JP2012050182A - Current transformer secondary opening protection circuit, electric board, and test plug - Google Patents

Current transformer secondary opening protection circuit, electric board, and test plug Download PDF

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JP2012050182A
JP2012050182A JP2010187513A JP2010187513A JP2012050182A JP 2012050182 A JP2012050182 A JP 2012050182A JP 2010187513 A JP2010187513 A JP 2010187513A JP 2010187513 A JP2010187513 A JP 2010187513A JP 2012050182 A JP2012050182 A JP 2012050182A
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current transformer
contact portion
secondary side
protection circuit
ctt
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JP5545738B2 (en
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Shingo Inoue
眞吾 井上
Akifumi Nishiyama
明文 西山
Manabu Honjo
学 本庄
Takayoshi Higuchi
貴好 樋口
Shuzo Nakayama
修造 中山
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Chugoku Electric Power Co Inc
Chugoku Electrical Instruments Co Ltd
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Chugoku Electric Power Co Inc
Chugoku Electrical Instruments Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To ensure safety and prevent generation of apparatus damage.SOLUTION: During current measurement with a CTT plug into a CTT terminal, for example, when a break occurs in a wiring, a high voltage occurs between both electrodes of CTT plug, discharge occurs in a discharge gap 16 of a CT secondary opening protection circuit 1, a discharge current flows through a fuse 21, and a fuse 21 is burnt. When the fuse 21 pulling a movable contact part 19 is burnt, the movable contact point 19 serving as a leaf spring restores, comes into contact with a fixed contact part 18, and a short circuit is formed between both the electrodes of the CTT plug through a wiring a3.

Description

この発明は、例えば、変電所等の電気所に設置される変流器の二次側開放時に、少なくとも変流器を保護するための変流器二次側開放保護回路、電気盤及びテストプラグに関する。   The present invention provides, for example, a current transformer secondary side open protection circuit, an electrical panel, and a test plug for protecting at least the current transformer when the secondary side of a current transformer installed in an electric station such as a substation is opened. About.

例えば、電力用制御装置としての遠隔監視制御装置は、変流器回路にＣＴＴターミナルが組み込まれたＴＣ盤を含んでいる。電流計測時には、電流計がＣＴＴプラグ（電流測定用テストプラグ）を介して、ＴＣ盤のＣＴＴターミナルに接続される。   For example, a remote monitoring control device as a power control device includes a TC board in which a CTT terminal is incorporated in a current transformer circuit. At the time of current measurement, the ammeter is connected to the CTT terminal of the TC board via a CTT plug (current measurement test plug).

しかしながら、ＣＴＴプラグをＣＴＴターミナルのプラグ挿入口に挿入して電流を計測するときに、例えば、外力等によって、配線が端子から外れたり、断線したり、ＣＴＴプラグが経年劣化によって断線して、ＣＴ２次回路が開放されてしまうことがあった。ＣＴ２次回路が開放されると、高電圧が発生してアーク放電し、人体が触れると感電の危険があった。しかしながら、従来は、人体や機器を保護するものは備えられていなかった。   However, when the CTT plug is inserted into the plug insertion port of the CTT terminal and the current is measured, for example, due to an external force or the like, the wiring is disconnected from the terminal or disconnected, or the CTT plug is disconnected due to aging, and the CT2 The next circuit could be opened. When the CT secondary circuit is opened, a high voltage is generated and arc discharge occurs. When the human body touches, there is a risk of electric shock. Conventionally, however, nothing has been provided to protect the human body or equipment.

アーク放電したままにしておくと、発熱して機器が焼損するので、早急にＣＴＴプラグを危険覚悟で抜き取る必要があった。   If the arc discharge is left as it is, heat will be generated and the equipment will burn out, so it was necessary to remove the CTT plug as soon as possible.

このため、互いに逆方向の２つのダイオードを並列接続した保護装置を、ＣＴの２次側に接続する技術が提案されている（例えば、特許文献１参照。）。   For this reason, a technique has been proposed in which a protection device in which two diodes in opposite directions are connected in parallel is connected to the secondary side of the CT (see, for example, Patent Document 1).

特開平９―１６８２３１号公報Japanese Patent Laid-Open No. 9-168231

しかしながら、上記従来技術では、例えば、ダイオードの劣化によって、ＣＴ２次側開放時に確実に保護できない可能性があり、作業員への危険や、機器の損傷等を完全になくすことは困難である。   However, in the above prior art, for example, there is a possibility that the protection cannot be surely performed when the secondary side of the CT is opened due to deterioration of the diode, and it is difficult to completely eliminate danger to workers and damage to equipment.

この発明は、前記の課題を解決し、安全性を確保し、かつ、機器の損傷を防止することができる変流器二次側開放保護回路、電気盤及びテストプラグを提供することを目的としている。   An object of the present invention is to solve the above-mentioned problems, to provide a current transformer secondary-side open protection circuit, an electrical panel, and a test plug that can ensure safety and prevent damage to equipment. Yes.

前記の課題を解決するために、請求項１の発明は、変流器の二次側開放時に、少なくとも前記変流器を保護するための変流器二次側開放保護回路であって、前記変流器の一方の二次端子に接続される第１の電極と、所定の放電ギャップを隔てて前記第１の電極に対向して配置される第２の電極と、前記変流器の他方の二次端子に接続される第１の接点部と、前記第１の電極に接続した第２の接点部とを備え、前記第１の接点部が前記第２の接点部に対して、前記変流器の二次側が非開放状態で非接続状態とされ、前記変流器の二次側が開放状態で接続状態とされるように構成されていることを特徴としている。   In order to solve the above-mentioned problems, the invention of claim 1 is a current transformer secondary side open protection circuit for protecting at least the current transformer when the secondary side of the current transformer is opened, A first electrode connected to one of the secondary terminals of the current transformer; a second electrode disposed opposite the first electrode with a predetermined discharge gap; and the other of the current transformer A first contact portion connected to the secondary terminal and a second contact portion connected to the first electrode, the first contact portion with respect to the second contact portion, The secondary side of the current transformer is in a non-open state and is in a disconnected state, and the secondary side of the current transformer is configured in an open state and in a connected state.

請求項１の発明では、第１の接点部が第２の接点部に対して、変流器の二次側が非開放状態で非接続状態とされ、変流器の二次側が開放状態で接続状態とされる。   According to the first aspect of the present invention, the first contact portion is connected to the second contact portion in a non-open state when the secondary side of the current transformer is not open, and is connected while the secondary side of the current transformer is open. State.

請求項２の発明は、請求項１に記載の変流器二次側開放保護回路であって、前記変流器の二次側が非開放状態で、前記第２の電極と前記第１の接点部とを電気的に接続するヒューズ部材を備え、前記第１の接点部は弾性を有する板状部材から構成され、前記ヒューズ部材は、前記変流器の二次側が非開放状態で、前記第１の接点部を引っ張って前記第２の接点部から離隔させ、前記変流器の二次側が開放状態で、前記放電ギャップにおける放電によって流れる電流によって溶断して前記第１の接点部を引き離し、前記第１の接点部を前記第２の接点部に接触させることを特徴としている。   The invention according to claim 2 is the current transformer secondary side open protection circuit according to claim 1, wherein the secondary side of the current transformer is in a non-open state, and the second electrode and the first contact point. A fuse member that electrically connects the first current contact portion is formed of a plate member having elasticity, and the fuse member is configured such that the secondary side of the current transformer is in an unopened state, Pulling the first contact portion away from the second contact portion, the secondary side of the current transformer is open, and the first contact portion is separated by fusing by the current flowing by the discharge in the discharge gap, The first contact portion is brought into contact with the second contact portion.

請求項３の発明は、請求項１に記載の変流器二次側開放保護回路であって、前記第１の接点部は、バイメタルから構成され、前記変流器の二次側が非開放状態で、前記第２の接点部から離隔され、前記変流器の二次側が開放状態で、前記放電ギャップにおける放電によって発生する熱によって湾曲変形して、前記第２の接点部に接触するように配置されていることを特徴としている。   Invention of Claim 3 is a current transformer secondary side open circuit protection circuit of Claim 1, Comprising: The said 1st contact part is comprised from a bimetal, and the secondary side of the said current transformer is a non-open state The second contact portion is separated from the second contact portion, the secondary side of the current transformer is open, and is bent and deformed by the heat generated by the discharge in the discharge gap so as to contact the second contact portion. It is characterized by being arranged.

請求項４の発明は、請求項１、２又は３に記載の変流器二次側開放保護回路であって、所定の機能を有し、前記変流器が接続され、電流計測のために用いられるテストターミナルが設けられた電気盤に接続され、前記第１の電極及び前記第１の接点部は、前記電気盤に設けられ、前記変流器の両二次端子に接続された対応する対をなす端子にそれぞれ接続されることを特徴としている。   The invention of claim 4 is the current transformer secondary side open protection circuit according to claim 1, 2 or 3, and has a predetermined function, and the current transformer is connected to measure current. The test terminal used is connected to an electrical board provided, and the first electrode and the first contact portion are provided on the electrical board and connected to both secondary terminals of the current transformer. It is characterized by being connected to a pair of terminals.

請求項５の発明は、所定の機能を有し、変流器が接続され、電流計測のために用いられるテストターミナルが設けられた電気盤であって、請求項１乃至４のいずれか１に記載の変流器二次側開放保護回路を備え、前記変流器の両二次端子に接続された対応する対をなす端子に、前記変流器二次側開放保護回路の前記第１の電極及び前記第１の接点部がそれぞれ接続されていることを特徴としている。   The invention of claim 5 is an electric board having a predetermined function, to which a current transformer is connected, and provided with a test terminal used for current measurement. The current transformer secondary side open protection circuit, and a corresponding pair of terminals connected to both secondary terminals of the current transformer are connected to the first of the current transformer secondary side open protection circuit. An electrode and the first contact point are connected to each other.

請求項６の発明は、所定の機能を有し、変流器が接続されテストターミナルが設けられた電気盤に装着され、電流計測のために用いられるテストプラグであって、請求項１乃至４のいずれか１に記載の変流器二次側開放保護回路を備え、前記テストターミナルへの装着時に前記変流器の両二次端子に前記テストターミナルを介して接続される対応する対をなす端子に、前記変流器二次側開放保護回路の前記第１の電極及び前記第１の接点部が接続されていることを特徴としている。   A sixth aspect of the present invention is a test plug that has a predetermined function, is attached to an electrical board provided with a current transformer and provided with a test terminal, and is used for current measurement. The current transformer secondary-side open-circuit protection circuit according to any one of the above is provided, and a corresponding pair is connected to both secondary terminals of the current transformer via the test terminal when mounted on the test terminal. The terminal is connected to the first electrode and the first contact portion of the current transformer secondary side open circuit protection circuit.

請求項１の発明によれば、第１の接点部が第２の接点部に対して、変流器の二次側が非開放状態で非接続状態とされ、変流器の二次側が開放状態で接続状態とされて、変流器二次側が短絡されるので、安全性を確保し、かつ、機器の損傷を防止することができる。   According to the invention of claim 1, the first contact portion is not connected to the second contact portion in the non-open state in the secondary side of the current transformer, and the secondary side of the current transformer is in the open state. Since the current transformer secondary side is short-circuited, safety can be ensured and damage to the equipment can be prevented.

請求項２の発明によれば、ヒューズ部材は、変流器の二次側が非開放状態で、第１の接点部を引っ張って第２の接点部から離隔させ、変流器の二次側が開放状態で、放電ギャップにおける放電によって流れる電流によって溶断して第１の接点部を引き離し、第１の接点部を第２の接点部に接触させるので、簡易な構成で、安全性を確保し、かつ、機器の損傷を防止することができる。   According to the invention of claim 2, the fuse member has the secondary side of the current transformer not opened, and the first contact part is pulled away from the second contact part, and the secondary side of the current transformer is opened. In the state, the first contact portion is separated by fusing by the current flowing by the discharge in the discharge gap, and the first contact portion is brought into contact with the second contact portion, thereby ensuring safety with a simple configuration, and , Can prevent equipment damage.

請求項３の発明によれば、第１の接点部は、バイメタルから構成され、変流器の二次側が非開放状態で、第２の接点部から離隔され、変流器の二次側が開放状態で、放電ギャップにおける放電によって発生する熱によって湾曲変形して、第２の接点部に接触するように配置されているので、簡易な構成で、安全性を確保し、かつ、機器の損傷を防止することができる。   According to the invention of claim 3, the first contact portion is made of bimetal, the secondary side of the current transformer is in an unopened state, is separated from the second contact portion, and the secondary side of the current transformer is open. In the state, it is arranged so as to be bent and deformed by the heat generated by the discharge in the discharge gap and to contact the second contact portion, so that the safety can be ensured and the device can be damaged with a simple configuration. Can be prevented.

請求項４の発明によれば、電気盤のテストターミナルにテストプラグを装着して電流計測を行う際に、例えば、テストプラグと電流計とを接続する配線が断線して、変流器の二次側が開放状態とされても、安全性を確保し、かつ、機器の損傷を防止することができる。   According to the fourth aspect of the present invention, when the test plug is attached to the test terminal of the electrical panel and current measurement is performed, for example, the wiring connecting the test plug and the ammeter is disconnected, and the current transformer 2 Even if the secondary side is in an open state, safety can be ensured and damage to the device can be prevented.

請求項５の発明によれば、第１の接点部が第２の接点部に対して、変流器の二次側が非開放状態で非接続状態とされ、変流器の二次側が開放状態で接続状態とされて、変流器二次側が短絡されるので、安全性を確保し、かつ、機器の損傷を防止することができる。   According to the invention of claim 5, the first contact portion is not connected to the second contact portion in the non-open state in the secondary side of the current transformer, and the secondary side of the current transformer is in the open state. Since the current transformer secondary side is short-circuited, safety can be ensured and damage to the equipment can be prevented.

請求項６の発明によれば、第１の接点部が第２の接点部に対して、変流器の二次側が非開放状態で非接続状態とされ、変流器の二次側が開放状態で接続状態とされて、変流器二次側が短絡されるので、安全性を確保し、かつ、機器の損傷を防止することができる。   According to the invention of claim 6, the first contact portion is not connected to the second contact portion in the non-open state in the secondary side of the current transformer, and the secondary side of the current transformer is in the open state. Since the current transformer secondary side is short-circuited, safety can be ensured and damage to the equipment can be prevented.

この発明の一実施の形態によるＣＴ２次側開放保護回路の構成及び機能を説明するための説明図である。It is explanatory drawing for demonstrating the structure and function of CT secondary side open circuit protection circuit by one Embodiment of this invention. 同ＣＴ２次側開放保護回路の構成及び機能を説明するための説明図である。It is explanatory drawing for demonstrating a structure and function of the CT secondary side open circuit protection circuit. この発明の一実施の形態に係る電気所に配置された遠隔監視制御装置のＴＣ盤の構成を説明するための説明図である。It is explanatory drawing for demonstrating the structure of TC board of the remote monitoring control apparatus arrange | positioned in the electric station which concerns on one embodiment of this invention. 同ＴＣ盤のＣＴＴターミナルにＣＴＴプラグが挿入された状態を示す図である。It is a figure which shows the state by which the CTT plug was inserted in the CTT terminal of the same TC board. 同ＣＴ２次側開放保護回路の同ＴＣ盤への取付方法を説明するための説明図である。It is explanatory drawing for demonstrating the attachment method to the TC board of the same CT secondary side open circuit protection circuit. ４極のＣＴＴプラグの構成、及び同ＣＴＴプラグへの電流計測器の接続方法を説明するための説明図である。It is explanatory drawing for demonstrating the structure of a 4 pole CTT plug, and the connection method of the current measuring device to the CTT plug. ２極のＣＴＴプラグの構成、及び同ＣＴＴプラグへの電流計測器の接続方法を説明するための説明図である。It is explanatory drawing for demonstrating the structure of a 2 pole CTT plug, and the connection method of the current measuring device to the CTT plug. 同ＣＴ２次側開放保護回路のＣＴＴプラグへの接続方法を説明するための説明図である。It is explanatory drawing for demonstrating the connection method to the CTT plug of the CT secondary side open protection circuit. 同ＣＴ２次側開放保護回路が取り付けられたＣＴＴプラグを示す図である。It is a figure which shows the CTT plug with which the same CT secondary side open circuit protection circuit was attached.

次に、この発明の実施の形態について、図面を用いて詳しく説明する。   Next, embodiments of the present invention will be described in detail with reference to the drawings.

図１及び図２は、この発明の一実施の形態によるＣＴ２次側開放保護回路の構成及び機能を説明するための説明図、図３は、この発明の一実施の形態に係る電気所に配置された遠隔監視制御装置のＴＣ盤の構成を説明するための説明図、図４は、同ＴＣ盤のＣＴＴターミナルにＣＴＴプラグが挿入された状態を示す図、図５は、同ＣＴ２次側開放保護回路の同ＴＣ盤への取付方法を説明するための説明図、図６は、４極のＣＴＴプラグの構成、及び同ＣＴＴプラグへの電流計測器の接続方法を説明するための説明図、図７は、２極のＣＴＴプラグの構成、及び同ＣＴＴプラグへの電流計測器の接続方法を説明するための説明図である。   1 and 2 are explanatory diagrams for explaining the configuration and function of a CT secondary side open protection circuit according to an embodiment of the present invention, and FIG. 3 is arranged in an electric station according to an embodiment of the present invention. FIG. 4 is a diagram showing a state in which a CTT plug is inserted into the CTT terminal of the TC panel, and FIG. 5 is a diagram showing the CT secondary side opened. FIG. 6 is an explanatory diagram for explaining a method of attaching the protection circuit to the TC board. FIG. 6 is an explanatory diagram for explaining a configuration of a four-pole CTT plug and a method of connecting a current measuring device to the CTT plug. FIG. 7 is an explanatory diagram for explaining a configuration of a two-pole CTT plug and a method of connecting a current measuring device to the CTT plug.

図１乃至図５に示すように、この実施の形態のＣＴ２次側開放保護回路１は、変電所等の電気所に配置されたＣＴ（変流器）２を保護するために用いられ、例えば、遠隔監視制御装置を構成する電気盤としてのＴＣ盤３のＣＴ２の両二次端子に接続された対応する対をなす端子２７ａ，２７ｂ（及び前面部４に配置されたＣＴＴターミナル５（６）の上下の両極間）に接続される。ＣＴ２次側開放保護回路１は、電流計測時には、ＣＴＴターミナル５（６）に挿入されたＣＴＴプラグ７（８）を介して接続された電流計測器１１に対して並列に配置されるように、ＴＣ盤３の後面部１２に配置された端子部１３に接続される。   As shown in FIGS. 1 to 5, the CT secondary side open protection circuit 1 of this embodiment is used to protect a CT (current transformer) 2 disposed in an electric station such as a substation. The corresponding terminals 27a and 27b (and the CTT terminal 5 (6) arranged on the front face 4) connected to the secondary terminals of the CT2 of the TC board 3 as the electric board constituting the remote monitoring control device Between the upper and lower poles). The CT secondary side open protection circuit 1 is arranged in parallel with the current measuring instrument 11 connected via the CTT plug 7 (8) inserted in the CTT terminal 5 (6) at the time of current measurement. It is connected to a terminal portion 13 disposed on the rear surface portion 12 of the TC board 3.

また、ＴＣ盤３においては、変流器回路にＣＴＴターミナル５，５，…、６，６，…が組み込まれ、例えば、４極用のＣＴＴプラグ７を用いて、変圧器の二次側の線路を流れる２次電流に対応する電流が、２極用のＣＴＴプラグ８を用いて、各配電線のフィーダ電流に対応する電流が、電流計測器１１によって計測される。   In the TC board 3, CTT terminals 5, 5, ..., 6, 6, ... are incorporated in the current transformer circuit. For example, a CTT plug 7 for four poles is used to connect the secondary side of the transformer. The current corresponding to the secondary current flowing through the line is measured by the current measuring instrument 11 using the bipolar CTT plug 8 and the current corresponding to the feeder current of each distribution line.

ＣＴ２次側開放保護回路１は、図１及び図２に示すように、配線ａ１によってＣＴ２の一方の２次端子（２次巻線の一方側）に電気的に接続された放電電極１５と、放電電極１５に対向配置され、放電電極１５との間で放電ギャップ１６を形成する放電電極１７と、固定接点部１８と、配線ａ２によってＣＴ２の他方の２次端子に電気的に接続され、板ばねとしての可動接点部１９とが絶縁体２２に配置され、通常時（ＣＴ２の２次側が非開放状態のとき）は放電電極１７と可動接点部１９とはヒューズ２１によって電気的及び機械的に接続され、かつ、放電電極１５と固定接点１８とは配線ａ３を介して接続されて概略構成されている。   As shown in FIGS. 1 and 2, the CT secondary side open protection circuit 1 includes a discharge electrode 15 electrically connected to one secondary terminal (one side of the secondary winding) of CT2 by a wiring a1, Disposed oppositely to the discharge electrode 15 and electrically connected to the other secondary terminal of the CT 2 by a discharge electrode 17 that forms a discharge gap 16 with the discharge electrode 15, a fixed contact portion 18, and a wiring a 2, A movable contact portion 19 as a spring is disposed on the insulator 22, and the discharge electrode 17 and the movable contact portion 19 are electrically and mechanically connected by a fuse 21 during normal operation (when the secondary side of CT 2 is in an unopened state). The discharge electrode 15 and the fixed contact 18 are connected to each other via a wiring a3 and are schematically configured.

通常時は、図１に示すように、放電電極１７と可動接点部１９とはヒューズ２１によって電気的及び機械的に接続され、ヒューズ２１は、可動接点部１９の復元力に抗して、可動接点部１９を固定接点部１８から離反させて非接続状態とするように引っ張る。これにより、放電電極１５・可動接点部１９間は、非接続状態とされている。   In normal times, as shown in FIG. 1, the discharge electrode 17 and the movable contact portion 19 are electrically and mechanically connected by a fuse 21, and the fuse 21 is movable against the restoring force of the movable contact portion 19. The contact portion 19 is pulled away from the fixed contact portion 18 so as to be disconnected. As a result, the discharge electrode 15 and the movable contact portion 19 are not connected.

異常時（ＣＴ２の２次側が開放状態のとき）は、放電ギャップ１６における放電により、ヒューズ２１に過電流（放電電流）が流れて、図２に示すように、ヒューズ２１が溶断し、可動接点部１９は復元力によって固定接点部１８に接触し、これにより、放電電極１５・可動接点部１９間は短絡される。例えば、ＣＴＴプラグ７（８）をＣＴＴターミナル５（６）に挿入した状態で、電流計測中に断線が発生すると、ＣＴＴプラグ７（８）両極間（ＣＴＴターミナル５（６）の両極間）に高電圧が発生する。   When an abnormality occurs (when the secondary side of CT2 is in an open state), an overcurrent (discharge current) flows through the fuse 21 due to discharge in the discharge gap 16, and as shown in FIG. The part 19 comes into contact with the fixed contact part 18 by a restoring force, whereby the discharge electrode 15 and the movable contact part 19 are short-circuited. For example, if a disconnection occurs during current measurement with the CTT plug 7 (8) inserted into the CTT terminal 5 (6), the CTT plug 7 (8) is located between both poles (between the CTT terminal 5 (6) poles). High voltage is generated.

ＣＴＴプラグ７（８）両極間に高電圧が発生すると、放電ギャップ１６において放電が発生する。放電が発生すると、ヒューズ２１に電流が流れ、図２に示すように、ヒューズ２１が切れる。可動接点部１９を引っ張っていたヒューズ２１が切れると板ばねとしての可動接点部１９が復元し、固定接点部１８に接触し、配線ａ３を介してＣＴＴプラグ７（８）両極間が短絡される。   When a high voltage is generated between both electrodes of the CTT plug 7 (8), a discharge is generated in the discharge gap 16. When discharge occurs, a current flows through the fuse 21 and the fuse 21 is blown as shown in FIG. When the fuse 21 that pulled the movable contact portion 19 is blown, the movable contact portion 19 as a leaf spring is restored, contacts the fixed contact portion 18, and the CTT plug 7 (8) both electrodes are short-circuited via the wiring a3. .

ここで、放電ギャップ１６は、ＣＴ２の飽和電圧に応じて設定される。また、例えば、ＣＴ２の定格電流が５［Ａ］の場合は、ヒューズ２１の定格電流は０．１［Ａ］等とされる。なお、この実施の形態では、ＣＴ２次側開放保護回路１は、ヒューズ断を示す表示窓２３を有している。   Here, the discharge gap 16 is set according to the saturation voltage of CT2. For example, when the rated current of CT2 is 5 [A], the rated current of the fuse 21 is set to 0.1 [A] or the like. In this embodiment, the CT secondary-side open protection circuit 1 has a display window 23 that indicates a blown fuse.

ＣＴ２次側開放保護回路１は、図５に示すように、各相に対応させて、ＴＣ盤３の後面部１２に配置されたソケット２５に着脱自在に取り付けられている。ソケット２５の端子２６ａ（２６ｂ）は、端子部１３の対応する端子２７ａ（２７ｂ）に接続されている。   As shown in FIG. 5, the CT secondary side open protection circuit 1 is detachably attached to a socket 25 arranged on the rear surface portion 12 of the TC board 3 in correspondence with each phase. The terminal 26 a (26 b) of the socket 25 is connected to the corresponding terminal 27 a (27 b) of the terminal portion 13.

ＣＴＴプラグ７は、図６に示すように、上下に互いに絶縁された各一対の接触子２９，３１が絶縁板３２に設けられ、一対の接触子２９，３１の反対側には、同軸上に配設された一対の端子３３ａ，３３ｂ（３４ａ，３４ｂ、３５ａ，３５ｂ、３６ａ，３６ｂ）が接触子２９，３１に接続されて概略構成されている。   As shown in FIG. 6, the CTT plug 7 includes a pair of contacts 29 and 31 that are insulated from each other on the insulating plate 32. The CTT plug 7 is coaxially disposed on the opposite side of the pair of contacts 29 and 31. A pair of arranged terminals 33a and 33b (34a, 34b, 35a, 35b, 36a, 36b) are connected to the contacts 29, 31 and are schematically configured.

ＣＴＴプラグ８は、図７に示すように、上下に互いに絶縁された各一対の接触子３９，４１が絶縁板４２に設けられ、一対の接触子３９，４１の反対側には、同軸上に配設された一対の端子４３ａ，４３ｂ（４４ａ，４４ｂ）が接触子３９，４１に接続されて概略構成されている。   As shown in FIG. 7, the CTT plug 8 includes a pair of contacts 39 and 41 that are insulated from each other on the insulating plate 42. The CTT plug 8 is coaxially disposed on the opposite side of the pair of contacts 39 and 41. A pair of arranged terminals 43a and 43b (44a and 44b) are connected to the contacts 39 and 41 so as to be schematically configured.

次に、ＣＴ２次側開放保護回路１の動作について説明する。まず、図５に示すように、予め、ＣＴ２次側開放保護回路１を、ＴＣ盤３の後面部１２に配置された端子部１３にソケット２５を介して接続しておく。   Next, the operation of the CT secondary side open protection circuit 1 will be described. First, as shown in FIG. 5, the CT secondary side open protection circuit 1 is connected in advance to a terminal portion 13 disposed on the rear surface portion 12 of the TC board 3 via a socket 25.

次に、図６（図７）に示すように、ＣＴＴプラグ７（８）に、電流計測器１１を接続する。すなわち、４極のＣＴＴプラグ７については、図６に示すように、電流計測器１１の所定の端子と、ＣＴＴプラグ７の端子３３ａ，３３ｂ（３４ａ，３４ｂ、３５ａ，３５ｂ）とを配線ｂ１，ｂ２（ｂ３，ｂ４、ｂ５，ｂ６）によって、接続する。ここで、導通金具ｂ７によって、計測対象外の端子３６ａ，３６ｂは、短絡させておく。   Next, as shown in FIG. 6 (FIG. 7), the current measuring instrument 11 is connected to the CTT plug 7 (8). That is, for the four-pole CTT plug 7, as shown in FIG. 6, the predetermined terminal of the current measuring instrument 11 and the terminals 33a and 33b (34a, 34b, 35a, 35b) of the CTT plug 7 are connected to the wiring b1, Connection is made by b2 (b3, b4, b5, b6). Here, the terminals 36a and 36b that are not to be measured are short-circuited by the conductive fitting b7.

また、２極のＣＴＴプラグ８については、図７に示すように、電流計測器１１の所定の端子と、ＣＴＴプラグ８の端子４３ａ，４３ｂ（４４ａ，４４ｂ）とを配線ｃ１，ｃ２（ｃ３，ｃ４）によって接続する。   As for the two-pole CTT plug 8, as shown in FIG. 7, predetermined terminals of the current measuring instrument 11 and terminals 43a, 43b (44a, 44b) of the CTT plug 8 are connected to wirings c1, c2 (c3, c3). Connect by c4).

次に、図４に示すように、ＣＴＴプラグ７（８）を、ＴＣ盤３の対応するＣＴＴターミナル５（６）のプラグ挿入口に挿入する。こうして、電流計測器１１を、ＣＴＴプラグ７（８）を介して、ＣＴ２次側開放保護回路１に並列に、遠隔監視制御装置のＴＣ盤３に接続する。   Next, as shown in FIG. 4, the CTT plug 7 (8) is inserted into the plug insertion port of the corresponding CTT terminal 5 (6) of the TC board 3. In this way, the current measuring instrument 11 is connected to the TC board 3 of the remote monitoring control device in parallel with the CT secondary side open protection circuit 1 via the CTT plug 7 (8).

通常時には、図１に示すように、電流計測器１１に並列に接続されたＣＴ２次側開放保護回路１において、板ばねとしての可動接点部１９は、ヒューズ２１によって引っ張られて、固定接点部１８とは非接続状態となっている。この状態で、電流計測器１１を用いて電流の計測が行われる。   In the normal state, as shown in FIG. 1, in the CT secondary side open protection circuit 1 connected in parallel to the current measuring instrument 11, the movable contact portion 19 as a leaf spring is pulled by a fuse 21 and fixed contact portion 18 is obtained. Is in a disconnected state. In this state, the current is measured using the current measuring instrument 11.

ＣＴＴプラグ７（８）をＣＴＴターミナル５（６）に挿入した状態で、電流計測中に、例えば、配線ｂ１（ｂ２，ｂ３，…、ｃ１，ｃ２，…）等の所定の箇所Ｋにおいて、断線が発生すると、ＣＴＴプラグ７（８）両極間に高電圧が発生する。ＣＴＴプラグ７（８）両極間に高電圧が発生すると、ＣＴ２次側開放保護回路１の放電ギャップ１６において放電が発生する。放電が発生すると、ヒューズ２１に過電流（放電電流）が流れ、ヒューズ２１が切れて、図２に示すように、断線片２１ａ，２１ｂになる。可動接点部１９を引っ張っていたヒューズ２１が切れると、板ばねとしての可動接点部１９が復元し、固定接点部１８に接触し、配線ａ３を介してＣＴＴプラグ７（８）両極間が短絡される。この状態で、ＣＴＴプラグ７（８）を安全に抜き取ることができる。この後、ＣＴ２次側開放保護回路１を取り替える。   With the CTT plug 7 (8) inserted into the CTT terminal 5 (6), during current measurement, for example, at a predetermined location K such as the wiring b1 (b2, b3,..., C1, c2,...) When this occurs, a high voltage is generated between both poles of the CTT plug 7 (8). When a high voltage is generated between both electrodes of the CTT plug 7 (8), a discharge is generated in the discharge gap 16 of the CT secondary side open protection circuit 1. When discharge occurs, an overcurrent (discharge current) flows through the fuse 21 and the fuse 21 is blown, resulting in disconnection pieces 21a and 21b as shown in FIG. When the fuse 21 that has pulled the movable contact portion 19 is blown, the movable contact portion 19 as a leaf spring is restored, contacts the fixed contact portion 18, and the CTT plug 7 (8) both electrodes are short-circuited via the wiring a3. The In this state, the CTT plug 7 (8) can be safely removed. Thereafter, the CT secondary side open protection circuit 1 is replaced.

こうして、この実施の形態の構成によれば、ＣＴ２次回路が開放されたときに発生する高電圧を利用して、ヒューズ２１を溶断させて、可動接点部１９と固定接点部１８とを接触させて、ＣＴ回路を短絡させる簡易な構成とされているので、安全性を確保しつつ計測を実施することができる。   Thus, according to the configuration of this embodiment, the fuse 21 is blown using the high voltage generated when the CT secondary circuit is opened, and the movable contact portion 19 and the fixed contact portion 18 are brought into contact with each other. Thus, since the CT circuit is short-circuited, measurement can be performed while ensuring safety.

例えば、高電圧は一瞬しか発生しないので、機器の損傷を防止することができる。また、配線が外れたＣＴＴプラグは、安全に抜き取ることができる。   For example, since a high voltage is generated only for a moment, damage to the device can be prevented. Moreover, the CTT plug from which the wiring has been removed can be safely removed.

以上、この発明の実施の形態について、図面を参照して詳述してきたが、具体的な構成はこれらの実施の形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計の変更等があってもこの発明に含まれる。例えば、上述した実施の形態では、電気所において、変圧器の二次側の線路を流れる二次電流や、各配電線のフィーダ電流を計測するためのＣＴ２を保護するために用いる場合について述べたが、一般に、ＣＴが配置された任意の箇所で、このＣＴを保護するために適用できる。   Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the gist of the present invention. Are included in the present invention. For example, in the above-described embodiment, the case where the electric current is used to protect the secondary current flowing through the secondary line of the transformer and the CT2 for measuring the feeder current of each distribution line has been described. However, in general, it can be applied to protect the CT at any place where the CT is arranged.

また、ＣＴ２次側開放保護回路１を電気盤に取り付けて用いる場合について述べたが、図８に示すように、例えば、ＣＴＴプラグ７に電流計測器１１に並列に接続して用いても良い。また、図９に示すように、ＣＴＴプラグ本体にソケットを接続して一体化し、ＣＴ２次側開放保護回路１を着脱自在に取り付け、保護回路付きＣＴＴプラグ４６として用いても良い。ここで、ＣＴ２次側開放保護回路１を、ＣＴＴプラグ本体の上面部や下面部に配置しても良いし、側面部に配置しても良い。また、ＣＴ２次側開放保護回路１を立てた状態で配置しても良いし、伏せた状態で配置しても良い。また、ＣＴ２次側開放保護回路１はＣＴＴプラグ本体に内蔵されていても良い。   Further, although the case where the CT secondary side open protection circuit 1 is used by being attached to an electric board has been described, as shown in FIG. 8, for example, it may be connected to a current measuring instrument 11 in parallel with a CTT plug 7. Further, as shown in FIG. 9, a CTT plug body may be integrated by connecting a socket, and the CT secondary side open protection circuit 1 may be detachably attached and used as a CTT plug 46 with a protection circuit. Here, the CT secondary side open protection circuit 1 may be disposed on the upper surface portion or the lower surface portion of the CTT plug body, or may be disposed on the side surface portion. Moreover, you may arrange | position in the state which stood the CT secondary side open protection circuit 1, and you may arrange | position in the face down state. The CT secondary side open protection circuit 1 may be built in the CTT plug body.

また、電流計測器１１を接続して、３相同時に計測する場合について述べたが、１相毎に電流計を接続して計測するようにしても良い。また、電流計測器１１において、表示に加えて又は代えて、音声で計測値を報知するようにしても良い。また、ヒューズ２１を設けるのに代えて、可動接点部１９を例えばバイメタルから構成し、放電時に発生する熱によって、可動接点部１９を湾曲させて固定接点部１８に接触させて閉路させるようにしても良い。この場合は、放電電極１７と可動接点部２１とは、接続されていなくても良い。また、固定接点部１８及び可動接点１９に代えて、例えば、家庭用のブレーカ機構が用いられても良い。   Moreover, although the case where the current measuring device 11 is connected and three phases are measured simultaneously has been described, an ammeter may be connected and measured for each phase. Further, in the current measuring instrument 11, in addition to or instead of the display, the measurement value may be notified by voice. Further, instead of providing the fuse 21, the movable contact portion 19 is made of, for example, a bimetal, and the movable contact portion 19 is bent and brought into contact with the fixed contact portion 18 by heat generated at the time of discharge to be closed. Also good. In this case, the discharge electrode 17 and the movable contact portion 21 may not be connected. Further, for example, a home breaker mechanism may be used in place of the fixed contact portion 18 and the movable contact 19.

電気所として、変電所のほか、発電所等について適用できる。また、電気盤として、ＴＣ盤以外の電気盤に適用できる。   Applicable to substations, power stations, etc. as electrical stations. Moreover, it can apply to electric boards other than TC board as an electric board.

１ ＣＴ２次側開放保護回路（変流器二次側開放保護回路）
２ ＣＴ（変流器）
３ ＴＣ盤（電気盤）
７，８ ＣＴＴプラグ（テストプラグ）
１５ 放電電極（第１の電極）
１６ 放電ギャップ
１７ 放電電極（第２の電極）
１８ 固定接点部（第２の接点部）
１９ 可動接点部（第１の接点部）
２１ ヒューズ（ヒューズ部材）
２７ａ，２７ｂ 端子
３３ａ，３３ｂ，… 端子
４３ａ，４３ｂ，… 端子 1 CT secondary side open circuit (current transformer secondary side open circuit)
2 CT (current transformer)
3 TC board (electric board)
7,8 CTT plug (test plug)
15 Discharge electrode (first electrode)
16 Discharge gap 17 Discharge electrode (second electrode)
18 Fixed contact part (second contact part)
19 Movable contact (first contact)
21 Fuses (fuse members)
27a, 27b Terminals 33a, 33b, ... Terminals 43a, 43b, ... Terminals

Claims (6)

変流器の二次側開放時に、少なくとも前記変流器を保護するための変流器二次側開放保護回路であって、
前記変流器の一方の二次端子に接続される第１の電極と、所定の放電ギャップを隔てて前記第１の電極に対向して配置される第２の電極と、前記変流器の他方の二次端子に接続される第１の接点部と、前記第１の電極に接続した第２の接点部とを備え、前記第１の接点部が前記第２の接点部に対して、前記変流器の二次側が非開放状態で非接続状態とされ、前記変流器の二次側が開放状態で接続状態とされるように構成されている
ことを特徴とする変流器二次側開放保護回路。 A current transformer secondary side open protection circuit for protecting at least the current transformer when the secondary side of the current transformer is opened,
A first electrode connected to one of the secondary terminals of the current transformer; a second electrode disposed opposite to the first electrode with a predetermined discharge gap; and A first contact portion connected to the other secondary terminal, and a second contact portion connected to the first electrode, the first contact portion with respect to the second contact portion, The current transformer secondary is configured such that the secondary side of the current transformer is in a non-open state and in a disconnected state, and the secondary side of the current transformer is in an open state and in a connected state. Side open protection circuit. 前記変流器の二次側が非開放状態で、前記第２の電極と前記第１の接点部とを電気的に接続するヒューズ部材を備え、前記第１の接点部は弾性を有する板状部材から構成され、前記ヒューズ部材は、前記変流器の二次側が非開放状態で、前記第１の接点部を引っ張って前記第２の接点部から離隔させ、前記変流器の二次側が開放状態で、前記放電ギャップにおける放電によって流れる電流によって溶断して前記第１の接点部を引き離し、前記第１の接点部を前記第２の接点部に接触させることを特徴とする請求項１に記載の変流器二次側開放保護回路。   A plate-shaped member having a fuse member that electrically connects the second electrode and the first contact portion when the secondary side of the current transformer is in an unopened state, and the first contact portion has elasticity The fuse member is configured such that when the secondary side of the current transformer is in an unopened state, the first contact portion is pulled away from the second contact portion, and the secondary side of the current transformer is opened. 2. In a state, the first contact portion is separated by fusing by a current flowing by discharge in the discharge gap, and the first contact portion is brought into contact with the second contact portion. Current transformer secondary side open circuit protection circuit. 前記第１の接点部は、バイメタルから構成され、前記変流器の二次側が非開放状態で、前記第２の接点部から離隔され、前記変流器の二次側が開放状態で、前記放電ギャップにおける放電によって発生する熱によって湾曲変形して、前記第２の接点部に接触するように配置されていることを特徴とする請求項１に記載の変流器二次側開放保護回路。   The first contact portion is made of bimetal, the secondary side of the current transformer is in an unopened state, separated from the second contact portion, the secondary side of the current transformer is in an open state, and the discharge 2. The current transformer secondary-side open protection circuit according to claim 1, wherein the current transformer secondary-side open protection circuit is arranged so as to be bent and deformed by heat generated by discharge in the gap and to contact the second contact portion. 所定の機能を有し、前記変流器が接続され、電流計測のために用いられるテストターミナルが設けられた電気盤に接続され、前記第１の電極及び前記第１の接点部は、前記電気盤に設けられ、前記変流器の両二次端子に接続された対応する対をなす端子にそれぞれ接続されることを特徴とする請求項１、２又は３に記載の変流器二次側開放保護回路。   The current transformer has a predetermined function, is connected to an electric board provided with a test terminal used for current measurement, and the first electrode and the first contact portion are connected to the electric terminal. 4. The current transformer secondary side according to claim 1, wherein the current transformer secondary side is connected to a corresponding pair of terminals provided on the panel and connected to both secondary terminals of the current transformer. Open protection circuit. 所定の機能を有し、変流器が接続され、電流計測のために用いられるテストターミナルが設けられた電気盤であって、
請求項１乃至４のいずれか１に記載の変流器二次側開放保護回路を備え、前記変流器の両二次端子に接続された対応する対をなす端子に、前記変流器二次側開放保護回路の前記第１の電極及び前記第１の接点部がそれぞれ接続されていることを特徴とする電気盤。 An electrical board having a predetermined function, connected to a current transformer, and provided with a test terminal used for current measurement,
A current transformer secondary side open protection circuit according to any one of claims 1 to 4, wherein the current transformer secondary is connected to a corresponding pair of terminals connected to both secondary terminals of the current transformer. The electrical board, wherein the first electrode and the first contact portion of the secondary side open protection circuit are connected to each other. 所定の機能を有し、変流器が接続されテストターミナルが設けられた電気盤に装着され、電流計測のために用いられるテストプラグであって、
請求項１乃至４のいずれか１に記載の変流器二次側開放保護回路を備え、前記テストターミナルへの装着時に前記変流器の両二次端子に前記テストターミナルを介して接続される対応する対をなす端子に、前記変流器二次側開放保護回路の前記第１の電極及び前記第１の接点部が接続されていることを特徴とするテストプラグ。 A test plug that has a predetermined function, is attached to an electric board provided with a current transformer and provided with a test terminal, and is used for current measurement,
5. The current transformer secondary-side open-circuit protection circuit according to claim 1, wherein the current transformer is connected to both secondary terminals of the current transformer via the test terminal when attached to the test terminal. The test plug, wherein the first electrode and the first contact portion of the current transformer secondary side open protection circuit are connected to corresponding pairs of terminals.
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CN103344796A (en) * 2013-06-28 2013-10-09 国家电网公司 Short circuit alternating current terminal strip testing device
KR102018903B1 (en) * 2019-07-01 2019-09-05 주식회사 피디엔에스 Test Plug with Preventing Apparatus Overvoltage
CN110648823A (en) * 2019-10-30 2020-01-03 国网山东省电力公司菏泽市定陶区供电公司 CT terminal box for quick wiring
KR20200037980A (en) * 2018-10-02 2020-04-10 한국전력공사 Terminal separator for testing of current transformer

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CN103344796A (en) * 2013-06-28 2013-10-09 国家电网公司 Short circuit alternating current terminal strip testing device
KR20200037980A (en) * 2018-10-02 2020-04-10 한국전력공사 Terminal separator for testing of current transformer
KR102621358B1 (en) 2018-10-02 2024-01-08 한국전력공사 Terminal separator for testing of current transformer
KR102018903B1 (en) * 2019-07-01 2019-09-05 주식회사 피디엔에스 Test Plug with Preventing Apparatus Overvoltage
CN110648823A (en) * 2019-10-30 2020-01-03 国网山东省电力公司菏泽市定陶区供电公司 CT terminal box for quick wiring
CN110648823B (en) * 2019-10-30 2024-04-26 国网山东省电力公司菏泽市定陶区供电公司 CT terminal box for quick wiring

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