JPH06276686A - Changing-over apparatus for phase of high voltage 3-phase power distribution line - Google Patents
Changing-over apparatus for phase of high voltage 3-phase power distribution lineInfo
- Publication number
- JPH06276686A JPH06276686A JP5061736A JP6173693A JPH06276686A JP H06276686 A JPH06276686 A JP H06276686A JP 5061736 A JP5061736 A JP 5061736A JP 6173693 A JP6173693 A JP 6173693A JP H06276686 A JPH06276686 A JP H06276686A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- phase
- distribution line
- current
- parallel
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、三相負荷電流の不平衡
が大きい高圧三相配電線において、単相負荷が接続され
ている相を残りの相に切り替えるために使用される高圧
三相配電線の相切替装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage three-phase distribution line having a large three-phase load current imbalance, which is used to switch the phase to which the single-phase load is connected to the remaining phase. The present invention relates to a phase switching device.
【０００２】[0002]
【従来の技術】高圧三相配電線に対する単相負荷の接続
は、三相中の任意の二相に対して行われることとなる
が、実際の系統においては単相負荷が特定の二相に集中
して接続されることが多い。このような場合には三相負
荷電流の不平衡状態を招き、電力設備の利用効率が悪く
なったり、三相誘導モータ等の負荷にも悪影響を及ぼし
たりする。2. Description of the Related Art A single-phase load is connected to a high-voltage three-phase distribution line for any two phases out of the three phases, but in an actual system, the single-phase load is concentrated on a specific two phases. Often connected. In such a case, an unbalanced state of the three-phase load current is brought about, the utilization efficiency of the electric power equipment is deteriorated, and the load of the three-phase induction motor or the like is adversely affected.
【０００３】そこでこのような場合には、単相負荷が接
続されている相を残りの相に切り替えることにより三相
負荷電流の不平衡を減少させることが考えられる。とこ
ろがこのためには長時間の停電工事を必要とするので、
通常は相の切り替えを行うことなく運用されていること
が多かった。Therefore, in such a case, it is possible to reduce the imbalance of the three-phase load current by switching the phase to which the single-phase load is connected to the remaining phase. However, this requires long blackout work, so
Usually, it was often operated without switching phases.
【０００４】上記の実情に鑑み、本発明者等は実質的に
無停電で相の切り替えを行うことができる相切替装置を
発明し、既に特願平4-228772号として特許出願した。こ
の先願の相切替装置は、図７に示すように配電線の切断
される相ｂの切断点Ｘと並列に第１開閉器１を取り付け
るとともに、前記切断点Ｘよりも負荷Ｌ側の点と接続さ
れる相ｃとの間に、第１開閉器１の開路に引続き高速で
閉動作を行う無接点開閉器３を取り付け、さらにこの無
接点開閉器３と並列にその閉動作に引続き閉動作を行う
第２開閉器２を取り付けたものである。In view of the above circumstances, the inventors of the present invention invented a phase switching device capable of switching phases substantially without interruption, and have already filed a patent application as Japanese Patent Application No. 4-228772. In the phase switching device of this prior application, as shown in FIG. 7, the first switch 1 is attached in parallel with the cutting point X of the phase b to be cut in the distribution line, and the point on the load L side of the cutting point X Between the phase c to be connected, the contactless switch 3 that performs a closing operation at high speed is attached to the open circuit of the first switch 1, and the closing operation is continued in parallel with the contactless switch 3. The second switch 2 for performing the above is attached.
【０００５】この相切替装置は、第１開閉器１をオンと
して切断点Ｘを切断したうえ、第１開閉器１をオフとす
ると同時に無接点開閉器３をオンとして瞬時に相の切り
替えを行い、更に第２開閉器２を閉じたうえで第２開閉
器２と並列に結線を行うという手順で工事を進行するた
めのものである。しかしこの先願の相切替装置におい
て、例えば第１開閉器が開放されていないにもかかわら
ず無接点開閉器を投入した場合には、相間短絡事故が発
生するおそれがあった。In this phase switching device, the first switch 1 is turned on to cut the disconnection point X, and the first switch 1 is turned off, and at the same time, the contactless switch 3 is turned on to instantaneously switch the phases. Further, the second switch 2 is further closed and then the wiring is connected in parallel with the second switch 2 to proceed with the construction. However, in the phase switching device of this prior application, for example, when the non-contact switch is turned on even though the first switch is not opened, there is a possibility that an interphase short circuit accident may occur.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、無停電で相の切り替えを行うこと
ができ、しかも短絡事故等の可能性を完全に防止できる
高圧三相配電線の相切替装置を提供するために完成され
たものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and is capable of switching phases without uninterruption, and also capable of completely preventing the possibility of a short circuit accident and the like. It has been completed to provide a phase switching device for electric wires.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、配電線の切断される相の切断点
と並列に第１開閉器を取り付けるとともに、前記切断点
よりも負荷側の点と接続される相との間に第１開閉器の
開路に引続き高速で閉動作を行う無接点開閉器を取り付
け、さらにこの無接点開閉器と並列にその閉動作に引続
き閉動作を行う第２開閉器を取り付けた相切替装置にお
いて、各開閉器に電流検出手段を設けるとともに、各開
閉器が動作する度に電流を検出して相の切替えを行って
いく制御装置を設けたことを特徴とするものである。DISCLOSURE OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, is to install a first switch in parallel with a breaking point of a phase of a distribution line to be cut, and to load the load more than the breaking point. Between the point on the side and the connected phase, a non-contact switch that performs a high-speed closing operation is installed following the opening of the first switch, and the closing operation is followed by a closing operation in parallel with the non-contact switch. In the phase switching device with the second switch attached, each switch is provided with a current detection means, and a control device is provided for detecting the current and switching the phase each time each switch is operated. It is characterized by.
【０００８】[0008]
【作用】本発明の高圧三相配電線の相切替装置は、各開
閉器に取り付けた電流検出手段により各開閉器の動作を
確認しつつ制御装置が相の切替えを進行するので、短絡
事故の発生を完全に防止しつつ相の切替えを完了するこ
とができる。なお、具体的な構成及び手順は次の実施例
によって詳細に説明する。In the phase switching device of the high-voltage three-phase distribution line of the present invention, the control device advances the phase switching while confirming the operation of each switch by the current detection means attached to each switch, so that a short circuit accident occurs. It is possible to complete the phase switching while completely preventing the above. The specific configuration and procedure will be described in detail with reference to the following embodiments.
【０００９】[0009]
【実施例】〔実施例１〕図１は第１の実施例の構成を示
す回路図であり、ａ，ｂ，ｃの三相配電線のａ−ｂ間に
接続されている負荷Ｌをａ−ｃ間に切り替える例を示し
ている。ここでｂを切断される相、ｃを接続される相、
Ｘを切断点とする。また１は切断される相ｂの切断点Ｘ
と並列に取り付けられた有接点式の第１開閉器（ＳＷ
）、３は切断点Ｘよりも負荷Ｌ側の点と接続される相
ｂとの間に設けられ、第１開閉器１の開路に引続き高速
で閉動作を行う無接点開閉器（ＳＣＲ）である。この
無接点開閉器３としては例えばサイリスタのような半導
体を利用した半導体スイッチが用いられる。更に２はこ
の無接点開閉器３と並列に取り付けられ、無接点開閉器
３の閉動作に引続き閉動作を行う第２開閉器（ＳＷ）
である。[Embodiment 1] FIG. 1 is a circuit diagram showing a configuration of a first embodiment, in which a load L connected between a and b of three-phase distribution lines a, b, and c is a- An example of switching between c is shown. Where b is the disconnected phase, c is the connected phase,
Let X be the cut point. Also, 1 is the cutting point X of the phase b to be cut
Contact type first switch (SW
) 3 is a contactless switch (SCR) that is provided between the point on the load L side of the disconnection point X and the phase b connected to it, and that closes the first switch 1 at high speed following the open circuit. is there. As the contactless switch 3, a semiconductor switch using a semiconductor such as a thyristor is used. Further, 2 is a second switch (SW) which is mounted in parallel with the non-contact switch 3 and performs the closing operation of the non-contact switch 3 continuously.
Is.
【００１０】本発明においては、これらの第１開閉器
１、第２開閉器２、無接点開閉器３の電源側にＣＴのよ
うな電流検出手段４（ＣＴ）、５（ＣＴ）、６（Ｃ
Ｔ）を取り付け、各開閉器の動作を確認できるように
してある。これらの電流検出手段４、５、６の出力は制
御装置７に入力されている。また制御装置７は第１開閉
器１、第２開閉器２、無接点開閉器３にそれぞれ接続さ
れ、これらの開閉動作を制御することができるようにな
っている。In the present invention, the current detecting means 4 (CT), 5 (CT), 6 (CT) such as CT is provided on the power source side of the first switch 1, the second switch 2, and the contactless switch 3. C
T) is attached so that the operation of each switch can be confirmed. The outputs of these current detecting means 4, 5, 6 are input to the control device 7. Further, the control device 7 is connected to the first switch 1, the second switch 2, and the contactless switch 3, respectively, and can control the opening / closing operations of these.
【００１１】次に図２を参照しつつ図１の装置の動作を
説明する。まず三相配電線のケーブルに図１のように各
機器を接続したうえ、第１開閉器１（ＳＷ）をオンと
する。このとき電流検出手段４（ＣＴ）に電流が流れ
ていることを制御装置７が確認し、もし電流が流れてい
ない場合には異常警報を発して動作を停止する。また電
流検出手段４（ＣＴ）に電流が流れていることが確認
されたときには、制御装置７が電線切断の指示を出し切
断される相ｂを切断点Ｘから切断する。Next, the operation of the apparatus shown in FIG. 1 will be described with reference to FIG. First, each device is connected to the cable of the three-phase distribution line as shown in FIG. 1, and then the first switch 1 (SW) is turned on. At this time, the control device 7 confirms that the current is flowing through the current detecting means 4 (CT), and if the current is not flowing, an abnormal alarm is issued and the operation is stopped. Further, when it is confirmed that the current is flowing in the current detecting means 4 (CT), the control device 7 issues an instruction to disconnect the electric wire and disconnects the phase b to be disconnected from the disconnection point X.
【００１２】次に第１開閉器１（ＳＷ）をオフとし、
これに引続き制御装置７が無接点開閉器３（ＳＣＲ）
を高速でオンとするが、本発明では第１開閉器１（ＳＷ
）をオフとした直後に、電流検出手段４（ＣＴ）に
電流が流れていないことを制御装置７が確認する。もし
第１開閉器１（ＳＷ）をオフとしたにもかかわらず電
流検出手段４（ＣＴ）に電流が流れていれば、第１開
閉器１（ＳＷ）がオフしていない等の異常があるの
で、直ちに異常警報を発し動作を停止する。Next, the first switch 1 (SW) is turned off,
Following this, the control device 7 is the contactless switch 3 (SCR).
Is turned on at a high speed, but in the present invention, the first switch 1 (SW
Immediately after turning off), the control device 7 confirms that no current is flowing in the current detecting means 4 (CT). If the current is flowing through the current detecting means 4 (CT) even though the first switch 1 (SW) is turned off, there is an abnormality such that the first switch 1 (SW) is not turned off. Therefore, an abnormal alarm is immediately issued and the operation is stopped.
【００１３】正常であることが確認されれば、制御装置
７が無接点開閉器３（ＳＣＲ）を高速でオンとしたう
えで電流検出手段６（ＣＴ）に電流が流れていること
を確認する。無接点開閉器３（ＳＣＲ）をオンとした
ことにより相切り替えができたこととなるが、無接点開
閉器３（ＳＣＲ）に長時間電流を流すことを避けるた
めにこれに引続き制御装置７が第２開閉器（ＳＷ）を
閉じる。このため、無接点開閉器３（ＳＣＲ）をオン
としたにもかかわらず電流検出手段６（ＣＴ）が電流
を検出しない場合にも、警報を発するだけで第２開閉器
（ＳＷ）を閉じる。If it is confirmed to be normal, the control device 7 turns on the non-contact switch 3 (SCR) at high speed, and then confirms that the current is flowing through the current detecting means 6 (CT). . By switching on the contactless switch 3 (SCR), it means that the phase can be switched. However, in order to prevent the current from flowing through the contactless switch 3 (SCR) for a long time, the controller 7 continues to do so. The second switch (SW) is closed. Therefore, even if the current detecting means 6 (CT) does not detect the current even though the contactless switch 3 (SCR) is turned on, the second switch (SW) is closed only by issuing an alarm.
【００１４】そして電流検出手段５（ＣＴ）に電流が
流れていることを確認したうえで破線で示すように電線
を結線する。しかし、もし電流検出手段５（ＣＴ）に
電流が流れていない場合には第２開閉器（ＳＷ）がオ
ンとなっていないため、異常警報を発して動作を停止す
る。このようにして電線の結線を完了したら、無接点開
閉器３（ＳＣＲ）と第２開閉器（ＳＷ）をオフとし
て各機器を取り外し、全ての作業が完了する。Then, after confirming that the current is flowing in the current detecting means 5 (CT), the electric wire is connected as shown by the broken line. However, if no current is flowing through the current detecting means 5 (CT), the second switch (SW) is not turned on, so an abnormal alarm is issued and the operation is stopped. When the wire connection is completed in this way, the non-contact switch 3 (SCR) and the second switch (SW) are turned off to remove each device, and all the work is completed.
【００１５】なお、相切り替えの瞬間における各開閉器
の動作のタイムチャートを図３に示す。このタイムチャ
ートにＴとして示された時間が停電時間となるが、その
長さは商用周波数の半サイクル程度で済むので、ほとん
ど無停電で相切り替え工事を行えることとなる。A time chart of the operation of each switch at the moment of phase switching is shown in FIG. The time indicated as T in this time chart is the power outage time, but since the length of the power outage time is about half a cycle of the commercial frequency, the phase switching work can be performed with almost no power outage.
【００１６】〔実施例２〕図４は第２の実施例の構成を
示す回路図であり、図１における第１開閉器（ＳＷ）
と並列に無接点開閉器８（ＳＣＲ）を取り付けた点の
みが第１の実施例と相違する。図５は第２の実施例の動
作を示すフローチャートであるが、第１の実施例では第
１開閉器（ＳＷ）をオフとし、電流検出手段４（ＣＴ
）に電流が流れていないことを確認してこれに引続き
無接点開閉器３（ＳＣＲ）を高速でオンとする。これ
に対して、第２の実施例では第１開閉器（ＳＷ）をオ
フとする前に無接点開閉器８（ＳＣＲ）をオンとす
る。そして無接点開閉器８（ＳＣＲ）をオフとして電
流検出手段４（ＣＴ）に電流が流れていないことを確
認したうえで、無接点開閉器３（ＳＣＲ）を高速でオ
ンとする。またもし無接点開閉器８（ＳＣＲ）をオフ
としたにもかかわらず電流検出手段４（ＣＴ）に電流
が流れている場合には、無接点開閉器８（ＳＣＲ）が
オフとなっていないため、短絡事故を防止するために第
１開閉器（ＳＷ）をオンとしたのち警報を発して動作
を停止する。その他の部分は図２と同様である。なお、
図６は第２の実施例の動作を示すタイムチャートであ
り、無接点開閉器８（ＳＣＲ）を取り付けたことによ
り停電時間ｔがより短くなったことが分かる。[Embodiment 2] FIG. 4 is a circuit diagram showing the configuration of the second embodiment, and the first switch (SW) in FIG.
The only difference from the first embodiment is that a contactless switch 8 (SCR) is attached in parallel with the above. FIG. 5 is a flow chart showing the operation of the second embodiment. In the first embodiment, the first switch (SW) is turned off and the current detection means 4 (CT).
After confirming that no current is flowing through the switch, the non-contact switch 3 (SCR) is turned on at high speed. On the other hand, in the second embodiment, the contactless switch 8 (SCR) is turned on before turning off the first switch (SW). Then, the contactless switch 8 (SCR) is turned off, and after confirming that no current is flowing through the current detecting means 4 (CT), the contactless switch 3 (SCR) is turned on at high speed. If current is flowing through the current detecting means 4 (CT) even though the contactless switch 8 (SCR) is turned off, the contactless switch 8 (SCR) is not turned off. In order to prevent a short circuit accident, the first switch (SW) is turned on, and then an alarm is issued to stop the operation. Other parts are the same as in FIG. In addition,
FIG. 6 is a time chart showing the operation of the second embodiment, and it can be seen that the power failure time t has become shorter by mounting the contactless switch 8 (SCR).
【００１７】[0017]
【発明の効果】以上に説明したように、本発明の高圧三
相配電線の相切替装置は、実質的に無停電で相の切り替
えを行うことができ、しかも各開閉器に電流検出手段を
設けて各開閉器が動作する度に電流を検出して相の切替
えを行っていくようにしたので、短絡事故等の可能性を
完全に防止することができる。よって本発明は従来の問
題点を解決した高圧三相配電線の相切替装置として、産
業の発展に寄与するところはきわめて大きいものであ
る。As described above, the phase switching device for a high-voltage three-phase distribution line of the present invention can switch phases substantially without interruption, and each switch is provided with a current detecting means. Since the current is detected and the phases are switched each time each switch operates, the possibility of a short circuit accident or the like can be completely prevented. Therefore, the present invention, as a phase switching device for a high-voltage three-phase distribution line that solves the conventional problems, has a great contribution to the industrial development.
【図１】第１の実施例の構成を示す回路図である。FIG. 1 is a circuit diagram showing a configuration of a first embodiment.
【図２】第１の実施例の装置の動作を説明するフローチ
ャートである。FIG. 2 is a flowchart illustrating the operation of the device according to the first exemplary embodiment.
【図３】第１の実施例の装置における、相切替え動作の
タイムチャートである。FIG. 3 is a time chart of a phase switching operation in the device of the first embodiment.
【図４】第２の実施例の構成を示す回路図である。FIG. 4 is a circuit diagram showing a configuration of a second exemplary embodiment.
【図５】第２の実施例の装置の動作を説明するフローチ
ャートである。FIG. 5 is a flowchart illustrating the operation of the device according to the second exemplary embodiment.
【図６】第２の実施例の装置における、相切替え動作の
タイムチャートである。FIG. 6 is a time chart of a phase switching operation in the device of the second embodiment.
【図７】先願の相切替装置の構成を示す回路図である。FIG. 7 is a circuit diagram showing a configuration of a phase switching device of the prior application.
１ 第１開閉器（ＳＷ） ２ 第２開閉器（ＳＷ） ３ 無接点開閉器（ＳＣＲ） ４ 電流検出手段（ＣＴ） ５ 電流検出手段（ＣＴ） ６ 電流検出手段（ＣＴ） ７ 制御装置 ８ 無接点開閉器（ＳＣＲ） 1 1st switch (SW) 2 2nd switch (SW) 3 Non-contact switch (SCR) 4 Current detection means (CT) 5 Current detection means (CT) 6 Current detection means (CT) 7 Control device 8 None Contact switch (SCR)
Claims (2)
第１開閉器を取り付けるとともに、前記切断点よりも負
荷側の点と接続される相との間に第１開閉器の開路に引
続き高速で閉動作を行う無接点開閉器を取り付け、さら
にこの無接点開閉器と並列にその閉動作に引続き閉動作
を行う第２開閉器を取り付けた相切替装置において、各
開閉器に電流検出手段を設けるとともに、各開閉器が動
作する度に電流を検出して相の切替えを行っていく制御
装置を設けたことを特徴とする高圧三相配電線の相切替
装置。1. A first switch is installed in parallel with a cut point of a phase to be cut of a distribution line, and an open circuit of the first switch is provided between a phase connected to a point on the load side of the cut point and a phase to be connected. In the phase switching device, a non-contact switch that continuously closes at high speed is attached to the switch, and a second switch that performs the closing operation in parallel with the non-contact switch is installed in parallel. A phase switching device for a high-voltage three-phase distribution line, characterized in that a detection device is provided, and a control device that detects a current and switches phases each time each switch operates.
付けたことを特徴とする請求項１記載の高圧三相配電線
の相切替装置。2. The phase switching device for a high voltage three-phase distribution line according to claim 1, wherein a contactless switch is attached in parallel with the first switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5061736A JP2773763B2 (en) | 1993-03-22 | 1993-03-22 | High-voltage three-phase distribution line phase switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5061736A JP2773763B2 (en) | 1993-03-22 | 1993-03-22 | High-voltage three-phase distribution line phase switching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06276686A true JPH06276686A (en) | 1994-09-30 |
| JP2773763B2 JP2773763B2 (en) | 1998-07-09 |
Family
ID=13179784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5061736A Expired - Fee Related JP2773763B2 (en) | 1993-03-22 | 1993-03-22 | High-voltage three-phase distribution line phase switching device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2773763B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011502462A (en) * | 2007-10-31 | 2011-01-20 | ケィティ、コーポレーション | Selection switch device, power supply device using the same, and switching method thereof |
| JP2015056906A (en) * | 2013-09-10 | 2015-03-23 | 三菱電機株式会社 | Load changing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4952034U (en) * | 1972-08-14 | 1974-05-08 | ||
| JPS63917A (en) * | 1986-06-18 | 1988-01-05 | 日本碍子株式会社 | Contactless switch |
| JPS648837A (en) * | 1987-06-30 | 1989-01-12 | Shin Kobe Electric Machinery | Ac no-break power unit |
-
1993
- 1993-03-22 JP JP5061736A patent/JP2773763B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4952034U (en) * | 1972-08-14 | 1974-05-08 | ||
| JPS63917A (en) * | 1986-06-18 | 1988-01-05 | 日本碍子株式会社 | Contactless switch |
| JPS648837A (en) * | 1987-06-30 | 1989-01-12 | Shin Kobe Electric Machinery | Ac no-break power unit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011502462A (en) * | 2007-10-31 | 2011-01-20 | ケィティ、コーポレーション | Selection switch device, power supply device using the same, and switching method thereof |
| US8772969B2 (en) | 2007-10-31 | 2014-07-08 | Kt Corporation | Static transfer switch device, power supply apparatus using the switch device and switching method thereof |
| JP2015056906A (en) * | 2013-09-10 | 2015-03-23 | 三菱電機株式会社 | Load changing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2773763B2 (en) | 1998-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4316005B1 (en) | AC motor drive control device | |
| JP2003333862A (en) | Power-converting device | |
| JP2004048964A (en) | Uninterruptible power supply and no-instantaneous interruption system switching device | |
| JPH06276686A (en) | Changing-over apparatus for phase of high voltage 3-phase power distribution line | |
| JP4906223B2 (en) | Method and apparatus for controlling an electrical switchgear | |
| JP2023554546A (en) | How to handle short circuit between phases | |
| CN112448372A (en) | Method for realizing metal longitudinal differential protection of parallel multi-terminal direct-current transmission system | |
| JP2648777B2 (en) | Temporary switching and restoration method of out-of-phase distribution line | |
| JP2731689B2 (en) | High-voltage three-phase distribution line phase switching device | |
| JPH1132427A (en) | Distribution system | |
| JP3327836B2 (en) | Phase switching device for distribution lines | |
| JPH03218229A (en) | Incoming line switch for underground power distribution line and switching method for uninterruptible power supply | |
| JP2002199578A (en) | Linkage protective apparatus for power system | |
| JP3879792B2 (en) | Distribution system ground fault detection device and power distribution equipment using the ground fault detection device | |
| JP2739022B2 (en) | High-voltage three-phase distribution line phase switching device | |
| JPH06165389A (en) | Three phase changeover device for three phase distribution cable | |
| JP2023074142A (en) | Transformer control device | |
| JPH0678461A (en) | Switching device of phase of high-tension three-phase distribution line | |
| JP2001231167A (en) | Method and apparatus for opening and closing capacitor equipment for three-phase alternating-current power | |
| JPH04168908A (en) | Reclosing system for current differential protection relay unit | |
| JPH0799728A (en) | Phase changeover apparatus of three-phase distribution line | |
| JPH1066260A (en) | Service and standby changeover apparatus for power system | |
| JPH0522848A (en) | Motor controller | |
| KR20040076378A (en) | Control circuit for stop of hybrid motor starter | |
| JPH06303725A (en) | Dc transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980327 |
|
| LAPS | Cancellation because of no payment of annual fees |