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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

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.

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

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.

5. 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.

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