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1. 发明授权

US4513246A Clamp-on ammeter 失效
标题翻译：夹紧电流表
公开(公告)号：US4513246A
公开(公告)日：1985-04-23
申请号：US422223
申请日：1982-09-23
申请人： Aurele Blain
发明人： Aurele Blain
IPC分类号： G01R1/22 , G01R19/00
CPC分类号： G01R1/22
摘要： A clamp-on ammeter for measuring current flows in a conductor is described. The ammeter is of a type comprising a magnetic core which can be located about a conductor and an indicator which responds to the magnetic flux consequently generated in the magnetic core to produce a signal indicative of the magnitude of the conductor current. Means are provided for restoring the magnetic core to a predetermined magnetic state for each measurement. The resetting means include a coil wound about the core and a coil energizing circuit which can be activated to produce in the core a residual magnetic flux substantially identical to that produced in the core when unmagnetized by a DC conductor current of predetermined magnitude, which represents the maximum value of any DC current which can be measured by the ammeter. The ammeter includes another coil and energizing circuitry which then produce in the core an offsetting magnetic flux equal in magnitude but opposite in direction to the residual magnetic flux, thereby eliminating any offset which would otherwise be generated by the indicator in response to the residual magnetic flux. To adapt the ammeter for AC measurements, another coil is wound on the core and is electrically shorted when the magnetic flux cutting the windings of the coil changes direction from that of the residual magnetic flux. The shorting of the coil tends to reduce the magnitude of the magnetic flux in the core to substantially zero. By emplying an indicator responsive to a time average magnitude of the core magnetic flux a signal indicative of the magnitude of an alternating current carried by a conductor is produced.
摘要翻译：描述了用于测量导体中的电流流动的夹紧电流表。电流表是一种类型，其包括可以围绕导体定位的磁芯和响应于在磁芯中产生的磁通量的指示器，以产生指示导体电流的大小的信号。提供了用于每次测量将磁芯恢复到预定磁状态的装置。复位装置包括缠绕在芯上的线圈和一个线圈通电电路，该线圈激励电路可以被激活以在芯中产生与通过预定大小的直流导体电流进行非磁化时基本相同的剩余磁通量，可通过电流表测量的任何直流电流的最大值。电流表包括另一个线圈和激励电路，然后在磁芯中产生一个量值相等但与残余磁通相反方向的偏置磁通量，从而消除了响应于剩余磁通量而由指示器产生的任何偏移。为了使电流表适应于交流测量，当切断线圈绕组的磁通量从残余磁通量的方向改变方向时，另一线圈缠绕在芯上并被电短路。线圈的短路倾向于将芯中的磁通量的大小减小至基本为零。通过应用响应于核心磁通量的时间平均幅度的指示器，产生指示由导体携带的交流电流的大小的信号。

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