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1.发明授权Electric power system with remote monitoring and control of protective relays 失效具有远程监控和保护继电器控制的电力系统
公开(公告)号：US4972290A
公开(公告)日：1990-11-20
申请号：US414975
申请日：1989-09-29
申请人： Shan C. Sun , John S. Wargo , James P. Garitty
发明人： Shan C. Sun , John S. Wargo , James P. Garitty
摘要： Monitoring and control of analog electromechanical protective relays and digital mcroprocessor based relays is integrated through a system including slave stations which record and time tag contact activity at each of the analog relays. The slave stations continuously retain digital samples of a predetermined number of the most recent cycles of the currents and voltages at the analog relays and when a trip occurs store the retained samples as pre-fault values together with a preset number of post-fault samples. A master station communicates with the slave stations monitoring the analog relays and with the digital relays through a two way communications network. The master station repetitively polls the slave stations and digital relays for contact activity. Detailed data such as the time tags and pre-fault and post-fault currents and voltages are then requested from those stations reporting contact activity. Either the slave stations or master station calculate fault location and type from the fault voltages and currents, an periodically calculate routine metering parameter such as watts and VARs.
摘要翻译： 模拟机电保护继电器和基于数字微处理器的继电器的监测和控制通过包括从站在内的系统进行集成，该从站记录每个模拟继电器的时间标签接触活动。 从站在模拟继电器处连续地保持预定数量的最近的电流和电压周期的数字采样，并且当跳闸发生时，将保留的采样作为预故障值与预设数量的故障后样本一起存储。 主站通过双向通信网络与监控模拟继电器和数字继电器的从站进行通信。 主站重复轮询从站和数字继电器进行接触活动。 然后从报告接触活动的那些站请求诸如时间标签和故障前和故障后电流和电压的详细数据。 从站或主站都可以根据故障电压和电流来计算故障位置和类型，定期计算例如瓦特和VAR的常规测量参数。
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2.发明授权Direct transfer trip apparatus for use with an active pilot wire communications channel 失效直接传输跳闸装置，用于主动导频线通信信道
公开(公告)号：US4675774A
公开(公告)日：1987-06-23
申请号：US808768
申请日：1985-12-13
申请人： Russell W. Gonnam , Shan C. Sun
发明人： Russell W. Gonnam , Shan C. Sun
CPC分类号： H02H7/262
摘要： Direct transfer trip apparatus for sharing a common active communication channel utilized for signal transfer between at least two electromechanical units which form a current differential protective relay for protecting at least one power line in a power system network is disclosed. Each electromechanical unit includes an operating relay coil for effecting an interruption of current through the protected power line when an internal fault of the power line is detected. The direct transfer trip function induces signals to be transmitted through the common active communication channel either upstream or downstream from a faulted power line section where a breaker has failed to open. These direct transfer trip signals are supplied directly to an upstream or downstream breaker unit to operate the breaker to interrupt current through the faulted section independent of the energization of its corresponding operating relay coil. The direct transfer trip apparatus not only performs the aforementioned direct transfer trip function, but also permits disabling of the operating relay coil from effecting a power line interruption inadvertently. Accordingly, an inadvertent current interruption of the power line section by a corresponding operating relay coil is precluded during the transmission of the direct transfer trip signal over the common active communication channel.
摘要翻译： 公开了用于共享用于在形成用于保护电力系统网络中的至少一个电力线路的电流差动保护继电器的至少两个机电单元之间的信号传递的公共有源通信信道的直接传输跳闸装置。 每个机电单元包括操作继电器线圈，用于当检测到电力线的内部故障时，实现通过受保护电力线的电流中断。 直接传输跳闸功能可以在断路器未能打开的故障电源线部分的上游或下游通过通用有源通信信道传输信号。 这些直接传输跳闸信号被直接提供给上游或下游断路器单元，以操作断路器以中断不经其相应的运行继电器线圈通电的故障部分的电流。 直接传输跳闸装置不仅执行上述的直接传输跳闸功能，而且允许操作继电器线圈无效地使电源线中断。 因此，在通过公共有源通信信道发送直接传输跳闸信号期间，排除了相应的操作继电器线圈对电力线路部分的无意的电流中断。
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公开(公告)号：US4471286A
公开(公告)日：1984-09-11
申请号：US367143
申请日：1982-04-09
CPC分类号： H02P9/00
摘要： In a motor-generator set, the frequency of the AC generator outputted voltage is automatically adjusted by field winding regulation of the DC motor, through a closed loop in which a dual-slope converter is charged during a clock-defined time interval in accordance with a potentiometer setpoint, and the charging plus discharging period of the dual slope converter encompasses the period of the outputted voltage.
摘要翻译： 在电动发电机组中，交流发电机输出电压的频率通过直流电动机的励磁绕组调节自动调节，通过闭环，其中双斜率转换器在时钟定义的时间间隔期间根据 电位器设定点和双斜率转换器的充电加放电周期包括输出电压的周期。
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公开(公告)号：US4464697A
公开(公告)日：1984-08-07
申请号：US397758
申请日：1982-07-13
申请人： Shan C. Sun
发明人： Shan C. Sun
CPC分类号： H02H7/262
摘要： Protective relaying apparatus of the pilot type, incorporating a direct transfer trip function (DTT) which reliably and securely utilizes the same communication channel utilized by the pilot relaying function. The DTT function operates within the constraints of a PPM modem, utilizing a signal extracted from the carrier signal, to provide a perfectly synchronized tone for the DTT signal.
摘要翻译： 导频类型的保护中继装置，结合了直接传输跳闸功能（DTT），可靠且可靠地利用导频中继功能使用的相同通信信道。 DTT功能在PPM调制解调器的约束下运行，利用从载波信号提取的信号，为DTT信号提供完美同步的音调。
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5.发明授权
公开(公告)号：US4106071A
公开(公告)日：1978-08-08
申请号：US757178
申请日：1977-01-06
申请人： Shan C. Sun , Larry L. Church
发明人： Shan C. Sun , Larry L. Church
CPC分类号： H02H3/46
摘要： Apparatus for protecting a power system or a portion thereof against the effects of subsynchronous current oscillations is disclosed. A signal representative of or proportional to the subsynchronous current is developed via synchronous modulation and bandpass filter techniques. This signal is fully rectified to produce a waveform from which information can be garnered from both the positive and negative half-cycles.A peak holding and peak status circuit then compares successive peaks of the rectified signal, which circuit is adapted to recognize only those peaks having increasing amplitude. The output of the peak holding and peak status circuit is utilized by three comparator circuits which individually employ differing reference voltage levels for overall evaluation purposes.Given a predetermined frequency range of interest for the subsynchronous current, three timing circuits are used to insure that recognizable peaks of the rectified signal fall into the range of interest and exist for a predetermined evaluation time period. The evaluation time period is automatically changed by one of the comparator circuits if the instantaneous subsynchronous current exceeds its predetermined threshold level. A trip and count signal is then generated by the detection apparatus, regardless of the time period used for evaluation.
摘要翻译： 公开了用于保护电力系统或其部分免受次同步电流振荡的影响的装置。 代表或与次同步电流成比例的信号是通过同步调制和带通滤波技术开发的。 该信号被完全整流以产生可以从正半周期和负半周期获得信息的波形。
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公开(公告)号：US4075559A
公开(公告)日：1978-02-21
申请号：US598611
申请日：1975-07-24
摘要： An input signal supplied to a signal measuring circuit is either amplified or attenuated as necessary to establish the magnitude of the input signal within the defined dynamic range of the measuring circuit and the output signal developed by the measuring circuit is subsequently readjusted through amplification or attenuation to develop an output signal which corresponds to the magnitude of the initial input signal.
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公开(公告)号：US4002977A
公开(公告)日：1977-01-11
申请号：US598609
申请日：1975-07-24
申请人： Shan C. Sun , Anthony G. Chaprnka
发明人： Shan C. Sun , Anthony G. Chaprnka
摘要： An automatic gain control circuit functions to adjust the magnitude of an input signal supplied to a measuring circuit to a level within the dynamic range of the measuring circuit while a log-ratio circuit adjusts the magnitude of the output signal from the measuring circuit to the level of the input signal and optimizes the signal-to-noise ratio performance of the measuring circuit.
摘要翻译： 自动增益控制电路用于将提供给测量电路的输入信号的幅度调整到测量电路的动态范围内的电平，而对数比电路将来自测量电路的输出信号的幅度调整到等级 的输入信号，并优化了测量电路的信噪比性能。
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8.发明授权
公开(公告)号：US4935837A
公开(公告)日：1990-06-19
申请号：US332186
申请日：1989-04-03
申请人： Shan C. Sun
发明人： Shan C. Sun
IPC分类号： H02H7/26
CPC分类号： H02H7/261
摘要： The square wave phase comparison signals generated for each phase of a power distribution system by phase comparison relays at each end of a protected three phase transmission line segment are combined to generate a single, multi-level signal with discrete values for each instantaneous combination of square wave signals. The single, multi-level signal is used to modulate a carrier signal which is transmitted over a single channel of a two-way communications link to the other terminal where the carrier signal is demodulated to reproduce the multi-level signal. The reproduced multi-level signal is then decoded to generate remote square wave signals which are compared with the phase of locally generated square wave signals to generate trip signals for circuit breakers at the respective terminals. Square waves representative of priority functions, such as direct transfer trips, can be integrated into the single, multi-level signal transmitted to the other terminal.
摘要翻译： 通过在受保护的三相传输线段的每个端部处的相位比较继电器为配电系统的每个相产生的方波相位比较信号被组合以产生具有离散值的单个多电平信号，用于每个瞬时的正方形组合 波信号。 单个多电平信号用于调制通过双向通信链路的单个信道发送到载波信号被解调以再现多电平信号的另一终端的载波信号。 然后对再现的多电平信号进行解码以产生与本地生成的方波信号的相位进行比较的远程方波信号，以在各个终端产生断路器的跳闸信号。 代表优先功能的方波，如直接传输跳闸，可以集成到发送到另一个终端的单个多电平信号中。
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公开(公告)号：US4899383A
公开(公告)日：1990-02-06
申请号：US94186
申请日：1987-09-08
申请人： Charles W. Einolf, Jr. , Harold B. Shutterly , Shan C. Sun , Russel W. Gonnam , Roger E. Ray , Karl C. Koch , Pamela M. Maynard-Nenno
发明人： Charles W. Einolf, Jr. , Harold B. Shutterly , Shan C. Sun , Russel W. Gonnam , Roger E. Ray , Karl C. Koch , Pamela M. Maynard-Nenno
CPC分类号： H04J3/0608 , H02H1/0069
摘要： The multiplexer in a multichannel, secure digital communication system repetitively embeds a sequence of byte length uniquely coded synchronizing signals in each of n successive frames of one channel of a multichannel, time multiplexed digital bit stream. Redundant protective relay data and associated parity check data are embedded in four of the n frames in a second, preferably adjacent channel, with the remaining of the n frames in the second channel containing additional of the uniquely coded synchronizing signals. The time multiplexed serial bit stream is transmitted to a remote station, preferably by fiber optic communications media. The most recent bits of the received serial bit stream equal in number to the number of bits spanned by the two channels in n frames are retained in n-1 serially connected serial in, serial out shift registers. Sixteen bit portions, a frame apart, of the retained most recent bits of the serial bit stream are applied to n serial in, parallel out shift registers. The parallel outputs of these shift registers corresponding to the frames of the two channels encoded with the synchronizing signals are compared with the sequence of uniquely coded signals stored in addresses in PROMs. When the compared signals match, which will occur once in every n frames, a synchronization signal is generated and the protective relay data and parity check data are read directly from the other parallel outputs of the serial in, parallel out shift registers. Similar rapid resynchronization of voice and data channels in the time multiplexed serial bit stream can be achieved by counting the number of bits in the bit stream from the generation of the synchronization signal in the relay protection channels to the beginning of the time slot for a selected voice or data channel.
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公开(公告)号：US4698718A
公开(公告)日：1987-10-06
申请号：US802131
申请日：1985-11-26
申请人： Kung C. Chow , Shan C. Sun
发明人： Kung C. Chow , Shan C. Sun
摘要： An electronic protective relay which offers a very sensitive detection of a reverse power condition of a three-phase alternating current generator for the protection against generator motoring is disclosed. A current signal is generated from a current transformer coupled to one phase of the ac generator; and a voltage signal is generated from a potential transformer coupled across the one phase and another phase of the generator. A current input circuit is operative to maintain the phase angle between the voltage and current signals over a wide variation of input current, e.g. from one milliamp to 75 amperes. In addition, a phase-rectification type multiplier affords a relatively simple, but effective method for detecting the power flow direction of the generator. Once the power flow is determined to be in the reverse direction and above a preselected magnitude, a signal indicative of a potential generator motoring condition is geneated. Also included in the relay is an undervoltage detection circuit which operates to disable the generator motoring indication if the generator's voltage has not yet reached or has dropped below an adjustable undervoltage setting. Still further, the relay circuit includes timers in both the undervoltage and reverse power detection areas to insure that their respective conditions persist for a preset time duration in each case before an action is initiated.
摘要翻译： 公开了一种电子保护继电器，其提供用于防止发电机电动机的三相交流发电机的反向功率状况的非常灵敏的检测。 从耦合到交流发电机的一相的电流互感器产生电流信号; 并且从耦合在发电机的一相和另一相的电压互感器产生电压信号。 电流输入电路可操作以通过输入电流的宽变化来维持电压和电流信号之间的相位角，例如， 从一毫安到75安培。 此外，相位整流型乘法器提供了用于检测发电机的功率流动方向的相对简单但有效的方法。 一旦功率流被确定为相反方向并且高于预先选定的幅度，则表示发电机运行状态的信号被表达。 继电器中还包括一个欠电压检测电路，如果发电机的电压尚未达到或低于可调欠压设置，则该电路用于禁用发电机电动指示。 此外，继电器电路包括欠电压和反向功率检测区域中的定时器，以确保它们各自的条件在启动动作之前在每种情况下持续预设的持续时间。
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