JPH0349531A - Switching, cutting-off and returning method for low voltage side load of transformer - Google Patents
Switching, cutting-off and returning method for low voltage side load of transformerInfo
- Publication number
- JPH0349531A JPH0349531A JP1183203A JP18320389A JPH0349531A JP H0349531 A JPH0349531 A JP H0349531A JP 1183203 A JP1183203 A JP 1183203A JP 18320389 A JP18320389 A JP 18320389A JP H0349531 A JPH0349531 A JP H0349531A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- bank
- low voltage
- switching
- automatic
- 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
- 238000000034 method Methods 0.000 title claims description 10
- 238000004891 communication Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は変圧器の低圧側負荷切替切戻方法に開するもの
である．
［従来の技術ゴ
高度情報化社会の進展に伴い、電力の安定供給に対する
要請が高まっている．そして、工事停電についても年々
困難になり、需要化を停電させることなく工事を行うこ
とが提案、実施されている．例えば、第３図に示すよう
にＡ，Ｂバンクのうち一方のＢバンクの柱上変圧器’ｆ
’ ｒ ｂの取替え工事を行う場合、Ｂバンクの負荷Ｌ
ＢをＡバンクへ切替えてＢバンクの工事中もＢバンクの
負荷Ｌ Ｆ３にＡバンクから電力を供給し、工事終了後
に負荷ＬＢをＢバンクに切戻ずようにしている。[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a method for switching and returning a load on the low voltage side of a transformer. [Conventional technology] With the development of an advanced information society, the demand for a stable supply of electricity is increasing. In addition, construction power outages are becoming more difficult year by year, and methods to carry out construction work without causing power outages to meet demand have been proposed and implemented. For example, as shown in Figure 3, the pole transformer 'f' of one of banks A and B
' r When performing b replacement work, the load L of B bank
B is switched to bank A, and even during the construction of bank B, power is supplied from bank A to the load LF3 of bank B, so that the load LB is not switched back to bank B after the construction is completed.
前記Ｂバンクの貝荷ＬＢをＡバンクへ切替える方法とし
て、Ｂバンクの低圧側に接続された低圧開閉器ＬＳに対
して、負荷側が無電圧になるとそれに対応して開閉部が
自動的（１０ｍｓｅｃ以内〉に閉じる作用を為す切替開
閉器Ｋ１を接続し、ＡＢ両バンクの分岐点に前記と同様
な梢或の切替開閉器Ｋ２を接続した後、次の操作に従い
切替えを行う方法がある．
■切替開閉器Ｋ１を手動操作によりＯＮ状態にする．■
低圧開閉器ＬＳを手動操作によりＯＦＦ状態にする．■
切替開閉器Ｋ１を手動操作によりＯＦＦ状態にする．■
切１ｆＦ開閉器Ｋ２が負荷ＬＢ側が無電圧になったこと
を検出し、瞬時（１０ｍｓｅｃ以内）にＯＮ状態となり
、負荷ＬＢ側へＡバンクから電ａ Ｉ Ａが流れるよう
になる．また、Ａバンクへ切替えられていた負荷ＬＢを
次の操作に従いＢバンクに切戻す方法がある．■切替開
閉器Ｋ２を手動操作によりＯＦＦ状態にする。■切替開
閉器Ｋ１が負荷ＬＢ（ＰＩが無電圧になったことを検出
し、瞬時（１０ｍｓｅｃ以内〉にＯＮ状態となり、負荷
ＬＢ側へＢバンクから電流ＩＢが流れるようになる．■
低圧開閉器ＬＳを手動操作によりＯＮ状態にする．■切
替開閉器Ｋｌを手動操作によりＯＦＦ状態にする．■切
替開閉器Ｋｌ，Ｋ２を取り外す．
［発明が解決しようとする課題］
ところが、前記の方法では切替開閉器Ｋ２が負荷ＬＢの
無電圧を検出して瞬時（１０ｍｓｅｃ）以内に切替える
ため瞬時停電が発生し、需要家の配電機器システム（例
えば、工場内のプロセス制御コンビュタ、サイリスタモ
ータ）に悪影響をおよぼすというおそれがある．
本発明は、前記の問題点に鑑みてなされたものであって
、その目的は瞬時停電を防止する変圧器の低圧側負荷切
替切戻方法を提供することにある。As a method of switching the shellfish cargo LB of the B bank to the A bank, when the load side becomes no voltage, the switching section automatically switches (within 10 msec) to the low voltage switch LS connected to the low voltage side of the B bank. There is a method of connecting a switching switch K1 which acts to close the bank to the bank 〉, and connecting a switching switch K2 similar to the above to the branch point of both banks A and B, and then performing the switching according to the following operation. ■Switching Turn on switch K1 by manual operation. ■
Manually turn off the low voltage switch LS. ■
Switch switch K1 is turned off by manual operation. ■
The off 1fF switch K2 detects that there is no voltage on the load LB side and instantly turns on (within 10 msec), allowing electricity to flow from bank A to the load LB side. There is also a method to switch the load LB that was switched to bank A back to bank B by following the steps below. ■Turn the switching switch K2 to the OFF state by manual operation. ■The switching switch K1 detects that the load LB (PI) has become non-voltage, turns on instantly (within 10 msec), and the current IB starts to flow from the B bank to the load LB side.■
Manually turn on the low voltage switch LS. ■Turn the switching switch Kl into the OFF state by manual operation. ■Remove switching switches Kl and K2. [Problems to be Solved by the Invention] However, in the above method, the switching switch K2 detects no voltage in the load LB and switches it within an instant (10 msec), so an instantaneous power outage occurs, and the power distribution equipment system of the customer ( For example, there is a risk that it may have an adverse effect on process control computers and thyristor motors in factories. The present invention has been made in view of the above-mentioned problems, and its object is to provide a method for switching and returning a load on the low voltage side of a transformer that prevents instantaneous power outages.
［課題を解決するための手段］
上記の目的を達成するため本願第１の発明は、両バンク
の低圧劇間を第１の開閉器を介して接続するとともに、
一方のバンクのブライマリーカットアウトに対し並列に
第２の開閉器を接続し、一方のバンクの負荷を他方のバ
ンクへ切替える際、前記第２の開閉器を投入した後一方
のバンクの１ライマリー力ットアウトを開放し、続いて
第１の開閉器を投入して前記第２の開閉器を開放するこ
とををその要旨とする。[Means for Solving the Problems] In order to achieve the above object, the first invention of the present application connects the low voltage stages of both banks via a first switch, and
When a second switch is connected in parallel to the primary cutout of one bank and the load of one bank is switched to the other bank, the first primary cutout of one bank is connected after the second switch is closed. The gist thereof is to release the power out, then turn on the first switch and open the second switch.
第２の発明は、前記第１．２の開閉器は自動開閉器であ
り、互いに送受信可能な送受信手段を設けるとともに、
同送信手段に通信線を接続して自動開閉制御することを
その要旨とする．［作用］
したがって、第１の発明の作用は、第２の開閉器を投入
し、一方のバンクの１ライマリーカットアウトを開放す
る。続いて、第１の開閉器を投入した後、第２の開閉器
を開放すると負荷の切替えが行われる。In a second invention, the switch 1.2 is an automatic switch, and is provided with a transmitting/receiving means capable of mutually transmitting and receiving,
The gist is to connect a communication line to the transmission means and automatically control opening and closing. [Operation] Therefore, the operation of the first invention is to close the second switch and open the one primary cutout of one bank. Subsequently, after the first switch is closed, the second switch is opened, and the load is switched.
第２の発明の作用は、第２の自動開閉器を自動投入し、
一方のバンクのプライマリーカットアウトを開放する．
続いて、第１の自動開閉器を投入すると送受信手段によ
り通信線を介して自動開閉制御により信号を第２の開閉
器に送信し、第２の自動開閉器を開放する．
［実施例］
以下、本発明を具体化したー実施例を図面に従って説明
する．
第１，２図に示すように、Ａ，Ｂ両バンクに設けられる
変圧器Ｔｒａ，Ｔｒｉ）の高圧側の配電線Ｌの各相Ｕ，
Ｖ，Ｗ毎にはそれぞれプライマリーカットアウトＰＣが
接続されている．また、Ａ．Ｂ両バンクの低圧側間には
バイパスケーブルＫを用いて第１の開閉器としての低圧
自動開閉器Ｓ１が接続されている。The action of the second invention is to automatically close the second automatic switch,
Open the primary cutout of one bank.
Subsequently, when the first automatic switch is turned on, the transmitting/receiving means transmits a signal to the second switch via the communication line for automatic opening/closing control, and the second automatic switch is opened. [Examples] Examples that embody the present invention will be described below with reference to the drawings. As shown in Figures 1 and 2, each phase U,
A primary cutout PC is connected to each V and W. Also, A. A low voltage automatic switch S1 as a first switch is connected between the low voltage sides of both banks B using a bypass cable K.
また、Ｂバンク側の配電線Ｉ一の各相Ｕ，Ｖ，Ｗ毎に設
けられるブライマリーカットアウトＰＣに対し並列に引
込線Ｈを用いて接続された第２の開閉器としての自動開
閉器Ｓ２が接続されている。In addition, an automatic switch S2 as a second switch is connected in parallel to the Brimary cutout PC provided for each phase U, V, and W of the distribution line I on the B bank side using a lead-in line H. is connected.
第３図に示すように、前記低圧自動開閉器Ｓ１は常時開
放型のリレー接点ＩＵ，ＩＶ，ＩＷが設けられるととも
に、前記リレー接点ＩＵ．ＩＶ，ＩＷは！！電器ＭＣに
接続され、この継電器ＭＣの制御により前記リレー接点
ＩＵ．ＩＶ，ＩＷを投入、開放するようになっている。As shown in FIG. 3, the low voltage automatic switch S1 is provided with normally open relay contacts IU, IV, and IW, and the relay contacts IU. IV, IW! ! The relay contacts IU. It is designed to insert and release IV and IW.
この継電器Ｍ Ｃは送受信手段としての制御装置２に接
続され、この制御装置２によってｉｌｌ！電器ＭＣを駆
動制御するようになっている．
前記制御装置２内には自動開閉器３１．３２の投入開放
を行なう図示しない駆動回路が設けられるとともに、開
閉器Ｓｌ．３２の投入開放信号を送信する図示しない送
受信装置が設けられている．次に、Ｂバンクのプライマ
リー力ヴトアウトＰＣに対し並列に接続された自動開閉
器Ｓ２について説明する，
なお、前記低圧自動開閉器Ｓ１と同一梢戒部分は同一符
号を付して説明を省略する．
第４図に示すように、前記低圧自動開閉器Ｓ１は常時開
放型の開閉部４Ｕ，４Ｖ，４Ｗが設けられるとともに、
前記開閉部４Ｕ，４Ｖ，４Ｗは継電器ＭＣに接続されて
いる．
さらに、両自動開閉器３１．３２に設けられた制御装置
２には通信線としての制御ｆｆｌ３がそれぞれ通信可能
にそれぞれ接続されている．さて、上記のように低圧自
動開閉器Ｓ１および自動開閉８３２を接続した状態でＢ
バンクの負荷ＬＢをＡバンクへ切替える場合について説
明する．まず、ＢバンクのプライマリーカットアウトＰ
Ｃに接続される自動開閉器Ｓ２を制御装置２により継電
器ＭＣを駆動して開閉部４Ｕ，４Ｖ，４Ｗを自動投入す
る．そして、ＢバンクのグライマリーカットアウトＰＣ
を順次に手動開放する．次に、低圧自動開閉器Ｓ１を制
御装置２により継電器ＭＣを駆動してリレー接点ＩＵ，
ＩＶ．ＩＷを自動投入する．この投入が完了すると低圧
自動開閉器Ｓ１の制御装置２は制御線３を介して自動開
閉器Ｓ２を開放ずる制ＷＪ信号を送信する。This relay MC is connected to a control device 2 as a transmitting/receiving means, and this control device 2 controls ill! It is designed to drive and control the electric appliance MC. The control device 2 is provided with a drive circuit (not shown) for closing and opening the automatic switches 31 and 32, and a drive circuit (not shown) for closing and opening the automatic switches 31 and 32. A transmitting/receiving device (not shown) for transmitting 32 input/release signals is provided. Next, the automatic switch S2 connected in parallel to the primary power outlet PC of bank B will be explained. Note that parts that are the same as the low voltage automatic switch S1 are given the same reference numerals and the explanation will be omitted. As shown in FIG. 4, the low-voltage automatic switch S1 is provided with normally open opening/closing parts 4U, 4V, and 4W, and
The opening/closing parts 4U, 4V, and 4W are connected to a relay MC. Further, a control ffl3 as a communication line is connected to the control device 2 provided in both automatic switches 31 and 32 so as to be able to communicate with each other. Now, with the low voltage automatic switch S1 and the automatic switch 832 connected as described above,
The case of switching the bank load LB to bank A will be explained. First, primary cutout P of bank B
The control device 2 drives the relay MC of the automatic switch S2 connected to the switch C to automatically close the switches 4U, 4V, and 4W. And B bank's grimy cutout PC
Manually open them one after another. Next, the control device 2 drives the relay MC of the low voltage automatic switch S1 to connect the relay contacts IU,
IV. Automatically input IW. When this closing is completed, the control device 2 of the low voltage automatic switch S1 transmits a control WJ signal via the control line 3 to open the automatic switch S2.
自動開閉器Ｓ２の制御装置２はこの制６′ＩＩ信号に基
づいてｍ電器Ｍｅを駆動して開閉部４Ｕ，４Ｖ，４Ｗを
自動開放する．
したがって、Ｂバンクの負荷ＬＢをＡバンクへ切替完了
となる．
次に、Ｂバンクの負荷ＬＢをＢバンクへ切戻す場合につ
いて説明する．
Ｂバンクの工事が終了した段階で自動開閉器Ｓ２の開閉
部４ｔＪ，４Ｖ，４Ｗを自動投入する．そして、この投
入が完了すると自動開閉器Ｓ２の制御装置２は制ｅｆＢ
線３を介して低圧自動開閉器Ｓ１へ開放制御信号を送信
する．
低圧自動開閉器Ｓｌの制御装置２はこの開放制御信号に
基づいて継電器ＭＣを駆動してリレー接点ＩＵ，ＩＶ，
ＩＷを自動開放する．そして、Ｂバンクのプライマリー
カットアウトＰＣを順次投入した後、自動開閉器Ｓ２を
開放する．この結果、Ｂバンクの負荷ＬＢをＢバンクへ
切戻し完了となる。The control device 2 of the automatic switch S2 drives the electric appliance Me based on the control 6'II signal to automatically open the switch sections 4U, 4V, and 4W. Therefore, the switching of the load LB of bank B to bank A is completed. Next, a case will be described in which the load LB of bank B is switched back to bank B. When the construction of Bank B is completed, the opening/closing parts 4tJ, 4V, and 4W of automatic switch S2 are automatically turned on. When this closing is completed, the control device 2 of the automatic switch S2 controls efB.
Send an opening control signal to the low voltage automatic switch S1 via line 3. The control device 2 of the low voltage automatic switch SL drives the relay MC based on this opening control signal to close the relay contacts IU, IV,
Automatically open IW. Then, after sequentially turning on the primary cutout PCs of bank B, the automatic switch S2 is opened. As a result, the load LB of the B bank is completely switched back to the B bank.
なお、上記の切替、切戻時間は変圧器、配電線、バイパ
スケーブルＫ、引込線ト■等の過電流強度およびＰＣヒ
ューズの溶断特性を考慮して決定することができる。Note that the above-mentioned switching and switching back times can be determined in consideration of the overcurrent strength of the transformer, distribution line, bypass cable K, drop-in line (T), etc., and the blowout characteristics of the PC fuse.
また、Ｂバンクの負荷をＡバンクに切替えのときは、低
圧自動開閉器Ｓ１が投入した後、自動開閉器Ｓ２を開放
し、切戻しのときは自動開閉器Ｓ２を投入した後、低圧
自動開閉器Ｓ１を開放するため、Ｂバンクの負荷ＬＢに
は常に電力が供給される．よって、瞬時停電が起こるこ
とはない．このように、Ｂバンクの負荷ＬＢに瞬時停電
が発生することがなくなるため、需要家の配電機器シス
テムに対し悪影響を及ぼすことはない．また、一般に変
圧器’Ｉ’ｒａ，Ｔｒｂは定格電流の２５倍の電流を２
秒間流しても異常がないように設計されているため、低
圧自動開閉器Ｓ１、自動開閉器Ｓ２、プライマリーカッ
トアウトＰＣを高速で切る必要がない．
さらに、従来とは異なり低圧分岐箱（低圧開閉器）の内
系統においても適用することができる。In addition, when switching the load of B bank to A bank, automatic switch S2 is opened after low voltage automatic switch S1 is turned on, and when switching back, automatic switch S2 is turned on and low voltage automatic switch is opened/closed. In order to open the circuit S1, power is always supplied to the load LB of bank B. Therefore, instantaneous power outages will not occur. In this way, a momentary power outage will not occur in the load LB of bank B, so there will be no adverse effect on the power distribution equipment system of the customer. In addition, transformers 'I'ra and Trb generally carry a current 25 times the rated current at 2
Since it is designed so that there is no abnormality even if it is passed for several seconds, there is no need to turn off the low voltage automatic switch S1, automatic switch S2, and primary cutout PC at high speed. Furthermore, unlike the conventional method, it can also be applied to the internal system of a low-pressure branch box (low-voltage switch).
また、本実施例においては切替、切戻作業の場合、自動
開閉器Ｓｌ，Ｓ２の開閉制御を制御線３によって行なっ
ているため、一連の作業を容易に行なうことができる．
本実施例においては、自動開閉器３１．３２を使用した
が、手動開閉器を使用して一連の切替、切戻作業を手動
操作によって行なうことも可能である．
なお、この発明は前記実施例に限定されるものではなく
、この発明の趣旨から逸脱しない範囲内で任意に変更す
ることも可能である．
［発明の効果］
以上詳述したように第１の発明によれは、第２の開閉器
を投入してプライマリーカットアウトを開放し第１の開
閉器を投入した後、第２の開閉器を開放するため、瞬時
停電がなくなり需要家の配Ｚ Ｒ器システムにｇＨ饗を
及ぼずことがなくなるという効果かある．
第２の発明によれば、第１．２の開閉器を自動開閉器に
し、これらの自動開閉制御を通信手段および通信線によ
って行なうため、負荷の切替、切戻作業が容易に行なう
ことができるという効果がある。Furthermore, in the case of switching and reverting work in this embodiment, since the opening and closing of the automatic switches Sl and S2 is controlled by the control line 3, a series of works can be easily performed. Although automatic switches 31 and 32 are used in this embodiment, it is also possible to use a manual switch to perform a series of switching and switching operations manually. It should be noted that this invention is not limited to the above-mentioned embodiments, and may be modified as desired without departing from the spirit of the invention. [Effects of the Invention] As detailed above, according to the first invention, after the second switch is turned on to open the primary cutout and the first switch is turned on, the second switch is turned on. Since the system is open, there will be no momentary power outages and there will be no GH effects on the customer's distribution system. According to the second invention, the first and second switches are automatic switches, and the automatic opening/closing control is performed by the communication means and the communication line, so that load switching and switching operations can be easily performed. There is an effect.
第１．２図は本発明を具体化したー実施例を示すもので
あって、第１図は両バンク間の低圧側に低圧開閉器を接
続し、Ｂバンクのプライマリーカットアウトに対し並列
に自動開閉器を接続した状態を示す電気回路図、第２図
は三和全部を示す配線図、第３図は従来例を示す電気回
路図である，２・・・制御手段としての制御装置、３・
・・通信線としての制御線、ＰＣ．ＰＣｔＪ，ＰＣＶ，
ＰＣＷ・・・プライマリーカットアウト、Ｓ１・・・第
１の開閉器としての低圧自動開閉器、Ｓ２・・・第２の
開閉器としての自動開閉器、Ａ，Ｂ・・・バンク、ＬＡ
，ＬＢ・・・負荷，Figure 1.2 shows an embodiment embodying the present invention, in which a low voltage switch is connected on the low voltage side between both banks, and is connected in parallel to the primary cutout of bank B. An electric circuit diagram showing a state in which an automatic switch is connected, Fig. 2 is a wiring diagram showing the entire Sanwa, and Fig. 3 is an electric circuit diagram showing a conventional example. 2... A control device as a control means; 3.
...control line as a communication line, PC. PCtJ, PCV,
PCW...Primary cutout, S1...Low voltage automatic switch as the first switch, S2...Automatic switch as the second switch, A, B...Bank, LA
, LB...Load,
Claims (1)
るとともに、一方のバンクのプライマリーカットアウト
に対し並列に第２の開閉器を接続し、一方のバンクの負
荷を他方のバンクへ切替える際、前記第２の開閉器を投
入した後一方のバンクのプライマリーカットアウトを開
放し、続いて第１の開閉器を投入して前記第２の開閉器
を開放することを特徴とする変圧器の低圧側負荷切替切
戻方法。 ２、前記第１、２の開閉器は自動開閉器であり、互いに
送受信可能な送受信手段を設けるとともに、同送信手段
に通信線を接続して自動開閉制御することを特徴とする
請求項１記載の変圧器の低圧側負荷切替切戻方法。[Claims] 1. The low voltage sides of both banks are connected via a first switch, and a second switch is connected in parallel to the primary cutout of one bank. When switching the load to the other bank, the primary cutout of one bank is opened after the second switch is closed, and then the first switch is closed and the second switch is opened. A low voltage side load switching method for a transformer, characterized in that: 2. The first and second switches are automatic switches, and are provided with transmitting/receiving means that can transmit and receive data to and from each other, and a communication line is connected to the transmitting means for automatic opening/closing control. Low voltage side load switching method for transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1183203A JP2804097B2 (en) | 1989-07-15 | 1989-07-15 | Low-side load switching system of distribution transformer between different banks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1183203A JP2804097B2 (en) | 1989-07-15 | 1989-07-15 | Low-side load switching system of distribution transformer between different banks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0349531A true JPH0349531A (en) | 1991-03-04 |
| JP2804097B2 JP2804097B2 (en) | 1998-09-24 |
Family
ID=16131579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1183203A Expired - Fee Related JP2804097B2 (en) | 1989-07-15 | 1989-07-15 | Low-side load switching system of distribution transformer between different banks |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2804097B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010181563A (en) * | 2009-02-04 | 2010-08-19 | Sony Corp | Display device, touch sensor, and method for manufacturing display device |
| JP2010273430A (en) * | 2009-05-20 | 2010-12-02 | Mitsubishi Electric Corp | Device for switching load of transformer |
| CN110739685A (en) * | 2019-10-15 | 2020-01-31 | 广州供电局有限公司 | Uninterrupted power operation method for cable type power distribution network |
-
1989
- 1989-07-15 JP JP1183203A patent/JP2804097B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010181563A (en) * | 2009-02-04 | 2010-08-19 | Sony Corp | Display device, touch sensor, and method for manufacturing display device |
| JP2010273430A (en) * | 2009-05-20 | 2010-12-02 | Mitsubishi Electric Corp | Device for switching load of transformer |
| CN110739685A (en) * | 2019-10-15 | 2020-01-31 | 广州供电局有限公司 | Uninterrupted power operation method for cable type power distribution network |
| CN110739685B (en) * | 2019-10-15 | 2021-11-02 | 广东电网有限责任公司广州供电局 | Uninterrupted power operation method for cable type power distribution network |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2804097B2 (en) | 1998-09-24 |
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