JPH0260411A - Circuit breaker - Google Patents
Circuit breakerInfo
- Publication number
- JPH0260411A JPH0260411A JP20935488A JP20935488A JPH0260411A JP H0260411 A JPH0260411 A JP H0260411A JP 20935488 A JP20935488 A JP 20935488A JP 20935488 A JP20935488 A JP 20935488A JP H0260411 A JPH0260411 A JP H0260411A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- overcurrent
- ground fault
- alarm
- current
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000002459 sustained effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 17
- 239000003990 capacitor Substances 0.000 description 9
- 239000004020 conductor Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、漏電警報付しゃ断器と地絡保襲付しゃ断器
を一体化した回路しゃ断器に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a circuit breaker that integrates a circuit breaker with an earth leakage alarm and a circuit breaker with earth fault protection.
第４図は特願昭６３−１７０，８２５号に開示された従
来の回路しゃ断器を簡単化して示すブロック図であり、
図において１は交流電源例えば３相交流電源、２はこの
交流電源１によって給電される負荷例えばモータ、３は
これら交流電源１と負荷２の間に接続された回路しゃ断
器である。この回路しゃ断器３は、開閉機構部４を介し
て交流電源１に接続される３相導体５ａ、５ｂ、５ｃが
ら成る主回路５と、この主回路５の各相導体５ａ、５ｂ
。FIG. 4 is a simplified block diagram of a conventional circuit breaker disclosed in Japanese Patent Application No. 170,825/1982.
In the figure, 1 is an AC power source, for example, a three-phase AC power source; 2 is a load, such as a motor, supplied with power by the AC power source 1; and 3 is a circuit breaker connected between the AC power source 1 and the load 2. This circuit breaker 3 includes a main circuit 5 consisting of three-phase conductors 5a, 5b, and 5c connected to an AC power source 1 via a switching mechanism section 4, and each phase conductor 5a, 5b of this main circuit 5.
.
５ｃにそれぞれ接続された変流器ＣＴ ａ 、 ＣＴ
ｂ ＋ＣＴｃと、これら変流器の２次側に接続されかつ
主回路５に流れる過電流およびこの過電流に至る舵の電
流を検出する過電流検出回路６と、この過電流検出回路
６の出力側に接続されかつ主回路５をしゃ断させるため
の過電流引外し特性および引外しの事前に警報を発させ
るための過電流用事前警報特性を有する過電流時限発生
回路７と、この過を九時限発生回路７の出力側に接続さ
れたトリガ回路８と、このトリガ回路８を介して過電流
検出回路６０両端間に接続される引外しコイル９と、過
電流時限発生回路７の出力側に接続されかつ事前を報信
号を発生する過電流用事前警報回路１０と、この過電流
用事前警報１０に接続されてその事前警報信号で点灯さ
れる警報手段としての過電流用事前警報表示ＬＥＤＩＩ
とを備えている。なお、過電流用事前警報回路１０は、
図失の接点出力により事前警報信号を外部にも供給する
、そしてトリガ回路８．引外しコイル９および開閉機構
部４は引外し手段を構成する。Current transformers CT a , CT connected to 5c, respectively
b +CTc, an overcurrent detection circuit 6 that is connected to the secondary side of these current transformers and detects the overcurrent flowing in the main circuit 5 and the rudder current leading to this overcurrent, and the output of this overcurrent detection circuit 6. an overcurrent time limit generation circuit 7 connected to the main circuit 5 and having an overcurrent tripping characteristic to cut off the main circuit 5 and an overcurrent advance warning characteristic to issue a warning before tripping; A trigger circuit 8 connected to the output side of the time limit generation circuit 7, a tripping coil 9 connected between both ends of the overcurrent detection circuit 60 via this trigger circuit 8, and a tripping coil 9 connected to the output side of the overcurrent time limit generation circuit 7. An overcurrent advance warning circuit 10 that is connected and generates an advance warning signal, and an overcurrent advance warning display LED II that is connected to this overcurrent advance warning 10 and is lit by the advance warning signal as a warning means.
It is equipped with Note that the overcurrent advance warning circuit 10 is
A pre-warning signal is also supplied to the outside by a contact output not shown in the figure, and a trigger circuit 8. The tripping coil 9 and the opening/closing mechanism section 4 constitute a tripping means.
第５図は、第４図に示した回路しゃ断器３の過電流引外
し特性および過電流用事前警報特性を示す曲線図である
。FIG. 5 is a curve diagram showing the overcurrent tripping characteristics and overcurrent advance warning characteristics of the circuit breaker 3 shown in FIG. 4.
従来の回路しゃ断器３は上述したように構成されており
、その動作を第４図および第５図について説明する。今
、回路しゃ断器３の開閉機構部４が閉じており、すなわ
ち引外されておらず、交流電源１から主回路５を通して
負荷２へ電流が流れているとしよう。変流器ＣＴａ、Ｃ
Ｔｂ、ＣＴｃは、その２次側に主回路電流に比例する２
次電流を流す。The conventional circuit breaker 3 is constructed as described above, and its operation will be explained with reference to FIGS. 4 and 5. Assume now that the switching mechanism section 4 of the circuit breaker 3 is closed, that is, it is not tripped, and current is flowing from the AC power source 1 through the main circuit 5 to the load 2. Current transformer CTa,C
Tb and CTc are 2 which is proportional to the main circuit current on the secondary side.
Next, apply current.
過電流検出回路６が定格電流の例えば７０％を超える′
電流を検出すると、過電流時限発生回路７は第５図に示
した過電流用事前警報特性（ＱＣ−ＰＡＬ）に応じて所
定の時間後ＫＧ報出力を出して過電流用事前警報回路１
０を作動させ、この過電流用事前警報回路１０が発生し
た事前警報信号は過電流用事前警報表示ＬＥＤＩＩを点
灯させると共に外部へ供給される。更に、過電流検出回
路６が定格電流の例えば１００％、１０００％、１７０
０％を超える過電流を検出すると、過電流時限発生回路
７は第５図に示した過電流引外し特性のうちのそれぞれ
長限時領域ＬＴＤ、短限時領域ＳＴＤ、瞬時領域ｌＮ５
Ｔの特性に応じて所定の時間後に対応する引外し出力を
出してトリガ回路８をＯＮさせ、もって引外しコイル９
が励磁されかつ開閉機構部４が開かれることにより主回
路５はしゃ断される。If the overcurrent detection circuit 6 exceeds, for example, 70% of the rated current.
When a current is detected, the overcurrent time limit generating circuit 7 outputs a KG alarm output after a predetermined time according to the overcurrent advance warning characteristics (QC-PAL) shown in FIG.
0 is activated, and the advance warning signal generated by the overcurrent advance warning circuit 10 lights up the overcurrent advance warning display LED II and is supplied to the outside. Furthermore, the overcurrent detection circuit 6 detects, for example, 100%, 1000%, 170% of the rated current.
When an overcurrent exceeding 0% is detected, the overcurrent time limit generating circuit 7 activates the long time limit region LTD, short time limit region STD, and instantaneous region lN5 of the overcurrent tripping characteristics shown in FIG.
After a predetermined period of time according to the characteristics of
is excited and the opening/closing mechanism section 4 is opened, whereby the main circuit 5 is cut off.
第６図は第４図中にブロック図で示した過電流用事前警
報回路１００回路図であり、そして第７図はこの過電ｍ
し用事前警報回路１ｏの動作説明用波形図である。FIG. 6 is a circuit diagram of the overcurrent advance warning circuit 100 shown in the block diagram in FIG. 4, and FIG.
FIG. 2 is a waveform diagram for explaining the operation of the advance warning circuit 1o.
第６図の過電流用事前警報回路１０において、Ｖ＋ 、
５ＧＮＤおよび■−は電源端子、Ｖｒｅｆは後述する
タイマ用比較器の基準電圧供給端子−ＶＲｒｅｆは後述
する事前警報発生用比較器の可変基準電圧供給端子、Ａ
Ｏは第１図に示した過電流時限発生回路７の警報出力が
供給される端子、端子ＶＲｒｅｆと５ＧＮＤの間には抵
抗Ｒ１−ポテンシオメータＶＲおよび抵抗Ｒ２が直列に
接続されている。端子Ｖ＋とＶ−の間に接続さねた第１
の比較手段すなゎち事前警報発生用比較器ｃｏｉは、そ
の非反転入力端子十がポテンシオメータＶＲのアームに
接続されかつ反転入力端子−が端子ＡＯに接続されてい
る 端子Ｖｒｅｆと５ＧＮＤの間には、抵抗Ｒ３とコン
デンサＣが直列に接続され、この直列回路と並列に更に
抵抗Ｒ４とＲ５が直列に接続されている。In the overcurrent advance warning circuit 10 of FIG. 6, V+,
5GND and ■- are power supply terminals, Vref is a reference voltage supply terminal for a timer comparator described later - VRref is a variable reference voltage supply terminal for a comparator for advance warning generation described later, A
O is a terminal to which the alarm output of the overcurrent time limit generation circuit 7 shown in FIG. 1 is supplied, and a resistor R1, a potentiometer VR, and a resistor R2 are connected in series between the terminal VRref and 5GND. The first terminal connected between terminals V+ and V-
The comparison means, that is, the advance warning generation comparator coi, has its non-inverting input terminal 1 connected to the arm of the potentiometer VR, and its inverting input terminal - connected to the terminal AO. A resistor R3 and a capacitor C are connected in series, and resistors R4 and R5 are further connected in series in parallel with this series circuit.
コンデンサＣと並列に常閉スイッチＱ１が接続され、ま
た抵抗Ｒ６も接続されている。端子■＋と■−の間に接
続された第２の比較手段すなわちタイマ用比較器ＣＯ２
は、その非反転入力端子＋が抵抗Ｒ４とＲ５の接続点に
接続されかつ反転入力が抵抗Ｒ３とコンデンサＣの接続
点に接続されている。端子Ｖ＋は出力端子ｏ１に直結さ
れるが、端子Ｖ−は常開スイッチＱ２および抵抗Ｒ７が
ら成る直列回路を介して出力端子ｏ２に接続されている
。A normally closed switch Q1 is connected in parallel with the capacitor C, and a resistor R6 is also connected. A second comparison means, that is, a timer comparator CO2 connected between terminals ■+ and ■-
has its non-inverting input terminal + connected to the connection point between resistors R4 and R5, and its inverting input terminal connected to the connection point between resistor R3 and capacitor C. Terminal V+ is directly connected to output terminal o1, while terminal V- is connected to output terminal o2 via a series circuit consisting of normally open switch Q2 and resistor R7.
次に、このように構成された過電流用事前を報回路１０
の動作を、第７図の波形図を参照しながら説明する。ま
ず事前警報発生用比較器ｃｏｉの可変基準電圧すなわち
事前警報発生レベルを定格電流に応じて所定値に設定し
ておく。例えば定格電流が４０ＯＡの場合にはその７０
％である２８０ＡＫ相当する４■に、また２００Ａの場
合にはその７０％である１４ＯＡに相当する２■に設定
しておく。時点ｔ１において、主回路′！ｆ流に比例す
る、過電流時限発生回路７からの警報出力が小前妙報発
生レベルを超えると、事前警報発生用比較器ＣＯＩは出
力を出して常閉スイッチＱ１をＯＦＦにする。そのため
、抵抗Ｒ３およびコンデンサＣから成るＲＣタイマは動
作を開始し、コンデンサＣが徐々１で充電されてその電
圧が少しずつ上昇する。Next, the overcurrent signal configured in this manner is transmitted to the reporting circuit 10.
The operation will be explained with reference to the waveform diagram in FIG. First, the variable reference voltage of the advance warning generation comparator coi, that is, the advance warning generation level, is set to a predetermined value according to the rated current. For example, if the rated current is 40OA,
%, which corresponds to 280AK, and in the case of 200A, it is set to 2■, which corresponds to 14OA, which is 70% of that. At time t1, the main circuit'! When the alarm output from the overcurrent time limit generating circuit 7, which is proportional to the flow f, exceeds the early alarm generation level, the advance alarm generation comparator COI outputs an output and turns off the normally closed switch Q1. Therefore, the RC timer consisting of resistor R3 and capacitor C starts operating, capacitor C is gradually charged with 1, and its voltage increases little by little.
しかしながら、時点ｔ２で上述の警報出力が事前１１１
報発生レベルよりも小さ（なると、事前警報発生用比較
器ＣＯＩが出力を出さず従って常閉スイッチＱ１がｏＮ
ｖｃ仄ってしまうので、コンデンサＣはとの常閉スイッ
チＱ１を通して瞬時に放電し５従ってその電圧は零にな
る。時点ｔ３で動輪出力が事前警報発生レベルを再び超
えかつこの状態が所定時間例えは４０秒以上連続すると
、コンデンサ電圧かタイマ用比較器ＣＯ２の基準電圧す
なわち管轄出力動作レベルに相当する例えば２．５ｖを
時点ｔ４で超えるので、タイマ用比較器ＣＯ２は出力を
出して常開スイッチＱ２をＯＮにする。そのため、出力
端子０１．０２間に事前警報信号が発生し、この事前警
報は外部に供給されると共に過電流用事前警報表示ＬＥ
ＤＩＩ（第６図には示さない）。点灯させる。However, at time t2, the above alarm output is 111 in advance.
lower than the alarm generation level (when the pre-warning generation comparator COI does not output an output, the normally closed switch Q1 is turned on)
Since vc is crossed, the capacitor C is instantly discharged through the normally closed switch Q1, and its voltage becomes zero. At time t3, when the driving wheel output exceeds the advance warning generation level again and this state continues for a predetermined period of time, for example, 40 seconds or more, the capacitor voltage or the reference voltage of the timer comparator CO2, ie, 2.5V, which corresponds to the jurisdictional output operation level. exceeds at time t4, the timer comparator CO2 outputs an output and turns on the normally open switch Q2. Therefore, an advance warning signal is generated between output terminals 01 and 02, and this advance warning is supplied to the outside and also to the overcurrent advance warning display LE.
DII (not shown in Figure 6). Turn it on.
上述したような従来の回路しゃ断器には、主回路に流れ
る過電流を検出して主回路をしゃ断させるための過電流
列外し特性および過電流に至る前の電流を検出して引外
しの事前に警報を発させるための過電流用事前警報特性
はあるが、漏電警報と地絡保護を行えないという問題点
があった。Conventional circuit breakers as described above have overcurrent line disconnection characteristics to detect overcurrent flowing in the main circuit and cut off the main circuit, and a pre-trip function to detect the current before it reaches an overcurrent. Although it has an advance warning feature for overcurrent to issue a warning, it has the problem that it cannot provide earth leakage warning and ground fault protection.
この発明は、このような問題点を解決するためになされ
たもので、漏電警報と地絡保護も行える回路しゃ断器を
得ることを目的とする。The present invention was made to solve these problems, and an object of the present invention is to provide a circuit breaker that can also perform earth leakage alarm and earth fault protection.
この発明に係る回路しゃ断器は、主回路に流れる地絡電
流およびこの地絡電流に至る前の電流を検出する地絡検
出回路と、この地絡検出回路の検出電流に基づいて前記
主回路をしゃ断させるための地絡例外し特性および引外
しの事前に警報を発させるための地絡用事前警報特性を
有する地絡時限発生回路と、この地絡時限発生回路の警
報出力により作動されて他の警報手段に警報を発させる
他の事前警報信号を発生する地絡用事前警報回路とを設
げたものである。The circuit breaker according to the present invention includes a ground fault detection circuit that detects a ground fault current flowing in a main circuit and a current before reaching this ground fault current, and a ground fault detection circuit that detects a ground fault current flowing in a main circuit and a current that is detected before the ground fault current. An earth fault timer generating circuit having a ground fault exception characteristic for causing a disconnection and a ground fault advance warning characteristic for issuing a warning in advance of tripping; and a ground fault advance warning circuit that generates another advance warning signal that causes the warning means to issue a warning.
この発明では、地絡検出回路がそれぞれ地絡電流、地絡
電流に至る前の電流を検出すると、地絡例外し特性、地
絡用事前警報特性を有する地絡時限発生回路がそれぞれ
引外し出力、警報出力を発生し、上述した引外し出力に
より作動された引外し手段は主回路をしゃ断し、上述し
た警報出力により作動された地絡用事前警報回路は他の
事前警報信号を発生して他の警報手段に警報を発させる
。In this invention, when the ground fault detection circuit detects a ground fault current and a current before reaching a ground fault current, the ground fault time-limit generation circuit having a ground fault exception characteristic and a ground fault advance warning characteristic respectively output a tripping output. , the tripping means that generates an alarm output and is activated by the above-mentioned tripping output cuts off the main circuit, and the ground fault pre-warning circuit that is activated by the above-mentioned alarm output generates another pre-warning signal. Cause other alarm means to issue an alarm.
第１図はこの発明の一実施例を示すブロック図であり、
図において１，２，４，５．７〜１１は第４図に示した
ものと全く同じである。この発明の回路しゃ断器３Ａは
、第４図の過電流検出回路６に代る過電流検出兼地絡検
出回路１２に加えて、この過電流検出兼地絡検出回路１
２のうちの地絡検出回路の出力側圧接続された地絡時限
発生回路１３、この地絡時限発生回路工３の出力側に接
続された地絡用事前警報回路１４、およびこの地絡用事
前警報回路１４の出力側に接続された他の警報手段とし
ての地絡用事前警報表示ＬＥＤ１５を備えている。FIG. 1 is a block diagram showing one embodiment of the present invention,
In the figure, 1, 2, 4, 5.7 to 11 are exactly the same as those shown in FIG. The circuit breaker 3A of the present invention includes an overcurrent detection/ground fault detection circuit 12 in place of the overcurrent detection circuit 6 shown in FIG.
2, a ground fault time limit generation circuit 13 connected to the output side pressure of the ground fault detection circuit 3; a ground fault advance warning circuit 14 connected to the output side of this ground fault time limit generation circuit 3; A ground fault preliminary warning display LED 15 is provided as another warning means connected to the output side of the warning circuit 14.
第２図は、この発明の回路しゃ断器３Ａの過電流列外し
特性および過電流用事前警報特性（ＯＣ−ＰＡＬ’）に
加えて、地絡例外し特性および地絡用事前警報特性（Ｇ
Ｃ−ＰＡＬ）も示す曲線図である。FIG. 2 shows the overcurrent line disconnection characteristic and overcurrent advance warning characteristic (OC-PAL') of the circuit breaker 3A of the present invention, as well as the ground fault exception characteristic and the ground fault advance warning characteristic (G
It is a curve diagram also showing C-PAL).
第１図に示したこの発明の回路しゃ断器３Ａにおいて、
まず漏ｔｆ報について説明する。過電流検出兼地絡検出
回路１２のうちの地絡検出回路が出口路５に流れる小さ
なｋＩ電電流すなわち定格電流の例えば１０％を超える
電流を検出すると、主回路５をしゃ断させるための地絡
例外し特性および引外しの事前に警報を発させるための
地絡用事前Ｉｉ１報特性（ＧＣ−ＰＡＬ）を有する地絡
時限発生回路１３は上述した検出電流に基づいて警報出
力を発生する。この警報出力によって作動された地絡用
事前警報回路１４は事前警報信号を発生し、この油前賢
報信号で地絡用事前警報表示ＬＥＤ１５を点灯させると
共に一ヒ述した事前警報信号を外部へ供給する。In the circuit breaker 3A of the present invention shown in FIG.
First, the leaked TF report will be explained. When the ground fault detection circuit of the overcurrent detection/ground fault detection circuit 12 detects a small kI current flowing in the exit path 5, that is, a current exceeding, for example, 10% of the rated current, a ground fault is detected to cut off the main circuit 5. The ground fault time generating circuit 13, which has an exception characteristic and a ground fault prior Ii1 warning characteristic (GC-PAL) for issuing a warning in advance of tripping, generates an alarm output based on the above-mentioned detected current. The ground fault advance warning circuit 14 activated by this alarm output generates a advance warning signal, and uses this pre-oil warning signal to light up the ground fault advance warning display LED 15 and supplies the above-mentioned advance warning signal to the outside. do.
次に、地絡採機について説明する。上述した地絡検出回
路が主回路５に流れる大きな漏電々流すなわち定格電流
の例えば２０％を超える地絡電流を検出すると、地絡時
限発生回路１３は検出した地絡電流に基づいて引外し出
力を発生してトリガ回路８をＯＮさせ、過電流側外しの
場合と同様にして主回路５をしゃ断させる。Next, the ground fault detection machine will be explained. When the above-mentioned ground fault detection circuit detects a large current leakage current flowing through the main circuit 5, that is, a ground fault current exceeding, for example, 20% of the rated current, the ground fault time generation circuit 13 issues a trip output based on the detected ground fault current. is generated, the trigger circuit 8 is turned on, and the main circuit 5 is cut off in the same manner as in the case of overcurrent side disconnection.
第３図は第６図に示した過電流用事前警報回路１０およ
び第１図中にブロック図で示した地絡用事前警報回路１
４の回路図であり、との地絡用事前−報回路１４におい
て前者の構成要素と同一の構成要素には同一符号に添字
Ａを付けた。地絡用事前警報回路１４は入力感度低下手
段１６を有し、この入力感度低下手段は演算増幅器ＯＰ
および抵抗Ｒ８，Ｒ９から構成されている。もう少し詐
しく云えば、演算増幅器ｏｐは、その非反転入力端子子
が端子ＡＯ＆ｌ”続さ牙１．かつその反転入力端子かそ
の出力端子に接続さノ１ている。この出力端子とアース
の間には抵抗Ｒ８およびＲ９が直列に直列され、これら
抵抗Ｒ８とＲ９の接続点は事前警報発生用比較器ＣＯＩ
の反転入力端子−に接続されている。なお、地絡用事前
警報回路１４中の抵抗Ｒ３ＡおよびコンデンサＣＡから
成るＲＣタイマの時限は、過電流用事前警報回路１０中
の抵抗Ｒ３およびコンデンサＣから成るＲＣタイマの時
限よりも長くされている。また、地絡用事前警報（ロ）
路１４の動作原理は過電流用事前警報回路１０と同じで
あるので、詳しい動作説明１ましない。Figure 3 shows the overcurrent advance warning circuit 10 shown in Figure 6 and the ground fault advance warning circuit 1 shown in the block diagram in Figure 1.
This is a circuit diagram of No. 4, in which the same components as those of the former are given the same reference numerals and a suffix A in the ground fault advance warning circuit 14. The ground fault advance warning circuit 14 has an input sensitivity reduction means 16, and this input sensitivity reduction means is an operational amplifier OP.
and resistors R8 and R9. To put it a bit more falsely, the operational amplifier op has its non-inverting input terminal connected to the terminal AO&l'' and either its inverting input terminal or its output terminal. Resistors R8 and R9 are connected in series, and the connection point between these resistors R8 and R9 is the pre-warning comparator COI.
is connected to the inverting input terminal of -. Note that the time limit of the RC timer made up of resistor R3A and capacitor CA in the ground fault advance warning circuit 14 is set longer than the time limit of the RC timer made up of resistor R3 and capacitor C in the overcurrent advance warning circuit 10. . In addition, advance warning for ground fault (b)
Since the operating principle of the circuit 14 is the same as that of the overcurrent advance warning circuit 10, a detailed explanation of its operation will not be given.
以上、詳述したように、この発明は、主回路に流れる地
絡電流およびこの地絡電流に至る前の電流を検出する地
絡検出回路と、この地絡検出回路の検出電流に基づいて
前記主回路をしゃ断させるための地絡引外し特性および
引外しの事前に警報を発させるための地絡用事前警報特
性を有する地絡時限発生回路と、この地絡時限発生回路
の警報出力により作動されて他の警報手段に警報を発さ
せる他の事前警報信号を発生する地絡用事前警報回路と
を設けたので、小さな漏電では警報を出し、これは回路
しゃ断器を引外したくない時に便利であり、また大きな
漏電すなわち地絡発生時には回路しゃ断器を引外して火
災などの恐れを未然に防止すると云う効果を奏する。As described above in detail, the present invention includes a ground fault detection circuit that detects a ground fault current flowing in a main circuit and a current before reaching this ground fault current, and It is activated by an earth fault time generating circuit that has a ground fault tripping characteristic to cut off the main circuit and a ground fault advance warning characteristic to issue a warning before tripping, and an alarm output of this earth fault time generating circuit. A ground fault advance warning circuit is provided which generates another advance warning signal that causes other alarm means to issue an alarm, so a small earth leakage will issue an alarm, which is useful when you do not want to trip the circuit breaker. In addition, when a large current leakage or ground fault occurs, the circuit breaker is tripped to prevent the risk of fire or the like.
第１図はこの発明の一実施例を示すブロック図、第２図
はこの発明の回路しゃ断器の特性を示す曲線図、第３図
はこの発明に使用される事前警報回路を示す回路図、第
４図は従来の回路しゃ断器を示すブロック図、第５図は
従来の回路しゃ断器の特性を示す曲線図、第６図は従来
の回路しゃ断器に使用される事前警報回路を示す回路図
、第７図は第６図に示した事前警報回路の動作説明用波
形図である。
図において、１は交流側Ｌ２は負荷、３Ａは回路しゃ断
器、４は開閉機構部、５は主回路、７は過電流時限発生
回路、８はトリガ回路、９は弓外しコイル、１０は過電
流用事前警報回路、１１は過電流用事前警報表示ＬＥＤ
、１２は過電流検出兼地絡検出回路、１３は地絡時限発
生回路、１４は地絡用事前警報回路、１５は地絡用事前
警報表示ＬＥＤである。
なお、各図中、同一符号は同−又は相当部分を示す。FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a curve diagram showing the characteristics of the circuit breaker of the present invention, and FIG. 3 is a circuit diagram showing an advance warning circuit used in the present invention. Fig. 4 is a block diagram showing a conventional circuit breaker, Fig. 5 is a curve diagram showing the characteristics of the conventional circuit breaker, and Fig. 6 is a circuit diagram showing an advance warning circuit used in the conventional circuit breaker. , FIG. 7 is a waveform diagram for explaining the operation of the advance warning circuit shown in FIG. 6. In the figure, 1 is the AC side L2 is the load, 3A is the circuit breaker, 4 is the opening/closing mechanism, 5 is the main circuit, 7 is the overcurrent time generation circuit, 8 is the trigger circuit, 9 is the bow removal coil, and 10 is the overcurrent Current advance warning circuit, 11 is overcurrent advance warning display LED
, 12 is an overcurrent detection/earth fault detection circuit, 13 is a ground fault timer generation circuit, 14 is a ground fault advance warning circuit, and 15 is a ground fault advance warning display LED. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (1)
過電流に至る前の電流を検出する過電流検出回路と、こ
の過電流検出回路の検出電流に基づいて前記主回路をし
や断させるための過電流引外し特性および引外しの事前
に警報を発させるための過電流用事前警報特性を有する
過電流時限発生回路と、この過電流時限発生回路の引外
し出力により作動されて前記主回路をしや断する引外し
手段と、前記過電流時限発生回路の警報出力により作動
されて警報手段に警報を発させる事前警報信号を発生す
る過電流用事前警報回路と、前記主回路に流れる地絡電
流およびこの地絡電流に至る前の電流を検出する地絡検
出回路と、この地絡検出回路の検出電流に基づいて前記
主回路をしや断させるための地絡引外し特性および引外
しの事前に警報を発させるための地絡用事前警報特性を
有する地絡時限発生回路と、この地絡時限発生回路の警
報出力により作動されて他の警報手段に警報を発させる
他の事前警報信号を発生する地絡用事前警報回路とを備
え、前記引外し手段は地絡時限発生回路からの引外し出
力でも作動されて前記主回路をしや断することを特徴と
する回路しや断器。An overcurrent detection circuit that detects an overcurrent flowing in a main circuit between an AC power source and a load and a current before reaching this overcurrent, and the main circuit is temporarily disconnected based on the detected current of the overcurrent detection circuit. an overcurrent time limit generation circuit having an overcurrent trip characteristic for the purpose of the trip and an overcurrent advance warning characteristic for issuing a warning in advance of tripping; a tripping means that interrupts the circuit; an overcurrent advance warning circuit that is activated by the alarm output of the overcurrent time limit generation circuit and generates an advance warning signal that causes the alarm means to issue an alarm; and a current flowing through the main circuit. A ground fault detection circuit that detects a ground fault current and a current before reaching the ground fault current, and a ground fault tripping characteristic and tripping function for disconnecting the main circuit based on the detected current of the ground fault detection circuit. A ground fault timed generation circuit having a ground fault advance warning characteristic to issue a warning in advance of disconnection, and other advance warning means activated by the alarm output of this ground fault timed generation circuit to cause other alarm means to issue an alarm. and a ground fault advance warning circuit that generates an alarm signal, wherein the tripping means is also activated by a tripping output from the ground fault timer circuit to interrupt the main circuit. Disconnector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20935488A JPH0260411A (en) | 1988-08-25 | 1988-08-25 | Circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20935488A JPH0260411A (en) | 1988-08-25 | 1988-08-25 | Circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0260411A true JPH0260411A (en) | 1990-02-28 |
Family
ID=16571559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20935488A Pending JPH0260411A (en) | 1988-08-25 | 1988-08-25 | Circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0260411A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006524028A (en) * | 2003-04-17 | 2006-10-19 | エネル ディストリビュズィオーネ ソシエタ ペル アチオニ | Electric circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5192657A (en) * | 1975-02-12 | 1976-08-13 | ||
| JPS5592522A (en) * | 1978-12-28 | 1980-07-14 | Matsushita Electric Works Ltd | Leakage breaker |
| JPS5984167A (en) * | 1982-11-08 | 1984-05-15 | Fujitsu Ltd | Voltage detecting circuit |
| JPS6331418A (en) * | 1986-07-24 | 1988-02-10 | 三菱電機株式会社 | Circuit breaker |
| JPS63144717A (en) * | 1986-12-09 | 1988-06-16 | エナジーサポート株式会社 | Grounding protection relay |
-
1988
- 1988-08-25 JP JP20935488A patent/JPH0260411A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5192657A (en) * | 1975-02-12 | 1976-08-13 | ||
| JPS5592522A (en) * | 1978-12-28 | 1980-07-14 | Matsushita Electric Works Ltd | Leakage breaker |
| JPS5984167A (en) * | 1982-11-08 | 1984-05-15 | Fujitsu Ltd | Voltage detecting circuit |
| JPS6331418A (en) * | 1986-07-24 | 1988-02-10 | 三菱電機株式会社 | Circuit breaker |
| JPS63144717A (en) * | 1986-12-09 | 1988-06-16 | エナジーサポート株式会社 | Grounding protection relay |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006524028A (en) * | 2003-04-17 | 2006-10-19 | エネル ディストリビュズィオーネ ソシエタ ペル アチオニ | Electric circuit breaker |
| JP4920890B2 (en) * | 2003-04-17 | 2012-04-18 | エネル ディストリビュズィオーネ ソシエタ ペル アチオニ | Electric circuit breaker |
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