JP2686071B2 - Neutral wire open phase detection circuit breaker - Google Patents
Neutral wire open phase detection circuit breakerInfo
- Publication number
- JP2686071B2 JP2686071B2 JP59277063A JP27706384A JP2686071B2 JP 2686071 B2 JP2686071 B2 JP 2686071B2 JP 59277063 A JP59277063 A JP 59277063A JP 27706384 A JP27706384 A JP 27706384A JP 2686071 B2 JP2686071 B2 JP 2686071B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- voltage
- current
- neutral
- 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.)
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- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
［技術分野］
本発明は交流単相３線若しくは交流３相４線の配電線
の中性線の断線を検出して配電線を遮断する中性線欠相
検出遮断器に関するものである。
［背景技術］
交流単相３線、交流３相４線式等の中性線を有する配
電線においてその中性線が切断、緩み等にて欠落が発生
した場合、その欠落点より負荷側の中性線を介して接続
されている負荷のバランスにより、負荷側の中性線の電
位が決定される。このような状況において負荷がアンバ
ランスとなるとき負荷には異常電圧が印加されることと
なり、負荷機器の損傷に至らしめるという欠点があっ
た。
そこで提供されたのが特公昭54−5092号公報のような
遮断器であった。ところが係る従来例は第６図に示すよ
うに中性点比較回路、動作制御回路、動作設定回路等の
処理回路Ａは仮想中性点形成回路Ｂとは別に電源回路を
必要としており、そのため回路構成が複雑化するうえに
高耐圧部が電源回路と仮想中性点形成回路Ｂの２箇所必
要とするという欠点があった。尚第６図中L1,L2は活
線、Ｎは中性線を示し、2a,2bは負荷を示す。
［発明の目的］
本発明は上述の問題点に鑑みて為されたもので、その
目的とするところは中性線の欠落を検出して配電線を遮
断し負荷の保護を図ることができ、併せて信号処理部の
電源を平滑出力電圧より得て分圧回路からなる仮想中性
点形成回路と同じ電源を供給することで構成が簡単で小
型化が可能な中性線欠相検出遮断器を提供することにあ
る。
［発明の開示］
本発明は交流単相３線、交流３相４線等の中性線を有
する配電線に挿入される開閉接点Ｓと、該開閉接点Ｓを
開成遮断する遮断駆動部１と、開閉接点Ｓと負荷2a,2b
との間で配電線の活線L1,L2に接続した全波整流器３
と、全波整流器３の出力側若しくは入力側の各活線L1,L
2に挿入された同一値のインピーダンス要素と、全波整
流器３の出力を平滑する平滑コンデンサC1と、平滑出力
電圧を等分に分圧して中性点の電位と分圧点の電位とを
同一電位に設定する分圧回路６と、上記分圧回路６の分
圧点と中性線Ｎとの間に生じる電位差にて流れる電流を
積分する電流積分回路４と、該電流積分回路４の積分出
力と予め設定した基準値ｌとを比較して積分出力が基準
値ｌを越えたことを検出すると上記遮断駆動部１を駆動
する弁別回路５とを備え、電流積分回路４及び弁別回路
５の電源を上記平滑出力電圧より得るものにおいて、上
記平滑コンデンサC0の両端に開閉接点を開成させる遮断
駆動部１の電磁コイルCLとスイッチング素子との直列回
路を接続し、弁別回路５の出力でスイッチング素子をオ
ン駆動するようにしたことを特徴とするものである。
以下実施例により説明する。
実施例１
第１図は交流単相３線の配電線に用いた実施例の回路
構成図を示し、第２図はその具体回路を示しており、遮
断駆動部１は駆動する開閉接点Ｓを交流単相３線の電源
ACと負荷2a,2bとの間に直列に挿入している。そして負
荷2a,2bと開閉接点Ｓとの間において活線L1,L2間にはダ
イオードブリッジからなる全波整流器３が接続してお
り、全波整流器３の両出力端には抵抗R1,R2を介して平
滑コンデンサC1が接続され、整流出力は平滑されるよう
になっている。抵抗R1,R2は等しい値の抵抗である。分
圧回路６は平滑出力を1/2に分圧するための回路で等し
い値の抵抗R3,R4の直列回路から構成され、その分圧出
力を電流積分回路４の入力端子I1に接続している。電流
積分回路４は上記平滑出力を電源として動作するもの
で、１対の入力端子I1,I2を備え、一方の入力端子I1に
は上述の分圧出力を、他方の入力端子I2には負荷2a,2a
と開閉接点Ｓの間の中性線Ｎを接続しており、開閉接点
Ｓと電源ACの間の中性線Ｎに欠落が生じた際に発生する
電位差で両入力端子I1,I2間に流れる電流を積分するよ
うになっている。弁別回路５は上記平滑出力を電源とす
るもので、積分出力と予め設定した基準値ｌとを比較し
て基準値ｌを積分出力が越えると出力を発生して遮断駆
動部１を駆動する。遮断駆動部１は活線L1,L2から電源
を得、弁別回路５の出力で動作し開閉接点Ｓを開成遮断
するようになっている。
次に第２図に示す具体回路で動作を説明する。今中性
線Ｎが正常状態にあるとすると、中性線Ｎと活線L1間の
電圧は第３図（ａ）に示すように、また中性線Ｎと活線
L2間の電圧は第３図（ｂ）に示すようになり、また両活
線L1,L2間の電圧Vbは第３図（ｃ）のようになってい
る。そして平滑コンデンサC1に対して対称に接続された
抵抗R1、R2及び抵抗R3,R4により電圧Vbの中点の電圧が
分圧回路６の分圧点に発生する。そのため分圧点と中性
線Ｎの間には電位差が無いため、電流積分回路４のトラ
ンジスタQ1のベース・エミッタ、高抵抗値の抵抗R8の回
路には電流が流れない状態にあり、そのため電流積分回
路４の積分出力は発生しない。
第３図（ｄ）は平滑コンデンサC1の電圧ａと、分圧点
の電圧ｂを示し、また同図（ｅ）は入力端子I1又はI2の
電圧を示す。
次に開閉接点Ｓと電源ACとの間で中性線Ｎに欠落が生
じると、欠落点より負荷2a,2b側の電位は負荷2a,2bのイ
ンピーダンスRa,Rbの比により決定される。
従って入力端子I1とI2との間の電位差VaはVa＝Vb×
［Ra/（Ra＋Rb）］−（Vb/2）で表される。但しVbは活
線L1、L2間の電圧である。第４図（ａ）は活線L1と中性
線Ｎ間の電圧を、又同図（ｂ）は活線L2と中性線Ｎ間の
電圧を、また活線L1、L2間の電圧Vbを、又同図（ｄ）は
平滑コンデンサC1の電圧ａと分圧点の電圧ｂを、更に同
図（ｅ）は入力端子I1、I2間の電位差を示す。この時電
流積分回路４のトランジスタQ1のベース・エミッタ、抵
抗R8の回路には電流が流れる。この電流はVa/R8だけの
値であるが、入力端子I2からI1に流れ正の電流はダイオ
ードD1を介して全波整流器３へ流れる。逆の負の電流時
には全波整流器３からトランジスタQ1のベース・エミッ
タ回路に（Va/R8）／（1/hFE）だけ流れ、トランジスタ
Q1のエミッタ電流がVa/R8だけ抵抗R8を通じて流れる。
この時のトランジスタQ1のコレクタ電流［Va・hFE/R
8（１＋hFE）＝Va/R8］がトランジスタQ2〜Q5等から構
成されたミラー回路の設定電流としてトランジスタQ2の
エミッタ電流が流れる。この電流が流れるとミラー回路
の特性によりトランジスタQ3のエミッタ電流が同じだけ
流れミラー回路の出力電流ＩとしてVa/R8が流れる。こ
の第４図（ｆ）は出力電流Ｉを示す。この半波の出力電
流Ｉにより積分器のコンデンサC2の両端電圧が第４図
（ｇ）に示すように上昇する。この積分出力は弁別回路
５に入力し、トランジスタQ6がオンする閾値として設定
された基準値ｌを越えるとトランジスタQ6をオンさせ
る。トランジスタQ6がオンするとトランジスタQ7がオン
し、遮断駆動部１のトランジスタQ8をオンさせる。従っ
て該トランジスタQ8を介して平滑コンデンサC1に並列接
続して遮断機構の電磁コイルCLに平滑コンデンサC1の放
電電流が励磁電流として流れて開閉接点Ｓは開成駆動さ
れ電源ACを遮断し、負荷2a,2bに異常電圧が印加される
のを防ぐのである。ここで弁別回路５の基準値ｌは弁別
回路５の出力を安定させるためにヒステリシスを持たせ
ている。つまり“H"レベルの基準値ｌはオン時のトラン
ジスタQ6のベース・エミッタ電圧VBE6×（R9＋R11）/R
11で決定され、“L"レベルの基準値ｌはVBE6＋ベース電
流IB6×R9で決定されるようになっている。つまりトラ
ンジスタQ6がオンする前はトランジスタQ11がオン状態
にあり、従って積分出力は抵抗R9、R11で分圧される。
またトランジスタQ5、Q7がオンすればトランジスタQ12
がオンするためトランジスタQ11のベース電流が遮断さ
れトランジスタQ11がオフとなり積分出力が抵抗R9を介
してトランジスタQ6のベースに接続されるのである。
尚中性線Ｎの欠落時に遮断駆動部１が動作する電圧Va
は電流積分回路４のコンデンサC2、抵抗R7により充放電
されるが、この電圧のピーク値が弁別回路５の“H"の基
準値ｌに達するときの値である。またこのCR積分により
欠落時の中性線Ｎの電圧Vaの値に応じて動作する時間が
異なるように設定できる。従って電圧Vaが低いときには
動作時間が遅く、電圧Vaが高くなると（Va＝0V〜Vbまで
変化）、動作時間が早くなることにより危険度に応じた
遮断機能を持つことになる。更に短時間の雷サージ等に
よる異常電圧で誤動作するのを防止できる。
また上記実施例の電流積分回路４では電圧Vaを抵抗R8
で除した電流Ｉは半波であったがダイオードD7を第５図
に示すように無くせば全波波形の電流となる。
［発明の効果］
本発明は交流単相３線、交流３相４線等の中性線を有
する配電線に挿入される開閉接点と、該開閉接点を開成
遮断する遮断駆動部と、開閉接点と負荷との間で配電線
の活線に接続した全波整流器と、全波整流器の出力側若
しくは入力側の各活線に挿入された同一値のインピーダ
ンス要素と、全波整流器の出力を平滑する平滑コンデン
サと、平滑出力電圧を等分に分圧して中性点の電位と分
圧点の電位とを同一電位に設定する分圧回路と、上記分
圧回路の分圧点と中性線との間に生じる電位差にて流れ
る電流を積分する電流積分回路と、該電流積分回路の積
分出力と予め設定した基準値とを比較して積分出力が基
準値を越えたことを検出すると上記遮断駆動部を駆動す
る弁別回路とを備えてあるから、中性線の欠落が生じる
と開閉接点を開成遮断することができ、結果異常電圧よ
り負荷を保護できるものであって、仮想中性点を設けて
欠相検出を行うにあたり、直流電源を出力する回路の直
流出力から中間電位を形成して仮想中性点としているの
で、信号処理部の電源を平滑出力電圧より得ることがで
き、回路構成を簡略化し、コンパクトに構成することが
でき、そのうえ電流積分回路によりサージ等による異常
電圧による誤動作も防止できるという効果を奏するもの
である。しかも、平滑コンデンサの両端に開閉接点を開
成させる遮断駆動部の励磁コイルとスイッチング素子と
の直列回路を接続し、遮断駆動部の電源も平滑出力電圧
より得るようにしてあるので、遮断駆動部の電源を別個
に設ける場合のように、フォトカプラ等の遮断駆動部と
信号処理部とを絶縁分離する構成が不要となり、回路構
成をさらに簡素化できる。Description: TECHNICAL FIELD The present invention detects a disconnection of a neutral line of an AC single-phase three-wire or an AC three-phase four-wire distribution line and disconnects the distribution line. It is related to vessels. [Background Art] In a distribution line having a neutral wire such as an AC single-phase three-wire or an AC three-phase four-wire type, when the neutral wire is cut or loosened to cause a drop, the load side The balance of the loads connected via the neutral line determines the potential of the neutral line on the load side. In such a situation, when the load becomes unbalanced, an abnormal voltage is applied to the load, which has a drawback that the load device is damaged. What was provided there was a circuit breaker as disclosed in Japanese Patent Publication No. 54-5092. However, in the conventional example, as shown in FIG. 6, the processing circuit A such as the neutral point comparison circuit, the operation control circuit, and the operation setting circuit requires a power supply circuit in addition to the virtual neutral point forming circuit B. In addition to the complicated structure, there is a drawback that the high breakdown voltage portion requires two places, the power supply circuit and the virtual neutral point forming circuit B. In FIG. 6, L 1 and L 2 are live lines, N is a neutral line, and 2a and 2b are loads. [Object of the Invention] The present invention has been made in view of the above problems, and an object of the present invention is to detect a lack of a neutral wire and shut off a distribution line to protect a load. In addition, the neutral line open-phase detection circuit breaker that is simple in configuration and can be downsized by obtaining the power source of the signal processing unit from the smoothed output voltage and supplying the same power source as the virtual neutral point forming circuit composed of the voltage dividing circuit To provide. DISCLOSURE OF THE INVENTION The present invention relates to an opening / closing contact S to be inserted into a distribution line having a neutral wire such as an AC single-phase three-wire and an AC three-phase four-wire, and a breaking drive unit 1 for opening and closing the opening / closing contact S. , Switching contacts S and loads 2a, 2b
Full-wave rectifier 3 connected to the live lines L 1 and L 2 of the distribution line between
And the live lines L 1 and L on the output side or the input side of the full-wave rectifier 3
The impedance element of the same value inserted in 2 , the smoothing capacitor C 1 that smoothes the output of the full-wave rectifier 3, the smoothed output voltage is divided into equal parts, and the potential of the neutral point and the potential of the voltage dividing point are divided into The voltage dividing circuit 6 that is set to the same potential, the current integrating circuit 4 that integrates the current flowing due to the potential difference generated between the voltage dividing point of the voltage dividing circuit 6 and the neutral line N, and the current integrating circuit 4 A discrimination circuit 5 for driving the shut-off drive unit 1 when the integrated output is compared with a preset reference value 1 and it is detected that the integrated output exceeds the reference value 1 is provided, and the current integration circuit 4 and the discrimination circuit 5 are provided. In the case of obtaining the power source of the above from the smoothed output voltage, a series circuit of the electromagnetic coil CL of the breaking drive unit 1 for opening and closing contacts and the switching element is connected to both ends of the smoothing capacitor C 0 , and the output of the discrimination circuit 5 Turn on the switching element It is characterized in. Hereinafter, an embodiment will be described. Embodiment 1 FIG. 1 shows a circuit configuration diagram of an embodiment used for an AC single-phase three-wire distribution line, and FIG. 2 shows a specific circuit thereof, and the shut-off drive unit 1 has a switching contact S to be driven. AC single-phase 3-wire power supply
It is inserted in series between the AC and the loads 2a and 2b. A full-wave rectifier 3 composed of a diode bridge is connected between the live lines L 1 and L 2 between the loads 2a and 2b and the switching contact S, and a resistor R 1 is connected to both output terminals of the full-wave rectifier 3. , R 2 is connected to the smoothing capacitor C 1 so that the rectified output is smoothed. The resistors R 1 and R 2 are resistors of equal value. The voltage dividing circuit 6 is a circuit for dividing the smoothed output into halves and is composed of a series circuit of resistors R 3 and R 4 having the same value. The divided voltage output is connected to the input terminal I 1 of the current integrating circuit 4. doing. The current integrator circuit 4 operates by using the smoothed output as a power source, and is provided with a pair of input terminals I 1 and I 2 , one input terminal I 1 of which has the above-mentioned divided voltage output and the other input terminal I 2 of which. Load 2a, 2a
The neutral line N between the switching contact S and the switching contact S is connected, and the potential difference generated when the neutral line N between the switching contact S and the power supply AC is missing occurs between both input terminals I 1 and I 2. It is designed to integrate the current flowing through. The discriminating circuit 5 uses the smoothed output as a power source, compares the integrated output with a preset reference value l, and when the integrated output exceeds the reference value l, generates an output to drive the cut-off drive section 1. The shut-off drive unit 1 obtains power from the live lines L 1 and L 2 and operates by the output of the discrimination circuit 5 to open and shut the open / close contact S. Next, the operation will be described with reference to the specific circuit shown in FIG. Assuming that the neutral line N is now in a normal state, the voltage between the neutral line N and the live line L 1 is as shown in FIG.
The voltage across L 2 is as shown in FIG. 3 (b), and the voltage Vb between both live lines L 1 and L 2 is as shown in FIG. 3 (c). Then, the voltage at the midpoint of the voltage Vb is generated at the voltage dividing point of the voltage dividing circuit 6 by the resistors R 1 and R 2 and the resistors R 3 and R 4 which are symmetrically connected to the smoothing capacitor C 1 . Therefore, since there is no potential difference between the voltage dividing point and the neutral line N, current does not flow in the circuit of the base / emitter of the transistor Q 1 of the current integrating circuit 4 and the resistor R 8 of high resistance value. Therefore, the integrated output of the current integration circuit 4 does not occur. 3 (d) shows the voltage a of the smoothing capacitor C 1 and the voltage b at the voltage dividing point, and FIG. 3 (e) shows the voltage of the input terminal I 1 or I 2 . Next, when a loss occurs in the neutral line N between the switching contact S and the power supply AC, the potential on the load 2a, 2b side from the loss point is determined by the ratio of the impedances Ra, Rb of the loads 2a, 2b. Therefore, the potential difference Va between the input terminals I 1 and I 2 is Va = Vb ×
It is represented by [Ra / (Ra + Rb)]-(Vb / 2). However, Vb is the voltage between the live lines L 1 and L 2 . FIG. 4 (a) shows the voltage between the live line L 1 and the neutral line N, and FIG. 4 (b) shows the voltage between the live line L 2 and the neutral line N, and also the live line L 1 , L 2 The voltage Vb between them, the voltage (a) of the smoothing capacitor C 1 and the voltage b at the voltage dividing point are shown in (d), and the potential difference between the input terminals I 1 and I 2 is shown in (e). At this time, a current flows in the circuit of the base / emitter of the transistor Q 1 and the resistor R 8 of the current integrating circuit 4. This current has a value of Va / R8 only, but a positive current flows from the input terminals I 2 to I 1 to the full-wave rectifier 3 via the diode D 1 . At the time of negative current of the opposite, only (Va / R 8 ) / (1 / h FE ) flows from the full-wave rectifier 3 to the base-emitter circuit of the transistor Q 1 ,
Emitter current of Q 1 is flowing through only resistor R 8 Va / R 8.
At this time, the collector current of the transistor Q 1 [Va ・ h FE / R
8 (1 + h FE ) = Va / R 8 ], the emitter current of the transistor Q 2 flows as the set current of the mirror circuit composed of the transistors Q 2 to Q 5 . When this current flows, the emitter current of the transistor Q 3 flows by the same amount due to the characteristics of the mirror circuit, and Va / R 8 flows as the output current I of the mirror circuit. FIG. 4 (f) shows the output current I. This half-wave output current I causes the voltage across the capacitor C 2 of the integrator to rise as shown in FIG. 4 (g). This integrated output is input to the discrimination circuit 5, and when the reference value 1 set as a threshold value for turning on the transistor Q 6 is exceeded, the transistor Q 6 is turned on. When the transistor Q 6 is turned on, the transistor Q 7 is turned on and the transistor Q 8 of the cutoff drive unit 1 is turned on. Therefore, the smoothing capacitor C 1 is connected in parallel through the transistor Q 8 and the discharge current of the smoothing capacitor C 1 flows as an exciting current in the electromagnetic coil CL of the cutoff mechanism, the switching contact S is driven to open, and the power supply AC is cut off. This prevents the abnormal voltage from being applied to the loads 2a and 2b. Here, the reference value 1 of the discrimination circuit 5 has a hysteresis in order to stabilize the output of the discrimination circuit 5. That "H" level of the reference value l is the base-emitter voltage V BE6 × transistor Q 6 in the ON state (R 9 + R 11) / R
11 is determined, the reference value l of "L" level is adapted to be determined by the V BE6 + base current I B6 × R 9. That is, the transistor Q 11 is in the ON state before the transistor Q 6 is turned on, and therefore the integrated output is divided by the resistors R 9 and R 11 .
If the transistors Q 5 and Q 7 are turned on, the transistor Q 12
Is turned on, the base current of the transistor Q 11 is cut off, the transistor Q 11 is turned off, and the integrated output is connected to the base of the transistor Q 6 via the resistor R 9 . The voltage Va at which the cutoff drive unit 1 operates when the neutral wire N is missing
Is charged and discharged by the capacitor C 2 and the resistor R 7 of the current integration circuit 4, and is the value when the peak value of this voltage reaches the “H” reference value 1 of the discrimination circuit 5. Further, by this CR integration, the operating time can be set to be different depending on the value of the voltage Va of the neutral line N at the time of lack. Therefore, when the voltage Va is low, the operation time is slow, and when the voltage Va is high (Va changes from 0V to Vb), the operation time is shortened, and a cutoff function according to the degree of danger is provided. Further, it is possible to prevent malfunction due to abnormal voltage due to lightning surge or the like for a short time. In the current integrating circuit 4 of the above embodiment, the voltage Va is changed to the resistance R 8
The current I divided by was a half wave, but if the diode D 7 is eliminated as shown in FIG. 5, it becomes a full wave current. [Effects of the Invention] The present invention provides a switching contact to be inserted into a distribution line having a neutral wire such as an AC single-phase three-wire and an AC three-phase four-wire, a breaking drive unit for opening and closing the switching contact, and a switching contact. Between the load and the load, the full-wave rectifier connected to the live line of the distribution line, the impedance element of the same value inserted in each live line on the output side or the input side of the full-wave rectifier, and the output of the full-wave rectifier Smoothing capacitor, a voltage dividing circuit that divides the smoothed output voltage into equal parts and sets the potential of the neutral point and the potential of the voltage dividing point to the same potential, the voltage dividing point of the voltage dividing circuit and the neutral line. If a current integrator circuit that integrates the current flowing due to the potential difference generated between the current integrator circuit and an integrated output of the current integrator circuit is compared with a preset reference value and it is detected that the integrated output exceeds the reference value, the above-mentioned cutoff is performed. It has a discriminator circuit that drives the drive unit, so it opens when the neutral line is lost. The closed contact can be opened and closed, and as a result, the load can be protected from abnormal voltage.When a virtual neutral point is provided and open phase detection is performed, the intermediate potential is output from the DC output of the circuit that outputs the DC power supply. Since it is formed as a virtual neutral point, the power supply of the signal processing unit can be obtained from the smoothed output voltage, the circuit configuration can be simplified and compacted, and the current integrator circuit causes abnormal voltage due to surge, etc. It is possible to prevent an erroneous operation due to. Moreover, since a series circuit of the exciting coil of the breaking drive unit and the switching element for opening the switching contacts is connected to both ends of the smoothing capacitor and the power supply of the breaking drive unit is also obtained from the smoothed output voltage, the breaking drive unit As in the case of separately providing a power source, a configuration for insulating and separating the shut-off driving unit such as a photocoupler from the signal processing unit is not required, and the circuit configuration can be further simplified.
【図面の簡単な説明】
第１図は本発明の実施例１の回路構成図、第２図は同上
の具体回路図、第３図、第４図は同上の動作説明の波形
図、第５図は同上使用の電流積分回路の他の例の要部回
路図、第６図は従来例の回路構成図であり、１は遮断駆
動部、2a,2bは負荷、３は全波整流器、４は電流積分回
路、５は弁別回路、６は分圧回路、R1〜R8は抵抗、C1は
平滑コンデンサ、Ｓは開閉接点、L1,L2は活線、Ｎは中
性線、Q8はトランジスタ、CLは電磁コイルである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit configuration diagram of a first embodiment of the present invention, FIG. 2 is a specific circuit diagram of the same as above, and FIGS. 3 and 4 are waveform diagrams of operation explanation of the same as above. FIG. 6 is a circuit diagram of a main part of another example of the current integrating circuit used in the same as above, and FIG. 6 is a circuit configuration diagram of a conventional example. 1 is a breaking drive unit, 2a and 2b are loads, 3 is a full-wave rectifier, 4 Is a current integrator circuit, 5 is a discrimination circuit, 6 is a voltage divider circuit, R 1 to R 8 are resistors, C 1 is a smoothing capacitor, S is a switching contact, L 1 and L 2 are live lines, N is a neutral line, Q 8 is a transistor and CL is an electromagnetic coil.
Claims (1)
電線に挿入される開閉接点と、該開閉接点を開成遮断す
る遮断駆動部と、開閉接点と負荷との間で配電線の活線
に接続した全波整流器と、全波整流器の出力側若しくは
入力側の各活線に挿入された同一値のインピーダンス要
素と、全波整流器の出力を平滑する平滑コンデンサと、
平滑出力電圧を等分に分圧して中性点の電位と分圧点の
電位とを同一電位に設定する分圧回路と、上記分圧回路
の分圧点と中性線との間に生じる電位差にて流れる電流
を積分する電流積分回路と、該電流積分回路の積分出力
と予め設定した基準値とを比較して積分出力が基準値を
越えたことを検出すると上記遮断駆動部を駆動する弁別
回路とを備え、電流積分回路及び弁別回路の電源を上記
平滑出力電圧より得る中性線欠相検出遮断器において、
上記平滑コンデンサの両端に開閉接点を開成させる遮断
駆動部の電磁コイルとスイッチング素子との直列回路を
接続し、弁別回路の出力でスイッチング素子をオン駆動
するようにしたことを特徴とする中性線欠相検出遮断
器。(57) [Claims] Switching contacts to be inserted into a distribution line having a neutral wire such as AC single-phase three-wire and AC three-phase four-wire, a breaking drive unit for opening and closing the switching contacts, and a distribution line between the switching contacts and the load Full-wave rectifier connected to the live line of, the impedance element of the same value inserted in each output line or input side of the full-wave rectifier, and a smoothing capacitor that smoothes the output of the full-wave rectifier,
It occurs between the voltage dividing circuit that divides the smoothed output voltage into equal parts and sets the potential at the neutral point and the potential at the voltage dividing point to the same potential, and between the voltage dividing point of the voltage dividing circuit and the neutral line. A current integrator circuit that integrates the current flowing due to a potential difference is compared with an integrated output of the current integrator circuit and a preset reference value, and when it is detected that the integrated output exceeds the reference value, the cutoff drive unit is driven. In the neutral line open phase detection circuit breaker, which comprises a discrimination circuit, and obtains the power source of the current integration circuit and the discrimination circuit from the smoothed output voltage,
A neutral line characterized by connecting a series circuit of an electromagnetic coil of a breaking drive unit for opening an opening / closing contact and a switching element to both ends of the smoothing capacitor, and turning on the switching element by the output of the discrimination circuit. Phase breaker detection circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59277063A JP2686071B2 (en) | 1984-12-24 | 1984-12-24 | Neutral wire open phase detection circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59277063A JP2686071B2 (en) | 1984-12-24 | 1984-12-24 | Neutral wire open phase detection circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61150611A JPS61150611A (en) | 1986-07-09 |
| JP2686071B2 true JP2686071B2 (en) | 1997-12-08 |
Family
ID=17578264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59277063A Expired - Fee Related JP2686071B2 (en) | 1984-12-24 | 1984-12-24 | Neutral wire open phase detection circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2686071B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112328B2 (en) * | 1985-01-14 | 1995-11-29 | 松下電工株式会社 | Neutral wire open phase detection circuit breaker |
| JP2625687B2 (en) * | 1986-10-31 | 1997-07-02 | ソニー株式会社 | Power supply circuit |
| JP3931818B2 (en) | 2003-02-13 | 2007-06-20 | 株式会社デンソー | Air conditioner for vehicles |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56129871A (en) * | 1980-03-14 | 1981-10-12 | Matsushita Electric Works Ltd | Detector for missing of neutral conductor |
| JPS57154068A (en) * | 1981-03-19 | 1982-09-22 | Mitsubishi Electric Corp | Phase discriminator |
-
1984
- 1984-12-24 JP JP59277063A patent/JP2686071B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61150611A (en) | 1986-07-09 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |