JPH02184765A - Detector for 3-phase ac current - Google Patents
Detector for 3-phase ac currentInfo
- Publication number
- JPH02184765A JPH02184765A JP1003570A JP357089A JPH02184765A JP H02184765 A JPH02184765 A JP H02184765A JP 1003570 A JP1003570 A JP 1003570A JP 357089 A JP357089 A JP 357089A JP H02184765 A JPH02184765 A JP H02184765A
- Authority
- JP
- Japan
- Prior art keywords
- current
- phase
- outputs
- output
- current detector
- 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.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 abstract description 17
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、三相交流電流の監視等のために用いられる
三相交流用電流検出器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a three-phase AC current detector used for monitoring three-phase AC current.
［従来の技術］
第３図は従来の三相交流用電流検出器の構成図、第４図
はその外観図である。従来の三相交流用電流検出器は、
第１電流検出器１．第２電流検出器２及び第３電流検出
器３により構成されている。[Prior Art] FIG. 3 is a block diagram of a conventional three-phase AC current detector, and FIG. 4 is an external view thereof. The conventional three-phase AC current detector is
First current detector1. It is composed of a second current detector 2 and a third current detector 3.
第１電流検出器１は、第１入力端子Ｉｌｌに磁気結合し
た第１鉄心１１、第１鉄心１１の磁路の中に設置された
第１ホール素子１２、第１ホール素子１２に電流を供給
する第１電流源１３、第１ホール素子１２の出力を受は
増幅して第１変換出力ＩＯ，を出力する第１増幅器１４
により構成されている。同様に、第２電流検出器２は、
第２鉄心２１、第２ホール素子２２．第２電流源２３及
び第２増幅器２４を備え、第２入力端子Ｉ−２を入力と
して第２変換出力ＴＯ２を出力し、第３電流検出器３は
、第３鉄心３１．第３ホール素子３２．第３電流源３３
及び第３増幅器３４を備え、第３入力端子Ｉｔｓを入力
として第３変換出力ＩＯＳを出力する。The first current detector 1 supplies current to a first iron core 11 magnetically coupled to a first input terminal Ill, a first Hall element 12 installed in a magnetic path of the first iron core 11, and a first Hall element 12. a first current source 13 that receives and amplifies the output of the first Hall element 12 and outputs a first conversion output IO.
It is made up of. Similarly, the second current detector 2 is
Second iron core 21, second Hall element 22. The third current detector 3 includes a second current source 23 and a second amplifier 24, receives the second input terminal I-2 as an input, and outputs a second conversion output TO2. Third Hall element 32. Third current source 33
and a third amplifier 34, and outputs a third conversion output IOS using the third input terminal Its as an input.
以上のように、従来の三相交流用電流検出器は各相毎に
電流検出器を設け、取付けねじ９で固定しており、各電
源Ｓ及び各変換出力ＩＯ１＋ Ｉ ｏ２゜ＩＯ２を外
部に接続するインターフェース用に各相毎に各４本のコ
ネクタビンが設けられている。As described above, the conventional three-phase AC current detector has a current detector for each phase, is fixed with the mounting screw 9, and connects each power supply S and each conversion output IO1+Io2゜IO2 to the outside. Four connector bins are provided for each phase for the interface.
次に、動作について説明する。第１電流検出器１では、
第１入力電流ｉｔｔの変化を第１鉄心１１中の磁束φの
変化に変換し、第１鉄心１１のギャップ中、すなわち磁
路の中に設置された第１ホール素子１２は第１電源１３
より供給電流を受け、第１鉄心ｌｌ中の磁束φの変化に
応動し、第１入力端子１１．に比例した微小な出力電圧
を出力し、この出力電圧を第１増幅器１４で増幅し第１
変換出力Ｉ０１を出力する。Next, the operation will be explained. In the first current detector 1,
The first Hall element 12 installed in the gap of the first iron core 11, that is, in the magnetic path, converts the change in the first input current itt into a change in the magnetic flux φ in the first iron core 11.
receives a supply current from the first input terminal 11. This output voltage is amplified by the first amplifier 14 and the first
A converted output I01 is output.
第２電流検出器２．第３電流検出器３においても同様に
、それぞれ入力電流’１２＋１１３を検出変換して、変
換出力１０２．１＜１を出力する。Second current detector2. Similarly, the third current detector 3 detects and converts the input current '12+113, and outputs a converted output 102.1<1.
［発明が解決しようとする課題］
従来の三相交流用電流検出器は以上のように構成されて
いるので、３組の電流検出器を備えており、大きな設置
スペースが必要であり、取付の手間が多くかかり、配線
及び接続も多いなどの課題があった。[Problems to be solved by the invention] Since the conventional three-phase AC current detector is configured as described above, it has three sets of current detectors, requires a large installation space, and is difficult to install. There were problems such as a lot of effort and a lot of wiring and connections.
この発明は上記のような課題を解消するためになされた
もので、構造が簡単で、配線及び接続が少なく、小形で
製造コストが低い三相交流用電流検出器を得ることを目
的とする。The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a three-phase AC current detector that has a simple structure, fewer wirings and connections, is small, and has a low manufacturing cost.
［課題を解決するための手段］
この発明に係る三相交流用電流検出器は、３相のうち２
相についてそれぞれ電流を検出し変換し出力する電流検
出手段と、この２個の電流検出手段の出力を入力として
反転加算して出力する反転加算手段とを備えたものであ
る。[Means for Solving the Problems] The three-phase AC current detector according to the present invention has two out of three phases.
The current detecting means detects, converts, and outputs the current for each phase, and the inverting and adding means receives the outputs of the two current detecting means as input, inverts and adds the result, and outputs the result.
［作…］
この発明における三相交流用電流検出器は、２閲の電流
検出手段が３相のうち２相について電流を検出し出力す
るとともに１反転加算手段は前記２個の電流検出手段の
出力を入力として反転加算することにより、三相交流の
平衡理論により、残りの１相の電流の検出出力に相当す
るものを出力する。[Production...] In the three-phase AC current detector according to the present invention, the second current detecting means detects and outputs the current for two of the three phases, and the one inverting and adding means detects and outputs the current of the two current detecting means. By inverting and adding the outputs as inputs, an output corresponding to the detected output of the remaining one phase current is output based on the three-phase AC balance theory.
し実施ＰＡ］
以下、この発明の一実施例を図について説明する。第１
図はこの発明の一実施例による三相交流用電流検出器の
構成図、第２図は第１図の三相交流用電流検出器の模型
的外観図である。第１図において、１は第１電流検出器
であり、１１は第１相電流に磁気結合した第１鉄心、１
２は第１鉄心１１の磁路の中に設置された第１ホール素
子、１３は第１ホール素子１２へ供給する電流の第１電
流源、１４は第１ホール素子１２の出力を受けて第１変
換出力Ｉ ／７１を出力する第１増幅器である。[Embodiment PA] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1st
1 is a block diagram of a three-phase AC current detector according to an embodiment of the present invention, and FIG. 2 is a schematic external view of the three-phase AC current detector shown in FIG. In FIG. 1, 1 is a first current detector, 11 is a first iron core magnetically coupled to the first phase current, 1
2 is a first Hall element installed in the magnetic path of the first iron core 11; 13 is a first current source for supplying current to the first Hall element 12; 14 is a first current source that receives the output of the first Hall element 12; The first amplifier outputs a conversion output of I/71.
２は第２電流検出器であり、同様に、第２鉄心２１、第
２ホール素子２２．第２電流源２３及び第２増幅器２４
を備える。2 is a second current detector, which similarly includes a second iron core 21, a second Hall element 22. Second current source 23 and second amplifier 24
Equipped with
３０は第１変換出力Ｉ０１と第２変換出力■。２とを入
力として、これを反転加算または加算反転する反転加算
回路であり、第３相の変換出力に相当する第３変換出力
Ｉｏ３を出力する。30 is the first conversion output I01 and the second conversion output ■. This is an inverting/adding circuit which inputs 2 and 2 and performs inverting addition or addition/inversion, and outputs a third conversion output Io3 corresponding to the third phase conversion output.
第２図に示すものは、以上の構成要素をまとめて１個の
箱に収納し三相交流用電流検出器としたものの例である
。What is shown in FIG. 2 is an example of a three-phase AC current detector in which the above components are housed in one box.
次に、動作について説明する。第１電流検出器１及び第
２電流検出器２において、それぞれ入力電流１１１＋１
１２を入力として変換出力１０１＋ １０２が出力さ
れる動作については、従来例と同様であるので説明を省
略し、反転加算回路３０の動作について説明する。Next, the operation will be explained. In the first current detector 1 and the second current detector 2, the input current is 111+1, respectively.
The operation of inputting 12 and outputting the converted output 101+102 is the same as in the conventional example, so the explanation will be omitted, and the operation of the inverting and adding circuit 30 will be explained.
相交流電流が平衡状態にあれば、各相の電流の関係とし
て、
Ｔ １１＋ Ｔ ＋２＋ １１ｓ＝ ０か成立する。よ
って、この各相の電流を入力として変換処理して出力さ
れた変換出力においても、Ｉ ０１ ＋ Ｉ ６２ ＋
１ ＋＞３＝ ０が成立する。よって１例えば、ＩＯ
，とＩＯ２とが既知であれば、上式からＩ。３は、
Ｉ ｏ＊＝ （１、）１＋ １６２）または、
ＩＱＳ＝（Ｉｏｓ）＋（−１０２）
となる。If the phase alternating currents are in a balanced state, the relationship between the currents of each phase is as follows: T 11+T +2+ 11s=0. Therefore, even in the converted output obtained by converting the current of each phase as input, I 01 + I 62 +
1 +>3=0 holds true. Therefore 1, for example, IO
, and IO2 are known, I from the above equation. 3 is I o*= (1,) 1+ 162) or IQS=(Ios)+(-102).
このことを回路として具現したものが第１図であり、２
個の電流検出器１及び２によって２相の電流を検出して
変換出力１０１及びＩＯ２を求め、これを入力とし加算
反転または反転加算する反転加算回路３０によって残り
の相の変換出力Ｉ。、を得るようにしたものである。Figure 1 embodies this as a circuit, and Figure 2
Current detectors 1 and 2 detect two-phase currents to obtain conversion outputs 101 and IO2, which are input to an inverting and adding circuit 30 that adds, inverts, or inverts and adds converted outputs I of the remaining phases. .
なお、３相のうち、どの相の電流を何れの電流検出器で
検出し変換出力を出力させても同様であることは明らか
である。Note that it is clear that the same effect applies regardless of which current detector detects the current of any of the three phases and outputs the converted output.
以上の回路は、同一の電源、同一のグランドレベルで作
動するので、電源及びグランドは共通にすることができ
、第１図、第２図に示すように、外部との接続用のコネ
クタのビンは電源用のものＰＳの２本、グランド用にＰ
Ｇの１本、各相に各１本の出力端Ｐｉ、Ｐ２．Ｐ３の３
本で計６ビンとなり、従来の１２ピンと比較すれば半減
する。The above circuits operate on the same power supply and the same ground level, so the power supply and ground can be shared, and as shown in Figures 1 and 2, there are connector bins for external connections. There are two PS for power supply and P for ground.
G, one output terminal for each phase, Pi, P2 . P3 no 3
There are a total of 6 pins per book, which is half the size of the conventional 12 pins.
なお、反転加算回路３０は、アナログ回路として処理す
るものでもよく、ディジタル回路として構成し、第１電
流検出器１．第２電流検出器２からの入力をＡ 、／
Ｄ変換し、これをディジタル演算処理し、これをり、／
Ａ変換してアナログ量としての第３変換出力Ｉ。、を出
力するように構成してもよい、また、各電流検出器１．
２において各変換出力Ｉ。ｓ、ｒｏ２をディジタル出力
とすれば、反転加算回路３０はディジタル演算回路とし
てよい。Note that the inverting and adding circuit 30 may be processed as an analog circuit, or may be configured as a digital circuit, and the first current detector 1. The input from the second current detector 2 is A, /
D conversion, digital calculation processing, this, /
3rd conversion output I as an analog quantity after A conversion. , and each current detector 1.
2, each conversion output I. If s and ro2 are digital outputs, the inverting and adding circuit 30 may be a digital arithmetic circuit.
なお、上記実施例では、電流検出手段としてホール素子
を用いたが、例えば、抵抗に電流を流し抵抗の両端に発
生する電圧をアイソレーションアンプで増幅するなど、
他の手段を用いても同様な作用効果を奏することは勿論
である。In the above embodiment, a Hall element was used as the current detection means, but for example, a current may be passed through a resistor and the voltage generated across the resistor may be amplified by an isolation amplifier.
Of course, similar effects can be achieved even if other means are used.
［発明の効果］
以上のように、この発明によれば、三相交流の３相のう
ち２相の電流を検出するのみで、この２相の検出値を反
転加算して残りの相を求めるようにしたので、構造は簡
単で、小形で、接続数が少なく、信頼性のあるものが得
られる。[Effects of the Invention] As described above, according to the present invention, only the currents of two phases out of the three phases of the three-phase AC are detected, and the detected values of these two phases are inverted and added to obtain the remaining phases. As a result, the structure is simple, compact, has a small number of connections, and is reliable.
第１図はこの発明の一実施例による三相交流用電流検出
器の構成図、第２図は第１図の三相交流用電流検出器の
模型的外ｍ図、第３図は従来例による三相交流用電流検
出器の構成図、第４図は従来例による三相交流用電流検
出器の外観図である。
図において、１は第１電流検出器、２は第２電流検出器
、３０は反転加算回路である。なお、図中、同一符号は
同一または相当部分を示す。Fig. 1 is a configuration diagram of a three-phase AC current detector according to an embodiment of the present invention, Fig. 2 is a schematic external view of the three-phase AC current detector shown in Fig. 1, and Fig. 3 is a conventional example. FIG. 4 is an external view of a conventional three-phase AC current detector. In the figure, 1 is a first current detector, 2 is a second current detector, and 30 is an inverting and adding circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
力する電流検出手段と、この２個の電流検出手段の出力
を入力として反転加算して出力する反転加算手段とを備
えたことを特徴とする三相交流用電流検出器。The current detecting means detects, converts, and outputs currents for two of the three phases, and the inverting and adding means receives the outputs of the two current detecting means as input, inverts and adds the result, and outputs the result. Three-phase AC current detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003570A JPH0782037B2 (en) | 1989-01-10 | 1989-01-10 | Three-phase AC current detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003570A JPH0782037B2 (en) | 1989-01-10 | 1989-01-10 | Three-phase AC current detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02184765A true JPH02184765A (en) | 1990-07-19 |
| JPH0782037B2 JPH0782037B2 (en) | 1995-09-06 |
Family
ID=11561103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1003570A Expired - Lifetime JPH0782037B2 (en) | 1989-01-10 | 1989-01-10 | Three-phase AC current detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0782037B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005308662A (en) * | 2004-04-23 | 2005-11-04 | Tani Electronics Corp | Overcurrent alarm device |
| JP2007057282A (en) * | 2005-08-23 | 2007-03-08 | Fuji Electric Systems Co Ltd | Current sensor |
| JP2009505056A (en) * | 2005-08-12 | 2009-02-05 | リエゾン、エレクトロニク−メカニク、エルウエム、ソシエテ、アノニム | Three-phase current sensor |
| CN102193020A (en) * | 2010-03-11 | 2011-09-21 | 株式会社田村制作所 | Current detector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57127856A (en) * | 1981-01-30 | 1982-08-09 | Matsushita Electric Ind Co Ltd | 3-phase current detection system |
| JPS61101436U (en) * | 1984-12-07 | 1986-06-28 | ||
| JPS61194370A (en) * | 1985-02-22 | 1986-08-28 | Hioki Denki Kk | Voltage/current detection circuit of multiphase ac line |
-
1989
- 1989-01-10 JP JP1003570A patent/JPH0782037B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57127856A (en) * | 1981-01-30 | 1982-08-09 | Matsushita Electric Ind Co Ltd | 3-phase current detection system |
| JPS61101436U (en) * | 1984-12-07 | 1986-06-28 | ||
| JPS61194370A (en) * | 1985-02-22 | 1986-08-28 | Hioki Denki Kk | Voltage/current detection circuit of multiphase ac line |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005308662A (en) * | 2004-04-23 | 2005-11-04 | Tani Electronics Corp | Overcurrent alarm device |
| JP4674684B2 (en) * | 2004-04-23 | 2011-04-20 | 谷電機工業株式会社 | Overcurrent alarm device |
| JP2009505056A (en) * | 2005-08-12 | 2009-02-05 | リエゾン、エレクトロニク−メカニク、エルウエム、ソシエテ、アノニム | Three-phase current sensor |
| JP2007057282A (en) * | 2005-08-23 | 2007-03-08 | Fuji Electric Systems Co Ltd | Current sensor |
| JP4677856B2 (en) * | 2005-08-23 | 2011-04-27 | 富士電機システムズ株式会社 | Current sensor |
| CN102193020A (en) * | 2010-03-11 | 2011-09-21 | 株式会社田村制作所 | Current detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0782037B2 (en) | 1995-09-06 |
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