JP2760813B2 - DC circuit breaker - Google Patents
DC circuit breakerInfo
- Publication number
- JP2760813B2 JP2760813B2 JP63249863A JP24986388A JP2760813B2 JP 2760813 B2 JP2760813 B2 JP 2760813B2 JP 63249863 A JP63249863 A JP 63249863A JP 24986388 A JP24986388 A JP 24986388A JP 2760813 B2 JP2760813 B2 JP 2760813B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- circuit breaker
- commutation
- time
- circuit
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は遮断器の開極時間を改良した逆電流挿入方式
の直流遮断器に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse current insertion type DC circuit breaker in which the breaker opening time is improved.
従来の逆電流挿入方式の直流遮断器は、例えば電気評
論1980年９月号に記載の第３図のような構成となつてい
た。直流主線路１に直列に入れられた遮断器２とこれに
並列に接続された転流コンデンサ3,リアクトル4,転流ス
イツチ５よりなる転流回路10から構成される。A conventional reverse current insertion type DC circuit breaker has a configuration as shown in FIG. 3 described in, for example, September, 1980, Electric Review. It comprises a circuit breaker 2 connected in series with a DC main line 1 and a commutation circuit 10 composed of a commutation capacitor 3, a reactor 4, and a commutation switch 5 connected in parallel to the circuit breaker 2.
遮断動作を行なう場合は、第４図（Ａ）に示す如く、
遮断器２に時間t1で開極指令を与え、時間t2で遮断器２
が開極し鎖線のアークが発生後、転流スイツチ５を時間
t3で投入し、転流コンデンサ３からの放電電流を遮断器
２の通電電流と逆向きに流し込むと、遮断器２を通過す
る電流は時間t4で電流零点を迎え遮断器２は消弧し、主
線路電流は転流回路10へ転流して遮断動作を完了する。
尚、第４図（Ａ）は短絡電流i1の場合であり、同図
（Ｂ）は通常電流i2の場合である。When the shut-off operation is performed, as shown in FIG.
It gives the opening command at time t 1 the circuit breaker 2, the circuit breaker 2 at time t 2
Is opened and the commutation switch 5 is turned on
was charged with t 3, when flowing a discharge current from the commutation capacitor 3 to the conduction current in the opposite direction of the circuit breaker 2, the circuit breaker 2 welcomed current zero point at the current time t 4 when passing through the circuit breaker 2 is extinguished Then, the main line current is commutated to the commutation circuit 10 to complete the cutoff operation.
Incidentally, FIG. 4 (A) shows a case of the short circuit current i 1, FIG. (B) shows the case of the normal current i 2.
このように、遮断器２を開極後に転流スイツチ５を動
作させると、遮断器２は大きなアーク電流を遮断するこ
とになり、真空バルブ１本で遮断できる電流には制限が
あり、この制限を越える遮断電流に対しては複数の真空
バルブを並列に使用する必要があつた。この場合には、
複数の真空バルブに流れる電流を均等にするためのバラ
ンス抵抗が必要となり、また複数の真空バルブの動作時
間のバラツキを小さくするための操作器の繁雑な調整が
必要である等の問題があつた。As described above, when the commutation switch 5 is operated after the circuit breaker 2 is opened, the circuit breaker 2 cuts off a large arc current, and the current that can be cut off by one vacuum valve is limited. It was necessary to use a plurality of vacuum valves in parallel for a breaking current of more than. In this case,
There were problems such as the necessity of a balance resistor for equalizing the current flowing through a plurality of vacuum valves, and the necessity of complicated adjustment of an operating device to reduce the variation in the operation time of the plurality of vacuum valves. .
本発明の目的は、真空バルブ１本で電流値を遮断でき
る直流遮断器を供給することにある。An object of the present invention is to provide a DC circuit breaker that can interrupt a current value with one vacuum valve.
真空バルブの遮断能力は、開極から遮断までのアーク
エネルギーと遮断時の電流変化率と再起電圧とによつて
主に支配されるが、このうち第１項の開極から遮断まで
のアークエネルギーは遮断器の開極と転流スイツチの投
入の時間差を制御することによつて抑制できる。すなわ
ち、転流スイツチの動作を遮断器の開極よりも早くし
て、かつ両者の時間差を遮断すべき電流値に応じて制御
する構成とすることにより、遮断器開極時の電流値を遮
断すべき電流よりも小さくすることができる。さらに詳
細には、転流コンデンサからの放電電流で遮断器に流れ
ている直流電流が零点近傍になった時点で遮断器を開極
させるように、前記電流検出器の検出値とその時間変化
から直線近似手法で転流スイッチ投入時刻での電流値を
予測して、この時間分だけ遮断器への開極指令発信時刻
を遅らせるようにした制御装置を設けることによって、
上記目的が達成される。The breaking ability of a vacuum valve is mainly controlled by the arc energy from opening to breaking, the current change rate at breaking, and the re-starting voltage. Can be suppressed by controlling the time difference between the opening of the circuit breaker and the closing of the commutation switch. That is, the operation of the commutation switch is made earlier than the opening of the circuit breaker, and the time difference between the two is controlled according to the current value to be cut off, so that the current value when the circuit breaker is opened is cut off. It can be smaller than the current to be performed. More specifically, from the detection value of the current detector and its time change, so as to open the circuit breaker when the DC current flowing through the circuit breaker with the discharge current from the commutation capacitor is near the zero point. By providing a control device that predicts the current value at the commutation switch closing time by a linear approximation method and delays the opening command transmission time to the circuit breaker by this time,
The above object is achieved.
転流コンデンサによつて供給される放電電流の最大値
は、遮断すべき電流の最大値より大きくなるように設定
され、遮断電流が一定の場合は転流スイツチの動作から
遮断器の開極までの時間を一定値に制御し、開極時にお
けるアーク電流を小さな値に抑制する。また遮断電流が
不定の場合は、電流検出器により主線路電流の絶対値と
時間変化率を測定して遮断点における電流値を予測し
て、この値とコンデンサによる放電電流波形を勘案して
開極時の遮断器接点間のアーク電流が、遮断すべき電流
の値にかかわらずほぼ一定の適度な小さな値となるよう
に転流スイツチの動作から遮断器の開極までの時間を制
御する。The maximum value of the discharge current supplied by the commutation capacitor is set to be larger than the maximum value of the current to be cut off.If the cut-off current is constant, from the operation of the commutation switch to the opening of the circuit breaker Is controlled to a constant value, and the arc current at the time of opening is suppressed to a small value. If the cutoff current is uncertain, the current detector measures the absolute value of the main line current and the rate of change with time, predicts the current value at the cutoff point, and takes into account this value and the discharge current waveform from the capacitor. The time from the operation of the commutation switch to the opening of the circuit breaker is controlled so that the arc current between the contacts of the circuit breaker at an extreme time becomes a constant small value that is almost constant regardless of the value of the current to be broken.
〔実施例〕 以下本発明の実施例を第１図，第２図を用いて説明す
る。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
直流主線路１に直列に入れられた遮断器２たとえば真
空遮断器とこれに並列に接続された転流コンデンサ3,リ
アクトル4,転流スイツチ５よりなる転流回路10から構成
されている。直流主線路１には電流検出器６が設けら
れ、この出力値によつて遮断器２および転流スイツチ５
の動作時間を制御する制御装置７が設けられている。The circuit comprises a circuit breaker 2 arranged in series with a DC main line 1, for example, a vacuum circuit breaker, and a commutation circuit 10 composed of a commutation capacitor 3, a reactor 4, and a commutation switch 5 connected in parallel to the circuit breaker. The DC main line 1 is provided with a current detector 6, and based on the output value, a circuit breaker 2 and a commutation switch 5 are provided.
Is provided with a control device 7 for controlling the operation time.
次に、転流回路10の作用について第２図により説明す
る。時間t1で遮断指令が与えられると、制御装置７は電
流検出器６で検出した値とその時間変化から直線近似法
で遮断点における電流値を予測して、この値とコンデン
サ３による放電電流波形を勘案して開極時の遮断器接点
間のアーク電流が遮断すべき電流の値にかかわらずほぼ
一定の適度な小さな値つまり電流零点近傍の電流値とな
るように、投入スイッチの投入時刻と遮断器接点の開極
時刻との時間差を制御して転流スイツチ５および遮断器
２に動作指令を与える。時間t2で転流スイツチ５が投入
されると転流コンデンサ３は転流回路10と遮断器２とで
構成される閉回路で振動放電し、遮断器２を通過する電
流は減少し、十分減少した電流零点近傍の時間t3で遮断
器２は開極し、やがて迎える電流零点で遮断器２は消弧
し、主線路電流は転流回路10へ転流して遮断動作を完了
する。Next, the operation of the commutation circuit 10 will be described with reference to FIG. When cutoff command at time t 1 is given, the controller 7 predicts the current value at cutoff point in the linear approximation method a value detected by the current detector 6 and its time variation, the discharge current according to the value and the capacitor 3 In consideration of the waveform, the closing time of the closing switch is set so that the arc current between the contacts of the breaker at the time of opening becomes almost a constant small value, that is, a current value near the current zero point regardless of the value of the current to be interrupted. And controlling the time difference between the switching time and the opening time of the circuit breaker contact to give an operation command to the commutation switch 5 and the circuit breaker 2. Time t commutation capacitor 3 when the commutation switch 5 is turned on at 2 vibrates discharge closed circuit composed of a commutation circuit 10 and circuit breaker 2, the current passing through the circuit breaker 2 is reduced, sufficient reduced breaker 2 at time t 3 in the vicinity of the current zero point has is opening, and the circuit breaker 2 in the current zero point to welcome finally extinguished, main line current complete commutated by breaking operation to commutation circuit 10.
このように、本発明では制御装置７を使用して転流ス
イツチ５を投入後に遮断器２の開極時間を電流零点近傍
で開極するようにしたので、アーク電流の小さい値でし
や断できるようになり、従来使用していた複数台の直流
遮断器を減少できるようになつたばかりでなく、真空バ
ルブ内の接点寿命を増加することができるようになつ
た。As described above, in the present invention, the opening time of the circuit breaker 2 is opened near the current zero point after the commutation switch 5 is turned on by using the control device 7, so that the arc current can be reduced with a small value. As a result, not only the number of DC breakers conventionally used can be reduced, but also the life of the contacts in the vacuum valve can be increased.
以上のように本発明によれば、遮断電流の大きさにか
かわらず開極時の小さなアーク電流を遮断することがで
きるため、直流遮断器としての遮断能力を数倍に拡大す
ることができると共に、電気的な接点寿命を増加するこ
とができる。As described above, according to the present invention, since a small arc current at the time of opening can be interrupted regardless of the magnitude of the interrupting current, the interrupting ability as a DC circuit breaker can be increased several times. And the life of the electrical contacts can be increased.
第１図は本発明の一実施例を示す直流遮断器の回路図、
第２図は本発明による直流遮断器の遮断器部を流れる遮
断電流の遮断特性図、第３図は従来の直流遮断器の回路
図、第４図は第３図の遮断特性図である。 １……直流主線路、２……遮断器、３……転流コンデン
サ、４……リアクトル、５……転流スイツチ、６……電
流検出器、７……制御装置。FIG. 1 is a circuit diagram of a DC circuit breaker showing one embodiment of the present invention,
FIG. 2 is a diagram showing a breaking characteristic of a breaking current flowing through a breaker section of the DC breaker according to the present invention, FIG. 3 is a circuit diagram of a conventional DC breaker, and FIG. 4 is a breaking characteristic diagram of FIG. DESCRIPTION OF SYMBOLS 1 ... DC main line, 2 ... Circuit breaker, 3 ... Commutation capacitor, 4 ... Reactor, 5 ... Commutation switch, 6 ... Current detector, 7 ... Control device.
Claims (1)
の遮断器に並列接続された転流スイッチと該転流スイッ
チからなる転流回路を備え、該転流スイッチを投入する
ことで流れる転流コンデンサからの放電電流を、該遮断
器に流れる直流電流の電流方向と逆向きに流すことによ
って該直流電流を遮断する直流遮断器において、転流コ
ンデンサからの放電電流で遮断器に流れている直流電流
が零点近傍になった時点で遮断器を開極させるように、
前記電流検出器の検出値とその時間変化から直線近似手
法で転流スイッチ投入時刻での電流値を予測して、この
時間分だけ遮断器への開極指令発信時刻を遅らせるよう
にした制御装置を設けたことを特徴とする直流遮断器。1. A main circuit having a circuit breaker and a current detector connected thereto, a commutation switch connected in parallel to the circuit breaker, and a commutation circuit including the commutation switch, wherein the commutation switch is turned on. In the DC breaker that cuts off the DC current by flowing the discharge current from the commutation capacitor flowing in the direction opposite to the current direction of the DC current flowing through the circuit breaker, the discharge current from the commutation capacitor To open the circuit breaker when the flowing DC current is near the zero point,
A control device that predicts the current value at the commutation switch closing time from the detection value of the current detector and its time change by a linear approximation technique, and delays the opening command transmission time to the circuit breaker by this time. A DC circuit breaker characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249863A JP2760813B2 (en) | 1988-10-05 | 1988-10-05 | DC circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249863A JP2760813B2 (en) | 1988-10-05 | 1988-10-05 | DC circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0298024A JPH0298024A (en) | 1990-04-10 |
| JP2760813B2 true JP2760813B2 (en) | 1998-06-04 |
Family
ID=17199310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63249863A Expired - Lifetime JP2760813B2 (en) | 1988-10-05 | 1988-10-05 | DC circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2760813B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6282622A (en) * | 1985-10-08 | 1987-04-16 | 三菱電機株式会社 | Dc circuit breaker circuit |
-
1988
- 1988-10-05 JP JP63249863A patent/JP2760813B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0298024A (en) | 1990-04-10 |
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Legal Events
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|---|---|---|---|
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|
| EXPY | Cancellation because of completion of term | ||
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