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91. 发明授权

US4135222A Fault current protection switch 失效
标题翻译：故障电流保护开关
公开(公告)号：US4135222A
公开(公告)日：1979-01-16
申请号：US760974
申请日：1977-01-21
申请人： Bernd J. Siepmann
发明人： Bernd J. Siepmann
IPC分类号： H02H3/32 , H01H83/02 , H02H3/33 , H02H3/347 , H02H3/28
CPC分类号： H02H3/332
摘要： A fault current protection switch detects fault currents from conductors of a supply means to ground. The system uses at least one difference transformer connected to the conductors of the supply mains. An oscillation generator circuit is connected to the difference transformer through feedback windings. The oscillation generator circuit checks the magnetization of a core of the difference transformer, and, in the event of a change in the transforming properties of the core due to "mis" magnetization caused by a fault current, the oscillation generator circuit triggers a control and switching member connected in the supply mains to disconnect the same.
摘要翻译：故障电流保护开关检测从供电装置的导体到地的故障电流。该系统使用至少一个连接到电源的导线的差分变压器。振荡发生器电路通过反馈绕组连接到差分变压器。振荡发生器电路检查差分变压器的磁芯的磁化，并且在由于故障电流引起的“误”磁化的芯的变换特性的变化的情况下，振荡发生器电路触发控制，开关构件连接在电源中以断开连接。

92. 发明授权

US4080641A Ground fault detector 失效
标题翻译：接地故障检测器
公开(公告)号：US4080641A
公开(公告)日：1978-03-21
申请号：US704323
申请日：1976-07-12
申请人： Otto Heinrich Schade, Jr.
发明人： Otto Heinrich Schade, Jr.
IPC分类号： H02H3/347 , G01R19/145 , G01R31/02 , H02H3/33 , H02H3/28
CPC分类号： G01R31/025 , G01R19/145 , H02H3/337
摘要： A ground fault detector which exhibits greater sensitivity to sensing coil current during the initial portions of a-c line voltage half-cycles than during the final portions of those half cycles. This improves its response to resistive ground faults in the presence of unbalanced capacitance to ground conditions of the a-c power lines.
摘要翻译：一种接地故障检测器，它在a-c线电压半周期的初始部分期间比在半个周期的最后部分期间对感测线圈电流具有更大的灵敏度。在a-c电源线的接地状态不平衡的情况下，这可以改善其对电阻性接地故障的响应。

93. 发明授权

US3978400A Ground fault detector with a nonlinear sensing means 失效
标题翻译：具有非线性感测方式的地面故障检测器
公开(公告)号：US3978400A
公开(公告)日：1976-08-31
申请号：US526568
申请日：1974-11-25
申请人： Dorn L. Pettit
发明人： Dorn L. Pettit
IPC分类号： G01R15/18 , G01R31/08 , H02H3/00 , H02H3/347 , G01R31/02 , H02H3/16
CPC分类号： G01R31/086 , G01R15/185 , H02H3/347 , H02H3/006
摘要： A ground fault detector for an ungrounded electrical distribution system responds to a wide range of ground fault current levels by providing the ground fault sensing circuitry with a high impedance at low ground fault signal levels and a low impedance at higher ground fault signal levels. The varying or nonlinear impedance of the sensing circuitry occurs due to the presence of the series combination of a Zener diode and a resistor connected in parallel with a level sensing means. At ground fault signals below the Zener voltage of the Zener diode, the impedance of the sensing circuitry is that of the level sensing means. When the ground fault signal exceeds the Zener voltage, the impedance of the sensing means is significantly reduced since the Zener resistor is now in effective parallel combination with the impedance of the level sensing means.Varying degrees of filtering of the ground fault signal are accomplished through provision of alternate connection terminals of increasing resistance for a filtering capacitor.A ground fault test circuit for the detector provides the equivalent of one-half ampere ground fault. Higher ground faults may easily be simulated by winding additional turns of a test winding on a differential transformer of the detector; each additional turn simulates an additional one-half ampere ground fault.

94. 发明授权

US3968409A Ground fault detector circuit with high current inhibit 失效
标题翻译：具有高电流抑制功能的接地故障检测电路
公开(公告)号：US3968409A
公开(公告)日：1976-07-06
申请号：US548295
申请日：1975-02-10
申请人： Harold W. Windler
发明人： Harold W. Windler
IPC分类号： H02H3/347 , H02H7/22 , H02H7/085
CPC分类号： H02H3/347 , H02H7/222
摘要： A current transformer couples to the power lines leading to a motor starter and it generates a current proportional to the current which flows as a result of ground faults. When the ground fault current reaches a first level, the circuit is tripped and a circuit breaker deenergizes the motor starter. When the ground fault current reaches a second, much higher, level the circuit is inhibited from operating to allow circuit interrupting devices in the motor starter to interrupt the circuit to the motor.
摘要翻译：电流互感器耦合到通向电动机启动器的电源线，并且其产生与由于接地故障而流动的电流成比例的电流。当接地故障电流达到第一电平时，电路跳闸，断路器对电机起动器通电。当接地故障电流达到第二，高得多的电平时，电路被禁止运行，允许电机起动器中的电路中断装置中断到电机的电路。

95. 发明授权

US3955121A Short-circuit protective systems 失效
标题翻译：短路保护系统
公开(公告)号：US3955121A
公开(公告)日：1976-05-04
申请号：US506518
申请日：1974-09-16
申请人： Thomas J. Vahey
发明人： Thomas J. Vahey
IPC分类号： H02H3/347 , H02H7/08 , H02H3/28
CPC分类号： H02H3/347 , H02H7/08
摘要： My invention relates to short-circuit protective systems for polyphase dynamo electric machine, which systems are very sensitive and respond to ground short-circuits as well as to phase-to-phase short circuits. The invention comprises two or three small current transformers connected to a single instantaneous relay which is applied to trip the machine contactor or breaker when any ground short-circuit or phase-to-phase short-circuit occurs.
摘要翻译：本发明涉及多相发电机的短路保护系统，其系统非常灵敏，对接地短路以及相间短路有反应。本发明包括两个或三个小型电流互感器，其连接到单个瞬时继电器，当任何接地短路或相间短路发生时，其应用于使机器接触器或断路器跳闸。

96. 发明授权

US3809962A Ground current powered ground fault protector 失效
标题翻译：接地电源接地故障保护器
公开(公告)号：US3809962A
公开(公告)日：1974-05-07
申请号：US35106873
申请日：1973-04-13
申请人： SQUARE D CO
发明人： BROWN W , STANBACK H
IPC分类号： H02H3/027 , H02H3/347 , H02H3/26
CPC分类号： H02H3/027 , H02H3/347
摘要： An equipment protection system uses a differential transformer to detect ground faults and energizes a shunt trip coil of a circuit breaker solely with energy induced in secondary windings of the differential transformer by the fault current. Uniform time delay is provided regardless of the magnitude of the fault current and means are provided to prevent partial timing out of the time delay circuit at fault currents below the minimum tripping point. The system provides instantaneous tripping of the circuit breaker upon occurrence of large ground fault currents. A switching triac avalanches into conduction upon occurrence of a relatively large ground fault current to protect circuit components from damage while still permitting energization of the shunt trip coil.
摘要翻译：设备保护系统使用差动变压器来检测接地故障，并通过故障电流单独为差分变压器的次级绕组感应的能量激励断路器的并联跳闸线圈。提供均匀的时间延迟，而不管故障电流的大小，并且提供装置以防止在低于最小跳闸点的故障电流下的时间延迟电路的部分定时。该系统在发生大的接地故障电流时提供断路器的瞬时跳闸。当发生相对较大的接地故障电流时，开关三端双向可控硅开关导通，以保护电路部件免受损坏，同时仍然允许并联脱扣线圈通电。

97. 发明授权

US3617808A Electrocution prevention circuit 失效
标题翻译：电脑预防电路
公开(公告)号：US3617808A
公开(公告)日：1971-11-02
申请号：US3617808D
申请日：1970-05-21
申请人： MAX N YODER
发明人： YODER MAX N
IPC分类号： H02H3/33 , H02H3/347 , H02H3/16 , H02H3/28
CPC分类号： H02H3/33 , H02H3/347
摘要： A circuit which prevents accidental electrocution is described. It may be used as an integral part of the electrical service entrance panel or in individual branch circuits, and operates on the principle of interrupting the current in a period of time so short as to prevent ventricular fibrillation.

98. 发明授权

US3512045A Ground fault responsive apparatus for electric power distribution apparatus 失效
标题翻译：用于电力分配设备的地面故障响应装置
公开(公告)号：US3512045A
公开(公告)日：1970-05-12
申请号：US3512045D
申请日：1968-06-28
申请人： GEN SIGNAL CORP , O Z ELECTRICAL MFG CO INC
发明人： TIPTON WILLIAM C , PHILIBERT ROBERT A , SANGER DAVID M
IPC分类号： H01F38/38 , H01H83/14 , H02H1/04 , H02H3/347 , H02H3/28
CPC分类号： H01F38/38 , H01H83/144 , H02H1/04 , H02H3/347

99. 发明授权

US3284670A Ground fault responsive control means for an electric circuit recloser or the like 失效
标题翻译：用于电路重合器等的接地故障响应控制装置
公开(公告)号：US3284670A
公开(公告)日：1966-11-08
申请号：US28818663
申请日：1963-06-17
申请人： GEN ELECTRIC
发明人： FAIRMAN PHILIP B , STREATER AUGUST L
IPC分类号： H01H75/04 , H01H83/14 , H02H3/347
CPC分类号： H01H83/144 , H01H75/04 , H02H3/347

100. 发明授权

US3107318A Protective circuit arrangement 失效
标题翻译：保护电路布置
公开(公告)号：US3107318A
公开(公告)日：1963-10-15
申请号：US80551659
申请日：1959-04-10
申请人： GARRETT CORP
发明人： LYTLE ELVIN D
IPC分类号： H02H3/10 , H02H3/347 , H02H5/04
CPC分类号： H02H5/047 , H02H3/10 , H02H3/347

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