JPS6122720A - Overcurrent tripping device of circuit breaker - Google Patents
Overcurrent tripping device of circuit breakerInfo
- Publication number
- JPS6122720A JPS6122720A JP14158984A JP14158984A JPS6122720A JP S6122720 A JPS6122720 A JP S6122720A JP 14158984 A JP14158984 A JP 14158984A JP 14158984 A JP14158984 A JP 14158984A JP S6122720 A JPS6122720 A JP S6122720A
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- current
- circuit
- ptc element
- circuit breaker
- resistance value
- 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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Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、例えば低圧回路保護用の回路しゃ断器の過電
流引はずし装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in an overcurrent trip device for a circuit breaker for protecting a low voltage circuit, for example.
従来、回路しゃ断器の過電流引はずし装置として、バイ
メタルや、オイルダッシュポットの時延機構を有する電
磁石などを使用した機械式のものと、変流器の二次回路
に抵抗ＲとコンデンサＣなどによるタイマー回路を有す
る電子式のものがある。−後者の電子式のものは前者の
機械式のものに比べて精度が高く、調整が容易であり、
保護機能を容易に付加できるなどの特徴があり、次第に
広く普及しつつあるが、前記タイマー回路の他にスイッ
チング回路が必要で回路構成が複雑になり高価になると
いう欠点がある。Conventionally, as overcurrent tripping devices for circuit breakers, there have been mechanical ones using bimetals and electromagnets with a time delay mechanism for oil dashpots, and resistors R and capacitors C in the secondary circuit of current transformers. There is an electronic type with a timer circuit. -The latter electronic type is more accurate and easier to adjust than the former mechanical type,
It has the advantage of being able to easily add a protection function, and is becoming increasingly popular, but it has the disadvantage that it requires a switching circuit in addition to the timer circuit, making the circuit configuration complex and expensive.
そこで出願人は以上のような欠点を除去するため、第３
図のように構成した回路しゃ断器の過電流引はずし装置
を発明した。三相回路しゃ断器の主回路の接点部１に変
流器２の一次側が接続され、この変流器２の二次側に、
整流器３を介して、特定の温度範囲をこえたとき固有抵
抗が急激に増大する組成物からなるＰＴＣ素子４と引は
ずしコイル５をそれぞれ並列に接続し、前記主回路に過
電流が流れた場合に変流器２の二次電流によって前２９
丁Ｃ素子４をスイッチングさせ、この２丁Ｃ素子４に流
れていた電流を引はずしコイル５に転流させるようにし
たものである。 ゛前記ＰＴＣ素子４として例
えばチタン酸バリウム系のセラミックスあるいはポリエ
チレンにカーボンの微細分子を混入したポリマーを用い
る。このＰＴＣ素子４はいずれもＰＴＣ特性（抵抗変化
倍数が１０４ｇ、上のもの）が優れているが、使用電圧
が２００Ｖ以下で、通電電流は数Ａ以下の小容量のもの
である。前記ポリマーの温度−抵抗特性は第４図のよう
になっており、またスイッチングするまでの時間と通電
電流の関係は第５図のようになっている。第４図に示す
ように、常温近傍では、温度変化に対する固有抵抗値（
以下抵抗値と称す）が数オームとほとんど変化はないが
、温度が１００〜１４０°の範囲で抵抗値はメグオーム
オーダーになるので、温度が１００〜１４ｏ°のときは
電流は２丁Ｃ素子４にほとんど流れなくなりスイッチン
グ作用が行われる。このようなＰＴＣ素子４にあるＩａ
以下の電流が流れた場合、ジュール熱（１２Ｒ）は小さ
く、抵抗値が急増する温度（スイッチング湿度）に至ら
ない。この範囲の電流を連続通電可能電流という。この
連続通電可能電流を越えたときの電流の大きさが、大き
いほど、ジュール熱が大きくこれによりスイッチング温
度に達するまでの時間は短くなるので、第５図に示すよ
うな逆限時特性となる。なお、前記用はずしコイル５の
抵抗値に対して前記ＰＴＣ素子４の抵抗値が１〜２桁以
上小さく選定しである。Therefore, in order to eliminate the above-mentioned drawbacks, the applicant
We have invented an overcurrent trip device for a circuit breaker configured as shown in the figure. The primary side of a current transformer 2 is connected to the contact part 1 of the main circuit of the three-phase circuit breaker, and the secondary side of this current transformer 2 is
When a PTC element 4 made of a composition whose specific resistance rapidly increases when a specific temperature range is exceeded and a trip coil 5 are connected in parallel via a rectifier 3, and an overcurrent flows in the main circuit. 29 before by the secondary current of current transformer 2
The two C elements 4 are switched, and the current flowing through the two C elements 4 is commutated to the trip coil 5. As the PTC element 4, for example, barium titanate ceramics or a polymer made of polyethylene mixed with fine carbon molecules is used. All of these PTC elements 4 have excellent PTC characteristics (resistance change multiple of 104 g, above), but the operating voltage is 200 V or less, and the current flow is of a small capacity of several A or less. The temperature-resistance characteristics of the polymer are as shown in FIG. 4, and the relationship between the time until switching and the applied current is as shown in FIG. As shown in Figure 4, near room temperature, the specific resistance value (
The resistance value (hereinafter referred to as resistance value) is a few ohms and hardly changes, but when the temperature ranges from 100 to 140 degrees, the resistance value becomes on the order of megohms, so when the temperature is from 100 to 14 degrees, the current flows through two C elements Almost no current flows and a switching action takes place. Ia in such a PTC element 4
When the following current flows, the Joule heat (12R) is small and does not reach the temperature (switching humidity) at which the resistance value rapidly increases. The current in this range is called the continuous current. The larger the magnitude of the current when it exceeds the continuous current, the greater the Joule heat, which shortens the time it takes to reach the switching temperature, resulting in a reverse time characteristic as shown in FIG. The resistance value of the PTC element 4 is selected to be one to two orders of magnitude smaller than the resistance value of the switching coil 5.
つぎに以上のように構成された回路しゃ断器の過電流引
はずし装置ｄ動作について説明する。しゃ断器に過電流
が流れると、この過電流に対応した電流が変流器２の二
次側に流れる。ところが、引はずしコイル５の抵抗値に
対してＰＴＣ素子４の抵抗値を、１〜２桁以上小さく選
定しであるので、変流器２の二次電流は、はとんどＰＴ
Ｃ素子に流入し、引はずしコイル５には、微少電流しが
流れていない。過電流がある時間継続するとジュール熱
によりＰＴＣ素子４の温度がスイッチング温度に達し、
ＰＴＣ素子４の抵抗値が＠増する。Next, the operation of the overcurrent tripping device d for the circuit breaker configured as described above will be explained. When an overcurrent flows through the breaker, a current corresponding to this overcurrent flows to the secondary side of the current transformer 2. However, since the resistance value of the PTC element 4 is selected to be one or two orders of magnitude smaller than the resistance value of the tripping coil 5, the secondary current of the current transformer 2 is mostly PT
No minute current flows into the C element and into the trip coil 5. When the overcurrent continues for a certain period of time, the temperature of the PTC element 4 reaches the switching temperature due to Joule heat.
The resistance value of the PTC element 4 increases.
ＰＴＣ素子４の抵抗値が急増すると、ＰＴＣ素子４と並
列に接続された引はずしコイル５にＮ流が転流し、アク
チュエータを付勢し、回路しゃ断器の接点部１が開路し
主回路電流がしゃ断される。When the resistance value of the PTC element 4 increases rapidly, N current is commutated to the tripping coil 5 connected in parallel with the PTC element 4, energizing the actuator, opening the contact part 1 of the circuit breaker, and reducing the main circuit current. It will be cut off.
主回路電流がしゃ断されると変流器２の二次電流は消滅
するので、ＰＴＣ素子４は冷却され再使用できる状態と
なる。変流器２の二次電流の大きさに応じて、ＰＴＣ素
子４のスイッチングするまでの時間は変化し、はぼ第５
図に示したような引はずし特性をうろことができる。When the main circuit current is cut off, the secondary current of the current transformer 2 disappears, so the PTC element 4 is cooled and ready for reuse. The time it takes for the PTC element 4 to switch changes depending on the magnitude of the secondary current of the current transformer 2.
It is possible to explore the trip characteristics as shown in the figure.
ところが、第３図のような引はずし装置を具体的に開発
するには、過電流引はずし山盛設定値の調整を何らかの
手段で行う必要がある。一般にこの種、峙延特性を有す
る引はずし特性の目盛設定値は、連続通電可能電流最大
ｊ直で表現されている。However, in order to specifically develop a trip device as shown in FIG. 3, it is necessary to adjust the overcurrent trip peak setting value by some means. Generally, the scale setting value of this type of trip characteristic having a linear extension characteristic is expressed by the maximum continuous current that can be applied.
例えば、第６図に示すような引はずし特性（１−を特性
）においては、電流ｊの目盛設定値はＡとなる。この電
流目盛設定値△を越える電流が流れると、その電流に対
応した時間でしゃ断器が引はずされることになる。For example, in the trip characteristic (characteristic 1-) as shown in FIG. 6, the scale setting value of the current j is A. If a current exceeding this current scale setting value △ flows, the circuit breaker will be tripped at a time corresponding to the current.
そこで、この引はずし電流目盛を調整するためには、Ｐ
ＴＣ素子４に流れる電流を、変流器２の一次電流、すな
わち、接点部１に流れる電流が変化しても、一定になる
ようにすればよい。この手段として、容易に考えられる
のは、第７図または第８図のように構成することである
。まず第７図は、ＰＴＣ素子４に直列に可変抵抗器６を
接続し、ＰＴＣ素子４に流れる電流を調整するものであ
る。Therefore, in order to adjust this trip current scale, P
The current flowing through the TC element 4 may be made constant even if the primary current of the current transformer 2, that is, the current flowing through the contact portion 1 changes. An easily conceivable means for this is to configure as shown in FIG. 7 or 8. First, in FIG. 7, a variable resistor 6 is connected in series with the PTC element 4, and the current flowing through the PTC element 4 is adjusted.
しかし、引はずしコイル５には、常時（すなわち、ＰＴ
Ｃ素子４がスイッチングしないとき〉、はとんど電流が
流れないように引はずしコイル５の抵抗値に比べて、Ｐ
ＴＣ素子４の抵抗値が充分小さくなっていること、さら
に回路しゃ断器の引はずし機構は、比較的微小電流で動
作するよう高感度に設計する必要があるため、引はずし
コイル５自身の抵抗値は非常に大きいことから、ＰＴＣ
素子４側と引はずしコイル５側に流れる電流の分流比を
変えて、ＰＴＣ素子４に流れる電流を変化させるために
は、可変抵抗器６の抵抗値は、引はずしコイル５の抵抗
値に近づける要がある。したがつて、常時用はずしコイ
ル５に大きな電流が流れることになり、誤動作し易くな
ること、誤動作しないようにしようとすると、微小電流
で動作させる小勢力アクチュエーターの代りに、感度の
悪い大形のアクチュエーターが必要となり、変流器２も
大形になってしなうという欠点がある。However, the trip coil 5 always (i.e., PT
When the C element 4 does not switch, the P
Since the resistance value of the TC element 4 must be sufficiently small and the tripping mechanism of the circuit breaker must be designed with high sensitivity so that it operates with a relatively small current, the resistance value of the tripping coil 5 itself must be is very large, so PTC
In order to change the current flowing through the PTC element 4 by changing the division ratio of the current flowing through the element 4 side and the tripping coil 5 side, the resistance value of the variable resistor 6 should be made close to the resistance value of the tripping coil 5. There is a point. Therefore, a large current flows through the always-on disconnection coil 5, making it more likely to malfunction.In order to prevent malfunction, a large-sized actuator with poor sensitivity is used instead of a small-force actuator that operates with a minute current. This has the disadvantage that an actuator is required and the current transformer 2 is also large in size.
つぎに第８図は、ＰＴＣ素子４に並列に可変抵抗器７を
設け、この可変抵抗器７の抵抗値を調整し、ＰＴＣ素子
４に分流する電流を調整しようとするものである。この
回路は、可変抵抗器７の抵抗値をＰ、ＴＣ素子４の抵抗
値に近い値のものにする必要がある。このことは、引は
ずしコイル５の抵抗値より、かなり小さな値にしなけれ
ばならないということである。したがって、ＰＴＣ素子
４がスイッチングしたとき、変流器２の二次電流が全て
引きはずしコイル５に流れ得ず、大部分の電流が可変抵
抗器６に分流してしまうことになる。Next, in FIG. 8, a variable resistor 7 is provided in parallel with the PTC element 4, and the resistance value of the variable resistor 7 is adjusted to adjust the current shunted to the PTC element 4. In this circuit, the resistance value of the variable resistor 7 needs to be close to the resistance value of the P, TC element 4. This means that the resistance value must be much smaller than the resistance value of the trip coil 5. Therefore, when the PTC element 4 switches, all of the secondary current of the current transformer 2 cannot flow to the trip coil 5, and most of the current ends up being shunted to the variable resistor 6.
このことは、引はずしコイル５に流れる電流が減少する
のを補うため変流器２を大形にするか、引はずしコイル
５で付勢されるアクチュエーターをさらに高感度にしな
ければならないという欠点かある。Is this a disadvantage that either the current transformer 2 must be made larger to compensate for the decrease in the current flowing through the tripping coil 5, or the actuator energized by the tripping coil 5 must be made more sensitive? be.
本発明は以上のような事情にもとづいてなされたもので
、従来装置のようにタイマー回路やスイッチング回路が
不要で、回路構成が簡単で、大容量の電力用としても使
用でき、過電流引はずし電流目盛設定値を自由に調整で
きる回路しゃ断器の過電流引はずし装置を提供すること
を目的どする。The present invention was made based on the above circumstances, and unlike conventional devices, it does not require a timer circuit or switching circuit, has a simple circuit configuration, can be used for large-capacity power, and has an overcurrent trip resistance. It is an object of the present invention to provide an overcurrent trip device for a circuit breaker in which the current scale setting value can be freely adjusted.
本発明は前記目的を達成するために、回路しゃ断器の主
回路に流れる電流を検出する変流器の二次側に、特定の
温度範囲をこえたとき固有抵抗値が急激に増大する組成
物からなるＰＴＣ素子と抵抗器の直列回路を少なくとも
２個並列に接続し、前記直列回路に前記接点部を引はず
す引はずしコイルを並列に接続したものである。In order to achieve the above object, the present invention provides a composition whose specific resistance value rapidly increases when a specific temperature range is exceeded, on the secondary side of a current transformer that detects the current flowing in the main circuit of a circuit breaker. At least two series circuits consisting of a PTC element and a resistor are connected in parallel, and a tripping coil for tripping the contact portion is connected in parallel to the series circuit.
以下、本発明について図面を参照して説明する。 Hereinafter, the present invention will be explained with reference to the drawings.
第１図は本発明による回路しｆＩ断器の過電流引はずし
装置の一実施例を示す回路図である。三相回路しゃ断器
の接点部１にそれぞれ直列に変流器２の一次側が接続さ
れ、この変流器２の二次側に整流器３が接続され、これ
により接点部１に流れる交流電流が整流されるようにな
っている。そして、この整流器３の出力側にＰＴＣ素子
８と可変抵抗器１０の直列回路、ＰＴＣ素子９ど可変抵
抗器１１の直列回路がそれぞれ並列に接続され、ＰＴＣ
９と可変抵抗器１１の直列回路に、並列に引はずしコイ
ル５が接続されている。この引はずしコイル５は、小勢
力アクチュエーターのコイルであり、これに流れる電流
で小勢力アクチュエーターの永久磁石による磁束を打消
し、小勢力アクチュエーターを動作させるものであり、
この種アクチュエーターについては漏電しゃ断器や、低
圧しゃ断器の電子式引はずし装置に広く採用されている
ので、ここではその詳細な説明は省略する。前記ＰＴＣ
素子８．９としては、例えば第３図で使用したものと同
一のものを使用する。FIG. 1 is a circuit diagram showing an embodiment of an overcurrent tripping device for an fI circuit breaker according to the present invention. The primary side of a current transformer 2 is connected in series to the contact section 1 of the three-phase circuit breaker, and the rectifier 3 is connected to the secondary side of the current transformer 2, thereby rectifying the alternating current flowing through the contact section 1. It is now possible to do so. A series circuit of a PTC element 8 and a variable resistor 10 and a series circuit of a PTC element 9 and a variable resistor 11 are connected in parallel to the output side of the rectifier 3.
A trip coil 5 is connected in parallel to the series circuit of the variable resistor 9 and the variable resistor 11. This tripping coil 5 is a coil of a small force actuator, and the current flowing through it cancels the magnetic flux caused by the permanent magnet of the small force actuator to operate the small force actuator.
Since this type of actuator is widely used in electric leakage circuit breakers and electronic trip devices for low voltage circuit breakers, a detailed explanation thereof will be omitted here. Said PTC
As the element 8.9, for example, the same element as that used in FIG. 3 is used.
つぎに、このように構成された回路しゃ断器の過電流引
はずし装置の動作について説明する。ＰＴＣ素子８．９
の抵抗を第２図の等価回路に示すようにＲｅ 、Ｒ１１
，可変抵抗器１０．’１１ｆ７）抵抗をＲＩ ＋ Ｒ１
１、引はずしコイル５の抵抗をＲ５とし、しゃ断器に流
れる電流をｉとし、そのときの変流器２の二次電流をｌ
／ｎとすると、それぞれ、ＰＴＣ素子８．ＰＴＣ素子９
．引はずしコイル５に流れる電流１１．ｉ２．ｉ３はつ
ぎのようになる。Next, the operation of the circuit breaker overcurrent tripping device configured as described above will be explained. PTC element 8.9
As shown in the equivalent circuit of Fig. 2, the resistance of Re, R11
, variable resistor 10. '11f7) resistor RI + R1
1. The resistance of the tripping coil 5 is R5, the current flowing through the breaker is i, and the secondary current of the current transformer 2 at that time is l.
/n, respectively, the PTC elements 8. PTC element 9
．． Current flowing through tripping coil 5 11. i2. i3 is as follows.
ここで、しゃ断器に４０ＯＡの電流が流れ、しゃ断器に
流れる電流（変流器２の一次電流）と変流器２の二次電
流の比ｎ ＝ ４０００． Ｐ Ｔ Ｃ素子８，９の常
温での抵抗Ｒ８＝１Ω、Ｒ９＝１Ω、可変抵抗器１０．
１１の抵抗設定値ＲＩ＝３０Ω、Ｒ，，＝３００．引は
ずしコイル５の抵抗値を５０００とすると、
ｉｔ ＝ ｉ ２ ＃ ４８ｍＡ 、
ｉ ３ ”＝３ｍＡとなる。なすわち、４８ｍＡを
越えるとスイッチング作用を行うようにＰＴＣ素子８，
９を設泪すれば、過電流引はずし電流目盛は４００Ａと
なる。Here, a current of 40OA flows through the breaker, and the ratio of the current flowing through the breaker (primary current of current transformer 2) to the secondary current of current transformer 2 is n = 4000. Resistance of PTC elements 8 and 9 at room temperature R8=1Ω, R9=1Ω, variable resistor 10.
11 resistance setting value RI=30Ω, R,,=300. If the resistance value of the trip coil 5 is 5000, it = i 2 # 48mA,
i 3 "=3 mA. That is, the PTC element 8,
If 9 is set, the overcurrent trip current scale will be 400A.
次に、この場合の作用を説明すると、しゃ断器に４００
△を越える電流が流れると、変流器２の二次回路には１
００ ｍＡ （４００Ａ／４０００）を越える電流が流
れ、ＰＴＣ素子８．９には同じように４８ｍＡを越える
電流が流れる。したがって、ＰＴＣ素子８，９がスイッ
チング作用を行い抵抗値が急増し、全ての電流が引はず
しコイル５に転流し、しゃ断器の引けずしが行われる。Next, to explain the effect in this case, the breaker
When a current exceeding △ flows, 1 is applied to the secondary circuit of current transformer 2.
A current exceeding 00 mA (400 A/4000) flows through the PTC element 8.9, and a current exceeding 48 mA similarly flows through the PTC element 8.9. Therefore, the PTC elements 8 and 9 perform a switching action, the resistance value increases rapidly, and all the current is commutated to the tripping coil 5, thereby tripping the breaker.
つぎに、たとえば、可変抵抗器１０の抵抗設定値をＲ幻
−１００，Ｒ，、＝１００Ωに変更すると、し―断器に
２２８Ａの電流が流れたときｉ ｓ ”ｒ４８ｍＡ、
ｉ ２４７．５ 、 ｉ ３ ＃１．１となるため
、しゃ断器に流れる電流が２２８Ａを越えると、ＰＴＣ
素子８に流れる電流が４．８ ｍ Ａを越えるので、（
４８ＡｍΔを越えるとスイッチングするように設計され
ているので）ＰＴＣ素子８の抵抗が急増し変流器の二次
電流は、それぞれの抵抗値に反比例するように、ＰＴＣ
素子つと、引はずしコイル５に転流する。すなわち、す
るのでスイッチング作用により抵抗値が急増し、全ての
変流器二次電流が引はずしコイル５に転流し、しゃ断器
の引はずしが行われる。Next, for example, if the resistance setting value of the variable resistor 10 is changed to R-100, R,, = 100Ω, when a current of 228A flows through the disconnector, i s ”r48mA,
i 247.5, i 3 #1.1, so if the current flowing through the breaker exceeds 228A, the PTC
Since the current flowing through element 8 exceeds 4.8 mA, (
The resistance of the PTC element 8 increases rapidly, and the secondary current of the current transformer is inversely proportional to the respective resistance value.
When the element is turned on, current is commutated to the tripping coil 5. That is, the resistance value increases rapidly due to the switching action, and all the current transformer secondary current is commutated to the tripping coil 5, causing the breaker to trip.
以上のように、可変抵抗器１０．１１の抵抗値を変える
ことによって、しゃ断器を引はずす電流を変えることが
でき、これにより過電流引はずし電流目盛を変えること
ができる。As described above, by changing the resistance value of the variable resistor 10.11, the current that trips the circuit breaker can be changed, and thereby the overcurrent tripping current scale can be changed.
このように、引はずしコイル５に対して、可変抵抗器１
０とＰＴＣ素子８の直列回路と、可変抵抗器１１とＰＴ
Ｃ素子９の直列回路を２ヶ並列に設（ブるという簡単な
構成で、自由に引はずし電流目盛を変更づ−ることが可
能となる。In this way, the variable resistor 1 is connected to the trip coil 5.
0 and a series circuit of PTC element 8, variable resistor 11, and PT
With a simple configuration of arranging two series circuits of C elements 9 in parallel, it is possible to freely change the trip current scale.
従って、前記ＰＴＣ素子８．９は通電電流が小さくても
、大容量の電力用の回路しゃ断器の過電流引はずし装置
が得られる。Therefore, even if the PTC element 8.9 carries a small current, an overcurrent tripping device for a large capacity power circuit breaker can be obtained.
以上述べた実施例では、ＰＴＣ素子８と可変抵抗器１０
．ＰＴＣ素子９と可変抵抗器１１の直列回路が２個の場
合について説明したが、前記直列回路が３個以上であっ
ても可能である。また、ＰＴＣ素子として、ポリマー系
のもの、セラミック系のもの、あるいは優れたＰＴＣ特
性を有するものであれば、他の材料でもよい。また第１
図では引はずしコイルで永久磁石を使用した小勢力アク
チュエーターの逆励磁する方式について示したものであ
るが、普通の引はずしコイルを採用する場合（この場合
は変流器の二次側を大きくする必要があるが）には、第
１図の整流器３は不要となる。In the embodiment described above, the PTC element 8 and the variable resistor 10
．． Although the case where there are two series circuits of the PTC element 9 and the variable resistor 11 has been described, it is also possible to have three or more series circuits. Furthermore, the PTC element may be made of polymers, ceramics, or other materials as long as they have excellent PTC characteristics. Also the first
The figure shows a method for reverse excitation of a small-force actuator using a permanent magnet with a trip coil, but if a normal trip coil is used (in this case, the secondary side of the current transformer should be made larger). ), the rectifier 3 of FIG. 1 becomes unnecessary.
以上述べた本発明によれば、回路し１５断器の主回路に
流れる電流を検出する変流器の二次側に、特定の温度範
囲をこえたとき固有抵抗値が急激に増′大する組成物か
らなるＰＴＣ素子と抵抗器の直列回路を少なくとも２個
並列に接続し、前記直列回路に引はずしコイルを並列に
接続したので、従来装置のようにタイマー回路やスイッ
チング回路が不要で、回路構成が簡単で、大容量の電力
用としても使用でき、過電流引はずし電流目盛設定値を
自由に調整できる回路しゃ断器の過電流引はずし装置を
提供できる。According to the present invention described above, the secondary side of the current transformer that detects the current flowing in the main circuit of the circuit breaker has a characteristic resistance value that rapidly increases when the temperature exceeds a specific temperature range. At least two series circuits of a PTC element and a resistor made of a composition are connected in parallel, and a trip coil is connected in parallel to the series circuit, so there is no need for a timer circuit or switching circuit as in conventional devices, and the circuit It is possible to provide an overcurrent trip device for a circuit breaker that has a simple configuration, can be used for large-capacity power, and can freely adjust the overcurrent trip current scale set value.
第１図は、本発明による回路しゃ断器の過電流引はずし
装置の一実施例を示す回路図、第２図は第１図の等価回
路図、第３図は出願人が発明した回路しゃ断器の過電流
引はずし装置の回路図、第４図および第５図は第１図、
第３図のＰＴＣ素子のＰＴＣ特性およびスイッチングす
るまでの時間と通電電流の関係の一例を示す図、第６図
は第３図の引はずし電流目盛を説明するためのＩ−を特
性図、第７図および第８図は第３図のＰＴＣ素子に流れ
る電流を調整する回路の異る例を示す図である。
１・・・接点部、２・・・変流器、３・・・整流器、５
・・・引はずしコイル、８，９・・・ＰＴＣ素子、１０
．１１・・可変抵抗器。
出願人代理人 弁理士 鈴江武彦
第１図
第３図
第４図
第５図
第６図
第７図 第８図FIG. 1 is a circuit diagram showing an embodiment of an overcurrent tripping device for a circuit breaker according to the present invention, FIG. 2 is an equivalent circuit diagram of FIG. 1, and FIG. 3 is a circuit breaker invented by the applicant. The circuit diagrams of the overcurrent trip device, Figures 4 and 5 are as shown in Figure 1,
Fig. 3 is a diagram showing an example of the relationship between the PTC characteristics of the PTC element and the time until switching and the conduction current; Fig. 6 is a characteristic diagram of I- for explaining the trip current scale in Fig. 3; 7 and 8 are diagrams showing different examples of circuits for adjusting the current flowing through the PTC element of FIG. 3. 1... Contact portion, 2... Current transformer, 3... Rectifier, 5
...Trip coil, 8,9...PTC element, 10
．． 11... Variable resistor. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8
Claims (1)
二次側に、特定の温度範囲をこえたとき固有抵抗値が急
激に増大する組成物からなるＰＴＣ素子と抵抗器の直列
回路を、少なくとも２個並列に接続し、前記直列回路に
引はずしコイルを並列に接続し、前記ＰＴＣ素子に直列
に接続された抵抗器の抵抗値を調整することによって複
数個の前記ＰＴＣ素子に流れる分流比を変化させ、過電
流引はずし目盛り設定値を調整できるようにしたことを
特徴とする回路しゃ断器の過電流引はずし装置。On the secondary side of the current transformer that detects the current flowing in the main circuit of the circuit breaker, a series circuit of a resistor and a PTC element made of a composition whose specific resistance increases rapidly when a specific temperature range is exceeded is installed. , at least two are connected in parallel, a tripping coil is connected in parallel to the series circuit, and a shunt current flows to the plurality of PTC elements by adjusting the resistance value of a resistor connected in series with the PTC element. An overcurrent trip device for a circuit breaker, characterized in that the overcurrent trip scale setting value can be adjusted by changing the ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14158984A JPS6122720A (en) | 1984-07-09 | 1984-07-09 | Overcurrent tripping device of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14158984A JPS6122720A (en) | 1984-07-09 | 1984-07-09 | Overcurrent tripping device of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6122720A true JPS6122720A (en) | 1986-01-31 |
Family
ID=15295521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14158984A Pending JPS6122720A (en) | 1984-07-09 | 1984-07-09 | Overcurrent tripping device of circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6122720A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05221510A (en) * | 1992-02-13 | 1993-08-31 | Kao Corp | Article handling device |
| JPH06239407A (en) * | 1993-02-18 | 1994-08-30 | Kao Corp | Method and apparatus for receiving article |
| JPH06239406A (en) * | 1993-02-18 | 1994-08-30 | Kao Corp | Method and apparatus for collecting article |
| JPH06316334A (en) * | 1993-03-11 | 1994-11-15 | Kao Corp | Article receiving device |
| US5666254A (en) * | 1995-09-14 | 1997-09-09 | Raychem Corporation | Voltage sensing overcurrent protection circuit |
| US5689395A (en) * | 1995-09-14 | 1997-11-18 | Raychem Corporation | Overcurrent protection circuit |
| US5737160A (en) * | 1995-09-14 | 1998-04-07 | Raychem Corporation | Electrical switches comprising arrangement of mechanical switches and PCT device |
| US5864458A (en) * | 1995-09-14 | 1999-01-26 | Raychem Corporation | Overcurrent protection circuits comprising combinations of PTC devices and switches |
-
1984
- 1984-07-09 JP JP14158984A patent/JPS6122720A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05221510A (en) * | 1992-02-13 | 1993-08-31 | Kao Corp | Article handling device |
| JPH06239407A (en) * | 1993-02-18 | 1994-08-30 | Kao Corp | Method and apparatus for receiving article |
| JPH06239406A (en) * | 1993-02-18 | 1994-08-30 | Kao Corp | Method and apparatus for collecting article |
| JPH06316334A (en) * | 1993-03-11 | 1994-11-15 | Kao Corp | Article receiving device |
| US5666254A (en) * | 1995-09-14 | 1997-09-09 | Raychem Corporation | Voltage sensing overcurrent protection circuit |
| US5689395A (en) * | 1995-09-14 | 1997-11-18 | Raychem Corporation | Overcurrent protection circuit |
| US5737160A (en) * | 1995-09-14 | 1998-04-07 | Raychem Corporation | Electrical switches comprising arrangement of mechanical switches and PCT device |
| US5864458A (en) * | 1995-09-14 | 1999-01-26 | Raychem Corporation | Overcurrent protection circuits comprising combinations of PTC devices and switches |
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