JP7095758B2 - Electronic circuit breaker and circuit breaker system using it - Google Patents

Electronic circuit breaker and circuit breaker system using it Download PDF

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JP7095758B2
JP7095758B2 JP2020570315A JP2020570315A JP7095758B2 JP 7095758 B2 JP7095758 B2 JP 7095758B2 JP 2020570315 A JP2020570315 A JP 2020570315A JP 2020570315 A JP2020570315 A JP 2020570315A JP 7095758 B2 JP7095758 B2 JP 7095758B2
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remaining time
circuit breaker
current
value
electronic circuit
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JPWO2020161890A1 (en
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敏光 野村
晴彦 山崎
雄介 瀧川
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/093—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current with timing means

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Description

この発明は、マイクロコンピュータにより電路に流れる電流レベルに応じた引外し動作時間を演算し引外し動作を行う電子式回路遮断器およびその電子式回路遮断器を用いた回路遮断器システムに関するものである。 The present invention relates to an electronic circuit breaker that calculates the tripping operation time according to the current level flowing in the electric circuit by a microcomputer and performs the tripping operation, and a circuit breaker system using the electronic circuit breaker. ..

従来の電子式回路遮断器は、配電線路の電源側に設置された上位の電子式回路遮断器の引外し特性データを受信して、自身の引外し特性データと比較し、その比較結果に応じて、上位の電子式回路遮断器の引外し特性データの良否を判定し、否の場合は正しい引外し特性データを上位の電子式回路遮断器へ送信し、上位の電子式回路遮断器の引外し特性データを変更させるものが知られている（例えば、特許文献１参照）。 The conventional electronic circuit breaker receives the trip characteristic data of the upper electronic circuit breaker installed on the power supply side of the distribution line, compares it with its own trip characteristic data, and responds to the comparison result. Then, the quality of the trip characteristic data of the upper electronic circuit breaker is judged, and if not, the correct trip characteristic data is transmitted to the upper electronic circuit breaker, and the pull of the upper electronic circuit breaker is performed. It is known that the removal characteristic data is changed (see, for example, Patent Document 1).

特開２００２－２９１１４７JP-A-2002-291147

図１２は、従来の回路遮断器の課題を説明するための図で一般的な上位の回路遮断器と下位の回路遮断器の接続例を示す図、図１３は従来の上位および下位の回路遮断器におけるそれぞれの動作特性曲線が示された保護協調特性を示す図で、横軸に負荷電流、縦軸に遮断までの動作時間をとったものである。
通常、上位の回路遮断器Ａの定格電流値は、下位の回路遮断器Ｂ１とＢ２、およびＢ３に定常状態で流れる各電流値ＩＢ１、ＩＢ２、およびＩＢ３の合算値より大きい定格電流値のものが選定される。図１２に示すように、下位の回路遮断器Ｂ１、Ｂ２、Ｂ３の定常状態の電流値ＩＢ１、ＩＢ２、ＩＢ３が、それぞれ、ＩＢ１＝６０Ａ、ＩＢ２＝１５Ａ、ＩＢ３＝１５Ａである場合、上位の回路遮断器Ａの定常状態の電流値ＩＡは、ＩＡ＝９０Ａとなるので、上位の回路遮断器Ａの定格電流値として、例えば、１００Ａが選定される。また、図１３に示すように、上位の回路遮断器Ａの動作特性曲線も、下位の回路遮断器Ｂ１、Ｂ２、Ｂ３の動作特性曲線より上側、すなわち、遮断までの動作時間が、上位の回路遮断器Ａの方が長くなるように設定されている。
このような定格電流の選定と動作特性曲線の設定により、１つの下位の回路遮断器に流れる電流が過負荷状態になったとしても、過負荷状態になっている回路の直近の上位側に設置されている回路遮断器が、その動作特性曲線に応じ遮断動作を行い電路の電線を過負荷電流から保護するので、定常状態の電流が流れている健全な回路は遮断されることなく電気が供給され続ける。FIG. 12 is a diagram for explaining the problems of the conventional circuit breaker, and is a diagram showing a connection example of a general upper circuit breaker and a lower circuit breaker. FIG. 13 is a diagram showing a connection example of a conventional upper circuit breaker and a lower circuit breaker. It is a figure which shows the protection cooperation characteristic which showed each operation characteristic curve in a device, and the horizontal axis shows the load current, and the vertical axis shows the operation time until a circuit breaker.
Normally, the rated current value of the upper circuit breaker A is a rated current value larger than the sum of the current values IB1, IB2, and IB3 flowing in the lower circuit breakers B1 , B2 , and B3 in a steady state. Is selected. As shown in FIG. 12, the steady-state current values IB1, IB2, and IB3 of the lower circuit breakers B1 , B2 , and B3 are IB1 = 60A, IB2 = 15A, and IB3 = 15A, respectively. In some cases, the steady-state current value IA of the upper circuit breaker A is IA = 90A, so for example, 100A is selected as the rated current value of the upper circuit breaker A. Further, as shown in FIG. 13, the operation characteristic curve of the upper circuit breaker A is also higher than the operation characteristic curve of the lower circuit breakers B1, B2, and B3, that is, the operation time until the circuit breaker is higher. The circuit breaker A is set to be longer.
By selecting the rated current and setting the operating characteristic curve in this way, even if the current flowing through one lower circuit breaker becomes overloaded, it is installed on the immediate upper side of the overloaded circuit. The circuit breaker that is used protects the electric circuit wire from overload current by performing a cutoff operation according to its operating characteristic curve, so that a healthy circuit in which a steady-state current is flowing is supplied with electricity without being cut off. Continue to be done.

ところが、今、下位の回路遮断器Ｂ１、Ｂ２、Ｂ３には定常状態の電流が流れている状態から、下位の回路遮断器Ｂ１に流れる負荷電流が過負荷の１００Ａに増加したとする。
そうすると、図１３に示すように、下位の回路遮断器Ｂ１が遮断を行うまでの動作時間は、ＩＢ１ ＝１００Ａ時のｔ２秒となる。それに対して、上位の回路遮断器Ａに流れる電流値ＩＡは、ＩＢ１＋ＩＢ２＋ＩＢ３よりＩＡ＝１３０Ａとなるので、上位の回路遮断器Ａが遮断動作を行うまでの動作時間は、ｔ１秒となる。
上位の回路遮断器Ａの動作時間ｔ１と下位の回路遮断器Ｂ１の動作時間ｔ２の関係が、ｔ２＞ｔ１となるため、上位の回路遮断器Ａが下位の回路遮断器Ｂ１より先に動作してしまうこととなり、健全なその他の下位の回路遮断器Ｂ２、Ｂ３の回路の電源まで喪失してしまうという問題が発生する場合がある。 However, it is assumed that the load current flowing through the lower circuit breaker B1 has increased from the state in which the steady-state current is flowing through the lower circuit breakers B1, B2, and B3 to the overload of 100A.
Then, as shown in FIG. 13, the operation time until the lower circuit breaker B1 cuts off is t2 seconds when IB 1 = 100 A. On the other hand, the current value IA flowing through the upper circuit breaker A is IA = 130A from IB1 + IB2 + IB3, so that the operating time until the upper circuit breaker A performs the breaking operation is It will be t1 second.
Since the relationship between the operating time t1 of the upper circuit breaker A and the operating time t2 of the lower circuit breaker B1 is t2> t1, the upper circuit breaker A operates before the lower circuit breaker B1. This may result in the loss of power to the circuits of other sound circuit breakers B2 and B3.

この発明は、前述のような負荷状況においても、健全な回路を停電させることなく異常な回路のみを先にトリップ動作させることができる電子式回路遮断器を提供するものである。 The present invention provides an electronic circuit breaker capable of tripping only an abnormal circuit first without interrupting a sound circuit even under the load condition as described above.

この発明に係る電子式回路遮断器は、電路に挿入される開閉接点と、電路に流れる電流を検出する電流検出器と、電流検出器が検出した検出電流の実効値を所定の演算周期で算出し、実効値が定格電流に対応する第１の所定値を超えた期間における実効値の２乗値と演算周期との積を累積した累積電流値を算出するとともに、累積電流値に基づいて開閉接点を開離させる制御装置と、を有し、制御装置は、検出電流から開閉接点を開離させるまでの残時間を算出する残時間演算部と、他の回路遮断器に接続され、他の回路遮断器の残時間である上位残時間が入力される上位残時間入力回路と、残時間、上位残時間および累積電流値に基づき開閉接点を開離させるかどうかを判定するトリップ判定部と、を備えたものである。 The electronic circuit breaker according to the present invention calculates the effective value of the open / close contact inserted in the electric circuit, the current detector that detects the current flowing in the electric circuit, and the detected current detected by the current detector in a predetermined calculation cycle. Then, the cumulative current value obtained by accumulating the product of the squared value of the effective value and the calculation cycle in the period when the effective value exceeds the first predetermined value corresponding to the rated current is calculated, and the switch is opened / closed based on the cumulative current value. It has a control device that opens and closes the contacts, and the control device is connected to another circuit breaker and is connected to another circuit breaker and another remaining time calculation unit that calculates the remaining time from the detected current to the opening and closing of the switching contact. An upper remaining time input circuit that inputs the upper remaining time, which is the remaining time of the circuit breaker, and a trip determination unit that determines whether to open / close the switching contact based on the remaining time, the upper remaining time, and the cumulative current value. It is equipped with.

この発明に係る電子式回路遮断器によれば、健全な回路を停電させることなく異常な回路のみを先に遮断させることができる。 According to the electronic circuit breaker according to the present invention, only an abnormal circuit can be cut off first without causing a power failure of a sound circuit.

本発明の実施の形態１における電子式回路遮断器を示すブロック図である。It is a block diagram which shows the electronic circuit breaker in Embodiment 1 of this invention. 図１に示す電子式回路遮断器におけるマイクロコンピュータの機能を示す機能ブロック図である。It is a functional block diagram which shows the function of the microcomputer in the electronic circuit breaker shown in FIG. 実施の形態１における電子式回路遮断器のサンプリングによる電流の実効値を得る方法を説明するための説明図である。It is explanatory drawing for demonstrating the method of obtaining the effective value of the current by sampling of the electronic circuit breaker in Embodiment 1. FIG. 実施の形態１におけるマイクロコンピュータの処理を示すフローチャートである。It is a flowchart which shows the processing of the microcomputer in Embodiment 1. 図１に示す上位残時間入力回路および残時間出力回路における残時間の伝達方法を説明するための説明図で、（ａ）はパルス幅による方法、（ｂ）はアナログ電圧による方法、（ｃ）はパルスの周波数による方法である。An explanatory diagram for explaining a method of transmitting the remaining time in the upper remaining time input circuit and the remaining time output circuit shown in FIG. 1, where (a) is a method using a pulse width, (b) is a method using an analog voltage, and (c). Is a pulse frequency method. 本発明の実施の形態２に係る電子式回路遮断器を示すブロック図である。It is a block diagram which shows the electronic circuit breaker which concerns on Embodiment 2 of this invention. 図６に示す電子式回路遮断器におけるマイクロコンピュータの機能を示す機能ブロック図である。It is a functional block diagram which shows the function of the microcomputer in the electronic circuit breaker shown in FIG. 実施の形態２におけるマイクロコンピュータの処理を示すフローチャートである。It is a flowchart which shows the processing of the microcomputer in Embodiment 2. 本発明の実施の形態３に係る電子式回路遮断器を示すブロック図である。It is a block diagram which shows the electronic circuit breaker which concerns on Embodiment 3 of this invention. 図９に示す電子式回路遮断器におけるマイクロコンピュータの機能を示す機能ブロック図である。It is a functional block diagram which shows the function of the microcomputer in the electronic circuit breaker shown in FIG. 実施の形態３におけるマイクロコンピュータの処理を示すフローチャートである。It is a flowchart which shows the processing of the microcomputer in Embodiment 3. FIG. 従来の回路遮断器の課題を説明するための図で、一般的な上位の回路遮断器と下位の回路遮断器の接続例を示す図である。It is a figure for demonstrating the problem of the conventional circuit breaker, and is the figure which shows the connection example of the general upper circuit breaker and the lower circuit breaker. 従来の上位および下位の回路遮断器における動作特性曲線がそれぞれ示された保護協調特性を示す図である。It is a figure which shows the protection coordination characteristic which showed the operation characteristic curve in the conventional upper circuit breaker and the lower circuit breaker respectively.

以下、この発明に係る電子式回路遮断器の実施の形態について図面を用いて説明する。なお、各図において同一符号は同一、若しくは相当部分を示している。 Hereinafter, embodiments of the electronic circuit breaker according to the present invention will be described with reference to the drawings. In each figure, the same reference numerals indicate the same or corresponding parts.

実施の形態１．
図１はこの発明の実施の形態１に係る電子式回路遮断器を示すブロック図、図２は図１に示す電子式回路遮断器におけるマイクロコンピュータの機能を示す機能ブロック図、図３はサンプリングによる電流の実効値を得る方法を説明するための説明図、図４はマイクロコンピュータの処理を示すフローチャート、図５は図１に示す上位残時間入力回路および残時間出力回路における残時間の伝達方法を説明するための説明図で、（ａ）はパルス幅による方法、（ｂ）はアナログ電圧による方法、（ｃ）はパルスの周波数による方法である。Embodiment 1.
FIG. 1 is a block diagram showing an electronic circuit breaker according to the first embodiment of the present invention, FIG. 2 is a functional block diagram showing the function of a microcomputer in the electronic circuit breaker shown in FIG. 1, and FIG. 3 is a sampling. An explanatory diagram for explaining a method for obtaining an effective value of a current, FIG. 4 is a flowchart showing processing of a microcomputer, and FIG. 5 shows a method of transmitting the remaining time in the upper remaining time input circuit and the remaining time output circuit shown in FIG. In the explanatory diagram for explanation, (a) is a method by a pulse width, (b) is a method by an analog voltage, and (c) is a method by a pulse frequency.

図１に示すように、本実施の形態における電子式回路遮断器１００は、交流電路１に挿入され交流電路１を開閉する開閉接点２と、交流電路１に設けられ、交流電路１に流れる負荷電流に比例した検出電流を出力する電流検出器３と、この電流検出器３の二次側に接続され、検出電流を整流する整流回路４と、この整流回路４から出力された電流により電子式回路遮断器内部の電子回路の動作に用いる一定の電圧を出力する電源回路５と、整流回路４の出力側に接続され、電流検出器３の検出電流をアナログ電圧信号に変換する波形変換回路６と、この波形変換回路６のアナログ電圧信号に基づき引外し特性の処理を行う制御装置としてのマイクロコンピュータ１０（以下、マイコン１０という）と、マイコン１０からの各引外し信号により引外し装置８を駆動し開閉接点２を開離させる引外し回路７と、から構成されている。 As shown in FIG. 1, the electronic circuit breaker 100 according to the present embodiment is provided with an opening / closing contact 2 inserted into the AC electric circuit 1 to open / close the AC electric circuit 1, and a load flowing through the AC electric circuit 1 provided in the AC electric circuit 1. A current detector 3 that outputs a detection current proportional to the current, a rectifying circuit 4 that is connected to the secondary side of the current detector 3 and rectifies the detected current, and an electronic type that uses the current output from the rectifying circuit 4. A power supply circuit 5 that outputs a constant voltage used for the operation of the electronic circuit inside the circuit breaker, and a waveform conversion circuit 6 that is connected to the output side of the rectifier circuit 4 and converts the detected current of the current detector 3 into an analog voltage signal. The microcomputer 10 (hereinafter referred to as the microcomputer 10) as a control device that processes the trip characteristics based on the analog voltage signal of the waveform conversion circuit 6, and the trip device 8 by each trip signal from the microcomputer 10. It is composed of a trip circuit 7 that drives and opens / closes the open / close contact 2.

マイコン１０は、マイクロコンピュータを構成するＣＰＵ(central processing unit)１１、ＲＯＭ(read‐only memory)１２、及びＲＡＭ(random access memory)１３と、波形変換回路６のアナログ電圧信号をディジタル信号に変換するＡ／Ｄ(Analog to digital)変換回路１４と、配電線路の上位側に設けられた電子式回路遮断器に接続され、上位の電子式回路遮断器からの上位残時間が入力される上位残時間入力回路１５と、詳細は後述する引外し信号が出力されるまでの残時間を配電線路の下位側に設けられた電子式回路遮断器に出力する残時間出力回路１６と、トリップ判定部１８ｄからの引外し信号の出力に基づき、引外し回路７を駆動する引外し出力ポート１７と、から構成されている。 The microcomputer 10 converts an analog voltage signal of a CPU (central processing unit) 11, a ROM (read-only memory) 12, a RAM (random access memory) 13 constituting a microcomputer, and a waveform conversion circuit 6 into a digital signal. Upper remaining time connected to the A / D (Analog to digital) conversion circuit 14 and the electronic circuit breaker provided on the upper side of the distribution line, and the upper remaining time from the upper electronic circuit breaker is input. From the input circuit 15, the remaining time output circuit 16 that outputs the remaining time until the trip signal, which will be described later in detail, to the electronic circuit breaker provided on the lower side of the distribution line, and the trip determination unit 18d. It is composed of a tripping output port 17 for driving a tripping circuit 7 based on the output of the tripping signal of.

次に、マイコン１０のソフトウェアで処理を行う機能ブロックについて説明する。
図２に示すように、マイコン１０のＣＰＵ１１によるソフトウェア処理１８は、Ａ／Ｄ変換回路１４が出力するディジタル信号に基づき交流電路１を流れる電流の実効値を演算する実効値演算部１８ａと、実効値演算部１８ａが算出した電流の実効値に基づいて時限特性の処理を行い、累積電流値ＬＴＤを算出するＬＴＤ時限特性演算部１８ｂと、ＬＴＤ時限特性演算部１８ｂから取得した累積電流値ＬＴＤに基づき、引外し信号が出力されるまでの残時間を算出する残時間演算部１８ｃと、ＬＴＤ時限特性演算部１８ｂから取得した累積電流値ＬＴＤ、残時間演算部１８ｃから取得した残時間Ｒ１、および上位残時間入力回路１５から取得した上位残時間Ｒ２に基づき、開閉接点２を開離させる指示を引外し出力ポート１７に行うトリップ判定部１８ｄと、から構成されている。Next, a functional block that is processed by the software of the microcomputer 10 will be described.
As shown in FIG. 2, the software processing 18 by the CPU 11 of the microcomputer 10 includes an effective value calculation unit 18a that calculates the effective value of the current flowing through the AC electric circuit 1 based on the digital signal output by the A / D conversion circuit 14. To the LTD timed characteristic calculation unit 18b that processes the timed characteristic based on the effective value of the current calculated by the value calculation unit 18a and calculates the cumulative current value LTD, and the cumulative current value LTD acquired from the LTD timed characteristic calculation unit 18b. Based on this, the remaining time calculation unit 18c that calculates the remaining time until the trip signal is output, the cumulative current value LTD acquired from the LTD timed characteristic calculation unit 18b, and the remaining time R1 acquired from the remaining time calculation unit 18c, It is also composed of a trip determination unit 18d that disconnects an instruction to open / close the open / close contact 2 and gives an instruction to the output port 17 based on the upper remaining time R2 acquired from the upper remaining time input circuit 15.

次に、マイコン１０内の実効値演算部１８ａの処理について説明する。
まず、負荷電流の実効値の演算方法について図３により説明する。電流検出器３で検出された交流電路１の検出電流は、波形変換回路６で検出電流に基づくアナログ電圧信号に変換された後、Ａ／Ｄ変換回路１４でアナログ電圧信号からディジタル値へ変換される。この検出電流の検出周期、すなわち、サンプリング周期はΔｔである。実効値演算部１８ａでは、交流電路１を流れる負荷電流の実効値を得る必要から、交流電路１の交流電源周波数が、例えば、５０Ｈｚの場合には５周期に相当、６０Ｈｚの場合には６周期に相当する１００ｍｓｅｃ間、サンプリングされるディジタル値の２乗移動平均、すなわち、ディジタル値の２乗を累積しサンプリング数ｍで割ることで算出される実効値Ｉ２＝（Σｉ２）／ｍを求める。なお、実効値Ｉ２の演算は、例えば、１０ｍｓｅｃ～２５ｍｓｅｃの演算周期ΔＴで行われる。また、実際には、実効値Ｉ２の平方根が負荷電流の実効値であるが、ここでは、Ｉ２を実効値として称し取り扱う。Next, the processing of the effective value calculation unit 18a in the microcomputer 10 will be described.
First, a method of calculating the effective value of the load current will be described with reference to FIG. The detected current of the AC electric circuit 1 detected by the current detector 3 is converted into an analog voltage signal based on the detected current by the waveform conversion circuit 6, and then converted from the analog voltage signal to a digital value by the A / D conversion circuit 14. To. The detection cycle of this detection current, that is, the sampling cycle is Δt. Since the effective value calculation unit 18a needs to obtain the effective value of the load current flowing through the AC electric circuit 1, for example, when the AC power supply frequency of the AC electric circuit 1 is 50 Hz, it corresponds to 5 cycles, and when it is 60 Hz, it corresponds to 6 cycles. For 100 msec corresponding to, the squared moving average of the digital values sampled, that is, the effective value I 2 = (Σi 2 ) / m calculated by accumulating the squares of the digital values and dividing by the number of samples m is obtained. .. The calculation of the effective value I 2 is performed, for example, in the calculation cycle ΔT of 10 msec to 25 msec. Further, in reality, the square root of the effective value I 2 is the effective value of the load current, but here, I 2 is referred to as the effective value and treated.

次に、ＬＴＤ時限特性演算部１８ｂ、残時間演算部１８ｃ、およびトリップ判定部１８ｄの処理について説明する。
図４に示すように、電源回路５からの電源によりマイコン１０が起動すると、まず、ステップＳ１０１では、実効値Ｉ２の演算を行い、ステップＳ１０２に進む。このステップＳ１０１の処理が前述の実効値演算部１８ａの処理となる。
ステップＳ１０２では、ステップＳ１０１で算出した実効値Ｉ２が、第1の所定値、例えば、定格電流設定値Ｉ０ ２より大きいかどうかを判定し、実効値Ｉ２が第１の所定値より大きい場合にはステップＳ１０３に進み、実効値Ｉ２が第１の所定値以下の場合にはステップＳ１０４に進む。Next, the processing of the LTD timed characteristic calculation unit 18b, the remaining time calculation unit 18c, and the trip determination unit 18d will be described.
As shown in FIG. 4, when the microcomputer 10 is started by the power supply from the power supply circuit 5, first, in step S101, the calculation of the effective value I 2 is performed, and the process proceeds to step S102. The process of step S101 is the process of the above-mentioned effective value calculation unit 18a.
In step S102, it is determined whether or not the effective value I 2 calculated in step S101 is larger than the first predetermined value, for example, the rated current set value I 0 2 , and the effective value I 2 is larger than the first predetermined value. In that case, the process proceeds to step S103, and if the effective value I 2 is equal to or less than the first predetermined value, the process proceeds to step S104.

ステップＳ１０３では、実効値Ｉ２が定格電流設定値Ｉ０ ２より大きいので、式（１）に従い、累積電流値ＬＴＤの加算処理を行い、ステップＳ１０５に進む。
ＬＴＤ＝前回ＬＴＤ＋（ΔＴ×Ｉ２） ・・・（１）
ステップＳ１０４では、実効値Ｉ２が第１の所定値以下なので、式（２）に従い、累積電流値ＬＴＤの減算処理を行い、ステップＳ１０１に戻る。
ＬＴＤ＝ＬＴＤの前回値－ΔＴ×（Ｉ０ ２－Ｉ２） ・・・（２）
なお、ΔＴは、前述の通り実効値演算部１８ａにおいて実効値Ｉ２が算出される演算周期であり、通常、固定値となるので、ソフトウェア的には演算を簡略化するため、ΔＴ＝１として処理しても良い。In step S103, since the effective value I 2 is larger than the rated current set value I 02 , the cumulative current value LTD is added according to the equation (1), and the process proceeds to step S105.
LTD = Last LTD + (ΔT × I 2 ) ・ ・ ・ (1)
In step S104, since the effective value I 2 is equal to or less than the first predetermined value, the cumulative current value LTD is subtracted according to the equation (2), and the process returns to step S101.
Previous value of LTD = LTD −ΔT × (I 0 2 −I 2 ) ・ ・ ・ (2)
As described above, ΔT is an operation cycle in which the effective value I 2 is calculated by the effective value calculation unit 18a, and is usually a fixed value. Therefore, in order to simplify the operation in terms of software, ΔT = 1 is set. May be processed.

ステップＳ１０５では、実効値Ｉ２が第１の所定値より大きい状態なので、累積電流値ＬＴＤがトリップ閾値Ｋに達し、電子式回路遮断器１００が遮断するまでの時間である残時間Ｒ１の算出を行いステップＳ１０６に進む。
残時間Ｒ１の算出方法の具体例としては、式（３）、式（４）、式（５）にそれぞれ示す計算式が考えられる。
Ｒ１＝Ｋ／Ｉ２－ΣΔＴ ・・・（３）
Ｒ１＝（Ｋ－ＬＴＤ）／Ｉ２ ・・・（４）
Ｒ１＝Ｋ－ＬＴＤ ・・・（５）
ここで、式（３）のΣΔＴは、実効値Ｉ２が定格電流設定値Ｉ０ ２より大きい状態が継続している時間を示している。In step S105, since the effective value I 2 is larger than the first predetermined value, the calculation of the remaining time R 1 which is the time until the cumulative current value LTD reaches the trip threshold value K and the electronic circuit breaker 100 cuts off. To step S106.
As a specific example of the calculation method of the remaining time R 1 , the calculation formulas shown in the formula (3), the formula (4), and the formula (5) can be considered.
R 1 = K / I 2 -ΣΔT ・ ・ ・ (3)
R 1 = (K-LTD) / I 2 ... (4)
R 1 = K-LTD ・ ・ ・ (5)
Here, ΣΔT in the equation (3) indicates the time during which the effective value I 2 is larger than the rated current set value I 02.

ステップＳ１０６では、ステップＳ１０５で算出した残時間Ｒ１を残時間出力回路１６から出力し、ステップＳ１０７に進む。
ステップＳ１０７では、累積電流値ＬＴＤがトリップ閾値Ｋ以上になったかどうかの判定を行う。累積電流値ＬＴＤがトリップ閾値Ｋ以上の場合には、即刻、開閉接点２を遮断すべきなので、ステップＳ１０９に進み、引外し出力ポート１７の信号ＳをＨレベルとすることで、引外し回路７を駆動し引外し装置８を動作させることにより開閉接点２を開離し交流電路１を開放する。In step S106, the remaining time R1 calculated in step S105 is output from the remaining time output circuit 16, and the process proceeds to step S107.
In step S107, it is determined whether or not the cumulative current value LTD is equal to or greater than the trip threshold value K. When the cumulative current value LTD is equal to or higher than the trip threshold value K, the open / close contact 2 should be shut off immediately. By driving and operating the tripping device 8, the opening / closing contact 2 is opened and the AC electric circuit 1 is opened.

一方、累積電流値ＬＴＤがトリップ閾値Ｋ未満の場合にはステップＳ１０８に進む。
ステップＳ１０８では、ステップＳ１０５で算出した残時間Ｒ１が第２の所定値より大きいかどうかを判定する。残時間Ｒ１が所定値より大きい場合にはステップＳ１０１に戻り、残時間Ｒ１が所定値以下の場合にはステップＳ１１０に進む。
ステップＳ１１０では、上位残時間入力回路１５に入力された上位の電子式回路遮断器２００の残時間である上位残時間Ｒ２を読み込み、ステップＳ１１１に進む。 On the other hand, if the cumulative current value LTD is less than the trip threshold value K, the process proceeds to step S108.
In step S108, it is determined whether or not the remaining time R1 calculated in step S105 is larger than the second predetermined value. If the remaining time R1 is larger than the predetermined value, the process returns to step S101, and if the remaining time R1 is equal to or less than the predetermined value, the process proceeds to step S110.
In step S110, the upper remaining time R2, which is the remaining time of the upper electronic circuit breaker 200 input to the upper remaining time input circuit 15, is read, and the process proceeds to step S111.

ステップＳ１１１では、残時間Ｒ１が上位残時間Ｒ２以上かを判定する。残時間Ｒ１が上位残時間Ｒ２以上の場合にはステップＳ１０９に進み、残時間Ｒ１が上位残時間Ｒ２未満の場合にはステップＳ１０１に戻る。
ステップＳ１０８で、残時間Ｒ１が所定値より大きいか動作を判定した理由は、残時間Ｒ１が上位残時間Ｒ２より大きいかどうかだけで遮断動作を行う判定を行った場合、まだ、遮断動作までの残時間が非常に長い場合、例えば残時間Ｒ１が１０分で、上位残時間Ｒ２が１１分といった状況においても遮断動作を行ってしまう可能性があるからである。In step S111, it is determined whether the remaining time R 1 is equal to or higher than the upper remaining time R 2 . If the remaining time R 1 is the upper remaining time R 2 or more, the process proceeds to step S109, and if the remaining time R 1 is less than the upper remaining time R 2 , the process returns to step S101.
The reason why the operation is determined whether the remaining time R 1 is larger than the predetermined value in step S108 is that when the determination to perform the blocking operation is performed only by whether the remaining time R 1 is larger than the upper remaining time R 2 , the blocking operation is still performed. This is because if the remaining time until the operation is very long, for example, the shutoff operation may be performed even in a situation where the remaining time R 1 is 10 minutes and the upper remaining time R 2 is 11 minutes.

次に、上位の電子式回路遮断器と下位の電子式回路遮断器との間における残時間の伝達方法、すなわち、残時間出力回路１６と上位残時間入力回路１５の詳細について図５により説明する。
残時間の伝達方法としては、上位の電子式回路遮断器と下位の電子式回路遮断器とを信号線で接続し、残時間を伝送する方法が考えられる。具体的には、図５（ａ）に示すような残時間に応じたパルス幅を例えば０ｍｓｅｃから１０ｍｓｅｃで変化させる方法、図５（ｂ）に示すような残時間に応じてアナログ電圧信号を０．５Ｖから５Ｖで変化させる方法、図５（ｃ）に示すような残時間に応じて周波数を例えば、１００Ｈｚから１０ｋＨｚに変化させる方法などである。Next, the method of transmitting the remaining time between the upper electronic circuit breaker and the lower electronic circuit breaker, that is, the details of the remaining time output circuit 16 and the upper remaining time input circuit 15 will be described with reference to FIG. ..
As a method of transmitting the remaining time, a method of connecting an upper electronic circuit breaker and a lower electronic circuit breaker with a signal line and transmitting the remaining time can be considered. Specifically, a method of changing the pulse width according to the remaining time as shown in FIG. 5A from, for example, 0 msec to 10 msec, and an analog voltage signal of 0 according to the remaining time as shown in FIG. 5B. A method of changing from .5 V to 5 V, a method of changing the frequency from, for example, 100 Hz to 10 kHz according to the remaining time as shown in FIG. 5 (c).

また、上位の電子式回路遮断器と下位の電子式回路遮断器とは交流電路１で接続されているので、交流電路１に、残時間に応じたパルスを重畳し、例えばパルス幅を０ｍｓｅｃから１０ｍｓｅｃで変化させる方法なども考えられる。 Further, since the upper electronic circuit breaker and the lower electronic circuit breaker are connected by the AC electric circuit 1, a pulse corresponding to the remaining time is superimposed on the AC electric circuit 1, for example, the pulse width is from 0 msec. A method of changing in 10 msec is also conceivable.

本実施の形態によれば、交流電路１に挿入された開閉接点２と、交流電路１に流れる電流を検出する電流検出器３と、電流検出器３の検出電流の実効値を所定の検出周期で検出し、検出電流の実効値が定格電流に対応する第１の所定値を超えた期間における検出電流の実効値の２乗値と検出周期との積を累積した累積電流値ＬＴＤを算出するとともに、この累積電流値に基づいて開閉接点２を開離させるマイクロコンピュータ１０と、を有し、マイクロコンピュータ１０は、検出電流から開閉接点２を開離させるまでの残時間Ｒ１を算出する残時間演算部と、他の電子式回路遮断器に接続され、他の電子式回路遮断器の残時間Ｒ１である上位残時間Ｒ２が入力される上位残時間入力回路１５と、残時間Ｒ１、上位残時間Ｒ２、および累積電流値ＬＴＤに基づき開閉接点２を開離させるかどうかを判定するトリップ判定部１８ｄと、を備えたので、過負荷状態を検出した状態において、電子式回路遮断器１００は、上位の電子式回路遮断器２００よりも先に遮断動作を行うことができる。According to the present embodiment, the open / close contact 2 inserted in the AC electric circuit 1, the current detector 3 for detecting the current flowing in the AC electric circuit 1, and the effective value of the detected current of the current detector 3 are determined in a predetermined detection cycle. Calculates the cumulative current value LTD, which is the cumulative product of the squared value of the effective value of the detected current and the detection cycle during the period when the effective value of the detected current exceeds the first predetermined value corresponding to the rated current. It also has a microcomputer 10 that opens and closes the open / close contact 2 based on this cumulative current value, and the microcomputer 10 calculates the remaining time R1 from the detected current until the open / close contact 2 is opened. The upper remaining time input circuit 15 connected to the time calculation unit and another electronic circuit breaker, and the upper remaining time R 2 which is the remaining time R 1 of the other electronic circuit breaker is input, and the remaining time R. 1. The upper remaining time R2 and the trip determination unit 18d for determining whether to open / close the open / close contact 2 based on the cumulative current value LTD are provided, so that an electronic circuit is provided in a state where an overload state is detected. The breaker 100 can perform a break operation before the higher-level electronic circuit breaker 200.

また、トリップ判定部１８ｄは、検出電流の実効値が第１の所定値を超えた場合に、残時間Ｒ１と上位残時間Ｒ２との比較を行い、残時間Ｒ１が上位残時間Ｒ２より大きい値のとき、開閉接点２を開離させるので、過負荷状態を検出した状態において、電子式回路遮断器１００は、上位の電子式回路遮断器２００よりも先に遮断動作を行うことができる。Further, the trip determination unit 18d compares the remaining time R 1 with the upper remaining time R 2 when the effective value of the detected current exceeds the first predetermined value, and the remaining time R 1 is the upper remaining time R. When the value is larger than 2 , the open / close contact 2 is opened and closed. Therefore, in the state where the overload state is detected, the electronic circuit breaker 100 performs the breaking operation before the higher-level electronic circuit breaker 200. Can be done.

また、トリップ判定部１８ｄは、残時間Ｒ１が第２の所定値より大きい場合に、残時間Ｒ１と上位残時間Ｒ２との比較を行うので、まだ遮断まで十分長い時間がある場合に、電子式回路遮断器１００が不要の遮断動作を行うことがない。Further, the trip determination unit 18d compares the remaining time R 1 with the higher remaining time R 2 when the remaining time R 1 is larger than the second predetermined value, so that there is still a sufficiently long time until the cutoff. , The electronic circuit breaker 100 does not perform an unnecessary breaking operation.

また、残時間演算部１８ｃで算出した残時間Ｒ１を出力する残時間出力回路１６を備えたので、自身より下位の電子式回路遮断器３０１、３０２に対し、自身の残時間Ｒ１を出力することで、自身が下位の電子式回路遮断器３０１、３０２より先に遮断動作を行うことを防止することができる。Further, since the remaining time output circuit 16 for outputting the remaining time R1 calculated by the remaining time calculation unit 18c is provided, the remaining time R1 is output to the electronic circuit breakers 301 and 302 lower than itself. By doing so, it is possible to prevent the circuit breaker itself from performing the breaking operation before the lower electronic circuit breakers 301 and 302.

実施の形態２．
次に、この発明の実施の形態２における電子式回路遮断器１０１について説明する。
図６は実施の形態２における電子式回路遮断器のブロック図、図７は図６に示す電子式回路遮断器におけるマイクロコンピュータの機能を示す機能ブロック図、図８はマイクロコンピュータの処理を示すフローチャートである。Embodiment 2.
Next, the electronic circuit breaker 101 according to the second embodiment of the present invention will be described.
6 is a block diagram of the electronic circuit breaker according to the second embodiment, FIG. 7 is a functional block diagram showing the function of the microcomputer in the electronic circuit breaker shown in FIG. 6, and FIG. 8 is a flowchart showing the processing of the microcomputer. Is.

本実施の形態は、図６、７に示すように、実施の形態１では設けられていた残時間出力回路１６を削除したものである。同様に、図８に示すように、マイクロコンピュータの処理においても実施の形態１では設けていたステップＳ１０６を削除している。その他の構成については実施の形態１と同様であるので、実施の形態１と同様の機能を有する構成要素については同一符号を付して説明を省略する。 In this embodiment, as shown in FIGS. 6 and 7, the remaining time output circuit 16 provided in the first embodiment is deleted. Similarly, as shown in FIG. 8, in the processing of the microcomputer, the step S106 provided in the first embodiment is deleted. Since other configurations are the same as those in the first embodiment, the components having the same functions as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

本実施の形態によれば、電源系統の下位に接続される電子式回路遮断器においては、自身より下位に回路遮断器が存在しない場合がある。その場合、残時間を下位の電子式回路遮断器に出力する必要がないので、本実施の形態で示す残時間出力回路がない電子式回路遮断器を採用することで、回路遮断器システムの低コスト化を図ることができる。 According to this embodiment, in the electronic circuit breaker connected to the lower part of the power supply system, the circuit breaker may not exist below itself. In that case, it is not necessary to output the remaining time to a lower-level electronic circuit breaker. Therefore, by adopting an electronic circuit breaker having no remaining time output circuit shown in the present embodiment, the circuit breaker system can be lowered. It is possible to reduce the cost.

また、交流電路１に挿入された開閉接点２と、交流電路１に流れる電流を検出する電流検出器３と、電流検出器３の検出電流を所定の検出周期で検出し、検出電流が定格電流に対応する第１の所定値を超えた期間における検出電流の実効値の２乗値と検出周期との積を累積した累積電流値ＬＴＤを算出するとともに、この累積電流値に基づいて開閉接点２を開離させるマイクロコンピュータ１０と、を有し、マイクロコンピュータ１０は、検出電流から開閉接点２を開離させるまでの残時間Ｒ１を算出する残時間演算部と、他の電子式回路遮断器に接続され、他の電子式回路遮断器の残時間Ｒ１である上位残時間Ｒ２が入力される上位残時間入力回路１５と、残時間Ｒ１、上位残時間Ｒ２、および累積電流値ＬＴＤに基づき開閉接点２を開離させるかどうかを判定するトリップ判定部１８ｄと、を備えたので、過負荷状態を検出した状態において、電子式回路遮断器１０１は、上位の電子式回路遮断器２００よりも先に遮断動作を行うことができる。Further, the switching contact 2 inserted in the AC electric circuit 1, the current detector 3 for detecting the current flowing in the AC electric circuit 1, and the detection current of the current detector 3 are detected in a predetermined detection cycle, and the detected current is the rated current. The cumulative current value LTD, which is the cumulative product of the squared value of the effective value of the detected current and the detection cycle in the period corresponding to the first predetermined value, is calculated, and the open / close contact 2 is based on this cumulative current value. The microcomputer 10 has a microcomputer 10 for calculating the remaining time R1 from the detected current until the switching contact 2 is opened, and another electronic circuit breaker. The upper remaining time input circuit 15 connected to the other electronic circuit breaker and inputting the upper remaining time R 2 which is the remaining time R 1 , the remaining time R 1 , the upper remaining time R 2 , and the cumulative current value. Since the trip determination unit 18d for determining whether to open / close the open / close contact 2 based on the LTD is provided, the electronic circuit breaker 101 is a higher-level electronic circuit breaker in the state where the overload state is detected. The cutoff operation can be performed before 200.

また、トリップ判定部１８ｄは、残時間Ｒ１が第２の所定値より大きい場合に、残時間Ｒ１と上位残時間Ｒ２との比較を行うので、まだ遮断まで十分長い時間がある場合に、電子式回路遮断器１０１が不要の遮断動作を行うことがない。Further, the trip determination unit 18d compares the remaining time R 1 with the higher remaining time R 2 when the remaining time R 1 is larger than the second predetermined value, so that there is still a sufficiently long time until the cutoff. , The electronic circuit breaker 101 does not perform an unnecessary breaking operation.

実施の形態３．
次に、この発明の実施の形態３における電子式回路遮断器１０２について説明する。
図９は実施の形態３における電子式回路遮断器のブロック図、図１０は図９に示す電子式回路遮断器におけるマイクロコンピュータの機能を示す機能ブロック図、図１１はマイクロコンピュータの処理を示すフローチャートである。Embodiment 3.
Next, the electronic circuit breaker 102 according to the third embodiment of the present invention will be described.
9 is a block diagram of the electronic circuit breaker according to the third embodiment, FIG. 10 is a functional block diagram showing the function of the microcomputer in the electronic circuit breaker shown in FIG. 9, and FIG. 11 is a flowchart showing the processing of the microcomputer. Is.

実施の形態１では、下位の電子式回路遮断器に出力する残時間は、必ず自身の残時間であった。そうすると、自身の残時間が上位残時間より長い場合、自身より下位の遮断器よりも先にトリップしてしまう可能性がある。
本実施の形態は、実施の形態１における残時間出力回路１６を最小残時間出力回路１９に変更し、実施の形態１のソフトウェア処理も変更したもので、実施の形態１と同様に、上位残時間入力回路は備えている。実施の形態１と同様の機能を有する構成要素については同一符号を付して説明を省略し、実施の形態１と異なる点を中心に説明する。In the first embodiment, the remaining time output to the lower electronic circuit breaker is always its own remaining time. Then, if the remaining time of itself is longer than the upper remaining time, it may trip before the circuit breaker lower than itself.
In the present embodiment, the remaining time output circuit 16 in the first embodiment is changed to the minimum remaining time output circuit 19, and the software processing of the first embodiment is also changed. It has a time input circuit. The components having the same functions as those of the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the points different from those of the first embodiment will be mainly described.

電子式回路遮断器１０２におけるブロック図である図９において、実施の形態１の図１との異なる点は、実施の形態１の残時間出力回路１６が最小残時間出力回路１９に変更されていることである。その他の構成については、実施の形態１の図１と同様なので説明は省略する。
また、電子式回路遮断器１０２におけるマイクロコンピュータの機能を示す機能ブロック図である図１０において、実施の形態１の図２との異なる点は、残時間演算部１８ｃからの出力が、残時間Ｒ１から最小残時間Ｒ３に変更されていることである。その他の構成については、実施の形態１の図２と同様なので説明は省略する。In FIG. 9, which is a block diagram of the electronic circuit breaker 102, the difference from FIG. 1 of the first embodiment is that the remaining time output circuit 16 of the first embodiment is changed to the minimum remaining time output circuit 19. That is. Since other configurations are the same as those in FIG. 1 of the first embodiment, the description thereof will be omitted.
Further, in FIG. 10, which is a functional block diagram showing the function of the microcomputer in the electronic circuit breaker 102, the difference from FIG. 2 of the first embodiment is that the output from the remaining time calculation unit 18c is the remaining time R. It means that the minimum remaining time R3 has been changed from 1 . Since other configurations are the same as those in FIG. 2 of the first embodiment, the description thereof will be omitted.

以下にソフトウェア処理の変更内容について説明する。
実施の形態１では、図４に示すステップＳ１０５で算出した遮断までの残時間Ｒ１をそのまま次のステップＳ１０６で、残時間出力回路１６から出力していた。
一方、図１１に示すように、本実施の形態の残時間演算部１８ｃでは、上位残時間入力回路１５から上位残時間Ｒ２を読み込み、自身で算出した残時間Ｒ１と上位残時間Ｒ２とを比較し、両者のうち小さい値を最小残時間Ｒ３として最小残時間出力回路１９から出力するようにしたものである。The changes in software processing will be described below.
In the first embodiment, the remaining time R1 until the cutoff calculated in step S105 shown in FIG. 4 is output as it is from the remaining time output circuit 16 in the next step S106.
On the other hand, as shown in FIG. 11, in the remaining time calculation unit 18c of the present embodiment, the upper remaining time R 2 is read from the upper remaining time input circuit 15, and the remaining time R 1 and the upper remaining time R 2 are calculated by themselves. The smaller value of the two is set as the minimum remaining time R3 and output from the minimum remaining time output circuit 19.

なお、本実施の形態では、最小残時間Ｒ３、残時間演算部１８ｃで算出されるものとして説明したが、残時間Ｒ１と上位残時間Ｒ２とを最小残時間出力回路１９に入力し、最小残時間出力回路１９で残時間Ｒ１と上位残時間Ｒ２とを比較し、両者のうち小さい値を最小残時間Ｒ３として最小残時間出力回路１９から出力するようにしてもよい。In this embodiment, the minimum remaining time R 3 and the remaining time calculation unit 18c have been described, but the remaining time R 1 and the upper remaining time R 2 are input to the minimum remaining time output circuit 19. The minimum remaining time output circuit 19 may compare the remaining time R1 and the upper remaining time R2 , and the smaller value of the two may be output from the minimum remaining time output circuit 19 as the minimum remaining time R3.

本実施の形態によれば、残時間演算部１８ｃにおいて、上位残時間入力回路１５から上位残時間Ｒ２を読み込み、残時間演算部１８ｃ自身で算出した残時間Ｒ１と上位残時間Ｒ２とを比較し、両者のうち小さい値を最小残時間Ｒ３として最小残時間出力回路１９から出力するようにしたので、電子式回路遮断器１０２は、自身の残時間Ｒ１が上位残時間Ｒ２より長い場合に、自身より下位の電子式回路遮断器３０１または３０２よりも先にトリップしてしまうことを防ぐことができる。According to the present embodiment, the remaining time calculation unit 18c reads the upper remaining time R 2 from the upper remaining time input circuit 15, and the remaining time R 1 and the upper remaining time R 2 calculated by the remaining time calculation unit 18c itself. The smaller value of the two is output from the minimum remaining time output circuit 19 as the minimum remaining time R3. Therefore , the electronic circuit breaker 102 has its own remaining time R1 as the upper remaining time R2 . If it is longer, it can be prevented from tripping before the electronic circuit breaker 301 or 302 lower than itself.

また、交流電路１に挿入された開閉接点２と、交流電路１に流れる電流を検出する電流検出器３と、電流検出器３の検出電流を所定の検出周期で検出し、検出電流が定格電流に対応する第１の所定値を超えた期間における検出電流の実効値の２乗値と検出周期との積を累積した累積電流値ＬＴＤを算出するとともに、この累積電流値に基づいて開閉接点２を開離させるマイクロコンピュータ１０と、を有し、マイクロコンピュータ１０は、検出電流から開閉接点２を開離させるまでの残時間Ｒ１を算出する残時間演算部と、他の電子式回路遮断器に接続され、他の電子式回路遮断器の残時間Ｒ１である上位残時間Ｒ２が入力される上位残時間入力回路１５と、残時間Ｒ１、上位残時間Ｒ２、および累積電流値ＬＴＤに基づき開閉接点２を開離させるかどうかを判定するトリップ判定部１８ｄと、を備えたので、過負荷状態を検出した状態において、電子式回路遮断器１０２は、上位の電子式回路遮断器２００よりも先に遮断動作を行うことができる。Further, the switching contact 2 inserted in the AC electric circuit 1, the current detector 3 for detecting the current flowing in the AC electric circuit 1, and the detection current of the current detector 3 are detected in a predetermined detection cycle, and the detected current is the rated current. The cumulative current value LTD, which is the cumulative product of the squared value of the effective value of the detected current and the detection cycle in the period corresponding to the first predetermined value, is calculated, and the open / close contact 2 is based on this cumulative current value. The microcomputer 10 has a microcomputer 10 for calculating the remaining time R1 from the detected current until the switching contact 2 is opened, and another electronic circuit breaker. The upper remaining time input circuit 15 connected to the other electronic circuit breaker and inputting the upper remaining time R 2 which is the remaining time R 1 , the remaining time R 1 , the upper remaining time R 2 , and the cumulative current value. Since the trip determination unit 18d for determining whether to open / close the open / close contact 2 based on the LTD is provided, the electronic circuit breaker 102 is a higher-level electronic circuit breaker in the state where the overload state is detected. The cutoff operation can be performed before 200.

２ 開閉接点、３ 電流検出器、４ 整流回路、５ 電源回路、
６ 波形変換回路、７ 引外し回路、８ 引外し装置、
１０ マイクロコンピュータ、
１５ 上位残時間入力回路、１６ 残時間出力回路、
１８ｃ 残時間演算部、１８ｄ トリップ判定部、
１００ 電子式回路遮断器。2 switch contacts, 3 current detectors, 4 rectifier circuits, 5 power supply circuits,
6 waveform conversion circuit, 7 trip circuit, 8 trip device,
10 microcomputer,
15 Upper remaining time input circuit, 16 Remaining time output circuit,
18c remaining time calculation unit, 18d trip determination unit,
100 Electronic circuit breaker.

Claims (6)

電路に挿入される開閉接点と、
前記電路に流れる電流を検出する電流検出器と、
前記電流検出器が検出した検出電流の実効値を所定の演算周期で算出し、前記実効値が定格電流に対応する第１の所定値を超えた期間における前記実効値の２乗値と前記演算周期との積を累積した累積電流値を算出するとともに、前記累積電流値に基づいて前記開閉接点を開離させる制御装置と、を有し、
前記制御装置は、前記検出電流から前記開閉接点を開離させるまでの残時間を算出する残時間演算部と、他の回路遮断器に接続され、前記他の回路遮断器の前記残時間である上位残時間が入力される上位残時間入力回路と、前記残時間、前記上位残時間、および前記累積電流値に基づき前記開閉接点を開離させるかどうかを判定するトリップ判定部と、を備えたことを特徴とする電子式回路遮断器。 The opening / closing contact inserted in the electric circuit and
A current detector that detects the current flowing in the electric circuit, and
The effective value of the detected current detected by the current detector is calculated in a predetermined calculation cycle, and the squared value of the effective value and the calculation in the period when the effective value exceeds the first predetermined value corresponding to the rated current. It has a control device that calculates the cumulative current value by accumulating the product with the period and opens and closes the open / close contact based on the cumulative current value.
The control device is connected to a remaining time calculation unit for calculating the remaining time from the detected current until the opening / closing contact is opened, and another circuit breaker, and is the remaining time of the other circuit breaker. A high-order remaining time input circuit for inputting a high-order remaining time, and a trip determination unit for determining whether to open / close the open / close contact based on the remaining time, the high-level remaining time, and the cumulative current value are provided. An electronic circuit breaker characterized by that. 前記トリップ判定部は、前記検出電流が前記第１の所定値を超えた場合に、前記残時間と前記上位残時間との比較を行い、前記残時間が前記上位残時間より大きい値のとき、前記開閉接点を開離させることを特徴とする請求項１に記載の電子式回路遮断器。 The trip determination unit compares the remaining time with the upper remaining time when the detected current exceeds the first predetermined value, and when the remaining time is larger than the upper remaining time, the trip determination unit performs a comparison. The electronic circuit breaker according to claim 1, wherein the open / close contact is opened and closed. 前記トリップ判定部は、前記検出電流が前記第１の所定値を超えた場合、かつ、前記残時間が第２の所定値以下の場合に、前記残時間と前記上位残時間との比較を行い、前記残時間が前記上位残時間以上の値のとき、前記開閉接点を開離させることを特徴とする請求項１に記載の電子式回路遮断器。 The trip determination unit compares the remaining time with the higher remaining time when the detected current exceeds the first predetermined value and the remaining time is equal to or less than the second predetermined value. The electronic circuit breaker according to claim 1, wherein the open / close contact is opened and closed when the remaining time is equal to or greater than the higher remaining time. 前記残時間演算部で算出した前記残時間を出力する残時間出力回路を備えたことを特徴とする請求項１から請求項３のいずれか１項に記載の電子式回路遮断器。 The electronic circuit breaker according to any one of claims 1 to 3, further comprising a remaining time output circuit that outputs the remaining time calculated by the remaining time calculation unit. 前記残時間と前記上位残時間とを比較し小さい方の値である最小残時間を出力する最小残時間出力回路を備えたことを特徴とする請求項１から請求項３のいずれか１項に記載の電子式回路遮断器。 The item according to any one of claims 1 to 3, further comprising a minimum remaining time output circuit that compares the remaining time with the higher remaining time and outputs the minimum remaining time, which is the smaller value. The electronic circuit breaker described. 電路に挿入される開閉接点と、前記電路に流れる電流を検出する電流検出器と、前記電流検出器が検出した検出電流の実効値を所定の演算周期で算出し、前記実効値が定格電流に対応する第１の所定値を超えた期間における前記実効値の２乗値と前記演算周期との積を累積した累積電流値を算出するとともに、前記累積電流値に基づいて前記開閉接点を開離させる制御装置と、を有し、前記制御装置は、前記検出電流から前記開閉接点を開離させるまでの残時間を算出する残時間演算部と、前記残時間演算部で算出した前記残時間を出力する残時間出力回路と、を有する電子式回路遮断器を上位の電子式回路遮断器として備え、
電路に挿入される開閉接点と、前記電路に流れる電流を検出する電流検出器と、前記電流検出器が検出した検出電流の実効値を所定の演算周期で算出し、前記実効値が定格電流に対応する第１の所定値を超えた期間における前記実効値の２乗値と前記演算周期との積を累積した累積電流値を算出するとともに、前記累積電流値に基づいて前記開閉接点を開離させる制御装置と、を有し、前記制御装置は、前記検出電流から前記開閉接点を開離させるまでの残時間を算出する残時間演算部と、前記上位の電子式回路遮断器に接続され、前記上位の電子式回路遮断器の前記残時間である上位残時間が入力される上位残時間入力回路と、前記残時間、前記上位残時間、および前記累積電流値に基づき前記開閉接点を開離させるかどうかを判定するトリップ判定部と、を有する電子式回路遮断器を下位の電子式回路遮断器として備えたことを特徴とする回路遮断器システム。 The open / close contact inserted into the electric circuit, the current detector that detects the current flowing in the electric circuit, and the effective value of the detected current detected by the current detector are calculated in a predetermined calculation cycle, and the effective value becomes the rated current. The cumulative current value obtained by accumulating the product of the squared value of the effective value and the calculation cycle in the period exceeding the corresponding first predetermined value is calculated, and the open / close contact is opened and closed based on the cumulative current value. The control device has a remaining time calculation unit for calculating the remaining time from the detected current until the opening / closing contact is opened, and the remaining time calculated by the remaining time calculation unit. An electronic circuit breaker with a remaining time output circuit to output is provided as a higher-level electronic circuit breaker.
The open / close contact inserted into the electric circuit, the current detector that detects the current flowing in the electric circuit, and the effective value of the detected current detected by the current detector are calculated in a predetermined calculation cycle, and the effective value becomes the rated current. The cumulative current value obtained by accumulating the product of the squared value of the effective value and the calculation cycle in the period exceeding the corresponding first predetermined value is calculated, and the open / close contact is opened and closed based on the cumulative current value. The control device is connected to a remaining time calculation unit for calculating the remaining time from the detected current until the opening / closing contact is opened, and the upper electronic circuit breaker. The open / close contact is opened and closed from the upper remaining time input circuit in which the upper remaining time, which is the remaining time of the upper electronic circuit breaker, is input, and the open / close contact based on the remaining time, the upper remaining time, and the cumulative current value. A circuit breaker system characterized in that an electronic circuit breaker having a trip determination unit for determining whether or not to cause the current is provided as a lower-level electronic circuit breaker.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009259809A (en) 2008-04-15 2009-11-05 General Electric Co <Ge> Circuit breaker having separation-type restrained and unrestrained zone selective interlock setting function
JP2010093946A (en) 2008-10-08 2010-04-22 Mitsubishi Electric Corp Electronic circuit breaker

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1189620A (en) * 1997-01-28 1998-08-05 尹顿公司 Apparatus and method for measuring AC current which saturates core of current transformer using values of secondary current up to saturation
JP3668652B2 (en) * 1999-10-22 2005-07-06 三菱電機株式会社 Electronic circuit breaker
US6906502B2 (en) * 2002-11-14 2005-06-14 Fyre Storm, Inc. Method for regulating an output voltage of a power coverter
CN100446375C (en) * 2004-12-10 2008-12-24 哈尔滨工业大学 AC motor thermal overload protection method
JP5579046B2 (en) * 2010-12-27 2014-08-27 株式会社マキタ Electric tool equipment
TWI423550B (en) * 2011-08-31 2014-01-11 Univ Ishou Intelligent circuit breaker integrated management system, equipment and intelligent distribution box
CN202940578U (en) * 2012-12-12 2013-05-15 国电南瑞科技股份有限公司 Current detection circuit for breaker trip
TWI563759B (en) * 2015-08-13 2016-12-21 Nat Univ Chin Yi Technology Fully electronic exchange overcurrent breaker
TW201733246A (en) * 2016-03-14 2017-09-16 Chang Shuan Electronics Co Ltd Electrical usage safety detector overcoming the defect that a traditional circuit breaker has limited function
CN207459694U (en) * 2017-11-21 2018-06-05 江苏创能电器有限公司 A kind of breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009259809A (en) 2008-04-15 2009-11-05 General Electric Co <Ge> Circuit breaker having separation-type restrained and unrestrained zone selective interlock setting function
JP2010093946A (en) 2008-10-08 2010-04-22 Mitsubishi Electric Corp Electronic circuit breaker

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JPWO2020161890A1 (en) 2021-09-30
WO2020161890A1 (en) 2020-08-13

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