JPH0432778A - Current detecting device - Google Patents
Current detecting deviceInfo
- Publication number
- JPH0432778A JPH0432778A JP2138540A JP13854090A JPH0432778A JP H0432778 A JPH0432778 A JP H0432778A JP 2138540 A JP2138540 A JP 2138540A JP 13854090 A JP13854090 A JP 13854090A JP H0432778 A JPH0432778 A JP H0432778A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- current
- line
- pulse signal
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 239000004020 conductor Substances 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000005549 size reduction Methods 0.000 abstract 1
- 239000013585 weight reducing agent Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000005259 measurement 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】
［発明の目的〕
（産業上の利用分野）
この発明は、電力系統や電気回路装置における線路に流
れる電流の大きさを検出する電流検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a current detection device that detects the magnitude of current flowing through a line in a power system or an electric circuit device.
（従来の技術）
例えば送電線、配電線などの電力系統においては、系統
の監視、保護のため、変流器を用いて通電電流の大きさ
を検出している。(Prior Art) For example, in power systems such as power transmission lines and distribution lines, current transformers are used to detect the magnitude of current flowing in order to monitor and protect the system.
（発明が解決１．ようとする課題）
変流器は検出対象である主回路（線路）と絶縁した状態
で電磁誘導により電流値を検出できるという特徴を有す
るが、主回路の線路（−次巻線）に測定回路の線路（二
次巻線）を巻き付ける構造であるため、小型化、軽量化
が難しいという問題があった。特に、第５図に例示する
ようなスイッチギヤ等に変流器を組み込む場合、機器ケ
ースを大型化せざるを得なくなる。なお第５図において
、２１はスイッチギヤの本体ケース、２２は遮断器、２
３は変流器、２４はケーブル、２５は検出対象電流が流
れる主回路の導体、２６は母線である。(Problem 1. to be solved by the invention) Current transformers have the characteristic of being able to detect current values by electromagnetic induction while being insulated from the main circuit (line) to be detected. Since it has a structure in which the measurement circuit line (secondary winding) is wound around the winding, it is difficult to make it smaller and lighter. In particular, when a current transformer is incorporated into a switchgear or the like as illustrated in FIG. 5, the equipment case must be enlarged. In Fig. 5, 21 is the main body case of the switchgear, 22 is the circuit breaker, and 2
3 is a current transformer, 24 is a cable, 25 is a conductor of the main circuit through which the current to be detected flows, and 26 is a bus bar.
この発明は前述の問題点に鑑みなされたもので、その目
的は、検出対象である主回路から電源を取り入れて動作
し、検出出力系を主回路と絶縁できるようにした小型化
、軽量化の容易な電流検出装置を提供することにある。This invention was made in view of the above-mentioned problems, and its purpose is to reduce the size and weight by drawing power from the main circuit that is the object of detection, and by making it possible to isolate the detection output system from the main circuit. An object of the present invention is to provide a simple current detection device.
［発明の構成コ
（課題を解決するための手段）
この発明の電流検出装置は、検出対象である電流が流れ
る既知の抵抗値の導体と、この導体の電圧降下値を検出
、増幅する増幅回路と、この増幅回路の出力を光信号に
変換する電気／光変換回路と、前記光信号を外部に出力
する光ケーブルコネクタと、前記検出対象電流が流れる
線路と大地間に挿入されたコンデンサから入力電圧を得
て前記増幅回路および電気／光変換回路を駆動する電源
回路とを備えたものである。[Structure of the Invention (Means for Solving the Problem) The current detection device of the present invention includes a conductor with a known resistance value through which a current to be detected flows, and an amplifier circuit that detects and amplifies the voltage drop value of this conductor. , an electrical/optical conversion circuit that converts the output of this amplifier circuit into an optical signal, an optical cable connector that outputs the optical signal to the outside, and an input voltage from a capacitor inserted between the line through which the current to be detected flows and the ground. and a power supply circuit for driving the amplifier circuit and the electrical/optical conversion circuit.
（作用）
前記電気／光変換回路から検出対象電流の大きさに対応
した光信号が出力される。前記光ケーブルコネクタに接
続されて前記光信号を受は取る外部回路とは電気的に完
全に絶縁される。(Function) The electrical/optical conversion circuit outputs an optical signal corresponding to the magnitude of the current to be detected. It is electrically completely isolated from an external circuit that is connected to the optical cable connector and receives and receives the optical signal.
（実施例）
第１図は本発明の第１実施例の構成を示している。２は
検出対象電流■が流れる主回路の線路であり、その線路
２上に既知の抵抗値Ｒの導体１がある。増幅回路４は導
体１の電圧降下値ＶＤ−Ｒ１を検出、増幅する。増幅回
路４の出力は電圧／周波数変換回路５に入力され、この
回路５から電流値Ｉに比例した周波数のパルス信号が出
力される。このパルス信号は電気／光変換回路６によっ
て光パルス信号に変換され、この回路６のコネクタ（図
示省略）に接続された光ケーブルを通じて外部回路に光
パルス信号（電流値Ｉの検出信号）が伝送される。(Embodiment) FIG. 1 shows the configuration of a first embodiment of the present invention. Reference numeral 2 denotes a line of the main circuit through which the current to be detected flows, and on the line 2 there is a conductor 1 having a known resistance value R. The amplifier circuit 4 detects and amplifies the voltage drop value VD-R1 of the conductor 1. The output of the amplifier circuit 4 is input to a voltage/frequency conversion circuit 5, which outputs a pulse signal having a frequency proportional to the current value I. This pulse signal is converted into an optical pulse signal by an electrical/optical conversion circuit 6, and the optical pulse signal (detection signal of current value I) is transmitted to an external circuit through an optical cable connected to a connector (not shown) of this circuit 6. Ru.
また、主回路の線路２にはこれに張り付くようにコンデ
ンサＣ７が付設されており、このコンデンサＣ１の大地
側電極と大地間の浮遊容量Ｃ１１が存在する。したがっ
て、線路２の大地電圧を■とすると、コンデンサＣ１に
は、
’Ｊ ｐ −Ｘ Ｖ
Ｃ，＋Ｃ。Further, a capacitor C7 is attached to the line 2 of the main circuit so as to stick thereto, and there is a stray capacitance C11 between the ground side electrode of the capacitor C1 and the ground. Therefore, assuming that the ground voltage of the line 2 is ■, the capacitor C1 has 'J p -X V C, +C.
なる電圧Ｖｐか発生する。電源回路１２はコンデンサ分
圧による前記電圧Ｖｐを入力とし、増幅回路４、電圧／
周波数変換回路５、電気／光変換回路６を駆動する。A voltage Vp is generated. The power supply circuit 12 inputs the voltage Vp obtained by dividing the voltage of the capacitor, and the amplifier circuit 4 and the voltage/voltage
The frequency conversion circuit 5 and the electrical/optical conversion circuit 6 are driven.
以上のように本発明の装置は、主回路の線路に測定回路
の線路を巻き付ける構造の変流器を用いないので、小型
化、軽量化が容易である。例えば第４図に例示するよう
なスイッチギヤに本発明の電流検出装置２７を組み込ん
でも、本体ケース２１を従来よりも小型化することがで
きる。なお第４図において、２２は遮断器、２４はケー
ブル、２５は主回路の導体、２６は母線である。As described above, since the device of the present invention does not use a current transformer having a structure in which the measuring circuit line is wound around the main circuit line, it is easy to reduce the size and weight. For example, even if the current detection device 27 of the present invention is incorporated into a switchgear as illustrated in FIG. 4, the main body case 21 can be made smaller than the conventional case. In FIG. 4, 22 is a circuit breaker, 24 is a cable, 25 is a main circuit conductor, and 26 is a bus bar.
第２図は本発明の第２実施例を示すもので、第１図の実
施例と異なるのは、主回路の線路２と大地間に碍子形コ
ンデンサ分圧器１０の直列コンデンサＣ１と０２を接続
し、
Ｖ ｐ ＝ ｘ Ｖ貼十０２
なる分割電圧Ｖｐを電源回路１２の入力としている点で
ある。この構成は主回路電圧Ｖが比較的低い場合に向い
ている。Fig. 2 shows a second embodiment of the present invention, which differs from the embodiment shown in Fig. 1 in that series capacitors C1 and 02 of an insulator capacitor voltage divider 10 are connected between the main circuit line 2 and the ground. However, the divided voltage Vp of Vp=xVp102 is input to the power supply circuit 12. This configuration is suitable when the main circuit voltage V is relatively low.
第３図は本発明の第３実施例を示すもので、第１図の実
施例における導体１を分流器１に置き換えたもので、他
の構成は同しである。FIG. 3 shows a third embodiment of the present invention, in which the conductor 1 in the embodiment of FIG. 1 is replaced with a shunt 1, and the other configurations are the same.
［発明の効果］
以上詳細に説明したように、この発明によれば変流器を
用いない小型で軽量な電流検出装置を実現することがで
き、スイッチギヤ等の機器に組み込む場合に特に有利で
ある。また、主回路から電源を取り入れて動作するので
別の電源が不用であるとともに、出力を光信号としたの
で電気的には完全に絶縁することができる等の特徴を有
する。[Effects of the Invention] As explained in detail above, according to the present invention, it is possible to realize a small and lightweight current detection device that does not use a current transformer, which is particularly advantageous when incorporated into equipment such as switchgear. be. In addition, since it operates by drawing power from the main circuit, a separate power source is not required, and since the output is an optical signal, it can be completely electrically isolated.
第１図、第２図、第３図は本発明の電流検出装置の第１
実施例、第２実施例、第３実施例の構成図、第４図は本
発明の電流検出装置を組み込んだスイッチギヤの構成図
、第５図は変流器を組み込んだ従来のスイッチギヤの構
成図である。
１・・・導体、２・・・線路、４・・・増幅回路、５・
・・電圧／周波数変換回路、
６・・・電気／光変換回路、７・・・光ケーブル、２３
・・・変流器、
７ ・・
電流検出装置。Figures 1, 2, and 3 show the first diagram of the current detection device of the present invention.
FIG. 4 is a configuration diagram of a switchgear incorporating the current detection device of the present invention, and FIG. 5 is a diagram of a conventional switchgear incorporating a current transformer. FIG. 1... Conductor, 2... Line, 4... Amplifier circuit, 5...
... Voltage/frequency conversion circuit, 6... Electricity/optical conversion circuit, 7... Optical cable, 23
... Current transformer, 7 ... Current detection device.
Claims (1)
の導体の電圧降下値を検出、増幅する増幅回路と、この
増幅回路の出力を光信号に変換する電気／光変換回路と
、前記光信号を外部に出力する光ケーブルコネクタと、
前記検出対象電流が流れる線路と大地間に挿入されたコ
ンデンサから入力電圧を得て前記増幅回路および前記電
気／光変換回路を駆動する電源回路とを備えた電流検出
装置。A conductor with a known resistance value through which a current to be detected flows, an amplifier circuit that detects and amplifies the voltage drop value of this conductor, an electrical/optical conversion circuit that converts the output of this amplifier circuit into an optical signal, and the optical An optical cable connector that outputs the signal to the outside,
A current detection device comprising: a power supply circuit that obtains an input voltage from a capacitor inserted between a line through which the current to be detected flows and the ground, and drives the amplifier circuit and the electric/optical conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2138540A JPH0432778A (en) | 1990-05-30 | 1990-05-30 | Current detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2138540A JPH0432778A (en) | 1990-05-30 | 1990-05-30 | Current detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0432778A true JPH0432778A (en) | 1992-02-04 |
Family
ID=15224545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2138540A Pending JPH0432778A (en) | 1990-05-30 | 1990-05-30 | Current detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0432778A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006098378A (en) * | 2004-09-29 | 2006-04-13 | Seratekku Kk | High precision voltage/current sensor for power transmission and distribution system |
-
1990
- 1990-05-30 JP JP2138540A patent/JPH0432778A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006098378A (en) * | 2004-09-29 | 2006-04-13 | Seratekku Kk | High precision voltage/current sensor for power transmission and distribution system |
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