JP7377522B2

JP7377522B2 - Current transformer, current transformer case, and current transformer case sealing method

Info

Publication number: JP7377522B2
Application number: JP2019199792A
Authority: JP
Inventors: 博之佐々木; 智和野村; 健二張野
Original assignee: NEC Magnus Communications Ltd
Current assignee: NEC Magnus Communications Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2023-11-10
Anticipated expiration: 2039-11-01
Also published as: JP2021072411A

Description

本発明は、カレントトランスに関し、特に、屋外、半屋外、地下、トンネル等で好ましく使用される分割型高周波カレントトランスの構造に関する。また本発明は、そのようなカレントトランスを収容するためのカレントトランス用ケースに関する。 The present invention relates to a current transformer, and particularly to the structure of a split type high-frequency current transformer that is preferably used outdoors, semi-outdoors, underground, in tunnels, and the like. The present invention also relates to a current transformer case for accommodating such a current transformer.

電力線の各種監視や電力線通信のカプラーとして高周波カレントトランスが用いられている（例えば特許文献１、２参照）。高周波カレントトランスによれば、電力線の導体に接触させることなく、高周波信号を注入・抽出することができる。また高周波カレントトランスの磁性コアが分割型である場合には、既存の電力線を加工することなく容易に設置することが可能である。 High-frequency current transformers are used as couplers for various types of power line monitoring and power line communication (see, for example, Patent Documents 1 and 2). According to the high-frequency current transformer, high-frequency signals can be injected and extracted without contacting the conductor of the power line. Furthermore, if the magnetic core of the high frequency current transformer is of a split type, it can be easily installed without modifying existing power lines.

特開２０１３－２２３０１８号公報Japanese Patent Application Publication No. 2013-223018 特開２００６－００５８８８号公報JP2006-005888A

磁性コアの材料としては、フェライトの他、必要に応じて金属材料を採用することがある。しかし、洞道内のような湿気が多い場所また水没する環境下で金属製の磁性コアを採用する場合、その防錆対策が必要となる。防錆対策としては、磁性コアの表面に塗装を施すことが一般的である。 In addition to ferrite, a metal material may be used as the material for the magnetic core, if necessary. However, when a metal magnetic core is used in a humid place such as inside a cave or in an environment where it is submerged in water, rust prevention measures are required. As a rust prevention measure, it is common to paint the surface of the magnetic core.

しかし、シール材等で磁気ギャップの厚さを厳密にコントロールする必要がある高周波カレントトランスの性格上、磁性コアの分割断面を塗装することはできない。そのため、磁性コアの断面付近から錆が発生するという問題がある。 However, due to the nature of high-frequency current transformers, which require strict control of the thickness of the magnetic gap using a sealant or the like, it is not possible to paint the divided sections of the magnetic core. Therefore, there is a problem that rust occurs near the cross section of the magnetic core.

磁性コアの分割断面の錆の発生を防止するため、設置後の磁性コアの断面付近にグリスを塗布したり防水テープ巻き付けたりする方法があるが、設置工数の増加や作業者の技量差により作業結果にばらつきが発生するだけでなく、防錆性能を確保できない場合もある。 In order to prevent rust from occurring on the divided cross-sections of the magnetic core, there is a method of applying grease or wrapping waterproof tape around the cross-sections of the magnetic core after installation, but this increases the number of installation steps and increases the skill level of the workers. Not only will the results vary, but the rust prevention performance may not be ensured in some cases.

したがって、本発明の目的は、分割型の磁性コアの断面付近に防錆処理を施すことなく、ケース構造により磁性コアの錆の発生を防止することが可能なカレントトランス及びカレントトランス用ケースを提供することにある。 Therefore, an object of the present invention is to provide a current transformer and a case for a current transformer that can prevent the generation of rust on the magnetic core by the case structure without applying anti-rust treatment to the cross section of the split type magnetic core. It's about doing.

上記課題を解決するため、本発明によるカレントトランスは、一次巻線としての電力線が貫通する中空部を有し、第１コア部と第２コア部との組み合わせからなる磁性コアと、前記磁性コアに二次巻線として巻回された信号取出線と、前記第１コア部を収容する第１ケース部と前記第２コア部を収容する第２ケース部との組み合わせからなるケースとを備え、前記第１ケース部のケース端面には第１の凹凸形状が設けられており、前記第１ケース部のケース端面と対向する前記第２ケース部のケース端面には前記第１の凹凸形状に噛み合う第２の凹凸形状が設けられており、前記第１ケース部のケース端面と前記第２ケース部のケース端面との間の隙間にグリス剤が充填されていることを特徴とする。 In order to solve the above problems, a current transformer according to the present invention has a hollow part through which a power line as a primary winding passes, and a magnetic core made of a combination of a first core part and a second core part; a signal take-out wire wound as a secondary winding on a case, and a case consisting of a combination of a first case part housing the first core part and a second case part housing the second core part, A first uneven shape is provided on a case end face of the first case part, and a case end face of the second case part that faces the case end face of the first case part engages with the first uneven shape. A second uneven shape is provided, and a gap between the case end face of the first case part and the case end face of the second case part is filled with a grease agent.

本発明によれば、分割型の磁性コアの断面付近に防錆処理を施すことなく、ケースを閉じるだけで磁性コアの防錆性能を確保でき、カレントトランスの信頼性の向上と設置工数の低減を図ることができる。 According to the present invention, the rust prevention performance of the magnetic core can be ensured by simply closing the case without applying rust prevention treatment near the cross section of the split type magnetic core, improving the reliability of the current transformer and reducing the number of installation steps. can be achieved.

本発明において、前記第１の凹凸形状は凹部を含み、前記第２の凹凸形状は前記凹部に入り込む凸部を含むことが好ましい。この構成により、凹部内に充填されたグリス剤を凸部が押し出して第１ケース部と第２ケース部との間の隙間をグリス剤で埋めることができ、ケース構造により磁性コアの錆の発生を防止することができる。 In the present invention, it is preferable that the first uneven shape includes a concave portion, and the second uneven shape includes a convex portion that fits into the concave portion. With this configuration, the convex part pushes out the grease filled in the recess and fills the gap between the first case part and the second case part with the grease, and the case structure prevents rust on the magnetic core. can be prevented.

本発明において、前記第１コア部は、第１及び第２のコア端面を有し、前記第２コア部は、前記第１及び第２のコア端面にそれぞれ接合される第３及び第４のコア端面とを有し、前記第１ケース部は、前記第１コア部の前記第１及び第２のコア端面をそれぞれ取り囲む第１及び第２のケース端面を有し、前記第２ケース部は、前記第２コア部の前記第３及び第４のコア端面をそれぞれ取り囲む第３及び第４のケース端面とを有することが好ましい。 In the present invention, the first core portion has first and second core end surfaces, and the second core portion has third and fourth core end surfaces joined to the first and second core end surfaces, respectively. the first case part has first and second case end faces respectively surrounding the first and second core end faces of the first core part, and the second case part has a core end face. , third and fourth case end faces respectively surrounding the third and fourth core end faces of the second core portion.

本発明において、前記第１のケース端面には第１の凹部が設けられており、前記第３のケース端面には前記第１の凹部に入り込む第１の凸部が設けられていることが好ましい。この場合において、前記第２のケース端面には第２の凹部が設けられており、前記第４のケース端面には前記第２の凹部に入り込む第２の凸部が設けられていることが好ましい。あるいは、前記第４のケース端面には第２の凹部が設けられており、前記第２のケース端面には前記第２の凹部に入り込む第２の凸部が設けられていることが好ましい。前者の場合、凹部は第１ケース部だけに設けられ、第２ケース部には設けられていないので、第１コア部だけをグリス剤の充填対象とすればよく、グリス剤の充填作業を容易に行うことができる。また後者の場合、第１及び第２ケース部の形状を同一にすることができるので、部品の共通化により量産性を向上させることができる。 In the present invention, it is preferable that the first case end face is provided with a first recess, and the third case end face is provided with a first protrusion that enters the first recess. . In this case, it is preferable that the second case end face is provided with a second recess, and the fourth case end face is provided with a second protrusion that enters the second recess. . Alternatively, it is preferable that the fourth case end face is provided with a second recess, and the second case end face is provided with a second protrusion that fits into the second recess. In the former case, since the recess is provided only in the first case part and not in the second case part, it is only necessary to fill the first core part with the grease, which facilitates the filling operation with the grease. can be done. In the latter case, since the shapes of the first and second case parts can be made the same, mass productivity can be improved by using common parts.

本発明において、前記第１のケース端面には第１の凹部と第１の凸部が設けられており、前記第３のケース端面には前記第１の凹部に入り込む第２の凹部と前記第１の凸部が入り込む第２の凹部が設けられていることが好ましい。この構成によれば、複雑な噛み合わせにより第１ケース部と第２ケース部との間の密着性を向上させることができ、防錆性能をさらに高めることができる。 In the present invention, the first case end face is provided with a first recess and a first convex part, and the third case end face is provided with a second recess that enters the first recess and a first convex part. It is preferable that a second recess into which the first projection enters is provided. According to this configuration, it is possible to improve the adhesion between the first case part and the second case part due to the complicated meshing, and it is possible to further improve the rust prevention performance.

本発明において、前記第１ケース部のケース端面と前記第２ケース部のケース端面との間の前記隙間が前記ケースの外面まで延在していることが好ましい。この構成によれば、過度な圧力を受けたグリス剤がケース内部や磁性コアの接合面に入り込むことを防ぐことができる。 In the present invention, it is preferable that the gap between the case end face of the first case part and the case end face of the second case part extends to the outer surface of the case. According to this configuration, it is possible to prevent the grease agent subjected to excessive pressure from entering the inside of the case or the joint surface of the magnetic core.

本発明において、前記凸部の先端部と前記磁性コアとの間に前記隙間が設けられており、前記隙間に前記グリス剤が充填されていることが好ましい。あるいは、前記凸部の先端部は前記磁性コアに接触していることが好ましい。 In the present invention, it is preferable that the gap is provided between the tip of the convex portion and the magnetic core, and that the gap is filled with the grease. Alternatively, it is preferable that the tip of the convex portion is in contact with the magnetic core.

また、本発明によるカレントトランス用ケースは、一次巻線としての電力線が貫通する中空部を有し、第１コア部と第２コア部との組み合わせからなる磁性コアと、前記磁性コアに二次巻線として巻回された信号取出線とを備えたカレントトランスを収容するためのケースであって、前記第１コア部を収容する第１ケース部と、前記第２コア部を収容する第２ケース部とを有し、前記第１ケース部のケース端面には第１の凹凸形状が設けられており、前記第１ケース部のケース端面と対向する前記第２ケース部のケース端面には前記第１の凹凸形状に噛み合う第２の凹凸形状が設けられており、前記第１ケース部並びに前記第２ケース部のケース端面に設けられた凹部にグリス剤が充填されていることを特徴とする。 Further, the current transformer case according to the present invention has a hollow portion through which a power line as a primary winding passes, and a magnetic core consisting of a combination of a first core portion and a second core portion; A case for accommodating a current transformer including a signal take-out line wound as a winding, the first case section accommodating the first core section and the second case section accommodating the second core section. a case portion, a first uneven shape is provided on a case end surface of the first case portion, and a case end surface of the second case portion facing the case end surface of the first case portion is provided with the first uneven shape. A second uneven shape that engages with the first uneven shape is provided, and a recess provided in the case end face of the first case part and the second case part is filled with a grease agent. .

本発明によるカレントトランス用ケースは、前記第１ケース部のケース端面と前記第２ケース部のケース端面とを接合したとき、一方のケース端面の凹部に他方のケース端面の凸部が入り込み、前記凹部内に充填されていた前記グリス剤を前記凸部が押し出し、押し出されたグリス剤がケース端面間を埋めることにより、水分の入り込みを防ぐことが好ましい。この構成によれば、ケースを閉じるだけで第１ケース部と第２ケース部との隙間をなくして磁性コアの防錆性能を確保でき、カレントトランスの信頼性の向上と設置工数の低減を図ることができる。 In the case for a current transformer according to the present invention, when the case end face of the first case part and the case end face of the second case part are joined, the convex part of the other case end face enters the concave part of one case end face, and Preferably, the convex portion pushes out the grease filled in the recess, and the pushed out grease fills the space between the end faces of the case, thereby preventing moisture from entering. According to this configuration, by simply closing the case, the gap between the first case part and the second case part can be eliminated and the rust prevention performance of the magnetic core can be ensured, improving the reliability of the current transformer and reducing the number of installation steps. be able to.

本発明によれば、設置作業者に負担をかけることなくかつ誰が施工しても均一な防錆性能を確保することが可能なカレントトランス及びカレントトランス用ケースを提供することができる。 According to the present invention, it is possible to provide a current transformer and a case for a current transformer that can ensure uniform rust prevention performance regardless of who installs the transformer without placing a burden on the installation worker.

図１は、本発明の第１の実施の形態によるカレントトランスの構造を示す略断面図である。FIG. 1 is a schematic cross-sectional view showing the structure of a current transformer according to a first embodiment of the present invention. 図２は、カレントトランスの磁性コアの分解斜視図である。FIG. 2 is an exploded perspective view of the magnetic core of the current transformer. 図３は、カレントトランスの第２ケース部を第１ケース部から切り離した状態を示す略斜視図である。FIG. 3 is a schematic perspective view showing a state where the second case part of the current transformer is separated from the first case part. 図４は、図３のカレントトランスの平面図であって、（ａ）は略上面図、（ｂ）は略側面断面図である。4 is a plan view of the current transformer shown in FIG. 3, in which (a) is a schematic top view and (b) is a schematic side sectional view. 図５は、カレントトランスの第１ケース部と第２ケース部とを組み合わせた状態を示す略側面断面図である。FIG. 5 is a schematic side sectional view showing a state in which the first case part and the second case part of the current transformer are combined. 図６は、カレントトランスの第２ケース部を第１ケース部から切り離した状態を示す略側面断面図である。FIG. 6 is a schematic side sectional view showing a state where the second case part of the current transformer is separated from the first case part. 図７は、本発明の第２の実施の形態によるカレントトランスの構造であって、第１ケース部と第２ケース部とを組み合わせた状態を示す略側面断面図である。FIG. 7 is a schematic side sectional view showing the structure of a current transformer according to a second embodiment of the present invention, showing a state in which a first case part and a second case part are combined. 図８は、本発明の第２の実施の形態によるカレントトランスの構造であって、第２ケース部を第１ケース部から切り離した状態を示す略側面断面図である。FIG. 8 is a schematic side sectional view showing the structure of a current transformer according to a second embodiment of the present invention, with the second case section separated from the first case section. 図９は、本発明の第３の実施の形態によるカレントトランスの構造の一部の拡大図であって、第１ケース部と第２ケース部とを組み合わせた状態を示す略側面断面図である。FIG. 9 is an enlarged view of a part of the structure of a current transformer according to a third embodiment of the present invention, and is a schematic side sectional view showing a state in which the first case part and the second case part are combined. . 図１０は、本発明の第３の実施の形態によるカレントトランスの構造の一部の拡大図であって、第２ケース部を第１ケース部から切り離した状態を示す略側面断面図である。FIG. 10 is an enlarged view of a part of the structure of a current transformer according to a third embodiment of the present invention, and is a schematic side sectional view showing a state in which the second case part is separated from the first case part. 図１１は、本発明の第４の実施の形態によるカレントトランスの構造の一部の拡大図であって、第１ケース部と第２ケース部２２とを組み合わせた状態を示す略側面断面図である。FIG. 11 is an enlarged view of a part of the structure of the current transformer according to the fourth embodiment of the present invention, and is a schematic side sectional view showing a state in which the first case part and the second case part 22 are combined. be. 図１２は、本発明の第４の実施の形態によるカレントトランスの構造の一部の拡大図であって、第２ケース部２２を第１ケース部２１から切り離した状態を示す略側面断面図である。FIG. 12 is an enlarged view of a part of the structure of the current transformer according to the fourth embodiment of the present invention, and is a schematic side sectional view showing a state in which the second case part 22 is separated from the first case part 21. be.

以下、添付図面を参照しながら、本発明の好ましい実施の形態について詳細に説明する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１は、本発明の第１の実施の形態によるカレントトランスの構造を示す略断面図である。また図２は、カレントトランスの磁性コアの分解斜視図である。 FIG. 1 is a schematic cross-sectional view showing the structure of a current transformer according to a first embodiment of the present invention. Further, FIG. 2 is an exploded perspective view of the magnetic core of the current transformer.

図１及び図２に示すように、本実施形態によるカレントトランス１は、トロイダルコアを半割りしてなる分割型の磁性コア１０と、磁性コア１０に二次巻線として巻回された信号取出線１５と、磁性コア１０を収容するケース２０とを備えている。ケース２０には磁性コア１０の中空部１０ａを貫通する中空部２０ａが設けられており、カレントトランス１の一次巻線としての電力線５は、ケース２０の中空部２０ａと共に磁性コア１０の中空部１０ａを貫通するように設けられている。また信号取出線１５の両端は、防水処理された配線引出口２０ｂからケース２０の外側に引き出されている。 As shown in FIGS. 1 and 2, the current transformer 1 according to the present embodiment includes a split magnetic core 10 formed by dividing a toroidal core in half, and a signal extraction coil wound around the magnetic core 10 as a secondary winding. It includes a wire 15 and a case 20 that accommodates the magnetic core 10. The case 20 is provided with a hollow portion 20a that penetrates the hollow portion 10a of the magnetic core 10, and the power line 5 as the primary winding of the current transformer 1 is inserted into the hollow portion 10a of the magnetic core 10 together with the hollow portion 20a of the case 20. It is installed so that it passes through. Further, both ends of the signal output line 15 are led out to the outside of the case 20 through a waterproof wiring outlet 20b.

磁性コア１０は金属材料からなり、ともに半円環状を有する第１コア部１１と第２コア部１２との組み合わせからなる。第１及び第２コア部１１，１２の各々は、外周面Ｓ_ｏと、内周面Ｓ_ｉと、磁性コア１０の中心軸と直交する２つの主面Ｓ_ｓ１，Ｓ_ｓ２と、トロイダルコアを半割りしたときの周方向の分割断面である２つの端面Ｓ_ａ，Ｓ_ｂとを有している。以下、第１コア部１１の２つの端面をＳ_１１ａ，Ｓ_１１ｂと称し、第２コア部１２の２つの端面をＳ_１２ａ，Ｓ_１２ｂと称する。 The magnetic core 10 is made of a metal material and is a combination of a first core part 11 and a second core part 12, both of which have a semicircular shape. Each of the first and second core portions 11 and 12 has an outer peripheral surface S _o , an inner peripheral surface S _i , two main surfaces S _s1 and S _s2 perpendicular to the central axis of the magnetic core 10, and a toroidal core. It has two end faces S _a and S _b which are circumferential cross-sections when cut in half. Hereinafter, the two end faces of the first core part 11 will be referred to as S _11a and S _11b , and the two end faces of the second core part 12 will be referred to as S _12a and S _12b .

ケース２０は、第１コア部１１を収容する第１ケース部２１と、第２コア部１２を収容する第２ケース部２２と、第１ケース部２１と第２ケース部２２とを連結する連結部２３とを有し、第１ケース部２１及び第２ケース部２２の互いに着脱自在に構成されている。ケース２０は樹脂製であってもよく、金属製であってもよい。 The case 20 includes a first case section 21 that accommodates the first core section 11, a second case section 22 that accommodates the second core section 12, and a connection that connects the first case section 21 and the second case section 22. 23, and the first case part 21 and the second case part 22 are configured to be detachable from each other. The case 20 may be made of resin or metal.

図３は、カレントトランス１の第２ケース部２２を第１ケース部２１から切り離した状態を示す略斜視図である。また、図４は、図３のカレントトランス１の平面図であって、（ａ）は略上面図、（ｂ）は略側面断面図である。図５及び図６は、カレントトランス１の略側面断面図であって、図５は、第１ケース部２１と第２ケース部２２とを組み合わせた状態、図６は、第２ケース部２２を第１ケース部２１から切り離した状態を示している。 FIG. 3 is a schematic perspective view showing a state in which the second case part 22 of the current transformer 1 is separated from the first case part 21. 4 is a plan view of the current transformer 1 shown in FIG. 3, in which (a) is a schematic top view and (b) is a schematic side sectional view. 5 and 6 are schematic side sectional views of the current transformer 1, in which FIG. 5 shows the first case part 21 and the second case part 22 combined, and FIG. 6 shows the second case part 22. A state separated from the first case part 21 is shown.

図３乃至図６示すように、第１ケース部２１は、第１コア部１１の２つの主面Ｓ_ｓ１，Ｓ_ｓ２及び外周面Ｓ_ｏをカバーする外側カバー部２１Ａと、第１コア部１１の内周面Ｓ_ｉをカバーする内側カバー部２１Ｂとで構成されており、第１コア部１１の２つの端面Ｓ_１１ａ，Ｓ_１１ｂ以外は第１ケース部２１に覆われている。第２ケース部２２は、第２コア部１２の２つの主面Ｓ_ｓ１，Ｓ_ｓ２及び外周面Ｓ_ｏをカバーする外側カバー部２２Ａと、第２コア部１２の内周面Ｓ_ｉをカバーする内側カバー部２２Ｂとで構成されており、第２コア部１２の２つの端面Ｓ_１２ａ，Ｓ_１２ｂ以外は第２ケース部２２に覆われている。第１コア部１１と第２コア部１２とを組み合わせてケース２０を閉じたとき、第１コア部１１の一方の端面Ｓ_１１ａは第２コア部１２の一方の端面Ｓ_１２ａに接合され、第１コア部１１の他方の端面Ｓ_１１ｂは第２コア部１２の他方の端面Ｓ_１２ｂに接合される。 As shown in FIGS. 3 to 6, the first case portion 21 includes an outer cover portion 21A that covers the two main surfaces S _s1 and S _s2 and the outer circumferential surface S _o of the first core portion 11, and and an inner cover part 21B that covers the inner circumferential surface S _i of the first core part 11, and the first core part 11 is covered with the first case part 21 except for the two end faces S _11a and S _11b . The second case section 22 includes an outer cover section 22A that covers the two main surfaces S _s1 and S _s2 of the second core section 12 and the outer circumferential surface S _o , and an inner circumferential surface S _i of the second core section 12 . The second core part 12 is covered with the second case part 22 except for the two end faces S _12a and S _12b . When the case 20 is closed by combining the first core part 11 and the second core part 12, one end surface _S11a of the first core part 11 is joined to one end surface _S12a of the second core part 12, The other end surface S _11b of the first core section 11 is joined to the other end surface S _12b of the second core section 12 .

第１コア部１１の２つの端面Ｓ_１１ａ，Ｓ_１１ｂと略同一平面を構成する第１ケース部２１の端面Ｓ_２１ａ，Ｓ_２１ｂ（ケース端面）には、凹部３１（第１の凹凸形状）が設けられており、凹部３１の中には規定量のグリス剤２５が充填されている。本明細書において、グリス剤２５とは適度な粘弾性を持ち、磁性コア１０の金属材料を腐食させることがない材質であればよく、グリースその他の潤滑剤に限らず、例えばシーラント剤やコーキング剤といった合成樹脂等を含むものである。凹部３１は平面視で第１コア部１１の端面Ｓ_１１ａ，Ｓ_１１ｂの周囲を取り囲むようにその略全周に設けられるが、第１ケース部２１の端面Ｓ_２１ａ，Ｓ_２１ｂの周囲の一部に設けることも可能である。 A concave portion 31 (first uneven shape) is formed on the end surfaces S _21a and _{S 21b} ₍ case end surfaces) of the first case portion 21 that are substantially coplanar with the two end surfaces S _11a and S 11b of the first core portion 11. A predetermined amount of grease 25 is filled in the recess 31 . In this specification, the grease 25 may be any material that has appropriate viscoelasticity and does not corrode the metal material of the magnetic core 10, and is not limited to grease or other lubricants, such as sealants or caulking agents. This includes synthetic resins such as. The recess 31 is provided around the entire circumference of the end surfaces S _11a and S _11b of the first core section 11 in a plan view, but it is provided around a part of the periphery of the end surfaces S _21a and S _21b of the first case section 21. It is also possible to provide the

一方、第２コア部１２の２つの端面Ｓ_１２ａ，Ｓ_１２ｂと略同一平面を構成する第２ケース部２２の２つの端面Ｓ_２２ａ，Ｓ_２２ｂ（ケース端面）には、凸部３２（第２の凹凸形状）が設けられている。凸部３２は、第２ケース部２２を第１ケース部２１と組み合わせたときに第１ケース部２１の端面Ｓ_２１ａ，Ｓ_２１ｂに設けられた凹部３１と噛み合うように構成されている。 _On the _other _hand _, the convex portion 32 (second (concave and convex shape) is provided. The convex portions 32 are configured to mesh with the recesses 31 provided in the end surfaces S _21a and S _21b of the first case portion 21 when the second case portion 22 is combined with the first case portion 21.

カレントトランス１を電力線に設置する場合、電力線が磁性コア１０の中空部１０ａを貫通するように第１コア部１１と第２コア部１２とを組み合わせる。このとき、図５に示すように、グリス剤２５を入れた第１ケース部２１の凹部３１に第２ケース部２２の凸部３２が入り込み、凹部３１内のグリス剤２５を押し出す。押し出されたグリス剤２５は、第１ケース部２１と第２ケース部２２との間の隙間２０ｇを埋めるので、磁性コア１０の接合面間への水分の入り込みを防ぐことができる。 When installing the current transformer 1 on a power line, the first core part 11 and the second core part 12 are combined so that the power line passes through the hollow part 10a of the magnetic core 10. At this time, as shown in FIG. 5, the convex part 32 of the second case part 22 enters the concave part 31 of the first case part 21 containing the grease 25, and pushes out the grease 25 in the concave part 31. Since the extruded grease 25 fills the gap 20g between the first case part 21 and the second case part 22, it is possible to prevent moisture from entering between the joint surfaces of the magnetic core 10.

また、第１ケース部２１と第２ケース部２２との間の隙間２０ｇはケース２０の外面まで延在してグリス剤の排出口を構成しており、余剰のグリス剤２５はこの隙間２０ｇからケース外に排出される。そのため、過度な圧力を受けたグリス剤２５がケース２０内部や磁性コア１０の接合面に入り込むことを防ぐことができる。本実施形態において隙間２０ｇは凸部３２の先端部と磁性コア１０との間にも存在しており、この隙間にもグリス剤２５が充填されているが、グリス剤２５には適度な圧力がかかるので、磁性コア１０の接合面を確実に保護することができる。また、適正な粘性を持つグリス剤２５を選択することで、カレントトランス１が水没してもグリス剤２５が水で流されることがなく、防錆性能を維持することができる。 Furthermore, the gap 20g between the first case part 21 and the second case part 22 extends to the outer surface of the case 20 and forms a grease outlet, and the excess grease 25 is discharged from this gap 20g. It is ejected from the case. Therefore, the grease 25 subjected to excessive pressure can be prevented from entering the inside of the case 20 or the joint surface of the magnetic core 10. In this embodiment, the gap 20g also exists between the tip of the convex portion 32 and the magnetic core 10, and this gap is also filled with the grease 25, but the grease 25 is under a moderate pressure. Therefore, the joint surface of the magnetic core 10 can be reliably protected. Furthermore, by selecting the grease 25 having an appropriate viscosity, the grease 25 will not be washed away by water even if the current transformer 1 is submerged in water, and the rust prevention performance can be maintained.

以上説明したように、本実施形態によるカレントトランス１は、第１コア部１１を収容する第１ケース部２１の端面Ｓ_２１ａ，Ｓ_２１ｂに凹部３１を設け、第２コア部１２を収容する第２ケース部２２の端面Ｓ_２２ａ，Ｓ_２２ｂに凸部３２を設け、第１コア部１１と第２コア部１２とを組み合わせるために第１ケース部２１と第２ケース部２２を組み合わせたときに凸部３２が凹部３１に入り込み、凹部３１内に充填されたグリス剤２５が押し出されて第１ケース部２１の端面Ｓ２１ａ，Ｓ２１ｂと第２ケース部２２の端面Ｓ_２２ａ，Ｓ_２２ｂとの間の隙間２０ｇを埋めるので、カレントトランス１の防錆性能を高めることができる。 As explained above, the current transformer 1 according to the present embodiment has the recesses 31 provided in the end surfaces S _21a and S _21b of the first case part 21 that accommodates the first core part 11, and the recesses 31 that accommodate the second core part 12. The convex portions 32 are provided on the end surfaces S _22a and S _22b of the second case portion 22, and when the first case portion 21 and the second case portion 22 are combined in order to combine the first core portion 11 and the second core portion 12, The convex portion 32 enters the concave portion 31, and the grease 25 filled in the concave portion 31 is pushed out to form a gap between the end surfaces S21a, S21b of the first case portion 21 and the end surfaces _S22a , _S22b of the second case portion 22. Since the gap 20g is filled, the rust prevention performance of the current transformer 1 can be improved.

図７及び図８は、本発明の第２の実施の形態によるカレントトランスの構造を示す略側面断面図であって、図７は、第１ケース部２１と第２ケース部２２とを組み合わせた状態、図８は、第２ケース部２２を第１ケース部２１から切り離した状態を示している。 7 and 8 are schematic side sectional views showing the structure of a current transformer according to a second embodiment of the present invention, and FIG. 7 shows a combination of a first case part 21 and a second case part 22. FIG. 8 shows a state in which the second case part 22 is separated from the first case part 21.

図７及び図８に示すように、このカレントトランス１の特徴は、第１ケース部２１の一方の端面Ｓ_２１ａに凹部３１が形成され、他方の端面Ｓ_２１ｂには凸部３２が形成されている点にある。同様に、第１ケース部２１の一方の端面Ｓ_２１ａと対向する第２ケース部２２の一方の端面Ｓ_２２ａには凸部３２が形成され、第１ケース部２１の一方の端面Ｓ_２１ｂと対向する第２ケース部２２の他方の端面Ｓ_２２ｂには凹部３１が形成されている点にある。その他の構成は第１の実施の形態と同様である。 As shown in FIGS. 7 and 8, the current transformer 1 is characterized in that a recess 31 is formed on one end surface S _21a of the first case portion 21, and a protrusion 32 is formed on the other end surface S _21b . It is in the point where it is. Similarly, a convex portion 32 is formed on one end surface S _22a of the second case section 22, which is opposite to one end surface S _21a of the first case section 21, and is opposite to one end surface S _21b of the first case section 21. A concave portion 31 is formed in the other end surface _S22b of the second case portion 22. Other configurations are similar to those of the first embodiment.

本実施形態によるカレントトランス１は、第１の実施の形態と同様に防錆性能を高めることができる。さらに、第１ケース部２１と第２ケース部２２とを同一形状にすることができ、部品の共通化により量産性を向上させることができる。 The current transformer 1 according to this embodiment can improve the rust prevention performance similarly to the first embodiment. Furthermore, the first case part 21 and the second case part 22 can be made to have the same shape, and mass productivity can be improved by using common parts.

図９及び図１０は、本発明の第３の実施の形態によるカレントトランスの構造の一部を拡大して示す略側面断面図であって、図９は、第１ケース部２１と第２ケース部２２とを組み合わせた状態、図１０は、第２ケース部２２を第１ケース部２１から切り離した状態を示している。 9 and 10 are schematic side sectional views showing an enlarged part of the structure of a current transformer according to a third embodiment of the present invention, and FIG. 9 shows a first case part 21 and a second case part 21. 10 shows a state in which the second case part 22 is separated from the first case part 21. FIG.

図９及び図１０に示すように、このカレントトランス１の特徴は、第１ケース部２１側の一方及び他方の端面Ｓ_２１ａ，Ｓ_２１ｂに凹部３１ｍと凸部３２ｍの両方が形成され、第２ケース部２２側の一方及び他方の端面Ｓ_２２ａ，Ｓ_２２ｂには第１ケース部２１側と噛み合う凸部３２ｎと凹部３１ｎの両方が設けられている点にある。第１ケース部２１と第２ケース部２２とを組み合わせたとき、第１ケース部２１の凸部３２ｍは第２ケース部２２の凹部３１ｎに入り込み、凹部３１ｎ内のグリス剤２５を押し出す。また第２ケース部２２の凸部３２ｎは第１ケース部２１の凹部３１ｍに入り込み、凹部３１ｍ内のグリス剤２５を押し出す。その他の構成は第１の実施の形態と同様である。本実施形態によるカレントトランス１は、複雑な噛み合わせにより第１ケース部２１と第２ケース部２２との間の密着性を向上させることができ、防錆性能をさらに高めることができる。 As shown in FIGS. 9 and 10, the current transformer 1 is characterized in that both a recess 31m and a projection 32m are formed on one and the other end surfaces S _21a and S _21b on the first case portion 21 side, and the second One and the other end surfaces S _22a and S _22b on the case portion 22 side are provided with both a convex portion 32n and a recessed portion 31n that engage with the first case portion 21 side. When the first case part 21 and the second case part 22 are combined, the convex part 32m of the first case part 21 enters the concave part 31n of the second case part 22, and pushes out the grease 25 inside the concave part 31n. Further, the convex portion 32n of the second case portion 22 enters the concave portion 31m of the first case portion 21, and pushes out the grease 25 within the concave portion 31m. Other configurations are similar to those of the first embodiment. The current transformer 1 according to this embodiment can improve the adhesion between the first case part 21 and the second case part 22 due to the complicated meshing, and can further improve the rust prevention performance.

図１１及び図１２は、本発明の第４の実施の形態によるカレントトランスの構造の一部を拡大して示す略側面断面図であって、図１１は、第１ケース部２１と第２ケース部２２とを組み合わせた状態、図１２は、第２ケース部２２を第１ケース部２１から切り離した状態を示している。 11 and 12 are schematic side sectional views showing an enlarged part of the structure of a current transformer according to a fourth embodiment of the present invention, and FIG. 11 shows a first case part 21 and a second case part 21. 12 shows a state in which the second case part 22 is separated from the first case part 21. FIG.

図１１及び図１２に示すように、このカレントトランス１の特徴は、第２ケース部２２側に設けられた凸部３２の先端部と磁性コア１０との間に隙間がなく、凸部３２の先端部が磁性コア１０に密着している点にある。その他の構成は第１の実施の形態と実質的に同一である。本実施形態によるカレントトランス１は、第１の実施の形態と同様に防錆性能を高めることができる。 As shown in FIGS. 11 and 12, the feature of this current transformer 1 is that there is no gap between the tip of the convex part 32 provided on the second case part 22 side and the magnetic core 10, The tip is in close contact with the magnetic core 10. The other configurations are substantially the same as the first embodiment. The current transformer 1 according to this embodiment can improve the rust prevention performance similarly to the first embodiment.

以上、本発明の好ましい実施形態について説明したが、本発明は、上記の実施形態に限定されることなく、本発明の主旨を逸脱しない範囲で種々の変更が可能であり、それらも本発明の範囲内に包含されるものであることはいうまでもない。 Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention. Needless to say, it is included within the scope.

例えば、上記実施形態において磁性コア１０は円形の環状コアであるが、矩形の環状コアであってもよい。また、上記実施形態においてケース２０は矩形のケースであるが、円形のケースであってもよい。 For example, although the magnetic core 10 is a circular annular core in the above embodiment, it may be a rectangular annular core. Further, although the case 20 is a rectangular case in the above embodiment, it may be a circular case.

１カレントトランス
５電力線
１０磁性コア
１０ａ磁性コアの中空部
１１第１コア部
１２第２コア部
１５信号取出線
２０ケース
２０ａケースの中空部
２０ｂ配線引出口
２０ｇ隙間
２１第１ケース部
２１Ａ第１ケース部の外側カバー部
２１Ｂ第１ケース部の内側カバー部
２２第２ケース部
２２Ａ第２ケース部の外側カバー部
２２Ｂ第２ケース部の内側カバー部
２３連結部
２５グリス剤
３１，３１ｍ，３１ｎ凹部
３２，３２ｍ，３２ｎ凸部
Ｓ_１１ａ，Ｓ_１１ｂ第１コア部の端面
Ｓ_１２ａ，Ｓ_１２ｂ第２コア部の端面
Ｓ_２１ａ，Ｓ_２１ｂ第１ケース部の端面
Ｓ_２２ａ，Ｓ_２２ｂ第２ケース部の端面
Ｓ_ａ，Ｓ_ｂ第１及び第２コア部の端面
Ｓ_ｉ第１及び第２コア部の内周面
Ｓ_ｏ第１及び第２コア部の外周面
Ｓ_ｓ１，Ｓ_ｓ２第１及び第２コア部の主面 1 Current transformer 5 Power line 10 Magnetic core 10a Hollow part of magnetic core 11 First core part 12 Second core part 15 Signal take-out line 20 Case 20a Hollow part 20b of case Wiring outlet 20g Gap 21 First case part 21A First case Outer cover part 21B of the first case part Inner cover part 22 of the first case part Second case part 22A Outer cover part 22B of the second case part Inner cover part 23 of the second case part Connecting part 25 Grease agent 31, 31m, 31n Recessed part 32 , 32m, 32n Convex portion S _11a , S _11b End face of first core part S _12a , S _12b End face of second core part S _21a , S _21b End face of first case part S _22a , S _22b End face of second case part S _a , S _b End faces of the first and second core parts S _i Inner peripheral faces of the first and second core parts S _o Outer peripheral faces of the first and second core parts S _s1 , S _s2 First and second cores Main surface of part

Claims

A magnetic core having a hollow portion through which a power line as a primary winding passes, and consisting of a combination of a first core portion and a second core portion;
a signal take-out wire wound around the magnetic core as a secondary winding;
comprising a case consisting of a combination of a first case section that accommodates the first core section and a second case section that accommodates the second core section;
A first uneven shape is provided on a case end surface of the first case part,
A second uneven shape that engages with the first uneven shape is provided on a case end face of the second case part that is opposite to a case end face of the first case part,
The first uneven shape includes a recess surrounding a core end of the first core part,
The second uneven shape includes a convex portion that enters the concave portion,
A current transformer characterized in that a gap between a case end face of the first case part and a case end face of the second case part is filled with a grease agent.

The current transformer according to claim 1, wherein a tip of the convex portion that has entered the concave portion does not come into contact with a bottom surface of the concave portion.

The first core portion has first and second core end surfaces,
The second core portion has third and fourth core end surfaces joined to the first and second core end surfaces, respectively,
The first case part has first and second case end faces respectively surrounding the first and second core end faces of the first core part,
The current transformer according to claim 1, wherein the second case section has third and fourth case end surfaces that respectively surround the third and fourth core end surfaces of the second core section.

The first case end face is provided with a first recess surrounding the first core end face ,
4. The current transformer according to claim 3, wherein the third case end face is provided with a first protrusion that fits into the first recess.

The second case end face is provided with a second recess surrounding the second core end face ,
5. The current transformer according to claim 4, wherein the fourth case end face is provided with a second protrusion that fits into the second recess.

The fourth case end face is provided with a second recess surrounding the fourth core end face ,
5. The current transformer according to claim 4, wherein the second case end face is provided with a second protrusion that fits into the second recess.

The first case end face is provided with a first recess and a first protrusion surrounding the first core end face ,
4. The current transformer according to claim 3, wherein the third case end face is provided with a second protrusion that enters the first recess and a second recess into which the first protrusion enters.

The current transformer according to any one of claims 1 to 7, wherein the gap between the case end face of the first case part and the case end face of the second case part extends to an outer surface of the case. .

The current transformer according to claim 2, wherein the gap is provided between the tip of the convex portion and the magnetic core, and the gap is filled with the grease.

The current transformer according to claim 2, wherein a tip of the convex portion is in contact with the magnetic core.

a magnetic core having a hollow portion through which a power line as a primary winding passes, and consisting of a combination of a first core portion and a second core portion; a signal take-out wire wound around the magnetic core as a secondary winding; A case for accommodating a current transformer comprising:
a first case portion that accommodates the first core portion;
a second case part that accommodates the second core part,
A first uneven shape is provided on a case end surface of the first case part,
A second uneven shape that engages with the first uneven shape is provided on a case end face of the second case part that is opposite to a case end face of the first case part,
The first uneven shape includes a recess surrounding a core end of the first core part,
The second uneven shape includes a convex portion that enters the concave portion,
A case for a current transformer, characterized in that the recess is filled with a grease agent.

When the case end face of the first case part and the case end face of the second case part are joined, the convex part enters the concave part, and the convex part pushes out the grease filled in the concave part, 12. The current transformer case according to claim 11, wherein the extruded grease fills between the end faces of the case to prevent moisture from entering.

A method for sealing a current transformer case according to claim 11, comprising:
preparing a first case part in which the first core part is housed and a second case part in which the second core part is housed;
pouring a predetermined amount of grease into the recess;
The case end face of the first case part and the case end face of the second case part are arranged so that when the convex part enters the concave part, the grease in the recess is pushed out and the grease is filled between the case end faces. A method for sealing a case for a current transformer, comprising a step of joining the end face of the case.