JP4172634B2 - 3-phase 3-wire circuit breaker with phase loss protection - Google Patents
3-phase 3-wire circuit breaker with phase loss protection Download PDFInfo
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- JP4172634B2 JP4172634B2 JP2003052453A JP2003052453A JP4172634B2 JP 4172634 B2 JP4172634 B2 JP 4172634B2 JP 2003052453 A JP2003052453 A JP 2003052453A JP 2003052453 A JP2003052453 A JP 2003052453A JP 4172634 B2 JP4172634 B2 JP 4172634B2
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Description
【0001】
【発明の属する技術分野】
本発明は、3相3線式電路の欠相を検出して回路を遮断する3相3線式欠相保護付き回路遮断器に関する。
【0002】
【従来の技術】
従来、3相3線式欠相保護付き回路遮断器は、3相3線式電路の各相R,S,Tの導体を零相変流器に貫通し、零相変流器の出力に増幅器を接続し、この増幅器に電磁装置を接続している。また、零相変流器の一次側各相導体に変流器を設け、これらの変流器の二次巻線を開放三角回路に接続し、開放三角回路の一方の開放端子から出た導体を零相変流器に貫通させて開放三角回路の他方の開放端子へ接続し、開放三角回路の開放端子間の出力電流を利用して、3相欠相時に漏電遮断器をトリップさせるようになっている。(例えば、特許文献1参照。)。
【0003】
【特許文献1】
特開昭56−74023号公報(第2頁、第1図)
【0004】
【発明が解決しようとする課題】
しかしながら、従来の3相3線式欠相保護付き回路遮断器は導体を貫通させることができる大きさの変流器を各相に夫々設けるため、回路遮断器が大型になるという欠点があった。
【0005】
そこで上記問題点に鑑み、本発明の目的は、遮断器を小型にすることができる3相3線式欠相保護付き回路遮断器を提供することである。
【0006】
【課題を解決するための手段】
上記目的を達成するために、3相3線式電路の各線に接続した電源線から3相3線式電路の欠相を集積回路によって検出し、集積回路の出力によりトリガ回路をオンしてトリップコイルを駆動し、3相3線式電路の開閉接点を開離させる3相3線式欠相保護付き回路遮断器において、電源線の各相間に整流ダイオードとフォトカプラの発光ダイオードと抵抗器とを夫々接続し、電源線に全波整流回路を介して分圧抵抗を接続し、分圧抵抗の接続点を集積回路と、並列に接続したフォトカプラのトランジスタのコレクタとに接続し、トランジスタのエミッタをグランドラインに接続し、3相3線式電路が通電している際はフォトカプラの発光ダイオードが発光してトランジスタがオンし、分圧抵抗の分圧電圧は集積回路に予め設定したしきい値を越えず、3相3線式電路が欠相した際は欠相した相に接続されたフォトカプラの発光ダイオードが発光せずトランジスタがオフしている間、分圧抵抗の分圧電圧が集積回路のしきい値を越えて集積回路によって充電回路を充電し、充電回路が既定値まで充電されると集積回路はトリガ回路をオンし、トリップコイルを駆動させて開閉接点を開離させることを特徴とする。
【0007】
【発明の実施の形態】
3相3線式電路が欠相していない場合、3相3線式電路の各相間に電源線によって接続した整流ダイオードとフォトカプラの発光ダイオードと抵抗器とに通電すると、集積回路の端子に入力される分圧抵抗の分圧電圧はフォトカプラのトランジスタのオンによって予め設定した欠相判定基準のしきい値を越えないため、トリップコイルは駆動せず3相3線式電路は遮断しない。また、3相3線式電路の1相が欠相した場合、フォトカプラのうち2つがオフし、その間、集積回路の端子にはしきい値を越える分圧抵抗の分圧電圧が印加される。このとき、集積回路はコンデンサを充電し、コンデンサが既定値まで充電されると集積回路はトリガ信号を出力してサイリスタをオンし、トリップコイルが励磁駆動して開閉接点が開離し、3相3線式電路が遮断する。
【0008】
【実施例】
本発明に係る3相3線式欠相保護付き回路遮断器の一実施例を図1及び図2の添付図面に基づいて説明する。
【0009】
3相3線式欠相保護付き回路遮断器1は、3相3線式電路R,S,Tの各線に電源線2を接続し、電源線2の各相間に、直列接続した整流ダイオードD1とフォトカプラP1の発光ダイオードと抵抗器R1、整流ダイオードD2とフォトカプラP2の発光ダイオードと抵抗器R2、整流ダイオードD3とフォトカプラP3の発光ダイオードと抵抗器R3とを接続し、更に電源線2に全波整流回路3が接続されている。全波整流回路3の出力端間には3相3線式電路R,S,Tの開閉接点4を開離させるためのトリップコイルTCと、トリップコイルTCを駆動させるためのトリガ回路としてのサイリスタSCRが直列に接続され、サイリスタSCRのゲートは過電圧検出機能を備えた集積回路ICの8番端子に接続されている。また、全波整流回路3からトリップコイルTCを介して集積回路ICに接続した電源ライン5に降圧用の抵抗器R4が接続され、電源ライン5とグランドライン6間に平滑コンデンサC1と、定電圧ダイオードZDと、分圧抵抗R5,R6が接続されている。分圧抵抗R5,R6の接続点7は集積回路ICの11番端子と、フォトカプラP1〜P3のトランジスタのコレクタとに接続され、トランジスタのエミッタはグランドライン7に接続されている。集積回路ICの10番端子とグランドライン間には充電回路としてのコンデンサC2が接続されている。
【0010】
3相3線式電路R,S,Tが正常に通電している場合、即ち、欠相していない場合は図2(a)のP1〜P3電流波形で分かるようにフォトカプラP1〜P3は電流波形の位相が120゜ずれた状態で順に通電しており、常に何れかの発光ダイオードとトランジスタがオンしている。また、全波整流回路3と抵抗器R4と平滑コンデンサC1と定電圧ダイオードZDとで交流電圧を降圧した直流電圧に変換し、分圧抵抗R5,R6の接続点7には集積回路ICが過電圧検出と判断するしきい値を越える電圧が発生しているが、トランジスタのオンにより、図2(b)の11番端子電圧波形で分かるように集積回路ICの11番端子にはしきい値を越える電圧は印加されない。よって、集積回路ICはトリガ信号を出力せず、サイリスタSCRがオンしないのでトリップコイルTCは駆動せず、3相3線式電路R,S,Tは遮断しない。
【0011】
また、3相3線式電路R,S,Tの1相が欠相した場合、図2(a)のP1〜P3電流波形で分かるように欠相した相に接続された2つのフォトカプラはオンせず、1つのフォトカプラだけしかオンしない。よって、2つのトランジスタがオンしないので、この2つのトランジスタがオフしている間、集積回路ICの11番端子にしきい値を越える分圧抵抗R5,R6の分圧電圧が印加される。これを受けて集積回路ICは図2(c)の10番端子電圧波形に示すようにコンデンサC2を充電する。そしてコンデンサC2が既定値まで充電されると図2(d)の8番端子電圧波形に示すように集積回路ICの8番端子からトリガ信号を出力してサイリスタSCRをオンし、トリップコイルTCが励磁駆動して開閉接点4を開離させ、3相3線式電路R,S,Tを遮断する。
【0012】
尚、何らかの理由によりフォトカプラP1〜P3の通電が瞬時停止してもコンデンサC2が既定値まで充電されない限りトリップコイルTCが駆動しないので誤動作を防止することができる。
【0013】
また、本発明において図3に示すように集積回路ICに漏電検出機能を有するものを使用し、零相変流器8を追加することにより、少ない部品点数で簡単に3相3線式欠相保護付き漏電遮断器に変更することができる。尚、9は漏電テスト回路である。
【0014】
【発明の効果】
以上説明したように3相3線式電路の各線に接続した電源線から3相3線式電路の欠相を集積回路によって検出し、集積回路の出力によりトリガ回路をオンしてトリップコイルを駆動し、3相3線式電路の開閉接点を開離させる3相3線式欠相保護付き回路遮断器において、電源線の各相間に整流ダイオードとフォトカプラの発光ダイオードと抵抗器とを夫々接続し、電源線に全波整流回路を介して分圧抵抗を接続し、分圧抵抗の接続点を集積回路と、並列に接続したフォトカプラのトランジスタのコレクタとに接続し、トランジスタのエミッタをグランドラインに接続し、3相3線式電路が通電している際はフォトカプラの発光ダイオードが発光してトランジスタがオンし、分圧抵抗の分圧電圧は集積回路に予め設定したしきい値を越えず、3相3線式電路が欠相した際は欠相した相に接続されたフォトカプラの発光ダイオード発光せずトランジスタがオフしている間、分圧抵抗の分圧電圧が集積回路のしきい値を越えて集積回路によって充電回路を充電し、充電回路が既定値まで充電されると集積回路はトリガ回路をオンし、トリップコイルを駆動させて開閉接点を開離させることにより、遮断器を小型にすることができるという効果がある。
【図面の簡単な説明】
【図1】本発明に係る3相3線式欠相保護付き回路遮断器の回路図である。
【図2】図1の回路の各部における波形図を示し、(a)はフォトカプラP1〜P3の電流波形、(b)は集積回路の11番端子電圧波形、(c)は集積回路の10番端子電圧波形、(d)は集積回路の8番端子電圧波形である。
【図3】本発明に係る3相3線式欠相保護付き回路遮断器の変形実施例である。
【符号の説明】
1…3相3線式欠相保護付き回路遮断器
2…電源線
3…全波整流回路
4…開閉接点
5…電源ライン
6…グランドライン
7…接続点
R,S,T…3相3線式電路
D1〜D3…整流ダイオード
P1〜P3…フォトカプラ
R1〜R4…抵抗器
R5,R6…分圧抵抗
TC…トリップコイル
SCR…サイリスタ
IC…集積回路
C1,C2…コンデンサ
ZD…定電圧ダイオード[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker with a three-phase three-wire type open phase protection that detects a phase loss of a three-phase three-wire type circuit and interrupts the circuit.
[0002]
[Prior art]
Conventional circuit breakers with three-phase, three-wire open-phase protection have each phase R, S, T conductor of the three-phase, three-wire circuit passed through the zero-phase current transformer to output the zero-phase current transformer. An amplifier is connected, and an electromagnetic device is connected to the amplifier. In addition, a current transformer is provided for each primary phase conductor of the zero-phase current transformer, and the secondary winding of these current transformers is connected to an open triangular circuit, and a conductor is output from one open terminal of the open triangular circuit. Is connected to the other open terminal of the open triangle circuit through the zero-phase current transformer, and the earth leakage circuit breaker is tripped when there is a three-phase phase loss using the output current between the open terminals of the open triangle circuit. It has become. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
JP 56-74023 A (2nd page, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, the conventional circuit breaker with three-phase, three-wire phase loss protection has a disadvantage that the circuit breaker becomes large because a current transformer having a size capable of penetrating the conductor is provided for each phase. .
[0005]
Accordingly, in view of the above problems, an object of the present invention is to provide a circuit breaker with a three-phase three-wire type open-phase protection that can reduce the size of the circuit breaker.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the integrated circuit detects the open phase of the three-phase three-wire circuit from the power supply line connected to each line of the three-phase three-wire circuit, turns on the trigger circuit by the output of the integrated circuit, and trips In a circuit breaker with a three-phase three-wire open phase protection that drives a coil and opens and closes a switching contact of a three-phase three-wire circuit, a rectifier diode, a light-emitting diode of a photocoupler, and a resistor between each phase of the power line Are connected to each other, a voltage dividing resistor is connected to the power supply line via a full-wave rectifier circuit, and a connection point of the voltage dividing resistor is connected to the integrated circuit and the collector of the photocoupler transistor connected in parallel. When the emitter is connected to the ground line and the 3-phase 3-wire circuit is energized, the light-emitting diode of the photocoupler emits light, the transistor is turned on, and the divided voltage of the voltage dividing resistor is preset in the integrated circuit. Threshold When the three-phase three-wire circuit is lost, the divided voltage of the voltage divider resistor is integrated while the light-emitting diode of the photocoupler connected to the lost phase does not emit light and the transistor is off. The charging circuit is charged by the integrated circuit exceeding the threshold value, and when the charging circuit is charged to the predetermined value, the integrated circuit turns on the trigger circuit and drives the trip coil to open the switching contact. And
[0007]
DETAILED DESCRIPTION OF THE INVENTION
If the three-phase three-wire circuit is not open, when the rectifier diode, photocoupler light-emitting diode, and resistor connected to each phase of the three-phase three-wire circuit through the power line are energized, the integrated circuit terminals Since the input divided voltage of the voltage dividing resistor does not exceed the threshold value of the phase loss judgment criterion set in advance by turning on the photocoupler transistor, the trip coil is not driven and the three-phase three-wire circuit is not cut off. In addition, when one phase of the three-phase three-wire circuit is lost, two of the photocouplers are turned off, and during that time, the divided voltage of the voltage dividing resistor exceeding the threshold is applied to the terminal of the integrated circuit. . At this time, the integrated circuit charges the capacitor, and when the capacitor is charged to a predetermined value, the integrated circuit outputs a trigger signal to turn on the thyristor, the trip coil is excited and the switching contact is opened, and the three-phase three Wired circuit breaks.
[0008]
【Example】
One embodiment of a circuit breaker with a three-phase three-wire phase loss protection according to the present invention will be described with reference to the accompanying drawings of FIGS.
[0009]
The
[0010]
When the three-phase three-wire electric circuits R, S, and T are normally energized, that is, when there is no phase loss, the photocouplers P1 to P3 can be seen from the P1 to P3 current waveforms in FIG. The current waveform is energized in order with the phase of the current waveform shifted by 120 °, and one of the light emitting diodes and the transistor is always on. Further, the full-wave rectifier circuit 3, the resistor R4, the smoothing capacitor C1, and the constant voltage diode ZD convert the AC voltage into a DC voltage that is stepped down, and the integrated circuit IC is overvoltaged at the
[0011]
In addition, when one phase of the three-phase three-wire circuit R, S, T is lost, two photocouplers connected to the lost phase as shown by the current waveforms P1 to P3 in FIG. Only one photocoupler is turned on without being turned on. Therefore, since the two transistors are not turned on, the divided voltage of the voltage dividing resistors R5 and R6 exceeding the threshold value is applied to the 11th terminal of the integrated circuit IC while the two transistors are turned off. In response to this, the integrated circuit IC charges the capacitor C2 as shown by the voltage waveform at the 10th terminal in FIG. When the capacitor C2 is charged to a predetermined value, a trigger signal is output from the eighth terminal of the integrated circuit IC to turn on the thyristor SCR as shown in the voltage waveform at the eighth terminal in FIG. Excitation drive is performed to open the
[0012]
Even if the energization of the photocouplers P1 to P3 is stopped for some reason, the trip coil TC is not driven unless the capacitor C2 is charged to a predetermined value, so that malfunction can be prevented.
[0013]
Further, in the present invention, as shown in FIG. 3, an integrated circuit IC having a leakage detecting function is used, and by adding a zero-
[0014]
【The invention's effect】
As described above, the integrated circuit detects the open phase of the three-phase three-wire circuit from the power supply line connected to each line of the three-phase three-wire circuit, and the trigger circuit is turned on by the output of the integrated circuit to drive the trip coil. In a circuit breaker with three-phase three-wire open-phase protection that opens and closes the switching contact of the three-phase three-wire circuit, a rectifier diode, a photocoupler light emitting diode, and a resistor are connected between each phase of the power line. Then, a voltage dividing resistor is connected to the power supply line via a full-wave rectifier circuit, the node of the voltage dividing resistor is connected to the integrated circuit and the collector of the photocoupler transistor connected in parallel, and the emitter of the transistor is grounded When the three-phase three-wire circuit is connected to the line, the light-emitting diode of the photocoupler emits light, the transistor is turned on, and the divided voltage of the voltage dividing resistor has a preset threshold value in the integrated circuit. Not over When the three-phase three-wire circuit is lost, the light-emitting diode of the photocoupler connected to the lost phase does not emit light, and the divided voltage of the voltage dividing resistor is the threshold of the integrated circuit while the transistor is off. The charging circuit is charged by the integrated circuit beyond the limit value, and when the charging circuit is charged to the predetermined value, the integrated circuit turns on the trigger circuit and drives the trip coil to open the switching contact, thereby reducing the size of the circuit breaker. There is an effect that can be made.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a circuit breaker with a three-phase, three-wire phase loss protection according to the present invention.
2 is a waveform diagram in each part of the circuit of FIG. 1, where (a) is a current waveform of photocouplers P1 to P3, (b) is a voltage waveform at the 11th terminal of the integrated circuit, and (c) is 10 of the integrated circuit. No. terminal voltage waveform, (d) is the No. 8 terminal voltage waveform of the integrated circuit.
FIG. 3 is a modified example of a circuit breaker with a three-phase three-wire phase loss protection according to the present invention.
[Explanation of symbols]
DESCRIPTION OF
Claims (1)
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JP2003052453A JP4172634B2 (en) | 2003-02-28 | 2003-02-28 | 3-phase 3-wire circuit breaker with phase loss protection |
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JP2003052453A JP4172634B2 (en) | 2003-02-28 | 2003-02-28 | 3-phase 3-wire circuit breaker with phase loss protection |
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JP2004265644A JP2004265644A (en) | 2004-09-24 |
JP4172634B2 true JP4172634B2 (en) | 2008-10-29 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3869213A1 (en) * | 2020-02-21 | 2021-08-25 | Panasonic Intellectual Property Management Co., Ltd. | Open phase and interruption detection device for three-phase ac power supply |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4623560B2 (en) * | 2004-09-30 | 2011-02-02 | 河村電器産業株式会社 | Earth leakage breaker |
JP2008187874A (en) * | 2007-01-31 | 2008-08-14 | Densei Lambda Kk | Phase interruption detector of three-phase ac power supply |
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2003
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3869213A1 (en) * | 2020-02-21 | 2021-08-25 | Panasonic Intellectual Property Management Co., Ltd. | Open phase and interruption detection device for three-phase ac power supply |
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