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    • 23. 发明授权
    • Surge counter for an overvoltage arrester
    • 用于过电压避雷器的浪涌计数器
    • US4796283A
    • 1989-01-03
    • US27549
    • 1987-03-18
    • Kurt BrunnerRudolf FischerKlaus Giese
    • Kurt BrunnerRudolf FischerKlaus Giese
    • H01T1/12G01R19/17G01R31/00G01W1/16H01T15/00H02H3/04G06M3/00H02H9/04
    • H02H3/048Y10T307/858
    • A device for counting the overvoltage surges discharged by a gapless overvoltage arrester contains a sensing head and a counting mechanism which follows the sensing head. In the sensing head, the discharge current carried by the overvoltage arrester in a ground return line during the occurrence of an overvoltage surge is detected. The counting mechanism records an overvoltage surge as soon as the discharge current exceeds a threshold value. During this process, an effective connection between the sensing head and a counter is established for a brief time by means of a switch. This device is intended to be characterized, with a high counting accuracy, by a dead time which is independent of the components used. This is achieved by the measure that the switch is followed by a threshold detector which responds above the threshold value of the discharge current. This threshold detector acts both on the counter and on a control member, such as a monostable multivibrator, which switches the switch off after the threshold detector has responded and holds it in the switched-off position during a predetermined period which is essentially determined by the duration of the overvoltage surge.
    • 用于对由无间隙过电压避雷器放电的过电压浪涌进行计数的装置包括感测头和跟随感测头的计数机构。 在感测头中,检测出现过电压浪涌期间过电压避雷器在接地回路中承受的放电电流。 一旦放电电流超过阈值,计数机制记录过压浪涌。 在此过程中,传感头和计数器之间的有效连接通过开关建立短暂的时间。 该装置的特征在于具有高的计数精度,其死区时间与所使用的组件无关。 这是通过这样的措施实现的:开关之后是响应于放电电流的阈值之上的阈值检测器。 该阈值检测器在计数器和诸如单稳态多谐振荡器的控制构件上起作用,该阈值检测器在阈值检测器响应之后将其切断,并且在预定时段内将其保持在关闭位置,该预定时间段基本上由 过电压浪涌的持续时间。