JPH0584642B2 - - Google Patents
Info
- Publication number
- JPH0584642B2 JPH0584642B2 JP61004130A JP413086A JPH0584642B2 JP H0584642 B2 JPH0584642 B2 JP H0584642B2 JP 61004130 A JP61004130 A JP 61004130A JP 413086 A JP413086 A JP 413086A JP H0584642 B2 JPH0584642 B2 JP H0584642B2
- Authority
- JP
- Japan
- Prior art keywords
- lightning arrester
- harmonic
- leakage current
- gain
- deterioration
- 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
Landscapes
- Testing Relating To Insulation (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Thermistors And Varistors (AREA)
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は非直線性の優れた抵抗体、例えば酸化
亜鉛素子を用いた避雷器の劣化検出装置に関する
もので、特に避雷器が高電圧交流送電路に接続さ
れた状態で精度良く劣化検出ができる様にしたも
のである。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a deterioration detection device for a lightning arrester using a resistor with excellent nonlinearity, such as a zinc oxide element. This allows for accurate deterioration detection in the connected state.
［発明の技術的背景とその問題点］
酸化亜鉛素子を用いた避雷器の劣化検出を精度
良く行うためには抵抗分漏れ電流の測定を行う必
要があり、従来例えば、第４図に示すものが用い
られている（特開昭55−32439号公報参照）。即ち
送電線路１と大地間に接続された避雷器２に流れ
る漏れ電流を抵抗あるいはCT等の検出器３によ
り電圧信号に変換し、劣化検出装置４に導く。酸
化亜鉛素子の等価回路は第５図の様に書くことが
でき、全体の漏れ電流I0は、劣化によつても変化
しない容量分ICと劣化により増加する抵抗分IRと
のベクトル和である。通常IC≫IRであるので、第
６図の様にI0の波高値＝ICの波高値となる。この
点を応用して劣化検出装置４では全漏れ電流I0か
ら、シユミツト回路５、ローパスフイルタ６によ
り全漏れ電流に同相な商用周波信号を取り出し、
ピーク値検出回路８の信号によりオートゲインコ
ントロール回路９を制御して、前記商用周波信号
の振幅を全漏れ電流のそれに合せる。位相調整回
路７により全漏れ電流I0の容量分電流からの位相
遅れを補償する。この様にして得られたキヤンセ
ル波を差動アンプ１０のマイナス端子に入力し、
全漏れ電流I0より容量分電流ICを消去して抵抗分
漏れ電流を得、その波高値をメータ１１で読む。[Technical background of the invention and its problems] In order to accurately detect the deterioration of a lightning arrester using a zinc oxide element, it is necessary to measure the resistance leakage current. (Refer to Japanese Patent Application Laid-Open No. 55-32439). That is, a leakage current flowing through a lightning arrester 2 connected between a power transmission line 1 and the ground is converted into a voltage signal by a detector 3 such as a resistor or CT, and guided to a deterioration detection device 4. The equivalent circuit of a zinc oxide element can be written as shown in Figure 5, and the total leakage current I 0 is the vector sum of the capacitance I C that does not change even with deterioration and the resistance I R that increases due to deterioration. It is. Normally, I C ≫ I R , so as shown in FIG. 6, the peak value of I 0 = the peak value of I C. Applying this point, the deterioration detection device 4 extracts a commercial frequency signal that is in phase with the total leakage current from the total leakage current I0 using the Schmitts circuit 5 and the low-pass filter 6.
An auto gain control circuit 9 is controlled by the signal from the peak value detection circuit 8 to match the amplitude of the commercial frequency signal to that of the total leakage current. The phase adjustment circuit 7 compensates for the phase delay from the capacity current of the total leakage current I 0 . Input the cancel wave obtained in this way to the negative terminal of the differential amplifier 10,
Eliminate the capacitance current I C from the total leakage current I 0 to obtain the resistance leakage current, and read its peak value with the meter 11.
この装置を現地の避雷器に取り付けて常時抵抗
分漏れ電流を監視したところ、測定値が時間的に
大きく変動し、ちようど毎日の系統の負荷曲線の
様に１日単位でほぼ同様のパターンをくり返し
た。そこで電流波形を調査したところ第５高調波
が含まれており、これが時間的に変動しているこ
とがわかつた。 When we attached this device to a local lightning arrester and constantly monitored the resistance leakage current, the measured values fluctuated greatly over time, and the pattern was almost the same on a daily basis, just like the daily grid load curve. repeated. When we investigated the current waveform, we found that it contained the fifth harmonic, and that this varied over time.
通常の使用状態においては避雷器の漏れ電流は
IC≫IRであるが、系統電圧に高調波分が含まれて
いると、容量分電流はその微分となるため高調波
分が強調されて出てくる。このため抵抗分漏れ電
流の変化がマスクされてしまう。 Under normal usage conditions, the leakage current of the lightning arrester is
I C ≫ I R , but if the grid voltage includes harmonics, the capacitance current will be its derivative, so the harmonics will be emphasized. Therefore, changes in resistance leakage current are masked.
この問題に対して例えば特公昭57−10651号公
報では、漏れ電流の基本波分のみを抽出する方法
をとつているが、この方式では酸化亜鉛素子の抵
抗分が非直線であるために、抵抗分電流に含まれ
る高調波がカツトされ誤差が大きくなる。 To deal with this problem, for example, Japanese Patent Publication No. 10651/1983 uses a method of extracting only the fundamental wave component of the leakage current, but in this method, the resistance component of the zinc oxide element is non-linear, so the resistance The harmonics included in the divided current are cut out, increasing the error.
また他の例では漏れ電流の第３高調波分のみを
抽出する方法（日立制作所カタログ0958B「避雷
器漏れ電流測定器」）があるが、この方法では逆
に基本波分がカツトされるため誤差が大きくな
る。またリニアライザで補正するにしても素子径
により補正が異なり、また劣化の進行に伴い第３
高調波の含有率が変化する場合も考えられるので
十分でない。 Another example is a method that extracts only the third harmonic component of the leakage current (Hitachi Catalog 0958B "Surge Arrester Leakage Current Measuring Instrument"), but this method conversely cuts out the fundamental wave component, resulting in an error. becomes larger. Furthermore, even if correction is performed using a linearizer, the correction will differ depending on the element diameter, and as deterioration progresses, the third
This is not sufficient because the harmonic content may change.
［発明の目的］
本発明は、従来技術の上記問題点に鑑みなされ
たもので、現地において精度良く避雷器の変化を
検出できる劣化検出装置を得ることを目的とす
る。[Object of the Invention] The present invention was made in view of the above-mentioned problems of the prior art, and an object of the present invention is to obtain a deterioration detection device that can accurately detect changes in a lightning arrester on-site.
［発明の概要］
本発明の避雷器の劣化検出装置は、避雷器に送
電線路の常規対地電圧を印加した状態で避雷器電
流を測定して避雷器の劣化検出をするものにおい
て、避雷器電流の入力側に前記電流の第５高調波
分以上を除去するローパスフイルタを設けたもの
である。[Summary of the Invention] The deterioration detection device for a lightning arrester of the present invention detects the deterioration of the lightning arrester by measuring the surge arrester current while applying the normal ground voltage of the power transmission line to the surge arrester. A low-pass filter is provided to remove the fifth harmonic or higher of the current.
［発明の実施例］
以下、図面を参照しながら本発明の劣化検出装
置の構成と作用について説明する。なお従来例と
同様の部分は同じ番号を付して説明を省略する。[Embodiments of the Invention] Hereinafter, the configuration and operation of the deterioration detection device of the present invention will be described with reference to the drawings. Note that the same parts as in the conventional example are given the same numbers and the explanation is omitted.
＊構成
第１図に示す如く、本実施例においては検出器
３により電圧に変換された信号はローパスフイル
タ１２に入る様に構成されている。このローパス
フイルタ１２は、そのゲインが、第２図の様に基
本f0及び第３調波（3f0）のみを通し、第５調波
（5f0）以上の高調波はカツトする様なものであ
る。この場合、第５調波に対するゲインＧ（5f0）
は基本波のゲインＧ（f0）に対し−10db以下とし、
第３調波に対するゲインＧ（3f0）は基本波のそれ
に対し±1db以内とするのが望ましい。またゲイ
ンが落ちる付近で入出力時間差ｔが変化するが、
基本波の時間遅れｔ（f0）と第３調波の時間遅れ
ｔ（3f0）の差の絶対値｜ｔ（f0）−ｔ（3f0）｜≦
1msecとするのが望ましい。*Configuration As shown in FIG. 1, this embodiment is configured so that the signal converted into voltage by the detector 3 enters the low-pass filter 12. This low-pass filter 12 has a gain that passes only the fundamental f 0 and the third harmonic (3f 0 ) as shown in Figure 2, and cuts out harmonics above the fifth harmonic (5f 0 ). It is. In this case, the gain G for the fifth harmonic (5f 0 )
is -10db or less with respect to the fundamental wave gain G (f 0 ),
It is desirable that the gain G (3f 0 ) for the third harmonic is within ±1 db with respect to that of the fundamental wave. Also, the input/output time difference t changes near the point where the gain drops.
Absolute value of the difference between the fundamental wave time delay t(f 0 ) and the third harmonic time delay t(3f 0 ) | t(f 0 )−t(3f 0 ) | ≦
It is desirable to set it to 1 msec.
＊作用
以上の様な構成とすることにより、漏れ電流に
含まれる第５高調波及びそれ以上の高調波は確実
に除去される。前述の実測によれば漏れ電流に含
まれる第５高調波分は最大で全漏れ電流の約30％
であつた。通常、避雷器の漏れ電流に含まれる抵
抗分漏れ電流の割合は約10％程度であり、劣化判
定に用いる抵抗分漏れ電流リミツト値は全漏れ電
流の30％以上であるから、本実施例では、第５高
調波分に対するゲインを基本波に対するゲインに
対して−10db（0.3）以下にしてあるので高調波
分に乱されずに確実に劣化検出ができる。*Operation With the above configuration, the fifth harmonic and higher harmonics included in the leakage current are reliably removed. According to the actual measurements mentioned above, the fifth harmonic component included in the leakage current is approximately 30% of the total leakage current at maximum.
It was hot. Normally, the proportion of resistance leakage current included in the leakage current of a lightning arrester is about 10%, and the resistance leakage current limit value used for deterioration judgment is 30% or more of the total leakage current. Since the gain for the fifth harmonic component is set to less than -10 db (0.3) with respect to the gain for the fundamental wave, deterioration can be reliably detected without being disturbed by the harmonic component.
なお、実測においては系統電圧に第３高調波は
含まれていなかつたが、これは変圧器のデルタ巻
線により除去されたためと思われ、通常の系統条
件では考慮する必要がないと思われる。 In addition, although the third harmonic was not included in the system voltage in the actual measurement, this is probably because it was removed by the delta winding of the transformer, and there is no need to consider it under normal system conditions.
一方、避雷器の抵抗分漏れ電流には通常10％前
後の第３高調波分が含まれており、第５高調波分
及び、それ以上の高次調波分は２〜３％以下で無
視できる。さらに劣化の進行に伴う非直線性の低
下により、抵抗分漏れ電流中の高調波分の割合は
低下していくので、上記のローパスフイルタ１２
により第５高調波分以上を除去しても精度に影響
を与えることはない。 On the other hand, the resistance leakage current of a lightning arrester usually contains around 10% of the 3rd harmonic, and the 5th and higher harmonics can be ignored at 2 to 3% or less. . Furthermore, as the nonlinearity decreases as the deterioration progresses, the proportion of harmonics in the resistance leakage current decreases, so the low-pass filter 12 described above
Therefore, even if the fifth harmonic or more is removed, accuracy will not be affected.
また第３高調波のゲインを基本波のゲインの±
1db（0.89）以下、第３高調波と基本波の時間遅
れの差の絶対値を±1ms以内に抑えているので、
抵抗分漏れ電流波形の伝送歪みを抑えて、精度維
持に寄与している。 Also, the gain of the third harmonic is ± the gain of the fundamental wave.
Since the absolute value of the difference in time delay between the third harmonic and the fundamental wave is suppressed to less than 1db (0.89) and within ±1ms,
This suppresses transmission distortion of the resistance leakage current waveform, contributing to maintaining accuracy.
［発明の効果］
以上説明した様に、本発明の劣化検出装置によ
れば、ローパスフイルタを配設して第５高調波成
分を除去することにより、避雷器が高電圧交流送
電器に接続された状態で精度良く避雷器の劣化検
出をでき、異常の早期発見、系統の供給信頼度向
上に大きく寄与するものである。[Effects of the Invention] As explained above, according to the deterioration detection device of the present invention, by disposing a low-pass filter to remove the fifth harmonic component, a lightning arrester can be connected to a high-voltage AC power transmitter. This enables the deterioration of lightning arresters to be detected with high precision under the current conditions, greatly contributing to the early detection of abnormalities and improving the reliability of system supply.
第１図は本発明の劣化検出装置の構成を示すブ
ロツク回路図、第２図及び第３図はそれぞれ本発
明の劣化検出装置に使用するフイルタ特性を示す
グラフ図、第４図は従来の劣化検出装置の構成を
示すブロツク回路図、第５図は酸化亜鉛素子の等
価回路を示す回路図、第６図は避雷器の漏れ電流
波形のグラフである。
１……送電線路、２……避雷器、３……検出
器、４……劣化検出装置、５……シユミツト回
路、６……ローパスフイルタ、７……位相調整回
路、８……ピーク値検出回路、９……オートゲイ
ンコントロール回路、１０……作動アンプ、１１
……メータ、１２……ローパスフイルタ。
FIG. 1 is a block circuit diagram showing the configuration of the deterioration detection device of the present invention, FIGS. 2 and 3 are graphs showing filter characteristics used in the deterioration detection device of the present invention, and FIG. 4 is a diagram showing the conventional deterioration detection device. FIG. 5 is a block circuit diagram showing the configuration of the detection device, FIG. 5 is a circuit diagram showing an equivalent circuit of a zinc oxide element, and FIG. 6 is a graph of a leakage current waveform of a lightning arrester. DESCRIPTION OF SYMBOLS 1...Power transmission line, 2...Surge arrester, 3...Detector, 4...Deterioration detection device, 5...Schmitts circuit, 6...Low pass filter, 7...Phase adjustment circuit, 8...Peak value detection circuit , 9... Auto gain control circuit, 10... Operating amplifier, 11
...Meter, 12...Low pass filter.
Claims (1)
状態で、避雷器電流を測定して避雷器の劣化を検
出するものにおいて、 避雷器電流の入力側に前記電流の第５高調波分
以上を除去するローパスフイルタを設けたことを
特徴とする避雷器の劣化検出装置。 ２ 前記ローパスフイルタが商用周波数のゲイン
に対して第３高調波分のゲインが±1db以内、第
５高調波分のゲインが−10db以下のローパスフ
イルタである特許請求の範囲第１項記載の避雷器
の劣化検出装置。[Scope of Claims] 1. In a device that detects deterioration of a lightning arrester by measuring the lightning arrester current while applying the normal ground voltage of a power transmission line to the lightning arrester, the fifth harmonic component of the current is applied to the input side of the lightning arrester current. A deterioration detection device for a lightning arrester, characterized in that it is provided with a low-pass filter that removes the above. 2. The lightning arrester according to claim 1, wherein the low-pass filter has a gain of the third harmonic within ±1 db and a gain of the fifth harmonic of -10 db or less relative to the gain of the commercial frequency. deterioration detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP413086A JPS62163301A (en) | 1986-01-14 | 1986-01-14 | Arrestor deterioration detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP413086A JPS62163301A (en) | 1986-01-14 | 1986-01-14 | Arrestor deterioration detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62163301A JPS62163301A (en) | 1987-07-20 |
| JPH0584642B2 true JPH0584642B2 (en) | 1993-12-02 |
Family
ID=11576200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP413086A Granted JPS62163301A (en) | 1986-01-14 | 1986-01-14 | Arrestor deterioration detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62163301A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0725720Y2 (en) * | 1988-10-27 | 1995-06-07 | 日本碍子株式会社 | Deterioration detector of lightning protection insulator |
| JP4708949B2 (en) * | 2005-10-18 | 2011-06-22 | 河村電器産業株式会社 | Tracking detector |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53107941U (en) * | 1977-02-04 | 1978-08-30 | ||
| JPS6029074B2 (en) * | 1977-08-19 | 1985-07-08 | 三菱電機株式会社 | Lightning arrester deterioration detection method |
| JPS55176502U (en) * | 1979-06-06 | 1980-12-18 |
-
1986
- 1986-01-14 JP JP413086A patent/JPS62163301A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62163301A (en) | 1987-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205562653U (en) | Current inducer | |
| US5128611A (en) | Electronic electricity meter | |
| JP2000346884A (en) | Diode microwave power sensor | |
| KR100498927B1 (en) | Method and Device for measuring resistive leakage current by time-delay synthesis method in deciding the deterioration diagnosis of arrester | |
| US4992740A (en) | Apparatus which uses a simulated inductor in the measurement of an electrical parameter of a device under test | |
| CN116256685B (en) | High-frequency electrosurgical analyzer calibration device and calibration method | |
| US4126825A (en) | Electronic current transducer for high voltage transmission lines | |
| US5027060A (en) | Measuring device of the rms value of a signal, notably for current measurement in a solid-state trip device | |
| JPH0584642B2 (en) | ||
| US4419660A (en) | Electric filter equipment | |
| JP2560772B2 (en) | Deterioration detection device for lightning arrester | |
| CN2195763Y (en) | Antijamming local electric discharge detecting instrument | |
| JP2869461B2 (en) | Signal shaping circuit device for measuring bioelectric signals | |
| US4733173A (en) | Electronic component measurement apparatus | |
| JP3240186B2 (en) | Method and apparatus for automatically adjusting sensitivity of current transformer for detecting leakage current | |
| CN206757023U (en) | A kind of leakage current of an arrester compensation system under electric field environment | |
| US20220140592A1 (en) | Multi-frequency ground fault circuit interrupter apparatuses, systems, and method | |
| US11733270B2 (en) | Signal-processing circuit | |
| JP3999303B2 (en) | Current detector | |
| US20250277823A1 (en) | Current sensor and control method thereof | |
| CN107192973A (en) | Leakage current of an arrester compensation system and method under a kind of electric field environment | |
| JPH01272075A (en) | Deterioration detecting device for lightning arrestor | |
| JPS60161517A (en) | Measuring apparatus | |
| JPH1038947A (en) | Measuring apparatus for resistance-portion leakage current in zinc oxide arrester | |
| JPH0317462Y2 (en) |