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1. 发明专利

JPH11264766A OPTICAL APPLICATION CURRENT TRANSFORMER 失效
公开(公告)号：JPH11264766A
公开(公告)日：1999-09-28
申请号：JP6811598
申请日：1998-03-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KIUCHI TADASHI , HAYASHIDA HIROSHI , HAKARI TOSHIHISA , NAKAGAMA YOSHIAKI
IPC分类号： H01F38/28 , G01J4/00 , G01R29/08
摘要： PROBLEM TO BE SOLVED: To provide the measurement method of high accuracy particularly with the compensation of the fluctuation of the luminous quantities of the light sources in an optical application current transformer. SOLUTION: In the total composition for making two lights perpendicular to each other incident on a Faraday rotator 6, and calculating the sum and difference thereof, a part of the luminous quantities of the light sources 7, 7a are branched by the optical branch devices 9, 9a to measure the same, so that the luminous quantities of the light sources are monitored to be used as the reference light, and the dividing operation with the signal light transmitting the Faraday rotator 6 is executed. As a ratio of the reference light monitored by the optical branch devices 9, 91 and the signal light transmitting through the Faraday rotator 6 is constant even when the luminous quantities of the light sources 7, 7a are fluctuated, the fluctuation of the luminous quantities can be compensated by the dividing operation of the same.

2. 发明专利

JPH10257800A AC-EXCITED MOTOR GENERATOR AND ITS OPERATION METHOD 失效
公开(公告)号：JPH10257800A
公开(公告)日：1998-09-25
申请号：JP5354397
申请日：1997-03-07
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： ENDO MASAICHI , YASAKA YASUHIRO , MAOKA AKIHIRO , FUTAMI MOTOO , ICHINOSE MASAYA , UNO SEINOSUKE , HAYASHIDA HIROSHI , NISHIO TORU , MINOGUCHI KIYOSHI , RIYOUMAN AKIRA
IPC分类号： H02P9/00
摘要： PROBLEM TO BE SOLVED: To provide an AC-excited motor generator that can extend a stable operation range even in a range of shortage excitation, and its operation method. SOLUTION: In the operation method of an AC-excited motor generator where a current controller 18 of an AC-excited generator 3 controls a current by dividing into a q-axis current component for controlling an effective power and a d-axis current component for controlling a reactive power, a primary voltage phase operator 21 that calculates a voltage phase θv of a primary voltage based on the output of the above power detector, a rotor phase detector 12 that detects a rotary angle θr being indicated by the electrical angle of the AC-excitated generator 3, a phase detector 20 that calculates a difference between the voltage phase θv and the rotary angle θr (θs =θv -θr ) are provided, thus controlling the current controller 18 so that the speed of the secondary current of the AC-excited generator 3 becomes faster than the change in the angular velocity of the rotor.

3. 发明专利

JPH11108964A OPTICAL CURRENT TRANSFORMER 失效
公开(公告)号：JPH11108964A
公开(公告)日：1999-04-23
申请号：JP26646597
申请日：1997-09-30
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KAWASHIMA KEIZABURO , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI
IPC分类号： G01R33/032 , G01R15/24
摘要： PROBLEM TO BE SOLVED: To provide an optical current transformer in which the reflective surface of a peripheral integration type optical CT sensor is protected by a simple structure and the possibility of contamination or damage on the reflective surface is lessened. SOLUTION: The transformer comprises a Faraday effect glass 1 having a central hole penetrating a conductor and an optical path 4 surrounding the through hole. The Faraday effect glass 1 has a reflective surface 5a bending the optical path at right angle and a protective glass 6a is bonded to the reflective surface 5a through air layers 7a-7c. The air layers 7a-7c is conducted with the outer air or enclosed by filling dry air, as required. The protective glass can be provided on the reflective surface by simple structure through the air layers and since the reflective surface is not exposed, handling is facilitated. Consequently, the possibility of contamination or damage on the reflective surface can be lessened significantly.

4. 发明专利

JPH07134929A POWER UNIT 失效
公开(公告)号：JPH07134929A
公开(公告)日：1995-05-23
申请号：JP27834293
申请日：1993-11-08
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： YAMAGIWA TOKIO , ANNO KENJI , ISHIKAWA TOSHIO , ENDO FUMIMASA , MORIMOTO ATSUO , HAYASHIDA HIROSHI
IPC分类号： H02G5/06 , H01H33/00
摘要： PURPOSE:To provide a small power unit of high reliability by restricting a switching surge such as a disconnector surge having a wide range high frequency component. CONSTITUTION:Central conductors 2, 3 are insulated and supported with insulating spacers 5 in a ground tank 1, and a magnetic substance 20 made of amorphous and a magnetic substance 30 made of ferrite are fitted around the central conductors 3 in a power unit provided with a disconnector 10. Although the effect of restricting a switching surge in high frequency range is low in the magnetic substance 20, the saturation magnetic flux density of the substance is larger than that of ferrite, and although the saturated magnetic flux density of the magnetic substance 30 is small, the effect of restricting a switching surge in high frequency range is large in the magnetic substance 30, and the switching surge in the high frequency range can be restricted effectively while the required quantity of magnetic substance is limited to a small level by using these magnetic substances 20, 30.

5. 发明专利

JPH11109007A LIGHT APPLIED CURRENT TRANSFORMER 失效
公开(公告)号：JPH11109007A
公开(公告)日：1999-04-23
申请号：JP26981297
申请日：1997-10-02
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KAWASHIMA KEIZABURO , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI
IPC分类号： G01R33/032 , G01R15/24 , H01L31/02
摘要： PROBLEM TO BE SOLVED: To improve the response for detecting the change in quantity of light by multiplying the detection signal of a detection frequency component being obtained from each detection signal according to modulation light at a different frequency by a reference signal and performing AC/DC conversion by the double frequency component to be outputted. SOLUTION: Light with different frequencies from light sources 7 and 7' is applied to a Faraday rotor through each different light branching equipment, optical fiber, convergence lens, and polarizer in different directions. Light whose quantity is changed by the Faraday effect is passed through a polarizer, a convergence lens, and a light branching equipment that differ from previous ones and then light J1 " and J2 " are photoelectrically converted by photoelectric conversion parts 8 and 8'. The signal is multiplied by a reference signal being outputted from phase-adjusting equipment 14 and 14' by multipliers 15 and 15', and the signal is inputted to A/D converters 17 and 17' through filters 16 and 16' for passing each frequency component, thus obtaining each DC signal being subjected to AC/DC conversion. An adder 18 and a subtractor 19 obtain the sum and difference, divide a differential signal by a sum signal by a divider 20, and detects the change in the quantity of light due to the Faraday effect.

6. 发明专利

JPH10248166A STABILIZING APPARATUS FOR AC POWER SYSTEM 失效
公开(公告)号：JPH10248166A
公开(公告)日：1998-09-14
申请号：JP5173797
申请日：1997-03-06
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： YASAKA YASUHIRO , ENDO MASAICHI , FUTAMI MOTOO , MAOKA AKIHIRO , ICHINOSE MASAYA , UNO SEINOSUKE , HAYASHIDA HIROSHI , NISHIO TORU , MINOGUCHI KIYOSHI , RIYOUMAN AKIRA
IPC分类号： H02J3/24 , G05F1/70
摘要： PROBLEM TO BE SOLVED: To provide a stabilizing apparatus, for an AC power system, by which the overvoltage of the AC power system provided with a static power conversion device for linkage such as for frequency conversion or the like is suppressed at a high speed. SOLUTION: A stabilizing apparatus is provided with an AC excitation-type generator-motor 10 in which a primary winding 11 is connected to an AC system 1 via a transformer 5, with an AC excitation device 12 which supplies an AC current to its secondary winding 12 and with an exciting-current control system 20 which comprises a voltage controller 21, an effective-power controller 22 and a current controller 23. When a voltage Vp, at the AC system 1, detected by a voltage detector 9 is raised due to the trip or the like of a static power conversion device 2 so as to become higher than a prescribed voltage Vover, the voltage controller 21 outputs a voltage command Id which suppressed the overvoltage of the system voltage Vp, the reactive voltage of the system is absorbed by the AC excitation-type generator-motor 10, and a rise in a system voltage is suppressed at a high speed.

7. 发明专利

JPH08226939A OPTICAL CURRENT TRANSFORMER 失效
公开(公告)号：JPH08226939A
公开(公告)日：1996-09-03
申请号：JP3233795
申请日：1995-02-21
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KAWASHIMA KEIZABURO , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI , SHIMIZU MAKOTO
IPC分类号： G01R15/24 , G02F1/09
摘要： PURPOSE: To compensate the influence of temperature change on a magnetic optical sensing part of an optical current transformer and perform highly accurate measuring. CONSTITUTION: A Faraday rotator 6 is disposed between two polarizers 4, 5 whose passing polarization directions are different from each other, and a magnetic optical sensing part is constituted. Light is incident on the reverse direction from light transmission parts 2, 2'. Two light sources 7, 7' emitting incident light emit light having same wavelength characteristics, and outgoing light from the magneto-optical sensing part is converted into an electric signal with photoelectric conversion parts 8, 8'. Two beams of light passing the magneto-optical sensing part in mutually opposite directions are intensity- modulated at mutually different frequencies, an intensity-modulated frequency component is selectively extracted from the electric signal after photoelectric conversion, and the change of intensities of the two beams of light by Faraday effect is differentially calculated and found.

8. 发明专利

JPH11264767A OPTICAL APPLICATION CURRENT TRANSFORMER 失效
公开(公告)号：JPH11264767A
公开(公告)日：1999-09-28
申请号：JP6811698
申请日：1998-03-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SONE ISAMU , SHIROKURA TOSHIJI , KIUCHI TADASHI , HAYASHIDA HIROSHI , NAKAGAMA YOSHIAKI , HAKARI TOSHIHISA
IPC分类号： H01F38/28 , G01J4/00 , G01R15/24 , G01R29/08
摘要： PROBLEM TO BE SOLVED: To provide the measurement method of high accuracy with the compensation of the fluctuation of the luminous quantity of a light source. SOLUTION: In the total composition where two lights perpendicular one other are made incident on a Faraday rotator 6 and the sum and different operation thereof is executed, the leakage of the light is measured by the optical branch devices 7, 7a for monitoring the luminous quantities of the light sources to be used as the reference light, and the dividing operation with the signal light passing through the Faraday rotator 6 is executed. As a ratio of the reference light monitored by the optical branch device 9, 9a and the signal light passing through the Faraday rotator 6 is constant even when the luminous quantities of the light sources 7, 7a are fluctuated, the fluctuation of the luminous quantities can be compensated by the dividing operation of the reference light and the signal light.

9. 发明专利

JPH09283739A SEMICONDUCTOR DEVICE MANUFACTURING METHOD 失效
公开(公告)号：JPH09283739A
公开(公告)日：1997-10-31
申请号：JP9264996
申请日：1996-04-15
申请人： MITSUBISHI ELECTRIC CORP , KANSAI ELECTRIC POWER CO
发明人： SATO KATSUMI , HAYASHIDA HIROSHI , NISHIO TORU
IPC分类号： H01L29/74
摘要： PROBLEM TO BE SOLVED: To realize a semiconductor device which is superior in withstanding voltage characteristic and little in power feed loss by irradiating charged particles at specified irradiating rate on at least one principal plane of a semiconductor substrate before heating it over a specified temp. SOLUTION: A principal plane of an n-type Si substrate 100 is irradiated with a proton beam at an irradiation rate of 5×10 cm-2 to from a crystal defect region 100a, impurity ions are implanted and drive-in-diffused at 1250 deg. for 150hrs. to form a p-type base layer 101 and p-type emitter layer 102 and an n-type base layer 103 is formed therebetween, thermal oxide films 100b and 100c are formed on both principal planes of the substrate 100. The oxide film 100b on the layer 101 is selectively removed to deposit an impurity on this layer 101 and the drive-in diffusion is made at 1250 deg. for 10hrs. to form an n-type emitter layer 104. The films 100b, 100c are removed to form a cathode electrode 105 and gate electrode 106 on the principal plane at the p-type base layer 101 and anode electrode 107 on the principal plane at the p-type emitter layer 102. Thus it is possible to realize a high-withstanding voltage thyristor having a low ON-voltage and little power feed loss.

10. 发明专利

JPH0856551A RAT INTRUSION-PREVENTIVE SYSTEM 失效
公开(公告)号：JPH0856551A
公开(公告)日：1996-03-05
申请号：JP20044794
申请日：1994-08-25
申请人： OYOYODO KAKO KK , KANSAI ELECTRIC POWER CO
发明人： FUKUI NOBUYUKI , MORITA HISAFUMI , MORIMOTO ATSUO , HAYASHIDA HIROSHI
IPC分类号： A01M29/00 , A01M29/16 , A01M29/18
摘要： PURPOSE: To provide a rat intrusion-preventive system capable of preventing rats from becoming accustomed to sound because of generating multiphase waves, thus enabling rat intrusion preventive effect to be maintained over a long period. CONSTITUTION: When a door is detected to be 'on' by a door switch 50, ultrasonic wave oscillation circuits 30 and 102 are actuated, piezoelectric buzzers 24a, 24c, 24e are driven by the oscillation circuit 30, while buzzers 24b, 24d, 24f by the circuit 102. Therefore, continuous waves are outputted at a constant sound pressure from the buzzers 24a, 24c, 24e, while intermittently descending waves from the buzzers 24b, 24d, 24f so that the sound pressure is gradually decreased intermittently at a constant period.

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