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23 条记录 (耗时 0.013 秒)

    Gas insulated electric apparatus
    3.
    发明公开
    Gas insulated electric apparatus 失效
    气体绝缘电器

    公开(公告)号：EP0476502A3

    公开(公告)日：1992-12-30

    申请号：EP91115373.2

    申请日：1991-09-11

    申请人： HITACHI, LTD.

    发明人： Endo, Fumihiro ,  Utsumi, Tomoaki ,  Ishikawa, Toshio ,  Iwaasa, Shuzo ,  Yamagiwa, Tokio

    IPC分类号： H02B13/065

    CPC分类号： H02B13/065 ,  H02B13/0655

    摘要： In a gas insulated electric apparatus having a plurality of gas sections (3a - 3d) filled with insulating gas, locating device (17) orientates position of a gas section, in which insulation abnormalities are produced, on the basis of a detection signal from sensors (13a, 13b) disposed in each of predetermined gas sections and at the same time hindering degree diagnosing device (18) diagnoses the degree and the kind of the insulation abnormalities, while comparing a detection signal from the sensors with data stored in a data base (19). A valve control (20) generates a valve control signal, responding to the locating device and the hindering degree diagnosing device and trip circuit (2) generates a valve opening signal for opening an electromagnetic valve (9) disposed in a gas section, in which insulation abnormalities are produced, responding to this valve control signal. Insulating gas injecting and evacuating device injects an insulating gas different from the insulating gas, with which the gas sections are filled beforehand, in the gas section, for which the electromagnetic valve opened by the valve opening signal is disposed, or evacuates a predetermined amount of the insulating gas, with which the gas sections are filled beforehand, so as to increase insulation strength.

    Method and apparatus for locating an abnormality in a gas-insulated electric device
    10.
    发明公开
    Method and apparatus for locating an abnormality in a gas-insulated electric device 失效
    Verfahren und Apparatur zur Lokalisierung von einerAbnormalitätin einem gasilolierten elektrischen Apparat。

    公开(公告)号：EP0402906A2

    公开(公告)日：1990-12-19

    申请号：EP90111212.8

    申请日：1990-06-13

    申请人： HITACHI, LTD.

    发明人： Ishikawa, Toshio ,  Iwaasa, Shuzou ,  Utsumi, Tomoaki ,  Endo, Fumihiro

    IPC分类号： G01R31/12 ,  H02B13/065

    CPC分类号： G01R31/1254

    摘要： Disclosed is a method and apparatus for locating an abnormality in a gas-insulated electric device, operative to locate the spot of an insulation abnormality, which emerges inside a metallic container (3), from outside of said metallic container. A plurality of detectors (S₀-S n ) disposed at certain positions in the metallic container produce detected signals, from which spectrum strengths (YH) in a high frequency band of 500 MHz or above are evaluated, and a position which renders a maximum spectrum strength is calculated from the relation between the spectrum strengths and the installation positions of the detectors and is determined to be the spot (x) of partial discharge. The apparatus comprises a plurality of detectors (S₀-S n ) disposed at certain positions in the metallic container, means (21) for analyzing the frequency spectrum of detected signals provided by the detectors thereby to evaluate the spectrum strength, and means (22) for calculating a position, which renders the maximum spectrum strength, from the installation positions of detectors and the spectrum strengths and determining the position to be the spot of partial discharge. The detectors detect the propaga­tion of an electromagnetic wave caused by the partial discharge, and the spectrum strengths are evaluated from the detected signals. Since the electromagnetic wave is attenuated under the influence of the wall resistance, etc. of the metallic container, different spectrum strengths result from detector signals depend­ing on the distance from the spot of partial discharge to each detector. Accordingly, a position which renders the maximum spectrum strength can readily be calculated from the relation between the magnitudes of spectrum strength of detectors and the installation positions of detectors, and the spot (x) of partial discharge can easily and promptly be located.

    摘要翻译： 公开了一种用于定位气体绝缘电气装置中的异常的方法和装置，用于将金属容器（3）内部出现的绝缘异常点从所述金属容器的外部定位。 设置在金属容器的特定位置的多个检测器（S0-Sn）产生检测信号，从而评价500MHz以上的高频带的频谱强度（YH），并且获得最大频谱强度 由频谱强度与检测器的安装位置之间的关系计算，并被确定为局部放电的点（x）。 该设备包括设置在金属容器中的某些位置的多个检测器（S0-Sn），用于分析由检测器提供的检测信号的频谱的装置（21），从而评估频谱强度，以及用于 从检测器的安装位置和频谱强度计算出最大频谱强度的位置，并将位置确定为局部放电点。 检测器检测由局部放电引起的电磁波的传播，并根据检测到的信号评估频谱强度。 由于电磁波在金属容器的壁电阻等的影响下衰减，所以根据从局部放电点到每个检测器的距离的检测器信号产生不同的光谱强度。 因此，可以容易地根据检测器的频谱强度的大小和检测器的安装位置与局部放电的点（x）之间的关系来容易地计算出最大频谱强度的位置。