CN110444918A - Reduce the method and device of transmission line of electricity grounding body impulse earthed resistance - Google Patents
Reduce the method and device of transmission line of electricity grounding body impulse earthed resistance Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- H—ELECTRICITY
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- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
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Abstract
本发明公开了减小输电线路接地体冲击接地电阻的方法，包括在接地体周围设置水平电极；增加水平电极附近电场的不均匀度，增强火花效应；设置水平回流电极，水平回流电极与水平电极连接，降低接地体总体电感。本发明还公开了一种减小输电线路接地体冲击接地电阻的接地装置，包括接地体、水平电极、水平回流电极、针状导体，水平电极的始端与接地体连接，水平回流电极经导体块与水平电极的末端连接，针状导体布置在水平回流电极周围。通过同时增强火花效应和减弱电感影响两种方式减小冲击接地电阻，提高输电线路耐雷水平，保证输电线路安全稳定运行；针状导体与水平回流电极无直接连接，在不增加接地装置电感的前提下使接地装置附近的电场强度畸变，增强火花效应。
The invention discloses a method for reducing the impact grounding resistance of the grounding body of the transmission line, which includes setting horizontal electrodes around the grounding body; increasing the unevenness of the electric field near the horizontal electrodes to enhance the spark effect; setting the horizontal return electrode, the horizontal return electrode and the horizontal electrode connection to reduce the overall inductance of the grounding body. The invention also discloses a grounding device for reducing the impact grounding resistance of the grounding body of the transmission line, which includes a grounding body, a horizontal electrode, a horizontal return electrode, and a needle-shaped conductor. Connected to the end of the horizontal electrode, the needle conductor is arranged around the horizontal return electrode. Reduce the impact grounding resistance by simultaneously enhancing the spark effect and weakening the influence of inductance, improve the lightning resistance level of the transmission line, and ensure the safe and stable operation of the transmission line; there is no direct connection between the needle-shaped conductor and the horizontal return electrode, without increasing the inductance of the grounding device. Distort the electric field strength near the grounding device and enhance the spark effect.
Description
技术领域technical field
本发明属于输电线路接地领域，具体涉及减小输电线路接地体冲击接地电阻的方法及装置。The invention belongs to the field of grounding of transmission lines, and in particular relates to a method and a device for reducing the impact grounding resistance of a grounding body of a transmission line.
背景技术Background technique
输电线路接地装置是是输电线路防雷保护措施中的一个重要部分，其线路防雷能否发挥作用主要决定于输电线路接地装置的冲击接地电阻。冲击接地电阻是指接地装置流过雷电冲击电流时所表现出来的电阻值。除了输电线路接地装置本体结构会影响冲击接触电阻之外，火花效应和电感影响这两个因素对冲击接地电阻亦有一定的影响；其中，火花效应会减小冲击接地电阻，电感影响会增大冲击接地电阻。目前，出现一些接地装置结构通过增强火花效应以减小冲击接地电阻，然而少有接地装置通过减弱电感影响以减小冲击接地电阻。公开号为CN204632938U的中国专利“一种用于风电机组的多散流臂接地装置”通过在环形接地体上设置4个水平射线电极，同时在水平射线电极上设置3个出线端头电极，以减小冲击接地电阻，然而这一方法会增加电感影响。公开号为CN106451030A的中国专利“一种降低地网冲击接地电阻的装置及方法”公开了一种降低地网冲击接地电阻的装置，在水平接地导体上设置有至少一个火花刺导体，土壤更容易发生击穿，火花效应十分显著。这一方法通过增大火花效应以减小接地电阻，然而这一方法中通过设置与接地导体相连的火花刺导体，容易引起电感影响增大，一定程度上会降低降阻效果。公开号为CN204696252U的中国专利“一种树枝状接地极”公开了一种树枝状接地极，包括环形接地体，环形接地体上设有四个水平射线电极。这一结构能有效的改善接地体冲击特性，降低冲击接地电阻；但这一方法无法减小电感影响。The transmission line grounding device is an important part of the transmission line lightning protection measures. Whether the line lightning protection can play a role mainly depends on the impact grounding resistance of the transmission line grounding device. Impulse grounding resistance refers to the resistance value shown when the grounding device flows through the lightning impulse current. In addition to the structure of the transmission line grounding device body affecting the impact contact resistance, the spark effect and the inductance influence also have a certain impact on the impact ground resistance; among them, the spark effect will reduce the impact ground resistance, and the inductance effect will increase Shock ground resistance. At present, some grounding device structures appear to reduce the impact grounding resistance by enhancing the spark effect, but few grounding devices reduce the impact grounding resistance by weakening the influence of inductance. The Chinese patent with the publication number CN204632938U "a grounding device for multi-scattered flow arms for wind turbines" sets four horizontal ray electrodes on the annular grounding body and three outlet terminal electrodes on the horizontal ray electrodes, so as to Reduce the impact ground resistance, however, this method will increase the effect of inductance. The Chinese patent "A device and method for reducing the impact grounding resistance of the ground grid" with the publication number CN106451030A discloses a device for reducing the impact grounding resistance of the ground grid. At least one spark bar conductor is arranged on the horizontal grounding conductor, and the soil is easier to Breakdown occurs, and the spark effect is very significant. This method reduces the grounding resistance by increasing the spark effect. However, in this method, by setting the spark bar conductor connected to the grounding conductor, it is easy to cause an increase in the influence of the inductance, which will reduce the resistance reduction effect to a certain extent. The Chinese patent "A Dendritic Grounding Electrode" with publication number CN204696252U discloses a dendritic grounding electrode, which includes a ring-shaped grounding body on which four horizontal ray electrodes are arranged. This structure can effectively improve the impact characteristics of the grounding body and reduce the impact grounding resistance; however, this method cannot reduce the influence of inductance.
发明内容Contents of the invention
本发明的技术问题是现有的减小输电线路冲击接地电阻的接地装置或方法仅通过增强火花效应以减小冲击接地电阻，无法减小接地装置的电感影响，影响了接地装置的降阻效果。The technical problem of the present invention is that the existing grounding device or method for reducing the impact grounding resistance of transmission lines only reduces the impact grounding resistance by enhancing the spark effect, but cannot reduce the inductance effect of the grounding device, which affects the resistance reduction effect of the grounding device .
本发明的目的是解决上述问题，提供减小输电线路接地体冲击接地电阻的方法及装置，通过同时增强火花效应和减弱电感影响两种方式减小冲击接地电阻，提高输电线路耐雷水平，保证输电线路安全稳定运行。The purpose of the present invention is to solve the above problems, provide a method and device for reducing the impact grounding resistance of the grounding body of the transmission line, reduce the impact grounding resistance by simultaneously enhancing the spark effect and weakening the influence of the inductance, improve the lightning resistance level of the transmission line, and ensure power transmission The line runs safely and stably.
本发明的技术方案是减小输电线路接地体冲击接地电阻的方法，包括以下步骤，The technical solution of the present invention is a method for reducing the impact grounding resistance of the grounding body of the transmission line, comprising the following steps,
步骤1：在接地体周围设置水平电极；Step 1: Set horizontal electrodes around the grounding body;
步骤2：增加水平电极附近电场的不均匀度，增强火花效应；Step 2: Increase the inhomogeneity of the electric field near the horizontal electrode to enhance the spark effect;
步骤3：设置水平回流电极，水平回流电极与水平电极连接，降低接地体总体电感。Step 3: Set up the horizontal return electrode, and connect the horizontal return electrode to the horizontal electrode to reduce the overall inductance of the grounding body.
进一步地，步骤1中，水平电极采用水平射线电极。Further, in step 1, the horizontal electrode is a horizontal ray electrode.
进一步地，步骤2中，通过在水平电极附近设置针状导体，使接地体附近的电场强度畸变；Further, in step 2, the electric field strength near the grounding body is distorted by arranging needle-shaped conductors near the horizontal electrodes;
采用减小输电线路接地体冲击接地电阻的方法的接地装置，包括接地体、水平电极、水平回流电极、绝缘层、针状导体，水平电极的始端与接地体连接，水平回流电极布置在水平电极正下方，水平回流电极经导体块与水平电极的末端连接，绝缘层设置在水平电极与水平回流电极之间，针状导体在水平回流电极下方均匀布置。The grounding device adopts the method of reducing the impact grounding resistance of the grounding body of the transmission line, including a grounding body, a horizontal electrode, a horizontal return electrode, an insulating layer, and a needle-shaped conductor. The beginning of the horizontal electrode is connected to the grounding body, and the horizontal return electrode is arranged on the horizontal electrode. Directly below, the horizontal return electrode is connected to the end of the horizontal electrode through the conductor block, the insulating layer is arranged between the horizontal electrode and the horizontal return electrode, and the needle-shaped conductors are evenly arranged under the horizontal return electrode.
进一步地，水平电极和水平回流电极之间的间距为2-5mm。Further, the distance between the horizontal electrode and the horizontal return electrode is 2-5 mm.
进一步地，绝缘层的厚度是水平电极的宽度的3-5倍，绝缘层的厚度较水平电极和水平回流电极之间的间距小0.5-1 mm。Further, the thickness of the insulating layer is 3-5 times the width of the horizontal electrode, and the thickness of the insulating layer is 0.5-1 mm smaller than the distance between the horizontal electrode and the horizontal return electrode.
进一步地，针状导体与水平回流电极之间的距离为1-3mm。Further, the distance between the needle-shaped conductor and the horizontal return electrode is 1-3mm.
进一步地，针状导体的直径为0.2-0.5mm。Further, the diameter of the needle-shaped conductor is 0.2-0.5 mm.
进一步地，绝缘层、水平电极和水平回流电极三者长度相等。Further, the lengths of the insulating layer, the horizontal electrode and the horizontal return electrode are equal.
相比现有技术，本发明的有益效果通过同时增强火花效应和减弱电感影响两种方式减小冲击接地电阻，提高输电线路耐雷水平，保证输电线路安全稳定运行；同时，增大火花效应的针状导体与水平回流电极无直接连接，能在不增加接地装置电感的前提下使接地装置附近的电场强度畸变，增强火花效应。Compared with the prior art, the beneficial effect of the present invention is to reduce the impact grounding resistance by simultaneously enhancing the spark effect and weakening the influence of the inductance, improve the lightning resistance level of the transmission line, and ensure the safe and stable operation of the transmission line; at the same time, the needle of the spark effect is increased. The shaped conductor is not directly connected to the horizontal return electrode, which can distort the electric field strength near the grounding device and enhance the spark effect without increasing the inductance of the grounding device.
附图说明Description of drawings
下面结合附图和实施例对本发明作进一步说明。The present invention will be further described below in conjunction with drawings and embodiments.
图1为减小输电线路接地体冲击接地电阻的方法的流程图。Fig. 1 is a flowchart of a method for reducing the impact grounding resistance of a grounding body of a transmission line.
图2为减小输电线路接地体冲击接地电阻的接地装置的结构示意图。Fig. 2 is a structural schematic diagram of a grounding device for reducing the impact grounding resistance of a grounding body of a transmission line.
附图标记说明：接地体1，水平射线电极2，水平回流电极3，导体块4，绝缘层5，针状导体6。Explanation of reference numerals: grounding body 1 , horizontal ray electrode 2 , horizontal return electrode 3 , conductor block 4 , insulating layer 5 , needle-shaped conductor 6 .
具体实施方式Detailed ways
如图1所示，减小输电线路接地体冲击接地电阻的方法，包括以下步骤，As shown in Figure 1, the method for reducing the impact grounding resistance of the grounding body of the transmission line includes the following steps,
步骤1：在接地体周围设置水平电极；Step 1: Set horizontal electrodes around the grounding body;
步骤2：增加水平电极附近电场的不均匀度，增强火花效应；Step 2: Increase the inhomogeneity of the electric field near the horizontal electrode to enhance the spark effect;
步骤3：设置水平回流电极，水平回流电极与水平电极连接，降低接地体总体电感。Step 3: Set up the horizontal return electrode, and connect the horizontal return electrode to the horizontal electrode to reduce the overall inductance of the grounding body.
如图2所示，采用上述减小输电线路接地体冲击接地电阻的方法的接地装置，包括方形的接地体1、水平射线电极2、水平回流电极3、针状导体6，水平回流电极3布置在水平射线电极2正下方，水平回流电极3经导体块4与水平射线电极2的末端连接，针状导体6布置在水平回流电极3周围。4个水平射线电极2分别连接到接地体1的4个角。As shown in Figure 2, the grounding device adopting the above-mentioned method of reducing the impact grounding resistance of the grounding body of the transmission line includes a square grounding body 1, a horizontal ray electrode 2, a horizontal return electrode 3, and a needle-shaped conductor 6, and the arrangement of the horizontal return electrode 3 Directly below the horizontal ray electrode 2 , the horizontal return electrode 3 is connected to the end of the horizontal ray electrode 2 via the conductor block 4 , and the needle-shaped conductor 6 is arranged around the horizontal return electrode 3 . The four horizontal ray electrodes 2 are respectively connected to the four corners of the ground body 1 .
水平射线电极2和水平回流电极3之间的间距为5mm。The distance between the horizontal ray electrode 2 and the horizontal return electrode 3 is 5 mm.
水平射线电极2与水平回流电极3之间设置有绝缘层5。An insulating layer 5 is provided between the horizontal ray electrode 2 and the horizontal return electrode 3 .
绝缘层5设置在水平射线电极2与水平回流电极3之间，绝缘层5的宽度为水平电极的宽度的3倍，绝缘层5的厚度是为4.5mm。The insulating layer 5 is arranged between the horizontal ray electrode 2 and the horizontal return electrode 3 , the width of the insulating layer 5 is three times the width of the horizontal electrode, and the thickness of the insulating layer 5 is 4.5mm.
针状导体6与水平回流电极3之间的距离为3mm。The distance between the needle-shaped conductor 6 and the horizontal return electrode 3 is 3 mm.
针状导体6的直径为0.5mm。The diameter of the needle conductor 6 is 0.5 mm.
绝缘层5、水平射线电极2和水平回流电极3三者长度相等。The insulating layer 5, the horizontal ray electrode 2 and the horizontal return electrode 3 have the same length.
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Application publication date: 20191112 Assignee: Hubei Feiou Commercial Management Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980045280 Denomination of invention: Method and device for reducing impulse grounding resistance of grounding electrodes in transmission lines Granted publication date: 20210126 License type: Common License Record date: 20231102 |
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Effective date of registration: 20240130 Address after: 325000, No. 988 Lingzhan Road, Oujiangkou Industrial Agglomeration Zone, Wenzhou City, Zhejiang Province Patentee after: Chentong Intelligent Electrical Co.,Ltd. Country or region after: China Address before: 443002 No. 8, University Road, Xiling District, Yichang, Hubei Patentee before: CHINA THREE GORGES University Country or region before: China |
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