技术领域technical field
本发明属于导体表面电场测量技术领域，特别涉及一种GIS设备低压导体表面电场强度测量方法。具体说是研究GIS设备内部典型缺陷局部放电发展与电场强度的关系。The invention belongs to the technical field of conductor surface electric field measurement, in particular to a method for measuring the electric field intensity of a low-voltage conductor surface of GIS equipment. Specifically, it is to study the relationship between the development of partial discharge of typical defects inside GIS equipment and the electric field intensity.
背景技术Background technique
气体绝缘组合电器(GIS，Gas Insulated Switchgear)具有体积小，集成化和安装方便的特点，在电力系统中变电站中得到具有广泛的应用。随着电网电压等级和系统容量的不断增加，GIS设备内部故障也频频发生。因此，该装置对于GIS内部缺陷所引起的局部放电的研究具有重要的意义。局部放电既是造成设备绝缘劣化的先兆和表现形式，又是造成设备绝缘进一步劣化的原因，最终导致设备内部发生击穿或者沿面放电，受到电力企业的密切关注。Gas Insulated Switchgear (GIS, Gas Insulated Switchgear) has the characteristics of small size, integration and convenient installation, and is widely used in substations in power systems. With the continuous increase of grid voltage level and system capacity, internal faults of GIS equipment also occur frequently. Therefore, this device is of great significance for the research of partial discharge caused by internal defects of GIS. Partial discharge is not only the harbinger and manifestation of equipment insulation deterioration, but also the cause of further deterioration of equipment insulation, which eventually leads to breakdown or discharge along the surface of the equipment, which is closely watched by power companies.
随着电网建设的发展，变电站建设中由于场地条件、地质状况和环境条件的限制，使用GIS设备的情况越来越多，而且电网系统内目前在运行的GIS设备越来越多，对GIS设备来说，甚至可以说对大多数SF6,气体绝缘设备而言，其绝缘缺陷是导致设备故障的主要原因。由于GIS设备长期在高电压等级环境下运行以及在各种高压电器操作机构动作下，会导致GIS设备内部缺陷，进而破坏GIS设备绝缘性能。由于SF6,气体绝缘的击穿电压则与电极间的电场强度密切有关，因此对于研究GIS设备内部缺陷和电场强度的关系，具有重要的意义，通过对GIS设备内部缺陷的电场计算和分析并通过试验验证，可以了解GIS电场分布情况，提高GIS内部绝缘强度。With the development of power grid construction, due to the limitations of site conditions, geological conditions and environmental conditions in substation construction, more and more GIS equipment are used, and more and more GIS equipment are currently operating in the power grid system. It can even be said that for most SF6, gas insulated equipment, its insulation defect is the main cause of equipment failure. Due to the long-term operation of GIS equipment in a high-voltage environment and the actions of various high-voltage electrical operating mechanisms, it will cause internal defects in GIS equipment, and then damage the insulation performance of GIS equipment. Since the breakdown voltage of SF6 and gas insulation is closely related to the electric field strength between the electrodes, it is of great significance to study the relationship between the internal defects of GIS equipment and the electric field strength. Through the calculation and analysis of the electric field of the internal defects of GIS equipment and Through the test verification, the electric field distribution of the GIS can be understood and the internal insulation strength of the GIS can be improved.
发明内容Contents of the invention
本发明的目的是提供一种GIS设备低压导体表面电场强度测量装置及方法，其特征在于，测量步骤包括：The object of the present invention is to provide a kind of GIS equipment low-voltage conductor surface electric field intensity measuring device and method, it is characterized in that, measuring step comprises:
(1)建立测量装置：GIS设备外壳通过短支架固定在底座上，高压导体通过底座上长支架支撑在GIS设备外壳中心，在外壳的中间切割0.8m2的楔块，对楔块边缘进行绝缘处理后用绝缘材料支撑在原位；从楔块引出导线连接10千欧的电阻，并电阻接地，电阻两端通过电缆连接放大电路；放大电路与显示器连接；(1) Establish a measuring device: the GIS equipment shell is fixed on the base through a short bracket, the high-voltage conductor is supported in the center of the GIS equipment shell through a long bracket on the base, and a0.8m2 wedge is cut in the middle of the shell to insulate the edge of the wedge After processing, use insulating material to support it in place; lead out the wire from the wedge to connect a 10 kohm resistor, and ground the resistor, and connect the two ends of the resistor to the amplifier circuit through a cable; the amplifier circuit is connected to the display;
(2)检查外壳、电阻的接地情况；(2) Check the grounding condition of the shell and the resistor;
(3)在高压导体上加交流220kV的高压电，(3) Add AC 220kV high-voltage electricity to the high-voltage conductor,
(4)电阻两端的电压信号通过电缆输入到放大电路，在显示器上显示电场强度的读数。(4) The voltage signal at both ends of the resistor is input to the amplifying circuit through the cable, and the reading of the electric field strength is displayed on the display.
本发明的有益效果是通过对GIS设备内部缺陷的电场计算和分析，并通过试验验证，可以了解GIS电场分布情况，对于提高GIS内部绝缘强度和研究GIS设备内部缺陷与电场强度的关系，具有重要的意义。该方法具有简单、成本低、占地面积小、灵活等优点。The beneficial effect of the present invention is that through the calculation and analysis of the electric field of the internal defects of the GIS equipment, and through the test verification, the distribution of the electric field of the GIS can be understood, which is of great importance for improving the internal insulation strength of the GIS and studying the relationship between the internal defects of the GIS equipment and the electric field strength. meaning. The method has the advantages of simplicity, low cost, small footprint, and flexibility.
附图说明Description of drawings
图1为GIS设备低压导体表面电场强度测量装置示意图。Figure 1 is a schematic diagram of the GIS equipment low-voltage conductor surface electric field intensity measurement device.
图2为切割的楔块示意图。Figure 2 is a schematic diagram of the cut wedge.
图3所示为电阻两端电场强度测量值与理论值大小对应的曲线Figure 3 shows the curve corresponding to the measured value of the electric field strength at both ends of the resistor and the theoretical value
具体实施方式detailed description
本发明是提供一种GIS设备低压导体表面电场强度测量装置及方法，下面结合附图对本发明予以说明。The present invention provides a device and method for measuring electric field intensity on the surface of a low-voltage conductor of GIS equipment. The present invention will be described below in conjunction with the accompanying drawings.
图1所示为GIS设备低压导体表面电场强度测量装置示意图，该测量装置为GIS设备外壳2通过短支架9固定在底座10上，高压导体1通过底座10上长支架8支撑在GIS设备外壳2的中心，在外壳2的中间切割0.8m2的楔块3(如图2所示)，对楔块3边缘进行绝缘处理后用绝缘材料11支撑在原位；从楔块3引出导线连接10千欧的电阻4，并电阻4接地，电阻4两端通过电缆5连接放大电路6；放大电路6与显示器7连接。Fig. 1 shows the schematic diagram of the electric field intensity measuring device on the surface of the low-voltage conductor of the GIS equipment. The measuring device is that the GIS equipment shell 2 is fixed on the base 10 through the short bracket 9, and the high-voltage conductor 1 is supported on the GIS equipment shell 2 through the long bracket 8 on the base 10. In the center of the housing 2, cut a wedge 3 of 0.8m2 (as shown in Figure 2), insulate the edge of the wedge 3 and support it in place with an insulating material 11; lead out the wire connection 10 from the wedge 3 The resistance 4 of the thousand ohm is grounded, and the two ends of the resistance 4 are connected to the amplifying circuit 6 through the cable 5; the amplifying circuit 6 is connected to the display 7.
GIS设备低压导体表面电场强度测量原理是：GIS内部高压导体1通入交流220kV的高压电，外壳2接地。在外壳2的中间切割0.8m2的楔块3，并对楔块边缘进行绝缘11处理。从楔块3引出导线，另一端通过10千欧的电阻4接地，将电阻4两端的电压信号通过电缆5输入到放大电路6，在显示器7上显示电场强度的读数。The principle of measuring the electric field intensity on the surface of the low-voltage conductor of the GIS equipment is: the internal high-voltage conductor 1 of the GIS is connected to the high-voltage AC 220kV, and the shell 2 is grounded. Cut a 0.8m2 wedge 3 in the middle of the shell 2, and insulate 11 the edge of the wedge. The wire is drawn out from the wedge 3, and the other end is grounded through a 10 kohm resistor 4, and the voltage signal at both ends of the resistor 4 is input to the amplifying circuit 6 through the cable 5, and the reading of the electric field intensity is displayed on the display 7.
图3所示为电阻两端电场强度测量值与理论值大小对应的曲线。实验装置为单相一体模型，高压导体半径为70mm，长度为1m；接地外壳半径168mm，长度1m；分别给高压导体施加1-10kV的交流电压，测量电阻两端的电场强度大小；其中，表1为电阻两端电场强度测量值与理论值的大小；图3中实线表示为理论值，虚线表示为测量值，二者非常接近；由此看出实施例中的实验装置测量基本准确。因此，本发明能够精确的获取低压导体表面电场强度值。Figure 3 shows the curve corresponding to the measured value of the electric field strength at both ends of the resistor and the theoretical value. The experimental device is a single-phase integrated model, the radius of the high-voltage conductor is 70mm, and the length is 1m; the radius of the grounding shell is 168mm, and the length is 1m; respectively apply an AC voltage of 1-10kV to the high-voltage conductor, and measure the electric field strength at both ends of the resistor; among them, Table 1 It is the magnitude of the measured value and the theoretical value of the electric field intensity at both ends of the resistance; among Fig. 3, the solid line represents the theoretical value, and the dotted line represents the measured value, and the two are very close; thus it can be seen that the measurement of the experimental device in the embodiment is basically accurate. Therefore, the present invention can accurately obtain the value of the electric field intensity on the surface of the low-voltage conductor.
表1电阻两端电场强度测量值与理论值的数值Table 1 The measured value and theoretical value of the electric field strength at both ends of the resistor
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710177530.7ACN106896302A (en) | 2017-03-23 | 2017-03-23 | GIS device low-voltage conductor surface field strength meter and method |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710177530.7ACN106896302A (en) | 2017-03-23 | 2017-03-23 | GIS device low-voltage conductor surface field strength meter and method |
| Publication Number | Publication Date |
|---|---|
| CN106896302Atrue CN106896302A (en) | 2017-06-27 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710177530.7APendingCN106896302A (en) | 2017-03-23 | 2017-03-23 | GIS device low-voltage conductor surface field strength meter and method |
| Country | Link |
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| CN (1) | CN106896302A (en) |
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| RJ01 | Rejection of invention patent application after publication | Application publication date:20170627 | |
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