JP2011253744A - Circuit breaker capable of detecting poor contact - Google Patents

Circuit breaker capable of detecting poor contact Download PDF

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Publication number
JP2011253744A
JP2011253744A JP2010127495A JP2010127495A JP2011253744A JP 2011253744 A JP2011253744 A JP 2011253744A JP 2010127495 A JP2010127495 A JP 2010127495A JP 2010127495 A JP2010127495 A JP 2010127495A JP 2011253744 A JP2011253744 A JP 2011253744A
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Japan
Prior art keywords
circuit
side terminal
circuit breaker
contact
power supply
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JP2010127495A
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Japanese (ja)
Inventor
Atsushi Yoshida
敦至 吉田
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Kawamura Electric Inc
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Kawamura Electric Inc
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Application filed by Kawamura Electric Inc filed Critical Kawamura Electric Inc
Priority to JP2010127495A priority Critical patent/JP2011253744A/en
Priority to KR1020110054218A priority patent/KR101214770B1/en
Priority to CN201110154026.8A priority patent/CN102280317B/en
Publication of JP2011253744A publication Critical patent/JP2011253744A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/0015—Means for testing or for inspecting contacts, e.g. wear indicator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/052—Controlling, signalling or testing correct functioning of a switch

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  • Breakers (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker which can detect poor contact of a power supply side terminal and a load side terminal with one sensor circuit.SOLUTION: A feeder line 7 and a detection line 8 are wired in parallel between a power supply side terminal 3 and a load side terminal 4. A main contact 9 is provided on the feeder line 7, and a sensor circuit 11 and a switch 12 are provided in series on the detection line 8. Based on the output from the sensor circuit 11, a control circuit 14 determines poor contact of terminal components 5 and 6, and outputs a trip command to a trip coil 20. The trip coil 20 is connected to a manual handle 23 and a switch open/close mechanism 21 by a linkage member 22. When the trip coil 20 trips the main contact 9, the open/close mechanism 21 opens the switch 12 and interrupts a current flowing to the detection line 8.

Description

本発明は、端子部の接触不良を検出するセンサ回路を備えた回路遮断器に関する。   The present invention relates to a circuit breaker including a sensor circuit that detects contact failure of a terminal portion.

回路遮断器の端子部は、ネジの緩みで端子部品同士の接触状態が不安定になると、アーク放電を伴って熱を発生する。端子部の発熱を予防するために、従来、端子部品の接触・非接触をセンサ回路で検出し、接触不良を判定したときに、主接点を引き外す回路遮断器が提案されている。例えば、特許文献１の回路遮断器は、図２に示すようなセンサ回路１１の両端を電源側端子部の端子ネジ５と端子座６に接続し、これらの端子部品の電位差に基づいて、電源側端子部の接触不良を判定している。   The terminal portion of the circuit breaker generates heat with arc discharge when the contact state between the terminal components becomes unstable due to the looseness of the screws. In order to prevent heat generation in the terminal portion, conventionally, a circuit breaker has been proposed in which contact / non-contact of a terminal component is detected by a sensor circuit and a main contact is removed when a contact failure is determined. For example, in the circuit breaker of Patent Document 1, both ends of a sensor circuit 11 as shown in FIG. 2 are connected to a terminal screw 5 and a terminal seat 6 of a power supply side terminal portion, and based on the potential difference between these terminal components, The contact failure of the side terminal portion is determined.

特開２００９−２４５８３６号公報JP 2009-245836 A

ところで、端子部品の接触不良は、ネジ端子であれば、電源側端子部に限らず、負荷側端子部でも同様に発生する。しかし、従来の回路遮断器によると、センサ回路１１を電源側端子部の２つの端子部品５，６に接続しているので、負荷側端子部でも接触不良を検出しようとすると、両方の端子部にセンサ回路を設ける必要があり、遮断器の回路構成が複雑になるという問題点があった。   By the way, if it is a screw terminal, the contact failure of a terminal component will generate | occur | produce similarly not only in a power supply side terminal part but in a load side terminal part. However, according to the conventional circuit breaker, the sensor circuit 11 is connected to the two terminal components 5 and 6 of the power supply side terminal portion. There is a problem that the circuit configuration of the circuit breaker becomes complicated because it is necessary to provide a sensor circuit.

そこで、本発明の目的は、電源側端子部と負荷側端子部の接触不良を一つのセンサ回路で検出できる回路遮断器を提供することにある。   Accordingly, an object of the present invention is to provide a circuit breaker capable of detecting a contact failure between a power supply side terminal portion and a load side terminal portion with a single sensor circuit.

上記課題を解決するために、本発明は、端子部品の接触・非接触を検出するセンサ回路を備えた回路遮断器において、電源側端子部と負荷側端子部との間に検出線を配線し、検出線上にセンサ回路とスイッチを直列に設け、スイッチを主接点より早いタイミングで開閉する開閉機構を備えたことを特徴とする。   In order to solve the above-described problems, the present invention provides a circuit breaker including a sensor circuit that detects contact / non-contact of a terminal component, wherein a detection line is provided between the power supply side terminal portion and the load side terminal portion. A sensor circuit and a switch are provided in series on the detection line, and an opening / closing mechanism for opening / closing the switch at a timing earlier than the main contact is provided.

本発明の回路遮断器によれば、センサ回路を検出線で電源側端子部と負荷側端子部とに接続したので、一つのセンサ回路で両方の端子部品の接触不良のみならず、給電線上の主接点を含む電気接続部品の接触不良も検出できる。また、主接点が開くときには、スイッチが検出線に流れる電流を遮断するので、１次−２次間の絶縁に支障を来たすことなく、遮断器各部の接触不良を的確に検出できるという効果もある。   According to the circuit breaker of the present invention, since the sensor circuit is connected to the power supply side terminal portion and the load side terminal portion by the detection line, not only the poor contact of both terminal components but also the power supply line on the single sensor circuit. It is also possible to detect poor contact of electrical connection parts including the main contact. Further, when the main contact is opened, the switch cuts off the current flowing through the detection line, so that there is an effect that the contact failure of each part of the circuit breaker can be accurately detected without hindering the primary-secondary insulation. .

本発明の一実施形態を示す回路遮断器の配線図である。It is a wiring diagram of the circuit breaker which shows one Embodiment of this invention. 従来の回路遮断器のセンサ回路を示す回路図である。It is a circuit diagram which shows the sensor circuit of the conventional circuit breaker.

以下、本発明の一実施形態を図面に基づいて説明する。図１に例示する単相三線式電路用の回路遮断器１は、遮断器ケース２の一端に３つの電源側端子部３を備え、他端に同数の負荷側端子部４が設けられている。電源側端子部３は、端子部品である端子ネジ５と端子座６を備え、電源線（図示略）を端子ネジ５で端子座６に締め付けている。同様に、負荷側端子部４は、負荷配線（図示略）を端子ネジ５で端子座６に締め付けている。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A circuit breaker 1 for a single-phase three-wire circuit illustrated in FIG. 1 includes three power supply side terminal portions 3 at one end of a circuit breaker case 2 and the same number of load side terminal portions 4 at the other end. . The power supply side terminal portion 3 includes a terminal screw 5 and a terminal seat 6 which are terminal components, and a power supply line (not shown) is fastened to the terminal seat 6 with the terminal screw 5. Similarly, the load side terminal portion 4 has a load wiring (not shown) fastened to the terminal seat 6 with a terminal screw 5.

電源側端子部３と負荷側端子部４との間には、３本の給電線（電圧線Ｌ１，Ｌ２、中性線Ｎ）７が配線されるとともに、各給電線７と並列に３本の検出線８が配線されている。給電線７上には、電路を開閉する主接点９と、過電流に感応するバイメタル１０（電圧線Ｌ１，Ｌ２のみ）とが設けられている。検出線８上には、端子部品５，６や主接点９等の接触・非接触を検出するセンサ回路１１と、検出線８に流れる電流を遮断するスイッチ１２とが直列に設けられている。   Between the power supply side terminal portion 3 and the load side terminal portion 4, three feed lines (voltage lines L 1, L 2, neutral line N) 7 are wired and three feed lines 7 are arranged in parallel. The detection lines 8 are wired. On the feeder line 7, a main contact 9 that opens and closes the electric circuit and a bimetal 10 (only the voltage lines L1 and L2) that are sensitive to overcurrent are provided. On the detection line 8, a sensor circuit 11 that detects contact / non-contact of the terminal components 5, 6, the main contact 9, etc., and a switch 12 that cuts off the current flowing through the detection line 8 are provided in series.

３つのセンサ回路１１は、統合入力回路１３を介して制御回路１４に接続されている。制御回路１４には、主接点９より２次側の電路から電源を取得する電源回路１５と、センサ回路１１の出力から平均値を求める平均値回路１６と、平均値を閾値と比較して接触不良を判定する判定回路１７と、判定結果を所定時間保持する自己保持回路１８と、その時間中にトリップ指令をトリップコイル２０に出力する出力回路１９とが設けられている。   The three sensor circuits 11 are connected to the control circuit 14 via the integrated input circuit 13. The control circuit 14 is in contact with a power supply circuit 15 that obtains power from a secondary circuit from the main contact 9, an average value circuit 16 that calculates an average value from the output of the sensor circuit 11, and compares the average value with a threshold value. A determination circuit 17 that determines a defect, a self-holding circuit 18 that holds a determination result for a predetermined time, and an output circuit 19 that outputs a trip command to the trip coil 20 during that time are provided.

スイッチ１２は、センサ回路１１と電源側端子部３との間に設けられ、開閉機構２１よって駆動される。スイッチ開閉機構２１は、連係部材２２で手動ハンドル２３とトリップコイル２０と引き外し関連部品とに連結されている。そして、トリップ指令に応答し、トリップコイル２０が主接点９を引き外し、開閉機構２１が主接点９より僅かに早いタイミングでスイッチ１２を開放するようになっている。なお、センサ回路１１は、特定の構成に限定されないが、例えば図２に示すように、フォトカプラ２３を用いた入出力絶縁型回路を使用できる。   The switch 12 is provided between the sensor circuit 11 and the power supply side terminal unit 3 and is driven by the opening / closing mechanism 21. The switch opening / closing mechanism 21 is connected to the manual handle 23, the trip coil 20, and the tripping related parts by a linkage member 22. In response to the trip command, the trip coil 20 pulls off the main contact 9, and the opening / closing mechanism 21 opens the switch 12 slightly earlier than the main contact 9. The sensor circuit 11 is not limited to a specific configuration. For example, as shown in FIG. 2, an input / output insulation type circuit using a photocoupler 23 can be used.

上記構成の回路遮断器１によれば、センサ回路１１が検出線８によって電源側および負荷側の端子部３，４に接続されているので、一つのセンサ回路１１により両方の端子部３，４において端子部品５，６の接触不良を検出できるうえ、給電線７上の主接点９を含むその他の電気接続部の接触不良も広範囲に検出できる。また、主接点９とスイッチ１２を連係させているので、給電線７の遮断時に検出線８も遮断して、１次−２次間の絶縁を確保できる。従って、簡単な構成により、遮断器各部の接触不良を的確に検出することができる。   According to the circuit breaker 1 having the above configuration, since the sensor circuit 11 is connected to the power supply side and load side terminal portions 3 and 4 by the detection line 8, both the terminal portions 3 and 4 are connected by the single sensor circuit 11. In addition, the contact failure of the terminal components 5 and 6 can be detected, and the contact failure of other electrical connection portions including the main contact 9 on the feeder 7 can be detected in a wide range. Further, since the main contact 9 and the switch 12 are linked, the detection line 8 is also cut off when the power supply line 7 is cut off, so that insulation between the primary and secondary sides can be secured. Therefore, the contact failure of each part of the circuit breaker can be accurately detected with a simple configuration.

なお、本発明の回路遮断器は、単相三線式電路のみに適用されるものではなく、単相二線式電路、三相三線式電路などの各種電路に応用できる。また、電源側および負荷側の端子構造は、電線を端子ネジで端子座に締め付ける構造のほか、電線をワンタッチで着脱可能なプラグイン構造も採用できる。その他、本発明は、上記実施形態に限定されるものではなく、発明の趣旨を逸脱しない範囲で、各部の構成を適宜に変更して実施することも可能である。   In addition, the circuit breaker of this invention is not applied only to a single-phase three-wire type electric circuit, but can be applied to various electric circuits, such as a single-phase two-wire type electric circuit and a three-phase three-wire type electric circuit. The terminal structure on the power supply side and the load side can adopt a plug-in structure in which the electric wire can be attached and detached with one touch in addition to a structure in which the electric wire is fastened to the terminal seat with a terminal screw. In addition, the present invention is not limited to the above embodiment, and can be implemented by appropriately changing the configuration of each part without departing from the spirit of the invention.

１ 回路遮断器
３ 電源側端子部
４ 負荷側端子部
５，６ 端子部品
７ 給電線
８ 検出線
９ 主接点
１１ センサ回路
１２ スイッチ
２０ トリップコイル
２１ スイッチ開閉機構 DESCRIPTION OF SYMBOLS 1 Circuit breaker 3 Power supply side terminal part 4 Load side terminal part 5, 6 Terminal components 7 Feed line 8 Detection line 9 Main contact 11 Sensor circuit 12 Switch 20 Trip coil 21 Switch opening / closing mechanism

Claims (1)

端子部品の接触・非接触を検出するセンサ回路を備えた回路遮断器において、電源側端子部と負荷側端子部との間に検出線を配線し、検出線上に前記センサ回路とスイッチを直列に設け、スイッチを主接点より早いタイミングで開閉する開閉機構を備えたことを特徴とする回路遮断器。   In a circuit breaker equipped with a sensor circuit that detects contact / non-contact of terminal parts, a detection line is wired between the power supply side terminal part and the load side terminal part, and the sensor circuit and the switch are connected in series on the detection line. A circuit breaker provided with an opening / closing mechanism for opening and closing the switch at a timing earlier than the main contact.
JP2010127495A 2010-06-03 2010-06-03 Circuit breaker capable of detecting poor contact Pending JP2011253744A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2010127495A JP2011253744A (en) 2010-06-03 2010-06-03 Circuit breaker capable of detecting poor contact
KR1020110054218A KR101214770B1 (en) 2010-06-03 2011-06-03 A circuit breaker capable of detecting contact failures
CN201110154026.8A CN102280317B (en) 2010-06-03 2011-06-03 Circuit breaker capable of detecting contact fault

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JP2010127495A JP2011253744A (en) 2010-06-03 2010-06-03 Circuit breaker capable of detecting poor contact

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JP2011253744A true JP2011253744A (en) 2011-12-15

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KR (1) KR101214770B1 (en)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3008542B1 (en) * 2013-07-09 2015-10-02 Schneider Electric Ind Sas CIRCUIT BREAKER RESET DETECTION DEVICE, ACTUATOR FOR CIRCUIT BREAKER CONTACTS SEPARATION MECHANISM, ELECTRIC CIRCUIT BREAKER AND USE OF INDUCED CURRENT FOR GENERATING REARMING INDICATION SIGNAL
EP3278349B1 (en) * 2015-03-31 2020-09-16 Eaton Intelligent Power Limited Switchgear cabinet arrangement with improved cut-off in the event of an overload

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007115572A (en) * 2005-10-21 2007-05-10 Fuji Electric Fa Components & Systems Co Ltd Switch for withstand voltage test and earth leakage breaker
JP2008305764A (en) * 2007-06-11 2008-12-18 Kawamura Electric Inc Connection failure detecting circuit of electric wire and circuit breaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001165964A (en) * 1999-12-09 2001-06-22 Mitsubishi Electric Corp Circuit breaker with current conduction information- measuring device
JP4253700B2 (en) * 2002-12-16 2009-04-15 富士電機機器制御株式会社 Earth leakage breaker
KR100616782B1 (en) * 2005-05-10 2006-08-29 송종석 Leakage current detection and interruption
JP5006123B2 (en) * 2007-07-02 2012-08-22 河村電器産業株式会社 Terminal connection failure detection circuit and circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007115572A (en) * 2005-10-21 2007-05-10 Fuji Electric Fa Components & Systems Co Ltd Switch for withstand voltage test and earth leakage breaker
JP2008305764A (en) * 2007-06-11 2008-12-18 Kawamura Electric Inc Connection failure detecting circuit of electric wire and circuit breaker

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Publication number Publication date
CN102280317B (en) 2014-04-09
CN102280317A (en) 2011-12-14
KR20110133006A (en) 2011-12-09
KR101214770B1 (en) 2012-12-21

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