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    Method for initializing short time and groundfault protection heat index accumulators in a trip unit
    1.
    发明授权
    Method for initializing short time and groundfault protection heat index accumulators in a trip unit 失效
    在跳闸单元中初始化短时间和地面保护热指数蓄能器的方法

    公开(公告)号：US6097192A

    公开(公告)日：2000-08-01

    申请号：US35191

    申请日：1998-03-05

    申请人： Mark J. Obermeier ,  Paul H. Singer ,  Michael R. Koller

    发明人： Mark J. Obermeier ,  Paul H. Singer ,  Michael R. Koller

    IPC分类号： H02H3/02 ,  G01R19/25 ,  H02H3/093 ,  H02H6/00 ,  G01R31/32

    CPC分类号： H02H3/0935 ,  G01R19/2513 ,  H02H6/005

    摘要： A method of initializing short time and groundfault protection heat index accumulators to compensate for current flow during the time interval between the application of phase current and application of current measurement and protection algorithms in an electronic trip unit is presented. The electronic trip unit includes a microcontroller and associated ROM having trip unit application code, e.g., main functionality firmware, including initializing parameters, and boot code, stored therein and EEPROM having operational parameter code, e.g., encoded enumerations for parameters such as 50/60 Hz., UL/ANSI/IEC, etc., stored therein. The time internal comprises first and second time components. The first time component is the time between the instant phase currents are applied and the instant the microcontroller is initialized and the second time component is the time between the instant the microcontroller is initialized and the instant the microcontroller begins execution of short time and groundfault algorithms (i.e., protection algorithms). The first time component is approximated by applying an initial current measurement to index a calibrator. The second time component is measured by a counter controlled by the initialization firmware. The first and second time components are applied to the initial current measurement (or a derivative thereof) to determine an initial value (or a component thereof), for short time and/or groundfault heat index accumulators.

    摘要翻译： 提出了一种在电子跳闸单元中应用相电流和应用电流测量和保护算法之间的时间间隔期间初始化短时间和地漏保护热指数累加器来补偿电流的方法。 电子跳闸单元包括微控制器和相关联的ROM，其具有跳闸单元应用代码，例如，主要功能固件，包括初始化参数和存储在其中的引导代码，以及具有操作参数代码的EEPROM，例如用于50/60等参数的编码枚举 Hz，UL / ANSI / IEC等。 时间内部包括第一和第二时间分量。 第一时间分量是施加瞬时相电流和微控制器初始化的时间之间的时间，第二时间分量是微控制器初始化之后的时间和微控制器开始执行短时间和地面缺陷算法的时间（ 即保护算法）。 通过应用初始电流测量来对校准器进行索引来近似第一次分量。 第二时间分量由初始化固件控制的计数器测量。 将第一和第二时间分量应用于初始电流测量（或其导数）以确定短时间和/或地面缺陷热指数累加器的初始值（或其分量）。