JPS63163174A - Detection of zero-phase current of pipe type three-phase of cable - Google Patents
Detection of zero-phase current of pipe type three-phase of cableInfo
- Publication number
- JPS63163174A JPS63163174A JP61314516A JP31451686A JPS63163174A JP S63163174 A JPS63163174 A JP S63163174A JP 61314516 A JP61314516 A JP 61314516A JP 31451686 A JP31451686 A JP 31451686A JP S63163174 A JPS63163174 A JP S63163174A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- phase
- cable
- magnetic
- hole
- 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
- 238000001514 detection method Methods 0.000 title claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000000696 magnetic material Substances 0.000 claims abstract description 3
- 230000003287 optical effect Effects 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- -1 for example Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
【発明の詳細な説明】 ケーブル）の零相電流検出方法に係わる。[Detailed description of the invention] related to the zero-sequence current detection method for cables).
口従来技術と問題点コ
三相ＰＯＦケーブルは、鋼管等の内部に３本の絶縁ケー
ブルを配置し、絶縁油を充Ｉｎシたものである。Prior Art and Problems A three-phase POF cable consists of three insulated cables arranged inside a steel pipe or the like and filled with insulating oil.
三相ケーブルで平衡した電流が流れているときは、三相
電流のベルトル和は零となるが、そうでないときは不平
衡電流が生じる。これを検出するためには、各相ケーブ
ルを一括して変流器を結合し、その二次側で零相電流を
求めることができる。When balanced currents are flowing in a three-phase cable, the Bertol sum of the three-phase currents is zero, but when this is not the case, unbalanced currents occur. In order to detect this, each phase cable can be connected to a current transformer, and the zero-sequence current can be determined on the secondary side.
しかし、三相ＰＯＦケーブルにおいては、一般的に云っ
て上述のような変流器を三相ケーブルに結合することは
極めて困難である。However, in three-phase POF cables, it is generally extremely difficult to couple a current transformer as described above to the three-phase cable.
一方、三相ＰＯＦケーブルでは、事故区間検出のため、
零相電流の検出が必要であるが、上述のような理由で、
三相ＰＯＦケーブルにおいて簡ｉｐにこれを求めること
ができない。On the other hand, for three-phase POF cable, in order to detect the accident section,
It is necessary to detect zero-sequence current, but for the reasons mentioned above,
This cannot be easily determined in a three-phase POF cable.
［問題を解決するための手段］
鋼管中に三相ケーブルを配置したＰＯＦケーブルにおい
て、三相ケーブルの通電電流によって発生する磁力線は
、鋼管がＣＴの鉄心の働きをし、その殆んどが鋼管部分
を通る。[Means to solve the problem] In a POF cable in which a three-phase cable is placed inside a steel pipe, the magnetic lines of force generated by the current flowing through the three-phase cable are caused by the steel pipe acting as the core of the CT, and most of them Go through the part.
本発明は、この鋼管を通る磁力線をとらえることによっ
て、零相電流を検出しようとするものであって、鋼管の
一部に非磁性体で構成される部分を設け、磁界センサを
配置し、三相ケーブル通電による零相電流の磁界を検出
し、これによって零相電流を検出するものである。The present invention attempts to detect zero-sequence current by capturing magnetic lines of force passing through this steel pipe. The magnetic field of the zero-sequence current caused by the energization of the phase cable is detected, and the zero-sequence current is thereby detected.
以下図面に示す実施例により本発明を説明する。The present invention will be explained below with reference to embodiments shown in the drawings.
第１図は、三相ＰＯＦケーブルを断面で示している。図
において１は鋼管であり、Ｒ，Ｓ、 Ｔは三相絶縁ケー
ブルを示し、２は充填されている絶縁油を示している。FIG. 1 shows a three-phase POF cable in cross section. In the figure, 1 is a steel pipe, R, S, and T are three-phase insulated cables, and 2 is filled with insulating oil.
鋼管１の長さ方向の一点で鋼管１に孔３があけられ、孔
３に、非磁体、例えばステンレス鋼よりなるフランツ付
のキャップ４を嵌め込み、鋼管１と溶接して内部を密封
し、キャップ４による四部５に、１ｌｉｉ記鋼管１の孔
３の断面とレベルを揃えて磁界センサ６を配置する。A hole 3 is drilled in the steel pipe 1 at one point in the length direction of the steel pipe 1. A cap 4 with a flantz made of a non-magnetic material such as stainless steel is fitted into the hole 3, and the inside is sealed by welding to the steel pipe 1. A magnetic field sensor 6 is arranged in the fourth part 5 according to 1lii, with the same level as the cross section of the hole 3 of the steel pipe 1.
は、ファラデー効果素子と光ファイバ及びＯ／Ｅ。is a Faraday effect element, optical fiber and O/E.
Ｅ１０変喚器等を組合せたものを用いることができる。A combination of E10 converters and the like can be used.
Ｒ，Ｓ、 Ｔによる通電電流によって生じる磁力線は、
鋼管を環状に通るが、前記孔３によるギャップにも通る
から、Ｒ，Ｓ、 Ｔの通電電流が平衡しているときは、
磁力線は生じないが、不平衡の際には磁力線が検出され
る。The lines of magnetic force caused by the current flowing through R, S, and T are:
It passes through the steel pipe in an annular manner, but it also passes through the gap formed by the hole 3, so when the currents flowing through R, S, and T are balanced,
Although no magnetic field lines are generated, magnetic field lines are detected in the event of unbalance.
いつまでもないことであるが、Ｒ，Ｓ、 Ｔの配置によ
っては、平衡している場合でも、磁界センサ７に出力す
る場合があるが、予め設置の時点で補正することができ
る。Although this is a matter of course, depending on the arrangement of R, S, and T, there may be an output to the magnetic field sensor 7 even when they are balanced, but this can be corrected in advance at the time of installation.
［発明の効果コ
以上説明のように、本発明は１個の磁界センサで零相電
流の検出ができる。[Effects of the Invention] As explained above, the present invention can detect zero-sequence current with one magnetic field sensor.
磁界センサの取付けについては、鋼に対するわずかな加
工で済ますことができる。Installation of the magnetic field sensor requires only minor machining of the steel.
の検出ができる。can be detected.
以上のように、従来極めて困難であったＰＯＦ三和ケー
ブルの零相電流が低コストで実現することができる。As described above, the zero-sequence current of the POF Sanwa cable, which has been extremely difficult to achieve in the past, can be realized at low cost.
第１図は本発明の実施例を示す。
ｌ・・・鋼管、２・・・絶縁油、３・・・孔、４・・・
非磁性体キャップ、６・・・磁界センサ。FIG. 1 shows an embodiment of the invention. l... Steel pipe, 2... Insulating oil, 3... Hole, 4...
Non-magnetic cap, 6... Magnetic field sensor.
Claims (1)
非磁性体で構成される部分を設け、該非磁性体部分に光
磁界センサを配置し、前記磁界センサにより磁界を検出
することを特徴とするパイプタイプ型三相ＯＦケーブル
の零相電流検出方法。(1) A part of the steel pipe of the pipe type three-phase OF cable is provided with a part made of a non-magnetic material, an optical magnetic field sensor is arranged in the non-magnetic part, and the magnetic field is detected by the magnetic field sensor. A zero-phase current detection method for a pipe type three-phase OF cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61314516A JPS63163174A (en) | 1986-12-24 | 1986-12-24 | Detection of zero-phase current of pipe type three-phase of cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61314516A JPS63163174A (en) | 1986-12-24 | 1986-12-24 | Detection of zero-phase current of pipe type three-phase of cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63163174A true JPS63163174A (en) | 1988-07-06 |
Family
ID=18054224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61314516A Pending JPS63163174A (en) | 1986-12-24 | 1986-12-24 | Detection of zero-phase current of pipe type three-phase of cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63163174A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004228176A (en) * | 2003-01-21 | 2004-08-12 | Fuji Electric Holdings Co Ltd | Zero-phase current transformer |
| JP2010091550A (en) * | 2003-02-27 | 2010-04-22 | Liaisons Electroniques Mech Lem Sa | Current sensor |
| JP2022021850A (en) * | 2020-07-22 | 2022-02-03 | 株式会社Soken | Current sensor |
-
1986
- 1986-12-24 JP JP61314516A patent/JPS63163174A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004228176A (en) * | 2003-01-21 | 2004-08-12 | Fuji Electric Holdings Co Ltd | Zero-phase current transformer |
| JP2010091550A (en) * | 2003-02-27 | 2010-04-22 | Liaisons Electroniques Mech Lem Sa | Current sensor |
| JP2022021850A (en) * | 2020-07-22 | 2022-02-03 | 株式会社Soken | Current sensor |
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