JPH0524464B2 - - Google Patents
Info
- Publication number
- JPH0524464B2 JPH0524464B2 JP59034902A JP3490284A JPH0524464B2 JP H0524464 B2 JPH0524464 B2 JP H0524464B2 JP 59034902 A JP59034902 A JP 59034902A JP 3490284 A JP3490284 A JP 3490284A JP H0524464 B2 JPH0524464 B2 JP H0524464B2
- Authority
- JP
- Japan
- Prior art keywords
- ground fault
- magnetic core
- fault current
- coil
- magnetic
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、高電圧機器の地絡電流検出装置に関
する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a ground fault current detection device for high voltage equipment.
（発明の技術的背景とその問題点）
高電圧機器、例えば高圧トランス、超高圧ガス
絶縁開閉装置（GIS）、高圧ケーブル線路あるい
はその終端部等において地絡事故が発生した場
合、その機器全体もしくは一部の回路が遮断器に
よつて切離される。(Technical background of the invention and its problems) When a ground fault occurs in high-voltage equipment, such as a high-voltage transformer, an ultra-high-voltage gas insulated switchgear (GIS), a high-voltage cable line, or its terminal, the entire equipment or Some circuits are disconnected by circuit breakers.
そして、地絡事故点を探索して修理等を行なう
が、この地絡電流の波形、方向等は事故の状態を
知る重要な手がかりとなる。この地絡電流の検出
には、第１図に示すような方法が考えられる。 The ground fault point is then searched for and repaired, and the waveform, direction, etc. of this ground fault current provide important clues to the state of the fault. A method as shown in FIG. 1 can be considered for detecting this ground fault current.
即ち、機器の接地をとる接地線１に変流器２を
挿入し、そのコイル３に誘起される電流を観測す
る方法である。 That is, this is a method in which a current transformer 2 is inserted into a grounding wire 1 that grounds equipment, and the current induced in the coil 3 is observed.
ところが、一般に高電圧機器は、平常時誘導に
よる循環電流が接地線に流れており、さらに、回
路のインピーダンスによつて短絡電流にそれぞれ
大きな差がある。短絡電流は大電流であるから、
変流器の磁性コア４が飽和し電流波形を忠実に取
り出すことができない場合も生じる。このため
に、機器ごとに変流器を設計製作する必要があつ
た。これでは煩わしさに耐えない。 However, in general, in high-voltage equipment, a circulating current due to induction flows through the ground wire during normal operation, and furthermore, there is a large difference in short-circuit current depending on the impedance of the circuit. Since the short circuit current is a large current,
There may also be cases where the magnetic core 4 of the current transformer becomes saturated and the current waveform cannot be faithfully extracted. For this reason, it was necessary to design and manufacture a current transformer for each device. I can't stand this hassle.
また、地絡電流を常時監視しようとするシステ
ムにおいては、この検出器の信号を監視所まで導
く必要がある。これには、電気絶縁性の良いノン
メタリツク（金属部品を含まない）光フアイバを
用いた信号の伝送を行なうことが好ましい。 Furthermore, in a system that constantly monitors ground fault current, it is necessary to guide the signal from this detector to a monitoring station. For this purpose, it is preferable to transmit signals using a non-metallic (containing no metal parts) optical fiber with good electrical insulation properties.
しかし、検出器内に光変換のための複雑な回路
を組み込むとその信頼性に欠ける難点がある。 However, incorporating a complex circuit for light conversion into the detector has the drawback of lacking reliability.
（発明の目的）
本発明は以上の点を解決するためになされたも
ので、機器に応じた特性が得られるよう調整の可
能な地絡電流検出装置を提供することを目的とす
るものである。(Object of the Invention) The present invention has been made to solve the above problems, and its purpose is to provide a ground fault current detection device that can be adjusted to obtain characteristics suitable for each device. .
（発明の概要）
本発明は、即ち、接地線の近傍にコイルを配置
して、このコイルを貫通する磁性コアと接地線と
の磁気結合を変更可能にして、機器に応じた磁気
飽和特性が得られるようにした地絡電流検出装置
に関するものである。(Summary of the Invention) That is, the present invention arranges a coil near a grounding wire, and makes it possible to change the magnetic coupling between the magnetic core passing through this coil and the grounding wire, thereby adjusting the magnetic saturation characteristics according to the device. The present invention relates to a ground fault current detection device that can be obtained.
（発明の構成）
以下本発明を図面の実施例に基づいて説明す
る。第２図と第３図は、本発明の原理図である。(Structure of the Invention) The present invention will be described below based on embodiments of the drawings. 2 and 3 are diagrams of the principle of the present invention.
図において、図示しない高電圧機器の接地線１
の近傍には、地絡電流検出用のコイル３が配置さ
れている。接地線１に地絡電流が流れれば接地線
１を軸とする磁界が形成される。コイル３にはこ
の磁界による磁束の磁路を構成する磁性コア５が
挿入されている。軸６を中心にこの磁性コア５を
回転させると、接地線１と磁性コア５との磁気結
合が変化する。これに伴なつて、コイル３に誘起
される誘導電流が変化する。磁性コア５の回転角
を適当に選べば、この誘導電流値の選定が可能で
ある。本発明はこの性質を利用する。 In the figure, grounding wire 1 of high voltage equipment (not shown)
A coil 3 for detecting ground fault current is arranged near. If a ground fault current flows through the ground wire 1, a magnetic field centered around the ground wire 1 is formed. A magnetic core 5 is inserted into the coil 3 and forms a magnetic path for the magnetic flux generated by this magnetic field. When the magnetic core 5 is rotated about the axis 6, the magnetic coupling between the ground wire 1 and the magnetic core 5 changes. Along with this, the induced current induced in the coil 3 changes. This induced current value can be selected by appropriately selecting the rotation angle of the magnetic core 5. The present invention takes advantage of this property.
第４図は本発明の地絡電流検出装置の要部結線
図である。 FIG. 4 is a wiring diagram of main parts of the ground fault current detection device of the present invention.
磁性コア５に巻回されたコイル３には、２本の
互いに逆極性に接続された発光ダイオード７，８
が並列に接続され、かつこの回路に直列に半固定
抵抗９が挿入されている。２本の発光ダイオード
７，８には光フアイバ１０，１１の一端が対向配
置され、その他端は受信器１２に接続されてい
る。受信器１２は、光フアイバ１０，１１から伝
送された光信号を電気信号に変換するＯ／Ｅ変換
器１３と、それらの信号を合成する合成回路１４
と、地絡事故に相当する電流がコイル３に流れた
か否かを判定する判定回路１５を有している。 The coil 3 wound around the magnetic core 5 has two light emitting diodes 7 and 8 connected to each other with opposite polarity.
are connected in parallel, and a semi-fixed resistor 9 is inserted in series in this circuit. One ends of optical fibers 10 and 11 are arranged opposite to the two light emitting diodes 7 and 8, and the other ends are connected to a receiver 12. The receiver 12 includes an O/E converter 13 that converts optical signals transmitted from the optical fibers 10 and 11 into electrical signals, and a synthesis circuit 14 that synthesizes these signals.
It has a determination circuit 15 that determines whether or not a current corresponding to a ground fault has flowed through the coil 3.
第５図は本発明の実施例に係る地絡電流検出装
置の部分切欠斜視図である。第５図に示すよう
に、コイル３を巻回した磁性コア５を収容するケ
ース２１は、円筒状のケース本体２２と、このケ
ース本体２２を回転可能に支持する支持体２３か
ら構成されており、磁性コア５は、ケース本体２
２内に取付支持されている。 FIG. 5 is a partially cutaway perspective view of a ground fault current detection device according to an embodiment of the present invention. As shown in FIG. 5, the case 21 that houses the magnetic core 5 around which the coil 3 is wound is composed of a cylindrical case body 22 and a support body 23 that rotatably supports the case body 22. , the magnetic core 5 is connected to the case body 2
It is mounted and supported within 2.
また、支持体２３の外周部には、４つの取付片
２４，２４，…が設けられており、この取付片２
４，２４，…は、接地線１の挿通溝２７を備えた
固定部材２８にボルト２９，２９，…で固定され
る構成となつている。尚、ケース本体２２の表面
に設けられた目盛３０と支持体２３の表面に設け
られた矢印３１とで、磁性コア５の回転角を知る
ことができる。 Further, four mounting pieces 24, 24, . . . are provided on the outer periphery of the support body 23.
4, 24, . . . are fixed to a fixing member 28 having an insertion groove 27 for the grounding wire 1 with bolts 29, 29, . Note that the rotation angle of the magnetic core 5 can be determined from the scale 30 provided on the surface of the case body 22 and the arrow 31 provided on the surface of the support body 23.
以上の構成の本発明の装置は、次のように作動
する。接地線に地絡電流が流れると、コイル３に
誘導電流が流れる。事故時の地絡電流は5KAか
ら50KA程度流れる。このときのコイル３の誘導
電圧が100V程度になるよう磁性コア５の向きを
調整する。発光ダイオードは数十ミリアンペアで
発光するから、半固定抵抗の抵抗値をこれにあわ
せて調整する。 The apparatus of the present invention having the above configuration operates as follows. When a ground fault current flows through the ground wire, an induced current flows through the coil 3. The ground fault current at the time of an accident flows from about 5KA to 50KA. The orientation of the magnetic core 5 is adjusted so that the induced voltage in the coil 3 at this time is about 100V. Since light emitting diodes emit light at tens of milliamps, the resistance value of the semi-fixed resistor is adjusted accordingly.
地絡事故が生じると、きわめて短時間で保護装
置の遮断器が作動するので、地絡電流の波形を観
測できる時間は非常に短かい。しかもその電流の
方向は一定でない。この間に地絡電流波形を忠実
に監視所に伝送できるよう、交流波形の正極性の
側を一方の発光ダイオードで、負極性の部分を他
方のダイオードでとらえて伝送する。この信号を
一対のＯ／Ｅ変換器１３で電気信号に変換した後
合成回路１４で合成し、もとの地絡波形を再現す
る。判定回路１５では、この地絡波形を分析用と
して記録する一方、例えば両波整流回路で整流し
て平均化する。そして、例えば5KAの地絡電流
検出時の出力に対応する出力以上の電圧が検出さ
れたときアラームを鳴す。 When a ground fault occurs, the circuit breaker of the protection device is activated in a very short time, so the time during which the waveform of the ground fault current can be observed is very short. Moreover, the direction of the current is not constant. During this time, in order to faithfully transmit the ground fault current waveform to the monitoring station, one light-emitting diode captures the positive polarity of the AC waveform, and the other diode captures the negative polarity. This signal is converted into an electric signal by a pair of O/E converters 13, and then synthesized by a synthesis circuit 14 to reproduce the original ground fault waveform. The determination circuit 15 records this ground fault waveform for analysis, and also rectifies and averages it using, for example, a double-wave rectifier circuit. For example, when a voltage higher than the output corresponding to the output at the time of ground fault current detection of 5KA is detected, an alarm is sounded.
第５図に示す地絡電流検出装置において、ケー
ス本体２２を回転させて、コイル３を第２図に示
すような位置にセツトすると、コイル３を貫通す
る磁束が最大となり、また、コイル３を第３図に
示すような位置をセツトすると、コイル３を貫通
する磁束が最小となる。このように、実施例の地
絡電流検出装置では、ケース本体２２を回転させ
ると、磁性コア５と接地線１との磁気結合を変え
ることができ、あらかじめ接地線１に流れる地絡
電流を予測し、この地絡電流によつて磁性コア５
が飽和しないような角度に磁性コア５の角度を設
定する。 In the ground fault current detection device shown in FIG. 5, when the case body 22 is rotated and the coil 3 is set in the position shown in FIG. Setting the position as shown in FIG. 3 will minimize the magnetic flux passing through the coil 3. In this way, in the ground fault current detection device of the embodiment, by rotating the case body 22, the magnetic coupling between the magnetic core 5 and the ground wire 1 can be changed, and the ground fault current flowing through the ground wire 1 can be predicted in advance. However, due to this ground fault current, the magnetic core 5
The angle of the magnetic core 5 is set at such an angle that the magnetic core 5 is not saturated.
上述の本発明の装置は、その実施例に限定され
ない。 The device of the invention described above is not limited to the embodiments thereof.
磁性コアはＵ字型・コ字型・Ｌ字型等各種の形
状をとり得る。 The magnetic core can take various shapes such as U-shape, U-shape, L-shape, etc.
磁性コアと接地線との相対角度を変更する手段
は、磁性コアに軸を設け軸受けで回転支持するよ
うにしてもよい。相対角度の表示手段はこの支持
構造に応じて各種変更が可能である。また磁性コ
アと接地線との間の距離を変更したり、両者の間
に磁気しや閉体を挿入するようにして、磁気結合
を変更するようにしてもよい。 The means for changing the relative angle between the magnetic core and the ground wire may be such that the magnetic core is provided with a shaft and rotatably supported by a bearing. Various changes can be made to the relative angle display means depending on the support structure. Furthermore, the magnetic coupling may be changed by changing the distance between the magnetic core and the ground wire, or by inserting a magnetic shield or closed body between the two.
（発明の効果）
以上説明したように、本発明の地絡電流検出装
置では、磁性コアを回転させることにより、磁気
結合を変えることができるため、機器に応じた地
絡電流の検出設定ができ、地絡電流を忠実に検出
することができる。(Effects of the Invention) As explained above, in the ground fault current detection device of the present invention, magnetic coupling can be changed by rotating the magnetic core, so ground fault current detection settings can be made according to the device. , ground fault current can be detected faithfully.
第１図は接地線の地絡電流を検出する方法の一
例を示す斜視図、第２図と第３図は本発明の装置
の作動原理を説明する斜視図、第４図は本発明の
装置の要部結線図、第５図は本発明の実施例に係
る地絡電流検出装置の部分切欠斜視図である。
１……接地線、３……コイル、５……磁性コ
ア、７，８……発光ダイオード、１０，１１……
光フアイバ、１２……受信器。
FIG. 1 is a perspective view showing an example of a method for detecting a ground fault current in a grounding wire, FIGS. 2 and 3 are perspective views explaining the operating principle of the device of the present invention, and FIG. 4 is a perspective view of the device of the present invention. FIG. 5 is a partially cutaway perspective view of a ground fault current detection device according to an embodiment of the present invention. 1... Ground wire, 3... Coil, 5... Magnetic core, 7, 8... Light emitting diode, 10, 11...
Optical fiber, 12...Receiver.
Claims (1)
このコイルを貫通する磁性コアと前記接地線との
磁気結合を、前記磁性コアの回転により可変とし
たことを特徴とする地絡電流検出装置。1 Place a coil near the grounding wire of high voltage equipment,
A ground fault current detection device characterized in that magnetic coupling between a magnetic core passing through the coil and the ground wire is made variable by rotation of the magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59034902A JPS60178370A (en) | 1984-02-24 | 1984-02-24 | Earth current detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59034902A JPS60178370A (en) | 1984-02-24 | 1984-02-24 | Earth current detection apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60178370A JPS60178370A (en) | 1985-09-12 |
| JPH0524464B2 true JPH0524464B2 (en) | 1993-04-07 |
Family
ID=12427114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59034902A Granted JPS60178370A (en) | 1984-02-24 | 1984-02-24 | Earth current detection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60178370A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007107971A (en) * | 2005-10-12 | 2007-04-26 | Takamisawa Cybernetics Co Ltd | Magnetic sensor device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0120697Y2 (en) * | 1980-10-20 | 1989-06-21 |
-
1984
- 1984-02-24 JP JP59034902A patent/JPS60178370A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60178370A (en) | 1985-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2203833C (en) | A device for sensing of electric discharges in a test object | |
| EP0360592B1 (en) | Apparatus for detecting fault on power transmission lines | |
| WO2000045183A3 (en) | Electrical energy meter | |
| US4940933A (en) | Fiber optic arc monitor | |
| EP0409589B1 (en) | Optical current transformer | |
| JPH0524464B2 (en) | ||
| US4249126A (en) | On-line fault locator for gas-insulated conductors with plural detectors | |
| DE69319192T2 (en) | Fault detection device on an overhead line network for electrical power distribution | |
| US2176756A (en) | Conductor exploring coil | |
| JP2004170172A (en) | Electric field and magnetic field sensor | |
| CN214473576U (en) | All-fiber current transformer capable of adjusting measurement precision | |
| SU1157485A1 (en) | Method of locating sheathing fault in cable lines | |
| JPH0450663A (en) | Current measuring device | |
| JP2003282341A (en) | Zero-phase current detector | |
| SU1532890A2 (en) | Transmitter of electromagnetic field of underground power cable | |
| JPH10170590A (en) | Areal and underground line monitoring device | |
| JPH04295775A (en) | Detecting device for ground current of grounding cable | |
| Ogawa et al. | Field Test of 275 kV Internally Water-Cooled XLPE Cable System With Stainless Steel Coolant Tube and Wire Shield | |
| JPH10160763A (en) | Current measuring structure | |
| MXPA97003265A (en) | A device to detect electric shock in one object of pru | |
| JPH06276671A (en) | Faulty zone locator of transmission line in isolated neutral system | |
| JPH05172854A (en) | Measurement of electric current by photomagnetic field sensor | |
| JPS5937812A (en) | Ground-fault point detector in gas insulated electric device | |
| JPS5366584A (en) | Searching method for direction of cable fault | |
| JPS6472081A (en) | Electroscope |