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81. 发明授权

US5337206A Three phase power monitor 失效
标题翻译：三相电源监视器
公开(公告)号：US5337206A
公开(公告)日：1994-08-09
申请号：US775540
申请日：1991-10-15
申请人： Andrew S. Kadah , Andrew M. Nguyen
发明人： Andrew S. Kadah , Andrew M. Nguyen
IPC分类号： H02H3/353 , H02H7/09 , H02H3/26 , H02H3/48
CPC分类号： H02H7/09 , H02H3/353
摘要： A three-phase power monitor operates a contactor between a supply of three phase electrical power and a three phase load. A phase integrity detector has three inputs connected respectively to the three phases of the electrical power. If a loss, reversal, or dissymmetry is detected, a photoemitting device is actuated. Actuation can also result from low or high line frequency. A power supply circuit is input with the three phases of power and has an output providing a dc level corresponding to the voltage level of the three-phase electrical power. A hold circuit has a first time constant associated with it and attains a hold level when current is applied to its input, but reverts to a release level after this current ceases. An interrogator circuit is coupled to the power supply and to the input of the hold circuit and provides a periodic recharge current to the hold circuit at a period that is shorter than the period of the hold circuit. A high/low voltage level detector interrupts the periodic recharge current if the dc level is outside a predetermined voltage limit. A photosensor-based discharge circuit is optically coupled to the photoemitting device of the three phase integrity detector, and is electrically coupled to the hold circuit for discharging the time constant circuit thereof if a phase loss or phase imbalance is detected.
摘要翻译：三相电力监控器在三相电力供应和三相负载之间操作接触器。相位完整性检测器具有分别连接到电力的三相的三个输入端。如果检测到损失，反转或不对称，则启动光发射装置。驱动也可能由低或高线路频率引起。电源电路以三相功率输入，并且具有提供与三相电力的电压电平对应的直流电平的输出。保持电路具有与其相关联的第一时间常数，并且当电流施加到其输入时获得保持电平，但在该电流停止之后恢复到释放电平。询问器电路被耦合到电源和保持电路的输入端，并且以比保持电路的周期短的周期向保持电路提供周期性的再充电电流。如果直流电平超出预定电压极限，则高/低电平电平检测器中断周期性充电电流。基于光电传感器的放电电路光耦合到三相完整性检测器的光发射装置，并且如果检测到相位损失或相位不平衡，则电耦合到保持电路，用于对其时间常数电路进行放电。

82. 发明授权

US4021703A Phase imbalance detection circuit 失效
标题翻译：相位不平衡检测电路
公开(公告)号：US4021703A
公开(公告)日：1977-05-03
申请号：US583219
申请日：1975-06-02
申请人： Wardell Gary , Glenn R. Taylor , Donald S. Kimmel
发明人： Wardell Gary , Glenn R. Taylor , Donald S. Kimmel
IPC分类号： H02H3/02 , H02H3/12 , H02H3/34 , H02H3/353
CPC分类号： H02H3/34 , H02H3/353
摘要： A phase imbalance logic module for a solid state motor protection system for a three-phase motor. Three-phase line currents are converted to corresponding voltages and rectified. The resultant output voltage is a poorly regulated DC voltage having a ripple of approximately 4% during normal operating conditions. In the event of a phase failure, even if not total, the corresponding ripple percentage increases. The phase imbalance logic network senses ripple and provides an output signal to trip a protective circuit breaker if the component of ripple becomes significantly large.
摘要翻译：用于三相电动机的固态电动机保护系统的相位不平衡逻辑模块。三相线路电流转换为相应的电压并整流。所得到的输出电压是在正常操作条件下具有约4％波动的调节不良的直流电压。在相位故障的情况下，即使不是总计，相应的波动百分比也会增加。相位不平衡逻辑网络检测纹波，并提供一个输出信号，以便在纹波分量变得非常大时跳闸保护断路器。

83. 发明授权

US3958153A Method and apparatus for fault detection in a three-phase electric network 失效
标题翻译：用于三相电网故障检测的方法和装置
公开(公告)号：US3958153A
公开(公告)日：1976-05-18
申请号：US469780
申请日：1974-05-14
申请人： Venkat Narayan
发明人： Venkat Narayan
IPC分类号： H02H3/353 , H02H3/28
CPC分类号： H02H3/353
摘要： The voltage-to-ground or neutral of one phase conductor of a three-phase line is compared with the mesh or interphase voltage of the other two phases on an amplitude basis and the comparison result is used to trigger a threshold switch if the former is much smaller than the latter. The threshold switch may be connected to the selector of an excitation system of a network protection assembly or a nonselective excitation system may utilize the outputs of the threshold switches for each of the three comparisons, in order to produce selective triggering of a network protection assembly.

84. 发明授权

US3525019A Power protection apparatus 失效
标题翻译：电源保护装置
公开(公告)号：US3525019A
公开(公告)日：1970-08-18
申请号：US3525019D
申请日：1967-07-20
申请人： JOHN LANSCH
发明人： LANSCH JOHN
IPC分类号： H02H3/347 , H02H3/353 , H02H3/28 , H02H7/00
CPC分类号： H02H3/353 , H02H3/347

85. 发明授权

US3391326A Short-circuit sensor for a single phase of inverter output power 失效
标题翻译：短路传感器用于单相逆变器输出功率
公开(公告)号：US3391326A
公开(公告)日：1968-07-02
申请号：US52274966
申请日：1966-01-24
申请人： UNITED AIRCRAFT CORP
发明人： SIKES RICHARD L , ERNEST LEVY , RONALD GIANNAMORE
IPC分类号： H02H3/24 , H02H3/353 , H02H7/122
CPC分类号： H02H3/353 , H02H3/24 , H02H7/1227

86. 发明授权

US3243796A Three-phase voltage unbalance detector 失效
标题翻译：三相电压不平衡检测器
公开(公告)号：US3243796A
公开(公告)日：1966-03-29
申请号：US27667363
申请日：1963-04-29
申请人： HARMON SHERRIL A , LAURENT JOHN A
发明人： HARMON SHERRIL A , LAURENT JOHN A
IPC分类号： H02H3/353 , H02H7/125
CPC分类号： H02H7/1255 , H02H3/353

87. 发明授权

US3157826A Detector for phase failure in polyphase electrical systems 失效
标题翻译：多相电气系统相位故障检测器
公开(公告)号：US3157826A
公开(公告)日：1964-11-17
申请号：US86288459
申请日：1959-12-30
申请人： POWELL ELECTRICAL MFG COMPANY
发明人： NORTON ROBERT L
IPC分类号： H02H3/353
CPC分类号： H02H3/353

88. 发明授权

US2560217A Grounded phase selector 失效
标题翻译：接地相选择器
公开(公告)号：US2560217A
公开(公告)日：1951-07-10
申请号：US2404148
申请日：1948-04-29
申请人： GEN ELECTRIC
发明人： DEWEY CLYDE G
IPC分类号： H02H3/353
CPC分类号： H02H3/353

89. 发明授权

US11307236B2 Location of a ground fault in an IT network 有权
公开(公告)号：US11307236B2
公开(公告)日：2022-04-19
申请号：US16634048
申请日：2018-06-29
申请人： Siemens Aktiengesellschaft
发明人： Benno Weis
IPC分类号： H02H3/16 , G01R31/08 , H02H3/353 , H02H7/122 , H02H3/50
摘要： A method for locating a ground fault in an IT network which has a converter with a rectifier connected to a power transmission network, a DC link and an inverter connected to an electrical machine includes measuring a common-mode voltage property of the converter or of the power transmission network and comparing the common-mode voltage property with an output voltage property of an output voltage of the inverter. When the IT network experiences a ground fault, the comparison of the common-mode voltage property with the output voltage property is used to determine whether a machine area of the IT network connected downstream of the converter, which includes the electrical machine and a connecting line between the electrical machine and the converter, causes the ground fault.

90. 发明申请

US20190393695A1 A METHOD FOR CONTROLLING A LEAKAGE CURRENT PROTECTION DEVICE IN A PHOTOVOLTAIC APPARATUS 审中-公开
公开(公告)号：US20190393695A1
公开(公告)日：2019-12-26
申请号：US16465366
申请日：2016-11-30
申请人： ABB Schweiz AG
发明人： Marco Belli , Diego Palumbo
IPC分类号： H02H3/353 , H02S40/32 , H02H3/16 , G01R31/02 , H02H7/20
摘要： The application includes a method to control a leakage current protection device in a photovoltaic apparatus, said photovoltaic apparatus being adapted to be electrically connected to an electric power distribution grid having one or more phase voltages at an AC section of the photovoltaic apparatus. The method includes executing a first control procedure to control the leakage current protection device, the first control procedure providing for a comparison of current check values indicative of leakage currents in the photovoltaic apparatus with one or more predefined current threshold values for the leakage currents. The method includes executing a monitoring procedure to check the phase voltages and identify possible relevant positive transients of the phase voltages. If the monitoring procedure identifies relevant positive transients of the phase voltages, one or more new current threshold values for the leakage currents are provided, the execution of the first control procedure is terminated and a second control procedure to control the leakage current protection device is executed, the second control procedure providing for a comparison of the current check values with the new current threshold values for the leakage currents, the second control procedure being executed for a predefined time interval only. After the predefined period of time has passed, the execution of the second monitoring procedure is terminated and the first control procedure is again executed.

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