JPH0340351B2 - - Google Patents
Info
- Publication number
- JPH0340351B2 JPH0340351B2 JP56116343A JP11634381A JPH0340351B2 JP H0340351 B2 JPH0340351 B2 JP H0340351B2 JP 56116343 A JP56116343 A JP 56116343A JP 11634381 A JP11634381 A JP 11634381A JP H0340351 B2 JPH0340351 B2 JP H0340351B2
- Authority
- JP
- Japan
- Prior art keywords
- ground fault
- voltage
- power supply
- point
- ground
- 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
- 238000000034 method Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Particle Accelerators (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
本発明は直流電源回路の地絡位置検出方法に係
り、さらに詳しくは直流電源装置が複数台直列接
続され、かつその電源に対して複数台の負荷回路
が直列接続された直流電源ループにおいて、地絡
事故が発生した場合の地絡ポイント検出方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting the position of a ground fault in a DC power supply circuit, and more specifically, the present invention relates to a method for detecting the position of a ground fault in a DC power supply circuit. The present invention relates to a method for detecting a ground fault point when a ground fault occurs in a DC power supply loop.
第１図は従来のこの種の回路系統図であつて、
入力遮断器１およびサイリスタ２により構成され
た電源装置を直列接続し、回路電圧を直列接続し
た回路数分だけ上昇させ、負荷（マグネツト）３
に直流電圧を与えている。この負荷３もループ形
に多数配置されるもので、あるシンクロトロン
（加速器）システムによつては、全周３Km以上に
なる極めて大きな設備構成となる場合もある。こ
れらの電源および負荷は発熱するため一般に水冷
方式により冷却されるが、構造上の問題から地絡
事故が発生する要因は大である。 FIG. 1 is a conventional circuit system diagram of this type.
A power supply device composed of an input circuit breaker 1 and a thyristor 2 is connected in series, and the circuit voltage is increased by the number of circuits connected in series.
DC voltage is applied to. A large number of loads 3 are also arranged in a loop, and some synchrotron (accelerator) systems may have extremely large equipment configurations with a total circumference of 3 km or more. These power sources and loads generate heat and are generally cooled by water cooling, but structural problems are a major factor in ground faults.
かかる装置において地絡の検出は電源ライン
L1，L2の両端間に抵抗４，４′を直列接続し、中
間ポイントに電流動作形の地絡リレー５および地
絡位置検出用のシヤント抵抗６を直列的に設け、
そのシヤント抵抗６に地絡モニター７を接続し、
シヤント抵抗６により検出したシヤント電流で地
絡モニター７を動作させ、電源ループに地絡事故
が発生したことを確認している。 In such equipment, ground fault detection is performed on the power line.
Resistors 4 and 4' are connected in series between both ends of L 1 and L 2 , and a current-operated ground fault relay 5 and a shunt resistor 6 for ground fault position detection are provided in series at the intermediate point.
Connect the ground fault monitor 7 to the shunt resistor 6,
A ground fault monitor 7 is operated using the shunt current detected by the shunt resistor 6, and it is confirmed that a ground fault has occurred in the power supply loop.
しかしながら、この方式は電流動作形の地絡検
出方式のため、地絡位置と地絡電流の特性が直線
的でないため、地絡事故が発生した場合、その地
絡位置を高精度に求めることはむずかしかつた。 However, since this method is a current-operated ground fault detection method, the characteristics of the ground fault position and ground fault current are not linear, so when a ground fault occurs, it is difficult to accurately determine the ground fault position. It was difficult.
本発明は前述の従来技術の欠点に鑑み、簡単な
回路を付加するだけで高精度に電源供給ループ内
の地絡ポイントを検知することができる方法を提
供することにある。 SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a method that can detect a ground fault point in a power supply loop with high accuracy by simply adding a simple circuit.
本発明は、電源側ラインの中間点を直接接地す
ると共に、負荷側の中間点を仮想接地する回路構
成とし、これにより検出した地絡電圧と電源電圧
をモニターしておき、地絡事故時の電源電圧と地
絡電圧とを直線で結び、この直線の延長線が０ラ
インと交わる点を地絡事故地点としてモニター検
出し、地絡地点の確認を迅速かつ容易にしたもの
である。 The present invention has a circuit configuration in which the midpoint of the power line is directly grounded and the midpoint of the load side is virtually grounded, and the detected ground fault voltage and power supply voltage are monitored thereby, and in the event of a ground fault. The power supply voltage and the ground fault voltage are connected with a straight line, and the point where the extension of this straight line intersects with the 0 line is monitored and detected as the ground fault point, thereby making it possible to quickly and easily confirm the ground fault point.
以下、第２図〜第４図に従つて本発明を詳述す
る。第２図はその具体的な一例を示した回路構成
図であつて、第１図と同一符号を付してあるもの
は同一機能を有する。第２図においては、電源装
置のラインL3の中間ポイントを直接接地してあ
る。ラインL1，L2間には抵抗８が接続してあつ
て、この抵抗８の両端電圧を検出する電圧検出器
９が設けてある。この電圧検出器９の出力は地絡
モニター７に入力してある。また負荷３の中間ポ
イントには２個のサイリスタD1，D2を逆並列接
続して接地してある。このサイリスタD1，D2が
後述する仮想接地サイリスタである。また、サイ
リスタD1，D2の接続両端の電圧を検出する、い
わゆる地絡電圧検出回路１０が設けてある。この
地絡電圧検出回路１０の出力も前述の地絡モニタ
ー７に入力してある。１１はサイリスタD1，D2
のゲート制御を行なうパルス発生器であつて、そ
の超動信号は地絡電圧検出回路１０より印加され
る。 Hereinafter, the present invention will be explained in detail with reference to FIGS. 2 to 4. FIG. 2 is a circuit configuration diagram showing a specific example thereof, and the same reference numerals as in FIG. 1 have the same functions. In FIG. 2, the midpoint of line L3 of the power supply is directly grounded. A resistor 8 is connected between the lines L 1 and L 2 , and a voltage detector 9 is provided to detect the voltage across the resistor 8 . The output of this voltage detector 9 is input to a ground fault monitor 7. Further, two thyristors D 1 and D 2 are connected in antiparallel to the intermediate point of the load 3 and grounded. These thyristors D 1 and D 2 are virtual ground thyristors described later. Furthermore, a so-called ground fault voltage detection circuit 10 is provided to detect the voltage across the connection of the thyristors D 1 and D 2 . The output of this ground fault voltage detection circuit 10 is also input to the above-mentioned ground fault monitor 7. 11 are thyristors D 1 and D 2
This is a pulse generator that performs gate control, and its supermotion signal is applied from the ground fault voltage detection circuit 10.
第２図に示す回路の等価回路を示すと第３図の
如くとなる。同等価回路においてE1，E2は複数
設置され第２図のサイリスタ２に対応するもの
で、その中間ポイントは接地してある。R1，R2
〜Roは負荷であり、VEは仮想接地制御系であ
る。 An equivalent circuit of the circuit shown in FIG. 2 is shown in FIG. 3. In the equivalent circuit, a plurality of E 1 and E 2 are installed and correspond to the thyristor 2 shown in FIG. 2, and the intermediate point thereof is grounded. R1 , R2
~R o is the load and VE is the virtual ground control system.
さらに、第３図は第２図の等価回路に基づいて
示した地絡地点の検出原理を示した図であつて、
これら第２図〜第４図に従つてその地絡位置検出
法を説明する。 Furthermore, FIG. 3 is a diagram showing the principle of detecting the ground fault point based on the equivalent circuit of FIG.
The ground fault position detection method will be explained with reference to FIGS. 2 to 4.
すなわち、負荷回路に地絡がなく電源供給が正
常に行なわれている場合は、第４図の直線ａモー
ドの如く、仮想接地電圧を０ボルトとし、＋−対
象に電圧分布がなされている。いま、負荷３の途
中、すなわち、第３図の抵抗R1とR2との間に地
絡事故が発生したとすると、ｂモードの如く地絡
電圧が発生し、電圧分布図が変化し、−VE2なる
地絡電圧が発生する。これによつて、仮想接地点
を０ボルトとした電圧特性がくずれ、地絡位置を
０ボルトとした電圧特性となる。 That is, when there is no ground fault in the load circuit and the power is being supplied normally, the virtual ground voltage is set to 0 volts and the voltage distribution is symmetrical to + and -, as shown in the straight line a mode in FIG. Now, if a ground fault occurs in the middle of load 3, that is, between resistors R 1 and R 2 in Figure 3, a ground fault voltage will occur as in mode b, and the voltage distribution diagram will change. A ground fault voltage of −VE 2 occurs. As a result, the voltage characteristics in which the virtual ground point is 0 volts are distorted, and the voltage characteristics are changed to those in which the ground fault position is 0 volts.
また、抵抗R2とR3の間で地絡事故が発生する
とｃモードの如くとなり、前述のｂモード同様仮
想接地間に地絡電圧−VE1なる電圧が発生し、ｂ
モード同様の現象が得られる。 In addition, if a ground fault occurs between resistors R 2 and R 3 , a mode like c occurs, and as in the b mode described above, a voltage of ground fault voltage −VE 1 is generated between the virtual grounds, and b
A phenomenon similar to the mode can be obtained.
さらに、仮想接地ポイントＰよりみて−電源ラ
インに地絡事故が発生した場合は＋の地絡電圧が
発生し、逆に＋電源ラインに発生した場合には−
の地絡電圧が発生し、これは負荷の地絡位置に応
じて微小に電圧変化がある。 Furthermore, when viewed from the virtual grounding point P, if a ground fault occurs in the - power line, a + ground fault voltage will occur, and conversely, if it occurs in the + power line, -
A ground fault voltage is generated, and this voltage varies slightly depending on the location of the ground fault in the load.
上述の原理図で説明したように電源電圧と仮想
接地方式により検出した、地絡電圧と電源電圧と
を第２図のモニター回路７によりモニターしてお
き、地絡事故事の電源電圧と地絡電圧とを直線で
結び、この直線延長線が０ラインと交わる点が地
絡事故地点として求められる。更に詳述すれば、
第３図の例では、検出仮想接地電圧VEが負とな
る。理由は、負荷中点より正極側（ｂ又はｃ）で
地絡を起しているからである。 As explained in the principle diagram above, the ground fault voltage and power supply voltage detected by the power supply voltage and virtual grounding method are monitored by the monitor circuit 7 in Fig. 2, and the power supply voltage and the power supply voltage in the event of a ground fault are monitored by The voltage is connected with a straight line, and the point where this straight line extension intersects with the 0 line is determined as the ground fault point. To be more detailed,
In the example of FIG. 3, the detected virtual ground voltage VE is negative. The reason is that a ground fault has occurred on the positive electrode side (b or c) from the midpoint of the load.
そこで、負極側電源検出電圧による電圧点
（Ro，−Ｅ）と（Ｏ，VE）とを結ぶ直線を求め、
その延長線上での横軸との交点を求める。この交
点が地絡負荷位置となる。第４図では、ｂモード
ではR2が地絡位置、ｃモードではR3が地絡位置
として求められる。 Therefore, find a straight line connecting the voltage point (R o , -E) and (O, VE) due to the negative power supply detection voltage,
Find the intersection point with the horizontal axis on the extension line. This intersection becomes the ground fault load position. In FIG. 4, R 2 is determined as the ground fault position in b mode, and R 3 is determined as the ground fault position in c mode.
一方、地絡位置が負荷中点より負極側で地絡を
起している場合には、VE＞Ｏであるから、電圧
点（R1，＋Ｅ）と（Ｏ，VE）とを結ぶ直線を求
め、その延長線上での横軸との交点が地絡負荷位
置となる。 On the other hand, if the ground fault occurs on the negative side of the load midpoint, VE>O, so draw a straight line connecting the voltage points (R 1 , +E) and (O, VE). The intersection of the extended line with the horizontal axis is the ground fault load position.
なお、第４図の地絡特性図は抵抗に付した番号
にて図示したが、実際上は電源供給ループ内の負
荷配列に従い、距離と負荷の番号を横軸とし、縦
軸に電圧をとつて、第２図の如き地絡モニター７
により監視していれば、運転中の地絡状況が即時
に検知できる。 Although the ground fault characteristics diagram in Figure 4 is shown using the numbers assigned to the resistors, in reality, the distance and load number are plotted on the horizontal axis, and the voltage is plotted on the vertical axis, according to the load arrangement in the power supply loop. Therefore, the ground fault monitor 7 as shown in Figure 2
If the ground fault condition is monitored during operation, it can be detected immediately.
負荷回路で地絡事故が発生した場合の地絡地点
検出は上述の如くであるが、次に地絡事故が生じ
た場合のその電源回路系の保護について説明す
る。 Detection of a ground fault point when a ground fault occurs in a load circuit is as described above. Next, protection of the power supply circuit system when a ground fault occurs will be explained.
すなわち、第２図の如き地絡電圧検出回路１０
により地絡電圧を検出すると、その出力信号によ
りパルス発生器１１を起動する。その出力パルス
信号により仮想接地サイリスタD1，D2を点弧す
る。このサイリスタの導通によつて負極回路を接
地すると共に、出力パルス信号Ａによつて電源装
置側のサイリスタ２を非導通制御し、さらには入
力遮断器１を開成制御することによつて、同回路
を電源から開放し、それを保護する。 That is, the ground fault voltage detection circuit 10 as shown in FIG.
When a ground fault voltage is detected, the pulse generator 11 is activated by its output signal. The output pulse signal fires the virtual ground thyristors D 1 and D 2 . The conduction of this thyristor grounds the negative circuit, and the output pulse signal A controls the thyristor 2 on the power supply side to become non-conductive, and further controls the input circuit breaker 1 to open. Disconnect it from the power source and protect it.
なお、上記実施例においては完全接地の場合に
ついて述べてあり、完全接地状態になるとインピ
ーダンスは数ｋΩ程度となり、確実に地絡ポイン
ト検出できるが、不完全接地、すなわちインピー
ダンスが大きい場合も考えられる。不完全接地状
態となる場合の高インピーダンスは数10kΩと極
めて高いものとなるが、これは一時的に制御系の
マグネツトコイルが純水に浸る等の事故が考えら
れ、インピーダンス特性から良好にその位置が検
出できにくい。しかしそのように高インピーダン
スとなつた場合についての地絡検出は特に必要と
せず、継続して電送制御を行なつても何ら問題な
いものである。 In the above embodiment, the case of complete grounding is described, and when the impedance is in a completely grounded state, the impedance is about several kΩ, and the ground fault point can be detected reliably, but incomplete grounding, that is, a case where the impedance is large, is also possible. The high impedance in the case of incomplete grounding is extremely high, several tens of kΩ, but this may be due to an accident such as the control system's magnetic coil being temporarily immersed in pure water, and the impedance characteristics indicate that the impedance is extremely high. Difficult to detect position. However, it is not particularly necessary to detect a ground fault in such a case where the impedance becomes high, and there is no problem in continuing to perform power transmission control.
上述の実施例からも明らかなように本発明によ
れば、電源電圧と仮想接地方式により検出した地
絡電圧と電源電圧をモニターしておき、地絡事故
時の電源電圧と地絡電圧とを直線で結び、この直
線延長部が０ボルトラインと交わる点から地絡事
故地点を検出するようにしたものであるから、極
めて簡単にしかも高精度に地絡地点を求めること
ができる。したがつて地絡地点検出のために要す
る時間は少なくて済み、復旧も早くなるという利
点並びに効果がある。 As is clear from the above-described embodiments, according to the present invention, the power supply voltage and the ground fault voltage and power supply voltage detected by the virtual grounding method are monitored, and the power supply voltage and the ground fault voltage at the time of a ground fault accident are monitored. Since the lines are connected by straight lines and the ground fault point is detected from the point where this straight line extension intersects with the 0 volt line, the ground fault point can be found extremely easily and with high precision. Therefore, there are advantages and effects in that the time required to detect the ground fault point is short and recovery is quick.
第１図は電源供給ループにおける地絡地点検出
回路の系統図、第２図は本発明の一実施例を示す
地絡地点検出回路の系統図、第３図は第２図の等
価回路図、第４図は第３図の等価回路に基づいて
地絡地点を検出した場合の電圧特性図である。
８……抵抗、９……電圧検出器、１０……地絡
電圧検出回路、１１……パルス発生器、D1，D2
……サイリスタ。
FIG. 1 is a system diagram of a ground fault point detection circuit in a power supply loop, FIG. 2 is a system diagram of a ground fault point detection circuit showing an embodiment of the present invention, and FIG. 3 is an equivalent circuit diagram of FIG. 2. FIG. 4 is a voltage characteristic diagram when a ground fault point is detected based on the equivalent circuit of FIG. 3. 8... Resistor, 9... Voltage detector, 10... Earth fault voltage detection circuit, 11... Pulse generator, D 1 , D 2
...thyristor.
Claims (1)
２の直流電源を有し、その中間位置が接地されて
なる直流電源部と、該直流電源部に直列に接続さ
れてなる複数の負荷Ri（ｉ＝１〜ｎ）と、上記負
荷中間位置で仮想接地電圧VEを検出する地絡電
圧検出器と、を有し、 横軸に地絡位置を示す負荷Ri、縦軸に仮想接
地電圧VEをとる直交座標系のもとで検出仮想接
地電圧VEの極性により電圧点（R1，＋Ｅ）又は
（Ro，−Ｅ）のいずれか一方を選び、この選択し
た電圧点と（Ｏ，VE）とを結ぶ直線を求め、こ
の直線と横軸との交点負荷位置を地絡位置として
特定してなる直流電源回路の地絡位置検出方法。[Claims] 1. A DC power supply unit having first and second DC power supplies connected in series with a power supply voltage of E, the intermediate position of which is grounded, and a DC power supply unit connected in series to the DC power supply unit. and a ground fault voltage detector that detects a virtual ground voltage VE at the intermediate position of the load, and the horizontal axis indicates the ground fault position. Under the orthogonal coordinate system in which the vertical axis is the virtual ground voltage VE, select either the voltage point (R 1 , +E) or (R o , -E) depending on the polarity of the detected virtual ground voltage VE. A method for detecting the ground fault position in a DC power supply circuit by finding a straight line connecting the voltage point and (O, VE), and identifying the load position where this straight line intersects with the horizontal axis as the ground fault position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11634381A JPS5818173A (en) | 1981-07-27 | 1981-07-27 | Detector for grounding position of dc power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11634381A JPS5818173A (en) | 1981-07-27 | 1981-07-27 | Detector for grounding position of dc power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5818173A JPS5818173A (en) | 1983-02-02 |
| JPH0340351B2 true JPH0340351B2 (en) | 1991-06-18 |
Family
ID=14684594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11634381A Granted JPS5818173A (en) | 1981-07-27 | 1981-07-27 | Detector for grounding position of dc power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5818173A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH065254B2 (en) * | 1985-09-06 | 1994-01-19 | エナジーサポート株式会社 | Fault current detection display device |
| JP5192706B2 (en) * | 2006-03-16 | 2013-05-08 | 東京電力株式会社 | Ground fault point search device and ground fault point search method using the same |
| WO2011067847A1 (en) * | 2009-12-03 | 2011-06-09 | 東芝三菱電機産業システム株式会社 | Secondary battery system |
| JP5695736B2 (en) * | 2011-03-24 | 2015-04-08 | 東芝三菱電機産業システム株式会社 | Ground fault detection circuit |
| CN102866327B (en) * | 2012-09-13 | 2015-07-22 | 山西省电力公司大同供电分公司 | Small-current grounding system fault transient traveling wave detection device and method |
| CN103353573A (en) * | 2013-06-18 | 2013-10-16 | 国家电网公司 | Rapid test stopping method of power grid grounding fault |
| CN110133450B (en) * | 2019-06-19 | 2020-04-14 | 山东大学 | Distribution network partition equivalence-based fault positioning method and system |
-
1981
- 1981-07-27 JP JP11634381A patent/JPS5818173A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5818173A (en) | 1983-02-02 |
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