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1. 发明专利

JPH0727813A PLOTTING METHOD FOR ACCIDENT POINT OF POWER CABLE 失效
公开(公告)号：JPH0727813A
公开(公告)日：1995-01-31
申请号：JP19546093
申请日：1993-07-12
申请人： SUMITOMO ELECTRIC INDUSTRIES , TOKYO ELECTRIC POWER CO
发明人： MIYAMOTO TOSHIHARU , MURATA YOSHIKAZU , SASAKI TATSUO , IIDA SHUNICHI
IPC分类号： G01R31/08 , H01B9/00
摘要： PURPOSE:To provide a method for plotting accident points of power cables by which the plotting distance error can be reduced. CONSTITUTION:In the method for plotting accident points of power cables by which the distance to an accident point is plotted by detecting a surge current generated when a ground accident occurs in a power cable buried underground with current sensors 7, 8, and 9 provided in insulation joint boxes and terminal joint box provided at multiple points and measuring the arriving time lags of the surge current at each sensor 7, 8, and 9 by utilizing a light emitting element and optical fibers 11, optical attenuators 13 are connected to the optical fibers 11 so as to adjust the optical losses of the fibers 11 to become equal to each other.

2. 发明专利

JPH06289067A CURRENT DETECTOR FOR FAULT POINT LOCATOR 失效
公开(公告)号：JPH06289067A
公开(公告)日：1994-10-18
申请号：JP9528193
申请日：1993-03-30
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MIYAMOTO TOSHIHARU
IPC分类号： G01R19/14 , G01R31/08 , H02H3/22 , H02H7/26
摘要： PURPOSE:To transmit information of surge occurring timing (first wave of a surge current) and a commercial frequency component (amplitude and phase) by one LED in a fault current detector for a fault detecting apparatus of a transmission line. CONSTITUTION:A high-pass filter 3 and a low-pass filter 4 are respectively connected to the output terminals of two wound-core CTs or a wound-core CT having two windings wound on the same core, a full-wave rectifier 5 is connected to the output side of the filter 3, a half-wave rectifier 6 is connected to the filter 4, the polarities of the outputs of both the rectifiers are matched and an LED 7 is connected.

3. 发明专利

JPH06235748A FAULT LOCATOR FOR POWER CABLE 失效
公开(公告)号：JPH06235748A
公开(公告)日：1994-08-23
申请号：JP4593693
申请日：1993-02-10
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MIYAMOTO TOSHIHARU , MURATA YOSHIKAZU
IPC分类号： G01R31/08 , H01B9/00
摘要： PURPOSE:To realize space saving and cost reduction by arranging a current sensor so that the magnetic path thereof surrounds three-phase conductors integrally thereby decreasing the number of current sensors. CONSTITUTION:A current sensor 3 is arranged while integrating a three-phase power cable 1 and a sheath bond wire 4 using insulation joint boxes 2 in a manhole A, for example. It is similarly applied to a terminal joint box of GIS and a Y-branch insulation joint box in manhole. Since a single three-phase current sensor is employed for power cable, space is saved and cost is reduced. Surge current flowing on an underground power cable is detected by current sensors arranged in the insulation joint boxes 2 or the terminal joint boxes installed at a plurality of points and then a fault is located by measuring the difference of arriving time of surge current between the current sensors 3.

4. 发明专利

JPH04193029A FAULT DETECTOR FOR HIGH VOLTAGE DISTRIBUTION LINE 失效
公开(公告)号：JPH04193029A
公开(公告)日：1992-07-13
申请号：JP32170490
申请日：1990-11-26
申请人： SUMITOMO ELECTRIC INDUSTRIES , KANSAI ELECTRIC POWER CO
发明人： YASUO HIROYUKI , MIYAMOTO TOSHIHARU , MIURA AKIHIRO
IPC分类号： G01R31/02 , H02H7/26
摘要： PURPOSE:To obtain a fault detector for high voltage distribution line comprising reduced number of components including an inexpensive CPU by providing a first control circuit for performing gain control of a gain amplifier and a second control circuit for making decision of fault. CONSTITUTION:A CPU 55 provides a D/A converter 57 with gain regulation signals for at least two out of three variable gain amplifiers 10, 11, 12 in order to regulate the zero-phase voltage to a value for judging a fault. Furthermore, the CPU 55 provides a D/A converter 58 with gain regulation signals for at least two out of three variable gain amplifiers 16, 17, 18 in order to regulate the zero-phase current to a value for judging a fault. The D/A converters 57, 58 degitize the input gain regulation signals and regulate the gains of the variable gain amplifiers 10, 11, 12 and 16, 17, 18, respectively. A CPU 56 then performs ground fault judging operation based on digital zero-phase voltage and zero-phase current signals.

5. 发明专利

JPH0452571A METHOD FOR DETECTING ACCIDENT SECTION OF POWER CABLE 失效
公开(公告)号：JPH0452571A
公开(公告)日：1992-02-20
申请号：JP16319890
申请日：1990-06-21
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： FUJIEDA TAKASHI , IKO KOJI , MIYAMOTO TOSHIHARU
IPC分类号： G01R31/08
摘要： PURPOSE:To enable an accident section to be detected in a short time by mounting at least one pair of vibration detection elements on a power cable with a gap and by determining the direction of occurrence of accident by detecting the order and time difference where each element detects vibration. CONSTITUTION:A pair of vibration detection elements 31 and 32 are mounted on a power cable 1 with an arbitrary gap (d). If an accident occurs on the right side of the element 31, mechanical vibration within the cable 1 is propagated from the right side to the left side. Electric wave propagation speed of this cable 1 is 1,500m/sec. If the gap between the elements 31 and 32 is set to 1m, output is produced at each vibration detection element with a time difference of i/1,500 0.67m/sec. This time difference is utilized to drive a set/reset flip-flop circuit and trailing edge of the output Q is detected to operate a mono-stable multivibrator, thus enabling the location of the accident to be determined, namely on the right side of the element 31, on the left side, or in-between. By transferring this judgment result from a slave station to the master station, the location of the accident point can be known.

6. 发明专利

JPH0337584A MAGNETIC FIELD SENSOR 失效
公开(公告)号：JPH0337584A
公开(公告)日：1991-02-18
申请号：JP17141289
申请日：1989-07-03
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MIYAMOTO TOSHIHARU
IPC分类号： G01R33/032 , G01R15/24 , G02B6/00
摘要： PURPOSE:To enable detection of a magnetic intensity stable in a wide temperature range by making a phase difference between two axes, X and Y, of a 1/2 wavelength plate at a room temperature larger than pi(180 deg.) when a temperature coefficient of a Faraday effect element is negative. CONSTITUTION:Light 1 introduced from an optical fiber is transmitted through a polarizers 2, a 1/2 wavelength plate 7, a Faraday effect element 4 and an analyzer 5 sequentially. In this case, a rotary polarization element is replaced with the 1/2 wavelength plate 7 and when a temperature coefficient of the Faraday effect element is negative, a phase difference between two axes, X and Y, is made larger than pi in the 1/2 wavelength plate 7 at a room temperature and to the contrary, when the temperature coefficient of the Faraday effect element is positive, the phase difference between the two axes is made smaller than pi. This enables correction of a sensor as a whole in such a direction that the temperature coefficient of the Faraday effect element is down to zero thereby permitting detection of an intensity of a magnetic field stable in a wide temperature range.

7. 发明专利

JPS6439569A OPTICAL MAGNETIC FIELD SENSOR 失效
公开(公告)号：JPS6439569A
公开(公告)日：1989-02-09
申请号：JP19586387
申请日：1987-08-05
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： HOSOE KATSUHIRO , MIYAMOTO TOSHIHARU
IPC分类号： G01R33/032
摘要： PURPOSE:To improve temperature characteristics by interposing 1/4-wavelength plates between a polarizer and a Farady effect element, or the Faraday effect element and an analyzer at 45 deg. to each other. CONSTITUTION:The polarizing element 5 and analyzer 7a are arranged in the same polarizing direction on an optical axis and the Faraday effect element 6 is arranged between them. Further, the 1/4-wavelength plates 9 and 10 are arranged between the polarizer 5 and element 6 while having their axial direction at an angle theta=45 deg. to each other. Then light which is incident from the polarizer 5 becomes single polarized light, which passes through the wavelength plate 9 to generate a 90 deg. phase difference between two optical main axes, thereby generating circular polarized light. The wavelength plate 10 generates a 90 deg. phase difference between two main axial directions while shifting in axial direction by 45 deg. from the wavelength plate 9, so polarized light exiting from the polarizer 5 becomes linear polarized light whose plane of polarization rotates by 45 deg. eventually. When this linear polarized light passes through the element 6, the plane of polarization is rotated by a magnetic field to extract the same polarized component as that of the polarizer 5, and then light which is intensity- modulated almost in proportion to the magnetic field is guided out.

8. 发明专利

JPS62289773A STATIC ELECTRICITY DETECTING DEVICE 失效
公开(公告)号：JPS62289773A
公开(公告)日：1987-12-16
申请号：JP1839386
申请日：1986-01-30
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： TSUJI KOJIRO , NAKASEKO MASARU , MIYAMOTO TOSHIHARU
IPC分类号： G01R15/24 , G01R29/12
摘要： PURPOSE:To detect even a charge in slow migration by providing an integration circuit to the output part of a photoelectric transducer which outputs a voltage proportional to the input voltage of an optical voltage sensor. CONSTITUTION:When the integration circuit is not provided, a phenomenon which is slower than the time constant determined by the insulation resistance of a static electricity detecting device and the electrostatic capacity of an electrode can not be detected. For the purpose, the integration circuit is provided to find an electrode voltage approximately within a specific range even as to a charge in slow migration. When the detection range is widened, the time constant on the sensor side is decreased and the time constant of an integrator 32 is increased.

9. 发明专利

JPS61264239A MOISTURE SENSOR 失效
公开(公告)号：JPS61264239A
公开(公告)日：1986-11-22
申请号：JP10643085
申请日：1985-05-17
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MIYAMOTO TOSHIHARU , USAMI HIROSHI
IPC分类号： G01N21/3554
摘要： PURPOSE:To make possible the constitution of a linear monitoring system by making use of the characteristic that attenuation arises in the light transmitting a quartz optical fiber doped with P2O5 in the wavelength region above the specific wavelength if said optical fiber is in a submerged region. CONSTITUTION:The exit light from a long wavelength light source 6 having >=1.0mum wavelength and short wavelength light source 6' having =1.0mum wavelength and short wavelength light having =1.0mum wavelength is therefore divided by the light output having

10. 发明专利

JPS61185721A OPTICAL VOLTAGE ADDER 失效
公开(公告)号：JPS61185721A
公开(公告)日：1986-08-19
申请号：JP2741185
申请日：1985-02-14
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MITSUI TSUTOMU , MIYAMOTO TOSHIHARU , HOSOE KATSUHIRO
IPC分类号： G02F1/03 , G01R19/10
摘要： PURPOSE:To detect easily a residual voltage on a polyphase AC distribution line with a simple constitution by adding optically plural voltages by one optical voltage adder to obtain intensity modulation of light dependent upon the sum of individual voltages. CONSTITUTION:The light incident on a polarizer 1 is polarized linearly and is subjected to phase modulation proportional to the sum of modulating voltage VA, VB, and VC from three-phase AC distribution lines lA, lB, and lC by the Pockels effect when passing Pockels elements 2A, 2B, and 2C and becomes an elliptically polarized light. This elliptically polarized light passes a 1/4 wave plate 3 and an analyzer 4 to become a linearly polarized light again. Since the elliptically polarized light is changed in accordance with the sum of modulating voltage VA, VB, and VC, it is converted to the change of the intensity of light through the analyzer 4. The output light from the analyzer 4 passes an optical fiber 7 and is converted to an electric signal proportional to the intensity of the output light by a photo diode 10 of a transducer 8 and is outputted as the sum of modulating voltage VA, VB, and VC, it is converted to the change of the intensity of light through the analyzer 4. The output light from the analyzer 4 passes an optical fiber 7 and is converged to an electric signal proportional to the intensity of the output light by a photo diode 10 of a transducer 8 and is outputted as the sum of modulating voltage VA, VB, and VC, namely, the residual voltage. Thus, the residual voltage is detected easily by the simple constitution.

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