JPH01120668U - - Google Patents
Info
- Publication number
- JPH01120668U JPH01120668U JP1475688U JP1475688U JPH01120668U JP H01120668 U JPH01120668 U JP H01120668U JP 1475688 U JP1475688 U JP 1475688U JP 1475688 U JP1475688 U JP 1475688U JP H01120668 U JPH01120668 U JP H01120668U
- Authority
- JP
- Japan
- Prior art keywords
- zero
- sequence current
- light
- guides
- fiber polarizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 claims 1
- 230000005291 magnetic effect Effects 0.000 claims 1
- 230000010287 polarization Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Description
第1図は本考案の零相電流検出装置の原理構成
図。第2図はフアイバ型偏光子の波長―損失特性
グラフ。第3図は従来の零相電流検出装置の原理
構成図。
Sa,Sb,Sc……フアラデー素子、Ca,
Cb,Cc……コア、A,B,C……電線、Ia
,Ib,Ic……電線を流れる電流、Θa,Θb
,Θc……各フアラデー素子でのフアラデー回転
角、Ψa,Ψb,Ψc……隣接フアイバ型偏光子
のオフセツト角、F1〜F4……フアイバ型偏光
子、1……発光素子、2……受光素子、5……モ
ニタ、6……バンドパスフイルタ。
FIG. 1 is a diagram showing the principle configuration of the zero-sequence current detection device of the present invention. Figure 2 is a wavelength-loss characteristic graph of a fiber polarizer. FIG. 3 is a basic configuration diagram of a conventional zero-sequence current detection device. S a , S b , S c ... Faraday element, C a ,
C b , C c ... Core, A, B, C ... Electric wire, I a
, I b , I c ... Current flowing through the wire, Θ a , Θ b
, Θ c ... Faraday rotation angle in each Faraday element, Ψ a , Ψ b , Ψ c ... offset angle of adjacent fiber polarizers, F1 to F 4 ... fiber polarizer, 1 ... light emitting element, 2... Light receiving element, 5... Monitor, 6... Bandpass filter.
Claims (1)
相交流Ia,Ib,Icの零相電流Io=Ia+
Ib+Icを検出するための零相電流検出装置で
あつて、各電線を囲むように設けられ電流に比例
した磁束密度を生ずる同等のギヤツプ付強磁性体
コアCa,Cb,Ccと、地上側に設けられる発
光素子1、受光素子2と、発光素子1の光を第1
のフアラデー素子Saの入力端に導くフアイバ型
偏光子F1と、フアラデー素子Saの出力端から
出る光を第2のフアラデー素子Sbの入力端に導
く第2のフアイバ型偏光子F2と、フアラデー素
子Sbの出力端から出る光を第3のフアラデー素
子Scの入力端に導く第3のフアイバー型偏光子
F3と、フアラデー素子Scの出力端から出る光
を地上側の受光素子2へ導く第4のフアイバ型偏
光子F4とよりなり、隣接するフアイバ型偏光子
F1とF2、F2とF3、F3とF4の固有偏光
方向のオフセツト角Ψa,Ψb,Ψcが全て等し
く0でないようにし、受光素子2で光の強度を電
気信号に変換し、この信号の内の基本周波数成分
から零相電流を求める事を特徴とする零相電流検
出装置。 Zero-sequence current I o = I a + of three-phase alternating current I a , I b , I c flowing through three electric wires A, B , and C separated from each other
A zero-sequence current detection device for detecting I b + I c , which includes equivalent gapped ferromagnetic cores C a , C b , C c that are provided to surround each wire and generate magnetic flux density proportional to the current. Then, the light emitting element 1, the light receiving element 2, and the light emitting element 1 provided on the ground side are connected to the first
a second fiber polarizer F2 that guides light emitted from the output end of the Faraday element Sa to the input end of the second Faraday element Sb ; A third fiber polarizer F3 guides the light emitted from the output end of the Faraday element Sb to the input end of the third Faraday element Sc , and a third fiber polarizer F3 guides the light emitted from the output end of the Faraday element Sc to the ground side. The fourth fiber polarizer F 4 leads to the light receiving element 2, and the offset angle Ψ a of the characteristic polarization direction of the adjacent fiber polarizers F 1 and F 2 , F 2 and F 3 , F 3 and F 4 , Zero-sequence current detection characterized in that Ψ b and Ψ c are all equal and not 0, the light receiving element 2 converts the intensity of light into an electrical signal, and the zero-sequence current is determined from the fundamental frequency component of this signal. Device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1475688U JPH01120668U (en) | 1988-02-05 | 1988-02-05 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1475688U JPH01120668U (en) | 1988-02-05 | 1988-02-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01120668U true JPH01120668U (en) | 1989-08-16 |
Family
ID=31226239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1475688U Pending JPH01120668U (en) | 1988-02-05 | 1988-02-05 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01120668U (en) |
-
1988
- 1988-02-05 JP JP1475688U patent/JPH01120668U/ja active Pending
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