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129 条记录 (耗时 0.167 秒)

    Transformer protective apparatus having semiconductor and mechanical bypass means
    61.
    发明授权
    Transformer protective apparatus having semiconductor and mechanical bypass means 失效
    具有半导体和机械旁路装置的变压器保护装置

    公开(公告)号：US5815387A

    公开(公告)日：1998-09-29

    申请号：US661474

    申请日：1996-06-11

    申请人： Tomohiko Aritsuka

    发明人： Tomohiko Aritsuka

    IPC分类号： H02H9/02 ,  H02H7/12 ,  H02J3/18 ,  H02M7/48 ,  H02H7/125 ,  H02H7/045

    CPC分类号： H02M1/32 ,  H02J3/1814 ,  Y02E40/18

    摘要： A power converter protective apparatus for protecting an AC-DC converter against an excess fault current by preventing the fault current of a power system from flowing into the AC-DC converter. The protective apparatus comprises a series transformer, whose primary winding is connected in series with a power system and whose secondary winding is connected to a voltage-type AC-DC converter, first current bypass means of a normally open-type connected in parallel with the primary winding, a current transformer for detecting a fault current in the power system, and a control unit for outputting a bypass control signal to the first current bypass means when the current transformer detects the fault current, whereby when the fault in the power system is detected, a fault current flowing through the primary winding is bypassed by the first current bypass means.

    摘要翻译： 一种用于通过防止电力系统的故障电流流入AC-DC转换器来保护AC-DC转换器免受过量故障电流的电力转换器保护装置。 保护装置包括串联变压器，其初级绕组与电力系统串联连接，其次级绕组连接到电压型AC-DC转换器，与常开型并联的第一电流旁路装置 初级绕组，用于检测电力系统中的故障电流的电流互感器，以及当电流互感器检测到故障电流时，向第一电流旁路装置输出旁路控制信号的控制单元，由此当电力系统中的故障为 检测到，流过初级绕组的故障电流被第一电流旁路装置旁路。

    Transformer differential relay
    62.
    发明授权
    Transformer differential relay 失效
    变压器差动继电器

    公开(公告)号：US5627712A

    公开(公告)日：1997-05-06

    申请号：US511248

    申请日：1990-04-19

    申请人： Stanley B. Wilkinson

    发明人： Stanley B. Wilkinson

    IPC分类号： G06F11/14 ,  H02H7/045 ,  H02H3/00

    CPC分类号： G06F11/1435 ,  H02H7/0455

    摘要： The reliability of transformer differential relays is enhanced by providing a method and apparatus which enable improved discrimination between transformer current differentials due to transformer inrush current and current differentials due the occurrence of an internal fault. This improvement in discrimination is provided by generating a first signal representative of currents flowing in at least two windings of the transformer, a second signal representative of a positive portion of the first signal, and a third signal representative of a negative portions of the first signal. A first output signal is generated when the magnitude of the second signal exceeds a first predetermined value, and a second output signal is generated when the magnitude of the third signal exceeds a second predetermined value. A trip signal is generated upon coincidence of the first and second output signals. Additional operate energy is generated when the magnitude of the absolute value of a vector sum operate signal, representative of the vector sum of currents flowing in at least two windings of the transformer, exceeds a first predetermined magnitude. The additional operate energy is terminated and additional restraint energy is generated when the magnitude of a percentage restraint signal, representative of the absolute values of currents flowing in a least two windings of the transformer, exceeds a second predetermined magnitude for a predetermined period of time.

    摘要翻译： 变压器差动继电器的可靠性通过提供一种能够改善由于变压器浪涌电流引起的变压器电流差异和由于内部故障的发生引起的电流差异的鉴别的方法和装置得到增强。 通过产生表示在变压器的至少两个绕组中流动的电流的第一信号，表示第一信号的正部分的第二信号和表示第一信号的负部分的第三信号来提供鉴别的这种改进 。 当第二信号的幅度超过第一预定值时产生第一输出信号，并且当第三信号的幅度超过第二预定值时产生第二输出信号。 在第一和第二输出信号一致时产生跳闸信号。 当代表在变压器的至少两个绕组中流动的电流的矢量和的矢量和的运算信号的幅度的大小超过第一预定量值时，产生额外的操作能量。 当表示在变压器的至少两个绕组中流动的电流的绝对值的百分比约束信号的大小超过预定时间段的第二预定量值时，额外的操作能量被终止并且产生额外的约束能量。

    Microprocessor-based digital protective relay for power transformers
    63.
    发明授权
    Microprocessor-based digital protective relay for power transformers 失效
    用于电力变压器的基于微处理器的数字保护继电器

    公开(公告)号：US5172329A

    公开(公告)日：1992-12-15

    申请号：US537810

    申请日：1990-06-14

    申请人： Azizur M. Rahman ,  Ivi Hermanto ,  Yalla, V. V. S. Murty

    发明人： Azizur M. Rahman ,  Ivi Hermanto ,  Yalla, V. V. S. Murty

    IPC分类号： H02H7/045

    CPC分类号： H02H7/0455

    摘要： A stand alone protective apparatus and method is provided for electrical power devices. Power devices can be damaged due to conditions for example of over current, magnetizing in rush-current, over exitation voltage, saturation, ground fault or internal faults. To protect power devices from the noted conditions, electrical current of the power device is sensed and sampled. Digital processing is used for analyzing the digitally coded sample current and based on one of the conditions that can cause damage, a signal is provided for selectively actuating, by tripping an electric/electronic circuit breaker.

    摘要翻译： 为电力设备提供独立的保护装置和方法。 功率器件可能由于过电流，励磁电流，超过启动电压，饱和度，接地故障或内部故障等情况而受损。 为了保护功率器件免受所述条件的影响，电源设备的电流被感测和采样。 数字处理用于分析数字编码的采样电流，并且基于可能导致损坏的条件之一，通过跳闸电气/电子断路器来提供用于选择性地启动的信号。

    Method and system of transformer protection and method and system of detecting a defective winding
    64.
    发明授权
    Method and system of transformer protection and method and system of detecting a defective winding 失效
    变压器保护方法及系统及检测缺陷绕组的方法和系统

    公开(公告)号：US5170308A

    公开(公告)日：1992-12-08

    申请号：US466926

    申请日：1990-01-18

    申请人： Keizo Inagaki ,  Yoshihiro Sano ,  Yoshiaki Matsui ,  Takafumi Maeda

    发明人： Keizo Inagaki ,  Yoshihiro Sano ,  Yoshiaki Matsui ,  Takafumi Maeda

    IPC分类号： H02H7/04 ,  H02H7/045

    CPC分类号： H02H7/045

    摘要： A method and system of transformer protection in which parallel admittance currents indicative of the apparent excitation state of a transformer to be protected are evaluated from the transformer terminal voltages and currents sampled at a proper interval, and discrimination between an internal defect and excitation inrush is made in response to a magnitude of the parallel admittance current, and a breaker opening command is issued in response to a judgement of internal defect. The method and system enables high-accuracy and high-sensitivity fault detection through a simple computation.

    摘要翻译： 根据变压器端子电压和适当间隔采样的电流来评估指示待保护的变压器的表观激发状态的并联导纳电流的变压器保护的方法和系统，并且进行内部缺陷和激励涌入之间的区分 响应于平行导纳电流的大小，并且响应于内部缺陷的判断而发出断路器打开命令。 该方法和系统通过简单的计算实现了高精度和高灵敏度的故障检测。

    Transformer differential relay
    65.
    发明授权
    Transformer differential relay 失效
    变压器差动继电器

    公开(公告)号：US5014153A

    公开(公告)日：1991-05-07

    申请号：US305479

    申请日：1989-02-01

    申请人： Timothy M. Wilkerson

    发明人： Timothy M. Wilkerson

    IPC分类号： H02H7/045

    CPC分类号： H02H7/045

    摘要： An apparatus for monitoring phased currents in a first winding and a second winding of a transformer and for disconnecting the transformer from a power source supplying the transformer when a difference between the magnitude of the current in the first winding and the magnitude of the current in the second winding exceeds a predetermined amount to indicate a fault condition is disclosed. The apparatus is used in combination with circuitry for generating first and second current signals each having a phase and magnitude which is a function of the phase and magnitude of the phased currents in the first and second windings, respectively. The apparatus includes a circuit for shifting the phase of the second current signal to match the phase of the first current signal, a circuit for detecting a difference between the magnitude of the first current signal and the magnitude of the phase shifted second current signal, and a circuit for disconnecting the transformer from the power source when the detected difference exceeds the predetermiend amount.

    摘要翻译： 一种用于监测变压器的第一绕组和第二绕组中的相位电流的装置，并且用于在第一绕组中的电流的大小与第一绕组中的电流的大小之间的差异时将变压器与供电变压器的电源断开连接 第二绕组超过预定量以表示故障状况。 该装置与用于产生第一和第二电流信号的电路组合使用，每个电流信号分别具有作为第一和第二绕组中的相控电流的相位和幅度的函数的相位和幅度。 该装置包括用于移位第二电流信号的相位以匹配第一电流信号的相位的电路，用于检测第一电流信号的幅度与相移的第二电流信号的幅度之间的差的电路，以及 当检测到的差异超过预定量时，用于断开变压器与电源的电路。

    Solid state transformer differential relay
    66.
    发明授权
    Solid state transformer differential relay 失效
    固态变压器差动继电器

    公开(公告)号：US4204237A

    公开(公告)日：1980-05-20

    申请号：US965141

    申请日：1978-11-30

    申请人： Stanley E. Zocholl

    发明人： Stanley E. Zocholl

    IPC分类号： H02H7/045 ,  H02H3/28 ,  H02H7/04

    CPC分类号： H02H7/045

    摘要： A transformer differential relay monitors the current flowing through the primary and secondary windings of a power transformer and disconnects the transformer from a power source feeding the transformer whenever the magnitudes of these currents indicate a fault condition in the transformer. First and second current transformer generate primary and secondary winding voltage signals representative of the magnitude of the current flowing through the power transformer primary and secondary windings, respectively. A solid state restraint signal generator is responsive to the primary and secondary winding voltage signals and generates a restraint signal representative of the magnitude of the larger of the primary and secondary winding currents, respectively, at each measurement instant. An operate signal generator is responsive to the primary and secondary winding voltage signals and generates an operate signal representative of the magnitude of the vector sum of the currents flowing through the power transformer primary and secondary windings. Finally, means are provided for disconnecting the power transformer from the power source when the magnitude of the operate signal operates above a predetermined percentage of the restraint signal.

    摘要翻译： 变压器差动继电器监测流过电力变压器的初级和次级绕组的电流，并且每当这些电流的大小表示变压器的故障状态时，变压器与供电变压器的电源断开连接。 第一和第二电流互感器分别产生代表流经电力变压器初级和次级绕组的电流大小的初级和次级绕组电压信号。 固态约束信号发生器响应于初级和次级绕组电压信号，并且在每个测量时刻分别产生代表一次和二次绕组电流较大者的幅度的约束信号。 操作信号发生器响应于初级和次级绕组电压信号，并且产生表示流过电力变压器初级和次级绕组的电流的矢量和的大小的操作信号。 最后，提供了当操作信号的大小高于约束信号的预定百分比时断开电源变压器与电源的装置。