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    • 1. 发明授权
    • Apparatus for detecting degradation of an arrester
    • 用于检测避雷器退化的装置
    • US4791375A
    • 1988-12-13
    • US900417
    • 1986-08-26
    • Masahiro Kan
    • Masahiro Kan
    • H01T15/00G01R27/18G01R31/00G01R31/02G01R31/12H02H7/24
    • G01R31/1236G01R27/18H02H7/24
    • An apparatus for detecting degradation of a grounded arrester, including a wave conversion circuit for producing an output signal corresponding to the total leakage current flowing through the arrester, and a phase shifter circuit coupled to the output signal for providing a capacitive-component leakage current signal, which is cancelled from the total leakage current signal by means of a differential amplifier to produce a resistive-component leakage current signal. According to one embodiment, this latter signal is applied to a synchronous rectifier circuit for synchronous rectification of the output signal from the differential amplifier circuit. A real resistive-component leakage current signal is then detected by adjusting the phase shift amount in the phase shifter circuit so that the output signal from the synchronous rectifier circuit may become zero, thereby bringing the phase of the cancelling wave signal in agreement with the phase of the capacitive-component leakage current signal. In another embodiment, the resistive-component current leakage signal is applied to a multiplier and a time averaging circuit, the output of which is likewise nulled by means of the adjustable phase shifter.
    • 一种用于检测接地避雷器的劣化的装置,包括用于产生对应于流过避雷器的总漏电流的输出信号的波变换电路,以及耦合到输出信号的移相器电路,用于提供电容分量泄漏电流信号 ,其通过差分放大器从总泄漏电流信号中消除以产生电阻分量泄漏电流信号。 根据一个实施例,后一个信号被施加到用于来自差分放大器电路的输出信号的同步整流的同步整流电路。 然后通过调整移相器电路中的相移量来检测真实的电阻分量泄漏电流信号,使得来自同步整流电路的输出信号可能变为零,从而使消除波信号的相位与相位一致 的电容分量泄漏电流信号。 在另一个实施例中,电阻分量电流泄漏信号被施加到乘法器和时间均衡电路,其输出也通过可调移相器同样为零。
    • 7. 发明授权
    • Tank-shape arrester
    • 罐形避雷器
    • US5539607A
    • 1996-07-23
    • US262330
    • 1994-06-17
    • Katsuaki KomatsuYoshihide KayanoMasahiro Kan
    • Katsuaki KomatsuYoshihide KayanoMasahiro Kan
    • H01C1/026H01C1/06H01C7/12H01T1/00H01T4/20H02H3/00
    • H01T4/20H01C7/123
    • An arrester in the shape of a tank has a cylindrical grounding tank as an outer casing to be arranged vertically in which an insulating medium is enclosed. In the grounding tank, a non-linear element group is disposed, the non-linear element group is formed by vertically stacking a plurality of non-linear resisting elements in series at a substantially axially central portion of the grounding tank. A shield having an umbrella-like shape is disposed on a high potential side of the non-linear element group. A shielding unit is operatively connected to a low potential side of the umbrella-shaped shield through a support member. The shielding unit comprises at least one shielding member having a spherical shape provided with a spherical surface portion facing an inner side wall of the grounding tank. When two shielding members are disposed, they are positioned axially symmetrically with respect to the non-linear element group, which comprises a single column or a plurality of symmetrically arranged columns of non-linear resisting element stacks standing upwards along the central axis of the grounding tank.
    • 一种储罐形式的避雷器具有圆柱形接地箱作为垂直安置的绝缘介质封闭的外壳。 在接地箱中设置有非线性元件组,通过在接地箱的大致轴向的中央部串联堆叠多个非线性电阻元件而形成非线性元件组。 具有伞形形状的护罩设置在非线性元件组的高电位侧。 屏蔽单元通过支撑构件可操作地连接到伞形屏蔽的低电位侧。 屏蔽单元包括至少一个具有球形形状的屏蔽构件,该屏蔽构件具有面向接地箱的内侧壁的球面部分。 当设置两个屏蔽构件时,它们相对于非线性元件组轴向对称地定位,该非线性元件组包括沿着接地的中心轴线向上竖立的单列或多对称排列的非线性电阻元件堆叠 坦克。