JPH0222701Y2 - - Google Patents
Info
- Publication number
- JPH0222701Y2 JPH0222701Y2 JP1980054252U JP5425280U JPH0222701Y2 JP H0222701 Y2 JPH0222701 Y2 JP H0222701Y2 JP 1980054252 U JP1980054252 U JP 1980054252U JP 5425280 U JP5425280 U JP 5425280U JP H0222701 Y2 JPH0222701 Y2 JP H0222701Y2
- Authority
- JP
- Japan
- Prior art keywords
- current
- input side
- conductor
- magnetic flux
- iron core
- 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.)
- Expired
Links
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【考案の詳細な説明】
本考案はホール素子等の磁電変換素子を用いた
電流検出器に関するものである。[Detailed Description of the Invention] The present invention relates to a current detector using a magnetoelectric conversion element such as a Hall element.
サイリスタ直流しや断器において、しや断動作
完了後に、主電流がしや断されているか否かを検
出するために数十〜1A程度の微少電流の検出が
必要となる。 In a thyristor DC or disconnector, it is necessary to detect a minute current of several tens to 1 A to detect whether or not the main current is interrupted after the interruption operation is completed.
従来、この種の電流検出器として、第１図に示
すように導体をしや断すべくサイリスタ直流しや
断器が挿入された導体に接続された入力側導体１
を貫通させた鉄心２の空隙部３にホール素子等の
磁電変換素子４を挿入し、この磁電変換素子４で
検出した出力を増幅器５で増幅して出力端子０よ
り検出出力を得る電流検出器が用いられてきた。 Conventionally, this type of current detector has an input side conductor 1 connected to a conductor in which a thyristor direct current or a disconnector is inserted to cut the conductor as shown in Fig. 1.
A current detector in which a magnetoelectric conversion element 4 such as a Hall element is inserted into a gap 3 of an iron core 2 penetrated by the magnetoelectric conversion element 4, and an output detected by the magnetoelectric conversion element 4 is amplified by an amplifier 5 to obtain a detected output from an output terminal 0. has been used.
ところが、この入力側導体１に大電流（例えば
定常通電電流が数百〜数千Ａの場合）を流すと、
第２図に示す如く、電流Ｉ−磁束φの特性曲線か
らわかるようにループイに沿つて磁束φは磁束
φM1に達し飽和する。その後電流Ｉが減少すると
ループイに沿つて磁束φは減少し、電流Ｉが零で
残留磁束Br1となる。この残留磁束Br1が大きい
と、磁電変換素子４たとえばホール素子で検出す
る小電流領域の誤差は大きくなり、電流検出が不
可能となる。 However, when a large current (for example, when the steady current is several hundred to several thousand A) is passed through the input conductor 1,
As shown in FIG. 2, as can be seen from the characteristic curve of current I-magnetic flux φ, the magnetic flux φ reaches the magnetic flux φ M1 along the loop I and is saturated. After that, when the current I decreases, the magnetic flux φ decreases along the loop I, and when the current I becomes zero, the residual magnetic flux Br 1 becomes. If this residual magnetic flux Br 1 is large, the error in the small current region detected by the magnetoelectric conversion element 4, for example, the Hall element becomes large, and current detection becomes impossible.
本考案はこのような問題点を解消するためにな
されたもので、即ち入力側導体が貫通された鉄心
と、該鉄心の空隙部に設けた磁電変換素子とを有
する電流検出器において、前記入力側導体の入力
側端子間に逆並列にして整流ダイオードを接続し
たことを特徴とする電流検出器を提供しようとす
るもので、以下実施例を用いて説明する。 The present invention has been made to solve these problems. Specifically, in a current detector having an iron core through which an input side conductor is passed, and a magnetoelectric conversion element provided in the gap of the iron core, the input This invention aims to provide a current detector characterized in that a rectifier diode is connected in antiparallel between the input side terminals of the side conductor, and will be described below using examples.
第３図は本考案による電流検出器の一実施例を
示し、第１図との相異点は、入力側導体１の入力
側端子I1.I2間に整流ダイオード６ａ，６ｂを逆並
列にして接続したことにあり、その他の構成につ
いては第１図と同様である。 FIG. 3 shows an embodiment of the current detector according to the present invention. The difference from FIG . The other configuration is the same as that shown in FIG. 1.
サイリスタ直流しや断器が挿入された導体に電
流検出器の入力側導体１が接続されるので、サイ
リスタ直流しや断器が挿入された導体に大電流を
流すと入力側導体１にも大電流が流れる。しか
し、本考案では入力側導体１の入力側端子I1，I2
間に整流ダイオード６ａ，６ｂを逆並列にして接
続してあるので、入力側導体１に大電流が流れた
場合、電流検出器の入力側端子I1，I2間の電圧
は、ダイオード６ａ，６ｂの順電圧降下値以下に
抑えられるため、鉄心２の飽和磁束レベルは第２
図のループ口に沿つて増加して小さな値である磁
束φM2となる。この場合、電流Ｉが減少して零と
なつた時の残留磁束はBr2となる。この残留磁束
Br2はきわめて小さくBr2≪Br1で、小電流領域で
の検出誤差は小さくなる。 The input side conductor 1 of the current detector is connected to the conductor in which the thyristor DC current or disconnector is inserted, so if a large current is passed through the conductor in which the thyristor DC current or disconnector is inserted, a large current will also be applied to the input side conductor 1. Current flows. However, in the present invention, the input side terminals I 1 , I 2 of the input side conductor 1
Since the rectifier diodes 6a and 6b are connected in antiparallel between the diodes 6a and 6b, when a large current flows through the input conductor 1, the voltage between the input terminals I1 and I2 of the current detector is 6b, the saturation magnetic flux level of iron core 2 reaches the second level.
The magnetic flux φ M2 increases along the loop opening in the figure and becomes a small value. In this case, the residual magnetic flux when the current I decreases to zero is Br2 . This residual magnetic flux
Br 2 is extremely small, Br 2 << Br 1 , and the detection error in the small current region is small.
このように本考案では大電流通電時に鉄心２の
飽和磁束レベルを小さくおさえ、残留磁束を小さ
くし、小電流領域の誤差を小さくするものであ
る。従つて大電流通電直後の小電流検出が可能と
なる。 In this way, the present invention suppresses the saturation magnetic flux level of the iron core 2 to a low level when a large current is applied, reduces the residual magnetic flux, and reduces errors in the small current region. Therefore, it is possible to detect a small current immediately after applying a large current.
上述したように本考案による電流検出器を用い
れば、次のような種々の効果を奏する。 As described above, if the current detector according to the present invention is used, the following various effects can be achieved.
(1) 小電流領域での検出誤差が小さくなる。(1) Detection error is reduced in the small current region.
(2) 大電流通電直後の小電流検出が可能となる。(2) It is possible to detect small currents immediately after applying large currents.
第１図は従来の電流検出器の一例を示す説明
図、第２図は入力側導体１に流れる電流Ｉ−鉄心
２の磁束φの特性曲線を示す特性図、第３図は本
考案による電流検出器の一実施例を示す説明図で
あつて、図中１は入力側導体、２は鉄心、３は鉄
心の空隙部、４は磁電変換素子、５は増幅器、６
ａ，６ｂは整流ダイオードを示す。
Fig. 1 is an explanatory diagram showing an example of a conventional current detector, Fig. 2 is a characteristic diagram showing the characteristic curve of current I flowing through input side conductor 1 - magnetic flux φ of iron core 2, and Fig. 3 is a diagram showing the current according to the present invention. It is an explanatory diagram showing one embodiment of the detector, in which 1 is an input side conductor, 2 is an iron core, 3 is a gap in the iron core, 4 is a magnetoelectric conversion element, 5 is an amplifier, and 6 is an explanatory diagram showing an embodiment of the detector.
a and 6b indicate rectifier diodes.
Claims (1)
導体を貫通させた鉄心と、該鉄心の空隙部に設け
た磁電変換素子とを有する電流検出器において、
前記入力側導体の入力側端子間に逆並列にして整
流ダイオードを接続したことを特徴とする電流検
出器。 In a current detector having an iron core through which an input side conductor connected to a conductor in which a breaker is inserted, and a magnetoelectric conversion element provided in a gap part of the iron core,
A current detector characterized in that a rectifier diode is connected in antiparallel between the input side terminals of the input side conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980054252U JPH0222701Y2 (en) | 1980-04-21 | 1980-04-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980054252U JPH0222701Y2 (en) | 1980-04-21 | 1980-04-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56155372U JPS56155372U (en) | 1981-11-19 |
| JPH0222701Y2 true JPH0222701Y2 (en) | 1990-06-19 |
Family
ID=29649018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980054252U Expired JPH0222701Y2 (en) | 1980-04-21 | 1980-04-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0222701Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2516205B2 (en) * | 1986-12-25 | 1996-07-24 | 三菱電機株式会社 | Current detector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54138473A (en) * | 1978-04-19 | 1979-10-26 | Masatoshi Kobayashi | Electrical current detector |
-
1980
- 1980-04-21 JP JP1980054252U patent/JPH0222701Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56155372U (en) | 1981-11-19 |
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