JPH04200229A - Earth detector - Google Patents
Earth detectorInfo
- Publication number
- JPH04200229A JPH04200229A JP33544590A JP33544590A JPH04200229A JP H04200229 A JPH04200229 A JP H04200229A JP 33544590 A JP33544590 A JP 33544590A JP 33544590 A JP33544590 A JP 33544590A JP H04200229 A JPH04200229 A JP H04200229A
- Authority
- JP
- Japan
- Prior art keywords
- discriminator
- output
- side signal
- circuit
- positive side
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 abstract description 20
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000004804 winding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 241000277269 Oncorhynchus masou Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、交流電路に地絡が発生した時その交流電路
を遮断する地絡検出装置、特に例えば電動機等の起動時
における突入電流による平衡特性に対して不要動作しに
くい地絡検出装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a ground fault detection device that interrupts an AC line when a ground fault occurs in the line, and in particular, a ground fault detection device that interrupts an AC line when a ground fault occurs in the line. This invention relates to a ground fault detection device that is unlikely to operate unnecessarily due to its characteristics.
［従来の技術］
第５図は従来の地絡検出装置を示す構成図である。図に
おいて、（１）は交流電路、（２）は交流電路（１）に
設けられ、電動機などの突入電流を発する負荷機器、（
３）は交流電路（１〉に設置された遮断器、（４〉は交
流電路（１）を−次巻線とする零相変流器、（５）は遮
断器（３）に連結された電磁装置、（６）は電磁装置り
５）に直列に接続されたスイッチング素子、（ア）は零
相変流器（４）の出力を入力ととするレベル判別器、（
８）はレベル判別器（７）の出力の時間幅を判別する信
号幅判別器、（９）は信号幅判別器（８）からの出力を
入力とするラッチ回路、（１０）は信号幅判別器（８）
の入力側に設けられた時間幅設定用コンデンサである。[Prior Art] FIG. 5 is a configuration diagram showing a conventional ground fault detection device. In the figure, (1) is an AC line, (2) is a load device that is installed in the AC line (1) and generates an inrush current, such as a motor, (
3) is a circuit breaker installed in the AC line (1), (4) is a zero-phase current transformer with the AC line (1) as the -order winding, and (5) is connected to the circuit breaker (3). An electromagnetic device, (6) is a switching element connected in series with the electromagnetic device (5), (A) is a level discriminator whose input is the output of the zero-phase current transformer (4), (
8) is a signal width discriminator that discriminates the time width of the output of the level discriminator (7), (9) is a latch circuit that receives the output from the signal width discriminator (8), and (10) is a signal width discriminator. Vessel (8)
This is a time width setting capacitor provided on the input side of the .
次に第６図に示すタイミングチャートに従って従来の地
絡検出装置の一般の地路検出動作について説明する。図
において、第６図（ａ）は交流電路（１）の地絡成分信
号、第６図（ｂ）は零相変流器（４）の出力を示す。こ
の零相変流器（４）の出力がレベル判別器（７）の判別
器レベル（ＴＨＩ）を第６図（ｂ）に示すように超える
と、レベル判別器（７）内の定電流源圧力回路（図示せ
ず）が動作して、第６図（ｃ）に示すような出力を発生
し、これによりコンデンサ（１０）を充電する。よって
コンデンサ（１０）の端子電圧は第６図（ｄ）に示すよ
うに上昇する。すると、所定の時間（Ｔｄ）７１コンデ
ンサ（１０）の端子電圧は信号幅判別器（８）の判定レ
ベル（ＴＩ２）に達し、信号幅判別器（８）が第６図（
ｅ）に示すような出力を発生し、ラッチ回路（９）が動
作する。Next, the general ground fault detection operation of the conventional ground fault detection device will be explained according to the timing chart shown in FIG. In the figures, FIG. 6(a) shows the ground fault component signal of the AC line (1), and FIG. 6(b) shows the output of the zero-phase current transformer (4). When the output of this zero-phase current transformer (4) exceeds the discriminator level (THI) of the level discriminator (7) as shown in Figure 6(b), the constant current source in the level discriminator (7) A pressure circuit (not shown) operates to produce an output as shown in FIG. 6(c), thereby charging the capacitor (10). Therefore, the terminal voltage of the capacitor (10) increases as shown in FIG. 6(d). Then, for a predetermined time (Td), the terminal voltage of the capacitor (10) 71 reaches the determination level (TI2) of the signal width discriminator (8), and the signal width discriminator (8)
An output as shown in e) is generated, and the latch circuit (9) operates.
この結果、ラッチ回路（９）の第６図（ｈ）に示すよう
な出力にてサイリスト等のスイッチング素子（６）を作
動させて電磁装置（５）を介し遮断器（３）を引き外し
て、交流電路（１）を遮断することかできる。 □
零相変流器（６）の第６図（ｂ）に示す出力がレベル判
別器（７）の判定レベル（ＴＩ（１）を超える時間が所
定の時間（Ｔｄ）より短い場合はコンデンサ（１０）の
端子電圧は信号幅判別器（８）の判定レベル（ＴＩ２）
に達しないので、ラッチ回路（９）が動作せず、交流電
路（１）を遮断することはない。また、零相検出器（６
）の出力がレベル判別器（７）の判定レベル（Ｔ）１１
）に到らない場合にはコンデンサ（１０）への充電がな
く交流電路（１）を遮断することはない。As a result, the output of the latch circuit (9) as shown in Figure 6 (h) activates the switching element (6) such as a thyrist and trips the circuit breaker (3) via the electromagnetic device (5). The AC line (1) can be cut off. □ If the time during which the output of the zero-phase current transformer (6) shown in Figure 6(b) exceeds the judgment level (TI(1)) of the level discriminator (7) is shorter than the predetermined time (Td), the capacitor ( 10) terminal voltage is the judgment level (TI2) of the signal width discriminator (8)
Therefore, the latch circuit (9) does not operate and the AC line (1) is not cut off. In addition, a zero-phase detector (6
) output is the judgment level (T) 11 of the level discriminator (7)
), the capacitor (10) is not charged and the AC line (1) is not interrupted.
次に第７図に示すタイミングチャートに従って電動機な
どの起動時における突入電流による従来の地絡検出装置
の不要動作について説明する。Next, an unnecessary operation of the conventional ground fault detection device due to an inrush current at the time of starting a motor or the like will be explained according to the timing chart shown in FIG.
零相変流器（４）は、論理的には一次巻線を流れる電流
が平衡であれば鉄心内の磁束が相殺され二次出力を生じ
ない。しかし、実際には一次巻線の配置による磁気特性
のアンバランスがあり、これを打ち消すための電流が二
次巻線に発生し、僅かの二次出力が生じており、これを
−射的に平衡特性と言っている。通常のこの僅かの二次
出力ではレベル判別器（７）の判定レベル（ＴＨＩ）に
到らないので交流電路（１）を遮断することはない。し
かし電動機などの負荷機器＜２）の起動時における突入
電流は短い時間（数Ｈｚ）であるが通常電流値の数倍に
達することがあり、この場合の零相変流器（４）の出力
が例えば第７図（ｂ）に示すようにレベル判別器（７）
の判定レベル（Ｔ）ＩＩ）を超え、レベル判別器（７）
が動作して第７図（ｃ）に示すような出力を発生し、こ
れによりコンデンサ（１０）を充電する。Logically, if the current flowing through the primary winding is balanced, the zero-phase current transformer (4) will cancel out the magnetic flux in the iron core and will not produce a secondary output. However, in reality, there is an unbalance in magnetic properties due to the arrangement of the primary winding, and a current is generated in the secondary winding to cancel this out, resulting in a slight secondary output. This is called an equilibrium property. Since this small amount of normal secondary output does not reach the judgment level (THI) of the level discriminator (7), the AC line (1) is not cut off. However, the inrush current at the time of starting a load device such as an electric motor (<2) may reach several times the normal current value, although it is for a short time (several Hz).In this case, the output of the zero-phase current transformer (4) For example, as shown in FIG. 7(b), the level discriminator (7)
exceeds the judgment level (T) II), and the level discriminator (7)
operates to generate an output as shown in FIG. 7(c), thereby charging the capacitor (10).
よってコンデンサク１０）の端子電圧は第７図（ｄ）に
示すように上昇する。すると、所定の時間（Ｔｄ）後コ
ンデンサ（１０）の端子電圧は信号幅判別器（８）の判
定レベル（Ｔｌ（２）に達し、信号幅判別器（８）が第
７図（ｅ）に示すような出力を発生し、ラッチ回路（９
）が動作する。この結果ラッチ回路（９）の第７図（ｈ
）に示すような出力にてスイッチング素子（６）を作動
させて電磁装置（５）を介し遮断器（３）を引き外して
、交流電路（１）を遮断する。つまりこの場合地絡検出
装置が不要動作することになる。Therefore, the terminal voltage of the capacitor 10) increases as shown in FIG. 7(d). Then, after a predetermined time (Td), the terminal voltage of the capacitor (10) reaches the judgment level (Tl(2)) of the signal width discriminator (8), and the signal width discriminator (8) reaches the level shown in FIG. 7(e). The latch circuit (9
) works. As a result, the latch circuit (9) shown in Fig. 7 (h
) The switching element (6) is actuated with an output as shown in FIG. In other words, in this case, the ground fault detection device will operate unnecessarily.
［発明が解決しようとする課題］
従来の地絡検出装置は以上のように構成されているので
、零相変流器の平衡特性により電動機などの起動時にお
ける突入電流によって地絡検出装置が不要動作する問題
があった。[Problem to be solved by the invention] Since the conventional ground fault detection device is configured as described above, the balance characteristic of the zero-phase current transformer eliminates the need for a ground fault detection device due to inrush current when starting a motor, etc. There was a problem with it working.
この発明は上記のような問題を解決するためになされた
もので、突入電流などによる不要動作を防止できる地絡
検出装置を提供することを目的とする。This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a ground fault detection device that can prevent unnecessary operations due to rush current or the like.
［課題を解決するための手段］
この発明に係る地絡検出装置は、零相変流器の地絡成分
の正側及び負側の波形毎に所定の大きさを越えるとき出
力信号を出す正側レベル判別器及び負側レベル判別器と
、上記正側及び負側レベル判別器の各々の出力信号が所
定の時間幅以上であることを判別する正側信号幅判別器
及び負側信号幅判別器と、上記正側及び負側信号幅判別
器の各々の出力信号が一回あるいは複数回出力されたと
き出力信号を出すパルスカウント判別回路とを備え、上
記パルスカウント判別回路にてスイッチング素子を作動
させるようにしたものである。[Means for Solving the Problems] The ground fault detection device according to the present invention provides a positive detection device that outputs an output signal when each of the positive and negative waveforms of the ground fault component of a zero-phase current transformer exceeds a predetermined magnitude. a side level discriminator, a negative side level discriminator, and a positive side signal width discriminator and a negative side signal width discriminator for discriminating that each output signal of the positive side and negative side level discriminators is a predetermined time width or more. and a pulse count discrimination circuit that outputs an output signal when each output signal of the positive side and negative side signal width discrimination devices is output once or multiple times, and the pulse count discrimination circuit includes a switching element. It was made to work.
［作 用コ
この発明における地絡検出装置は、正側及び負側レベル
判別器と正側及び負側信号幅判別器とパルスカウント判
別回路を設けたことにより、零相変流器の正側及び負側
の地絡成分が所定のレベル及び所定の時間幅以上であり
、且つ正側及び負側の地絡成分が各々−回あるいは複数
回出力されたときを判別し、スイッチング素子を作動さ
せることができる。[Function] The ground fault detection device according to the present invention is provided with a positive side and negative side level discriminator, a positive side and negative side signal width discriminator, and a pulse count discriminator circuit. and determines when the negative side ground fault component is at a predetermined level and a predetermined time width or more, and when the positive side and negative side ground fault components are each output - times or multiple times, and activates the switching element. be able to.
［実施例］ 以下、この発明の一実施例を図について説明する。[Example] An embodiment of the present invention will be described below with reference to the drawings.
第１図はこの発明の一実施例を示す構成図である。図に
おいて、第５図と対応する部分には同一符号を付し、そ
の詳細説明は省略する。FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, parts corresponding to those in FIG. 5 are designated by the same reference numerals, and detailed explanation thereof will be omitted.
（１１）は零相変流器（４）の出力を入力として入力信
号波形の正側の大きさが所定の判定レベル（＋ＴＨ１）
以上のとき出力信号を出す正側レベル判別器、（１２）
は零相変流器（４）の出力を入力として入力信号波形の
負側の大きさが所定の判定レベル（−ＴＨＩ）以上のと
き出力信号を出す負側レベル判別器、（１３）は正側レ
ベル判別器（１１）の出力信号の時間幅が所定の時間幅
以上かどうかを判別する正側信号幅判別器、（１４）は
負側レベル判別器（１２）の出力信号の時間幅が所定の
時間幅以上かどうかを判別する負側信号幅判別器、（１
５）は正側信号幅判別器（１３）及び負側信号幅判別器
（１４）の各々の出力信号を入力とするパルスカウント
判別回路である。また、（１６） 、 （１７）は夫々
正側信号幅判別器（１３）、負側信号幅判別器（１４）
の入力側に設けられた時間幅設定用コンデンサである。(11) uses the output of the zero-phase current transformer (4) as input, and the magnitude of the positive side of the input signal waveform is a predetermined judgment level (+TH1).
A positive level discriminator that outputs an output signal when the above conditions are met, (12)
is a negative side level discriminator which takes the output of the zero-phase current transformer (4) as input and outputs an output signal when the magnitude of the negative side of the input signal waveform is equal to or higher than a predetermined judgment level (-THI), and (13) is a positive side level discriminator. A positive side signal width discriminator (14) determines whether the time width of the output signal of the side level discriminator (11) is greater than or equal to a predetermined time width. Negative side signal width discriminator, (1
5) is a pulse count discriminator circuit which receives the output signals of the positive side signal width discriminator (13) and the negative side signal width discriminator (14). In addition, (16) and (17) are the positive side signal width discriminator (13) and the negative side signal width discriminator (14), respectively.
This is a time width setting capacitor provided on the input side of the .
なお、本実施例においてパルスカウント判別回路（１５
）は正側信号ラッチ回路（１５ａ）、（１５ｃ） 、負
側信号ラッチ回路（１５ｂ） 。In addition, in this embodiment, the pulse count discrimination circuit (15
) are positive side signal latch circuits (15a), (15c) and negative side signal latch circuit (15b).
（１５ｄ）および＾ＮＤ回路（１５ｅ）から構成される
。(15d) and an ND circuit (15e).
次に第２図に示すタイミングチャートに従って第１図の
一般の地絡検出動作について説明する６図において、第
２図（ａ）は交流電路（１）の地籍成分信号を、第２図
（ｂ）は零相変流器（４）の出力を示す、零相変化流器
（４）の出力が正側レベル判別器（１１）の判定レベル
（＋ＴＨ１）を第２図（ｂ）に示すように超えると正側
レベル判別器（１１）内の定電流源出力回路（図示せず
）が動作して、第２図（ｃ）に示すような出力を発生し
、これによりコンデンサ（１６）を充電する。よってコ
ンデンサ（１６）の端子電圧は第２図（ｄ）に示すよう
に上昇する。すると、所定の時間（Ｔｄ）後コンデンサ
（１６）の端子電圧は正側信号幅判別器（１３）の判定
レベル（ＴＨ２）に達し、正側信号幅判別器（１３）の
第２図（ｅ）に示すような出力信号にてパルスカウント
判別回路（１５）内の正側信号ラッチ回路（１５ａ）が
動作して、第２図（ｉ）に示すような出力を発生する。Next, in FIG. 6, which explains the general ground fault detection operation of FIG. 1 according to the timing chart shown in FIG. 2, FIG. ) indicates the output of the zero-phase current transformer (4), and the output of the zero-phase change current transformer (4) indicates the judgment level (+TH1) of the positive level discriminator (11) as shown in Figure 2 (b). When the voltage exceeds the current level, the constant current source output circuit (not shown) in the positive level discriminator (11) operates and generates an output as shown in Fig. 2(c), which causes the capacitor (16) to Charge. Therefore, the terminal voltage of the capacitor (16) increases as shown in FIG. 2(d). Then, after a predetermined time (Td), the terminal voltage of the capacitor (16) reaches the judgment level (TH2) of the positive side signal width discriminator (13), and the terminal voltage of the positive side signal width discriminator (13) as shown in FIG. ) The positive side signal latch circuit (15a) in the pulse count discrimination circuit (15) operates in response to an output signal as shown in FIG. 2(i), and generates an output as shown in FIG. 2(i).
また、同様に零相変流器（４）の出力が負側レベル判別
器（１２）の判定レベル（−ＴＲＩ）を第２図（ｂ）に
示すように超えると負側レベル判別器（１２）内の定電
流源出力回路（図示せず）が動作して、第２図（ｆ）に
示すような出力を発生し、これによりコンデンサ（１７
）を充電する。よってコンデンサ（１７）の端子電圧は
第２図（ｇ）に示すように上昇する。すると、所定の時
間（Ｔｄ）後コンデンサ（１７）の端子電圧は負側信号
幅判別器（１４）の判定レベル（ＴＨ２）に達し、負側
信号幅判別器（１４）の第３図（ｈ）に示すような出力
信号にてパルスカウント判別回路（１５）内の負側信号
ラッチ回路（１５ｂ）が動作して、第２図（ｂ）に示す
ような出力を発生する。このようにして、零相変流器（
４）からの正側信号および負側信号が各々２回検出され
、正側信号ラッチ回路（１５ｃ）の第２図（ｊ）に示す
ような出力と負側信号ラッチ回路（１５ｄ）の第２図（
ｔ’）に示すような出力の論理積が成立した時点でＡＮ
Ｄ回路（１５ｅ）の第２図（１１）に示すような出力に
てサイリスタ等のスイッチング素子（６）を作動させて
電磁装置（５）を介し遮断器（３）を引き外して、交流
電路（１）を遮断することができる。Similarly, when the output of the zero-phase current transformer (4) exceeds the judgment level (-TRI) of the negative level discriminator (12) as shown in FIG. ) in the constant current source output circuit (not shown) operates to generate an output as shown in Figure 2(f), which causes the capacitor (17
). Therefore, the terminal voltage of the capacitor (17) increases as shown in FIG. 2(g). Then, after a predetermined time (Td), the terminal voltage of the capacitor (17) reaches the judgment level (TH2) of the negative side signal width discriminator (14), and the terminal voltage of the negative side signal width discriminator (14) as shown in FIG. ) The negative side signal latch circuit (15b) in the pulse count discrimination circuit (15) operates in response to the output signal shown in FIG. 2(b), and generates the output shown in FIG. 2(b). In this way, the zero-phase current transformer (
4) are detected twice each, and the positive side signal latch circuit (15c) outputs as shown in FIG. 2(j) and the negative side signal latch circuit (15d) outputs the second signal as shown in FIG. figure(
AN at the point when the logical product of the outputs as shown in
The output shown in Figure 2 (11) of the D circuit (15e) activates a switching element (6) such as a thyristor, trips the circuit breaker (3) via the electromagnetic device (5), and disconnects the AC circuit. (1) can be blocked.
次に第３図に示すタイミングチャートに従って電動機な
どの起動時における突入電流による平衡特性に対する動
作について説明する。Next, according to the timing chart shown in FIG. 3, an explanation will be given of the operation with respect to the balance characteristic due to inrush current at the time of starting a motor or the like.
図において、地絡あるいは漏電でないため、第３図（ａ
）に示す交流電路（１）の地絡成分信号は無い、しかし
電動機などの起動時における突入電流により零相変流器
（４）に第３図（ｂ）に示すような出力信号が発生する
。一般に第３図（ｂ）に示す出力信号は最初は高いレベ
ルであるが減衰が早く、正側信号と負側信号とのレベル
の差が大きい。In the figure, there is no ground fault or leakage, so Figure 3 (a)
) There is no ground fault component signal in the AC line (1) shown in Figure 3(b), but due to the inrush current when starting the motor etc., an output signal as shown in Figure 3(b) is generated in the zero-phase current transformer (4). . Generally, the output signal shown in FIG. 3(b) is initially at a high level, but attenuates quickly, and the difference in level between the positive side signal and the negative side signal is large.
第３図（ｂ）の正側信号において、１．２発目とも正側
レベル判別器（１１）の判定レベル（＋ＴＨ１）を超え
ている。−力負側信号において１発目は負側しベル判別
器（１２）の判定レベル（−ＴＨＩ）を超えているが２
発目は判定レベル（−ＴＩ（１）を超えていない。この
ような場合、第３図（ｄ）の正側信号時開幅設定用コン
デンサ（１６）の端子電圧において、１発目は正側信号
幅判別器（１３）の判定レベル（ＴＩ２）に達している
が、２発目は判定レベル（ＴＩ２）に達しない。In the positive side signal of FIG. 3(b), both the 1st and 2nd shots exceed the judgment level (+TH1) of the positive level discriminator (11). - In the force negative side signal, the first shot is negative and exceeds the judgment level (-THI) of the Bell discriminator (12), but 2
The first shot does not exceed the judgment level (-TI (1). In this case, the first shot does not exceed the positive signal opening width setting capacitor (16) in Figure 3(d). Although the judgment level (TI2) of the side signal width discriminator (13) has been reached, the second shot does not reach the judgment level (TI2).
また、第３図（ｇ＞の負側信号時間幅設定用コンデンサ
（１７）の端子電圧において、１発目は負側信号幅判別
器（１４）の判定レベル（ＴＩ２）に達しているが２発
目は判定レベル（ＴＩ２）に達しないこととなる。In addition, the terminal voltage of the negative side signal time width setting capacitor (17) in Figure 3 (g>) reaches the judgment level (TI2) of the negative side signal width discriminator (14) in the first shot, The number of hits does not reach the judgment level (TI2).
このようにして、パルスカウント判別回路（１５）内の
ラッチ回路（１５ｃ） 、 （１５ｄ）が第３図（ｊ）
、第３図（１）に示すように動作しないため、交流電路
（１）を遮断する動作には到らない。In this way, the latch circuits (15c) and (15d) in the pulse count discrimination circuit (15) are configured as shown in FIG. 3(j).
, does not operate as shown in FIG. 3 (1), and therefore does not reach the operation of cutting off the AC line (1).
このように本実施例では、零相変流器の正側出力信号と
負側出力信号の各々のパルスカウント判別回路の論理積
にて遮断動作を行うため、電動機などの起動時における
突入電流に対して不要動作しにくい地絡検出装置を構成
することができる。In this way, in this embodiment, the interrupting operation is performed by the logical product of the pulse count discrimination circuits of the positive output signal and the negative output signal of the zero-phase current transformer, so that the inrush current at the time of starting the motor, etc. On the other hand, it is possible to construct a ground fault detection device that is less likely to operate unnecessarily.
以上、この発明の一実施例を図について説明してきたが
、本実施例ではパルスカウント判別回路の構成は零相変
流器の正側出力信号と負側出力信号が各２発出力された
時遮断動作するを論理構成である。An embodiment of the present invention has been described above with reference to the drawings. In this embodiment, the configuration of the pulse count discrimination circuit is such that when two positive output signals and two negative output signals are output from the zero-phase current transformer, The shutoff operation is a logical configuration.
次に、この発明の他の実施例として、パルスカウント判
別回路の論理構成を変えた地絡検出装置の回路構成を第
４図にて説明する１図において、パルスカウント判別回
路以外は前述の一実施例と同一である。Next, as another embodiment of the present invention, the circuit configuration of a ground fault detection device in which the logic configuration of the pulse count discrimination circuit is changed is shown in FIG. Same as the example.
パルスカウント判別回路（１５＾）は、正側信号幅判別
器（１３）の出力信号をカウントするラッチ回路（１５
ｍ）、（１５ｄ）、（１５ｆ）、（１５ｉ）、負側信号
幅判別器（１４）の出力信号をカウントするラッチ回路
（１５ｂ） 、 （１５ｃ）（１５ｇ） 、 （１５ｈ
）およびＯＲ回路（１５ｊ）で構成される。The pulse count discrimination circuit (15^) is a latch circuit (15) that counts the output signal of the positive side signal width discriminator (13).
m), (15d), (15f), (15i), latch circuit (15b), (15c) (15g), (15h) that counts the output signal of the negative side signal width discriminator (14)
) and an OR circuit (15j).
本実施例は、正側信号幅判別器（１３）の出力信号を受
け付けた後負側信号幅判別器（１４）の出力信号を受け
付ける論理手段、及び負側信号幅判別器（１４）の出力
信号を受け付けた後正側信号幅判別器（１３）の出力信
号を受け付ける論理手段を備えたこと、を特徴とする。This embodiment includes logic means that receives the output signal of the negative signal width discriminator (14) after receiving the output signal of the positive signal width discriminator (13), and the output of the negative signal width discriminator (14). The present invention is characterized in that it includes logic means that receives the output signal of the positive side signal width discriminator (13) after receiving the signal.
次に、本実施例の動作について説明する。零相変流器（
４）から正側信号幅判別器（１３）および負側信号幅判
別器（１４）までの動作は前述の実施例と同一である。Next, the operation of this embodiment will be explained. Zero-phase current transformer (
The operations from 4) to the positive side signal width discriminator (13) and the negative side signal width discriminator (14) are the same as in the previous embodiment.
バルスカウンＩ・判別回路（１５＾）をこのように構成
することにより、零相変流器（４）からの出力信号が
正側信号中負側信号に）正側信号中負側信号あるいは
負側信号に）正側信号中負側信号中正側信号の順番にて
パルスカウント判別回路（１５＾）に入力されたとき、
ＯＲ＠路（１５ｊ）を通じて交流電路（１）を遮断する
ことができる。By configuring the valve counter I/discrimination circuit (15^) in this way, the output signal from the zero-phase current transformer (4) can be changed into a negative side signal during a positive side signal, or a negative side signal during a positive side signal, or a negative side signal during a positive side signal. When input to the pulse count discrimination circuit (15^) in the order of positive side signal, negative side signal, and positive side signal,
The AC line (1) can be interrupted through the OR@ line (15j).
この一実施例では、零相変流器の出力の正側信号と負側
信号を各々パルスカウントするとともに、正側信号に）
負側信号中正側信号に）負側信号あるいは負側信号中正
側信号に）負側信号中正側信号の論理動作にて遮断動作
を行うため、電動機などの起動時における突入電流に対
して、前述の第１実施例よりさらに高精度の不要動作し
にくい地絡検出装置を構成することができる。In this example, the positive side signal and the negative side signal of the output of the zero-phase current transformer are each counted as pulses, and the positive side signal)
Since the cut-off operation is performed based on the logical operation of the negative signal (to the positive signal during the negative signal) or the positive signal during the negative signal (to the positive signal during the negative signal), the inrush current at the time of starting a motor, etc. It is possible to construct a ground fault detection device that is more accurate than the first embodiment and less prone to unnecessary operations.
［発明の効果」
この発明は以上説明したように、零相変流器の地絡成分
の正側及び負側の波形毎に所定の大きさを越えるとき出
力信号を発生する正側レベル判別器及び負側レベル判別
器と、正側レベル判別器及び負側レベル判別器の各々の
出力信号が所定の時間幅以上であることを判別する正側
信号幅判別器及び負側信号幅判別器と、正側信号幅判別
器及び負側信号幅判別器の各々の出力信号が一回あるい
は複数回出力されたとき出力信号を出すパルスカウント
判別回路とを備えたので、通常の地絡及び漏電とは異な
る電動機などの起動時における突入電流あるいは雷など
の外来雑音に対して、不要動作しにくい地絡検出装置を
提供することができる効果がある。[Effects of the Invention] As explained above, the present invention provides a positive level discriminator that generates an output signal when each of the positive and negative waveforms of the ground fault component of a zero-phase current transformer exceeds a predetermined magnitude. and a negative side level discriminator, and a positive side signal width discriminator and a negative side signal width discriminator that determine that each output signal of the positive side level discriminator and the negative side level discriminator is a predetermined time width or more. , a pulse count discrimination circuit that outputs an output signal when the output signal of each of the positive side signal width discriminator and the negative side signal width discriminator is output once or multiple times. This has the effect of being able to provide a ground fault detection device that is less likely to operate unnecessarily in response to an inrush current at the time of starting up a different electric motor or external noise such as lightning.
第１図はこの発明による地絡検出装置の一実施例を示す
回路構成図、第２図、第３図は第１図の動作説明に供す
るための波形図、第４図はこの発明による地絡検出装置
の他の実施例を示す回路構成図、第５図は従来の地絡検
出装置を示す回路構成図、第６図、第７図は第５図の動
作説明に供するための波形図である。
図において、（１）は交流電路、（４）は零相変流器、
（６）はスイッチング素子、（１１）は正側レベル判別
器、（１２）は負側レベル判別器、（１３）は正側信号
幅判別器、（１４）は負側信号幅判別器、（１５）。
（１５＾）はパルスカウント判別回路である。
なお、各図中同一符号は同一または相当部分を示す。
代 理 人 大 岩 増 雄凡２図
ん３図
（ｍ） ’ （ｒｎ）□尤５図
昂６図 昂７図FIG. 1 is a circuit configuration diagram showing an embodiment of the ground fault detection device according to the present invention, FIGS. 2 and 3 are waveform diagrams for explaining the operation of FIG. 1, and FIG. A circuit configuration diagram showing another embodiment of the fault detection device, FIG. 5 is a circuit configuration diagram showing a conventional ground fault detection device, and FIGS. 6 and 7 are waveform diagrams for explaining the operation of FIG. 5. It is. In the figure, (1) is an AC line, (4) is a zero-phase current transformer,
(6) is a switching element, (11) is a positive side level discriminator, (12) is a negative side level discriminator, (13) is a positive side signal width discriminator, (14) is a negative side signal width discriminator, ( 15). (15^) is a pulse count discrimination circuit. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masu Oiwa Yubon 2nd figure 3rd figure (m) ' (rn) □Yu 5 figure 6 figure 7 figure
Claims (3)
を検出する零相変流器の地絡成分が所定の大きさ以上の
ときスイッチング素子を作動する地絡検出装置において
、 交番出力である上記地絡成分の正側及び負側の波形毎に
所定の大きさを越えるとき出力信号を発生する正側レベ
ル判別器及び負側レベル判別器と、上記正側レベル判別
器及び上記負側レベル判別器の各々の出力信号が所定の
時間幅以上であることを判別する正側信号幅判別器及び
負側信号幅判別器と、 上記正側信号幅判別器及び上記負側信号幅判別器の各々
の出力信号が一回あるいは複数回出力されたとき出力信
号を出すパルスカウント判別回路と を備え、上記パルスカウント判別回路の出力により上記
スイッチング素子を作動させるようにしたことを特徴と
する地絡検出装置。(1) In a ground fault detection device that operates a switching element when a ground fault component of a zero-phase current transformer that is electromagnetically coupled to an AC power line and detects a ground fault in the AC power line is greater than or equal to a predetermined magnitude, an alternating output is provided. a positive level discriminator and a negative level discriminator that generate output signals when each of the positive and negative waveforms of the ground fault component exceeds a predetermined magnitude; a positive side signal width discriminator and a negative side signal width discriminator for determining whether each output signal of the side level discriminator has a predetermined time width or more; and the positive side signal width discriminator and the negative side signal width discriminator. and a pulse count discrimination circuit that outputs an output signal when each output signal of the device is output once or multiple times, and the switching element is actuated by the output of the pulse count discrimination circuit. Ground fault detection device.
ント回路と、負側パルスカウント回路と、正側パルスカ
ウント回路の出力信号と負側パルスカウント回路の出力
信号との論理積をとる論理積回路とを備えたことを特徴
とする請求項第１項記載の地絡検出装置。(2) The above-mentioned pulse count discrimination circuit includes a positive side pulse count circuit, a negative side pulse count circuit, and an AND circuit that takes the logical product of the output signal of the positive side pulse count circuit and the output signal of the negative side pulse count circuit. 2. The ground fault detection device according to claim 1, further comprising:
器の出力信号を受け付けた後負側信号幅判別器の出力信
号を受け付ける論理手段および負側信号幅判別器の出力
信号を受け付けた後正側信号幅判別器の出力信号を受け
付ける論理手段とを備えたことを特徴とする請求項第１
項記載の地路検出装置。(3) The above-mentioned pulse count discriminator circuit includes a logic means that receives an output signal of the negative side signal width discriminator after receiving the output signal of the positive side signal width discriminator, and a logic means that receives the output signal of the negative side signal width discriminator after receiving the output signal of the negative side signal width discriminator. Claim 1, further comprising: logic means for receiving the output signal of the positive side signal width discriminator.
Ground road detection device as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33544590A JP2774377B2 (en) | 1990-11-28 | 1990-11-28 | Ground fault detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33544590A JP2774377B2 (en) | 1990-11-28 | 1990-11-28 | Ground fault detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04200229A true JPH04200229A (en) | 1992-07-21 |
| JP2774377B2 JP2774377B2 (en) | 1998-07-09 |
Family
ID=18288642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33544590A Expired - Lifetime JP2774377B2 (en) | 1990-11-28 | 1990-11-28 | Ground fault detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2774377B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004519185A (en) * | 2001-02-01 | 2004-06-24 | ハイドロ − エアー、インコーポレイテッド | Ground fault circuit breaker applicable to aircraft |
| US7248451B2 (en) | 2001-02-01 | 2007-07-24 | Hydro-Aire, Inc. | Current fault detector and circuit interrupter and packaging thereof |
| US7362551B2 (en) | 2001-02-01 | 2008-04-22 | Hydro-Aire, Inc. | Aircraft applicable circuit imbalance detection and circuit interrupter and packaging thereof |
| JP2017194462A (en) * | 2016-04-18 | 2017-10-26 | エルエス産電株式会社Lsis Co., Ltd. | Analog signal detecting circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5731902B2 (en) * | 2011-05-20 | 2015-06-10 | 河村電器産業株式会社 | Earth leakage breaker |
-
1990
- 1990-11-28 JP JP33544590A patent/JP2774377B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004519185A (en) * | 2001-02-01 | 2004-06-24 | ハイドロ − エアー、インコーポレイテッド | Ground fault circuit breaker applicable to aircraft |
| US7248451B2 (en) | 2001-02-01 | 2007-07-24 | Hydro-Aire, Inc. | Current fault detector and circuit interrupter and packaging thereof |
| US7362551B2 (en) | 2001-02-01 | 2008-04-22 | Hydro-Aire, Inc. | Aircraft applicable circuit imbalance detection and circuit interrupter and packaging thereof |
| US7375937B2 (en) | 2001-02-01 | 2008-05-20 | Hydro-Aire, Inc. | Current fault detector and circuit interrupter and packaging thereof |
| US7667935B2 (en) | 2001-02-01 | 2010-02-23 | Hydro-Aire, Inc. | Aircraft applicable circuit imbalance detection and circuit interrupter and packaging thereof |
| US7672099B2 (en) | 2001-02-01 | 2010-03-02 | Hydro-Aire, Inc. | Current fault detector and circuit interrupter and packaging thereof |
| US7688558B2 (en) | 2001-02-01 | 2010-03-30 | Hydro-Aire, Inc. | Aircraft applicable circuit imbalance detection and circuit interrupter and packaging thereof |
| JP2017194462A (en) * | 2016-04-18 | 2017-10-26 | エルエス産電株式会社Lsis Co., Ltd. | Analog signal detecting circuit |
| US10466279B2 (en) | 2016-04-18 | 2019-11-05 | Lsis Co., Ltd. | Analog signal detecting circuit for processing an analog signal for monitoring by discriminating the normal signal from noise |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2774377B2 (en) | 1998-07-09 |
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