JP2005158304A - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
JP2005158304A
JP2005158304A JP2003391217A JP2003391217A JP2005158304A JP 2005158304 A JP2005158304 A JP 2005158304A JP 2003391217 A JP2003391217 A JP 2003391217A JP 2003391217 A JP2003391217 A JP 2003391217A JP 2005158304 A JP2005158304 A JP 2005158304A
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circuit breaker
current
load
load factor
circuit
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JP2005158304A5 (en
Inventor
Toshimitsu Nomura
敏光 野村
Takashi Kurosaki
剛史 黒崎
Koichi Nishimura
貢一 西村
Kota Kashimoto
耕太 柏本
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP2003391217A priority Critical patent/JP2005158304A/en
Priority to CNB2004100434651A priority patent/CN100418280C/en
Publication of JP2005158304A publication Critical patent/JP2005158304A/en
Publication of JP2005158304A5 publication Critical patent/JP2005158304A5/ja
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker in which a user can recognize wether or not having any margin in the load current value of the electric circuit for automatic circuit interception of the circuit breaker and against a prescribed level. <P>SOLUTION: Load factor is calculated with load rate calculation means 116 from a rated current value of the circuit breaker 101 set by load current value of an electric circuit operated via a converter 5 by electric current effective value computation means 112 and rated electric current setting means 115. This load factor is made to be displayed at the monochrome liquid crystal display element 13, and lighting or blinking of the light emitting diode set beforehand corresponding to its magnitude makes the monochrome liquid crystal display element 13 illuminate and this is provided as a backlight illumination of the monochrome liquid crystal display element 13, whereby visibility of the load factor is obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、配線用遮断器や漏電遮断器などの回路遮断器に関し、詳しくは電路の負荷電流などの電路情報を表示する機能を持たせた表示装置を有する回路遮断器に関する。   The present invention relates to a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, and more particularly to a circuit breaker having a display device having a function of displaying electric circuit information such as a load current of an electric circuit.

過電流や短絡、あるいは漏電事故に対し、当該電路を自動遮断する配線用遮断器、あるいは漏電遮断器には、こういった遮断動作に至る前の兆候（情報）を事前に捉え、場合によってはこの情報を使用者側が有意義に活かすことで、当該電路の無瞬断化を担う機器としての役目も求められている。こういった市場の声に応えるため、従来の回路遮断器においては、当該電路の漏電電流が所定の値を越えたとき、あるいは当該電路の負荷電流が回路遮断器の自動遮断に至らぬ所定レベルを越えたとき、これらの状態を使用者側に知らしめるために、回路遮断器に具備された発光ダイオードを点灯させる構成にしている（例えば、特許文献１参照）。   In the case of an overcurrent, short circuit, or leakage accident, the circuit breaker for wiring that automatically shuts off the circuit, or the leakage breaker, captures the signs (information) before reaching such a breaking action in advance. By utilizing this information meaningfully on the user side, a role as a device responsible for uninterruptible electric circuit is also required. In order to respond to the voice of such a market, in the conventional circuit breaker, when the leakage current of the circuit exceeds a predetermined value, or the load current of the circuit does not reach the automatic circuit breaker at a predetermined level In order to notify the user of these states when exceeding the above, the light-emitting diode provided in the circuit breaker is turned on (for example, see Patent Document 1).

特開２００１−１２８３５３号公報（段落番号０００９〜００１１、図１）JP 2001-128353 A (paragraph numbers 0009 to 0011, FIG. 1)

従来の回路遮断器では、発光ダイオードが点灯したことで、予め決められた所定レベルを越えたことは目視により認識できるが、発光ダイオードが点灯後は、当該電路の負荷電流値が回路遮断器の自動遮断に対する裕度の有無が、また発光ダイオードの点灯前では、当該電路の負荷電流値が所定レベルに対する裕度の有無が、それぞれ認識できないという欠点があった。   In the conventional circuit breaker, it can be visually recognized that the light emitting diode has been turned on, and thus the predetermined level that has been determined in advance is visually recognized. However, after the light emitting diode is turned on, the load current value of the circuit is There is a drawback in that it is impossible to recognize whether there is tolerance for automatic shut-off, and whether the load current value of the electric circuit has tolerance for a predetermined level before the light emitting diode is turned on.

この発明は、上述のような課題を解決するためになされたもので、当該電路の負荷電流値が、回路遮断器の自動遮断および所定レベルに対する裕度の有無を、使用者（観察者）が容易に認識できる回路遮断器を得ることを目的とするものである。   The present invention has been made to solve the above-described problems, and the load current value of the electric circuit is determined by the user (observer) as to whether the circuit breaker automatically shuts down and has a tolerance for a predetermined level. The object is to obtain a circuit breaker that can be easily recognized.

この発明に係る回路遮断器においては、当該電路の負荷電流値を回路遮断器の定格電流に対する割合に換算した値として、回路遮断器に具備された表示ユニットに表示するよう構成されたものである。   In the circuit breaker according to the present invention, the load current value of the electric circuit is displayed on a display unit provided in the circuit breaker as a value converted to a ratio to the rated current of the circuit breaker. .

この発明は以上説明したように、電路に流れる負荷電流を検出、およびアナログ／ディジタル変換してディジタル信号にする電流検出変換手段と、上記電流検出変換手段により検出・変換された電流値から電流実効値を演算する電流実効値演算手段と、該回路遮断器の定格電流に対応し、上記負荷電流の大きさに応じた複数の動作時限特性を記憶保持する時限回路と、上記負荷電流が上記動作時限特性のいずれかの動作レベルにある状態が所定の時間継続したとき、該回路遮断器を遮断動作させる信号を出力する遮断動作出力手段とを備えた回路遮断器において、該回路遮断器の定格電流に対する、上記電流実効値演算手段により演算された電流実効値の割合を示した負荷率を計算する負荷率計算手段と、かつ上記負荷率を表示する表示手段とを備えたので、上記負荷電流の該回路遮断器の自動遮断および所定レベルに対する裕度の有無を、使用者（観察者）は容易に認識することができる。   As described above, according to the present invention, the load current flowing in the electric circuit is detected and converted into a digital signal by analog / digital conversion, and the current effective from the current value detected and converted by the current detection conversion unit. Current effective value calculating means for calculating a value, a time limit circuit corresponding to the rated current of the circuit breaker and storing a plurality of operation time characteristic according to the magnitude of the load current, and the load current operating the A circuit breaker comprising a breaking operation output means for outputting a signal for breaking the circuit breaker when a state at any one of the operation characteristics of the timed characteristics continues for a predetermined time. A load factor calculating means for calculating a load factor indicating a ratio of an effective current value calculated by the effective current value calculating means to a current; and a display means for displaying the load factor. Because with a, whether the margin for the automatic shut-off and a predetermined level of the circuit breaker of the load current, the user (viewer) can be easily recognized.

実施の形態１．
図１はこの発明の実施の形態１における回路遮断器のブロック回路図を示すものである。図１において、図示しない変圧器などの電源に接続されている電路１、および同じく図示しないモーターなどの負荷に接続されている電路２は、それぞれ絶縁性の筐体を有する回路遮断器１０１に具備された電源側端子３および負荷側端子４に接続されている。この電源から負荷へ、つまり電路１から電路２へ流れる電流（以下、負荷電流と称す）は、常時、回路遮断器１０１に内蔵された変流器５を介して電流検出変換手段１１１に入力されている。この電流検出変換手段１１１において、負荷電流は、電流検出回路６で電流検出信号、さらにはＡ／Ｄ（Ａｎａｌｏｇ／Ｄｉｇｉｔａｌ）変換回路７でディジタル信号と、その形態を変え、このディジタル信号が電流実効値演算手段１１２に取り込まれ、この電流実効値演算手段１１２にて演算されることで、回路遮断器１０１は負荷電流の値を認識することができる。 Embodiment 1 FIG.
1 is a block circuit diagram of a circuit breaker according to Embodiment 1 of the present invention. In FIG. 1, an electric circuit 1 connected to a power source such as a transformer (not shown) and an electric circuit 2 connected to a load such as a motor (not shown) are provided in a circuit breaker 101 having an insulating casing. The power supply side terminal 3 and the load side terminal 4 are connected. The current flowing from the power source to the load, that is, from the electric circuit 1 to the electric circuit 2 (hereinafter referred to as load current) is always input to the current detection conversion unit 111 via the current transformer 5 built in the circuit breaker 101. ing. In this current detection conversion means 111, the load current is changed in form from a current detection signal in the current detection circuit 6 to a digital signal in the A / D (Analog / Digital) conversion circuit 7. The circuit breaker 101 can recognize the value of the load current by being taken into the value calculating means 112 and being calculated by the current effective value calculating means 112.

演算された負荷電流の値が回路遮断器１０１の定格電流を越えた場合、その大きさに応じて、時限回路１１３内に具備された、長限時９、短限時１０、および瞬時１１の各動作時限特性のいずれかに送られ、この状態が所定の時間継続すれば、時限回路１１３は遮断動作出力手段１１４に対し遮断指令を与える。詳しくは、例えば、回路遮断器１０１の定格電流が１６００Ａのとき、負荷電流が定格電流に対し、
ａ．２倍（よって、３２００Ａ）では長限時９が１５０秒後に、
ｂ．４倍×１．５倍（よって、９６００Ａ）では短限時１０が０．５秒後に、
ｃ．１６倍（よって、２５６００Ａ）では瞬時１１が０．０５秒後に、
それぞれ遮断動作出力手段１１４に対し遮断指令を送り、この遮断動作出力手段１１４は直ちに開閉機構部８をトリップ動作させ、負荷電流を断つことで、電路１、あるいは電路２で使用される電線などの焼損を未然に防いでいる。また、定格電流設定手段１１５によって定格電流が変更になったときは、その情報が時限回路１１３にも送られ、前述の各動作時限特性も連動して変更される（例えば、定格電流を１４４０Ａに変更した場合、短限時特性の電流値は８６４０Ａとなる）。なお、この定格電流設定手段１１５は、例えば、図示しない回路遮断器１０１に具備された操作ハンドルの近傍などに、いわゆる使用者が操作し易いよう、前述した絶縁性の筐体の表面に設けられている場合が多い。 When the calculated load current value exceeds the rated current of the circuit breaker 101, each operation of the long time period 9, the short time period 10, and the instantaneous time 11 provided in the time circuit 113 according to the magnitude thereof. If it is sent to one of the time characteristics and this state continues for a predetermined time, the time circuit 113 gives a shut-off command to the shut-off operation output means 114. Specifically, for example, when the rated current of the circuit breaker 101 is 1600 A, the load current is relative to the rated current.
a. At twice (and hence 3200A), the long time 9 is 150 seconds later,
b. At 4x1.5x (thus 9600A), the short time 10 is 0.5 seconds later,
c. At 16 times (hence 25600A), instantaneous 11 is 0.05 seconds later,
A shut-off command is sent to the shut-off operation output means 114, and the shut-off operation output means 114 immediately trips the opening / closing mechanism section 8 to cut off the load current, so that the electric wire used in the electric circuit 1 or the electric circuit 2 is Prevents burning. When the rated current is changed by the rated current setting means 115, the information is also sent to the time limit circuit 113, and the above-mentioned operation time characteristics are also changed in conjunction with each other (for example, the rated current is changed to 1440A). If changed, the current value of the short time characteristic is 8640A). The rated current setting means 115 is provided on the surface of the above-described insulating casing so that a so-called user can easily operate, for example, in the vicinity of an operation handle provided in the circuit breaker 101 (not shown). There are many cases.

演算された負荷電流の値と定格電流設定手段１１５によって設定された回路遮断器１０１の定格電流の情報は負荷率計算手段１１６にも送られ、ここで定格電流に対する負荷電流の割合（以下、負荷率と称す）が計算される。例えば、定格電流１６００Ａに対し、負荷電流が１１２０Ａならば、負荷率は７０％となる。この負荷率は液晶ドライバ回路１２を介してモノクロ液晶表示素子１３に表示されるとともに、後述するＬＥＤドライバ回路１４にも送られる。   Information on the calculated load current value and the rated current of the circuit breaker 101 set by the rated current setting means 115 is also sent to the load factor calculating means 116, where the ratio of the load current to the rated current (hereinafter referred to as the load current). Called rate). For example, if the load current is 1120 A with respect to the rated current of 1600 A, the load factor is 70%. This load factor is displayed on the monochrome liquid crystal display element 13 via the liquid crystal driver circuit 12 and also sent to the LED driver circuit 14 described later.

図２は負荷電流に応じた、モノクロ液晶表示素子１３の状態変化の一例を表した図である。図２において、紙面上太線の軌跡は負荷率の時間推移を表しており、任意の時刻Ｔ１〜Ｔ７における負荷率がモノクロ液晶表示素子１３に表示されている（例えば、時刻Ｔ４においては、モノクロ液晶表示素子１３は７５％を表示している）。モノクロ液晶表示素子１３の下部には発光色を異とする発光ダイオード（以下、ＬＥＤ（ｌｉｇｈｔ ｅｍｉｔｔｉｎｇ ｄｉｏｄｅ）と略す）１５〜１８が具備されており、負荷率の情報がＬＥＤドライバ回路１４（図１参照）に送られることで、このＬＥＤドライバ回路１４は、その負荷率の大きさに応じてＬＥＤ１５〜１８のうち、いずれか少なくとも一つをモノクロ液晶表示素子のバックライト光源として点灯させる。ここで、例えば、ＬＥＤ１５を青色、ＬＥＤ１６を緑色、ＬＥＤ１７を黄色、およびＬＥＤ１８を赤色とし、さらに負荷率が、８０％未満では青色を、８０％以上９０％未満では緑色を、９０％以上１００％未満では黄色を、１００％以上では赤色を、それぞれ点灯するように予め設定しておけば、時刻Ｔ１、Ｔ２およびＴ４では青色が、時刻Ｔ３およびＴ５では緑色が、時刻Ｔ６では黄色が、時刻Ｔ７では赤色が、それぞれ図示しない導光板を通じてモノクロ液晶表示素子１３のバックライト照明に供される。なお、図２では、バックライト照明色の違いを、作図の便宜上、ハッチングの違いで表している。   FIG. 2 is a diagram showing an example of a state change of the monochrome liquid crystal display element 13 according to the load current. In FIG. 2, the locus of the thick line on the paper represents the time transition of the load factor, and the load factor at any time T1 to T7 is displayed on the monochrome liquid crystal display element 13 (for example, at time T4, the monochrome liquid crystal is displayed). The display element 13 displays 75%). Below the monochrome liquid crystal display element 13, light emitting diodes (hereinafter abbreviated as “light emitting diodes”) 15 to 18 having different emission colors are provided, and load factor information is transmitted to the LED driver circuit 14 (FIG. 1). The LED driver circuit 14 turns on at least one of the LEDs 15 to 18 as a backlight light source of the monochrome liquid crystal display element according to the magnitude of the load factor. Here, for example, the LED 15 is blue, the LED 16 is green, the LED 17 is yellow, and the LED 18 is red. Further, when the load factor is less than 80%, blue is displayed, and when the load factor is 80% or more and less than 90%, green is 90% or more and 100%. If it is set in advance to light up yellow at less than 100% and red at 100% or more, blue at time T1, T2 and T4, green at time T3 and T5, yellow at time T6, and time T7 Then, red is used for backlight illumination of the monochrome liquid crystal display element 13 through a light guide plate (not shown). In FIG. 2, the difference in backlight illumination color is represented by the difference in hatching for convenience of drawing.

したがって、負荷電流を定格電流に対する負荷率として表示しているので、回路遮断器１０１の自動遮断レベル、あるいは任意に設定された所定レベルに対する裕度の有無、すなわち負荷の使用状況が一目で認識できるとともに、負荷率の大小に応じてモノクロ液晶表示素子１３のバックライト色を変更させているので視野角にあまり左右されることなく、いわゆるレベルメーターとして機能させることができる。なお、モノクロ液晶表示素子１３とＬＥＤ１５〜１８で構成される表示ユニット１１７は、図１において、定格電流設定手段１１５と同様、回路遮断器１０１の表面に設置されているように記載しているが、回路遮断器１０１が、例えば配電盤の高い位置や奥まった箇所に取り付けられることを考慮し、この表示ユニット１１７は分離可能とし、任意の場所に自在に設置できるようにしておけば、さらに視認性は向上する。   Therefore, since the load current is displayed as a load ratio with respect to the rated current, it is possible to recognize at a glance whether the circuit breaker 101 has an automatic shut-off level, or whether or not there is a margin with respect to an arbitrarily set predetermined level, that is, the load usage status. At the same time, since the backlight color of the monochrome liquid crystal display element 13 is changed according to the load factor, it can function as a so-called level meter without much influence on the viewing angle. Although the display unit 117 composed of the monochrome liquid crystal display element 13 and the LEDs 15 to 18 is illustrated in FIG. 1 as being installed on the surface of the circuit breaker 101 as with the rated current setting means 115. Considering that the circuit breaker 101 is attached to a high position or a recessed place on the switchboard, for example, the display unit 117 is separable, and if it can be freely installed at any place, the visibility is further improved. Will improve.

視認性を高めるという点で考えれば、単にカラー液晶表示素子を使用しても同様の効果は得られるが、回路遮断器として求められるスペック、すなわち経済性、寿命、使用環境などを鑑み、本発明のようにモノクロ液晶表示素子およびバックライト光源用ＬＥＤの組み合わせで構成することが好ましい。以上、これまでの説明では、負荷率に限定していたが、図１において、電流実効値演算手段１１２によって演算された負荷電流の値を液晶ドライバ回路１２に送ることで、負荷電流値を同時に表示してもよく、また、これら負荷電流に関する情報以外、例えば漏洩電流であっても同様の効果が得られることは言うまでもない。   In view of improving visibility, the same effect can be obtained by simply using a color liquid crystal display element, but in view of specifications required as a circuit breaker, that is, economy, life, use environment, etc., the present invention. As described above, it is preferable to use a combination of a monochrome liquid crystal display element and a backlight light source LED. In the above description, the load factor is limited. However, in FIG. 1, the load current value calculated by the current effective value calculation unit 112 is sent to the liquid crystal driver circuit 12 in FIG. Needless to say, the same effect can be obtained even if the current is other than the information on the load current, for example, leakage current.

実施の形態２．
実施の形態１では、バックライト照明色の切換ポイントは予め決められていたが、図３に示すように、バックライト制御手段１１８を設けることで、使用者側がバックライト照明色の切換ポイントを任意に設定できるとともに、このバックライト照明色の点灯順番も変えることができる。この設定方法を図４に基づき説明する。図４において、表示ユニット１１７ａには、モノクロ液晶表示素子１３の紙面上、下側に押しボタンなどで構成されるバックライト制御手段１１８が備わっている。使用者は回路遮断器１０１への通電開始にあたり、負荷率の切換ポイントおよびバックライト照明色を決定する。例えば、
１．７０％以上１０５％未満では、緑色の点灯、
２．１０５％以上１１５％未満では、青色の点灯、
３．１１５％以上１３０％未満では、黄色の点灯、
４．１３０％以上では、赤色の点滅
としたい場合には、上記番号１．２．・・・に、下記番号１−１．１−２．・・・を呼応させる形として、
１−１．７→０→緑→点灯→設定、
２−１．１→０→５→青→点灯→設定、
３−１．１→１→５→黄→点灯→設定、
４−１．１→３→０→赤→点滅→設定
と設定する。 Embodiment 2. FIG.
In the first embodiment, the backlight illumination color switching point is determined in advance. However, as shown in FIG. 3, by providing the backlight control means 118, the user can arbitrarily set the backlight illumination color switching point. And the lighting order of the backlight illumination color can be changed. This setting method will be described with reference to FIG. In FIG. 4, the display unit 117 a includes a backlight control unit 118 configured with push buttons or the like on the lower side of the monochrome liquid crystal display element 13. When the user starts energizing the circuit breaker 101, the user determines the load factor switching point and the backlight illumination color. For example,
1. 70% or more and less than 105%, green lighting,
2. If it is 105% or more and less than 115%, it lights blue.
3. If it is 115% or more and less than 130%, it is lit yellow.
4. At 130% or more, when it is desired to blink red, the above number 1.2. ... and the following number 1-1.1-2. As a form to respond ...
1-1.7 → 0 → Green → Lit → Setting,
2-1.1 → 0 → 5 → Blue → Lit → Setting
3-1.1 → 1 → 5 → yellow → lit → setting,
4-1.1 → 3 → 0 → Red → Flashing → Set.

このように構成および設定された回路遮断器１０１における、負荷電流に応じたモノクロ液晶表示素子１３の状態変化の一例を図５に基づいて説明する。図５において、紙面上太線の軌跡は負荷率の時間推移を表しており、任意の時刻Ｔ１〜Ｔ４における、定格電流１６００Ａでの負荷率および負荷電流値がモノクロ液晶表示素子１３に表示されている（例えば、時刻Ｔ２においては、モノクロ液晶表示素子１３は１１０％および１７６０Ａを表示している）。前述した設定に基づき、時刻Ｔ１では緑色が、時刻Ｔ２では青色が、および時刻Ｔ３では黄色が、それぞれモノクロ液晶表示素子１３のバックライト照明として点灯し、さらに時刻Ｔ４では赤色が点滅、いわゆるフリッカ表示することで、回路遮断器１０１の自動遮断が近づいていることをより強調させることができる（実施の形態１と同様、バックライト照明色の違いを、作図の便宜上、ハッチングの違いで表している）。したがって、使用者側がきめ細かい管理を必要としたい負荷率の領域を自由に設定することができるので、負荷の稼動状況や通常の電力使用状況などにフレキシブルに対応した負荷率の状態変化を、使用者に認識させることができる。   An example of a state change of the monochrome liquid crystal display element 13 according to the load current in the circuit breaker 101 configured and set in this way will be described with reference to FIG. In FIG. 5, the locus of the thick line on the paper represents the time transition of the load factor, and the load factor and the load current value at the rated current of 1600 A at any time T1 to T4 are displayed on the monochrome liquid crystal display element 13. (For example, at the time T2, the monochrome liquid crystal display element 13 displays 110% and 1760A). Based on the above-described setting, green at time T1, blue at time T2, and yellow at time T3 are lit as backlight illumination of the monochrome liquid crystal display element 13, and red at time T4 flashes, so-called flicker display. By doing so, it can be emphasized that the automatic circuit breaker 101 is approaching automatic shutoff (similar to the first embodiment, the difference in backlight illumination color is represented by the difference in hatching for the convenience of drawing. ). Therefore, it is possible to freely set the load factor area that the user wants to require fine-tuned management, so the load factor state changes that flexibly correspond to the operating status of the load and the normal power usage status, etc. Can be recognized.

この発明の実施の形態１における回路遮断器のブロック回路図である。It is a block circuit diagram of the circuit breaker in Embodiment 1 of this invention. この発明の実施の形態１における負荷電流に応じたモノクロ液晶表示素子の状態変化の一例を表した図である。It is a figure showing an example of the state change of the monochrome liquid crystal display element according to the load current in Embodiment 1 of this invention. この発明の実施の形態２における回路遮断器のブロック回路図である。It is a block circuit diagram of the circuit breaker in Embodiment 2 of this invention. この発明の実施の形態２における表示ユニットの正面図である。It is a front view of the display unit in Embodiment 2 of this invention. この発明の実施の形態２における負荷電流に応じたモノクロ液晶表示素子の状態変化の一例を表した図である。It is a figure showing an example of the state change of the monochrome liquid crystal display element according to the load current in Embodiment 2 of this invention.

符号の説明Explanation of symbols

６ 電流検出回路、７ Ａ／Ｄ変換回路、１２ 液晶ドライバ回路、
１３ モノクロ液晶表示素子、１４ ＬＥＤドライバ回路、
１５〜１８ ＬＥＤ、
１０１ 回路遮断器、１１１ 電流検出変換手段、
１１２ 電流実効値演算手段、１１５ 定格電流設定手段、
１１６ 負荷率計算手段、１１７・１１７ａ 表示ユニット、
１１８ バックライト。
6 current detection circuit, 7 A / D conversion circuit, 12 liquid crystal driver circuit,
13 monochrome liquid crystal display element, 14 LED driver circuit,
15-18 LED,
101 circuit breaker, 111 current detection conversion means,
112 current effective value calculation means, 115 rated current setting means,
116 Load factor calculation means, 117 / 117a display unit,
118 Backlight.

Claims (6)

電路に流れる負荷電流を検出、およびアナログ／ディジタル変換してディジタル信号にする電流検出変換手段と、上記電流検出変換手段により検出・変換された電流値から電流実効値を演算する電流実効値演算手段と、該回路遮断器の定格電流に対応し、上記負荷電流の大きさに応じた複数の動作時限特性を記憶保持する時限回路と、上記負荷電流が上記動作時限特性のいずれかの動作レベルにある状態が所定の時間継続したとき、該回路遮断器を遮断動作させる信号を出力する遮断動作出力手段とを備えた回路遮断器において、
該回路遮断器の定格電流に対する、上記電流実効値演算手段により演算された電流実効値の割合を示した負荷率を計算する負荷率計算手段と、かつ上記負荷率を表示する表示手段とを備えたことを特徴とする回路遮断器。 Current detection conversion means for detecting the load current flowing in the electric circuit and converting the analog / digital conversion into a digital signal, and current effective value calculation means for calculating the current effective value from the current value detected and converted by the current detection conversion means A timing circuit corresponding to the rated current of the circuit breaker and storing and holding a plurality of operating time characteristics according to the magnitude of the load current, and the load current at any operating level of the operating time characteristics In a circuit breaker comprising a breaking operation output means for outputting a signal for breaking the circuit breaker when a certain state continues for a predetermined time,
A load factor calculating means for calculating a load factor indicating a ratio of an effective current value calculated by the effective current value calculating means to a rated current of the circuit breaker; and a display means for displaying the load factor. A circuit breaker characterized by that. 表示手段が液晶素子であり、かつ上記液晶素子を後方から照射させるバックライト光源と、負荷率の状態に応じて上記バックライト光源の発光を変化させるバックライト制御手段とを備えたことを特徴とする請求項１に記載の回路遮断器。 The display means is a liquid crystal element, and includes a backlight light source that irradiates the liquid crystal element from behind, and a backlight control means that changes light emission of the backlight light source according to a load factor state. The circuit breaker according to claim 1. バックライト光源は、発光色を異とする複数の発光ダイオードで構成されたことを特徴とする請求項２に記載の回路遮断器。 The circuit breaker according to claim 2, wherein the backlight light source is composed of a plurality of light emitting diodes having different emission colors. バックライト制御手段は、発光ダイオードの発光の変化する基準を、負荷率に対して設定できるように構成されたことを特徴とする請求項２に記載の回路遮断器。 The circuit breaker according to claim 2, wherein the backlight control means is configured to set a reference for changing light emission of the light emitting diode with respect to the load factor. 該回路遮断器の定格電流を設定する定格電流設定手段を備えたことを特徴とする請求項１に記載の回路遮断器。 2. The circuit breaker according to claim 1, further comprising rated current setting means for setting a rated current of the circuit breaker. 電流実効値演算手段により演算された電流実効値を、負荷率とともに液晶素子へ表示させるように構成したことを特徴とする請求項１に記載の回路遮断器。
2. The circuit breaker according to claim 1, wherein the current effective value calculated by the current effective value calculating means is displayed on the liquid crystal element together with the load factor.
JP2003391217A 2003-11-20 2003-11-20 Circuit breaker Pending JP2005158304A (en)

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JP2008136279A (en) * 2006-11-27 2008-06-12 Matsushita Electric Works Ltd Distribution board
KR100970892B1 (en) 2008-09-17 2010-07-16 권순락 ELB trip alarm system for piping heating device
EP2993781A4 (en) * 2013-04-30 2016-12-14 Fuji Electric Co Ltd Control device and drive device for motor

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