 exceed corresponding preset thresholds. When at least three of the six changes exceed corresponding preset thresholds, it is considered that the performance of the zinc oxide lightning arrester is impaired.

[0021] The effects of the present invention are:

[0022] (1) The present invention does not require staff to carry additional testing equipment and power supplies to the site. The leakage current, resistive current component, and capacitive current component of the zinc oxide lightning arrester during live operation can be directly obtained on the host computer, thereby completing the status evaluation of the zinc oxide lightning arrester during live operation.

[0023] (2) In addition to being used to power the acquisition module, the wireless power supply system of the present invention can also be used to power other devices around the lightning arrester, such as sensors, monitors, etc.;

[0024] (3) The present invention can also determine the performance of the zinc oxide lightning arrester by directly monitoring the energy transfer state of the wireless power transmission system, making the test more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0026] Figure 1 It is a structural diagram of a specific embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0028] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0029] like Figure 1As shown, this embodiment provides a zinc oxide lightning arrester integrating wireless power transmission, including a lightning arrester body with multiple umbrella skirt structures, in which an energy transmitting coil, an energy receiving coil and at least one relay coil are integrally formed in the lightning arrester body, and a transmitting coil compensation capacitor, a receiving coil compensation capacitor and relay compensation capacitors corresponding to the number of relay coils are also integrally formed in the lightning arrester body. The energy transmitting coil is located in the umbrella skirt structure at one end of the lightning arrester body and is connected to the transmitting coil compensation capacitor. A transmitting end wiring tap is led outwardly, and the energy receiving coil is located in the umbrella skirt structure at the other end of the lightning arrester body and is connected to the receiving coil compensation capacitor. A receiving end wiring tap is led outwardly, and the at least one relay coil is arranged corresponding to the position of the other umbrella skirts and forms a series circuit with the corresponding relay compensation capacitor.

[0030] pass Figure 1 It can be seen that as an embodiment, each shed of the zinc oxide lightning arrester WG is embedded with an energy transmitting coil L P , relay coil L R1 、L R2 、……、L R(n-1) 、L Rn and the energy receiving coil L S The relay coils are evenly arranged according to the number of sheds between the energy transmitting coil and the energy receiving coil. The number n of relay coils is determined by the number of sheds of the zinc oxide lightning arrester WG, the power required by the voltage acquisition module and the current acquisition module, the efficiency of the wireless power supply device, and other conditions. The transmitting end wiring tap is connected to an inverter IN, and the input end of the inverter IN is connected to a primary rectifier Re1. The input end of the primary rectifier Re1 draws power from the power line PL through a CT energy acquisition device. The receiving end wiring tap is connected to a secondary rectifier Re2, and the output end of the secondary rectifier Re2 supplies power to the current acquisition module and the voltage acquisition module respectively. The sampling end of the current acquisition module is connected to the lightning arrester body for collecting the current signal of the lightning arrester body. The sampling end of the voltage acquisition module is connected to the lightning arrester body for collecting the voltage signal of the lightning arrester body. The current acquisition module and the voltage acquisition module send the collected signals to a processing unit, and the processing unit is connected to a host computer via a wireless communication module.

[0031] The zinc oxide lightning arrester in this embodiment can power devices such as the voltage acquisition module, the current acquisition module, the processing unit and the wireless communication module by integrating the wireless power transmission system, thereby realizing the live detection of the zinc oxide lightning arrester. Without the need to configure a power supply module separately, the leakage current, resistive current component and capacitive current component of the zinc oxide lightning arrester when it is energized can be obtained directly on the host computer. The status evaluation of the zinc oxide lightning arrester when it is energized can be completed according to conventional analysis methods.

[0032] As another embodiment, at least one of the transmitting coil compensation capacitor, the receiving coil compensation capacitor and the relay compensation capacitor adopts a plate capacitor, and the zinc oxide of the lightning arrester body is used as at least a part of the medium in the plate capacitor. When the use time of the zinc oxide lightning arrester increases, the dielectric constant of the lightning arrester body itself will change, thereby causing the equivalent capacitance of each supplementary capacitor to change, and even changing the self-inductance coefficient of each resonant coil, thereby affecting the energy transfer effect of the system. Therefore, in this embodiment, the sampling end of the current acquisition module is connected to the energy receiving coil for collecting the current signal picked up by the energy receiving coil, and the sampling end of the voltage acquisition module is connected to the energy receiving coil for collecting the voltage signal picked up by the energy receiving coil. The energy transfer system can be powered by various sensing devices, and various sensing devices are directly used to monitor the energy transmission effect of the energy transmission system. By comparing the energy transmission effect of the initial state of the lightning arrester body, it can be determined whether the performance of the zinc oxide lightning arrester is damaged, and the control is more convenient.

[0033] In the specific implementation process, the energy transmitting coil L P , relay coil L R1 , L R2 、……、L R(n-1) , L Rn and the energy receiving coil L S The material, size and number of turns are all the same. The self-inductance coefficient of each coil in the initial state is the same. At the same time, the equivalent capacitance of the transmitting coil compensation capacitor, the receiving coil compensation capacitor and the relay compensation capacitor corresponding to the number of relay coils in the initial state is also the same. The natural resonant frequency of the transmitting end resonant circuit, the relay circuit and the receiving end resonant circuit in the initial state is also the same and is set to f0.

[0034] Based on the above design, this embodiment also provides a performance detection method for a zinc oxide lightning arrester integrated with wireless power transmission, using the zinc oxide lightning arrester described above, including the following steps:

[0035] S1: Output a first high-frequency excitation signal of frequency f0 to the energy transmitting coil through the inverter; collect the pickup voltage u1 and pickup current i1 of the energy receiving coil and obtain the voltage-current phase difference θ1;

[0036] S2: Output a second high-frequency excitation signal of frequency f0+Δf to the energy transmitting coil through the inverter; collect the pickup voltage u2 and pickup current i2 of the energy receiving coil and obtain the voltage and current phase difference θ2;

[0037] S3: Outputting a third high-frequency excitation signal of frequency f0-Δf to the energy transmitting coil through the inverter; collecting the pickup voltage u3 and pickup current i3 of the energy receiving coil and obtaining the voltage-current phase difference θ3;

[0038] S4: Determine whether at least one of the changes Δu1, Δu2, Δi1, Δi2, Δθ1, and Δθ2 exceeds a corresponding preset threshold. If so, it is considered that the performance of the zinc oxide lightning arrester is impaired.

[0039] Among them: Δu1=u1-u2, Δu2=u1-u3, Δi1=i1-i2, Δi2=i1-i3, Δθ1=θ1-θ2, Δθ2=θ1-θ3, Δf is the preset frequency deviation, and f0 is the resonant frequency of the resonant circuit composed of each compensation capacitor and the corresponding coil under normal performance of the zinc oxide lightning arrester.

[0040] By testing the energy transfer effects at different frequency points respectively, the impact of the performance changes of the zinc oxide lightning arrester on the energy transfer effect of the wireless power transmission system can be comprehensively determined, thereby realizing the performance test of the zinc oxide lightning arrester.

[0041] As another embodiment, in step S4, it can be determined whether the changes Δu1, Δu2, Δi1, Δi2, Δθ1, and Δθ2 exceed the corresponding preset thresholds. When at least three of the six changes exceed the corresponding preset thresholds, it is considered that the performance of the zinc oxide lightning arrester is impaired.

[0042] From the above, it can be seen that the zinc oxide lightning arrester integrated with wireless power transmission and its performance detection method proposed in the present invention can use the wireless power transmission system to power various sensors, monitors and other equipment configured on the zinc oxide lightning arrester. It can not only realize live monitoring according to conventional monitoring methods, but also directly realize performance detection based on the impact of changes in the performance of the zinc oxide lightning arrester on the transmission effect of the wireless power transmission system itself, thereby improving the convenience of live detection of the zinc oxide lightning arrester.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and such changes should be included in the scope of the claims and description of the present invention.

Claims

1. A performance testing method for a zinc oxide lightning arrester integrating wireless power transmission, the zinc oxide lightning arrester comprising an arrester body with a plurality of shed structures, wherein an energy transmitting coil, an energy receiving coil and at least one relay coil are integrally formed in the arrester body, and a transmitting coil compensation capacitor, a receiving coil compensation capacitor and relay compensation capacitors corresponding to the number of the relay coils are also integrally formed in the arrester body, the energy transmitting coil is located in the shed structure at one end of the arrester body and is connected to the transmitting coil compensation capacitor to lead outwardly to a transmitting terminal wiring tap, the energy receiving coil is located in the shed structure at the other end of the arrester body and is connected to the receiving coil compensation capacitor to lead outwardly to a receiving terminal wiring tap, the at least one relay coil is arranged corresponding to the position of the other sheds and forms a series circuit with the corresponding relay compensation capacitor, characterized in that: Performance testing includes the following steps: S1: Output a first high-frequency excitation signal of frequency f0 to the energy transmitting coil through the inverter; collect the pickup voltage u1 and pickup current i1 of the energy receiving coil and obtain the voltage-current phase difference θ1; S2: Output a second high-frequency excitation signal of frequency f0+Δf to the energy transmitting coil through the inverter; collect the pickup voltage u2 and pickup current i2 of the energy receiving coil and obtain the voltage and current phase difference θ2; S3: Outputting a third high-frequency excitation signal of frequency f0-Δf to the energy transmitting coil through the inverter; collecting the pickup voltage u3 and pickup current i3 of the energy receiving coil and obtaining the voltage-current phase difference θ3; S4: Determine whether at least one of the changes Δu1, Δu2, Δi1, Δi2, Δθ1, and Δθ2 exceeds a corresponding preset threshold. If so, it is considered that the performance of the zinc oxide lightning arrester is impaired. Among them: Δu1=|u1-u2|, Δu2=|u1-u3|, Δi1=|i1-i2|, Δi2=|i1-i3|, Δθ1=|θ1-θ2|, Δθ2=|θ1-θ3|, Δf is the preset frequency deviation, and f0 is the resonant frequency of the resonant circuit formed by each compensation capacitor and the corresponding coil under normal performance of the zinc oxide lightning arrester.

2. The performance detection method of the zinc oxide lightning arrester integrated with wireless power transmission according to claim 1 is characterized in that: In step S4, it is determined whether the changes Δu1, Δu2, Δi1, Δi2, Δθ1, and Δθ2 exceed the corresponding preset thresholds. When at least three of the six changes exceed the corresponding preset thresholds, it is considered that the performance of the zinc oxide lightning arrester is impaired.

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