JPS5821315Y2 - Earth fault detection circuit - Google Patents
Earth fault detection circuitInfo
- Publication number
- JPS5821315Y2 JPS5821315Y2 JP16634777U JP16634777U JPS5821315Y2 JP S5821315 Y2 JPS5821315 Y2 JP S5821315Y2 JP 16634777 U JP16634777 U JP 16634777U JP 16634777 U JP16634777 U JP 16634777U JP S5821315 Y2 JPS5821315 Y2 JP S5821315Y2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistor
- series
- constant voltage
- ground fault
- 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
Links
Description
【考案の詳細な説明】
この考案は直流線路の地絡事故を検出する地絡検出回路
に関し、その目的は整定された動作値に対してより精度
高く検出動作を行うよう改善することにある。[Detailed Description of the Invention] This invention relates to a ground fault detection circuit that detects ground faults in DC lines, and its purpose is to improve the circuit so that it can perform detection operations with higher accuracy for established operating values.
以下本考案の１実施例について図面を参照しながら説明
する。An embodiment of the present invention will be described below with reference to the drawings.
第１図において直流線路に接続される正・負端子間に定
電圧ダイオードＺＤ１．ＺＤ２、抵抗ＲＩＯの直列回路
が接続されている。In FIG. 1, a constant voltage diode ZD1. is connected between the positive and negative terminals connected to the DC line. A series circuit of ZD2 and resistor RIO is connected.
定電圧ダイオードＺＤ、には抵抗Ｒ１，Ｒ２でなる第１
の分圧回路と、抵抗Ｒ３，Ｒ４でなる第２の分圧回路と
が接続されている。The constant voltage diode ZD has a first resistor consisting of resistors R1 and R2.
A voltage dividing circuit is connected to a second voltage dividing circuit including resistors R3 and R4.
また定電圧ダイオードｚＤ２には抵抗Ｒ５，Ｒ６でなる
第１の分圧回路と、抵抗Ｒ７゜Ｒ８でなる第２の分圧回
路とが接続されている。Further, a first voltage dividing circuit including resistors R5 and R6 and a second voltage dividing circuit including resistors R7 and R8 are connected to the constant voltage diode zD2.
抵抗Ｒ□、Ｒ２の接続点はダイオードＤ１をへて抵抗Ｒ
９の一端に接続され、抵抗Ｒ５，Ｒ６の接続点はダイオ
ードＤ３をへて抵抗Ｒ９の一端に接続される。The connection point of resistors R□ and R2 is connected to resistor R through diode D1.
The connection point between resistors R5 and R6 is connected to one end of resistor R9 via diode D3.
抵抗Ｒ３，Ｒ４の接続点はダイオードＤ２、抵抗Ｒ１□
の直列回路をへて抵抗Ｒ９の一端に接続される。The connection point of resistors R3 and R4 is diode D2 and resistor R1□
The resistor R9 is connected to one end of the resistor R9 through a series circuit.
抵抗Ｒ７，Ｒ８の接続点はダイオードＤ４、抵抗Ｒ１２
の直列回路をへて抵抗Ｒ９の一端に接続される。The connection point of resistors R7 and R8 is diode D4 and resistor R12.
The resistor R9 is connected to one end of the resistor R9 through a series circuit.
抵抗Ｒ９の他端は接地用端子をへて接地される。The other end of the resistor R9 is grounded through a grounding terminal.
次に動作について説明する。Next, the operation will be explained.
直流線路の正側・負側のいずれかに地絡事故が生じると
第１図に示すよう地絡抵抗Ｒｇが接続されたことになる
。If a ground fault occurs on either the positive or negative side of the DC line, a ground fault resistance Rg will be connected as shown in FIG.
ここで説明の便宜のため直流電圧を４８Ｖ、ＺＤｌ、Ｚ
Ｄ２を１２Ｖ、２／Ｒ，−／Ｒ６：＝ ｌ、８４福、＝
８掻 −Ｒ５
＝２と仮定する。Here, for convenience of explanation, the DC voltage is 48V, ZDl, Z
D2 to 12V, 2/R, -/R6:= l, 84 fortune, =
Assume that 8-R5=2.
まず負側に地絡事故が生じたときについて第２図を参照
しながら説明する。First, the case where a ground fault occurs on the negative side will be explained with reference to FIG.
地絡抵抗Ｒｇがかなり犬であるときには抵抗Ｒ５，Ｒ６
の分圧回路で生じた分圧電圧は６ｖであり、抵抗Ｒ７゜
Ｒ８の分圧回路で生じた分圧電圧は４Ｖである。When the ground fault resistance Rg is quite large, resistors R5 and R6
The divided voltage generated by the voltage dividing circuit of resistors R7 and R8 is 6V, and the divided voltage generated by the voltage dividing circuit of resistors R7 and R8 is 4V.
従って地絡電流１１がダイオードＤ３、抵抗Ｒ９、Ｒｇ
をへて流れる。Therefore, the ground fault current 11 is caused by diode D3, resistor R9, Rg
flowing through.
このときダイオードＤ４には逆電圧が加えられるため、
ダイオードＤ４はオフで電流は流れない。At this time, a reverse voltage is applied to the diode D4, so
Diode D4 is off and no current flows.
地絡抵抗Ｒｇが小さい場合には抵抗Ｒ６゜Ｒｇ ＊ Ｒ
ｇのなす並列抵抗回路の総合抵抗が小さくなるため、抵
抗Ｒ６の両端電圧は６ｖより小さくなり、この電圧は６
ｖより小さくなり、Ｒ９＋ＲｇＯ値がＲ６と等しくなる
と抵抗Ｒ６，Ｒ９，Ｒｇの並列抵抗回路の総合抵抗はＲ
５−Ｒ６のしになり、抵抗Ｒ６の両端電圧は４ｖになる
。If the ground fault resistance Rg is small, the resistance R6゜Rg * R
Since the total resistance of the parallel resistance circuit formed by g becomes smaller, the voltage across resistor R6 becomes smaller than 6V, and this voltage becomes 6V.
When the value of R9+RgO becomes equal to R6, the total resistance of the parallel resistance circuit of resistors R6, R9, and Rg becomes R.
5-R6, and the voltage across the resistor R6 becomes 4V.
地絡抵抗Ｒｇがさらに小さくなってこの電圧が４ｖより
さらに低下するとダイオードＤ４、抵抗Ｒ１２をへて電
流１２が流れることになる。When the ground fault resistance Rg becomes smaller and the voltage drops further below 4V, a current 12 will flow through the diode D4 and the resistor R12.
すなわち地絡抵抗ＲｇがＲｇ〈Ｒ６−Ｒ９となったとき
ダイオードＤ４に電流が流れ、抵抗Ｒ１゜の両端に電圧
が生じる。That is, when the ground fault resistance Rg becomes Rg<R6-R9, a current flows through the diode D4, and a voltage is generated across the resistor R1°.
このとき抵抗Ｒ６および抵抗Ｒ８の両端電圧はそれぞれ
４ｖ以下になるが、抵抗Ｒ８の両端電圧は、抵抗Ｒ６の
両端電圧より若干すなわち抵抗Ｒ１２に生じる電圧１２
ＸＲ□２だげ高くなる。At this time, the voltage across resistor R6 and resistor R8 each becomes 4V or less, but the voltage across resistor R8 is slightly higher than the voltage across resistor R6, that is, the voltage generated across resistor R12 is 12V.
XR□2 becomes more expensive.
従って抵抗Ｒ９を可変抵抗として適当な値に整定すると
、とのＲ９の整定された値に対応する地絡抵抗になった
ことが検出できる。Therefore, when the resistor R9 is set to an appropriate value as a variable resistor, it can be detected that the ground fault resistance corresponds to the set value of R9.
電源線路の正側に地絡事故が生じた場合には同様に第３
図に示すようにＲ＜Ｒ，−Ｒ９で電流ｉ３が流れ、Ｒ＞
Ｒ１−Ｒ９で電流ｉ４が流れる。If a ground fault occurs on the positive side of the power supply line, the third
As shown in the figure, current i3 flows at R<R, -R9, and R>
Current i4 flows through R1-R9.
以上実施例について説明したように、本考案によれば定
電圧素子で定電圧をつくりこの定電圧を分圧するように
構成しているため、整定された動作値に対する検出精度
が極めて高いものとなる。As explained in the embodiments above, according to the present invention, a constant voltage is created by a constant voltage element and this constant voltage is divided into voltages, so that the detection accuracy for the set operating value is extremely high. .
第１図は本考案の１実施例を示す回路図、第２図及び第
３図は第１図を説明するための回路図である。
ＺＤｌ、ｚＤ２・・・・・・定電圧ダイオード、Ｒｏ・
・・・・・整定用可変抵抗、Ｒｇ・・・・・・地絡抵抗
。FIG. 1 is a circuit diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are circuit diagrams for explaining FIG. 1. ZDl, zD2... Constant voltage diode, Ro・
...Variable resistance for setting, Rg...Ground fault resistance.
Claims (1)
を直列接続し・て正端子から負側に定電圧をつくるとと
もに負端子から正側に定電圧をつくり、前記２個の定電
圧素子の１個毎に、上記各定電圧を分圧するための第１
．第２の２個の抵抗分圧回路をそれぞれ接続し、各端子
からみて第１の分圧電圧が第２の分圧電圧より犬となる
ようにし、前記第１の分圧点間に２個の一方向性素子を
直列接続するとともに前記第２の分圧点間に一方向性素
子と負荷抵抗との直列回路を２回路直列接続し、前記２
個の一方向性素子の接続点および前記２回路の接続点を
整定用可変抵抗を介して接地したことを特徴とする地絡
検出回路。Two constant voltage elements are connected in series between the positive and negative terminals connected to the DC line, and a constant voltage is created from the positive terminal to the negative side, and a constant voltage is created from the negative terminal to the positive side. For each constant voltage element, a first
．． Connect two second resistor voltage divider circuits so that the first divided voltage is higher than the second divided voltage when viewed from each terminal, and connect the two resistor voltage dividers between the first voltage divider points. The unidirectional elements are connected in series, and two series circuits of the unidirectional element and the load resistor are connected in series between the second voltage dividing point, and the second voltage dividing point is connected in series.
A ground fault detection circuit characterized in that a connection point between the two unidirectional elements and a connection point between the two circuits are grounded via a setting variable resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16634777U JPS5821315Y2 (en) | 1977-12-09 | 1977-12-09 | Earth fault detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16634777U JPS5821315Y2 (en) | 1977-12-09 | 1977-12-09 | Earth fault detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5490629U JPS5490629U (en) | 1979-06-27 |
| JPS5821315Y2 true JPS5821315Y2 (en) | 1983-05-06 |
Family
ID=29165566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16634777U Expired JPS5821315Y2 (en) | 1977-12-09 | 1977-12-09 | Earth fault detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5821315Y2 (en) |
-
1977
- 1977-12-09 JP JP16634777U patent/JPS5821315Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5490629U (en) | 1979-06-27 |
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