JPH0980109A - Apparatus for monitoring leak current of arrester - Google Patents
Apparatus for monitoring leak current of arresterInfo
- Publication number
- JPH0980109A JPH0980109A JP7237026A JP23702695A JPH0980109A JP H0980109 A JPH0980109 A JP H0980109A JP 7237026 A JP7237026 A JP 7237026A JP 23702695 A JP23702695 A JP 23702695A JP H0980109 A JPH0980109 A JP H0980109A
- Authority
- JP
- Japan
- Prior art keywords
- leakage current
- lightning arrester
- pointer
- monitoring device
- current monitoring
- 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
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、交流成分を含む
直流電圧が印加される避雷器の漏れ電流を検出する避雷
器の漏れ電流監視装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrester leakage current monitoring device for detecting a leakage current of an arrester to which a DC voltage containing an AC component is applied.
【０００２】[0002]
【従来の技術】近年、長距離・大容量電力送電として直
流送電の開発が進められている。図１５は交直変換所の
一般的な電気回路の構成図である。図１５において、交
流系統１に接続した変換用変圧器２からバルブ３ａで構
成した高圧側ブリッジ３とバルブ４ａで構成した低圧側
ブリッジ４とで高電圧の直流に変換し、直流本線５及び
中性線６から出力する。そして、酸化亜鉛素子で構成し
た避雷器３ｂ、４ｂを各バルブ３ａ、４ａに並列接続す
る。このうち、高圧側のバルブ３ａ及び避雷器３ｂは大
地からの電位が高く空間的にも高い位置に絶縁して設置
される。さらに、電流計３ｃ、４ｃは各避雷器３ｂ、４
ｂと直列に接続して、避雷器３ｂ、４ｂの漏れ電流を検
出する。なお、７は中性線用避雷器、８は３相ブリッジ
用避雷器及び９は６相ブリッジ用避雷器である。2. Description of the Related Art In recent years, direct current power transmission has been developed as long-distance, large-capacity power transmission. FIG. 15 is a configuration diagram of a general electric circuit of an AC / DC converter. In FIG. 15, from the conversion transformer 2 connected to the AC system 1, the high voltage side bridge 3 composed of the valve 3a and the low voltage side bridge 4 composed of the valve 4a convert into high voltage DC, and the DC main line 5 and the middle Output from sex line 6. Then, the lightning arresters 3b, 4b composed of zinc oxide elements are connected in parallel to the valves 3a, 4a. Among these, the high-voltage side valve 3a and the lightning arrester 3b are installed insulated at positions where the potential from the ground is high and the space is also high. Further, the ammeters 3c and 4c are the lightning arresters 3b and 4c.
It is connected in series with b to detect the leakage current of the lightning arresters 3b, 4b. In addition, 7 is a neutral line arrester, 8 is a three-phase bridge arrester, and 9 is a 6-phase bridge arrester.
【０００３】[0003]
【発明が解決しようとする課題】一般に避雷器の耐雷素
子として使用されている酸化亜鉛素子の等価回路は図１
６のように、電圧依存性を有する非直線抵抗１０と容量
１１との並列回路として表される。そして、酸化亜鉛素
子の劣化は、一定の条件での抵抗分の漏れ電流ｉRの増
大として表れる。この場合、酸化亜鉛素子の劣化検出に
は容量分の電流ｉCは無関係であるが、電流計３ｃ、４
ｃには容量分の電流ｉCを含んだ漏れ電流ｉT＝ｉR＋ｉC
が流れるので、劣化の検出精度を向上させることが困難
であるという問題点があった。An equivalent circuit of a zinc oxide element generally used as a lightning protection element of a lightning arrester is shown in FIG.
6 is represented as a parallel circuit of a non-linear resistance 10 having a voltage dependency and a capacitor 11. Then, the deterioration of the zinc oxide element appears as an increase in the leakage current i R of the resistance component under certain conditions. In this case, although the current i C for the capacitance is irrelevant for detecting the deterioration of the zinc oxide element, the ammeters 3c, 4
c is the leakage current i T = i R + i C including the current i C for the capacitance
Therefore, there is a problem that it is difficult to improve the detection accuracy of deterioration.
【０００４】また、高圧側ブリッジ３は大地から高い位
置に絶縁されているので、地上側から電流計の指示を確
認することが困難であるという問題点があった。Further, since the high voltage side bridge 3 is insulated at a high position from the ground, it is difficult to confirm the ammeter indication from the ground side.
【０００５】[0005]
【課題を解決するための手段】請求項１の発明に係る避
雷器の漏れ電流監視装置は、交流成分を含んだ直流電圧
が印加される避雷器の漏れ電流を検出する避雷器の漏れ
電流監視装置において、避雷器に抵抗と電流計とを直列
接続して、抵抗と電流計との直列回路にコンデンサを並
列接続し、抵抗とコンデンサとの時定数を商用周波数の
１サイクル時間より大きくしたものである。According to a first aspect of the present invention, there is provided a lightning arrester leakage current monitoring device for detecting a leakage current of an arrester to which a DC voltage including an AC component is applied. A resistance and an ammeter are connected in series to a lightning arrester, a capacitor is connected in parallel to a series circuit of the resistance and an ammeter, and a time constant between the resistance and the capacitor is made larger than one cycle time of a commercial frequency.
【０００６】請求項２の発明に係る避雷器の漏れ電流監
視装置は、請求項１に記載の避雷器の漏れ電流監視装置
において、電流計を可動指針形として指針を発光手段と
伝送手段との間に配置し、指針の振れ角度に応じて指針
が発光手段からの光を遮光し、伝送手段により伝送され
た光信号を受光手段で電気信号に変換して、電気信号を
演算手段で演算して避雷器の漏れ電流を検出するように
構成したものである。A leakage current monitoring device for a lightning arrester according to a second aspect of the present invention is the leakage current monitoring device for a lightning arrester according to the first aspect, wherein the ammeter is a movable pointer type and the pointer is provided between the light emitting means and the transmitting means. Arranged, the pointer shields the light from the light emitting means according to the deflection angle of the pointer, the light signal transmitted by the transmitting means is converted into an electric signal by the light receiving means, and the electric signal is calculated by the calculating means and the lightning arrester It is configured to detect the leakage current of.
【０００７】請求項３の発明に係る避雷器の漏れ電流監
視装置は、請求項２に記載の避雷器の漏れ電流監視装置
において、電流計の指針と伝送手段との間に集光用のレ
ンズを配置したものである。A lightning arrester leakage current monitoring device according to a third aspect of the present invention is the lightning arrester leakage current monitoring device according to the second aspect, wherein a condenser lens is arranged between the pointer of the ammeter and the transmission means. It was done.
【０００８】請求項４の発明に係る避雷器の漏れ電流監
視装置は、請求項１に記載の避雷器の漏れ電流監視装置
において、発光手段が出力した光を第１の伝送手段で伝
送し、第１の伝送手段と所定の間隔をあけて第２の伝送
手段を対向させ、電流計を可動指針形として指針を両伝
送手段間に配置し、指針の振れ角度に応じて第２の伝送
手段へ入射する光を遮光し、第２の伝送手段を介して伝
送された光信号を受光手段で電気信号に変換して、電気
信号を演算手段で演算して避雷器の漏れ電流を検出する
ように構成したものである。A lightning arrester leakage current monitoring device according to a fourth aspect of the present invention is the lightning arrester leakage current monitoring device according to the first aspect, wherein the light output from the light emitting means is transmitted by the first transmission means. The second transmission means is opposed to the second transmission means at a predetermined interval, the ammeter is a movable pointer type, and the pointer is disposed between both the transmission means, and the second transmission means is incident according to the deflection angle of the pointer. The light receiving device is configured to block the light to be transmitted, convert the optical signal transmitted through the second transmission means into an electric signal by the light receiving means, and calculate the electric signal by the arithmetic means to detect the leakage current of the lightning arrester. It is a thing.
【０００９】請求項５の発明に係る避雷器の漏れ電流監
視装置は、請求項４に記載の避雷器の漏れ電流監視装置
において、第２の伝送手段を複数個とし、電流計の指針
が第２の伝送手段へ入射する光を順次遮光するようにし
たものである。A lightning arrester leakage current monitoring device according to a fifth aspect of the present invention is the lightning arrester leakage current monitoring device according to the fourth aspect, wherein a plurality of second transmission means are provided and the ammeter pointer is second. The light incident on the transmission means is sequentially blocked.
【００１０】請求項６の発明に係る避雷器の漏れ電流監
視装置は、請求項５に記載の避雷器の漏れ電流監視装置
において、電流計の指針の第１の振れ角度で第２の伝送
手段の第１番目を遮光し、第１の振れ角度より大きい第
２の振れ角度で第１番目の第２の伝送手段の遮光を解除
して、第２の伝送手段の第２番目を遮光するものであ
る。A lightning arrester leakage current monitoring device according to a sixth aspect of the present invention is the lightning arrester leakage current monitoring device according to the fifth aspect, wherein the ammeter pointer has a first deflection angle and a second transmission means has a second deflection angle. The first light is shielded, the second transmission means, which is the first deflection means, is unshielded at a second deflection angle larger than the first deflection angle, and the second transmission means is shielded. .
【００１１】請求項７の発明に係る避雷器の漏れ電流監
視装置は、請求項２から請求項６のいずれかに記載の避
雷器の漏れ電流監視装置において、発光手段、受光手段
及び演算手段を大地電位部に配置したものである。A leakage current monitoring device for a lightning arrester according to a seventh aspect of the present invention is the leakage current monitoring device for a lightning arrester according to any one of the second to sixth aspects, in which the light emitting means, the light receiving means and the computing means are grounded. It is arranged in the section.
【００１２】[0012]
実施の形態１．図１は実施の形態１の構成図である。図
１において、１２は通流制御されるサイリスタで、交流
成分を含んだ直流電圧を出力する。１３は一端をサイリ
スタ１２のカソードＫ側に接続した避雷器で、酸化亜鉛
素子で構成している。１４は一端を避雷器１３の他端に
接続した抵抗、１５は一端を抵抗１４の他端に接続した
可動コイル形の電流計で、他端をサイリスタ１２のアノ
ードＡ側に接続してある。１６は抵抗１４と電流計１６
との直列回路に並列接続したコンデンサである。なお、
抵抗１４とコンデンサ１６とから決まる時定数は、商用
周波数の１サイクル時間より大きくなるように設定して
ある。即ち、商用周波数が６０Ｈｚの場合は、時定数τ
eを１６．６７ｍｓｅｃより大きく設定する。さらに、
電流計１６の機械的な時定数τmも時定数τeと同様に１
６．６７ｍｓｅｃ以上のものを採用する。Embodiment 1. FIG. 1 is a configuration diagram of the first embodiment. In FIG. 1, reference numeral 12 is a thyristor controlled to flow, and outputs a DC voltage containing an AC component. Reference numeral 13 is a lightning arrester having one end connected to the cathode K side of the thyristor 12, and is composed of a zinc oxide element. Reference numeral 14 is a resistor having one end connected to the other end of the lightning arrester 13, and 15 is a moving coil type ammeter having one end connected to the other end of the resistor 14, the other end of which is connected to the anode A side of the thyristor 12. 16 is a resistor 14 and an ammeter 16
Is a capacitor connected in parallel to the series circuit of. In addition,
The time constant determined by the resistor 14 and the capacitor 16 is set to be longer than one cycle time of the commercial frequency. That is, when the commercial frequency is 60 Hz, the time constant τ
Set e to be larger than 16.67 msec. further,
The mechanical time constant τ m of the ammeter 16 is 1 as well as the time constant τ e.
Use a speed of 6.67 msec or more.
【００１３】なお、時定数τe、τmを１６．６７ｍｓｅ
ｃ以上に設定したのは次の理由による。即ち、サイリス
タ１２のＡ−Ｋ間には図２に示す波形の電圧が印加され
る。そして、避雷器１３に流れる容量分電流は、印加電
圧波形の内の変動する成分により生じるので、電圧波形
の周波数成分の中で一番低い交流系統の基本周波数（例
えば６０Ｈｚ）成分以上の変動による漏れ電流を除去で
きるように選定した。The time constants τ e and τ m are set to 16.67 mse.
The reason for setting the value above c is as follows. That is, the voltage having the waveform shown in FIG. 2 is applied between A and K of the thyristor 12. Since the capacitive component current flowing through the lightning arrester 13 is generated by the fluctuating component of the applied voltage waveform, the leakage due to the fluctuation of the lowest fundamental frequency component (for example, 60 Hz) of the AC system among the frequency components of the voltage waveform. It was selected so that the current could be removed.
【００１４】図３は上記構成において、時定数τe、τm
を０．１ｓｅｃにしたときの避雷器１３の正常時及び劣
化時における漏れ電流をシミュレーションにより求めた
ものを示す説明図である。図３から判るように、図１５
に示す従来のように避雷器３ｂ、４ｂに電流計３ｃ、４
ｃを接続した場合は、正常時と劣化時における検出電流
の変化が殆どない。また、サイリスタの運転制御角（コ
ンバータ運転時）により大きく電流値が変化する。これ
に対して、抵抗１４とコンデンサ１６との時定数τeを
０．１ｓｅｃとしたときの漏れ電流は、劣化時には正常
時の１．２〜１．３倍に増加する。また、電流計１５の
機械的な時定数τmも０．１ｓｅｃとしたときの漏れ電
流は、劣化時には正常時の２倍に増加する。そして、サ
イリスタの運転制御角による影響が少ない。FIG. 3 shows the time constants τ e and τ m in the above configuration.
It is an explanatory view showing what asked for a leakage current at the time of normality and deterioration of lightning arrester 13 when it was set to 0.1 sec by simulation. As can be seen from FIG. 3, FIG.
As in the prior art shown in Fig. 3, the lightning arresters 3b, 4b have ammeters 3c, 4
When c is connected, there is almost no change in the detected current during normal operation and deterioration. In addition, the current value changes greatly depending on the operation control angle of the thyristor (during converter operation). On the other hand, when the time constant τ e of the resistor 14 and the capacitor 16 is set to 0.1 sec, the leakage current increases 1.2 to 1.3 times that in the normal state during deterioration. Further, when the mechanical time constant τ m of the ammeter 15 is also set to 0.1 sec, the leakage current increases twice as much as the normal state at the time of deterioration. Further, the influence of the operation control angle of the thyristor is small.
【００１５】以上のように、抵抗１４とコンデンサ１６
との時定数を商用周波数の１サイクル時間より大きくし
たことにより、交流を含んだ直流電圧が印加される避雷
器１３劣化にともなう漏れ電流を精度よく検出できる。As described above, the resistor 14 and the capacitor 16
By setting the time constants of and to be larger than one cycle time of the commercial frequency, it is possible to accurately detect the leakage current due to the deterioration of the lightning arrester 13 to which a DC voltage including AC is applied.
【００１６】実施の形態２．図４は実施の形態２の構成
図、図５は図４の要部を模式的に示す斜視図である。図
４及び図５において、１２〜１６は実施の形態１のもの
と同様のものである。なお、１５ａは電流計１５の回転
軸、１５ｂは電流計１５の指針である。１７、１８は光
ファイバで構成した伝送手段で、各端部が指針１５ｂに
対向するように所定の間隔で配置してある。１９は光変
換手段で、伝送手段１７、１８と指針１５ｂとで構成し
てある。２０は発光手段、２１は受光手段、２２は演算
手段、２３は出力手段である。なお、２０〜２３は大地
電位部に配置し、光変換手段１９とは伝送手段１７、１
８で絶縁してある。Embodiment 2 4 is a configuration diagram of the second embodiment, and FIG. 5 is a perspective view schematically showing a main part of FIG. 4 and 5, 12 to 16 are the same as those in the first embodiment. In addition, 15 a is a rotating shaft of the ammeter 15, and 15 b is a pointer of the ammeter 15. Reference numerals 17 and 18 denote transmission means composed of optical fibers, which are arranged at predetermined intervals so that their ends face the pointer 15b. Reference numeral 19 denotes an optical conversion means, which is composed of transmission means 17 and 18 and a pointer 15b. 20 is a light emitting means, 21 is a light receiving means, 22 is a computing means, and 23 is an output means. 20 to 23 are arranged in the ground potential portion, and the light conversion means 19 are the transmission means 17 and 1
It is insulated with 8.
【００１７】上記構成において、電流計１５に抵抗分の
漏れ電流ｉRが流れて回転軸１５ａを介して指針１５ｂ
が振れると、伝送手段１７、１８間のギャップで発光手
段２０からの光を指針１５ｂが遮光する。この場合、指
針１５ｂの振れ角θと伝送手段１８への透過光量との関
係は、図６に示すようにデジタル的に変化する。この透
過光量の変化を受光手段２１で電気信号として出力し、
演算手段２２が透過光量の変化に応じて避雷器１３の耐
雷素子の劣化を検出して、表示灯、ブザー、指示計等の
出力手段２３から出力する。In the above structure, the resistance leakage current i R flows through the ammeter 15 and the pointer 15b passes through the rotary shaft 15a.
When oscillates, the pointer 15b blocks the light from the light emitting means 20 in the gap between the transmission means 17 and 18. In this case, the relationship between the deflection angle θ of the pointer 15b and the amount of light transmitted to the transmission means 18 changes digitally as shown in FIG. The light receiving means 21 outputs the change in the transmitted light amount as an electric signal,
The calculation means 22 detects the deterioration of the lightning protection element of the lightning arrester 13 according to the change in the amount of transmitted light, and outputs it from the output means 23 such as an indicator lamp, a buzzer, and an indicator.
【００１８】以上のように、避雷器１３の耐雷素子の劣
化による漏れ電流ｉRが徐々に増加するが、出力の透過
光量をデジタル的に変化させることにより、劣化検出が
容易にできる。また、耐雷素子の正常時に常時「出力あ
り」の状態にすることにより、発光手段２０等に異常が
発生した場合に耐雷素子が「正常」であるという認識が
されないようなフェイルセーフになっている。しかし、
逆に正常時に発光手段２０からの光を指針１５ｂが遮光
するように構成してもよい。As described above, the leakage current i R gradually increases due to deterioration of the lightning protection element of the lightning arrester 13, but deterioration can be easily detected by digitally changing the amount of transmitted light of the output. In addition, the lightning protection element is always in the “output enabled” state when it is normal, so that the lightning protection element is not recognized as being “normal” when an abnormality occurs in the light emitting means 20 or the like, thereby providing a failsafe. . But,
On the contrary, the pointer 15b may be configured to shield the light from the light emitting means 20 in a normal state.
【００１９】実施の形態３．図７は実施の形態３の構成
図、図８は図７の要部を模式的に示した斜視図である。
図７及び図８において、１２〜１６は実施の形態１のも
のと同様であり、１７、１８、２０〜２３は実施の形態
２のものと同様である。２４、２５は光ファイバで構成
した伝送手段で、各端部が指針１５ｂに対向するように
所定の間隔で配置してある。なお、指針１５ｂが各伝送
手段１７、１８、２４、２５と対向する部分は図９に示
すように形成してある。即ち、指針１５ｂの振れ角θが
小さい場合は、図９（ａ）のように伝送手段１７、１８
間及び伝送手段２４、２５間ともに遮光しない。振れ角
θが大きくなると、図９（ｂ）のように伝送手段１７、
１８間を遮光し、伝送手段２４、２５間は開放してい
る。そして、振れ角がさらに大きくなると、図９（ｃ）
のように伝送手段１７、１８間が開放し、伝送手段２
４、２５間を遮光する。２６は光変換手段で、伝送手段
１７、１８、２４、２５と指針１５ｂとで構成してい
る。Embodiment 3 FIG. 7 is a configuration diagram of the third embodiment, and FIG. 8 is a perspective view schematically showing a main part of FIG.
7 and 8, 12 to 16 are the same as those in the first embodiment, and 17, 18, 20 to 23 are the same as those in the second embodiment. Numerals 24 and 25 are transmission means composed of optical fibers, which are arranged at a predetermined interval so that each end faces the pointer 15b. The portion where the pointer 15b faces the respective transmission means 17, 18, 24, 25 is formed as shown in FIG. That is, when the deflection angle θ of the pointer 15b is small, as shown in FIG.
No light is blocked between the transmission means and the transmission means 24, 25. When the deflection angle θ becomes large, as shown in FIG.
18 is shielded from light, and transmission means 24 and 25 are opened. Then, when the deflection angle is further increased, FIG.
The transmission means 17 and 18 are opened as shown in FIG.
Shield between 4 and 25. Reference numeral 26 is an optical conversion means, which is composed of transmission means 17, 18, 24, 25 and a pointer 15b.
【００２０】上記構成において、電流計１５に抵抗分の
漏れ電流ｉRが流れて回転軸１５ａを介して指針１５ｂ
が振れると、振れ角θに応じて伝送手段１７、１８間は
図１０（ａ）のように透過光量が変化する。そして、伝
送手段２４、２５間は図１０（ｂ）のように透過光量が
変化する。図９及び図１０において、指針１５ｂの振れ
角θが小、中及び大に対して、各伝送手段１８、２５に
光が到達する状態を“１”、到達しない状態を“０”と
して、図７の演算手段２２の出力を３、２、１として対
応づけると図１１のように表すことができる。即ち、演
算手段２２の出力が“３”のときは耐雷素子が正常、
“２”のときは正常ではあるが、注意が必要である状
態、“１”のときは耐雷素子が劣化している状態であ
る。In the above structure, the leakage current i R of the resistance component flows through the ammeter 15 and the pointer 15b passes through the rotary shaft 15a.
When is shaken, the amount of transmitted light between the transmission means 17 and 18 changes according to the shake angle θ as shown in FIG. Then, the amount of transmitted light changes between the transmission means 24 and 25 as shown in FIG. In FIG. 9 and FIG. 10, when the deflection angle θ of the pointer 15b is small, medium and large, the state where light reaches each transmission means 18 and 25 is set to “1”, and the state where light does not reach is set to “0”. When the outputs of the calculation means 22 of No. 7 are associated with 3, 2, 1 as shown in FIG. That is, when the output of the computing means 22 is "3", the lightning protection device is normal,
When it is "2", it is normal, but caution is required, and when it is "1", the lightning protection element is in a deteriorated state.
【００２１】以上のように、伝送手段１７、１８及び２
４、２５を２系統にして２進数処理することにより、耐
雷素子の「正常」、「注意要」及び「劣化」の３状態を
判別することができる。さらに、伝送手段をｎ系統にす
ることにより（２n−１）の状態を判別することができ
る。As described above, the transmission means 17, 18 and 2
It is possible to determine the three states of the lightning protection element, which are "normal", "requiring attention", and "deterioration", by processing the binary numbers 4 and 25 into two systems. Furthermore, the state of (2 n -1) can be discriminated by setting the transmission means to n systems.
【００２２】実施の形態４．図１２は実施の形態４の構
成図、図１３は図１２の要部を模式的に示す斜視図であ
る。図１２及び図１３において、１２〜１６は実施の形
態１のものと同様であり、１７、１８、２０、２１は実
施の形態２のものと同様である。２７は指針１５ｂと伝
送手段１８の端部との間に配置したレンズで、伝送手段
１７の端面と伝送手段１８の端面とが共役点になるよう
にしてある。２８は光変換手段で、伝送手段１７、１
８、レンズ２８及び指針１５ｂで構成している。２９は
演算手段、３０は出力手段である。Embodiment 4 12 is a configuration diagram of the fourth embodiment, and FIG. 13 is a perspective view schematically showing a main part of FIG. 12 and 13, 12 to 16 are the same as those in the first embodiment, and 17, 18, 20, and 21 are the same as those in the second embodiment. Reference numeral 27 denotes a lens arranged between the pointer 15b and the end of the transmission means 18 so that the end surface of the transmission means 17 and the end surface of the transmission means 18 are conjugate points. 28 is an optical conversion means, which is a transmission means 17, 1
8, lens 28 and pointer 15b. Reference numeral 29 is a calculation means, and 30 is an output means.
【００２３】上記構成において、光ファイバで構成した
伝送手段１７から出た光は開口数ＮＡ＝０．３程度の発
散光となるが、レンズ２７により伝送手段１８の光ファ
イバのコア部１８ａに導かれる。また、避雷器１３の耐
雷素子の劣化にしたがって指針１５ｂが徐々に振れるの
で、伝送手段１７から出た光が指針１５ｂにより少しず
つ遮光され、図１４に示すように伝送手段１８に到達す
る透過光量が指針１５ｂの振れ角θが大きくなるにつれ
て減少する。この場合、透過光量が変化する指針１５ｂ
の振れ角θの範囲は、レンズ２７の開口（有効入射瞳
径）で決まる。伝送手段１８で伝送された光信号を受光
手段２１で電気信号に変換し、図１４に示す判定レベル
に達したら演算手段２９が「耐雷素子の劣化」として判
定し、出力手段３０で報知する。In the above structure, the light emitted from the transmission means 17 formed of an optical fiber becomes a divergent light with a numerical aperture NA = 0.3, but is guided to the core portion 18a of the optical fiber of the transmission means 18 by the lens 27. Get burned. Further, since the pointer 15b gradually shakes as the lightning protection element of the lightning arrester 13 deteriorates, the light emitted from the transmission means 17 is gradually shielded by the pointer 15b, and the transmitted light amount reaching the transmission means 18 as shown in FIG. It decreases as the deflection angle θ of the pointer 15b increases. In this case, the pointer 15b in which the amount of transmitted light changes
The range of the deflection angle θ of is determined by the aperture of the lens 27 (effective entrance pupil diameter). The optical signal transmitted by the transmitting means 18 is converted into an electric signal by the light receiving means 21, and when the judgment level shown in FIG. 14 is reached, the calculating means 29 judges as “deterioration of the lightning protection element”, and the output means 30 notifies it.
【００２４】以上のように、伝送手段１７から出た発散
光をレンズ２７により伝送手段１８のコア部１８ａに導
くことにより、漏れ電流の増加を連続的に監視できる。
また、判定レベル以上の透過光量があったときに正常と
しているので、発光手段等に異常があって光が消滅した
場合には耐雷素子の劣化として検出するためフェイルセ
ーフになっている。なお、耐雷素子の劣化時に光出力が
得られるようにしてもよい。As described above, by guiding the divergent light emitted from the transmission means 17 to the core portion 18a of the transmission means 18 by the lens 27, the increase of the leakage current can be continuously monitored.
Further, since it is considered normal when there is an amount of transmitted light equal to or higher than the determination level, when the light is extinguished due to an abnormality in the light emitting means or the like, it is detected as deterioration of the lightning protection element, which is fail safe. The light output may be obtained when the lightning protection element deteriorates.
【００２５】上記実施の形態２〜４において、指針１５
ｂで発光手段２０からの光を遮光するものについて説明
したが、指針１５ｂと連動するようにした遮光板を使用
しても同様の効果が期待できる。In the above second to fourth embodiments, the pointer 15
Although the light blocking means for blocking the light from the light emitting means 20 has been described with reference to b, the same effect can be expected by using a light blocking plate that is linked with the pointer 15b.
【００２６】上記実施の形態２〜４において、発光手段
２０を各光変換手段１９、２６、２８に配置しても同様
の効果が期待できる。In the above second to fourth embodiments, the same effect can be expected even if the light emitting means 20 is arranged in each of the light converting means 19, 26 and 28.
【００２７】[0027]
【発明の効果】請求項１の発明によれば、避雷器に接続
した抵抗とコンデンサとの時定数を商用周波数の１サイ
クル時間より大きくしたことにより、避雷器の劣化にと
もなう漏れ電流を精度よく検出できる。According to the invention of claim 1, the time constant of the resistor and the capacitor connected to the arrester is made larger than one cycle time of the commercial frequency, so that the leakage current due to the deterioration of the arrester can be accurately detected. .
【００２８】請求項２の発明によれば、電流計の指針で
遮光することにより徐々に変化する避雷器の漏れ電流を
デジタル的な変化に変換するので、漏れ電流の検出精度
を向上できる。また、電流計と受光手段との間を光を伝
送する伝送手段で接続することにより、受光手段から出
力した電気信号を演算する演算手段を大地電位側に設置
できるので、避雷器の漏れ電流の監視が容易にできる。According to the second aspect of the present invention, the leakage current of the lightning arrester, which gradually changes by shading with the pointer of the ammeter, is converted into a digital change, so that the detection accuracy of the leakage current can be improved. Further, by connecting the ammeter and the light receiving means with a transmitting means for transmitting light, a calculating means for calculating the electric signal output from the light receiving means can be installed on the ground potential side, so that the leakage current of the lightning arrester is monitored. Can be done easily.
【００２９】請求項３の発明によれば、請求項２に記載
の避雷器の漏れ電流監視装置において、電流計の指針と
伝送手段との間に集光用レンズを配置したことにより、
避雷器の漏れ電流を連続的に監視できる。According to the third aspect of the present invention, in the leakage current monitoring device for the lightning arrester according to the second aspect, the condenser lens is arranged between the pointer of the ammeter and the transmitting means.
The leakage current of the arrester can be continuously monitored.
【００３０】請求項４の発明によれば、電流計の指針で
遮光することにより徐々に変化する避雷器の漏れ電流を
デジタル的な変化に変換するので、漏れ電流の検出精度
を向上できる。また、電流計と発光手段及び受光手段と
の間を光を伝送する伝送手段で接続することにより、演
算手段を大地電位側に設置できるので、避雷器の漏れ電
流の監視が容易にできる。According to the fourth aspect of the present invention, the leakage current of the arrester, which gradually changes by shading with the pointer of the ammeter, is converted into a digital change, so that the detection accuracy of the leakage current can be improved. Further, by connecting the ammeter to the light emitting means and the light receiving means by the transmitting means for transmitting light, the arithmetic means can be installed on the ground potential side, so that the leakage current of the arrester can be easily monitored.
【００３１】請求項５の発明によれば、請求項４に記載
の避雷器の漏れ電流監視装置において、伝送手段を２系
統にして得られた光信号を演算することにより、避雷器
の劣化状態を段階ごとに監視することができる。According to the fifth aspect of the present invention, in the lightning arrester leakage current monitoring apparatus according to the fourth aspect, the optical signal obtained by using two transmission means is operated to calculate the deterioration state of the lightning arrester. Can be monitored for each.
【００３２】請求項６の発明によれば、請求項５に記載
の避雷器の漏れ電流監視装置において、各伝送手段を順
次２進数的に遮光することにより、避雷器の劣化状態を
段階ごとに監視することができる。According to the sixth aspect of the invention, in the lightning arrester leakage current monitoring device according to the fifth aspect, the deterioration state of the lightning arrester is monitored step by step by sequentially shielding each transmission means in binary. be able to.
【００３３】請求項７の発明によれば、請求項２から請
求項６のいずれかに記載の避雷器の漏れ電流監視装置に
おいて、発光手段、受光手段及び演算手段を大地電位部
に配置したことにより、高電圧側の電流計で検出した漏
れ電流を大地電位部で演算手段の出力値により確認する
ことができる。According to the invention of claim 7, in the leakage current monitor for a lightning arrester according to any one of claims 2 to 6, the light emitting means, the light receiving means and the computing means are arranged in the ground potential section. The leakage current detected by the high voltage side ammeter can be confirmed by the output value of the calculation means in the ground potential section.
【図１】 実施の形態１の発明の構成図である。FIG. 1 is a configuration diagram of an invention according to a first embodiment.
【図２】 図１のサイリスタのＡ−Ｋ間の電圧波形を示
す説明図である。FIG. 2 is an explanatory diagram showing a voltage waveform between AK of the thyristor of FIG.
【図３】 避雷器の正常時及び劣化時における漏れ電流
の比較を示す説明図である。FIG. 3 is an explanatory diagram showing a comparison of leakage current when the lightning arrester is normal and when it is deteriorated.
【図４】 実施の形態２の発明の構成図である。FIG. 4 is a configuration diagram of an invention according to a second embodiment.
【図５】 図４の要部を模式的に示した斜視図である。5 is a perspective view schematically showing a main part of FIG.
【図６】 指針の振れ角と透過光量との関係を示す説明
図である。FIG. 6 is an explanatory diagram showing a relationship between a deflection angle of a pointer and an amount of transmitted light.
【図７】 実施の形態３の発明の構成図である。FIG. 7 is a configuration diagram of an invention according to a third embodiment.
【図８】 図７の要部を模式的に示した斜視図である。FIG. 8 is a perspective view schematically showing a main part of FIG.
【図９】 指針の振れ角と伝送手段との関係を示す説明
図である。FIG. 9 is an explanatory diagram showing the relationship between the deflection angle of the pointer and the transmission means.
【図１０】 指針の振れ角と透過光量との関係を示す説
明図である。FIG. 10 is an explanatory diagram showing the relationship between the deflection angle of the pointer and the amount of transmitted light.
【図１１】 指針の振れ角と耐雷素子の状態との関係を
示す説明図である。FIG. 11 is an explanatory diagram showing the relationship between the deflection angle of the pointer and the state of the lightning protection element.
【図１２】 実施の形態４の発明の構成図である。FIG. 12 is a configuration diagram of the invention of the fourth embodiment.
【図１３】 図１２の要部を模式的に示した斜視図であ
る。FIG. 13 is a perspective view schematically showing a main part of FIG.
【図１４】 指針の振れ角と透過光量との関係を示した
説明図である。FIG. 14 is an explanatory diagram showing the relationship between the deflection angle of the pointer and the amount of transmitted light.
【図１５】 交直変換所の一般的な電気回路の構成図で
ある。FIG. 15 is a configuration diagram of a general electric circuit of an AC / DC converter.
【図１６】 一般に避雷器の耐雷素子として使用される
酸化亜鉛素子の等価回路を示す説明図である。FIG. 16 is an explanatory diagram showing an equivalent circuit of a zinc oxide element generally used as a lightning protection element of a lightning arrester.
１３ 避雷器、１４ 抵抗、１５ 電流計、１５ｂ 指
針、１６ コンデンサ、１７，１８，２４，２５ 伝送
手段、２０ 発光手段、２１ 受光手段、２２，２９
演算手段、２７ レンズ。13 lightning arrester, 14 resistance, 15 ammeter, 15b pointer, 16 condenser, 17, 18, 24, 25 transmitting means, 20 light emitting means, 21 light receiving means, 22, 29
Arithmetic means, 27 lenses.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田所 通博 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 (72)発明者 山本 吉彦 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 (72)発明者 山口 誠 東京都千代田区丸の内二丁目２番３号 三 菱電機株式会社内 (72)発明者 山田 正人 大阪府大阪市北区中之島３丁目３番22号 関西電力株式会社内 (72)発明者 廣瀬 昌弘 香川県高松市丸の内２番５号 四国電力株 式会社内 (72)発明者 畑野 雅幸 東京都中央区銀座六丁目15番１号 電源開 発株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tomohiro Tadokoro 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Yoshihiko Yamamoto 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Inventor Makoto Yamaguchi 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Masato Yamada 3-322, Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Kansai Electric Power Co., Inc. (72) Inventor Masahiro Hirose 2-5 Marunouchi, Takamatsu, Kagawa Shikoku Electric Power Company (72) Inventor Masayuki Hatano 6-15-1, Ginza, Chuo-ku, Tokyo Power source development Co., Ltd. Within
Claims (7)
避雷器の漏れ電流を検出する避雷器の漏れ電流監視装置
において、上記避雷器に抵抗と電流計とを直列接続し
て、上記抵抗と上記電流計との直列回路にコンデンサを
並列接続し、上記抵抗と上記コンデンサとの時定数を商
用周波数の１サイクル時間より大きくしたことを特徴と
する避雷器の漏れ電流監視装置。1. A leakage current monitoring device for a lightning arrester for detecting a leakage current of a lightning arrester to which a DC voltage containing an AC component is applied, wherein a resistor and an ammeter are connected in series to the lightning arrester, and the resistance and the current are connected. A leakage current monitoring device for a lightning arrester, wherein a capacitor is connected in parallel to a series circuit with a meter, and a time constant of the resistor and the capacitor is set to be larger than one cycle time of a commercial frequency.
装置において、電流計を可動指針形として指針を発光手
段と伝送手段との間に配置し、上記指針の振れ角度に応
じて上記指針が上記発光手段からの光を遮光し、上記伝
送手段により伝送された光信号を受光手段で電気信号に
変換して、上記電気信号を演算手段で演算して避雷器の
漏れ電流を検出するように構成したことを特徴とする避
雷器の漏れ電流監視装置。2. The lightning arrester leakage current monitoring device according to claim 1, wherein the ammeter is a movable pointer type, the pointer is arranged between the light emitting means and the transmitting means, and the pointer is arranged according to the deflection angle of the pointer. Shuts off the light from the light emitting means, converts the optical signal transmitted by the transmitting means into an electric signal by the light receiving means, calculates the electric signal by the arithmetic means, and detects the leakage current of the lightning arrester. A lightning arrester leakage current monitoring device characterized by being configured.
装置において、電流計の指針と伝送手段との間に集光用
のレンズを配置したことを特徴とする避雷器の漏れ電流
監視装置。3. The leakage current monitoring device for a lightning arrester according to claim 2, wherein a condenser lens is arranged between the pointer of the ammeter and the transmitting means.
装置において、発光手段が出力した光を第１の伝送手段
で伝送し、上記第１の伝送手段と所定の間隔をあけて第
２の伝送手段を対向させ、電流計を可動指針形として指
針を上記両伝送手段間に配置し、上記指針の振れ角度に
応じて上記第２の伝送手段へ入射する上記光を遮光し、
上記第２の伝送手段を介して伝送された光信号を受光手
段で電気信号に変換して、上記電気信号を演算手段で演
算して避雷器の漏れ電流を検出するように構成したこと
を特徴とする避雷器の漏れ電流監視装置。4. The lightning arrester leakage current monitoring device according to claim 1, wherein the light output from the light emitting means is transmitted by the first transmission means, and the light is emitted from the first transmission means at a predetermined distance from the second transmission means. And a pointer is arranged between the two transmitting means with the ammeter as a movable pointer type to shield the light incident on the second transmitting means according to the deflection angle of the pointer,
The optical signal transmitted through the second transmission means is converted into an electric signal by the light receiving means, and the electric signal is calculated by the arithmetic means to detect the leakage current of the lightning arrester. Lightning arrester leakage current monitoring device.
装置において、第２の伝送手段を複数個とし、電流計の
指針が上記第２の伝送手段へ入射する光を順次遮光する
ようにしたことを特徴とする避雷器の漏れ電流監視装
置。5. The lightning arrester leakage current monitoring device according to claim 4, wherein a plurality of second transmission means are provided, and the pointer of the ammeter sequentially blocks the light incident on the second transmission means. A leakage current monitoring device for a lightning arrester characterized by the above.
装置において、電流計の指針の第１の振れ角度で第２の
伝送手段の第１番目を遮光し、上記第１の振れ角度より
大きい第２の振れ角度で上記第１番目の上記第２の伝送
手段の遮光を解除して、上記第２の伝送手段の第２番目
を遮光することを特徴とする避雷器の漏れ電流監視装
置。6. The lightning arrester leakage current monitoring apparatus according to claim 5, wherein the first deflection angle of the pointer of the ammeter shields the first of the second transmission means from the first deflection angle. A leakage current monitoring device for a lightning arrester, characterized in that the light shielding of the first transmission means of the first transmission is canceled at a large second deflection angle to shield the second transmission means of the second transmission transmission.
の避雷器の漏れ電流監視装置において、発光手段、受光
手段及び演算手段を大地電位部に配置したことを特徴と
する避雷器の漏れ電流監視装置。7. The leakage current monitoring device for a lightning arrester according to claim 2, wherein the light emitting means, the light receiving means and the computing means are arranged in a ground potential portion. Monitoring equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23702695A JP3213685B2 (en) | 1995-09-14 | 1995-09-14 | Lightning arrester leakage current monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23702695A JP3213685B2 (en) | 1995-09-14 | 1995-09-14 | Lightning arrester leakage current monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0980109A true JPH0980109A (en) | 1997-03-28 |
| JP3213685B2 JP3213685B2 (en) | 2001-10-02 |
Family
ID=17009299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23702695A Expired - Fee Related JP3213685B2 (en) | 1995-09-14 | 1995-09-14 | Lightning arrester leakage current monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3213685B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809016A (en) * | 2014-02-18 | 2014-05-21 | 上海零线电气有限公司 | Leakage current sampling circuit checking method for electrical fire monitoring |
| JP2015219237A (en) * | 2014-05-13 | 2015-12-07 | エルエス産電株式会社Lsis Co., Ltd. | Arrestor verification device and method of high voltage dc power transmission system |
| CN111445665A (en) * | 2020-04-20 | 2020-07-24 | 国网山东省电力公司滨州市沾化区供电公司 | Electric measuring instrument anti-electric shock alarm device |
-
1995
- 1995-09-14 JP JP23702695A patent/JP3213685B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809016A (en) * | 2014-02-18 | 2014-05-21 | 上海零线电气有限公司 | Leakage current sampling circuit checking method for electrical fire monitoring |
| JP2015219237A (en) * | 2014-05-13 | 2015-12-07 | エルエス産電株式会社Lsis Co., Ltd. | Arrestor verification device and method of high voltage dc power transmission system |
| CN111445665A (en) * | 2020-04-20 | 2020-07-24 | 国网山东省电力公司滨州市沾化区供电公司 | Electric measuring instrument anti-electric shock alarm device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3213685B2 (en) | 2001-10-02 |
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