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1. 发明专利

JPH0282167A CURRENT MEASURING INSTRUMENT WITH OPTICAL SYSTEM 失效
公开(公告)号：JPH0282167A
公开(公告)日：1990-03-22
申请号：JP23466288
申请日：1988-09-19
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： TAKAHASHI GENJI , HIGAKI MASARU , TAKAI TSUTOMU , KANAI MINORU , TAKAGI ISAO
IPC分类号： G01R15/24
摘要： PURPOSE:To measure currents in the range from the small to the large currents in the manner of using a single magnetooptical element by branching an optical signal outputted from a light detecting element to plural optical signals having the different light intensities and processing the signals with a photoelectric conversion respectively. CONSTITUTION:By the light detecting element 44, optical signals P0, S0 having the components of a P-polarization and a S-polarization among the optical signals A are transmitted to optical branching devices 56, 58 respectively. In the branching devices 56, 58, the signals P0, S0 are branched to the optical signals P1, P2, S1, S2 respectively and set in the relations of P1>P2, S1>S2, P1/P2=S1/S2. Further, the signals P1, S1 are set to correspond to the currents for the measurement in the small currents range, and the signals P2, S2 are set to correspond to those in the large currents range. The signals P1 - S2 are subjected to photoelectric conversion respectively by light receiving elements 68, 72, 70, 74. Voltage signals VA, VB proportional to the current (i) are calculated in the manner of processing the signals CH-1,CH-2 respectively based on the signals P1, S1 and P2, S2 subjected to the photoelectric conversion. Then, the signal VA is outputted up to the time when the signal VA exceeds a rated value, and when it exceeds the rated value, the signals VB is outputted.

2. 发明专利

JPH05107272A THREE-PHASE BATCH TYPE PHOTOCURRENT TRANSFORMER 失效
公开(公告)号：JPH05107272A
公开(公告)日：1993-04-27
申请号：JP29653691
申请日：1991-10-17
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： TAGAWA TSUGUTAKA , YAMAGIWA TOKIO , TAKAHASHI GENJI , HORIDE AKIHIKO
IPC分类号： G01R15/20 , G01R15/24
摘要： PURPOSE:To obtain a three-phase batch type photocurrent transformer with a common closed container miniaturized diametrically. CONSTITUTION:One branch tube 1a is formed diametrically in a common closed container 1 which houses center conductors 2A-2C and photocurrent transformers 3a-3c of three phases and three phases of optical space transmission parts 6A-6C are arranged being concentrated in the branch tube 1a to lead signals from the photocurrent transformers 3A-3C outside the common closed container 1 through optical fibers 5A-5C. In the case of a common closed container having a branch part being protruded diametrically at the end thereof, three phases of the optical space transmission parts are arranged being concentrated at an axial end of the common closed container having the branch part without forming the branch tube 1a.

3. 发明授权

KR820002286B1 SOLID-STATE IMAGE APPARATUS 失效
公开(公告)号：KR820002286B1
公开(公告)日：1982-12-13
申请号：KR790003295
申请日：1979-09-24
申请人： HITACHI LTD
发明人： IZUMITA MORISHI , SATO KAZUHIRO , TAKAHASHI GENJI , UMEMODO MATSUO , AKIYAMA TOSHIYUKI , NAKAHARA SHUSAKU
IPC分类号： H04N5/30
摘要： This solid-state image apparatus consists of photo conversion devices which arrange at a plane, the vertical switching devices whose input terminals connect the photo conversion devices, the horizontal switching devices whose input terminals connect the output terminal of the vertical switching devices, the vertical scanning circuit which projects the vertical scanning pulse in the control terminals of vertical switching devices and the horizontal scanning circuit which projects the horizontal scanning pulse. This apparatus sustains the spikenoise by the horizontal switching device and includes an operating method about the output of a receive terminal.

4. 发明专利

DE3364239D1 APPARATUS FOR OPTICALLY MEASURING A CURRENT 未知
公开(公告)号：DE3364239D1
公开(公告)日：1986-07-31
申请号：DE3364239
申请日：1983-03-07
申请人： HITACHI LTD
发明人： SATO TADASHI , TAKAHASHI GENJI , INUI YOSHIAKI
IPC分类号： G01R15/24 , G01R15/07 , G01R33/032 , G02F1/09
摘要： A current is measured by making use of a rotation of polarization plane in a magnetic field, that is, a Faraday effect. A conductor under measurement is transversely inserted into a center opening of a Faraday effect glass which has at least two total reflection areas on a periphery thereof so that a light directed into the Faraday effect glass is circulated around the conductor and emitted externally. The light emitted from the Faraday effect glass is split into at least two light beams, which are converted to electric signals by photoelectric elements, and A.C. components contained in the electric signals are extracted and compared. The electric signals are corrected based on the comparison result. The present measuring apparatus and method attain high precision current measurement in a stable manner over an extended period.

5. 发明专利

CA2038004C OPTICAL D.C. VOLTAGE TRANSFORMER 未知
公开(公告)号：CA2038004C
公开(公告)日：1994-10-11
申请号：CA2038004
申请日：1991-03-11
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： TAKAHASHI GENJI , SEINO KAZUYUKI , SAITO SADAMU , SATO TADASHI , MORI ETSUNORI , KUROSAWA KIYOSHI , SHIRAI YOSHINORI
IPC分类号： G01R15/24 , G01R19/00 , G01R19/18
摘要： An optical d.c. voltage transformer having an electrooptic medium to which a d.c. electrical field or voltage to be measured is to be applied. The electrooptic medium is adapted for affecting the polarized light from the polarizer by an electrooptical effect to a degree proportional to the strength of the electrical field or voltage. The transformer comprises a photodetector for producing an optical signal proportional to the affected light received from the electrooptic medium, a device for converting the optical signal from the photodetector into an electrical signal, a chopper for pulsating the electrical field or voltage to be applied to the electrooptic medium, in terms of time, a detector for demodulating the electrical signal from the converting device in synchronism with the pulsated electrical field or voltage, and an output unit for visually presenting the demodulated electrical signal similar in polarity to the electrical field or voltage to be measured.

6. 发明专利

CA2038004A1 Optical D.C. Voltage Transformer 未知
公开(公告)号：CA2038004A1
公开(公告)日：1991-09-10
申请号：CA2038004
申请日：1991-03-11
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： TAKAHASHI GENJI , SEINO KAZUYUKI , SAITO SADAMU , SATO TADASHI , MORI ETSUNORI , KUROSAWA KIYOSHI , SHIRAI YOSHINORI
IPC分类号： G01R15/24 , G01R19/00 , G01R19/18
摘要： An optical d.c. voltage transformer having an electrooptic medium to which a d.c. electrical field or voltage to be measured is to be applied. The electrooptic medium affects the polarized light from the polarizer by an electrooptical effect to a degree proportional to the strength of the electrical field or voltage. The transformer includes a photodetector for producing an optical signal proportional to the affected light received from the electrooptic medium, a device for converting the optical signal from the photodetector into an electrical signal, a chopper for pulsating the electrical field or voltage to be applied to the electrooptic medium, in terms of time, a detector for demodulating the electrical signal from the converting device in synchronism with the pulsated electrical field or voltage, and an output unit for visually presenting the demodulated electrical signal similar in polarity to the electrical field or voltage to be measured.

7. 发明专利

JPH0432991B2 失效
公开(公告)号：JPH0432991B2
公开(公告)日：1992-06-01
申请号：JP3277883
申请日：1983-03-02
申请人： HITACHI LTD
发明人： SATO TADASHI , TAKAHASHI GENJI
IPC分类号： G01R15/24 , G01R33/032 , G02B6/00

8. 发明专利

JPH0432989B2 失效
公开(公告)号：JPH0432989B2
公开(公告)日：1992-06-01
申请号：JP21136283
申请日：1983-11-10
申请人： HITACHI LTD
发明人： KANAI MINORU , TAKAHASHI GENJI , SATO TADASHI , INUI YOSHIAKI
IPC分类号： G01R15/24

9. 发明专利

JPH02143173A OPTICAL DC TRANSFORMER 失效
公开(公告)号：JPH02143173A
公开(公告)日：1990-06-01
申请号：JP29706688
申请日：1988-11-24
申请人： HITACHI LTD
发明人： HIGAKI MASARU , TAKAHASHI GENJI
IPC分类号： G01R15/24
摘要： PURPOSE:To make correction constantly for the error caused from temperature characteristic, secular change, etc., by electrically detecting orthogonal two components of a polarized light to which a magnetic or electrical light effect is given by a sensor and processing with a prescribed calculation. CONSTITUTION:The orthogonal two components of the polarized light to which the magnetic effect outputted from a Faraday cell sensor impressed with a AC magnetic file is given, are detected by an analyzer and photoelectric conversion circuits 8, 9 as the electrical signals Ip, Is expressed in equations I, II. Then, AC components of the signals Ip, Is by BPF 101, 102 of arithmetic circuits are divided in a divider 104, whereby a ratio of changing constants k1, k2 is decided. This ratio and DC components of the signals Ip, Is by LPF 105, 106 are calculated in a multiplier 108, subtraction device 109, adding device 110 and divider 111, then a Faraday rotation angle theta1 corresponding to the AC magnetic field is accurately obtained by correcting the error based on the change of constants caused by the temperature characteristic, secular change, etc. The same can be made for an electric field using a Pockels cell sensor.

10. 发明专利

JPS6280921A CAPACITOR BUSHING 失效
公开(公告)号：JPS6280921A
公开(公告)日：1987-04-14
申请号：JP22013785
申请日：1985-10-04
申请人： HITACHI LTD
发明人： TAKAHASHI GENJI , KANAI MINORU , HIGAKI MASARU
IPC分类号： H01B17/28 , G02F1/09

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