JPH0560063B2 - - Google Patents
Info
- Publication number
- JPH0560063B2 JPH0560063B2 JP60150869A JP15086985A JPH0560063B2 JP H0560063 B2 JPH0560063 B2 JP H0560063B2 JP 60150869 A JP60150869 A JP 60150869A JP 15086985 A JP15086985 A JP 15086985A JP H0560063 B2 JPH0560063 B2 JP H0560063B2
- Authority
- JP
- Japan
- Prior art keywords
- winding
- output
- case
- side power
- earth leakage
- 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.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 claims description 60
- 238000001514 detection method Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、各種の電気．電子装置の漏電を検出
する漏電検出器に関し、電源と装置との間に挿入
される電流トランスに対し、装置ケースとホツト
側電源線との間に、高抵抗を介して接続される巻
線を設けることにより、装置ケースのアースの有
無及び漏電を検出できるようにしたものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to various electrical applications. Regarding earth leakage detectors that detect earth leakage in electronic devices, a current transformer inserted between the power supply and the device has a winding connected through a high resistance between the device case and the hot power supply wire. By providing this, it is possible to detect the presence or absence of grounding in the device case and to detect electrical leakage.
従来の技術
従来の漏電検出器としては、例えば第４図に示
すものが知られている。第４図において、１は装
置、１０１は装置１のケース、１０２は内部負荷
であり、ケース１０１はアースされている。２は
電流トランス、３は検出回路である。BACKGROUND ART As a conventional earth leakage detector, one shown in FIG. 4, for example, is known. In FIG. 4, 1 is a device, 101 is a case of the device 1, 102 is an internal load, and the case 101 is grounded. 2 is a current transformer, and 3 is a detection circuit.
電流トランス２は電源と装置１との間に直列的
に挿入されるもので、２つの電源線Ｈ，Ｃのう
ち、ホツト側電源線Ｈを直列に含む巻線２１、コ
ールド側電源線Ｃを直列に含む巻線２２及び出力
巻線２３を含み、出力巻線２３を検出回路３に接
続してある。 The current transformer 2 is inserted in series between the power supply and the device 1, and among the two power supply lines H and C, a winding 21 including the hot side power line H in series, and a cold side power line C are connected. It includes a winding 22 and an output winding 23 in series, and the output winding 23 is connected to the detection circuit 3.
漏電のない正常の動作状態では、ホツト側巻線
２１を通つて流れる電流による起磁力と、コール
ド側巻線２２を通つて流れる電流による起磁力と
が、互いに逆方向で平衡するので、互いに打消し
合い、出力巻線２３には出力は生じない。これを
漏電なしとする。 In a normal operating state without leakage, the magnetomotive force due to the current flowing through the hot side winding 21 and the magnetomotive force due to the current flowing through the cold side winding 22 are balanced in opposite directions, so they cancel each other out. Therefore, no output is generated in the output winding 23. This is assumed to be no leakage.
ところが、ホツト側電源線Ｈがケース１０１に
導通イする漏電事故を生じると、ホツト側巻線２
１を通つて流れた電流が、ケース１０１を通つて
アースに流れ、コールド側巻線２２に流れる電流
が著しく減少する。このため、ホツト側巻線２１
とコールド側巻線２２との間の起磁力が不平衡に
なり、出力巻線２３に出力を生じる。その出力を
検出回路３で検出することにより漏電を検出する
ことできる。 However, if an electrical leakage accident occurs in which the hot side power supply line H is electrically connected to the case 101, the hot side winding 2
1 flows through the case 101 to ground, and the current flowing through the cold side winding 22 is significantly reduced. For this reason, the hot side winding 21
The magnetomotive force between the cold side winding 22 and the cold side winding 22 becomes unbalanced, and an output is generated in the output winding 23. By detecting the output with the detection circuit 3, an electric leakage can be detected.
発明が解決しようとする問題点
ところが、第４図に示す従来の漏電検出器で
は、ケース１０１がアースされていない場合に
は、漏電を生じても、漏電を生じていない正常時
と同様に、ホツト側電源線Ｈを流れる電流とコー
ルド側電源線Ｃを流れる電流が逆方向で等しくな
り、ホツト側巻線２１とコールド側巻線２２の起
磁力が互いに打消し合い、出力巻線２３には出力
を生じない。このため、アースがとられているか
否かは検知できないし、また、アースがとられて
いない場合には、漏電を検知することができない
のである。Problems to be Solved by the Invention However, in the conventional earth leakage detector shown in FIG. 4, if the case 101 is not grounded, even if a current leak occurs, the current leakage will occur in the same way as in a normal state without any current leakage. The current flowing through the hot side power supply line H and the current flowing through the cold side power supply line C become equal in opposite directions, and the magnetomotive forces of the hot side winding 21 and the cold side winding 22 cancel each other out, and the output winding 23 Produces no output. Therefore, it is not possible to detect whether or not the device is grounded, and if the device is not grounded, it is not possible to detect electrical leakage.
アースがとられている状態で漏電を生じた場合
にはそれ程の危険性はないが、アースがとられて
いない状態で漏電を生じた場合には、極めて危険
である。つまり、従来の漏電検出器は、最も危険
な、ケースがアースからが浮いた状態、及びこの
状態での漏電検知を行なうことができず、感電の
危険という重大な問題点があつた。 If a current leak occurs while the device is grounded, there is no serious danger, but if a current leak occurs without the device being grounded, it is extremely dangerous. In other words, conventional earth leakage detectors cannot detect electric leakage in the most dangerous state where the case is lifted from the ground, and in this state, there is a serious problem of risk of electric shock.
問題点を解決するための手段
上述する従来の問題点を解決するため、本発明
は、電源と装置とを結ぶ電源線に、ホツト側電源
線を直列に含む巻線、コールド側電源線を直列に
含む巻線及び出力巻線を有する電流トランスを挿
入し、前記出力巻線に検出回路を接続した漏電検
出器において、前記電流トランスに前記各巻線と
は異なる別の巻線を設け、この別の巻線を高抵抗
を介して、前記装置のケースとホツト側電源線と
の間に接続したことを特徴とする。Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides a winding including a hot side power line in series and a cold side power line connected in series to the power line connecting the power source and the device. In the earth leakage detector in which a current transformer having a winding included in the output winding and an output winding is inserted, and a detection circuit is connected to the output winding, the current transformer is provided with another winding different from each of the windings, and this separate winding is provided. The winding wire is connected between the case of the device and the hot-side power supply wire via a high resistance.
作 用
上記構成の漏電検出器において、装置のケース
がアースされている場合には、ケースとホツト側
電源線との間に接続される巻線に、高抵抗を通し
て電流が流れ、電流トランスの起磁力が不平衡に
なり、出力巻線に不平衡出力を生じる。Function In the earth leakage detector with the above configuration, if the case of the device is grounded, current flows through the winding connected between the case and the hot side power line through a high resistance, causing the current transformer to start. The magnetic forces become unbalanced, producing an unbalanced output in the output winding.
ところが、装置のケースが非アース状態になる
と、ケースとホツト側電源線との間に接続される
巻線に電流が流れなくなり、電流トランスは、ホ
ツト側巻線の起磁力と、コールド側巻線の起磁力
とが互いに打消し合う平衡状態となり、出力巻線
には出力は生じない。 However, when the case of the device becomes ungrounded, current no longer flows through the winding connected between the case and the hot side power supply wire, and the current transformer combines the magnetomotive force of the hot side winding with the cold side winding. An equilibrium state is reached in which the magnetomotive force of
次に、ホツト側電源線がケース側に漏電した場
合、高抵抗に流れる電流が低下することと、ホツ
ト側電源線とコールド側電源線に流れる電流が著
しく不平衡となることから、出力巻線の出力が高
レベルとなる。 Next, if the hot side power line leaks to the case side, the current flowing through the high resistance will drop and the current flowing through the hot side power line and the cold side power line will become significantly unbalanced, so the output winding output becomes high level.
上述のように、出力巻線の出力レベルは非アー
ス時には略零となり、漏電による不平衡出力時に
は、正常時のレベルより著しく高いレベルになる
から、これを検出回路で検出することにより、非
アース及び漏電を検出することができる。 As mentioned above, the output level of the output winding is approximately zero when it is not grounded, and when it is unbalanced due to leakage, it becomes significantly higher than the normal level. By detecting this with the detection circuit, it is possible to and can detect electrical leakage.
実施例
第１図は本発明に係る漏電検出器の電気回路図
である。図において、第４図と同一の参照符号は
同一性ある構成部分を示している。この実施例で
は、電源と装置１とを結ぶ電源線Ｈ，Ｃに、ホツ
ト側電源線Ｈを直列に含む巻線２１、コールド側
電源線Ｃを直列に含む巻線２２及び出力巻線２３
を有する電流トランス２を挿入し、出力巻線２３
に検出回路３を接続すると共に、電流トランス２
に、別の巻線２４を接続し、この巻線２４を装置
１のケース１０１とホツト側電源線Ｈとの間に高
抵抗Ｒを介して接続してある。高抵抗Ｒの抵抗値
は、ホツト側電源線Ｈから巻線２４を通してケー
ス１０１に流れる電流が人体に影響を与えない微
小値とあるように選定する。Embodiment FIG. 1 is an electrical circuit diagram of an earth leakage detector according to the present invention. In the figure, the same reference numerals as in FIG. 4 indicate the same components. In this embodiment, a winding 21 including a hot side power line H in series, a winding 22 including a cold side power line C in series, and an output winding 23 are connected to the power lines H and C connecting the power source and the device 1.
Insert the current transformer 2 with the output winding 23
The detection circuit 3 is connected to the current transformer 2.
Another winding 24 is connected to the other end, and this winding 24 is connected between the case 101 of the device 1 and the hot side power supply line H via a high resistance R. The resistance value of the high resistance R is selected so that the current flowing from the hot side power supply line H through the winding 24 to the case 101 is a minute value that does not affect the human body.
３は検出回路、Ｓはスイツチである。検出回路
３は整流回路３１とレベル検定器３２とを備えて
構成されている。 3 is a detection circuit, and S is a switch. The detection circuit 3 includes a rectifier circuit 31 and a level tester 32.
上記実施例の漏電検出器において、装置１のケ
ース１０１がアースされているか否かは、スイツ
チＳを閉じて行なう。アースされている場合に
は、ケース１０１とホツト側電源線Ｈとの間に接
続される巻線２４に、高抵抗Ｒを通して電流が流
れ、電流トランス２の起磁力が不平衡になり、出
力巻線２３に不平衡出力を生じる。 In the earth leakage detector of the above embodiment, whether or not the case 101 of the device 1 is grounded is determined by closing the switch S. When grounded, current flows through the winding 24 connected between the case 101 and the hot side power supply line H through the high resistance R, and the magnetomotive force of the current transformer 2 becomes unbalanced, causing the output winding to become unbalanced. This produces an unbalanced output on line 23.
ところが、装置１のケース１０１がアース断線
事故等により非アース状態になると、ケース１０
１とホツト側電源線Ｈとの間に接続される高抵抗
Ｒ及び巻線２４に電流が流れなくなる。このた
め、電流トランス２は、ホツト側巻線２１の起磁
力と、コールド側巻線２２の起磁力とが互いに打
消し合う平衡状態となるので、出力巻線２３には
出力は生じない。 However, if the case 101 of the device 1 becomes ungrounded due to a ground wire disconnection accident, the case 101
Current no longer flows through the high resistance R and the winding 24 connected between the power line 1 and the hot side power supply line H. Therefore, the current transformer 2 is in an equilibrium state in which the magnetomotive force of the hot side winding 21 and the magnetomotive force of the cold side winding 22 cancel each other out, so that no output is generated in the output winding 23.
次に、ホツト側電源線Ｈがケース１０１側に漏
電イした場合、高抵抗Ｒに流れる電流が低下する
ことと、ホツト側電源線Ｈとコールド側電源線Ｃ
に流れる電流が著しく不平衡となることから、出
力巻線２３の出力が高レベルとなる。 Next, if the hot side power supply line H leaks to the case 101 side, the current flowing through the high resistance R will decrease, and the hot side power supply line H and the cold side power supply line C
Since the current flowing in the output winding 23 becomes significantly unbalanced, the output of the output winding 23 becomes high level.
従つて、検出回路３のレベル検定器３２におい
て、非アース時の零レベルと漏電時の高レベルと
のレベルを検定することにより、非アース状態と
漏電状態を検知することができる。 Therefore, the non-earthed state and the earth leakage state can be detected by verifying the zero level at the time of non-earth and the high level at the time of earth leakage in the level tester 32 of the detection circuit 3.
上述のようなレベル検定器３２としては、ウイ
ンドウ．コンパレータが適している。その内で
も、特にフエイルセーフなウインドウ．コンパレ
ータ（例えば本出願人が先に提案した実願昭55−
791072号）が適している。第２図はその具体例を
示し、トランジスタTR1〜TR3によつて論理積演
算発振器を構成し、整流回路３１から与えられる
直流信号V1によつて発振を起すもので、その発
振出力を整流回路Ｄで整流して出力する。 As the level tester 32 as described above, a window. A comparator is suitable. Among them, especially fail-safe windows. A comparator (for example, the application proposed by the applicant in 1983)
791072) is suitable. FIG. 2 shows a specific example of this, in which an AND operation oscillator is configured by transistors TR 1 to TR 3 , and oscillation is caused by the DC signal V 1 given from the rectifier circuit 31, and the oscillation output is It is rectified by rectifier circuit D and output.
第２図のウインドウ．コンパレータは、回路故
障を生じると出力零となり、非アース時と共通の
出力となるのでフエイルセーフである。 Window in Figure 2. The comparator is fail-safe because the output becomes zero when a circuit failure occurs, and the output is the same as when it is not grounded.
整流回路３１及び整流回路Ｄも、例えば第３図
に示すような回路とすることにより、フエイルセ
ーフ化することができる。第３図において、D1，
D2はダイオード、C1，C2はコンデンサである。 The rectifier circuit 31 and the rectifier circuit D can also be made fail-safe by forming, for example, a circuit as shown in FIG. In Figure 3, D 1 ,
D 2 is a diode, and C 1 and C 2 are capacitors.
発明の効果
以上述べたように、本発明によれば、電源と装
置との間に挿入される電流トランスに対し、装置
ケースとホツト側電源線との間に、高抵抗を介し
て接続される巻線を設け、装置ケースのアースの
有無及び漏電を検出できる安全性、フエイルセー
ス性の高い漏電検出器を提供することができる。Effects of the Invention As described above, according to the present invention, the current transformer inserted between the power supply and the device is connected between the device case and the hot side power supply line via a high resistance. It is possible to provide a highly safe and fail-safe earth leakage detector that is provided with a winding and can detect the presence or absence of grounding in the device case and earth leakage.
第１図は本発明に係る漏電検出器の電気回路
図、第２図はレベル検定回路の電気回路図、第３
図は同じく整流回路の電気回路図、第４図は従来
の漏電検出器の電気回路図である。
１……装置、１０１……ケース、１０２……負
荷、２……電流トランス、２１……ホツト側巻
線、２２……コールド側巻線、２３……出力巻
線、２４……別の巻線、３……検出回路。
Fig. 1 is an electric circuit diagram of an earth leakage detector according to the present invention, Fig. 2 is an electric circuit diagram of a level verification circuit, and Fig. 3 is an electric circuit diagram of a level verification circuit.
This figure is also an electric circuit diagram of a rectifier circuit, and FIG. 4 is an electric circuit diagram of a conventional earth leakage detector. DESCRIPTION OF SYMBOLS 1... Device, 101... Case, 102... Load, 2... Current transformer, 21... Hot side winding, 22... Cold side winding, 23... Output winding, 24... Another winding. Line, 3...detection circuit.
Claims (1)
線を直列に含む巻線、コールド側電源線を直列に
含む巻線及び出力巻線を有する電流トランスを挿
入し、前記出力巻線に検出回路を接続した漏電検
出器において、前記電流トランスに前記各巻線と
は異なる別の巻線を設け、この別の巻線を高抵抗
を介して、前記装置のケースとホツト側電源線と
の間に接続したことを特徴とする漏電検出器。 ２ 前記検出回路は、ウインドウ．コンパレータ
でなることを特徴とする特許請求の範囲第１項に
記載の漏電検出器。 ３ 前記ウインドウ．コンパレータは、フエイル
セーフに構成されていることを特徴とする特許請
求の範囲第２項に記載の漏電検出器。[Claims] 1. A current transformer having a winding including a hot side power line in series, a winding including a cold side power line in series, and an output winding is inserted into the power line connecting the power source and the device, In the earth leakage detector in which a detection circuit is connected to the output winding, the current transformer is provided with another winding different from each of the windings, and this other winding is connected to the case of the device and the hot wire through a high resistance. An earth leakage detector characterized in that it is connected between a side power line and a power line. 2 The detection circuit is configured to detect a window. The earth leakage detector according to claim 1, comprising a comparator. 3 The window. 3. The earth leakage detector according to claim 2, wherein the comparator is configured in a fail-safe manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60150869A JPS6211175A (en) | 1985-07-08 | 1985-07-08 | Leak detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60150869A JPS6211175A (en) | 1985-07-08 | 1985-07-08 | Leak detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6211175A JPS6211175A (en) | 1987-01-20 |
| JPH0560063B2 true JPH0560063B2 (en) | 1993-09-01 |
Family
ID=15506154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60150869A Granted JPS6211175A (en) | 1985-07-08 | 1985-07-08 | Leak detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6211175A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69434514T2 (en) | 1993-12-24 | 2006-06-22 | Seiko Epson Corp. | Ink jet recording head |
| DE19580750C2 (en) * | 1994-06-13 | 2002-07-25 | Hitachi Ltd | Air flow rate measuring device |
| US7072278B2 (en) | 1995-02-14 | 2006-07-04 | Hitachi, Ltd. | Optical reproducing method for optical medium with aligned prepit portion |
| US5982738A (en) | 1995-02-14 | 1999-11-09 | Hitachi, Ltd. | Optical recording medium having at least wobbled synchronous information shared between tracks |
| JP2788022B2 (en) | 1995-02-14 | 1998-08-20 | 株式会社日立製作所 | Optical recording medium |
-
1985
- 1985-07-08 JP JP60150869A patent/JPS6211175A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6211175A (en) | 1987-01-20 |
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