JPS6351010A - Insulator for current detection - Google Patents
Insulator for current detectionInfo
- Publication number
- JPS6351010A JPS6351010A JP61194945A JP19494586A JPS6351010A JP S6351010 A JPS6351010 A JP S6351010A JP 61194945 A JP61194945 A JP 61194945A JP 19494586 A JP19494586 A JP 19494586A JP S6351010 A JPS6351010 A JP S6351010A
- Authority
- JP
- Japan
- Prior art keywords
- current
- insulator
- optical fiber
- current detection
- electric wire
- 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
- 239000012212 insulator Substances 0.000 title claims description 20
- 238000001514 detection method Methods 0.000 title claims description 14
- 239000013307 optical fiber Substances 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000004804 winding Methods 0.000 description 14
- 230000003287 optical effect Effects 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005697 Pockels effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Insulators (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
発明の目的
(産業上の利用分野)
この発明は電線路の電流を々11定するために用いる電
流検出用碍子に関するものである。DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) This invention relates to a current detection insulator used for regulating the current in an electric line.
(従来の技術)
従来、電線路における電力供給のための情報収集の一つ
である電流の測定は、第3図(a)及び(b)に示すよ
うに、電線5に近接させて磁界センサ41を配置し、こ
の磁界センサ41によって電線路の電流による磁界(鎖
線で示す)を検出し、計測器を介して直接に電流値を測
定する手段が採用されている。(Prior Art) Conventionally, current measurement, which is one of the information gathering methods for power supply on electric lines, has been carried out using a magnetic field sensor placed close to the electric wire 5, as shown in FIGS. 3(a) and 3(b). 41 is arranged, the magnetic field sensor 41 detects the magnetic field (shown by the chain line) due to the current in the electric line, and the current value is directly measured via a measuring device.
(発明が解決しようとする問題点)
ところが、前記従来の電流検出装置は、直接に電線路の
磁界を検出して電流を測定しているので、三相電線路な
どにおいては測定する相の61界が他相の磁界の干渉を
受けて変り1し易いために側定悄度が低下し、又、磁界
センサ41は、その測定能力の制約上、一定の電流領域
しか測定できないなどの欠点があり、電線路における事
故電流など広領域の測定には支障があり、これをカバー
するためには、電流領域別の各種センサの設置が必要に
なるなどの問題点があった。(Problem to be Solved by the Invention) However, since the conventional current detection device directly detects the magnetic field of the electric line and measures the current, in a three-phase electric line, etc., the 61st current of the phase to be measured is The field tends to change due to the interference of magnetic fields of other phases, resulting in a decrease in lateral oscillation, and the magnetic field sensor 41 has drawbacks such as being able to measure only a certain current range due to its measurement capability. This poses a problem in measuring wide areas such as fault currents in power lines, and to cover this problem, it is necessary to install various sensors for each current area.
発明の構成
(問題点を解決するための手段)
この発明は前記問題点を解決するため、碍子本体に対し
測定器に接続される光ファイバを挿通するとともに、同
碍子本体の上部に対し、同碍子本体に支持した電線を囲
繞するように変流器を装着し、前記光ファイバの先端部
と前記変流器の鉄心に巻回した巻線との間に、前記電線
に流れる電流に比例した電流の変化を光の強度変化に変
換するための二次i担抵抗と電圧センサ又は電流センサ
を接続するという手段を採用している。Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has an optical fiber that is connected to a measuring instrument inserted into the insulator body, and a similar A current transformer is attached to surround the electric wire supported on the insulator body, and a current proportional to the electric current flowing through the electric wire is installed between the tip of the optical fiber and the winding wound around the iron core of the current transformer. A method is adopted in which a secondary i-carrying resistor and a voltage sensor or a current sensor are connected to convert a change in current into a change in light intensity.
(作用)
この発明は前記手段を採ったことにより、電線路の電流
により変流器の鉄心に磁界が生じ、この磁界の大きさに
比例して巻線に二次電流が発生し、このときの二次電流
が二次負担抵抗と電圧センサ又は電流センサに印加され
、同電圧センサ又は電流センサから前記電線に生じた電
流の大きさに応じて変調された光が光ファイバを通じて
測定器に伝送される。この際、磁界は測定する相の電線
を囲繞する鉄心に収束され、かつ他相の磁界の干渉を遮
蔽するので、巻線には電線路の一次電流に比例した正確
な二次電流を誘起させる。又、前記巻線に接続した二次
負担抵抗はその抵抗値を増減調整することにより、広領
域の電流を所定範囲の電圧に変換できるので、広領域電
流の検出を高精度に維持できる。前記変調光は測定器で
電気信号に変換することにより電線の電流が測定される
。(Function) By adopting the above-mentioned means, this invention generates a magnetic field in the iron core of the current transformer due to the current in the electric line, and a secondary current is generated in the winding in proportion to the magnitude of this magnetic field. A secondary current is applied to the secondary load resistor and the voltage sensor or current sensor, and light modulated according to the magnitude of the current generated in the electric wire from the voltage sensor or current sensor is transmitted to the measuring instrument through the optical fiber. be done. At this time, the magnetic field is focused on the iron core surrounding the wire of the phase to be measured, and the interference of magnetic fields of other phases is shielded, so that an accurate secondary current proportional to the primary current of the wire is induced in the winding. . Further, by increasing or decreasing the resistance value of the secondary load resistor connected to the winding, it is possible to convert a current in a wide range into a voltage in a predetermined range, so that detection of a current in a wide range can be maintained with high accuracy. The modulated light is converted into an electrical signal by a measuring device, thereby measuring the current in the wire.
(実施例)
以下、この発明を具体化した一実施例を第1図及び第2
図に基づいて説明すると、磁2:(製の碍子本体1の下
端部にはベース金具2がセメント3により嵌合固定され
、上端部にはキャンプ金具4がセメント3により一体に
嵌合固定されている。前記キャップ金具4の上面に形成
し嵌合凹部4aには、電線5を挟着するクランプ部材と
しての機能を兼用した分割型の変流器6が装着されてい
る。(Example) An example embodying this invention will be described below with reference to FIGS. 1 and 2.
To explain based on the diagram, a base metal fitting 2 is fitted and fixed to the lower end of an insulator body 1 made of magnet 2: A split-type current transformer 6, which also functions as a clamp member for clamping the electric wire 5, is mounted in the fitting recess 4a formed on the upper surface of the cap fitting 4.
この変流器6は前記キャップ金具4の嵌合凹部4aに螺
合あるいは接着材により固定されたゴム、樹脂等の絶縁
材よりなる下部クランプ部材7と、同下部クランプ部材
7の上面に接合され、ポルト8により締付固定された上
部クランプ部材9と、前記両クランプ部材7.9に前記
電線5を囲繞するように埋設された一対の鉄心10.1
1と、下部の鉄心10に巻回された巻線12とにより構
成されている。This current transformer 6 includes a lower clamp member 7 made of an insulating material such as rubber or resin, which is screwed into the fitting recess 4a of the cap fitting 4 or fixed with an adhesive, and is joined to the upper surface of the lower clamp member 7. , an upper clamp member 9 tightened and fixed by a port 8, and a pair of iron cores 10.1 embedded in both clamp members 7.9 so as to surround the electric wire 5.
1 and a winding 12 wound around a lower iron core 10.
前記下部クランプ部材7の下部内側には、前記巻線12
の両端部に接続され、かつ同巻線12に誘起された二次
電流を電圧に変換するための二次負担抵抗13と、同じ
く前記巻線12の両端部に直列に接続され、かつ同巻線
12に印加さた電圧変化を光の強弱に変換するための電
圧センサ14が埋設固定されている。この電圧センサ1
4を第1図により説明すると、絶縁ケース15内にポッ
ケルス素子よりなる電気光学素子16を配し、その上面
に〃波長板17及び反射鏡18を、下面にはロンドレン
ズ19をそれぞれ接着固定し、さらにロンドレンズ19
には偏光子20を接着している。又、この偏光子20に
は光伝送路となる透光体として高絶縁性と無誘導性とを
有する入射光用及び出射光用の光ファイバ21が接続さ
れ、絶縁ケース15から導出されている。前記電気光学
素子16には内部電極22a、22bが接着固定され、
同内部電極22a、22bに前記巻線12の両端が接続
されている。The winding 12 is disposed inside the lower part of the lower clamp member 7.
A secondary burden resistor 13 connected to both ends of the winding 12 and for converting the secondary current induced in the winding 12 into voltage; A voltage sensor 14 is embedded and fixed for converting changes in voltage applied to the line 12 into intensity of light. This voltage sensor 1
4 will be explained with reference to FIG. 1. An electro-optical element 16 made of a Pockels element is placed inside an insulating case 15, and a wave plate 17 and a reflecting mirror 18 are adhesively fixed to its upper surface, and a Rondo lens 19 is adhesively fixed to its lower surface. , and more Rondo Lens 19
A polarizer 20 is adhered to. Further, optical fibers 21 for incident light and emitted light having high insulation properties and non-inductive properties are connected to this polarizer 20 as a transparent body serving as an optical transmission path, and are led out from the insulating case 15. . Internal electrodes 22a and 22b are adhesively fixed to the electro-optical element 16,
Both ends of the winding 12 are connected to the internal electrodes 22a and 22b.
光ファイバ21は偏光子20、及び絶縁ケース15に対
し固定材23.24により固着され、又、絶縁ケース1
5内の空隙部には絶縁物25が充填されている。The optical fiber 21 is fixed to the polarizer 20 and the insulating case 15 by fixing members 23 and 24, and the insulating case 1
The void within 5 is filled with an insulator 25 .
一方、透光体である前記光ファイバ21は前記碍子本体
1の中心部に貫通形成した挿通孔1aに挿入され、その
下端はベース金具2の中央部に取り付けた光コネクタ2
6に接続されている。なお、透光体は、光ファイバ21
のほか、外周にP V Cシースなどを被覆した光フア
イバケーブル(図示略)を使用してもよく、さらに、光
ファイバや光フアイバケーブルに代えて、碍子本体1の
軸心に設けた透光性セラミックス(図示略)などの端部
に、前記偏光子20や光コネクタ26を接合してもよい
、前記光コネクタ26には光フアイバケーブル27が接
続され、その基端は電柱等に設置した測定器32の光分
岐器28を介して例えば、発光ダイオードよりなる光源
29及びホトダイオードよりなる受光器30に接続され
、同受光器30は演算制御装置31に接続されている。On the other hand, the optical fiber 21, which is a transparent body, is inserted into the insertion hole 1a formed through the center of the insulator body 1, and its lower end is connected to the optical connector 2 attached to the center of the base metal fitting 2.
6. Note that the transparent body is the optical fiber 21
In addition, an optical fiber cable (not shown) whose outer periphery is coated with a PVC sheath or the like may also be used. The polarizer 20 or the optical connector 26 may be bonded to the end of a magnetic ceramic (not shown), etc. An optical fiber cable 27 is connected to the optical connector 26, and the base end thereof is installed on a utility pole or the like. The measuring device 32 is connected to a light source 29 made of a light emitting diode and a photodetector 30 made of a photodiode, for example, through an optical branching device 28 , and the photodetector 30 is connected to an arithmetic and control unit 31 .
なお、前記キャップ金具4には変流器6を覆うカバー3
3が装着されている。Note that the cap fitting 4 is provided with a cover 3 that covers the current transformer 6.
3 is installed.
次に、前記のように構成した電流検出碍子の作用を説明
する。Next, the operation of the current detection insulator constructed as described above will be explained.
今、電線5に電流が流れると、鉄心10.11には磁界
が生じ、同磁界により巻線12に磁界の大きさに比例し
た二次電流が誘起され、この電流が二次負担抵抗13に
より電圧に変換され、同電圧が電圧センサ14の電気光
学素子16に印加される。Now, when a current flows through the electric wire 5, a magnetic field is generated in the iron core 10, 11, a secondary current proportional to the magnitude of the magnetic field is induced in the winding 12 by the magnetic field, and this current is caused by the secondary burden resistance 13. The voltage is converted into a voltage, and the same voltage is applied to the electro-optic element 16 of the voltage sensor 14.
又、本発明では、二次負担抵抗13を巻線12に接続し
ており、巻線12に誘起する二次電流の大きさによって
その抵抗値を適宜に増減調整すれば、電線路における広
領域の電流を一定範囲内の電圧値に選定的に変換できる
ので、電流領域別のセンサを用いることなく、共通の電
圧センサを通用することができる。なお、二次負担抵抗
13は適用電流によって予め抵抗値を設定して、碍子に
組付けてもよいが、外部から調節可能な可変式にしてお
けば、汎用性が高くなる。Further, in the present invention, the secondary burden resistor 13 is connected to the winding 12, and if the resistance value is adjusted to increase or decrease as appropriate depending on the magnitude of the secondary current induced in the winding 12, it can be applied over a wide area in the electric line. Since the current can be selectively converted to a voltage value within a certain range, a common voltage sensor can be used without using sensors for each current range. Note that the resistance value of the secondary load resistor 13 may be set in advance according to the applied current and then assembled to the insulator, but if it is of a variable type that can be adjusted from the outside, versatility will be increased.
一方、前記光源29から光ファイハゲープル27を通り
、光コネクタ26を介して碍子本体1内の光伝送路であ
る光ファイバ21に光が伝送され、さらに、電圧センサ
14内を通過する間に電気光学素子16のポッケルス効
果により開光は111■記電圧、つまり電線5の電流に
応じて位相変調を受け、偏光子20及びA波長板17に
より強度変調されて光の強弱信号となり、この被変調光
信号は光ファイバ21によって外部からの7f! [j
A導を受けることなく伝送され、光コネクタ26を介し
て測定器32の受光器30に導かれ、その後電気信号と
なって電線5に生じた電流が測定される。On the other hand, light is transmitted from the light source 29 to the optical fiber 21 which is an optical transmission path inside the insulator body 1 through the optical fiber cable 27 via the optical connector 26, and further while passing through the voltage sensor 14. Due to the Pockels effect of the electro-optical element 16, the open light undergoes phase modulation according to the voltage described in 111, that is, the current of the electric wire 5, and is intensity-modulated by the polarizer 20 and the A-wave plate 17 to become a light intensity signal. The optical signal is transmitted from the outside via an optical fiber 21 at 7f! [j
It is transmitted without receiving the A conductor, is guided to the light receiver 30 of the measuring device 32 via the optical connector 26, and then becomes an electric signal and the current generated in the electric wire 5 is measured.
ところで、この実施例では電圧センサ14の電気光学素
子16として、例えば−20℃〜100℃の温度範囲で
、電流の検出誤差が±1%と低い。Incidentally, in this embodiment, the electro-optical element 16 of the voltage sensor 14 has a current detection error as low as ±1% in a temperature range of -20°C to 100°C, for example.
つまり温度特性が良好な、しかも耐候性に冨むポッケル
ス素子を使用することにより、又、測定回路に二次負担
抵抗13を接続することにより、従来のものと比較して
電流の検1■口n度が向上し信頼性が高まる。又、前記
電気光学素子16、光ファイバ21及び光フアイバケー
ブル27はともに絶縁物性、及び無誘導性であり、又、
磁器製の碍子本体1の頭部に電線支持機能を備えた電流
検出部を設けているので、構造も簡単で、又、取扱いや
取付けも容易であり、周囲条件による影響も排除して、
精度の高い測定ができ、安全性に優れている。In other words, by using a Pockels element with good temperature characteristics and high weather resistance, and by connecting a secondary burden resistor 13 to the measurement circuit, it is possible to measure the current with one opening compared to the conventional one. The n degree is improved and the reliability is increased. Further, the electro-optical element 16, the optical fiber 21 and the optical fiber cable 27 are all insulative and non-inductive, and
Since a current detection part with a wire support function is provided on the head of the insulator body 1 made of porcelain, the structure is simple, and it is easy to handle and install, eliminating the influence of surrounding conditions.
It allows for highly accurate measurements and is highly safe.
なお、本発明は前記各実施例に限定されるものではなく
、次のように具体化することもできる。It should be noted that the present invention is not limited to the above-mentioned embodiments, but can also be embodied as follows.
(1)前記実施例では巻線12の両端に発生する電圧変
化を光の強弱に変化するようにしたが、巻線12に対し
、電流変化を光の強弱に変化する電流センサとしての発
光ダイオードを接続するとともに、同発光ダイオードに
は光ファイバを接続すること。(1) In the above embodiment, the voltage change generated at both ends of the winding 12 is changed to the intensity of light, but a light emitting diode is used as a current sensor for the winding 12 to change the current change to the intensity of light. At the same time, connect an optical fiber to the light emitting diode.
(2)図示しないが前記二次負trI抵抗13と並列に
、アレスターを接続して、過電圧保護を行うようにする
こと。(2) Although not shown, an arrester is connected in parallel with the secondary negative trI resistor 13 to provide overvoltage protection.
(3)図示しないが二次負担抵抗13と直列、又は並列
にサーミスタを接続して温度補償し、温度特性をさらに
向上するようにすること。(3) Although not shown, a thermistor may be connected in series or in parallel with the secondary burden resistor 13 to compensate for the temperature and further improve the temperature characteristics.
発明の効果
以上詳述したように、本発明は電線の支持碍子に電流検
出部を一体化して設置スペースを小さくできるとともに
、構造が簡単で、又、製作及び取付けを容易に行え、さ
らに、安全に精度の高い電流測定が実現できる優れた効
果がある。Effects of the Invention As detailed above, the present invention integrates the current detection section into the support insulator of the electric wire to reduce the installation space, has a simple structure, is easy to manufacture and install, and is also safe. This has the excellent effect of realizing highly accurate current measurement.
第1図は本発明の一実施例を示す要部の断面図、第2図
は電流検出用碍子全体を示す中央部半紺断面図、第3図
(a)は従来の電流検出装置を示すネ4視図、第3図(
b)は同じ〈従来の電流検出装置を示す正面図である。
1・・・碍子本体、5・・・電線、6・・・変流器、7
・・・下部クランプ部材、9・・・上部クランプ部材、
10゜11・・・鉄心、12・・・コイル、13・・・
二次質1抵抗、14・・・電圧センサ、16・・・電気
光学素子、21・・・光ファイバ、26・・・光コネク
タ、27・・・光フアイバケーブル、32・・・測定器
。
特許出願人 中部電力 株式会社日本碍子 株式
会社
株式会社 高松電気製作所Fig. 1 is a sectional view of the main part showing an embodiment of the present invention, Fig. 2 is a semi-dark sectional view of the central part showing the entire current detection insulator, and Fig. 3(a) shows a conventional current detection device. Figure 4, Figure 3 (
b) is a front view showing the same conventional current detection device. 1... Insulator body, 5... Electric wire, 6... Current transformer, 7
... lower clamp member, 9 ... upper clamp member,
10゜11... Iron core, 12... Coil, 13...
Secondary material 1 resistance, 14... voltage sensor, 16... electro-optical element, 21... optical fiber, 26... optical connector, 27... optical fiber cable, 32... measuring instrument. Patent applicant Chubu Electric Power Co., Ltd. Nippon Insulators Co., Ltd. Takamatsu Electric Manufacturing Co., Ltd.
Claims (1)
光ファイバ(21)を挿通するとともに、同碍子本体(
1)の上部に対し、同碍子本体(1)に支持した電線(
5)を囲繞するように変流器(6)を装着し、前記光フ
ァイバ(21)の先端部と前記変流器(6)の鉄心(1
0、11)に巻回した巻線(12)との間に、前記電線
(5)に流れる電流に比例した電流の変化を光の強度変
化に変換するための二次負担抵抗(13)と電圧センサ
(14)又は電流センサを接続したことを特徴とする電
流検出用碍子。 2、前記電圧センサ(14)を構成する電気光学素子(
16)はポッケルス素子である特許請求の範囲第1項記
載の電流検出用碍子。 3、前記電流センサは発光ダイオードにより構成されて
いる特許請求の範囲第1項記載の電流検出用碍子。[Claims] 1. An optical fiber (21) connected to a measuring device (32) is inserted into the insulator body (1), and the same is inserted into the insulator body (1).
1), the electric wire (1) supported on the insulator body (1)
A current transformer (6) is attached so as to surround the optical fiber (21) and the iron core (1) of the current transformer (6) is connected to the tip of the optical fiber (21).
0, 11) and a secondary burden resistor (13) for converting a change in current proportional to the current flowing through the electric wire (5) into a change in light intensity. A current detection insulator characterized in that a voltage sensor (14) or a current sensor is connected. 2. An electro-optical element (
The current detection insulator according to claim 1, wherein 16) is a Pockels element. 3. The current detection insulator according to claim 1, wherein the current sensor is constituted by a light emitting diode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61194945A JPH0664952B2 (en) | 1986-08-20 | 1986-08-20 | Insulator for current detection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61194945A JPH0664952B2 (en) | 1986-08-20 | 1986-08-20 | Insulator for current detection |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6351010A true JPS6351010A (en) | 1988-03-04 |
JPH0664952B2 JPH0664952B2 (en) | 1994-08-22 |
Family
ID=16332943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61194945A Expired - Lifetime JPH0664952B2 (en) | 1986-08-20 | 1986-08-20 | Insulator for current detection |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0664952B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0270211A (en) * | 1988-08-31 | 1990-03-09 | Ngk Insulators Ltd | Optical signal type monitor for electric line and connector therefor |
JPH02265117A (en) * | 1988-12-28 | 1990-10-29 | Ngk Insulators Ltd | Support insulator with optical ct |
CN102384996A (en) * | 2011-10-13 | 2012-03-21 | 南京苏特电气股份有限公司 | Power transformer with high-voltage side power collecting signals |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62278465A (en) * | 1986-05-27 | 1987-12-03 | Ngk Insulators Ltd | Lightening arresting insulator with actuation sensor |
-
1986
- 1986-08-20 JP JP61194945A patent/JPH0664952B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62278465A (en) * | 1986-05-27 | 1987-12-03 | Ngk Insulators Ltd | Lightening arresting insulator with actuation sensor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0270211A (en) * | 1988-08-31 | 1990-03-09 | Ngk Insulators Ltd | Optical signal type monitor for electric line and connector therefor |
JPH02265117A (en) * | 1988-12-28 | 1990-10-29 | Ngk Insulators Ltd | Support insulator with optical ct |
CN102384996A (en) * | 2011-10-13 | 2012-03-21 | 南京苏特电气股份有限公司 | Power transformer with high-voltage side power collecting signals |
Also Published As
Publication number | Publication date |
---|---|
JPH0664952B2 (en) | 1994-08-22 |
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