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公开(公告)号:US5045778A
公开(公告)日:1991-09-03
申请号:US303761
申请日:1989-01-30
摘要: An inrush restraint in a fault indicator disables trip in response to the current in the cable being monitored changing from reset to trip values within a predetermined period.
摘要翻译: 故障指示器中的浪涌抑制响应于正在监视的电缆中的电流在预定时段内从复位变为跳闸值而禁用跳闸。
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公开(公告)号:US5003426A
公开(公告)日:1991-03-26
申请号:US374216
申请日:1989-06-30
申请人: Thomas Yeh , Joseph R. Thibodeau
发明人: Thomas Yeh , Joseph R. Thibodeau
摘要: A faulted circuit indicator includes an inrush restraint circuit that suppresses a trip signal when an inrush current rises from below a minimum value to a trip value within a predetermined time and then drops again to another value such as the trip value. According to various aspects the restraint ends after a fixed time or after a variable time. According to another aspect a second trip circuit overrides the inrush restraint circuit when the current rises a given amount beyond the first trip value.
摘要翻译: 故障电路指示器包括浪涌抑制电路,其在浪涌电流在预定时间内从低于最小值上升到跳闸值时抑制跳闸信号,然后再次下降至诸如跳闸值的另一值。 根据各方面,限制在固定时间之后或在可变时间之后结束。 根据另一方面,当电流上升超过第一跳闸值的给定量时,第二跳闸电路覆盖浪涌抑制电路。
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公开(公告)号:US4980790A
公开(公告)日:1990-12-25
申请号:US297959
申请日:1989-01-17
申请人: Joseph R. Thibodeau
发明人: Joseph R. Thibodeau
IPC分类号: H02H3/04
CPC分类号: H02H3/04
摘要: The reset circuit of a fault indicator is coupled to a transformer secondary winding by a cable having an elongated conductor and a resistance close to the secondary winding. The resistance is capable of withstanding a minimum transient impulse of 10 kv.
摘要翻译: 故障指示器的复位电路通过具有细长导体和靠近次级绕组的电阻的电缆耦合到变压器次级绕组。 电阻能够承受10 kv的最小瞬态脉冲。
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公开(公告)号:US3995202A
公开(公告)日:1976-11-30
申请号:US527187
申请日:1974-11-26
CPC分类号: H03K17/941
摘要: In the device disclosed, a load is energized from energy-carrying lines. A detector responsive to a cyclically recurring physical condition, such as daylight, places a switch either in an operating mode or an idling mode in response to the absence of the condition. A control shifts from an idling mode to an operating mode in response to the detector being in a given one of its modes and shifts back to the idling mode after a given time less than the period of the cyclically recurring physical condition. A circuit responds to the control being shifted to its operating mode in response to the given one of the modes of the detector and responds to the detector simultaneously being in the operating mode so as to connect the lines to the load.
摘要翻译: 在所公开的装置中,负载从能量输送线路通电。 响应于周期性重复的物理条件(例如日光)的检测器响应于不存在条件而将开关置于操作模式或空转模式。 响应于检测器处于给定的一种模式,控制从空转模式转换到操作模式,并且在经过周期性循环的物理条件的时间段之后的一个给定时间内返回到空转模式。 电路响应于控制器响应于给定的一个检测器的模式而响应于其操作模式,并且响应于同时处于操作模式的检测器,以将线路连接到负载。
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