JPH031476A - Sensing device for leak current of lightning arrester - Google Patents
Sensing device for leak current of lightning arresterInfo
- Publication number
- JPH031476A JPH031476A JP3531590A JP3531590A JPH031476A JP H031476 A JPH031476 A JP H031476A JP 3531590 A JP3531590 A JP 3531590A JP 3531590 A JP3531590 A JP 3531590A JP H031476 A JPH031476 A JP H031476A
- Authority
- JP
- Japan
- Prior art keywords
- lightning arrester
- current
- voltage
- amplifier
- winding
- 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
- 238000004804 winding Methods 0.000 claims abstract description 37
- 238000001514 detection method Methods 0.000 claims description 37
- 238000012360 testing method Methods 0.000 claims description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 230000006866 deterioration Effects 0.000 abstract description 13
- 230000005856 abnormality Effects 0.000 abstract description 6
- 229910000808 amorphous metal alloy Inorganic materials 0.000 abstract description 6
- 238000007689 inspection Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 239000011162 core material Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000011787 zinc oxide Substances 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、電力系統に発生する雷サージの電圧を制限
してこの電力系統に接続される電気機器を絶縁破壊から
保護するために設けられる避雷器、特に避雷素子が酸化
亜鉛からなる酸化亜鉛形避雷器の漏れ電流を計測して避
雷素子の劣化を検出するための避雷器漏れ電流検出装置
、特に漏れ電流検出方式にアモルフブス合金を鉄心材料
に使用した貫通形の変圧器を使用した避雷器漏れ電流検
出装置に関する。[Detailed Description of the Invention] [Industrial Application Field] This invention is provided to limit the voltage of lightning surges generated in a power system to protect electrical equipment connected to this power system from dielectric breakdown. A lightning arrester leakage current detection device for measuring the leakage current of a lightning arrester, especially a zinc oxide type lightning arrester whose lightning arrester element is made of zinc oxide, and detecting the deterioration of the lightning arrester element.In particular, the leakage current detection method uses amorphous bus alloy as the iron core material. This invention relates to a lightning arrester leakage current detection device using a feed-through transformer.
最近の避雷器は酸化亜鉛を主成分とする避雷素子を１個
又は複数個直列に接続したものが使用されている。酸化
亜鉛形の避雷素子は常時印加されているその電力系統の
定格電圧程度では数百μへ程度の微小電流が流れる。こ
のような微小電流では避雷素子の温度上昇や経年劣化の
原因になることはないので、避雷素子に直列に放電ギャ
ップを設けて常時は電流が流れないようにしておく必要
がない。BACKGROUND OF THE INVENTION Recent lightning arresters include one or more lightning arrester elements whose main component is zinc oxide connected in series. In a zinc oxide type lightning arrester element, a minute current of several hundred microns flows through it at the rated voltage of the power system, which is constantly applied. Such a small current will not cause a temperature rise or deterioration over time of the lightning arrester element, so there is no need to provide a discharge gap in series with the lightning arrester element to prevent current from flowing at all times.
雷サージなどの異常電圧の波高値を制限するために、避
雷器が動作して大きな電流が流れたり、気象条件に基づ
く熱的サイクルなどによって避雷素子の劣化が進むと、
前述の常時流れている微小電流が増大して避雷素子の温
度が上昇し、ついには熱的に耐えられなくなって絶縁破
壊を起こすに至ることが知られている。このような現象
を回避するために微小電流を計測してその増加を検出し
所定の値以上になると避雷素子を交換するという方法が
採られる。避雷器に常時流れる微小電流は通常漏れ電流
と呼ばれている。In order to limit the peak value of abnormal voltages such as lightning surges, the lightning arrester operates and a large current flows, or when the lightning arrester element deteriorates due to thermal cycles based on weather conditions, etc.
It is known that the above-mentioned constantly flowing microcurrent increases and the temperature of the lightning arrester element rises, eventually becoming unbearable thermally and causing dielectric breakdown. In order to avoid such a phenomenon, a method is adopted in which a minute current is measured, an increase in the current is detected, and when the current exceeds a predetermined value, the lightning arrester element is replaced. The minute current that constantly flows through a lightning arrester is usually called leakage current.
第２図は貫通形変圧器を使用した避雷器漏れ電流検出装
置を示す回路構成図であり、この発明と同じ発明者によ
って提案されたもので（特願平１−４１７１号）、貫通
形変流器を使用していた従来の技術に対して、負荷電流
をとらないで二次側電圧を電圧増幅することにより避雷
器漏れ電流検出装置を構成したものである。Figure 2 is a circuit configuration diagram showing a lightning arrester leakage current detection device using a feedthrough transformer, which was proposed by the same inventor as this invention (Japanese Patent Application No. 1-4171). In contrast to the conventional technology that uses a surge arrester leakage current detection device, this device amplifies the secondary voltage without taking the load current.
この図において、高圧線１に接続されている避雷器２の
接地線４を巻数が１ターンの一次巻線とした貫通形の変
圧器５が設けられている。接地線４には避雷器２が動作
したときに大電流が流れるので、断面積の大きい電線が
使用される。したがって、変圧器の一次側巻線の巻数を
複数にするのは実用上困難なので貫通形の変圧器が使用
される。In this figure, a through-type transformer 5 is provided in which a grounding wire 4 of a lightning arrester 2 connected to a high-voltage line 1 is a primary winding having one turn. Since a large current flows through the grounding wire 4 when the lightning arrester 2 operates, an electric wire with a large cross-sectional area is used. Therefore, it is practically difficult to increase the number of turns of the primary winding of a transformer, so a through-type transformer is used.
常時この変圧器５を設置しておく場合には、接地＆ＩＩ
４と変圧器５との間の絶縁強度として避雷器２の接地側
の絶縁強度と同等のものが必要である。If this transformer 5 is always installed, ground &
The insulation strength between the lightning arrester 4 and the transformer 5 must be equivalent to the insulation strength on the ground side of the lightning arrester 2.
したがって、接地線４を貫通させる貫通穴の直径はこの
絶縁強度を確保するのに必要な寸法でなければならない
。Therefore, the diameter of the through hole through which the ground wire 4 is passed must have a size necessary to ensure this insulation strength.
この変圧器５の鉄心５１は直線性に優れたコバルト系ア
モルファス合金薄帯を巻回して形成したリング状のもの
である。変圧器５の二次巻線５２の誘起電圧は増幅器１
０の入力端子となっており、この増幅器１０で増幅した
後積分器１１で積分し、この積分器１１の出力電圧を差
動増幅器１２の入力電圧にする。電圧増幅器１０は電圧
を増幅する電圧増幅器なので入力インピーダンスが大き
く二次−ｔ１！５２は実質的に開放状態にあって負荷電
流は零とみなすことができる。したがって、接地＆Ｉ４
に流れる漏れ電流は全て変圧器５の励磁電流になってい
る。直線性の優れた磁気特性を持つ磁性体で鉄心５１を
構成しているのでこの鉄心５１内に発生する磁束は励磁
電流である漏れ電流に位相、波形とも同じになっている
。二次電圧はこの磁束の時間的変化量である１ターン当
たりの電圧に二次巻線の巻数倍したものなので漏れ電流
とは位相が異なり歪み波形の場合は波形も変わってしま
う、このような変化を補正するために、二次電圧を積分
器１１で積分することにより位相、波形とも漏れ電流と
同じになるようにしている。The iron core 51 of the transformer 5 is a ring-shaped core formed by winding a cobalt-based amorphous alloy ribbon with excellent linearity. The induced voltage in the secondary winding 52 of the transformer 5 is applied to the amplifier 1.
After being amplified by this amplifier 10, it is integrated by an integrator 11, and the output voltage of this integrator 11 is used as the input voltage of a differential amplifier 12. Since the voltage amplifier 10 is a voltage amplifier that amplifies voltage, the input impedance is large, and the secondary -t1!52 is substantially in an open state, so that the load current can be considered to be zero. Therefore, ground & I4
All leakage current flowing through the transformer 5 becomes the excitation current of the transformer 5. Since the iron core 51 is made of a magnetic material with excellent linear magnetic properties, the magnetic flux generated within the iron core 51 has the same phase and waveform as the leakage current, which is the excitation current. The secondary voltage is the voltage per turn, which is the amount of change in magnetic flux over time, multiplied by the number of turns of the secondary winding, so its phase differs from that of the leakage current, and in the case of a distorted waveform, the waveform also changes. In order to correct such changes, the secondary voltage is integrated by an integrator 11 so that both the phase and the waveform become the same as the leakage current.
第３図は漏れ電流の各成分について説明するための波形
図である。上の図は高圧線１の電圧Ｖを示しておりその
波形は正弦波である。下の図は漏れ電流の波形を示して
おり、−点ＩＩｖＡで示すＩｃはキャパシタンス成分、
実線で示すＩＩは抵抗成分、点線で示すＩアは合成電流
としての漏れ電流である。キャパシタンス成分Ｉｃは電
圧■と同じく正弦波で位相は９０度進んでいる。抵抗成
分１ｍは避雷素子の非線型特性のために波高部が尖った
非正弦波である０合成電流としての漏れ電流■！はこれ
ら２つの成分の和となっている。FIG. 3 is a waveform diagram for explaining each component of leakage current. The upper diagram shows the voltage V of the high voltage line 1, and its waveform is a sine wave. The figure below shows the leakage current waveform, where Ic shown at - point IIvA is the capacitance component,
II indicated by a solid line is a resistance component, and IA indicated by a dotted line is a leakage current as a composite current. The capacitance component Ic is a sine wave like the voltage (2), and has a phase lead of 90 degrees. The resistance component of 1m is a leakage current as a zero composite current which is a non-sinusoidal wave with a sharp peak due to the non-linear characteristics of the lightning arrester element■! is the sum of these two components.
キャパシタンス成分ＩＣの大きさは数１００ μＡであ
り、劣化しない避雷器での抵抗成分ＩＩはこれより１指
手さい値である。この図は抵抗成分Ｉｎを誇張して図示
しである。The magnitude of the capacitance component IC is several hundred microamperes, and the resistance component II in a lightning arrester that does not deteriorate is one order smaller than this value. This figure shows the resistance component In in an exaggerated manner.
前述のように劣化によって増大するのは抵抗成分１１で
あり、キャパシタンス成分■、は変化しない、差動増幅
器１２はこのキャパシタンス成分１ｃを除いて漏れ電流
の変化の検出感度を上げるためのものである。コンデン
サ３１のインピーダンスに対して接地側抵抗３２の抵抗
は充分小さく設定されていて接地側抵抗３２に流れる電
流は殆どコンデンサ３１のインピーダンスで決まってい
るので、接地側抵抗３２の電圧は高圧線１の電圧に介し
て位相が９０度進んだものになっている。したがって、
この電圧はキャパシタンス成分と同相になるので接地側
抵抗３２か増幅器１０の増幅率を調整して漏れ電流の中
のキャパシタンス成分ＩＣによる電圧が差動増幅器１２
の出力電圧に含まれないように打ち消すことができる。As mentioned above, it is the resistance component 11 that increases due to deterioration, and the capacitance component 1 does not change.The differential amplifier 12 removes this capacitance component 1c to increase the detection sensitivity of changes in leakage current. . The resistance of the ground side resistor 32 is set to be sufficiently small compared to the impedance of the capacitor 31, and the current flowing through the ground side resistor 32 is almost determined by the impedance of the capacitor 31, so the voltage of the ground side resistor 32 is The phase is advanced by 90 degrees depending on the voltage. therefore,
This voltage is in phase with the capacitance component, so by adjusting the grounding resistor 32 or the amplification factor of the amplifier 10, the voltage due to the capacitance component IC in the leakage current is transferred to the differential amplifier 12.
can be canceled out so that it is not included in the output voltage.
酸化亜鉛形避雷素子の劣化はサージが侵入して避雷器が
動作して大電流が流れ、その結果、素子の全体または一
部が温度上昇することによって進展する。したがって、
サージの侵入頻度やその際なかれる大電流とその流通時
間などの影響で劣化の進む速度は変化する。しかし、い
ずれにしても短時間に劣化が進展する訳ではないので、
避雷器漏れ電流検出装置による漏れ電流の検査は１ケ月
に１回程度の低頻度でよく、その代わり、避雷器として
の寿命は電力系統に接続される他の電気機器と同様に数
十年の寿命が要求される。避雷器漏れ電流検出装置を設
置する目的も避雷器がこの長寿命を達成するために、避
雷素子の劣化を事前に検査し、早めに取り換えて信鯨性
を高めようとするものである。したがってまた、避雷器
漏れ電流検出装置そのものも、避雷器間等の信鯨性が要
求され、そのために、避雷素子そのものと同様に避雷器
の劣化の程度を誤判断することのないようその特性の検
査を定期的に行う必要がある。Deterioration of zinc oxide type lightning arrester elements progresses when a surge enters, the arrester operates, a large current flows, and as a result, the temperature of the entire or part of the element increases. therefore,
The speed at which deterioration progresses varies depending on the frequency of surges, the large currents that are generated during surges, and the time during which they flow. However, in any case, the deterioration does not progress in a short period of time, so
Leakage current detection using a lightning arrester leakage current detection device only needs to be carried out as infrequently as once a month; instead, lightning arresters have a lifespan of several decades, similar to other electrical equipment connected to the power system. required. The purpose of installing a lightning arrester leakage current detection device is to increase reliability by inspecting the deterioration of the lightning arrester element in advance and replacing it early so that the lightning arrester can achieve this long service life. Therefore, the lightning arrester leakage current detection device itself is required to have reliability between the arresters, etc., and for this reason, its characteristics must be periodically inspected to avoid misjudging the degree of deterioration of the arrester, just like the lightning arrester itself. It is necessary to do so.
避雷器漏れ電流検出装置の特性が変化する要因としては
、電子部品の劣化などによって増幅器の増幅率が変化す
るなどがあるが、特にアモルファス合金は長年月の間に
結晶化が進むなどして磁気特性が変化する可能性のある
ことが指摘されており、このアモルファス合金を鉄心材
料に使用した変圧器を使用する避雷器漏れ電流検出装置
ではアモルファス合金の磁気特性が漏れ電流の計測誤差
に直接影響する重要な特性であることから、避雷器漏れ
電流形装置の特性変化の検査は特に重要である。Factors that can cause changes in the characteristics of lightning arrester leakage current detection devices include changes in the amplification factor of the amplifier due to deterioration of electronic components, etc. In particular, amorphous alloys undergo crystallization over many years, resulting in changes in their magnetic properties. It has been pointed out that the magnetic properties of the amorphous alloy directly affect the leakage current measurement error in lightning arrester leakage current detection devices that use transformers that use this amorphous alloy as the iron core material. Therefore, it is particularly important to inspect changes in the characteristics of lightning arrester leakage current devices.
従来の避雷器漏れ電流検出装置では避雷器洩れ電流検出
装置そのものの特性の変化を検査するための配慮がされ
ていない、したがって実際の検査では、変流器５を接地
＆１１４から取り外して別の電流源から一次電流を供給
してこの一次電流と出力器１３で得られる電流とを比較
して、避雷器洩れ電流検出装置の特性が変化していない
ことを確認し、変化していると避雷器漏れ電流検出装置
を構成する部品のどれかが劣化して特性が変化している
ことを示していると考えて更に詳しく調べて劣化した部
品と特定し取り変えるなどの修理を行う。Conventional lightning arrester leakage current detection devices do not take into consideration changes in the characteristics of the lightning arrester leakage current detection device itself. Therefore, in actual inspection, the current transformer 5 must be removed from the ground &114 and connected to another current source. By supplying a primary current and comparing this primary current with the current obtained by the output device 13, it is confirmed that the characteristics of the lightning arrester leakage current detection device have not changed, and if they have changed, the characteristics of the lightning arrester leakage current detection device We believe that this indicates that one of the components has deteriorated and its characteristics have changed, so we investigate the problem in more detail, identify the deteriorated part, and perform repairs such as replacing it.
避雷器漏れ電流検出装置の特性を検査するために変圧器
を接地＆ｉ４から取り外すためには、接地ＡＩ４と同様
な太さの接地線４０を別に用意し、この接地ｍ４０を第
２図における点線のように変圧器５の貫通穴を貫通させ
ないで避雷器２を一旦接地した状態にし、接地線４の接
地導体への接続部を外して変圧器を取り出す必要がある
。この理由は、高圧＆９１１に電圧が印加されていると
きに避雷器２の接地を外すと、避雷器２の接地端子に高
電圧が誘起されるためであり、作業者の安全のために、
避雷器２の接地側を必ず接地状態にしておかねばならな
い。In order to remove the transformer from the ground &i4 in order to inspect the characteristics of the lightning arrester leakage current detection device, prepare a separate grounding wire 40 of the same thickness as the grounding AI4, and connect this grounding wire 40 as shown by the dotted line in Fig. 2. It is necessary to temporarily ground the lightning arrester 2 without passing through the through hole of the transformer 5, then disconnect the connection of the grounding wire 4 to the grounding conductor and take out the transformer. The reason for this is that if the grounding of the lightning arrester 2 is removed while voltage is being applied to the high voltage &911, a high voltage will be induced in the grounding terminal of the lightning arrester 2, and for the safety of the workers,
The ground side of the lightning arrester 2 must be grounded.
また、前述のように接地１１４はサージが侵入して避雷
器漏れ電流検出装置が動作したときに流れる大電流に対
して充分小さな接地抵抗となるように接地１４として断
面の大きいケーブルを使用し、接地導体との接続も充分
接触抵抗の小さい方式の接続構造が採用されているので
、取り外す作業も容易でない。In addition, as mentioned above, a cable with a large cross section is used as the grounding 114 so that the grounding resistance is sufficiently small against the large current that flows when a surge enters and the lightning arrester leakage current detection device is activated. Since the connection structure with the conductor has a sufficiently low contact resistance, it is not easy to remove it.
この発明は、変圧器を接地線から取り外すことなく、特
性の変化を容易に検査することのできる避雷器漏れ電流
検出装置を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a lightning arrester leakage current detection device that can easily inspect changes in characteristics without removing the transformer from the grounding wire.
上記課題を解決するために、この発明によれば、高圧線
に接続された避雷器の接地線を１ターンの一次巻線とし
た貫通型の変成器と、この変成器の二次巻線に誘起され
る電圧を増幅する増幅器と、前記高圧線に接続された分
圧器と、この分圧器の接地側インピーダンスの対地電圧
と前記増幅器の出力電圧とを人力信号とする差動増幅器
と、この差動増幅器の出力信号を表示する出力器とを備
えた避雷器漏れ電流検出装置において、前記変成器の鉄
心に巻回する１ターンの検査用巻線と、この検査用巻線
に所定の周波数の検査電流を供給する交流電源と、前記
増幅器の出力側に直列に接続し前記交流電源の周波数成
分を通すとともに前記避雷器漏れ電流の周波数成分をカ
ントする狭帯域フィルタと、この狭帯域フィルタを回路
から切り離す切換スイッチとを備えるものとする。In order to solve the above problems, the present invention provides a through-type transformer in which the ground wire of a lightning arrester connected to a high-voltage line is the primary winding of one turn, and a voltage divider connected to the high voltage line; a differential amplifier that uses the ground voltage of the ground impedance of the voltage divider and the output voltage of the amplifier as a human power signal; A lightning arrester leakage current detection device comprising an output device that displays an output signal of an amplifier, a one-turn test winding wound around the core of the transformer, and a test current of a predetermined frequency applied to the test winding. an alternating current power source that supplies the voltage, a narrow band filter that is connected in series to the output side of the amplifier and passes the frequency component of the alternating current power source while canting the frequency component of the lightning arrester leakage current, and a switch that disconnects the narrow band filter from the circuit. It shall be equipped with a switch.
この発明の構成において、貫通形の変圧器または変流器
としての変成器の鉄心に検査用巻線を巻回し、この避雷
器漏れ電流検出装置の特性の変化を検査する際にこの検
査用ｔ！線に所定の周波数の電流を供給する交流電源か
ら交流電流を供給すると、この電流は変成器の変成作用
によって二次巻線に電圧を誘起し、変流器の場合は一次
電流に比例した電流を二次側に出力しこの電流が負荷抵
抗に流れて一次電流に比例した電圧を発生し、変圧器の
場合は一次電流を時間微分した電圧が二次電圧として発
生する。この電圧は避雷器の漏れ電流を検出するときと
同じであり、周波数と波形が異なるだけである。前述の
交流電源が供給する電流の周波数成分だけを通す狭帯域
フィルタを回路に直列に挿入して漏れ電流成分をカット
し交流電源から供給した交流成分だけを通す、避雷器漏
れ電流検出装置が正常であれば狭帯域フィルタの出力信
号は検査用巻線の電流になる。避雷器漏れ電流検出装置
の一部に異常があって特性が変化していると、狭帯域フ
ィルタの出力信号は検査用巻線の電流と異なった値にな
るので、この違いを差動増幅器を利用するか、検査用巻
線に流す電流を電流計で計測し狭帯域フィルタの出力信
号を直接出力器で出力して両方の値を比較することによ
って避雷器漏れ電流検出装置の特性が正常か異常かを判
断することができる。In the configuration of the present invention, a testing winding is wound around the core of a transformer as a feed-through transformer or a current transformer, and the testing t! When an alternating current is supplied from an alternating current source that supplies current at a predetermined frequency to the line, this current induces a voltage in the secondary winding due to the transformation action of the transformer, and in the case of a current transformer, a current proportional to the primary current is output to the secondary side, and this current flows through a load resistor, generating a voltage proportional to the primary current.In the case of a transformer, the voltage obtained by differentiating the primary current with respect to time is generated as the secondary voltage. This voltage is the same as when detecting lightning arrester leakage current, only the frequency and waveform are different. The above-mentioned lightning arrester leakage current detection device, which cuts the leakage current component by inserting a narrow band filter in series in the circuit that only passes the frequency component of the current supplied by the AC power supply, and passes only the AC component supplied from the AC power supply, is normal. If so, the output signal of the narrowband filter becomes the current in the test winding. If there is an abnormality in a part of the lightning arrester leakage current detection device and the characteristics change, the output signal of the narrowband filter will have a value different from the current in the test winding.This difference can be detected using a differential amplifier. Alternatively, you can determine whether the characteristics of the lightning arrester leakage current detection device are normal or abnormal by measuring the current flowing through the test winding with an ammeter, outputting the output signal of the narrowband filter directly with the output device, and comparing both values. can be judged.
以下この発明を実施例に基づいて説明する。第１図はこ
の発明の実施例を示す回路構成図である。The present invention will be explained below based on examples. FIG. 1 is a circuit diagram showing an embodiment of the present invention.
この図において第２図と同じ構成体については同じ参照
符号を付けることにより詳しい説明を省略する。この図
は避雷器漏れ電流検出装置の特性を検査している状態の
回路構成を示している。変圧器５には検査用巻線６４が
巻回されている。この検査用巻線はこの変圧器５の一次
巻線である接地線４と同様に１ターンの巻線でよく、変
圧器の製作時に巻き込んで二次巻線とともに一体成形し
たものでもよいが、接地線４と同様に製品としての変圧
器とは別に設けたものでもよい、この検査用巻＆Ｉ６４
は交流電源６１によって電流計６２．スイッチ６３を介
して検査電流を供給する。交流電１［６１の周波数は高
圧線１の周波数より低くし、たとえば、高圧線１の周波
数が５０Ｈ２の場合は数Ｈｚ以下にする。In this figure, the same reference numerals are given to the same components as in FIG. 2, and detailed explanations thereof will be omitted. This figure shows the circuit configuration when the characteristics of the lightning arrester leakage current detection device are being tested. A test winding 64 is wound around the transformer 5 . This test winding may be a one-turn winding like the grounding wire 4 which is the primary winding of this transformer 5, or may be wound during the manufacture of the transformer and integrally formed with the secondary winding. Similar to the grounding wire 4, this test winding &I64 may be provided separately from the transformer as a product.
is the ammeter 62. by the AC power supply 61. A test current is supplied via switch 63. The frequency of the AC power 1 [61 is set lower than the frequency of the high voltage line 1, for example, when the frequency of the high voltage line 1 is 50H2, it is set to be several Hz or less.
スイッチ６３は特性の検査を行うときにのみ投入するも
のであり、常時は開放状態にしである。The switch 63 is turned on only when testing the characteristics, and is normally left open.
二次Ｓ＆Ｉ５１に接続される回路の積分器１１の出力側
に狭帯域フィルタ６６がスイッチ６７の切り換えによっ
て直列に投入されている。狭帯域フィルタ６６は検査電
流の周波数成分だけを通すものであり、漏れ電流には高
調波成分が含まれているから、これらを確実にカントす
るためには、検査電流の周波数を低い方に設定しておく
のがよい、この狭帯域フィルタ６６は演算増幅器、コン
デンサ、抵抗とを組み合わせて構成されるアクティブフ
ィルタである。A narrowband filter 66 is connected in series to the output side of the integrator 11 of the circuit connected to the secondary S&I 51 by switching a switch 67. The narrow band filter 66 passes only the frequency components of the test current, and since the leakage current includes harmonic components, in order to reliably cant these components, the frequency of the test current should be set to a lower value. Preferably, this narrow band filter 66 is an active filter constructed by combining an operational amplifier, a capacitor, and a resistor.
積分器１１の出力信号の中には避雷器の漏れ電流に相当
する成分と検査電流に相当する成分が重畳して含まれて
いるが、狭帯域フィルタ６６によって漏れ電流に相当す
る成分をカントするので差動増幅器１２の入力信号は検
査電流に相当する成分だけになっている。差動増幅器１
２のもう一つの入力信号である分圧器３の出力信号はス
イッチ６８によって遮断し、代わりに検査用巻！６４の
接地側端子に接続した直列抵抗６５の対地電圧をスイッ
チ６８の切換えにより差動増幅器１２の一方の入力信号
としている。直列抵抗６５の値は、避雷器漏れ電流検出
装置が正常の場合は差動増幅器１２０２つの入力信号が
丁度打ち消し合って差動増幅器１２の出力信号が零にな
るように調整しである。The output signal of the integrator 11 contains a superimposed component corresponding to the leakage current of the lightning arrester and a component corresponding to the test current, but since the component corresponding to the leakage current is canted by the narrow band filter 66. The input signal to the differential amplifier 12 consists only of components corresponding to the test current. Differential amplifier 1
The output signal of the voltage divider 3, which is another input signal of the voltage divider 3, is cut off by the switch 68 and is replaced by the test winding! The ground voltage of a series resistor 65 connected to the ground terminal of the differential amplifier 64 is set as one input signal of the differential amplifier 12 by switching the switch 68. The value of the series resistor 65 is adjusted so that when the lightning arrester leakage current detection device is normal, the two input signals of the differential amplifier 120 exactly cancel each other out, and the output signal of the differential amplifier 12 becomes zero.
鉄心５２の材料であるアモルファス合金が劣化して磁気
特性が低下すると狭帯域フィルタ６６の出力信号である
差動増幅器１２の一方の入力信号の強度が低下して直列
抵抗６５からの差動増幅器１２のもう一方の入力信号の
方が大きくなってこれらの差が差動増幅器１２の出力信
号として出力器１３で出力表示される。同じようにして
、増幅器１０の増幅率の変化、積分器１１．狭帯域フィ
ルタ６６などの特性の変化、あるいは二次巻線５１内で
の断線、短絡などの故障など、何らかの異常が発生して
いることの判る出力結果が得られることになる。When the amorphous alloy that is the material of the iron core 52 deteriorates and its magnetic properties deteriorate, the intensity of one input signal of the differential amplifier 12, which is the output signal of the narrowband filter 66, decreases, and the output signal from the series resistor 65 decreases. The other input signal becomes larger, and the difference between them is output and displayed by the output device 13 as an output signal of the differential amplifier 12. In the same way, changes in the amplification factor of amplifier 10, integrator 11 . An output result indicating that some abnormality has occurred, such as a change in the characteristics of the narrowband filter 66 or a failure such as a disconnection or short circuit within the secondary winding 51, is obtained.
直列抵抗６５を設けない検出方式も可能である。A detection method without providing the series resistor 65 is also possible.
すなわち、検査電流を電流計６２で計測し、一方、スイ
ッチ６８は直列抵抗６５の側も開放すると、差動増幅器
１２の出力信号は検査ｉｉ流に相当する成分に対応する
ものとなるので、装置が正常ならば出力器１３に表示さ
れる電流値は電流計６２の表示値と同じになる。異常が
あると、両者の電流値に差が生ずることになる。That is, when the test current is measured by the ammeter 62 and the switch 68 is also opened on the series resistor 65 side, the output signal of the differential amplifier 12 corresponds to the component corresponding to the test current II, so the device If the current value is normal, the current value displayed on the output device 13 will be the same as the value displayed on the ammeter 62. If there is an abnormality, a difference will occur between the two current values.
交流電源６１が発生する電流の波形を正弦波にすると、
非線型要素である避雷器の漏れ電流は狭帯域フィルタ６
６でカットされるので、検査時の回路を構成する要素は
全て線型要素となるので、波形が歪むことはないので、
積分器１１は単に位相を合わせるためのものになるので
、必ずしも必要ではない、したがって、積分器１１を使
用していない避雷器漏れ電流検出装置に対しては、直列
抵抗６５の代わりに適当な位相を持つインピーダンスう
使用することによりこの発明を適用することができる。If the waveform of the current generated by the AC power supply 61 is made into a sine wave,
The leakage current of the lightning arrester, which is a nonlinear element, is filtered by a narrow band filter 6.
Since it is cut at 6, the elements that make up the circuit during inspection are all linear elements, so the waveform will not be distorted.
The integrator 11 is simply used to match the phase, so it is not necessarily necessary. Therefore, for a lightning arrester leakage current detection device that does not use the integrator 11, an appropriate phase can be set in place of the series resistor 65. This invention can be applied by using the impedance that has.
更に、漏れ電流を検出するのにアモルファス合金を鉄心
材料にした変圧器ではな（、従来の変流器を使用した避
雷器漏れ電流検出装置の場合も、この変流器に検査用巻
線６４を設けてこの発明を適用することによって異常診
断を行うことができる。Furthermore, in order to detect leakage current, a transformer with an amorphous alloy core material is not used (and in the case of a lightning arrester leakage current detection device that uses a conventional current transformer, the test winding 64 is installed in this current transformer. By providing this and applying the present invention, abnormality diagnosis can be performed.
この場合、既設の変流器に検査用巻線を設けるには、接
地線４が貫通する貫通穴に検査用巻線としての電線を通
せばよく、これに使用する電線はせいぜい０．１Ａの小
電流を流すだけの細いものでよいこともあって容易なこ
とである。In this case, in order to install a test winding in the existing current transformer, it is sufficient to pass the wire as the test winding through the through hole through which the grounding wire 4 passes, and the wire used for this has a current capacity of at most 0.1A. This is easy because it only needs to be a thin device that allows a small current to flow through it.
この発明は前述のように、貫通形の変成器の鉄心に検査
用巻線を巻回しておき、この避雷器漏れ電流検出装置の
特性の変化を検査する際にこの検査用巻線に所定の周波
数の電流を供給する交流電源から交流電流を供給すると
、この検査電流は変成器の変成作用によって二次側に電
圧を発生する。As described above, in this invention, a test winding is wound around the iron core of a feed-through transformer, and a predetermined frequency is applied to the test winding when testing changes in the characteristics of the lightning arrester leakage current detection device. When an alternating current is supplied from an alternating current power supply that supplies a current of , this test current generates a voltage on the secondary side by the transformation action of the transformer.
この電圧は避雷器の漏れ電流を検出するときと同じであ
り、周波数と波形が異なるだけである。検査電流の周波
数成分だけを通す狭帯域フィルタを回路に直列に挿入し
て漏れ電流成分をカットし交流電源から供給した交流成
分だけを通すと、避雷器漏れ電流検出装置が正常であれ
ば狭帯域フィルタの出力信号は検査電流と同じ値になり
、避雷器漏れ電流検出装置の一部に異常があって特性が
変化していると、狭帯域フィルタの出力信号は検査用巻
線の電流と異なった値になるので、この違いを差動増幅
器にこれらに２つの電気信号を入力して差を出力器に表
示させるか、検査電流を電流計で計測し狭帯域フィルタ
の出力信号を直接出力器で出力して両方の値を比較する
ことによって避雷器漏れ電流検出装置の特性が正常か異
常かを判断することができる。This voltage is the same as when detecting lightning arrester leakage current, only the frequency and waveform are different. If a narrowband filter that passes only the frequency component of the test current is inserted in series in the circuit to cut the leakage current component and pass only the AC component supplied from the AC power supply, the narrowband filter will pass if the lightning arrester leakage current detection device is normal. The output signal of the narrowband filter will have the same value as the test current, but if there is an abnormality in a part of the lightning arrester leakage current detection device and the characteristics change, the output signal of the narrowband filter will have a value different from the test winding current. Therefore, this difference can be detected by inputting these two electrical signals to a differential amplifier and displaying the difference on the output device, or by measuring the test current with an ammeter and directly outputting the output signal of the narrow band filter on the output device. By comparing both values, it can be determined whether the characteristics of the lightning arrester leakage current detection device are normal or abnormal.
このような構成によって、単に小電流、低電圧回路のス
イッチを切り換えるだけで、避雷器漏れ電流検出装置の
特性を容易に検査することができる。したがって、避雷
器漏れ電流検出装置によって避雷器の劣化の程度を調べ
る際に、その前又は後に検査電流を流して避雷器漏れ電
流検出装置が正常に動作することを確認することにより
、信鯨性の高い避雷器劣化判定を行うことができる。変
成器を避雷器の接地線から取り外す作業が不要になるの
で、劣化判定のための作業を迅速に行うことができるよ
うになるとともに、接地線を取り外す際に接地線の電位
が上昇して感電事故が発生する可能性もな゛くなる。With such a configuration, the characteristics of the lightning arrester leakage current detection device can be easily tested by simply switching a switch in a small current, low voltage circuit. Therefore, when checking the degree of deterioration of a lightning arrester using a lightning arrester leakage current detection device, by applying a test current before or after checking that the lightning arrester leakage current detection device operates normally, it is possible to improve the reliability of the lightning arrester. Deterioration can be determined. Since there is no need to remove the transformer from the grounding wire of the lightning arrester, work to determine deterioration can be carried out quickly, and the potential of the grounding wire increases when removing the grounding wire, which can lead to electric shock accidents. The possibility of this occurring also decreases.
第１図はこの発明の実施例を示すブロック回路図、第２
図は従来技術のブロック回路図、第３図は漏れ電流説明
のための波形図である。
１：高圧線、２：避雷器、３：分圧器、４．４０ ：接
地線、５：変圧器（変成器）、５１：二次巻線、５２：
鉄心、１０：増幅器、１１：積分器、１２：差動増幅器
、１３：出力器、６１：交流電源、６５：直列抵抗。
６６：狭帯域フィルタ、６３．６７．６８ ：スイッチ
。
名３図FIG. 1 is a block circuit diagram showing an embodiment of the present invention, and FIG.
The figure is a block circuit diagram of the prior art, and FIG. 3 is a waveform diagram for explaining leakage current. 1: High voltage line, 2: Lightning arrester, 3: Voltage divider, 4.40: Grounding wire, 5: Transformer (transformer), 51: Secondary winding, 52:
Iron core, 10: amplifier, 11: integrator, 12: differential amplifier, 13: output device, 61: AC power supply, 65: series resistor. 66: Narrowband filter, 63.67.68: Switch. Name 3 figure
Claims (1)
次巻線とした貫通型の変成器と、この変成器の二次巻線
に誘起される電圧を増幅する増幅器と、前記高圧線に接
続された分圧器と、この分圧器の接地側インピーダンス
の対地電圧と前記増幅器の出力電圧とを入力信号とする
差動増幅器と、この差動増幅器の出力信号を表示する出
力器とを備えた避雷器漏れ電流検出装置において、前記
変成器の鉄心に巻回する１ターンの検査用巻線と、この
検査用巻線に所定の周波数の検査電流を供給する交流電
源と、前記増幅器の出力側に直列に接続し前記交流電源
の周波数成分を通すとともに前記避雷器漏れ電流の周波
数成分をカットする狭帯域フィルタと、この狭帯域フィ
ルタを回路から切り離す切換スイッチとを備えたことを
特徴とする避雷器漏れ電流検出装置。1) A feed-through transformer whose primary winding is the ground wire of a lightning arrester connected to a high-voltage line, an amplifier that amplifies the voltage induced in the secondary winding of this transformer, and the high-voltage line. a voltage divider connected to the voltage divider, a differential amplifier that receives as input signals the ground voltage of the ground side impedance of the voltage divider and the output voltage of the amplifier, and an output device that displays the output signal of the differential amplifier. A lightning arrester leakage current detection device comprising: a one-turn test winding wound around the iron core of the transformer; an AC power supply supplying a test current of a predetermined frequency to the test winding; and an output side of the amplifier. A lightning arrester leakage characterized by comprising: a narrowband filter connected in series to pass the frequency component of the alternating current power supply and cut the frequency component of the lightning arrester leakage current; and a changeover switch that disconnects the narrowband filter from the circuit. Current detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3531590A JPH031476A (en) | 1989-02-16 | 1990-02-16 | Sensing device for leak current of lightning arrester |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3715389 | 1989-02-16 | ||
| JP1-37153 | 1989-02-16 | ||
| JP3531590A JPH031476A (en) | 1989-02-16 | 1990-02-16 | Sensing device for leak current of lightning arrester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH031476A true JPH031476A (en) | 1991-01-08 |
Family
ID=26374290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3531590A Pending JPH031476A (en) | 1989-02-16 | 1990-02-16 | Sensing device for leak current of lightning arrester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH031476A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031931A1 (en) * | 2003-09-25 | 2005-04-07 | Siemens Aktiengesellschaft | Device for supervising a leakage current of a lighting arrester |
| EP2392934A1 (en) * | 2010-06-02 | 2011-12-07 | Omicron electronics GmbH | Method and device for surveillance of a sheath voltage arrester of a cable system |
-
1990
- 1990-02-16 JP JP3531590A patent/JPH031476A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031931A1 (en) * | 2003-09-25 | 2005-04-07 | Siemens Aktiengesellschaft | Device for supervising a leakage current of a lighting arrester |
| US7336193B2 (en) | 2003-09-25 | 2008-02-26 | Siemens Aktiengesellschaft | Device for monitoring the leakage current of a surge arrester |
| EP2392934A1 (en) * | 2010-06-02 | 2011-12-07 | Omicron electronics GmbH | Method and device for surveillance of a sheath voltage arrester of a cable system |
| US9146268B2 (en) | 2010-06-02 | 2015-09-29 | Omicron Electronics Gmbh | Method and device for monitoring a sheath voltage arrester of a cable system |
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