JP4507988B2 - Current transformer - Google Patents

Current transformer Download PDF

Info

Publication number
JP4507988B2
JP4507988B2 JP2005166448A JP2005166448A JP4507988B2 JP 4507988 B2 JP4507988 B2 JP 4507988B2 JP 2005166448 A JP2005166448 A JP 2005166448A JP 2005166448 A JP2005166448 A JP 2005166448A JP 4507988 B2 JP4507988 B2 JP 4507988B2
Authority
JP
Japan
Prior art keywords
secondary terminal
insulating
terminal
current transformer
dimension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2005166448A
Other languages
Japanese (ja)
Other versions
JP2006344620A (en
Inventor
晃 比嘉
久義 土屋
比佐朗 大川
徹 谷水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Original Assignee
Meidensha Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meidensha Corp filed Critical Meidensha Corp
Priority to JP2005166448A priority Critical patent/JP4507988B2/en
Publication of JP2006344620A publication Critical patent/JP2006344620A/en
Application granted granted Critical
Publication of JP4507988B2 publication Critical patent/JP4507988B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Transformers For Measuring Instruments (AREA)
  • Coils Of Transformers For General Uses (AREA)

Description

本発明は、変流器に関するものであって、例えば計測器や保護継電器を動作させるために使用されるものである。   The present invention relates to a current transformer, and is used, for example, to operate a measuring instrument or a protective relay.

一般的に変流器は、高圧回路,低圧回路の大電流を、その大電流に比例した小電流に変成し、計測器や保護継電器を動作させるために使用されている。このような変流器は、1次導体からの磁束を導出する鉄心と、その導出した磁束を2次電流に変換する2次コイルと、その2次コイルおよび鉄心を被覆する絶縁層と、その絶縁層の一部に設けられ2次コイルから引出された2次端子と、を構成している。このように構成された変流器は、前記の2次端子に計測器や保護継電器を接続して使用される(例えば、特許文献1)。   In general, a current transformer is used to transform a large current in a high-voltage circuit or a low-voltage circuit into a small current proportional to the large current and operate a measuring instrument or a protective relay. Such a current transformer includes an iron core that derives a magnetic flux from a primary conductor, a secondary coil that converts the derived magnetic flux into a secondary current, an insulating layer that covers the secondary coil and the iron core, and And a secondary terminal provided in a part of the insulating layer and drawn out from the secondary coil. The current transformer configured as described above is used by connecting a measuring instrument or a protective relay to the secondary terminal (for example, Patent Document 1).

変流器の2次電流は、2次側インピーダンスに関係なく1次電流に比例する。2次端子電圧は、2次側負荷インピーダンスに比例するため、例えば2次側インピーダンスを無限大にすると、該2次端子電圧は無限に高くなる。このため、変流器の2次側を開放すると、その2次側には数千ボルトの極めて高い電圧が発生し、2次コイル,継電器等の絶縁破壊や感電事故の原因となる。
特開昭60−2003号公報。
The secondary current of the current transformer is proportional to the primary current regardless of the secondary impedance. Since the secondary terminal voltage is proportional to the secondary side load impedance, for example, when the secondary side impedance is infinite, the secondary terminal voltage becomes infinitely high. For this reason, when the secondary side of the current transformer is opened, an extremely high voltage of several thousand volts is generated on the secondary side, which causes dielectric breakdown of the secondary coil, relay, and the like and an electric shock accident.
JP-A-60-2003.

前記の絶縁破壊や感電事故等の対策として、2次端子側にアレスターを接続して高電圧を吸収する手段が一般的に採られているが、該アレスターを設けた分に応じて装置が大型化する等の恐れがあった。   As a countermeasure against the breakdown or electric shock accident, a means for absorbing a high voltage by connecting an arrester to the secondary terminal side is generally employed. There was a fear of becoming.

また、変流器は、1次電流が電源側(後述の図1中ではK方向側)から負荷側(後述の図1中ではL方向側)に流れるように定められているため、回路の電流の流れ方向に応じて、該変流器の取付け方向を設定する必要がある。一般的な変流器の2次端子は1箇所のみに設けられた構造であり、取付け方向を変化させる場合には、例えば2次端子に計測器や保護継電器等を接続するための配線の取付けが困難となる。このため、前記の取付け性を考慮して装置が大型化する等の恐れがあった。   The current transformer is determined so that the primary current flows from the power source side (K direction side in FIG. 1 described later) to the load side (L direction side in FIG. 1 described later). It is necessary to set the mounting direction of the current transformer in accordance with the current flow direction. The secondary terminal of a general current transformer has a structure provided only at one location. When changing the mounting direction, for example, attaching a wiring for connecting a measuring instrument or a protective relay to the secondary terminal It becomes difficult. For this reason, there was a fear that the apparatus would be enlarged in consideration of the above-described mounting property.

本発明は、前記課題に基づいてなされたものであり、大型化を伴うことなく、例えば計測器や保護継電器を動作させるための変流器を提供することにある。   This invention is made | formed based on the said subject, and it is providing the current transformer for operating a measuring device and a protection relay, for example, without enlarging.

本発明は、前記課題の解決を図るために、請求項1記載の発明は、1次導体からの磁束を導出する鉄心と、前記の磁束を2次電流に変換する2次コイルと、前記の鉄心および2次コイルを被覆する絶縁本体(詳細を後述する)と、その絶縁本体の一部を貫通し2次コイルと接続する2次端子と、前記の2次端子の端部であって該絶縁本体(絶縁本体の表面・裏面の両側)から露出する2次端子露出部(詳細を後述する)とを有し、前記の絶縁本体のうち2次端子が貫通する2次端子絶縁部の寸法であって該貫通方向と同方向の厚み寸法は、前記の絶縁本体のうち接地金具が取付けられる2次端子周囲絶縁部の寸法であって該貫通方向と同方向の厚み寸法よりも、薄くすることで、前記の絶縁本体を取付ける接地金具と前記2次端子露出部との間にギャップを確保したことを特徴とする。 In order to solve the above-mentioned problems, the present invention provides an iron core that derives a magnetic flux from a primary conductor, a secondary coil that converts the magnetic flux into a secondary current, and An insulating main body (details will be described later) covering the iron core and the secondary coil, a secondary terminal penetrating a part of the insulating main body and connected to the secondary coil, and an end of the secondary terminal , Dimensions of the secondary terminal insulating portion having a secondary terminal exposed portion (details will be described later) exposed from the insulating main body (both sides of the front and back surfaces of the insulating main body), through which the secondary terminal penetrates. The thickness dimension in the same direction as the penetration direction is the dimension of the secondary terminal peripheral insulating portion to which the grounding metal fitting is attached in the insulation main body, and is made thinner than the thickness dimension in the same direction as the penetration direction. Between the grounding bracket for attaching the insulating body and the exposed portion of the secondary terminal. Characterized in that it has secured a gap.

請求項2記載の発明は、前記の請求項1記載の発明において、絶縁本体における2次端子が貫通する2次端子絶縁部の寸法であって該貫通方向と同方向の厚み寸法は、前記の絶縁本体における2次端子絶縁部以外の寸法であって該貫通方向と同方向の厚み寸法よりも、薄いことを特徴とする。 The invention according to claim 2 is the dimension of the secondary terminal insulating portion through which the secondary terminal in the insulating body penetrates in the invention according to claim 1 , wherein the thickness dimension in the same direction as the penetration direction is It is characterized in that it is a dimension other than the secondary terminal insulating part in the insulating main body and is thinner than the thickness dimension in the same direction as the penetration direction.

請求項3記載の発明は、前記の請求項1または2記載の発明において、絶縁本体に取付けられた接地金具と2次端子露出部との間の寸法が1.5〜2.5mmで、使用電圧2500V〜5000Vで放電されることを特徴とする。 The invention according to claim 3 is used in the invention according to claim 1 or 2 , wherein the dimension between the grounding fitting attached to the insulating body and the exposed portion of the secondary terminal is 1.5 to 2.5 mm. The battery is discharged at a voltage of 2500V to 5000V.

請求項1記載の発明のような構成によれば、2次端子露出部と接地金具との間のギャップにより、アレスター等の高電圧吸収手段を用いなくとも、高電圧を吸収することができる。さらに、2次端子絶縁部の厚み寸法と、その2次端子絶縁部に隣接し接地金具が取付けられる2次端子周囲絶縁部の厚み寸法と、の差を利用してギャップを形成できるAccording to the configuration as in the first aspect of the invention , the high voltage can be absorbed by the gap between the secondary terminal exposed portion and the grounding fitting without using a high voltage absorbing means such as an arrester. Furthermore, the gap can be formed by utilizing the difference between the thickness dimension of the secondary terminal insulating part and the thickness dimension of the secondary terminal surrounding insulating part to which the grounding metal fitting is attached adjacent to the secondary terminal insulating part .

請求項2記載の発明のような構成によれば、2次端子絶縁部の厚み寸法と、絶縁本体における2次端子絶縁部以外の厚み寸法と、の差を利用してギャップを形成できる。 According to the configuration of the second aspect of the present invention, the gap can be formed by utilizing the difference between the thickness dimension of the secondary terminal insulating part and the thickness dimension of the insulating body other than the secondary terminal insulating part.

請求項3記載の発明のような構成によれば、使用電圧2500V〜5000Vでの放電に応じたギャップを形成することができる。 According to the configuration of the third aspect of the present invention, it is possible to form a gap corresponding to discharge at a working voltage of 2500 V to 5000 V.

以上示したように本発明によれば、大型化を伴うことなく、例えば計測器や保護継電器を動作させることが可能となる。   As described above, according to the present invention, for example, a measuring instrument and a protective relay can be operated without increasing the size.

特に、2次端子露出部と接地金具との間にギャップを有する構成により、変流器の2次側に発生する高電圧を簡単な構造で吸収できる。 In particular , the configuration having a gap between the secondary terminal exposed portion and the grounding metal can absorb a high voltage generated on the secondary side of the current transformer with a simple structure.

以下、本発明の実施の形態における変流器を図面等に基づいて詳細に説明する。   Hereinafter, a current transformer according to an embodiment of the present invention will be described in detail with reference to the drawings.

図1は本実施の形態における変流器(図1中では符号1)の一例の等価回路の説明図、図2は図1の変流器の構成例を説明するための構造断面図である。また、図3は図2の変流器の正面図、図4は図3の変流器を下から見た底面図、図5は図3の変流器のA−A断面図を示すものである。   FIG. 1 is an explanatory diagram of an equivalent circuit of an example of a current transformer (reference numeral 1 in FIG. 1) in the present embodiment, and FIG. 2 is a structural cross-sectional view for explaining a configuration example of the current transformer of FIG. . 3 is a front view of the current transformer of FIG. 2, FIG. 4 is a bottom view of the current transformer of FIG. 3 viewed from below, and FIG. 5 is a cross-sectional view taken along line AA of the current transformer of FIG. It is.

まず、図1に示す等価回路により本実施の形態の変流器の一例を説明する。図1において、符号2は1次導体を示すものであり、その1次導体2には電源側1次端子Kと負荷側1次端子Lとが接続され、1次電流が流れる。この1次電流による磁束は、鉄心(例えば、環状鉄心)3を通過し、該鉄心3内を循環する。符号4は2次コイルを示すものであり、前記のように鉄心3内を循環する磁束により2次電流が流れる。この2次コイル4の両端は、それぞれ電源側2次端子k2と負荷側2次端子l2に接続され、該電源側2次端子k2から負荷側2次端子l2に対して前記の2次電流が流れる。符号Eは接地を示すものであり、その接地Eと電源側2次端子k2との間には、ギャップGが設けられる。   First, an example of the current transformer of this embodiment will be described with reference to the equivalent circuit shown in FIG. In FIG. 1, reference numeral 2 denotes a primary conductor. The primary conductor 2 is connected to a power supply side primary terminal K and a load side primary terminal L, and a primary current flows. The magnetic flux generated by the primary current passes through the iron core (for example, the annular core) 3 and circulates in the iron core 3. Reference numeral 4 denotes a secondary coil, and a secondary current flows by the magnetic flux circulating in the iron core 3 as described above. Both ends of the secondary coil 4 are respectively connected to the power supply side secondary terminal k2 and the load side secondary terminal l2, and the secondary current is supplied from the power supply side secondary terminal k2 to the load side secondary terminal l2. Flowing. Symbol E indicates grounding, and a gap G is provided between the grounding E and the power supply side secondary terminal k2.

次に、図1の等価回路で示される変流器の構成例を図2〜図5により説明する。図2〜図5において、図示するような環状の鉄心(以下、環状鉄心と称する)3には、導体(例えば、線状の導体)を巻回することにより2次コイル4が形成されている。この環状鉄心3および2次コイル4には、例えば絶縁樹脂部材が被覆され、絶縁性成形体(以下、絶縁本体と称する)5が形成される。   Next, a configuration example of the current transformer shown in the equivalent circuit of FIG. 1 will be described with reference to FIGS. 2-5, the secondary coil 4 is formed by winding a conductor (for example, linear conductor) around the cyclic | annular iron core (henceforth a cyclic | annular iron core) 3 as shown in figure. . The annular core 3 and the secondary coil 4 are covered with, for example, an insulating resin member to form an insulating molded body (hereinafter referred to as an insulating main body) 5.

前記の絶縁本体5は、該絶縁本体5一端側(図中では絶縁本体5の上側)で前記の環状鉄心3および2次コイル4を被覆(絶縁樹脂部材で被覆)し内部に中空部6を有する環状の絶縁性成形体(以下、1次端子側絶縁体と称する)7と、該絶縁本体5の他端側(図中では、1次端子側絶縁体7の一部から下側)で矩形形状の絶縁性成形体(以下、2次端子側絶縁体と称する)8と、から構成されている。前記の1次端子側絶縁体7と2次端子側絶縁体8とは、例えば前記の絶縁樹脂部材により一体成形される。前記の中空部6には、1次導体2が貫通される。   The insulating body 5 is coated with the annular core 3 and the secondary coil 4 (covered with an insulating resin member) on one end side of the insulating body 5 (upper side of the insulating body 5 in the figure), and has a hollow portion 6 inside. An annular insulating molded body (hereinafter referred to as a primary terminal side insulator) 7 and an other end side of the insulating main body 5 (in the drawing, from a part of the primary terminal side insulator 7 to the lower side). And a rectangular insulating molded body (hereinafter referred to as a secondary terminal-side insulator) 8. The primary terminal side insulator 7 and the secondary terminal side insulator 8 are integrally formed of, for example, the insulating resin member. The primary conductor 2 passes through the hollow portion 6.

2次端子側絶縁体8の端部(図中では、絶縁本体5における1次端子側絶縁体7の反対側の端部)の一部には、厚み方向(すなわち、2次端子k2,l2(図中では、2次端子k2,l2および1次導体2)の貫通方向)の寸法が1次端子側絶縁体7や2次端子側絶縁体8の一部(図中では、2次端子側絶縁体8の略中央部や、後述の2次端子周囲絶縁部)における厚み方向の寸法よりも薄い部位(以下、2次端子絶縁部と称する)9が形成される。また、前記の2次端子側絶縁体8の端部において、前記の2次端子絶縁部9に隣接する箇所には、厚み方向(すなわち、2次端子k2,l2(図中では、2次端子k2,l2および1次導体2)の貫通方向)の寸法が該2次端子絶縁部9における厚み方向の寸法よりも厚い部位(図3中では、2次端子側絶縁体8の略中央部と同じ寸法;以下、2次端子周囲絶縁部と称する)16a,16bが形成される。   A part of the end portion of the secondary terminal side insulator 8 (in the drawing, the end portion of the insulating body 5 opposite to the primary terminal side insulator 7) has a thickness direction (that is, secondary terminals k2, l2). The dimension in the through direction of the secondary terminals k2 and 12 and the primary conductor 2 in the figure is a part of the primary terminal side insulator 7 and the secondary terminal side insulator 8 (in the figure, the secondary terminal A portion (hereinafter referred to as a secondary terminal insulating portion) 9 thinner than the dimension in the thickness direction in the substantially central portion of the side insulator 8 and the secondary terminal surrounding insulating portion described later is formed. Further, at the end of the secondary terminal side insulator 8, the portion adjacent to the secondary terminal insulator 9 has a thickness direction (that is, secondary terminals k2, l2 (secondary terminals in the figure). k2 and 12 and the dimension of the primary conductor 2) in the penetrating direction) is thicker than the dimension in the thickness direction of the secondary terminal insulating portion 9 (in FIG. 3, the substantially central portion of the secondary terminal side insulator 8 and The same dimensions; hereinafter referred to as secondary terminal peripheral insulating portions) 16a and 16b are formed.

2次端子側絶縁体8において、1次導体2の貫通方向(すなわち、2次端子k2,l2(図中では、2次端子k2,l2および1次導体2)の貫通方向)に対して直交する方向側の側面(2次端子絶縁部9が形成されていない面)には、例えば図3,5に示すように、固定ネジ17が取付けられる。   In the secondary terminal side insulator 8, orthogonal to the through direction of the primary conductor 2 (that is, through direction of the secondary terminals k 2, 12 (secondary terminals k 2, 12, and primary conductor 2 in the figure)). For example, as shown in FIGS. 3 and 5, a fixing screw 17 is attached to the side surface (surface on which the secondary terminal insulating portion 9 is not formed) on the direction side.

前記のように中空部6を貫通している1次導体2の1次電流により、環状鉄心3内を磁束が循環し、その循環磁束により2次コイル4に対して2次電流が流れる。前記の2次コイル4は、1次端子側絶縁体7から2次端子側絶縁体8に導出され、その端部(例えば、線状の導体から成る2次コイルの場合は、その導体の両端部)が2次端子絶縁部9に配置(例えば、端部を電源側2次端子k2,負荷側2次端子l2に接続できる位置に配置)される。   As described above, the primary current of the primary conductor 2 penetrating the hollow portion 6 causes the magnetic flux to circulate in the annular core 3, and the secondary current flows to the secondary coil 4 by the circulating magnetic flux. The secondary coil 4 is led out from the primary terminal side insulator 7 to the secondary terminal side insulator 8, and its end (for example, in the case of a secondary coil made of a linear conductor, both ends of the conductor Part) is arranged in the secondary terminal insulating part 9 (for example, arranged at a position where the end part can be connected to the power supply side secondary terminal k2 and the load side secondary terminal l2).

前記の2次端子絶縁部9において、1次導体2の貫通方向側の側面のうち一方の面(以下、絶縁体表面と称する)13側から他方の面(以下、絶縁体裏面と称する)14側に対し、図5に示すように、複数個の電源側2次端子k2と負荷側2次端子l2との各端部がそれぞれ貫通(図中では、それぞれ1個の電源側2次端子k2,負荷側2次端子l2が貫通)し、該2次端子絶縁部9の両面外側を突出するように構成されている。   In the secondary terminal insulating portion 9, one surface (hereinafter referred to as an insulator surface) 13 side to the other surface (hereinafter referred to as an insulator back surface) 14 of the side surfaces of the primary conductor 2 on the penetrating direction side. As shown in FIG. 5, the ends of the plurality of power supply side secondary terminals k2 and the load side secondary terminal l2 penetrate through each side (in the figure, one power supply side secondary terminal k2 respectively. , The load-side secondary terminal l2 passes through), and protrudes from both sides of the secondary terminal insulating portion 9.

電源側2次端子k2と負荷側2次端子l2との各端部において、2次端子絶縁部9の絶縁体表面13側の面から外周側に露出している部分(以下、2次端子露出部と称する)には取付けネジ15が装着され、この取付けネジ15には計測器や保護継電器,回路等の端子20が接続される。2次端子絶縁部9の絶縁体裏面14側の面から外周側に露出している2次端子露出部においても、絶縁体表面13側と同様に取付けネジ15を装着できると共に、計測器や保護継電器,回路等の端子20を取付けることができる。   At each end of the power supply side secondary terminal k2 and the load side secondary terminal l2, a portion of the secondary terminal insulating portion 9 exposed from the surface on the insulator surface 13 side to the outer peripheral side (hereinafter, secondary terminal exposed) A mounting screw 15 is attached to the mounting screw 15, and a terminal 20 such as a measuring instrument, a protective relay, or a circuit is connected to the mounting screw 15. In the secondary terminal exposed portion exposed from the surface on the insulator back surface 14 side of the secondary terminal insulating portion 9 to the outer peripheral side, the mounting screw 15 can be mounted in the same manner as the insulator surface 13 side, and the measuring instrument and protection Terminals 20 such as relays and circuits can be attached.

前記の2次端子絶縁部9よりも外周側に突出した2次端子周囲絶縁部16a,16bには、固定ネジ17が絶縁体表面13から絶縁体裏面14に対し貫通して設けられている。すなわち、前記の固定ネジ17は、1次導体2の貫通方向と同方向に貫通して配置されている。前記の固定ネジ17において、絶縁体裏面14側に貫通した部分には接地金具18が装着され、その接地金具18は2次端子周囲絶縁部16a,16bに固定される。前記の接地金具18と、電源側2次端子k2および負荷側2次端子l2における各2次端子露出部と、の間にはギャップGが形成される。   Fixing screws 17 are provided from the insulator surface 13 to the insulator back surface 14 in the secondary terminal peripheral insulating portions 16a and 16b protruding outward from the secondary terminal insulating portion 9. That is, the fixing screw 17 is arranged to penetrate in the same direction as the penetration direction of the primary conductor 2. In the fixing screw 17, a grounding metal 18 is attached to a portion penetrating to the insulator back surface 14, and the grounding metal 18 is fixed to the secondary terminal surrounding insulating parts 16 a and 16 b. A gap G is formed between the grounding metal fitting 18 and each secondary terminal exposed portion of the power supply side secondary terminal k2 and the load side secondary terminal l2.

以上示したように構成された変流器1によれば、その変流器1の2次側を開放した際に発生する例えば数千ボルトの極めて高い電圧は、電源側2次端子k2からギャップGに対して放電される。したがって、ギャップGが変流器1自体に設けられており、従来技術のように例えば別途アレスター等を設ける必要がなく、変流器1を小型化できる。また、前記のアレスター等の取付け作業を必要としないこと、該アレスター等を適用する場合に起こり得る取付け忘れ等は考慮する必要がないこと等により、その変流器1の取扱者(取付け作業者等)が手間をかける(例えば、神経を使う)必要が無く、取り扱いが良好である。   According to the current transformer 1 configured as described above, an extremely high voltage of, for example, several thousand volts generated when the secondary side of the current transformer 1 is opened is separated from the power source side secondary terminal k2. G is discharged. Therefore, the gap G is provided in the current transformer 1 itself, and it is not necessary to provide an additional arrester or the like as in the prior art, and the current transformer 1 can be reduced in size. In addition, the operator of the current transformer 1 (the installation operator) does not need installation work of the above-described arrester, etc., and it is not necessary to consider forgetting installation that may occur when the arrester is applied. Etc.) does not require labor (for example, using nerves), and handling is good.

さらに、変流器1を小型化するために、1次端子側絶縁体7および2次端子側絶縁体8の一部における厚み寸法よりも薄い厚み寸法をなす2次端子絶縁部9を形成し、その2次端子絶縁部9に対して電源側2次端子k2および負荷側2次端子l2を貫通させ、この電源側2次端子k2および負荷側2次端子l2と接地金具18との間にギャップGが形成されるように構成することにより、接地金具18の外周側に対する突出が該接地金具18の厚み寸法以上にならないようにし(すなわち、接地金具18の厚み寸法の分だけ突出し)、変流器1の小型化を図ることができる。   Further, in order to reduce the size of the current transformer 1, a secondary terminal insulating portion 9 having a thickness dimension smaller than the thickness dimension of a part of the primary terminal side insulator 7 and the secondary terminal side insulator 8 is formed. The power source side secondary terminal k2 and the load side secondary terminal l2 are passed through the secondary terminal insulating portion 9, and between the power source side secondary terminal k2 and the load side secondary terminal l2 and the grounding fitting 18. By configuring so that the gap G is formed, the protrusion on the outer peripheral side of the grounding metal fitting 18 is prevented from exceeding the thickness dimension of the grounding metal fitting 18 (that is, it projects by the thickness dimension of the grounding metal fitting 18). The size of the flow device 1 can be reduced.

さらにまた、取り扱い性を良好にするために、2次端子絶縁部9に設けられる電源側2次端子k2及び負荷側2次端子l2の端部を該2次端子絶縁部9の表面から露出させ、絶縁体表面13或いは絶縁体裏面14のうち何れかからでも計測器や保護継電器,回路等の端子20を接続できるようにして、取扱者(接続作業者等)による接続作業が容易になる。この場合、使用する絶縁体表面13或いは絶縁体裏面14に接地金具18を設け、ギャップGが形成された構成であれば良い。   Furthermore, in order to improve the handleability, the ends of the power supply side secondary terminal k2 and the load side secondary terminal l2 provided in the secondary terminal insulating part 9 are exposed from the surface of the secondary terminal insulating part 9. The terminal 20 such as a measuring instrument, a protective relay, or a circuit can be connected from any one of the insulator surface 13 and the insulator back surface 14, so that connection work by a handler (connection worker or the like) is facilitated. In this case, the ground metal fitting 18 may be provided on the insulator front surface 13 or the insulator back surface 14 to be used, and the gap G may be formed.

これにより、計測器や保護継電器,回路等の端子20は、絶縁体表面13或いは絶縁体裏面14のうち少なくとも何れか一方側から取付け作業ができるため、例えば該端子20の取付けのみに確保するためのスペース(余分な取付けスペース)等を必要としない。また、電源側2次端子k2及び負荷側2次端子l2の取付け箇所の変更においても、絶縁体表面13或いは絶縁体裏面14のうち何れに対しても容易に変更できる。 ギャップGにおいては、例えば使用電圧2500V〜5000Vで放電する際に、そのギャップ寸法を1.5〜2.5mmに設定する。変流器1で適用される回路は、例えば2000Vで回路の健全性が確認されるため、2000V以上で放電する必要があり、また5000V以上の場合には種々の箇所にて絶縁破壊が生じる恐れがある。このため、前記の変流器1においては、2500V〜5000Vで放電することが望ましく、この電圧で放電する場合にはギャップ寸法を前記のように1.5〜2.5mmに設定するとにより、適切に運用できる。   As a result, the terminal 20 of the measuring instrument, the protective relay, the circuit, etc. can be attached from at least one of the insulator front surface 13 and the insulator back surface 14, so that it is ensured only for the attachment of the terminal 20, for example. Space (extra installation space) is not required. In addition, even when the mounting location of the power supply side secondary terminal k2 and the load side secondary terminal l2 is changed, it can be easily changed with respect to either the insulator surface 13 or the insulator back surface 14. In the gap G, for example, when discharging at a working voltage of 2500 V to 5000 V, the gap dimension is set to 1.5 to 2.5 mm. The circuit applied in the current transformer 1 needs to be discharged at 2000 V or higher because the soundness of the circuit is confirmed at 2000 V, for example, and when 5000 V or higher, dielectric breakdown may occur at various locations. There is. For this reason, in the said current transformer 1, it is desirable to discharge by 2500V-5000V, and when discharging by this voltage, it is more appropriate by setting a gap dimension to 1.5-2.5 mm as mentioned above. Can be used.

以上のように、本実施の形態の変流器によれば、絶縁本体を貫通した複数個の2次端子の端部は該絶縁本体の外周側に引出され(すなわち端子露出部が形成され)、それら端部に対し選択的(例えば、2次端子絶縁部における絶縁体表面側,絶縁体裏面側のうち何れかからでも)に計測器や保護継電器,回路等を容易に取付けすることができ(良好な取り扱い性)、例えば2次端子の端部を入替えする場合や取付け個所を変更する場合においても、その作業を選択的に行う(例えば、2次端子絶縁部における絶縁体表面側が取付けられている場合には、その取付けを絶縁体裏面側に変更する)ことができるため、従来の変流器に設けられていた取付けスペース等は不用となる(変流器の小型化が可能)。   As described above, according to the current transformer of the present embodiment, the ends of the plurality of secondary terminals penetrating the insulating body are drawn to the outer peripheral side of the insulating body (that is, terminal exposed portions are formed). In addition, measuring instruments, protective relays, circuits, etc. can be easily attached selectively to these ends (eg, from either the insulator surface side or the insulator back surface side in the secondary terminal insulator). (Good handling), for example, when the end of the secondary terminal is replaced or when the mounting location is changed, the work is selectively performed (for example, the insulator surface side of the secondary terminal insulating portion is attached) If it is, the mounting can be changed to the back side of the insulator), so that the mounting space provided in the conventional current transformer is unnecessary (the current transformer can be miniaturized).

また、環状鉄心および2次コイルを絶縁性成形体により被覆し、その絶縁性成形体の一部に対して、2次コイルに接続された2次端子(例えば、2次コイルから引出された導体の端部)の複数個が該絶縁性成形体を貫通し、その2次端子の端部がギャップと対向配置され、2次端子の端部の高電圧をギャップで放電するように変流器を構成できる。この変流器は、単に接地固定金具等に取付けることによりギャップが形成され(すなわち、変流器自体にギャップが設けられているため、該ギャップ取付け作業が不要)、別途高電圧吸収手段(アレスター等)を設ける必要が無く(すなわち、例えば該アレスター等を適用する場合に起こり得る取付け忘れ等は考慮する必要が無く)、高電圧吸収手段を取付けする作業等を必要としない分だけ、取扱者の手間を省くことができ(例えば、取扱者が神経を使う必要が無く)、取り扱い性が良好で小型化も可能となる。   Further, the annular core and the secondary coil are covered with an insulating molded body, and a secondary terminal (for example, a conductor drawn from the secondary coil) connected to the secondary coil with respect to a part of the insulating molded body The end of the secondary terminal penetrates the insulating molded body, the end of the secondary terminal is disposed opposite the gap, and the high voltage at the end of the secondary terminal is discharged through the gap. Can be configured. In this current transformer, a gap is formed simply by attaching it to a grounding fixture or the like (that is, since the current transformer itself is provided with a gap, the work for attaching the gap is unnecessary), and a separate high voltage absorbing means (arrester) Etc.) (that is, there is no need to consider forgetting the installation that may occur when applying the arrester, etc.), and there is no need to install a high voltage absorbing means. (E.g., the operator does not need to use nerves), the handleability is good, and the size can be reduced.

以上、本発明において、記載された具体例に対してのみ詳細に説明したが、本発明の技術思想の範囲で多彩な変形および修正が可能であることは、当業者にとって明白なことであり、このような変形および修正が特許請求の範囲に属することは当然のことである。   Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention. Such variations and modifications are naturally within the scope of the claims.

本発明の実施形態に係わる変流器の一例の等価回路の説明図。Explanatory drawing of the equivalent circuit of an example of the current transformer concerning embodiment of this invention. 図1における変流器の構成例を示す構造断面図。FIG. 2 is a structural cross-sectional view illustrating a configuration example of a current transformer in FIG. 1. 図2の変流器の正面図。The front view of the current transformer of FIG. 図3の変流器を下方側から見た底面図。The bottom view which looked at the current transformer of Drawing 3 from the lower part side. 図3の変流器のA−A線からの断面図。Sectional drawing from the AA line of the current transformer of FIG.

符号の説明Explanation of symbols

1…変流器、2…1次導体、3…環状鉄心、4・‥2次コイル、5…絶縁本体、6…中空部、7・‥1次端子側絶縁部、8・‥2次端子側絶縁部、9…2次端子絶縁部、13…絶縁体表面、14…絶縁体裏面、15…取付けネジ、16a,16b…2次端子周囲絶縁部、17…固定ネジ、18…接地金具、20…端子、E・‥接地、K…電源側1次端子、L…負荷側1次端子、k2…電源側2次端子、l2…負荷側2次端子。   DESCRIPTION OF SYMBOLS 1 ... Current transformer, 2 ... Primary conductor, 3 ... Ring core, 4 ... Secondary coil, 5 ... Insulation body, 6 ... Hollow part, 7 ... Primary terminal side insulation part, 8 ... Secondary terminal Side insulation part, 9 ... secondary terminal insulation part, 13 ... insulator surface, 14 ... insulator back surface, 15 ... mounting screw, 16a, 16b ... secondary terminal peripheral insulation part, 17 ... fixing screw, 18 ... grounding metal fitting, 20 ... terminal, E ... ground, K ... power source side primary terminal, L ... load side primary terminal, k2 ... power source side secondary terminal, l2 ... load side secondary terminal.

Claims (3)

1次導体からの磁束を導出する鉄心と、前記の磁束を2次電流に変換する2次コイルと、前記の鉄心および2次コイルを被覆する絶縁本体と、
その絶縁本体の一部を貫通し2次コイルと接続する2次端子と、
前記の2次端子の端部であって該絶縁本体から露出する2次端子露出部とを有し、
前記の絶縁本体のうち2次端子が貫通する2次端子絶縁部の寸法であって該貫通方向と同方向の厚み寸法は、前記の絶縁本体のうち接地金具が取付けられる2次端子周囲絶縁部の寸法であって該貫通方向と同方向の厚み寸法よりも、薄くすることで
前記の絶縁本体を取付ける接地金具と前記2次端子露出部との間にギャップを確保した
ことを特徴とする変流器。
An iron core for deriving the magnetic flux from the primary conductor, a secondary coil for converting the magnetic flux into a secondary current, an insulating body covering the iron core and the secondary coil,
A secondary terminal that penetrates a portion of the insulating body and connects to the secondary coil;
A secondary terminal exposed portion that is an end of the secondary terminal and is exposed from the insulating body;
The dimension of the secondary terminal insulation part through which the secondary terminal penetrates among the insulation bodies, and the thickness dimension in the same direction as the penetration direction is the secondary terminal surrounding insulation part to which the grounding metal fitting is attached. The gap is secured between the grounding metal fitting for attaching the insulating body and the exposed portion of the secondary terminal by making the thickness smaller than the thickness dimension in the same direction as the penetration direction. Flutes.
前記の絶縁本体における2次端子が貫通する2次端子絶縁部の寸法であって該貫通方向と同方向の厚み寸法は、前記の絶縁本体における2次端子絶縁部以外の寸法であって該貫通方向と同方向の厚み寸法よりも、薄いことを特徴とする請求項1に記載の変流器。 The dimension of the secondary terminal insulating part through which the secondary terminal penetrates in the insulating main body, and the thickness dimension in the same direction as the penetrating direction is a dimension other than the secondary terminal insulating part in the insulating main body. The current transformer according to claim 1, wherein the current transformer is thinner than a thickness dimension in the same direction as the direction. 前記の絶縁本体に取付けられた接地金具と2次端子露出部との間の寸法が1.5〜2.5mmで、使用電圧2500V〜5000Vで放電されることを特徴とする請求項1または請求項2に記載の変流器。 2. The battery according to claim 1 , wherein a dimension between the grounding fitting attached to the insulating main body and the exposed portion of the secondary terminal is 1.5 to 2.5 mm and discharged at a working voltage of 2500 V to 5000 V. Item 3. A current transformer according to item 2 .
JP2005166448A 2005-06-07 2005-06-07 Current transformer Active JP4507988B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005166448A JP4507988B2 (en) 2005-06-07 2005-06-07 Current transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005166448A JP4507988B2 (en) 2005-06-07 2005-06-07 Current transformer

Publications (2)

Publication Number Publication Date
JP2006344620A JP2006344620A (en) 2006-12-21
JP4507988B2 true JP4507988B2 (en) 2010-07-21

Family

ID=37641389

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005166448A Active JP4507988B2 (en) 2005-06-07 2005-06-07 Current transformer

Country Status (1)

Country Link
JP (1) JP4507988B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2487555B (en) * 2011-01-26 2014-08-27 Rayleigh Instr Ltd Current transformer
CN107946026B (en) * 2017-11-21 2020-08-21 保定天威互感器有限公司 External current transformer for transformer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4317985Y1 (en) * 1966-03-31 1968-07-25
JPS62109428U (en) * 1985-12-26 1987-07-13
JPH065449A (en) * 1992-06-17 1994-01-14 Toshiba Corp Current transformer
JPH06112075A (en) * 1992-09-29 1994-04-22 Toshiba Corp Current transformer
JPH11121259A (en) * 1997-10-14 1999-04-30 Tokin Corp Current transformer and unit thereof
JPH11135347A (en) * 1997-10-30 1999-05-21 Mitsubishi Electric Corp Current transformer
JPH11260633A (en) * 1998-03-12 1999-09-24 Aisan Ind Co Ltd Overvoltage protection apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4317985Y1 (en) * 1966-03-31 1968-07-25
JPS62109428U (en) * 1985-12-26 1987-07-13
JPH065449A (en) * 1992-06-17 1994-01-14 Toshiba Corp Current transformer
JPH06112075A (en) * 1992-09-29 1994-04-22 Toshiba Corp Current transformer
JPH11121259A (en) * 1997-10-14 1999-04-30 Tokin Corp Current transformer and unit thereof
JPH11135347A (en) * 1997-10-30 1999-05-21 Mitsubishi Electric Corp Current transformer
JPH11260633A (en) * 1998-03-12 1999-09-24 Aisan Ind Co Ltd Overvoltage protection apparatus

Also Published As

Publication number Publication date
JP2006344620A (en) 2006-12-21

Similar Documents

Publication Publication Date Title
US8928449B2 (en) AC/DC planar transformer
DE112015000648T5 (en) Electric power conversion device
JP2012135199A (en) Electric motor structure against electromagnetic interference
NO338301B1 (en) Transformer with electric shielding
EP3559963B1 (en) Combined instrument transformer for hv applications.
JP4507988B2 (en) Current transformer
JP2001286152A (en) Grounding structure for inverter system
EP2117016A1 (en) Draw rod mounting arrangement for a high voltage bushing, high voltage bushing comprising such arrangement and high voltage device comprising bushing with such arrangement
US20030011362A1 (en) Current transformer
JP2017079253A (en) Printed circuit insulation structure of electronic apparatus
CA2923658C (en) Connection of at least four electric conductors
US11443887B2 (en) Planar transformer having integrated ring core
JPWO2014199725A1 (en) Power converter
JP7168542B2 (en) Power module and mass spectrometer
KR100823228B1 (en) High pressure cable draw out terminal for transformer
US10743406B2 (en) Galvanic isolation for isolation transformer
US9275793B2 (en) Current input converter
US20240332937A1 (en) Busbar connection structure
US20230260695A1 (en) A tap changer and a transformer arrangement comprising the tap changer
JP7170604B2 (en) Power generation main circuit connection device
JP4636360B2 (en) Power distribution facilities
JP7095265B2 (en) switchboard
JP2006295094A (en) Shield transformer
US7593207B2 (en) Gas-insulated switchgear assembly or component of a gas-insulated switchgear assembly having an outdoor bushing
DE102004036843B3 (en) Inductive choke coil with insulated coil(s) and associated iron core(s) and at least one connector for input and output cable, with common connector for each coil integrated into coil

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080318

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080519

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20090512

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090812

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20090820

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100302

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100323

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100413

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100426

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130514

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4507988

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140514

Year of fee payment: 4