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61. 发明专利

JPH03156337A METHOD FOR DETECTING FAULT POINT IN OPTICAL FIBER, OPTICAL-FIBER MACHINING METHOD USING THIS METHOD AND EXTENDING METHOD OF OPGW 失效
公开(公告)号：JPH03156337A
公开(公告)日：1991-07-04
申请号：JP29663589
申请日：1989-11-15
申请人： HITACHI CABLE
发明人： MINAFUJI JUNICHI , HASHIBA KEIICHI
IPC分类号： G01M11/00 , G02B6/00 , G02B6/46
摘要： PURPOSE:To detect the fault point in a moving optical fiber by moving a time-division sampling time in response to the moving distance of the moving optical fiber in time, and performing multiple averaging for signals at a stationary position in space. CONSTITUTION:When breakdown occurs in an optical fiber 1, a pulse signal P is inputted into the optical fiber 1 through a directional coupler 12 from a pulse light source 11 based on the command from a timing adjustor 17. The signal P undergoes Fresnel reflection at the wire breakdown part, and backward scattering light P' is returned. The returned signal P' is separated and extracted with the coupler 12. The signal is transduced into an electric signal through a photodetector 12. The signal passes through an amplifier 14 and undergoes time-division multiple averaging in an adding and memory device 15. The result is displayed on a CRT 16. In this optical- fiber fault-point detector 10, the timing of the adjustor 17 is moved in response to the moving distance of the optical fiber 1. Thus, the multiple averaging for the signals P' from the stationary fault position in space can be performed. Therefore, the fault point of the moving optical fiber can be accurately detected as if the fault point were the stationary point.

62. 发明专利

JPH0337696B2 失效
公开(公告)号：JPH0337696B2
公开(公告)日：1991-06-06
申请号：JP609684
申请日：1984-01-17
申请人： HITACHI CABLE
发明人： KANAMARU KIMIHARU , MINAFUJI JUNICHI , SAKAGUCHI HARUNORI
IPC分类号： G01K11/12 , G01K11/14

63. 发明专利

JPH0385466A CONTACT TYPE PHASE DETECTOR 失效
公开(公告)号：JPH0385466A
公开(公告)日：1991-04-10
申请号：JP22156089
申请日：1989-08-30
申请人： TOHOKU ELECTRIC POWER CO , HITACHI CABLE
发明人： YAMADA AKIMARO , MATSUBARA SUKESHIGE , MINAFUJI JUNICHI
IPC分类号： G01R25/00 , G01R29/16 , G01R29/18
摘要： PURPOSE:To detect a phase in low cost by bringing a phase sensor into contact with a transmission line by an insulating rod and detecting a phase as an ON/ OFF signal. CONSTITUTION:When a voltage phase sensor 14 is supported by an insulating rod 8 and a contact electrode 18 in brought into contact with an overhead wire, the potential difference proportional to overhead wire voltage is generated at both terminals of the resistor element 21 between the electrode 18 and a stray electrode 19. When this potential difference is limited to several V by a voltage limiting element 20, the output of an ON/OFF binary value advanced by 90 deg. in phase from the stringing voltage is obtained. Since output impedance is extremely high, a data transmission means 17 uses an FET 22 as a switching element to obtain the ON/OFF signal of an LED 24. A pair of sensors 14 are brought into contact with an arbitrary one of overhead wires 1, 2, 3 and an arbitrary one of overhead wires 4, 5, 6 and the optical outputs of the sensors 14 are transmitted to the judging circuit 16 on the ground through an optical fiber 15. Whereupon, the circuit 16 can judge whether the phases thereof coincide with each other.

64. 发明专利

JPH0317108B2 失效
公开(公告)号：JPH0317108B2
公开(公告)日：1991-03-07
申请号：JP21164482
申请日：1982-12-02
申请人： HITACHI CABLE
发明人： TANNO SHIRO , ANDO YORIO , SATO HIDEO , MINAFUJI JUNICHI , UCHIDA SHINJI
IPC分类号： G01R31/02

65. 发明专利

JPH02103477A FAULT LOCATOR 失效
公开(公告)号：JPH02103477A
公开(公告)日：1990-04-16
申请号：JP25579488
申请日：1988-10-13
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： OKADA KUNIO , SUGIYAMA KOICHI , MINAFUJI JUNICHI , KANAMARU KIMIHARU
IPC分类号： G01R31/08
摘要： PURPOSE:To gauge a fault point with high reliability by obtaining the distance of said fault point on the basis of memories of waveforms of surge components at a time point when said fault occurs and before and after said time point. CONSTITUTION:The device is comprised of a voltage sensor 4, a sensor data transmission path 7, a trigger generator 82, a memory 81 and an operator 83. When a transmission line 1 is broken in a division d0 to be gauged, the voltage waveform read into the memory 81 from the sensor 4 is consequently changed in a surge component, and similarly a commercial frequency component taken out by the trigger generator 82 is greatly changed. Accordingly, on the basis of informations on the large change of the commercial frequency component, a trigger is generated a predetermined time after the fault occurs, which trigger is added to the memory 81 from the trigger generator 82. When the trigger is added to the memory 81, reading of the transmitted voltage informations is stopped, so that the voltage waveform of each end before and after the fault remains in the memory 81. These waveforms are led to the operator 83. Thus, the time point of the fault and the distance of the fault point are operated from the time point when the shift of the waveforms is observed at both ends.

66. 发明专利

JPH01195376A LIGHTNING CURRENT DETECTOR AND THUNDERBOLT FALL POSITION LOCATING DEVICE USING THIS DETECTOR 失效
公开(公告)号：JPH01195376A
公开(公告)日：1989-08-07
申请号：JP1864488
申请日：1988-01-29
申请人： HITACHI CABLE
发明人： KANAMARU KIMIHARU , NUMAJIRI FUMIYA , MINAFUJI JUNICHI
IPC分类号： G01R31/08 , H02H3/22
摘要： PURPOSE:To accurately detect a lightning current with a simple structure by installing a through-type current transformer on an overhead earth-wire where a lightning current flows and specifying the level of the lightning current in accordance with the operation of an arrester where discharge light emission occurs. CONSTITUTION:A through-type current transformer 2 is installed on an overhead earth-wire 1, and resistance 31 and 32 are connected in series between its output terminals. When a current Il flows in the overhead earth-wire 1 by the occurrence of lightning, a voltage corresponding to the current Il is applied to arresters 41 and 42 through the through-type current transformer 2 and resistances 31 and 32. When the current Il exceeds an operation level I1 of the arrester 41 and an operation level I2 of the arrester 42 together, arresters 41 and 42 emit light by discharge. Consequently, the presence or the absence of discharge light of arresters 41 and 42 is detected through optical fibers 5 by photodetectors 81 and 82, and the level of the lightning current is detected in accordance with the operation level of the arrester where discharge light emission occurs.

67. 发明专利

JPH0126247B2 失效
公开(公告)号：JPH0126247B2
公开(公告)日：1989-05-23
申请号：JP8951382
申请日：1982-05-26
申请人： HITACHI CABLE
发明人： KOIBUCHI SUMIO , KOBAYASHI MASAYUKI , IDE SHIGEO , MINAFUJI JUNICHI
IPC分类号： H02G15/103

68. 发明专利

JPS6337571B2 失效
公开(公告)号：JPS6337571B2
公开(公告)日：1988-07-26
申请号：JP8842282
申请日：1982-05-25
申请人： HITACHI CABLE
发明人： WATABE YOICHI , KOIBUCHI SUMIO , KOBAYASHI MASAYUKI , SATO HIDEO , MINAFUJI JUNICHI
IPC分类号： H02G15/24 , H02G15/30

69. 发明专利

JPS63156439A STATE TRANSMISSION SYSTEM 失效
公开(公告)号：JPS63156439A
公开(公告)日：1988-06-29
申请号：JP30505686
申请日：1986-12-19
申请人： HITACHI CABLE
发明人： YAMAGUCHI YUJI , KANAMARU KIMIHARU , MINAFUJI JUNICHI
IPC分类号： H04B10/07 , H04B10/077 , H04L1/00 , H04L13/00 , H04L29/14
摘要： PURPOSE:To remarkably reduce power consumption for conversion to an optical signal, by arranging a timer in a sensor circuit, setting all of the sensors at detecting states at every prescribed time interval, and transmitting the optical signal after forming the optical signal representing the detecting state in a short optical pulse via an optical fiber. CONSTITUTION:The output (a) of the timer 7 is outputted at every prescribed time interval T1 for a short time, and the detecting state is generated by bringing a part of two conductors of a sensor part into contact with each other by the output. A pulse generator 2 is oscillated by the output, and a light emitting element 3 generates the optical signal (b) of optical pulse string with a pulse cycle of T2. Thus, since the optical signal is sent only in diagnosing by the sensor or at the time of generating abnormality, and simultaneously, the sending of the optical signal is performed at every prescribed time interval T1 as the optical pulse string with time width of T2 by the pulse generators 2 and 8, it is possible to remarkably reduce power required for light emission.

70. 发明专利

JPS62206465A FAULT SECTION LOCATOR FOR AERIAL POWER TRANSMISSION LINE 失效
公开(公告)号：JPS62206465A
公开(公告)日：1987-09-10
申请号：JP4936186
申请日：1986-03-06
申请人： TOKYO ELECTRIC POWER CO , HITACHI CABLE
发明人： SATO ISAO , EGAWA MASANAO , KANO HITOSHI , MINAFUJI JUNICHI , SUGIYAMA KOICHI
IPC分类号： G01R31/08
摘要： PURPOSE:To improve the location accuracy of a fault section, by a method wherein ground fault and short-circuiting fault evaluating functions are calculated for each section and the maximum value of these functions are determined separately to identify the type of a fault and locate the affected section by taking the larger one of the maximum values. CONSTITUTION:A current value/phase extraction circuit 20 analyzes the waveform of a fault current detected for each fixed section with an earth wire current detecting sections 10 to determine the current value and phase thereof. An index computing circuit 30 determines a current value difference and a phase difference within the sections from the current value and the phases obtained with the current value/phase extraction circuit 20 to calculate an index indicating the possibility of a fault for each section. Based on the index, ground fault and short-circuiting evaluate circuits 6 and 7 calculate a ground fault and a short-circuiting fault evaluating function for each section to determine the maximum values of these functions separately. Then, a comparison computing circuit 5 takes the larger one of the maximum value to identify the type of the fault and the locate the affected section.

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