JP2016158445A - Deterioration monitoring device for surge protection element - Google Patents

Deterioration monitoring device for surge protection element Download PDF

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JP2016158445A
JP2016158445A JP2015036306A JP2015036306A JP2016158445A JP 2016158445 A JP2016158445 A JP 2016158445A JP 2015036306 A JP2015036306 A JP 2015036306A JP 2015036306 A JP2015036306 A JP 2015036306A JP 2016158445 A JP2016158445 A JP 2016158445A
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protection element
surge protection
eddy current
deterioration
surge
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JP6412444B2 (en
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圭吾 見澤
Keigo Misawa
圭吾 見澤
林　智仁
Tomohito Hayashi
智仁 林
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Azbil Corp
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Abstract

PROBLEM TO BE SOLVED: To easily monitor deterioration of a surge protection element in simple circuit configuration and with a little power.SOLUTION: Between lines L1 and L2 to a circuit 1 to be protected, a direct connection circuit of a varistor 2 and a coil 4 is connected in parallel to the circuit 1 to be protected, and a conductor 5 is disposed in the vicinity of the coil 4. The coil 4 generates a magnetic field by receiving supply of a current that flows via the variator 2. An eddy current is generated in the conductor 5 by the magnetic field that is generated by the coil 4. A magnitude of the eddy current generated in the conductor 5 is detected by an eddy current detection part 6 and sent to a deterioration decision degree discrimination part 7. Based on the magnitude of the eddy current detected by the eddy current detection part 6, the deterioration decision degree discrimination part 7 integrates how many times a surge current flows to the variator 2, discriminates a degree of deterioration of the variator 2 from the integrated number of times and sends a discriminated result to a discrimination result notification part 8.SELECTED DRAWING: Figure 1

Description

この発明は、被保護回路へのサージ電流の侵入を防止するサージ保護素子の劣化の度合いを監視するサージ保護素子の劣化監視装置に関するものである。   The present invention relates to a deterioration monitoring device for a surge protection element that monitors the degree of deterioration of a surge protection element that prevents a surge current from entering a protected circuit.

従来より、プラントのプロセス制御などで使用している電子システムでは、電源配線や通信線路などの線路を伝わって機器内に侵入しようとするサージ電流から機器内の電子回路を保護するために、線路にサージ保護素子を設けている。すなわち、電源配線や通信線路などの線路にサージ保護素子を設けることによって、機器内の電子回路（被保護回路）へのサージ電流の侵入を防止するようにしている。   Conventionally, in an electronic system used for process control of a plant, in order to protect an electronic circuit in a device from a surge current that tries to enter the device through a line such as a power supply wiring or a communication line, Is provided with a surge protection element. That is, by providing a surge protection element in a line such as a power supply line or a communication line, entry of a surge current into an electronic circuit (protected circuit) in the device is prevented.

図４にサージ保護素子としてバリスタを用いた例を示す。同図において、１は被保護回路、２はバリスタであり、被保護回路１への線路Ｌ１，Ｌ２間に被保護回路１に対して並列にバリスタ２を接続している。３はインパルス性のノイズ電圧を示し、Ｚ0はノイズ発生源の内部抵抗やラインインピーダンスを示す。 FIG. 4 shows an example using a varistor as a surge protection element. In the figure, reference numeral 1 denotes a protected circuit, and 2 denotes a varistor, and a varistor 2 is connected in parallel to the protected circuit 1 between lines L1 and L2 to the protected circuit 1. 3 represents an impulsive noise voltage, and Z 0 represents the internal resistance and line impedance of the noise generation source.

図５にバリスタ２の電圧−電流特性を示す。バリスタ２は、両端子間の電圧が低い場合には電気抵抗が高いが、ある程度以上に電圧が高くなると急激に電気抵抗が低くなる性質を持つ。この急激に電気抵抗が低くなる点の電圧をバリスタ電圧と呼ぶ。   FIG. 5 shows the voltage-current characteristics of the varistor 2. The varistor 2 has a high electrical resistance when the voltage between the two terminals is low, but has a property that the electrical resistance rapidly decreases when the voltage becomes higher than a certain level. The voltage at which the electric resistance rapidly decreases is called a varistor voltage.

図４に示した回路は、ノイズ電圧３がバリスタ電圧以下のときには、図６に示すような回路として表される。これに対して、ノイズ電圧３がバリスタ電圧を超えたときには、図７に示すような回路として表され、バリスタ２にサージ電流が流れることにより、被保護回路１へのサージ電流の侵入が防がれる。   The circuit shown in FIG. 4 is represented as a circuit shown in FIG. 6 when the noise voltage 3 is equal to or lower than the varistor voltage. On the other hand, when the noise voltage 3 exceeds the varistor voltage, it is represented as a circuit as shown in FIG. 7, and a surge current flows through the varistor 2, thereby preventing the surge current from entering the protected circuit 1. It is.

バリスタなどのサージ保護素子は、その動作原理上、サージ電流が流れる度に劣化する。例えば、酸化亜鉛（ＺｎＯ）バリスタは、主成分を酸化亜鉛とし、この酸化亜鉛に数種類の添加物質を加え、焼成して造られる。酸化亜鉛（ＺｎＯ）バリスタでは、１つのＺｎＯ結晶粒当たり約３Ｖの立ち上がり電圧（バリスタ電圧）が得られる。なお、酸化亜鉛（ＺｎＯ）バリスタは、図８に示すように、ＺｎＯ結晶粒がブロック状に結合している構造とされており、直列に積み上げることでバリスタ電圧を制御できる。また、電極間の面積を変えることで、サージ電流耐量を制御できる。   A surge protection element such as a varistor deteriorates every time a surge current flows due to its operating principle. For example, a zinc oxide (ZnO) varistor is made by making zinc oxide as a main component, adding several kinds of additive substances to the zinc oxide, and baking it. With a zinc oxide (ZnO) varistor, a rising voltage (varistor voltage) of about 3 V per ZnO crystal grain is obtained. As shown in FIG. 8, the zinc oxide (ZnO) varistor has a structure in which ZnO crystal grains are combined in a block shape, and the varistor voltage can be controlled by stacking them in series. Further, the surge current resistance can be controlled by changing the area between the electrodes.

ＺｎＯバリスタは、その構造上、バリスタ電圧の低下と漏れ電流の増加が起こるため、サージ電流が繰り返し流れると、劣化が進む。これは、サージ電流のエネルギーにより境界（高抵抗）層の弱い部分が徐々に破壊（短絡）されて行くためである。ＺｎＯバリスタにおいて、劣化が進むと、最終的には電極間が短絡状態になる。ダイオードについても、過大な電流が加わると、接合部が局所的に発熱する。これにより、接合部が融解し、短絡状態となる。   A ZnO varistor has a structure in which the varistor voltage decreases and the leakage current increases, so that the deterioration progresses when a surge current repeatedly flows. This is because the weak part of the boundary (high resistance) layer is gradually destroyed (short-circuited) by the energy of the surge current. When the ZnO varistor deteriorates, the electrodes are eventually short-circuited. As for the diode, when an excessive current is applied, the junction portion locally generates heat. Thereby, a junction part melt | dissolves and it will be in a short circuit state.

サージ保護素子は、劣化が進む度に、電流が流れ易くなる。劣化が進み短絡状態で大電流が流れると、短絡状態のサージ保護素子は溶融破損し、絶縁状態となる。この絶縁状態でサージ電流が発生した場合、そのサージ電流は全て被保護回路に流れるため、回路保護が達成できなくなる。   The surge protection element is more likely to cause current to flow each time the deterioration progresses. When deterioration progresses and a large current flows in a short-circuited state, the surge protection element in the short-circuited state is melted and broken and becomes insulative. When a surge current is generated in this insulated state, all the surge current flows through the protected circuit, so that circuit protection cannot be achieved.

サージ保護素子が破壊した場合に、それを回路から切り離すように、ヒューズを直列に入れる例もある（例えば、非特許文献１参照）。しかし、サージ保護素子が回路から切り離された状態でサージ電流が流れれば、上記と同様に、そのサージ電流が全て被保護回路に流れるため、回路保護が達成できなくなる。また、ヒューズが断線するまで劣化の度合いが不明である。   There is also an example in which a fuse is inserted in series so that when the surge protection element is broken, it is disconnected from the circuit (for example, see Non-Patent Document 1). However, if a surge current flows in a state where the surge protection element is disconnected from the circuit, all of the surge current flows to the protected circuit as described above, and thus circuit protection cannot be achieved. Further, the degree of deterioration is unknown until the fuse is disconnected.

このために、サージ保護素子の劣化の度合いを監視する必要性が生じ、サージ保護素子の劣化を監視する装置として種々の提案がなされている。例えば、特許文献１では、サージ吸収素子をギャップ式の放電管と非直線抵抗体とで構成し、ギャップ式の放電管に対向して放電光を検出する受光素子を設け、受光素子の検出信号をカウント（サージ侵入回数をカウント）するようにしている。また、特許文献２では、バリスタと接地端子との間に放電ギャップを有するガスアレスタを接続し、このガスアレスタの放電時の発光をフォトトランジスタで検知するようにし、ガスアレスタの発光時間に基づいてバリスタの劣化を判定するようにしている。   For this reason, it becomes necessary to monitor the degree of deterioration of the surge protection element, and various proposals have been made as apparatuses for monitoring the deterioration of the surge protection element. For example, in Patent Document 1, a surge absorbing element is composed of a gap type discharge tube and a non-linear resistor, a light receiving element for detecting discharge light is provided opposite to the gap type discharge tube, and a detection signal of the light receiving element is provided. Is counted (the number of surge intrusions is counted). Further, in Patent Document 2, a gas arrester having a discharge gap is connected between a varistor and a ground terminal, and light emission at the time of discharge of the gas arrester is detected by a phototransistor. Based on the light emission time of the gas arrester. The deterioration of the varistor is judged.

特開平０５−０８９９３８号公報Japanese Patent Laid-Open No. 05-089938 特開２０１２−１０４５９８号公報JP 2012-104598 A

発明協会公開技報２００２−５００６３６号Japan Society of Invention and Innovation Open Technical Report 2002-200266

しかしながら、特許文献１に示された方式では放電管と受光素子とを必要とし、また特許文献２に示された方式ではガスアレスタとフォトトランジスタとを必要とし、回路の構成が複雑となる。また、回路電力を消費し易い。   However, the method disclosed in Patent Document 1 requires a discharge tube and a light receiving element, and the method disclosed in Patent Document 2 requires a gas arrester and a phototransistor, resulting in a complicated circuit configuration. In addition, it is easy to consume circuit power.

なお、他の例として、サージ保護素子の漏れ電流を検知する方式もある。しかし、サージ保護素子の漏れ電流は僅かな値（μＡレベル）であるため、被保護回路からサージ保護素子を外し、専用の機器で測定しなくては分からない。   As another example, there is a method for detecting the leakage current of the surge protection element. However, since the leakage current of the surge protection element is a small value (μA level), it is not known unless the surge protection element is removed from the protected circuit and measured with a dedicated device.

本発明は、このような課題を解決するためになされたもので、その目的とするところは、簡単な回路構成で、かつ少ない電力で、簡易にサージ保護素子の劣化を監視することが可能なサージ保護素子の劣化監視装置を提供することにある。   The present invention has been made to solve such problems, and the object of the present invention is to easily monitor the deterioration of the surge protection element with a simple circuit configuration and a small amount of power. An object of the present invention is to provide a deterioration monitoring device for a surge protection element.

このような目的を達成するために本発明は、被保護回路へのサージ電流の侵入を防止するサージ保護素子の劣化の度合いを監視するサージ保護素子の劣化監視装置において、サージ保護素子と直列に接続され、サージ保護素子を通して流れるサージ電流の供給を受けて磁界を発生するコイルと、コイルの近傍に配置され、コイルが発生する磁界によって渦電流が生じる導電体と、導電体に生じる渦電流の大きさを検出する渦電流検出部と、渦電流検出部によって検出された渦電流の大きさに基づいて、サージ保護素子にサージ電流が流れた回数を積算し、その積算した回数に基づいてサージ保護素子の劣化の度合いを判定する劣化度合い判定部とを備えることを特徴とする。   In order to achieve such an object, the present invention provides a deterioration monitoring device for a surge protection element that monitors the degree of deterioration of the surge protection element that prevents the surge current from entering the protected circuit. A coil that is connected and generates a magnetic field by receiving a surge current supplied through the surge protection element, a conductor that is disposed near the coil and generates an eddy current due to the magnetic field generated by the coil, and an eddy current generated in the conductor; Based on the eddy current detection unit that detects the magnitude, and the magnitude of the eddy current detected by the eddy current detection unit, the number of times the surge current flows through the surge protection element is integrated, and the surge is detected based on the integrated number. It is provided with the deterioration degree determination part which determines the degree of deterioration of a protection element.

この発明において、サージ保護素子にサージ電流が流れると、このサージ保護素子を通して流れるサージ電流の供給を受けてコイルが磁界を発生する。そして、このコイルが発生する磁界によって導電体に渦電流が生じ、この導電体に生じる渦電流の大きさが渦電流検出部によって検出される。渦電流の大きさは、その渦電流によって生じる電圧の値として検出することが可能である。そして、この渦電流検出部によって検出された渦電流の大きさに基づいて、サージ保護素子にサージ電流が流れた回数が積算され、その積算された回数に基づいてサージ保護素子の劣化の度合いが判定される。   In the present invention, when a surge current flows through the surge protection element, the coil generates a magnetic field in response to the supply of the surge current flowing through the surge protection element. An eddy current is generated in the conductor by the magnetic field generated by the coil, and the magnitude of the eddy current generated in the conductor is detected by the eddy current detector. The magnitude of the eddy current can be detected as a voltage value generated by the eddy current. Based on the magnitude of the eddy current detected by the eddy current detector, the number of times the surge current has flowed through the surge protection element is integrated, and the degree of deterioration of the surge protection element is determined based on the integrated number. Determined.

例えば、本発明では、渦電流検出部によって検出された渦電流の大きさが所定の閾値を超えた直後に再び所定の閾値以内に収まった時を１回として、サージ保護素子にサージ電流が流れた回数を積算し、この積算した回数がサージ保護素子に対して定められている使用可能な限界値に達したときをサージ保護素子の寿命がつきたと判定するようにする。   For example, in the present invention, when the magnitude of the eddy current detected by the eddy current detection unit exceeds the predetermined threshold value and falls within the predetermined threshold value once, the surge current flows through the surge protection element. When the accumulated number reaches the usable limit value defined for the surge protection element, it is determined that the life of the surge protection element has been reached.

このような構成とすることにより、本発明では、放電時の発光を検出する方式と比較して回路構成が簡単となる。また、コイルが発生する磁界によって生じる渦電流を利用するので、電力の消費も少なくなる。また、サージ保護素子の漏れ電流よりも大きな値として得られる渦電流を利用するので、被保護回路に対してサージ保護素子を取り付けたままでの劣化の監視が可能である。   By adopting such a configuration, in the present invention, the circuit configuration is simplified as compared with a method of detecting light emission during discharge. Further, since eddy current generated by the magnetic field generated by the coil is used, power consumption is reduced. In addition, since an eddy current obtained as a value larger than the leakage current of the surge protection element is used, it is possible to monitor deterioration with the surge protection element attached to the protected circuit.

本発明において、コイルと導電体とは、所定の距離を保って絶縁部材によって覆うようにするとよい。これにより、コイルと導電体との間の距離が保たれ、コイルが発生する磁界を導電体に確実に作用させることが可能となる。また、コイルと導電体とを覆う絶縁部材を金属シールドで覆うようにするとよい。これにより、外部からの磁気の影響を防ぐことも可能となる。   In the present invention, the coil and the conductor may be covered with an insulating member while maintaining a predetermined distance. Thereby, the distance between the coil and the conductor is maintained, and the magnetic field generated by the coil can be reliably applied to the conductor. Moreover, it is good to cover the insulating member which covers a coil and a conductor with a metal shield. This also makes it possible to prevent the influence of magnetism from the outside.

本発明によれば、サージ保護素子を通して流れるサージ電流をコイルに供給し、このコイルが発生する磁界によって導電体に渦電流を生じさせ、この導電体に生じる渦電流の大きさに基づいてサージ保護素子にサージ電流が流れた回数を積算し、その積算した回数に基づいてサージ保護素子の劣化の度合いを判定するようにしたので、簡単な回路構成で、かつ少ない電力で、簡易にサージ保護素子の劣化を監視することが可能となる。   According to the present invention, a surge current flowing through a surge protection element is supplied to a coil, an eddy current is generated in a conductor by a magnetic field generated by the coil, and surge protection is performed based on the magnitude of the eddy current generated in the conductor. Since the number of surge currents flowing through the element is integrated and the degree of deterioration of the surge protection element is determined based on the accumulated number, the surge protection element can be easily configured with a simple circuit configuration and low power consumption. It is possible to monitor the deterioration of the battery.

本発明に係るサージ保護素子の劣化監視装置の一実施の形態の要部を示す図である。It is a figure which shows the principal part of one Embodiment of the deterioration monitoring apparatus of the surge protection element which concerns on this invention. コイルと導電体とを樹脂（絶縁部材）でモールドするようにした例を示す図である。It is a figure which shows the example which molded the coil and the conductor with resin (insulating member). コイルと導電体とを覆う樹脂（絶縁部材）を金属シールドで覆うようにした例を示す図である。It is a figure which shows the example which covered the resin (insulating member) which covers a coil and a conductor with a metal shield. 被保護回路へのサージ電流の侵入を防止するサージ保護素子としてバリスタを用いた例を示す図である。It is a figure which shows the example which used the varistor as a surge protection element which prevents the penetration | invasion of the surge current to a to-be-protected circuit. バリスタの電圧−電流特性を示す図である。It is a figure which shows the voltage-current characteristic of a varistor. ノイズ電圧がバリスタ電圧以下のときの状態を表した図である。It is a figure showing the state when a noise voltage is below a varistor voltage. ノイズ電圧がバリスタ電圧を超えたときの状態を表した図である。It is a figure showing the state when a noise voltage exceeds a varistor voltage. バリスタの構造模式図である。It is a structural schematic diagram of a varistor.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明に係るサージ保護素子の劣化監視装置の一実施の形態の要部を示す図である。同図において、図４と同一符号は図４を参照して説明した構成要素と同一或いは同等の構成要素を示し、その説明は省略する。   FIG. 1 is a diagram showing a main part of an embodiment of a deterioration monitoring device for a surge protection element according to the present invention. 4, the same reference numerals as those in FIG. 4 denote the same or equivalent components as those described with reference to FIG.

この実施の形態では、被保護回路１への線路Ｌ１，Ｌ２間に、被保護回路１に対して並列にバリスタ２とコイル４との直接接続回路を接続し、コイル４の近傍に導電体５を配置している。   In this embodiment, a direct connection circuit of a varistor 2 and a coil 4 is connected in parallel to the protected circuit 1 between the lines L1 and L2 to the protected circuit 1, and a conductor 5 is provided in the vicinity of the coil 4. Is arranged.

また、導電体５に生じる渦電流の大きさを渦電流検出部６によって検出し、劣化判定度合い判定部７へ送り、この劣化判定度合い判定部７での判定結果を判定結果報知部８へ送るようにしている。   The magnitude of the eddy current generated in the conductor 5 is detected by the eddy current detection unit 6 and sent to the deterioration determination degree determination unit 7, and the determination result in the deterioration determination degree determination unit 7 is sent to the determination result notification unit 8. I am doing so.

渦電流検出部６や劣化度合い判定部７などは、プロセッサや記憶装置からなるハードウェアと、これらのハードウェアと協働して各種機能を実現させるプログラムとによって実現される。   The eddy current detection unit 6 and the deterioration degree determination unit 7 are realized by hardware including a processor and a storage device and a program that realizes various functions in cooperation with these hardware.

このサージ保護素子の劣化監視装置では、線路Ｌ１，Ｌ２間にノイズ電圧ＮＺが印加されると、被保護回路１へ侵入しようとするサージ電流がバリスタ２を通してコイル４に流れ、コイル４が磁界を発生する。   In this surge protection element deterioration monitoring device, when a noise voltage NZ is applied between the lines L1 and L2, a surge current that attempts to enter the protected circuit 1 flows to the coil 4 through the varistor 2, and the coil 4 generates a magnetic field. Occur.

コイル４が磁界を発生すると、このコイル４が発生する磁界によって、コイル４の近傍に配置されている導電体５に渦電流が流れる。この導電体５に流れる渦電流の大きさは、渦電流検出部６によって検出される。この場合、渦電流検出部６は、導電体５に流れる渦電流の大きさを、この渦電流によって生じる電圧の値として検出する。   When the coil 4 generates a magnetic field, an eddy current flows through the conductor 5 disposed in the vicinity of the coil 4 due to the magnetic field generated by the coil 4. The magnitude of the eddy current flowing through the conductor 5 is detected by the eddy current detector 6. In this case, the eddy current detector 6 detects the magnitude of the eddy current flowing through the conductor 5 as the value of the voltage generated by this eddy current.

渦電流検出部６によって検出された渦電流の大きさは劣化度合い判定部７へ送られる。劣化度合い判定部７は、渦電流検出部６によって検出された渦電流の大きさが所定の閾値ｔｈを超えた直後に再び所定の閾値ｔｈ以内に収まった時を１回として、バリスタ２にサージ電流が流れた回数を積算する。   The magnitude of the eddy current detected by the eddy current detection unit 6 is sent to the deterioration degree determination unit 7. The deterioration degree determination unit 7 applies a surge to the varistor 2 once when the magnitude of the eddy current detected by the eddy current detection unit 6 falls within the predetermined threshold th immediately after exceeding the predetermined threshold th. Accumulate the number of times the current flows.

そして、劣化度合い判定部７は、バリスタ２にサージ電流が流れた回数の積算値（積算回数）をＮとし、この積算回数Ｎとバリスタ２に対して使用可能な積算回数の限界値として定められているＮｍａｘとを比較し、積算回数Ｎが限界値Ｎｍａｘに達したときをバリスタ２に寿命がつきたと判定する。この劣化度合い判定部７での判定結果は判定結果報知部８へ送られる。   The deterioration degree determination unit 7 sets N as the integrated value (the integrated number) of the number of times the surge current has flowed through the varistor 2, and is defined as the limit value of the integrated number that can be used for the integrated number N and the varistor 2. It is determined that the life of the varistor 2 has been reached when the cumulative number N reaches the limit value Nmax. The determination result in the deterioration degree determination unit 7 is sent to the determination result notification unit 8.

判定結果報知部８は、劣化度合い判定部７からの判定結果を受けて、その判定結果を保守員などに知らせる。例えば、バリスタ２に寿命がつきたとする判定結果を受けて、ＬＥＤ（Light Emitting Diode）を点灯したり、ＬＣＤ（ Liquid Crystal Display）に寿命がつきた旨のメッセージを表示したり、ブザーを鳴動させたりする。   The determination result notification unit 8 receives the determination result from the deterioration degree determination unit 7 and notifies the determination result to a maintenance staff or the like. For example, in response to the judgment result that the varistor 2 has reached the end of its life, the LED (Light Emitting Diode) is turned on, the LCD (Liquid Crystal Display) displays a message that the end of life is reached, or the buzzer is sounded. Or

保守員は、判定結果報知部８からの知らせを受けることにより、バリスタ２が寿命に到達しているか否かを即座に確認することができる。そして、バリスタ２が寿命に到達している場合には、例えば、その場でバリスタ２の交換作業を行ったり、メーカ等に交換を依頼したりする。   The maintenance staff can immediately confirm whether or not the varistor 2 has reached the end of its life by receiving the notification from the determination result notification unit 8. When the varistor 2 has reached the end of its life, for example, the varistor 2 is replaced on the spot, or the manufacturer is requested to replace it.

以上の説明から分かるように、本実施の形態のサージ保護素子の劣化監視装置によれば、バリスタ２にコイル４を直列に接続し、コイル４の近傍に導電体５を配置するのみでよく、放電時の発光を検出する方式と比較して回路構成が簡単となる。また、コイル４が発生する磁界によって生じる渦電流を利用するので、電力の消費も少なくなる。また、バリスタ２の漏れ電流よりも大きな値として得られる渦電流を利用するので、被保護回路１に対してバリスタ２を取り付けたままでの劣化の監視が可能となる。   As can be seen from the above description, according to the deterioration monitoring device for a surge protection element of the present embodiment, it is only necessary to connect the coil 4 to the varistor 2 in series and arrange the conductor 5 in the vicinity of the coil 4. The circuit configuration is simple compared to a method for detecting light emission during discharge. In addition, since eddy current generated by the magnetic field generated by the coil 4 is used, power consumption is reduced. In addition, since an eddy current obtained as a value larger than the leakage current of the varistor 2 is used, it is possible to monitor deterioration with the varistor 2 attached to the circuit 1 to be protected.

なお、上述した実施の形態では、コイル４の近傍に導電体５を単に配置するものとしたが、図２に示すように、コイル４と導電体５とを樹脂（絶縁部材）９でモールドするようにし、コイル４と導電体５との間の距離を所定の距離Ｌに保つようにしてもよい。これにより、コイル４と導電体５との間の距離が保たれ、コイル４が発生する磁界を導電体５に確実に作用させることが可能となる。   In the above-described embodiment, the conductor 5 is simply arranged in the vicinity of the coil 4. However, as shown in FIG. 2, the coil 4 and the conductor 5 are molded with a resin (insulating member) 9. In this way, the distance between the coil 4 and the conductor 5 may be kept at a predetermined distance L. Thereby, the distance between the coil 4 and the conductor 5 is maintained, and the magnetic field generated by the coil 4 can be reliably applied to the conductor 5.

また、図３に示すように、図２に示した構成において、さらに、コイル４と導電体５とを覆う樹脂（絶縁部材）９を金属シールド１０で覆うようにすると、外部からの磁界の影響を防ぐことも可能となる。   In addition, as shown in FIG. 3, if the resin (insulating member) 9 that covers the coil 4 and the conductor 5 is further covered with the metal shield 10 in the configuration shown in FIG. It is also possible to prevent this.

〔実施の形態の拡張〕
以上、実施の形態を参照して本発明を説明したが、本発明は上記の実施の形態に限定されるものではない。本発明の構成や詳細には、本発明の技術思想の範囲内で当業者が理解し得る様々な変更をすることができる。 [Extension of the embodiment]
The present invention has been described above with reference to the embodiment. However, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention.

１…被保護回路、２…バリスタ、４…コイル、５…導電体、６…渦電流検出部、７…劣化度合い判定部、８…判定結果報知部、９…樹脂（絶縁部材）、１０…金属シールド、Ｌ１，Ｌ２…線路、ＮＺ…ノイズ電圧。   DESCRIPTION OF SYMBOLS 1 ... Circuit to be protected, 2 ... Varistor, 4 ... Coil, 5 ... Conductor, 6 ... Eddy current detection part, 7 ... Deterioration degree determination part, 8 ... Determination result alerting part, 9 ... Resin (insulating member), 10 ... Metal shield, L1, L2 ... lines, NZ ... noise voltage.

Claims (5)

被保護回路へのサージ電流の侵入を防止するサージ保護素子の劣化の度合いを監視するサージ保護素子の劣化監視装置において、
前記サージ保護素子と直列に接続され、前記サージ保護素子を通して流れるサージ電流の供給を受けて磁界を発生するコイルと、
前記コイルの近傍に配置され、前記コイルが発生する磁界によって渦電流が生じる導電体と、
前記導電体に生じる渦電流の大きさを検出する渦電流検出部と、
前記渦電流検出部によって検出された渦電流の大きさに基づいて、前記サージ保護素子にサージ電流が流れた回数を積算し、その積算した回数に基づいて前記サージ保護素子の劣化の度合いを判定する劣化度合い判定部と
を備えることを特徴とするサージ保護素子の劣化監視装置。 In the surge protection element degradation monitoring device that monitors the degree of degradation of the surge protection element that prevents the surge current from entering the protected circuit,
A coil that is connected in series with the surge protection element and receives a supply of surge current flowing through the surge protection element to generate a magnetic field;
A conductor disposed in the vicinity of the coil and generating an eddy current by a magnetic field generated by the coil;
An eddy current detector for detecting the magnitude of eddy current generated in the conductor;
Based on the magnitude of the eddy current detected by the eddy current detector, the number of times the surge current has flowed through the surge protection element is integrated, and the degree of deterioration of the surge protection element is determined based on the integrated number of times. A deterioration monitoring device for a surge protection element, comprising: 請求項１に記載されたサージ保護素子の劣化監視装置において、
前記コイルと前記導電体とは、所定の距離を保って絶縁部材によって覆われている
ことを特徴とするサージ保護素子の劣化監視装置。 In the deterioration monitoring device for a surge protection element according to claim 1,
The deterioration monitoring device for a surge protection element, wherein the coil and the conductor are covered with an insulating member while maintaining a predetermined distance. 請求項２に記載されたサージ保護素子の劣化監視装置において、
前記コイルと前記導電体とを覆う絶縁部材は、さらに金属シールドで覆われている
ことを特徴とするサージ保護素子の劣化監視装置。 In the deterioration monitoring device for the surge protection element according to claim 2,
The insulation member for covering the coil and the conductor is further covered with a metal shield. 請求項１に記載されたサージ保護素子の劣化監視装置において、
前記劣化度合い判定部は、
前記渦電流検出部によって検出された渦電流の大きさが所定の閾値を超えた直後に再び所定の閾値以内に収まった時を１回として、前記サージ保護素子にサージ電流が流れた回数を積算する
ことを特徴とするサージ保護素子の劣化監視装置。 In the deterioration monitoring device for a surge protection element according to claim 1,
The deterioration degree determination unit
The number of times surge current flows through the surge protection element is counted once when the magnitude of the eddy current detected by the eddy current detection unit falls within the predetermined threshold again immediately after exceeding the predetermined threshold. A deterioration monitoring device for a surge protection element, characterized by: 請求項１に記載されたサージ保護素子の劣化監視装置において、
前記劣化度合い判定部は、
前記積算した回数が前記サージ保護素子に対して定められている使用可能な限界値に達したときを前記サージ保護素子の寿命がつきたと判定する
ことを特徴とするサージ保護素子の劣化監視装置。 In the deterioration monitoring device for a surge protection element according to claim 1,
The deterioration degree determination unit
It is determined that the life of the surge protection element has been reached when the accumulated number of times reaches a usable limit value determined for the surge protection element.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112600181A (en) * 2020-12-11 2021-04-02 北京京航计算通讯研究所 Strong electromagnetic pulse protection system with device degradation self-monitoring function

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS519894B1 (en) * 1969-10-22 1976-03-31
JPH02111003A (en) * 1988-10-20 1990-04-24 Matsushita Electric Works Ltd Current transformer
JPH06276674A (en) * 1993-03-19 1994-09-30 Sharp Corp Safety protective circuit
JPH07280845A (en) * 1994-04-14 1995-10-27 Yazaki Corp Current detector
JPH08178990A (en) * 1994-12-27 1996-07-12 Toshiba Corp Lightning arrester diagnosing apparatus
JPH10253685A (en) * 1997-03-05 1998-09-25 Hioki Ee Corp Apparatus for inspecting measuring leakage current
JP2001281270A (en) * 2000-03-31 2001-10-10 Sumitomo Special Metals Co Ltd Split type current detector
JP2004273362A (en) * 2003-03-11 2004-09-30 Hitachi Kokusai Electric Inc Lifetime determination method and lifetime determination circuit for surge resistant element
WO2011058318A1 (en) * 2009-11-11 2011-05-19 Pepperl + Fuchs Gmbh Electrical circuit with surge protection monitoring
JP2011223645A (en) * 2010-04-02 2011-11-04 Nishi Nippon Electric Wire & Cable Co Ltd Power supply mechanism employing cable ground current
JP2014048188A (en) * 2012-08-31 2014-03-17 Bekutoru:Kk Current sensor

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS519894B1 (en) * 1969-10-22 1976-03-31
JPH02111003A (en) * 1988-10-20 1990-04-24 Matsushita Electric Works Ltd Current transformer
JPH06276674A (en) * 1993-03-19 1994-09-30 Sharp Corp Safety protective circuit
JPH07280845A (en) * 1994-04-14 1995-10-27 Yazaki Corp Current detector
JPH08178990A (en) * 1994-12-27 1996-07-12 Toshiba Corp Lightning arrester diagnosing apparatus
JPH10253685A (en) * 1997-03-05 1998-09-25 Hioki Ee Corp Apparatus for inspecting measuring leakage current
JP2001281270A (en) * 2000-03-31 2001-10-10 Sumitomo Special Metals Co Ltd Split type current detector
JP2004273362A (en) * 2003-03-11 2004-09-30 Hitachi Kokusai Electric Inc Lifetime determination method and lifetime determination circuit for surge resistant element
WO2011058318A1 (en) * 2009-11-11 2011-05-19 Pepperl + Fuchs Gmbh Electrical circuit with surge protection monitoring
JP2011223645A (en) * 2010-04-02 2011-11-04 Nishi Nippon Electric Wire & Cable Co Ltd Power supply mechanism employing cable ground current
JP2014048188A (en) * 2012-08-31 2014-03-17 Bekutoru:Kk Current sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112600181A (en) * 2020-12-11 2021-04-02 北京京航计算通讯研究所 Strong electromagnetic pulse protection system with device degradation self-monitoring function
CN112600181B (en) * 2020-12-11 2023-05-30 北京京航计算通讯研究所 Strong electromagnetic pulse protection system with device degradation self-monitoring function

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