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1. 发明专利

JP2007282439A Digital protective relay and its sampling device 有权
标题翻译：数字保护继电器及其采样装置
公开(公告)号：JP2007282439A
公开(公告)日：2007-10-25
申请号：JP2006108521
申请日：2006-04-11
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SUGAWARA YUICHI , SATO SHINDAI , MATSUSHIMA MIHO
IPC分类号： H02H3/02
摘要： PROBLEM TO BE SOLVED: To provide a digital protective relay exhibiting high control precision and operating stably, and to provide its sampling device. SOLUTION: In the sampling device 10A of a digital protective relay 1A, a channel switch 12 switches input channels A1-A6 and outputs a detection signal, and an A-D converter 13 samples the detection signal to generate sampling data. A first storage element and a second storage element can store the sampling data at least of the input channels A1-A6. A control section 11 performs switching of a data input switch 14 to the first storage element 15 side and switching of a data output switch 17 to the second storage element 16 side, and switching of the data input switch 14 to the second storage element 16 side and switching of the data output switch 17 to the first storage element 15 side alternately every sampling period. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供具有高控制精度和稳定运行的数字保护继电器，并提供其采样装置。解决方案：在数字保护继电器1A的采样装置10A中，通道开关12切换输入通道A1-A6并输出检测信号，A-D转换器13对检测信号进行采样以产生采样数据。第一存储元件和第二存储元件可以存储至少输入通道A1-A6的采样数据。控制部分11执行将数据输入开关14切换到第一存储元件15一侧并将数据输出开关17切换到第二存储元件16侧，并将数据输入开关14切换到第二存储元件16侧并且每个采样周期交替地切换数据输出开关17到第一存储元件15一侧。版权所有（C）2008，JPO＆INPIT

2. 发明专利

JPH05176448A POWER SYSTEM PROTECTOR 失效
公开(公告)号：JPH05176448A
公开(公告)日：1993-07-13
申请号：JP33844391
申请日：1991-12-20
申请人： HITACHI LTD
发明人： FUNATO TAKU , WAKASA FUMIO , FUJITA YASUNOBU , MATSUSHIMA MIHO
IPC分类号： H02H7/22 , H02H7/26
摘要： PURPOSE:To enable power stop range to be limited only to the system where an accident has occurred by tripping only the breaker of the system where a fault has fault occurred after tripping the bus communication breaker by a logical circuit when a occurs in one bus. CONSTITUTION:When a grounding fault occurs in the first bus 12, grounding detection signals are output from the detectors 42A, 44A, and 46A of grounding protective relays 42, 44, and 46, and the first and second start signals are output at the same time, respectively, from the AND gates 50 and 56 of a logical circuit 48, and the first timers 52 and the second timer 58 are started. Next, a bus communication breaker 28 is tripped by a trip driver 46B. For this sake, the output of the grounding detection signal from the detector 44A is stopped, and the timer 58 stops. On the other hand, when the start signal is input continuously for a certain time to the timer 52, a timer signal is output, and concurrently when a trip detector 62 detects that the breaker 28 has tripped, a trip signal is output from a gate 54, and the first breaker 14 is tripped.

3. 发明专利

JPH09103029A PROTECTION SYSTEM FOR POWER SYSTEM 失效
公开(公告)号：JPH09103029A
公开(公告)日：1997-04-15
申请号：JP25974295
申请日：1995-10-06
申请人： HITACHI LTD
发明人： FUNATO TAKU , MATSUSHIMA MIHO , SAWAIRI MITSUO
IPC分类号： H02H3/00 , H02H7/26
摘要： PROBLEM TO BE SOLVED: To protect a power system against overload upon malfunction of distribution circuit breaker or the like by interrupting an upstream circuit breaker immediately upon satisfaction of AND conditions that a fault current is flowing on the power system side due to a fault occurring on the power system side and that a downstream circuit breaker and the protective relay thereof do not function even upon elapse of an operating time. SOLUTION: When AND conditions are satisfied that a fault current IF2 is flowing due to occurrence of a short circuit fault at point F2 , for example, and that distribution circuit breaker 52D does not function even upon elapse of the operating time thereof, a power receiving circuit breaker 52A functions to open. An operating time becoming shorter than a normal operating time upon satisfaction of AND conditions is programmed in the processing section of each protection system. The power system can be protected similarly against overload on the load 19 side.

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