WO2016033713A1 - 一种非工频工况gis设备局部放电缺陷模拟装置 - Google Patents

一种非工频工况gis设备局部放电缺陷模拟装置 Download PDF

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WO2016033713A1
WO2016033713A1 PCT/CN2014/001173 CN2014001173W WO2016033713A1 WO 2016033713 A1 WO2016033713 A1 WO 2016033713A1 CN 2014001173 W CN2014001173 W CN 2014001173W WO 2016033713 A1 WO2016033713 A1 WO 2016033713A1
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gis
voltage
partial discharge
transformer
frequency
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PCT/CN2014/001173
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English (en)
French (fr)
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朱太云
杨道文
叶剑涛
程登峰
王贻平
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国家电网公司
国网安徽省电力公司电力科学研究院
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Publication of WO2016033713A1 publication Critical patent/WO2016033713A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing

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  • the invention belongs to the technical field of ultrasonic partial discharge detection of gas insulated combined electrical appliances (referred to as GIS), in particular to a device for simulating partial discharge of non-power frequency working conditions of gas insulated combined electrical appliances, which is used for realizing GIS defect model in non-power frequency Simulation of partial discharge characteristics under voltage conditions.
  • GIS gas insulated combined electrical appliances
  • Gas Insulated Switchgear-GIS which uses SF6 as an insulating medium, is also called a closed combination electric appliance.
  • GIS has the advantages of small footprint, compact structure, good electromagnetic compatibility, safe and reliable operation, and its application in power systems is more and more extensive.
  • Carrying out partial discharge detection of GIS equipment is of great significance for timely grasping the internal defects of the equipment, realizing the state evaluation and risk assessment of the equipment, and realizing the state maintenance of the GIS equipment.
  • ultrasonic partial discharge detection technology plays an important role in partial discharge detection of GIS equipment because it can avoid electromagnetic interference on site.
  • the researchers established various gas insulation combined electrical appliance defect simulation devices, and their typical structural composition is shown in Figure 1.
  • the output of the voltage regulator is used to supply the power frequency step-up transformer.
  • the high-voltage output of the power frequency step-up transformer is applied to the defect model connected to the busbar, and the defect model is installed in the GIS structure simulation device.
  • the power frequency step-up transformer can be independently installed outside the GIS equipment structure simulation device, or can be compacted and assembled with the GIS structure simulation device in the casing of the GIS structure simulation device.
  • the test voltage is non-power frequency, which is different from the normal operation voltage frequency.
  • the GIS equipment is in non-power frequency.
  • the characteristics of the discharge signal are not only related to the type of defect, but also related to the voltage frequency on the GIS device.
  • the defect simulation device shown in FIG. 1 in the prior art cannot realize the GIS defect simulation of the non-power frequency condition.
  • the present invention provides a partial discharge defect simulation device for the non-power frequency working condition GIS equipment.
  • the structural feature of the partial discharge defect simulation device of the GIS equipment of the non-power frequency working condition of the invention is: setting a variable frequency power supply module,
  • the power signal input end of the variable frequency power supply module is connected to the three-phase 380V AC power supply provided by the power grid through a cable, and the output voltage of the variable frequency power supply module is provided with an AC voltage with adjustable frequency and amplitude;
  • the step-up transformer is installed in the GIS In the housing of the structural simulation device, the low voltage winding of the step-up transformer is led out of the housing of the GIS structure simulation device through the first insulator and the second insulator, and is connected to the output end of the variable frequency power supply module through a cable.
  • the high voltage output end of the step-up transformer is connected to a bus bar disposed in a casing of the GIS device structure simulation device, one end of the defect model is connected to the bus bar, and the other end is grounded; the defect model is any one Defect model of GIS structure simulation device.
  • the structural characteristic of the partial discharge defect simulation device of the GIS equipment of the non-power frequency working condition of the invention is also that the frequency range of the AC voltage adjustable by the frequency conversion power supply module and the amplitude adjustable is 30 Hz to 300 Hz, and the amplitude is 0 ⁇ 350V; the step-up transformer has an operating frequency range of 30 Hz to 300 Hz.
  • the invention utilizes a variable frequency power supply to supply power to the step-up transformer, and by changing the output voltage frequency of the variable frequency power supply, thereby changing the output voltage frequency of the step-up transformer, and changing the voltage frequency applied to the defect model, thereby realizing the GIS equipment handover acceptance test process
  • the power frequency working condition simulation provides a basis for the laboratory to obtain the partial discharge signal characteristics of the defect model under the condition of GIS equipment under non-power frequency conditions, and provides a basis for the defect type judgment based on the characteristics of the partial discharge signal during the field withstand voltage test. .
  • FIG. 1 is a block diagram showing the structure of a conventional GIS device defect simulation device in the prior art
  • FIG. 2 is a block diagram of the present invention
  • FIG. 3 is a schematic view showing the outline of a GIS structure simulation device
  • FIG. 4 is a schematic diagram showing the internal structure of a GIS structure simulation device
  • FIG. 5 is a schematic diagram of the characteristics of the partial discharge ultrasonic signal used in the 60 Hz voltage condition of the burr defect model according to the present invention.
  • step-up transformer 1 step-up transformer, 2 housings, 3 first insulators, 4 second insulators, 5 bus bars, 6 defect models, 7 front three-way tubular cavities, 8 rear three-way tubular cavities, 9 basins Insulator, 10 end cap, 11 ultrasonic sensor.
  • the structural form of the partial discharge defect simulation device of the non-power frequency working condition GIS device in the embodiment is: setting a variable frequency power supply module, the power signal input end of the variable frequency power supply module and the three-phase 380V AC power supply provided by the power grid Connected by a cable, an AC voltage with adjustable frequency and amplitude is provided at an output end of the variable frequency power supply module;
  • the step-up transformer 1 is installed in a casing 2 of a GIS structure simulation device, and the low voltage winding of the step-up transformer 1 passes First
  • the edge 3 and the second insulator 4 are taken out outside the casing 2 of the GIS structure simulation device, and are connected to the output end of the variable frequency power supply module through a cable, and the high voltage output terminal of the step-up transformer 1 is set in the GIS
  • the bus bars 5 in the casing 2 of the equipment structure simulation device are connected, one end of the defect model 6 is connected to the bus bar 5, and the other end is grounded;
  • the defect model 6 is a defect model of
  • the frequency and the amplitude adjustable AC voltage provided by the variable frequency power supply module have a frequency range of 30 Hz to 300 Hz, and the amplitude is 0 to 350 V; and the operating frequency range of the step-up transformer 1 is 30 Hz to 300 Hz.
  • the defect model is a kind of discharge model artificially manufactured to simulate the internal defects of the actual GIS equipment, and is a prior art in the art.
  • Common defect models include free metal particle defect models, burr defect models, insulator surface contamination defects models, and so on.
  • the invention realizes the partial discharge simulation of the defect of the GIS equipment under the condition of non-power frequency working condition by adjusting the voltage frequency applied to the defect model.
  • FIGS. 3 and FIG. 4 show an embodiment of a GIS structure simulation device to be used in the present invention.
  • the housing 2 of the GIS structure simulation device is composed of a front three-way tubular cavity 7 and The rear three-way tubular cavity 8 is formed by docking.
  • the two three-way tubular cavity is provided with an inflation port and a barometer.
  • the abutting faces of the two three-way tubular cavities are separated by a basin insulator 9 and are flanged. Face seal.
  • the other end faces of the front three-way tubular cavity 7 and the rear three-way tubular cavity 8 are sealed by the end cover 10, and the first insulator 3 and the second insulator 4 are respectively disposed at the side end covers of the front three-way tubular cavity 7.
  • the diameters of the front three-way tubular cavity 7 and the rear three-way tubular cavity 8 are selected according to the actual 110kV GIS busbar diameter.
  • the high voltage output voltage of the step-up transformer is 110kV, and the diameter of the busbar 5 is selected according to the actual diameter of the 110kV GIS busbar.
  • an embodiment of a partial discharge ultrasonic signal characteristic of a burr discharge defect model under the condition of 60 Hz is obtained by the present invention.
  • the ultrasonic sensor 11 is mounted on the outer casing 2 of the GIS structure simulation device, and the output of the ultrasonic sensor is connected to the input end of the ultrasonic PD detector through a signal cable.
  • a coupling agent is applied between the ultrasonic sensor and the outer casing 2, and the defect model 6 is a burr discharge defect model.
  • Experimental process adjust the output voltage frequency of the variable frequency power supply module to 60Hz, and then slowly increase the output voltage of the variable frequency power supply module until the ultrasonic partial discharge detector detects the discharge of the defect model, and then keep the output voltage of the variable frequency power supply module unchanged, through the ultrasonic
  • the partial discharge detector detects the partial discharge ultrasonic signal generated by the defect model 6, and can obtain the ultrasonic partial discharge signal characteristic of the burr discharge defect model under the condition of 60 Hz voltage.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

一种非工频工况GIS设备局部放电缺陷模拟装置，其特征是设置变频电源模块，其电源信号输入端与电网三相380V交流供电电源通过电缆相连，以变频电源模块的输出端提供频率和幅值可调的交流电压；升压变压器安装于GIS结构模拟装置的壳体中，升压变压器的低压绕组通过第一绝缘子和第二绝缘子引出在GIS结构模拟装置的壳体的外部，并通过电缆与变频电源模块的输出端相连接，升压变压器的高压输出端与设置在GIS设备结构模拟装置的壳体中的母线相连接，缺陷模型的一端与母线相连接，另一端接地。本装置用于实现非工频电压条件下GIS设备缺陷模型模拟，获取非工频电压条件下GIS设备缺陷模型局部放电信号特征。

Description

一种非工频工况GIS设备局部放电缺陷模拟装置 技术领域
本发明属于气体绝缘组合电器(简称GIS)超声局部放电检测技术领域，特别是涉及一种用于气体绝缘组合电器非工频工况局部放电模拟的装置，用于实现GIS缺陷模型在非工频电压条件下局部放电特征的模拟。
背景技术
以SF6为绝缘介质的气体绝缘金属封闭开关设备(Gas Insulated Switchgear-GIS)也称封闭式组合电器。与常规电器设备相比，GIS更具有占地面积小、结构紧凑、电磁兼容性好、运行安全可靠等优点，其在电力系统中的应用越来越广泛。开展GIS设备局部放电检测对于及时掌握设备内部缺陷状况，实现设备的状态评价和风险评估，实现GIS设备的状态检修具有重要意义。作为一种常用的局部放电检测方法，超声波局部放电检测技术由于可以避开现场电磁干扰，在GIS设备的局部放电检测中起着重要作用。为了获取各种缺陷模型局部放电超声信号特征，研究人员建立了各种气体绝缘组合电器缺陷模拟装置，其典型结构构成如图1所示。以调压器的输出为工频升压变压器供电，工频升压变压器高压输出施加到连接在母线上的缺陷模型上，缺陷模型则安装在GIS结构模拟装置内。工频升压变压器可以独立在GIS设备结构模拟装置之外，也可以小型化后与GIS结构模拟装置集合在一起置于GIS结构模拟装置的壳体内。
为了提高GIS设备的质量，确保“零”缺陷投运，最新的国家电网公司《十八项电网重大反事故措施(修订版)》中对GIS设备交接验收试验耐压过程中的局部放电检测提出了明确的要求。
在对于GIS设备的现场交接验收试验过程中，由于是采用串联谐振装置来产生试验所需的高电压，因此试验电压是非工频，与正常运行的电压频率不同，此时GIS设备处于非工频电压条件下，由于局部放电信号特征的电压相关性，其放电信号特征不止与缺陷类型有关，也与GIS设备上的电压频率有关。但已有技术中如图1所示的缺陷模拟装置无法实现非工频工况GIS缺陷模拟。
发明内容
为了实现非工频电压条件下GIS设备缺陷模型模拟，获取非工频电压条件下GIS设备缺陷模型局部放电信号特征，本发明提供一种非工频工况GIS设备局部放电缺陷模拟装置。
本发明为解决技术问题采用如下技术方案：
本发明非工频工况GIS设备局部放电缺陷模拟装置的结构特点是：设置变频电源模块， 所述变频电源模块的电源信号输入端与电网提供的三相380V交流供电电源通过电缆相连，以所述变频电源模块的输出端提供频率和幅值可调的交流电压；升压变压器安装于GIS结构模拟装置的壳体中，所述升压变压器的低压绕组通过第一绝缘子和第二绝缘子引出在GIS结构模拟装置的壳体的外部，并通过电缆与所述变频电源模块的输出端相连接，所述升压变压器的高压输出端与设置在GIS设备结构模拟装置的壳体中的母线相连接，缺陷模型的一端与所述母线相连接，另一端接地；所述缺陷模型为任意一种GIS结构模拟装置的缺陷模型。
本发明非工频工况GIS设备局部放电缺陷模拟装置的结构特点也在于：由所述变频电源模块提供的频率和幅值可调的交流电压的频率范围为30Hz～300Hz，幅值为0～350V；所述升压变压器的工作频率范围为30Hz-300Hz。
与已有技术相比，本发明有益技术效果体现在：
本发明利用变频电源为升压变压器供电，通过改变变频电源的输出电压频率，从而改变升压变压器输出电压频率，达到改变施加在缺陷模型上的电压频率，从而实现GIS设备交接验收试验过程中非工频工况模拟，为实验室获取GIS设备非工频工况条件下缺陷模型的局部放电信号特征提供了基础，为现场耐压试验过程中依据局部放电信号特征进行缺陷类型的判断提供了依据。
附图说明
图1为现有技术中常规GIS设备缺陷模拟装置构成方框图；
图2为本发明方框图；
图3为GIS结构模拟装置外形示意图；
图4为GIS结构模拟装置内部结构示意图；
图5为本发明用来获取毛刺缺陷模型60Hz电压条件下局部放电超声信号特征的示意图。
图中标号：1升压变压器，2壳体，3第一绝缘子，4第二绝缘子，5母线，6缺陷模型，7前段三通管状腔体，8后段三通管状腔体，9盆式绝缘子，10端盖，11超声传感器。具体实施方式
参见图2，本实施例中非工频工况GIS设备局部放电缺陷模拟装置的结构形式是：设置变频电源模块，所述变频电源模块的电源信号输入端与电网提供的三相380V交流供电电源通过电缆相连，以所述变频电源模块的输出端提供频率和幅值可调的交流电压；升压变压器1安装于GIS结构模拟装置的壳体2中，所述升压变压器1的低压绕组通过第一绝 缘子3和第二绝缘子4引出在GIS结构模拟装置的壳体2的外部，并通过电缆与所述变频电源模块的输出端相连接，所述升压变压器1的高压输出端与设置在GIS设备结构模拟装置的壳体2中的母线5相连接，缺陷模型6的一端与所述母线5相连接，另一端接地；所述缺陷模型6为任意一种GIS结构模拟装置的缺陷模型。
具体实施中，由变频电源模块提供的频率和幅值可调的交流电压的频率范围为30Hz～300Hz，幅值为0～350V；所述升压变压器1的工作频率范围为30Hz-300Hz。
缺陷模型是为了模拟实际GIS设备内部缺陷而人为制造的一种放电模型，是本领域的一种已有技术。常用缺陷模型有自由金属微粒缺陷模型、毛刺缺陷模型、绝缘子表面污秽缺陷模型等等。本发明通过调整施加在缺陷模型上的电压频率，实现非工频工况条件下GIS设备缺陷局部放电模拟。
图3和图4所示为应在本发明中的GIS结构模拟装置的一种实施方式，如图3和图4所示，GIS结构模拟装置的壳体2由前段三通管状腔体7和后段三通管状腔体8对接组成，两个三通管状腔体上分设置有充气口和气压表，两个三通管状腔体的对接面通过盆式绝缘子9相隔离，并采用法兰面密封。前段三通管状腔体7和后段三通管状腔体8的其它端面通过端盖10进行密封，第一绝缘子3和第二绝缘子4分别设置在前段三通管状腔体7的侧部端盖上。前段三通管状腔体7和后段三通管状腔体8的直径按照实际110kV GIS母线筒直径进行选取，升压变压器高压输出电压最高为110kV，母线5的直径按照实际110kVGIS母线直径选取。
参见图5为采用本发明获取60Hz电压条件下毛刺放电缺陷模型局部放电超声波信号特征的实施方式。超声传感器11安装在GIS结构模拟装置的外壳2上，超声传感器的输出通过信号电缆连接到超声波局放检测仪的输入端。为了保证接触的紧密性，在超声传感器和外壳2之间涂有耦合剂，缺陷模型6为毛刺放电缺陷模型。
实验过程：调节变频电源模块的输出电压频率到60Hz，然后缓慢升高变频电源模块的输出电压，直到超声局放检测仪检测到缺陷模型发生放电，然后保持变频电源模块输出电压不变，通过超声局部放电检测仪对缺陷模型6产生的局部放电超声信号进行检测，即可获取毛刺放电缺陷模型在60Hz电压条件下超声局放信号特征。

Claims (2)

  1. 一种非工频工况GIS设备局部放电缺陷模拟装置，其特征是：设置变频电源模块，所述变频电源模块的电源信号输入端与电网提供的三相380V交流供电电源通过电缆相连，以所述变频电源模块的输出端提供频率和幅值可调的交流电压；升压变压器(1)安装于GIS结构模拟装置的壳体(2)中，所述升压变压器(1)的低压绕组通过第一绝缘子(3)和第二绝缘子(4)引出在GIS结构模拟装置的壳体(2)的外部，并通过电缆与所述变频电源模块的输出端相连接，所述升压变压器(1)的高压输出端与设置在GIS设备结构模拟装置的壳体(2)中的母线(5)相连接，缺陷模型(6)的一端与所述母线(5)相连接，另一端接地；所述缺陷模型(6)为任意一种GIS结构模拟装置的缺陷模型。
  2. 根据权利要求1所述的非工频工况GIS设备局部放电缺陷模拟装置，其特征是：由所述变频电源模块提供的频率和幅值可调的交流电压的频率范围为30Hz～300Hz，幅值为0～350V；所述升压变压器(1)的工作频率范围为30Hz-300Hz。
PCT/CN2014/001173 2014-09-05 2014-12-25 一种非工频工况gis设备局部放电缺陷模拟装置 WO2016033713A1 (zh)

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CN108646158A (zh) * 2018-08-16 2018-10-12 国网山西省电力公司临汾供电公司 用于高压开关柜交流耐压试验的局部放电检测系统
CN109752623A (zh) * 2018-12-07 2019-05-14 国网浙江省电力有限公司金华供电公司 一种用于模拟绝缘子破损缺陷引起架空线路故障的装置
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