JP2007227908A - On-load tap changer - Google Patents

On-load tap changer Download PDF

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JP2007227908A
JP2007227908A JP2007015633A JP2007015633A JP2007227908A JP 2007227908 A JP2007227908 A JP 2007227908A JP 2007015633 A JP2007015633 A JP 2007015633A JP 2007015633 A JP2007015633 A JP 2007015633A JP 2007227908 A JP2007227908 A JP 2007227908A
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tap
valve
contact
resistance
main valve
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JP4664928B2 (en
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Yukinobu Takiguchi
幸延 瀧口
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Toshiba Corp
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Toshiba Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Contacts (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-load tap changer the shielding capability of which has been stabilized, which suppresses an electrode contact of a main valve from wearing out by reducing the maximum value of the shielding current at the main valve where the number of times of shielding is large. <P>SOLUTION: The changer is configured so that a main valve H opens when a resistant valve W1 on the tap side energized before change operation is closed and a resistant valve W2 on the tap side not energized before change operation is open. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、２抵抗３バルブ方式の負荷時タップ切換装置に係り、特に、真空バルブで構成した主バルブの遮断電流を低減して真空バルブの電極接点の消耗を抑えた負荷時タップ切換装置に関するものである。   The present invention relates to a two-resistor three-valve type on-load tap switching device, and more particularly to a on-load tap switching device that reduces the cut-off current of a main valve composed of a vacuum valve and suppresses the consumption of electrode contacts of the vacuum valve. Is.

一般に、送配電系統に接続される変圧器には、送配電系統の電圧を調整し安定化させるために、負荷時タップ切換装置が用いられている。負荷時タップ切換装置は切換開閉器とタップ選択器から構成されるが、切換開閉器には通常、遮断要素として真空容器内に互いに接離可能な一対の電極を配置して構成した真空バルブが使用されており、１相あたり２個の限流抵抗と３個の真空バルブを有する２抵抗３バルブ方式の切換開閉器（特許文献１参照）が提案されている。   In general, on-load tap switching devices are used for transformers connected to the power transmission and distribution system in order to adjust and stabilize the voltage of the power transmission and distribution system. The on-load tap switching device is composed of a switching switch and a tap selector. Usually, the switching switch has a vacuum valve configured by arranging a pair of electrodes that can be connected to and separated from each other in a vacuum vessel as a shut-off element. A two-resistor three-valve type switching switch (see Patent Document 1) having two current limiting resistors and three vacuum valves per phase has been proposed.

ここで、図１３および図１４を用いて、特許文献１記載の２抵抗３バルブ方式の負荷時タップ切換装置について具体的に説明する。図１３は従来の負荷時タップ切換装置における切換回路とその動作図、図１４はその切換シーケンスを示す図である。   Here, referring to FIG. 13 and FIG. 14, the on-load tap switching device of the 2-resistance 3-valve method described in Patent Document 1 will be specifically described. FIG. 13 is a diagram showing a switching circuit and its operation in a conventional on-load tap switching device, and FIG. 14 is a diagram showing its switching sequence.

図１３に示す符号のうち、ＴＷは変圧器などのタップ巻線、２、３はタップ巻線ＴＷのタップ、Ｍ１、Ｍ２はタップ２、３を選択するタップ選択器の２個の可動接触子である。Ａ、Ｃ、Ｄはそれぞれ真空バルブであって、Ａを主バルブ、Ｃ、Ｄを抵抗用バルブと呼ぶことにする。また、Ｒ１、Ｒ２は限流抵抗、ｈ１、ｈ２は切換スイッチの固定接点、ｈは固定接点ｈ１、ｈ２のうちの一方を選択する切換スイッチの可動接触子である。   13, TW is a tap winding of a transformer or the like, 2, 3 are taps of the tap winding TW, M1 and M2 are two movable contacts of a tap selector for selecting the taps 2 and 3. It is. A, C, and D are vacuum valves, respectively. A is called a main valve, and C and D are called resistance valves. R1 and R2 are current limiting resistors, h1 and h2 are fixed contacts of the changeover switch, and h is a movable contact of the changeover switch that selects one of the fixed contacts h1 and h2.

タップ巻線ＴＷのタップ２、３と中性点４との間には、可動接触子Ｍ１、限流抵抗Ｒ１、抵抗用バルブＣ、および可動接触子Ｍ２、限流抵抗Ｒ２、抵抗用バルブＤが設けられている。より詳しくは、タップ巻線ＴＷのタップ２、３の一端に可動接触子Ｍ１と限流抵抗Ｒ１と抵抗用バルブＣ、および可動接触子Ｍ２と限流抵抗Ｒ２と抵抗用バルブＤがそれぞれ直列に接続され、その他端は中性点４で接続されている。また、主バルブＡは、一端を切換スイッチの可動接触子ｈに接続され、他端を中性点４に接続されている。   Between the taps 2 and 3 of the tap winding TW and the neutral point 4, there are movable contact M1, current limiting resistor R1, resistance valve C, and movable contact M2, current limiting resistance R2, resistance valve D. Is provided. More specifically, the movable contact M1, the current limiting resistor R1, the resistance valve C, and the movable contact M2, the current limiting resistor R2, and the resistance valve D are respectively connected in series to one end of the taps 2 and 3 of the tap winding TW. The other end is connected at a neutral point 4. The main valve A has one end connected to the movable contact h of the changeover switch and the other end connected to the neutral point 4.

図１４はそれぞれの真空バルブＡ、Ｃ、Ｄ、および切換スイッチの固定接点ｈ１、ｈ２における接点の開閉状態を表しており、上段は閉極（ＯＮ）、下段は開極した非接触（ＯＦＦ）という意味である。図１３の（Ａ）〜（Ｆ）は、図１４（１）における（Ａ）〜（Ｆ）で示した切換過程を示したものである。以下、各過程を順を追って説明する。   FIG. 14 shows the open / close state of the contacts at the vacuum valves A, C and D and the fixed contacts h1 and h2 of the changeover switch. The upper stage is closed (ON), and the lower stage is non-contact (OFF). It means that. FIGS. 13A to 13F show the switching process shown in FIGS. 14A to 14F. Hereinafter, each process will be described step by step.

（Ａ）運転状態 （図１３の（Ａ））
ここでは、主バルブＡおよび抵抗用バルブＣは閉極し、抵抗用バルブＤが開極し、また、切換スイッチの可動接触子ｈは固定接点ｈ１を選択している運転状態を示す。このとき、負荷電流ＩＬは、点線のように中性点４から主バルブＡ、切換スイッチの可動接触子ｈおよび固定接点ｈ１を介して、タップ巻線ＴＷという回路に流れる。この回路は、仮にサージのような過電圧が印加されて、抵抗用バルブＤの極間で絶縁破壊したとしても、限流抵抗Ｒ２を介してタップ間で橋絡するため、タップ間を保護することができるという構成になっている。 (A) Operating state ((A) of FIG. 13)
Here, the main valve A and the resistance valve C are closed, the resistance valve D is opened, and the movable contact h of the changeover switch indicates the operation state in which the fixed contact h1 is selected. At this time, the load current IL flows from the neutral point 4 to the circuit called the tap winding TW via the main valve A, the movable contact h of the changeover switch, and the fixed contact h1 as indicated by a dotted line. In this circuit, even if an overvoltage such as a surge is applied and a dielectric breakdown occurs between the poles of the resistance valve D, a bridge is formed between the taps through the current limiting resistor R2, so that the taps are protected. It can be configured.

（Ｂ）非通電タップ側の抵抗バルブＤの閉極 (図１３の（Ｂ））
上記（Ａ）の状態から切換動作が開始すると、まず、切換動作前に通電していないタップ側の抵抗バルブＤが閉極する。つまり、３つのバルブＡ、Ｃ、Ｄは全て閉極状態となる。抵抗バルブＤの閉極により、限流抵抗Ｒ２、抵抗バルブＤ、主バルブＡを介して短絡回路が形成され、ここに循環電流ＩＣが流れる。また、負荷電流ＩＬは、前記（Ａ）の状態のままで、中性点４から主バルブＡ、切換スイッチの可動接触子ｈ、および固定接点ｈ１を介して、タップ選択器の可動接触子Ｍ１、タップ２という回路に流れる。 (B) Closing of the resistance valve D on the non-energizing tap side ((B) of FIG. 13)
When the switching operation starts from the state (A), first, the tap-side resistance valve D that is not energized before the switching operation is closed. That is, all three valves A, C, and D are closed. When the resistance valve D is closed, a short circuit is formed through the current limiting resistor R2, the resistance valve D, and the main valve A, and the circulating current IC flows there. Further, the load current IL remains in the state of (A), from the neutral point 4 through the main valve A, the movable contact h of the changeover switch, and the fixed contact h1, and the movable contact M1 of the tap selector. , Flows in a circuit called tap 2.

（Ｃ）主バルブＡの開極 (図１３の（Ｃ）)
続いて、３つのバルブＡ、Ｃ、Ｄが全て閉極となっている状態から、主バルブＡが開極し、前記（Ｂ）のように流れていた負荷電流ＩＬと循環電流ＩＣの合成値を遮断する。遮断後はタップ３の可動接触子Ｍ２、限流抵抗Ｒ２、抵抗用バルブＤ、抵抗用バルブＣ、限流抵抗Ｒ１、可動接触子Ｍ１を介して、タップ２との間で短絡回路が形成され、ここに循環電流ＩＣが流れる。 (C) Opening of main valve A ((C) in FIG. 13)
Subsequently, when all the three valves A, C, and D are closed, the main valve A is opened, and the combined value of the load current IL and the circulating current IC that flowed as in (B) above. Shut off. After the interruption, a short circuit is formed between the tap 2 and the tap 2 via the movable contact M2, the current limiting resistor R2, the resistance valve D, the resistance valve C, the current limiting resistor R1, and the movable contact M1. The circulating current IC flows here.

また、負荷電流ＩＬは中性点４から、抵抗用バルブＣおよび限流抵抗Ｒ１から成る回路と抵抗用バルブＤおよび限流抵抗Ｒ２から成る回路に、限流抵抗Ｒ１、Ｒ２の抵抗比に見合って分流する。ここではＲ１=Ｒ２とする。つまり、負荷電流ＩＬは限流抵抗Ｒ１、抵抗用バルブＣの回路と限流抵抗Ｒ２、抵抗用バルブＤの回路とでＩＬ／２が流れる。   Further, the load current IL corresponds to the resistance ratio of the current limiting resistors R1 and R2 from the neutral point 4 to the circuit consisting of the resistance valve C and the current limiting resistor R1 and the circuit consisting of the resistance valve D and the current limiting resistor R2. To divert. Here, R1 = R2. In other words, the load current IL flows through the current limiting resistor R1 and the resistor valve C circuit and the current limiting resistor R2 and the resistor valve D circuit.

（Ｄ）切換スイッチの動作 (図１３の（Ｄ）)
次に、通電していない状態の切換スイッチの可動接触子ｈが固定接点ｈ１から固定接点ｈ２に移動する。 (D) Operation of changeover switch ((D) in FIG. 13)
Next, the movable contact h of the changeover switch that is not energized moves from the fixed contact h1 to the fixed contact h2.

（Ｅ）主バルブＡの閉極 （図１３の（Ｅ））
続いて、主バルブＡが閉極する。これにより負荷電流ＩＬは中性点４から主バルブＡ、切換スイッチの可動接触子ｈ、固定接点ｈ２を介して、タップ選択器の可動接触子Ｍ２、タップ３という回路に流れる。循環電流ＩＣは前記（Ｃ）の状態のままである。 (E) Main valve A closed ((E) in FIG. 13)
Subsequently, the main valve A is closed. As a result, the load current IL flows from the neutral point 4 to the circuit of the movable contact M2 and the tap 3 of the tap selector via the main valve A, the movable contact h of the changeover switch, and the fixed contact h2. The circulating current IC remains in the state (C).

（Ｆ）通電タップ２側の抵抗用バルブＣの開極 （図１３の（Ｆ））
最後に、切換動作前に通電しているタップ２側の抵抗用バルブＣが開極することで循環電流ＩＣを遮断する。これで、切換動作を完了し、図１３（Ｆ）に示した状態で運転を継続する。なお、次のタップへの切換動作は、図１４（２）に示すように（Ｆ）から（Ａ）への順で行われる。 (F) Opening of the resistance valve C on the energizing tap 2 side ((F) in FIG. 13)
Finally, the circulating current IC is cut off by opening the resistance valve C on the tap 2 side that is energized before the switching operation. Thus, the switching operation is completed, and the operation is continued in the state shown in FIG. Note that the switching operation to the next tap is performed in the order from (F) to (A) as shown in FIG.

上述した切換回路によって切換動作を行ったときの主バルブＡ、抵抗用バルブＣ、Ｄの遮断電流の最大値はそれぞれ以下のようになる。タップ巻線ＴＷのタップ２、３間のステップ電圧をＵＳとすると、主バルブＡの遮断電流は図１３（Ｂ）で示したように負荷電流ＩＬと循環電流ＩＣの合成値となり、ＩＬ＋ＩＣ＝ＩＬ＋ＵＳ／Ｒ１である。また、抵抗用バルブＣ、Ｄの遮断電流は図１３（Ｆ）で示すように循環電流ＩＣとなり、ＩＣ＝ＵＳ／（２×Ｒ１）である。   The maximum values of the cutoff currents of the main valve A and the resistance valves C and D when the switching operation is performed by the switching circuit described above are as follows. Assuming that the step voltage between the taps 2 and 3 of the tap winding TW is US, the cutoff current of the main valve A is a composite value of the load current IL and the circulating current IC as shown in FIG. 13B, and IL + IC = IL + US / R1. Further, the cutoff currents of the resistance valves C and D become the circulating current IC as shown in FIG. 13F, and IC = US / (2 × R1).

特公昭６１−１５５６９号公報Japanese Patent Publication No. 61-15569

しかしながら、上記の従来技術では次のような問題点が指摘されていた。すなわち、図１３に示した切換回路において、抵抗用バルブＣ、Ｄの切換動作は交互である。すなわち、抵抗用バルブＣ、Ｄは切換動作２回に１回の割合で電流を遮断する。これに対して、主バルブＡは切換動作のたびに電流遮断を行うことになる。   However, the following problems have been pointed out in the above prior art. That is, in the switching circuit shown in FIG. 13, the switching operation of the resistance valves C and D is alternate. That is, the resistance valves C and D cut off the current at a rate of once every two switching operations. On the other hand, the main valve A performs current interruption every time the switching operation is performed.

したがって、単純に考えても、主バルブＡにおける切換動作の回数は、抵抗用バルブＣ、Ｄの切換動作回数の２倍である。しかも、抵抗用バルブＣ、Ｄの遮断電流は循環電流ＩＣ＝ＵＳ／（２×Ｒ１）だけであるが、主バルブＡの遮断電流は負荷電流ＩＬと循環電流ＩＣの合成値ＩＬ＋ＩＣ＝ＩＬ＋ＵＳ／Ｒ１であり、主バルブＡの方が抵抗用バルブＣ、Ｄよりも遮断電流が大きい。   Therefore, even if it thinks simply, the frequency | count of switching operation in the main valve A is twice the frequency | count of switching operation of the resistance valves C and D. Moreover, the cutoff current of the resistance valves C and D is only the circulating current IC = US / (2 × R1), but the cutoff current of the main valve A is the combined value IL + IC = IL + US / R1 of the load current IL and the circulating current IC. The main valve A has a larger cutoff current than the resistance valves C and D.

電流を遮断する真空バルブの一対の電極の対向面にそれぞれ設けたアーク接点はアークにより消耗するが、遮断回数が多いほど、あるいは電流が大きいほど、消耗度は大きいことが知られている。したがって、主バルブＡの消耗は、抵抗用バルブＣ、Ｄに比べて、はるかに進みやすいと言える。接点状態の悪化が進むと、アークが継続する長時間アークや再点弧を生じるおそれがある。すなわち、従来の負荷時タップ切換装置においては主バルブの電極接点の消耗が激しいことが問題となっていた。   The arc contacts provided on the opposing surfaces of the pair of electrodes of the vacuum valve that cut off the current are consumed by the arc, but it is known that the degree of wear increases as the number of interruptions increases or the current increases. Therefore, it can be said that the consumption of the main valve A is much easier to proceed than the resistance valves C and D. When the contact state worsens, there is a risk of arcing or re-igniting for a long time during which the arc continues. That is, in the conventional on-load tap switching device, there is a problem that the electrode contact of the main valve is consumed excessively.

本発明は、以上の問題点を解消するために提案されたものであり、その目的は、遮断回数の多い主バルブにおける遮断電流の最大値を低減することにより、主バルブにおける電極接点の消耗を抑制し、遮断能力の安定化を図った負荷時タップ切換装置を提供することにある。   The present invention has been proposed in order to solve the above problems, and its purpose is to reduce electrode contact consumption in the main valve by reducing the maximum value of the cutoff current in the main valve that is frequently shut off. An object of the present invention is to provide an on-load tap switching device that suppresses and stabilizes the shutoff capability.

本発明は、上記の目的を達成するために、タップ巻線のタップを選択するタップ選択器の２個の第１の可動接触子を設け、これら第１の可動接触子と中性点の間に、前記第１の可動接触子の各々に直列に接続された限流抵抗と抵抗用バルブをそれぞれ設置し、前記第１の可動接触子と前記限流抵抗の間にそれぞれ設けた複数の固定接点と、前記複数の固定接点のうちの一方を選択する第２の可動接触子とからなる切換スイッチと、前記切換スイッチの第２の可動接触子と中性点の間に主バルブを接続し、切換動作前に通電しているタップ側の前記抵抗用バルブが閉極、切換動作前に通電していないタップ側の前記抵抗用バルブが開極のとき、前記主バルブが開極するように構成したことを特徴としている。   In order to achieve the above object, the present invention provides two first movable contacts of a tap selector that selects a tap of a tap winding, and between these first movable contacts and a neutral point. A current limiting resistor and a resistance valve connected in series with each of the first movable contacts, and a plurality of fixed resistors respectively provided between the first movable contact and the current limiting resistor. A main switch is connected between the second movable contact of the change-over switch and a neutral point; and a change-over switch comprising a contact and a second movable contact that selects one of the plurality of fixed contacts. The main valve opens when the tap-side resistance valve that is energized before the switching operation is closed and the tap-side resistance valve that is not energized before the switching operation is open. It is characterized by the construction.

本発明では、切換動作前に通電しているタップ側の抵抗用バルブが閉極、切換動作前に通電していないタップ側の抵抗用バルブが開極という状態で、切換動作前に通電していないタップ側の抵抗用バルブが閉極するよりも先に、主バルブが開極するので、負荷電流は、閉極状態の抵抗用バルブ、限流抵抗、タップ巻線という回路に流れることになり、主バルブの遮断電流の最大値を従来よりも低く抑えることができる。   In the present invention, the tap-side resistance valve that is energized before the switching operation is closed, and the tap-side resistance valve that is not energized before the switching operation is open. Since the main valve opens before the non-tap-side resistance valve closes, the load current flows through the closed-state resistance valve, current-limiting resistance, and tap winding. The maximum value of the main valve cutoff current can be kept lower than before.

本発明の負荷時タップ切換装置によれば、切換動作前に通電しているタップ側の抵抗用バルブが閉極、切換動作前に通電していないタップ側の抵抗用バルブが開極の状態で、主バルブが開極することにより、主バルブにおける遮断電流の最大値を低減させることができ、主バルブの電極接点の消耗を抑制して遮断能力の安定化を図ることができる。   According to the on-load tap switching device of the present invention, the tap-side resistance valve that is energized before the switching operation is closed, and the tap-side resistance valve that is not energized before the switching operation is open. By opening the main valve, the maximum value of the cutoff current in the main valve can be reduced, and consumption of electrode contacts of the main valve can be suppressed to stabilize the cutoff capability.

以下、本発明に係る代表的な実施形態について、図１〜図１２を参照して、具体的に説明する。図１、図３、図５、図７、図９、図１１は、本発明に係る実施形態の切換回路図および動作図を示しており、図１３にて示した従来技術と同一部分に関しては同一符号を付して説明は省略する。また、図２、図４、図６、図８、図１０、図１２は、それぞれ図１、図３、図５、図７、図９、図１１に対応して、本発明に係る実施形態の切換シーケンスを示すものである。   Hereinafter, typical embodiments according to the present invention will be described in detail with reference to FIGS. 1, FIG. 3, FIG. 5, FIG. 7, FIG. 9 and FIG. 11 show the switching circuit diagram and the operation diagram of the embodiment according to the present invention. Regarding the same parts as the prior art shown in FIG. The same reference numerals are given and description thereof is omitted. 2, 4, 6, 8, 10, and 12 correspond to FIGS. 1, 3, 5, 7, 9, and 11, respectively. Is a switching sequence.

（１）第１の実施形態
本発明に係る第１の実施形態について、図１および図２を参照して説明する。図１は第１の実施形態である負荷時タップ切換装置の切換回路および動作図、図２はその切換シーケンスを示している。 (1) 1st Embodiment 1st Embodiment which concerns on this invention is described with reference to FIG. 1 and FIG. FIG. 1 shows a switching circuit and operation diagram of the on-load tap switching device according to the first embodiment, and FIG. 2 shows the switching sequence.

（１−１）構成
図１に示す符号Ｍ１、Ｍ２は、タップ巻線ＴＷのタップ２、３を選択するタップ選択器の２個の可動接触子、符号Ｎは中性点である。タップ２、３と中性点Ｎの間には、可動接触子Ｍ１、Ｍ２それぞれに限流抵抗Ｒ１と抵抗用バルブＷ１、および限流抵抗Ｒ２と抵抗バルブＷ２が直列に接続され、その一端は中性点Ｎで接続されている。 (1-1) Configuration Symbols M1 and M2 shown in FIG. 1 are two movable contacts of a tap selector that selects the taps 2 and 3 of the tap winding TW, and symbol N is a neutral point. Between the taps 2 and 3 and the neutral point N, a current limiting resistor R1 and a resistance valve W1 and a current limiting resistor R2 and a resistance valve W2 are connected in series to the movable contacts M1 and M2, respectively. Connected at neutral point N.

また、可動接触子Ｍ１と限流抵抗Ｒ１の中間部には切換スイッチＳの固定接点ＳＡが設けられ、また可動接触子Ｍ２と限流抵抗Ｒ２の中間部には切換スイッチＳの固定接点ＳＢが設けられている。これら固定接点ＳＡ、ＳＢに近接して、固定接点ＳＡ、ＳＢのいずれか一方を選択する切換スイッチＳの可動接触子ＳＣが設置されており、これら固定接点ＳＡ、ＳＢおよび可動接触子ＳＣから切換スイッチＳが構成される。さらに、切換スイッチＳの可動接触子ＳＣと中性点Ｎの間には主バルブＨが接続されている。   Further, a fixed contact SA of the changeover switch S is provided at an intermediate portion between the movable contact M1 and the current limiting resistor R1, and a fixed contact SB of the changeover switch S is provided at an intermediate portion between the movable contact M2 and the current limiting resistance R2. Is provided. A movable contact SC of a changeover switch S for selecting one of the fixed contacts SA and SB is installed in the vicinity of the fixed contacts SA and SB, and switching is performed from the fixed contacts SA and SB and the movable contact SC. A switch S is configured. Further, a main valve H is connected between the movable contact SC of the changeover switch S and the neutral point N.

本実施形態の構成の特徴は、次の点である。まず、タップ２側で通電している場合を例にとって説明する。切換動作前に通電しているタップ２側の抵抗用バルブＷ１が閉極、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が開極の状態で、主バルブＨが開極するようになっている。   The features of the configuration of the present embodiment are as follows. First, a case where power is supplied on the tap 2 side will be described as an example. The main valve H is opened while the tap-side resistance valve W1 energized before the switching operation is closed, and the tap-side resistance valve W2 not energized before the switching operation is open. It is like that.

そして、主バルブＨが開極し、且つ切換動作前に通電しているタップ２側の抵抗用バルブＷ１が閉極、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が開極の状態で、切換スイッチＳの可動接触子ＳＣが動作を開始して、切換動作前に接触していた固定接点ＳＡとの電気的接続が開離される。その後、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が閉極するように構成している。   Then, the main valve H is opened, the resistance valve W1 on the tap 2 side that is energized before the switching operation is closed, and the resistance valve W2 on the tap 3 side that is not energized before the switching operation is opened. In this state, the movable contact SC of the changeover switch S starts operating, and the electrical connection with the fixed contact SA that was in contact before the changeover operation is released. Thereafter, the resistance valve W2 on the side of the tap 3 that is not energized before the switching operation is configured to be closed.

（１−２）切換シーケンス
以上の特徴について、図１の（Ａ）〜（Ｆ）で示した切換過程に従い、順を追って説明する。図１の（Ａ）〜（Ｆ）は図２（１）に（Ａ）〜（Ｆ）で示した切換過程を示したものである。 (1-2) Switching Sequence The above features will be described step by step according to the switching process shown in FIGS. FIGS. 1A to 1F show the switching process shown in FIGS. 2A to 2F by (A) to (F).

（Ａ）運転状態 （図１の（Ａ））
主バルブＨおよび抵抗用バルブＷ１は閉極（ＯＮ）し、切換スイッチＳの可動接触子ＳＣが固定接点ＳＡに接続され、タップ選択器の可動接触子Ｍ１がタップ巻線ＴＷに接続された運転状態を示す。このとき、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＡ、タップ巻線ＴＷという回路に流れる。 (A) Operating state ((A) in FIG. 1)
The main valve H and the resistance valve W1 are closed (ON), the movable contact SC of the changeover switch S is connected to the fixed contact SA, and the movable contact M1 of the tap selector is connected to the tap winding TW. Indicates the state. At this time, the load current IL flows from the neutral point N to the circuit of the main valve H, the movable contact SC of the changeover switch S, the fixed contact SA, and the tap winding TW as indicated by a dotted line.

（Ｂ）主バルブＨの開極 （図１の（Ｂ））
上記（Ａ）の状態から切換動作が開始すると、従来ではまず非通電タップ側の抵抗用バルブが閉極したが（図１３の（Ｂ）の状態）、本実施形態ではまず主バルブＨが開くことになる。これにより、負荷電流ＩＬは、図１の（Ｂ）における点線のように中性点Ｎから抵抗用バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れる。 (B) Opening of main valve H ((B) in FIG. 1)
When the switching operation starts from the state (A), the resistance valve on the non-energizing tap side is first closed (state (B) in FIG. 13), but the main valve H is first opened in this embodiment. It will be. As a result, the load current IL flows from the neutral point N to the circuit of the resistance valve W1, the current limiting resistor R1, and the tap winding TW as indicated by the dotted line in FIG.

（Ｃ）非通電タップ３側の抵抗用バルブＷ２の閉極 （図１の（Ｃ））
続いて、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が閉極し、限流抵抗Ｒ２、抵抗用バルブＷ２、および抵抗用バルブＷ１、限流抵抗Ｒ１を介して、短絡回路が形成され、ここに循環電流ＩＣが流れる。 (C) Closing of the resistance valve W2 on the non-energizing tap 3 side ((C) in FIG. 1)
Subsequently, the resistance valve W2 on the side of the tap 3 that is not energized before the switching operation is closed, and a short circuit is established via the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1. Is formed, and the circulating current IC flows there.

また、負荷電流ＩＬは中性点Ｎから、抵抗用バルブＷ１、限流抵抗Ｒ１の回路と抵抗用バルブＷ２、限流抵抗Ｒ２の回路に、限流抵抗Ｒ１、Ｒ２の抵抗比に見合って分流する。ここではＲ１=Ｒ２とする。つまり、図１の（Ｄ）のように負荷電流ＩＬは中性点Ｎから抵抗用バルブＷ１、限流抵抗Ｒ１の回路と抵抗用バルブＷ２、限流抵抗Ｒ２の回路とに２分して流れることになる。   Further, the load current IL is divided from the neutral point N to the circuit of the resistance valve W1 and the current limiting resistor R1 and the circuit of the resistance valve W2 and the current limiting resistor R2 in accordance with the resistance ratio of the current limiting resistors R1 and R2. To do. Here, R1 = R2. That is, as shown in FIG. 1D, the load current IL flows from the neutral point N to the resistance valve W1 and the current limiting resistor R1 circuit and the resistance valve W2 and the current limiting resistance R2 circuit in two. It will be.

（Ｄ）切換スイッチＳの動作 （図１の（Ｄ））
次に、切換スイッチＳの可動接触子ＳＣが、可動接触子Ｍ１側の固定接点ＳＡから可動接触子Ｍ２側の固定接点ＳＢへと移動を開始する。 (D) Operation of changeover switch S ((D) of FIG. 1)
Next, the movable contact SC of the changeover switch S starts to move from the fixed contact SA on the movable contact M1 side to the fixed contact SB on the movable contact M2 side.

（Ｅ）主バルブＨの閉極 （図１の（Ｅ））
さらに、切換スイッチＳの可動接触子ＳＣが固定接点ＳＢに接触し、主バルブＨが閉極する。循環電流ＩＣは点線のように図１（Ｃ）の状態のまま、限流抵抗Ｒ２、抵抗用バルブＷ２、抵抗用バルブＷ１、限流抵抗Ｒ１を介して流れる。負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＢを経て、タップ選択器の可動接触子Ｍ２からタップ３、タップ巻線ＴＷという回路に移る。 (E) Closure of main valve H ((E) in Fig. 1)
Further, the movable contact SC of the changeover switch S comes into contact with the fixed contact SB, and the main valve H is closed. The circulating current IC flows through the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1 in the state of FIG. As shown by the dotted line, the load current IL passes from the neutral point N to the main valve H, the movable contact SC of the changeover switch S, and the fixed contact SB, and from the movable contact M2 of the tap selector to the tap 3 and the tap winding TW. Move on to the circuit.

（Ｆ）通電タップ２側の抵抗用バルブＷ１の開極 （図１の（Ｆ））
最後に、切換動作前に通電しているタップ２側の抵抗用バルブＷ１が開極し、循環電流ＩＣを遮断する。これで、切換動作を完了し、図１（Ｆ）の状態で運転を継続する。また、次のタップへの切換動作は図２（２）に示す（Ｆ）から（Ａ）への順で行われる。 (F) Opening of the resistance valve W1 on the energizing tap 2 side ((F) in FIG. 1)
Finally, the resistance valve W1 on the tap 2 side that is energized before the switching operation is opened to interrupt the circulating current IC. Thus, the switching operation is completed, and the operation is continued in the state of FIG. The switching operation to the next tap is performed in the order from (F) to (A) shown in FIG.

（１−３）作用効果
以上のような切換シーケンスを有する第１の実施形態の作用効果は次の通りである。すなわち、切換動作前に通電タップ２側の抵抗用バルブＷ１が閉極、切換動作前に非通電タップ３側の抵抗用バルブＷ２が開極という状態で、非通電タップ３側の抵抗用バルブＷ２が閉極するよりも前に、主バルブＨが開極するので、負荷電流は、閉極状態の抵抗用バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れることになる。 (1-3) Operational Effects The operational effects of the first embodiment having the switching sequence as described above are as follows. That is, the resistance valve W1 on the non-energizing tap 3 side is closed in a state where the resistance valve W1 on the energizing tap 2 side is closed before the switching operation and the resistance valve W2 on the non-energizing tap 3 side is opened before the switching operation. Since the main valve H is opened before the terminal is closed, the load current flows through a circuit of the resistance valve W1, the current limiting resistor R1, and the tap winding TW in the closed state.

したがって、主バルブＨの遮断電流の最大値は、主バルブＨは負荷電流ＩＬ、抵抗用バルブＷ１はＵＳ／（２×Ｒ１）となる。つまり、従来の切換開閉器における主バルブＡの遮断電流の最大値がＩＬ＋ＵＳ／Ｒ１であることに比べて、本実施形態では主バルブＨの遮断電流の最大値を小さく抑えることができる。   Therefore, the maximum value of the cutoff current of the main valve H is the load current IL for the main valve H and US / (2 × R1) for the resistance valve W1. That is, in the present embodiment, the maximum value of the cutoff current of the main valve H can be suppressed smaller than the maximum value of the cutoff current of the main valve A in the conventional switching switch is IL + US / R1.

これにより、主バルブＨの電極接点の消耗を抑制することができ、切換開閉器を構成する真空バルブは安定した遮断能力を発揮することができる。また、図１（Ｃ）の状態において、主バルブＨの遮断失敗が生じた場合でも、切換スイッチＳにより強制的に回路を開くことができる。このため、切換スイッチＳによる確実な電流遮断が可能となり、信頼性の向上を図ることができる。   Thereby, the consumption of the electrode contacts of the main valve H can be suppressed, and the vacuum valve constituting the switching switch can exhibit a stable shut-off capability. In the state shown in FIG. 1C, the circuit can be forcibly opened by the changeover switch S even when the main valve H fails to be shut off. For this reason, the current can be reliably interrupted by the changeover switch S, and the reliability can be improved.

（２）第２の実施形態
本発明に係る第２の実施形態について、図３および図４を参照して説明する。
（２−１）構成
第２の実施形態の回路構成については、上記第１の実施形態と同様であるが、切換シーケンスを異にしている。第２の実施形態では、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が閉極し、切換動作前に通電しているタップ２側の抵抗用バルブＷ１が開極し、その後、主バルブＨが閉極するように切換シーケンスを構成したことに特徴がある。 (2) Second Embodiment A second embodiment according to the present invention will be described with reference to FIGS.
(2-1) Configuration The circuit configuration of the second embodiment is the same as that of the first embodiment, but the switching sequence is different. In the second embodiment, the tap-side resistance valve W2 that is not energized before the switching operation is closed, the tap-side resistance valve W1 that is energized before the switching operation is opened, and then The switching sequence is configured so that the main valve H is closed.

（２−２）切換シーケンス
以上の特徴について、図３の（Ａ）〜（Ｆ）で示した切換過程に従い、順を追って説明する。図３の（Ａ）〜（Ｆ）は図４（１）に（Ａ）〜（Ｆ）で示した切換過程を示したものである。 (2-2) Switching Sequence The above features will be described step by step according to the switching process shown in (A) to (F) of FIG. FIGS. 3A to 3F show the switching process shown in FIGS. 4A to 4F by (A) to (F).

第２の実施形態における切換シーケンスでは、上記第１の実施形態における（Ａ）運転状態から（Ｄ）切換スイッチの動作までの流れは同様であり、上記第１の実施形態における（Ｅ）主バルブＨの閉極と、（Ｆ）通電タップ２側の抵抗用バルブＷ１の開極とを入れ替えたものと言える。すなわち、次のような切換シーケンスとなる。   In the switching sequence in the second embodiment, the flow from (A) the operating state to the operation of the (D) switch in the first embodiment is the same, and (E) the main valve in the first embodiment. It can be said that the H closing and (F) the opening of the resistance valve W1 on the energizing tap 2 side are interchanged. That is, the switching sequence is as follows.

（Ａ）運転状態 （図３の（Ａ））
主バルブＨおよび抵抗用バルブＷ１は閉極し、切換スイッチＳの可動接触子ＳＣが固定接点ＳＡに接続され、タップ選択器の可動接触子Ｍ１がタップ巻線ＴＷのタップ２に接続されている。このとき、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＡ、可動接触子Ｍ１、タップ２、タップ巻線ＴＷという回路に流れる。 (A) Operation state ((A) in FIG. 3)
The main valve H and the resistance valve W1 are closed, the movable contact SC of the changeover switch S is connected to the fixed contact SA, and the movable contact M1 of the tap selector is connected to the tap 2 of the tap winding TW. . At this time, the load current IL flows from the neutral point N to a circuit of the main valve H, the movable contact SC of the changeover switch S, the fixed contact SA, the movable contact M1, the tap 2, and the tap winding TW as indicated by a dotted line. .

（Ｂ）主バルブＨの開極 （図３の（Ｂ））
上記（Ａ）の状態から切換動作が開始すると、本実施形態ではまず主バルブＨが開くことになる。これにより、負荷電流ＩＬは、点線のように抵抗用バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れる。 (B) Opening of main valve H ((B) of FIG. 3)
When the switching operation starts from the state (A), the main valve H is first opened in the present embodiment. As a result, the load current IL flows through a circuit including the resistance valve W1, the current limiting resistor R1, and the tap winding TW as indicated by a dotted line.

（Ｃ）非通電タップ３側の抵抗用バルブＷ２の閉極 （図３の（Ｃ））
続いて、切換動作前に通電していないタップ２側の抵抗用バルブＷ２が閉極し、限流抵抗Ｒ２、抵抗用バルブＷ２、抵抗用バルブＷ１、限流抵抗Ｒ１を介して、短絡回路が形成され、ここに循環電流ＩＣが流れる。 (C) Closing of the resistance valve W2 on the non-energizing tap 3 side ((C) in FIG. 3)
Subsequently, the resistance valve W2 on the side of the tap 2 that is not energized before the switching operation is closed, and a short circuit is connected via the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1. The circulating current IC flows therethrough.

また、負荷電流ＩＬは中性点Ｎから、抵抗用バルブＷ１および限流抵抗Ｒ１から成る回路と、抵抗用バルブＷ２および限流抵抗Ｒ２から成る回路に、限流抵抗Ｒ１、Ｒ２の抵抗比に見合って分流する。ここではＲ１=Ｒ２とする。つまり、負荷電流ＩＬは抵抗用バルブＷ１、限流抵抗Ｒ１の回路と抵抗用バルブＷ２、限流抵抗Ｒ２の回路とで２分して流れることになる。   Further, the load current IL is changed from the neutral point N to the circuit composed of the resistance valve W1 and the current limiting resistor R1, and the circuit composed of the resistance valve W2 and the current limiting resistor R2, with the resistance ratio of the current limiting resistors R1 and R2. Divide it accordingly. Here, R1 = R2. That is, the load current IL flows in half by the circuit of the resistance valve W1 and the current limiting resistor R1 and the circuit of the resistance valve W2 and the current limiting resistor R2.

（Ｄ）切換スイッチＳの動作 （図３の（Ｄ））
次に、切換スイッチＳの可動接触子ＳＣが固定接点ＳＡから固定接点ＳＢ側へと移動を開始する。 (D) Operation of changeover switch S ((D) of FIG. 3)
Next, the movable contact SC of the changeover switch S starts to move from the fixed contact SA to the fixed contact SB side.

（Ｅ）通電タップ側の抵抗用バルブＷ１の開極 （図３の（Ｅ））
切換スイッチＳの可動接触子ＳＣが固定接点ＳＡから固定接点ＳＢへと移動した後、切換動作前に通電しているタップ２側の抵抗用バルブＷ１が開極し、循環電流ＩＣを遮断する。この時、負荷電流ＩＬは、点線のように抵抗用バルブＷ２、限流抵抗Ｒ２、タップ巻線ＴＷという回路に流れる。 (E) Opening of the resistance valve W1 on the energizing tap side ((E) in FIG. 3)
After the movable contact SC of the changeover switch S moves from the fixed contact SA to the fixed contact SB, the tap-side resistance valve W1 that is energized before the changeover operation is opened to interrupt the circulating current IC. At this time, the load current IL flows through a circuit including a resistance valve W2, a current limiting resistor R2, and a tap winding TW as indicated by a dotted line.

（Ｆ）主バルブＨの閉極 （図３の（Ｆ））
最後に、主バルブＨが閉極し、負荷電流ＩＬを中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＢ、タップ巻線ＴＷという回路に移す。これで、切換動作を完了し、図示の状態で運転を継続する。また、次のタップへの切換動作は図４（２）に示す（Ｆ）から（Ａ）への順で行われる。 (F) Main valve H closed ((F) in FIG. 3)
Finally, the main valve H is closed, and the load current IL is transferred from the neutral point N to the main valve H, the movable contact SC of the changeover switch S, the fixed contact SB, and the tap winding TW. Thus, the switching operation is completed and the operation is continued in the state shown in the drawing. The switching operation to the next tap is performed in the order from (F) to (A) shown in FIG.

（２−３）作用効果
以上のような切換シーケンスを有する第２の実施形態は、上記第１の実施形態に持つ作用効果（主バルブＨの電極接点の消耗抑制と切換スイッチＳによる確実な電流遮断）に加えて、次のような独自の作用効果がある。 (2-3) Operational Effect The second embodiment having the switching sequence as described above has the operational effect of the first embodiment (suppression of consumption of electrode contacts of the main valve H and reliable current by the changeover switch S). In addition to blocking, it has the following unique effects.

すなわち、上述したシーケンスをとることにより、次のタップへの切換動作である図４（２）の（Ｆ）から（Ａ）の各バルブの動作順序を、前タップの切換動作を逆に動作させたとき（図４（１）の（Ｆ）から（Ａ））と同じにすることができる。このため、主バルブＨおよび抵抗用バルブＷ１、Ｗ２を構成する真空バルブの開閉駆動機構を、同軸で往復運動が可能な構成とすることができる。これにより、特殊な駆動機構部を必要とせず、また、切換方向によらない安定した真空バルブの開閉駆動機構を得ることができ、機構の簡略化と動作の信頼性向上が実現する。   That is, by taking the above-described sequence, the operation sequence of the valves (F) to (A) in FIG. 4 (2), which is the switching operation to the next tap, is reversed from the switching operation of the previous tap. ((F) to (A) in FIG. 4 (1)). For this reason, the open / close drive mechanism of the vacuum valve constituting the main valve H and the resistance valves W1, W2 can be configured to be coaxial and capable of reciprocating. As a result, a special drive mechanism section is not required, and a stable vacuum valve opening / closing drive mechanism that does not depend on the switching direction can be obtained, and the mechanism is simplified and the operation reliability is improved.

（３）第３の実施形態
本発明に係る第３の実施形態について、図５および図６を参照して説明する。
（３−１）構成
第３の実施形態の回路構成については、上記第１の実施形態と同様であるが、切換シーケンスにおける切換スイッチＳの切り離し動作を、非通電タップ３側の抵抗用バルブＷ２の閉極動作よりも、先に行う点にある。 (3) Third Embodiment A third embodiment according to the present invention will be described with reference to FIGS.
(3-1) Configuration The circuit configuration of the third embodiment is the same as that of the first embodiment, but the disconnecting operation of the changeover switch S in the switching sequence is performed by the resistance valve W2 on the non-energizing tap 3 side. This is the point that is performed before the closing operation.

すなわち、主バルブＨが開極し、且つ切換動作前に通電しているタップ２側の抵抗用バルブＷ１が閉極、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が開極の状態で、切換スイッチＳの可動接触子ＳＣが動作を開始して、切換動作前に接触していた固定接点ＳＡとの電気的接続を開離する。   That is, the main valve H is opened, the resistance valve W1 on the tap 2 side that is energized before the switching operation is closed, and the resistance valve W2 on the tap 3 side that is not energized before the switching operation is opened. In this state, the movable contact SC of the changeover switch S starts operating, and the electrical connection with the fixed contact SA that was in contact before the changeover operation is released.

これに続いて、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が閉極し、次いで、切換動作前に通電しているタップ２側の抵抗用バルブＷ１が開極し、最後に、主バルブＨが閉極するようになっている。   Subsequently, the tap-side resistance valve W2 that is not energized before the switching operation is closed, and then the tap-side resistance valve W1 that is energized before the switching operation is opened. In addition, the main valve H is closed.

（３−２）切換シーケンス
つまり、第３の実施形態における切換シーケンスでは、上記第１の実施形態における（Ｃ）非通電タップ３側の抵抗用バルブＷ２の閉極と、（Ｄ）切換スイッチＳの動作とを入れ替えたものであり、上記第１の実施形態における（Ａ）、（Ｂ）、（Ｅ）、（Ｆ）に関しては同様である。すなわち、次のような切換シーケンスとなる。 (3-2) Switching Sequence That is, in the switching sequence in the third embodiment, (C) the closing of the resistance valve W2 on the non-energizing tap 3 side in the first embodiment, and (D) the switching switch S. This is the same as (A), (B), (E), and (F) in the first embodiment. That is, the switching sequence is as follows.

（Ａ）運転状態 （図５の（Ａ））
主バルブＨおよび抵抗用バルブＷ１は閉極し、切換スイッチＳの可動接触子ＳＣが固定接点ＳＡに接続され、タップ選択器の可動接触子Ｍ１がタップ巻線ＴＷに接続された運転状態を示す。このとき、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＡ、タップ巻線ＴＷという回路に流れる。 (A) Operating state ((A) of FIG. 5)
The main valve H and the resistance valve W1 are closed, and the operation state in which the movable contact SC of the changeover switch S is connected to the fixed contact SA and the movable contact M1 of the tap selector is connected to the tap winding TW is shown. . At this time, the load current IL flows from the neutral point N to the circuit of the main valve H, the movable contact SC of the changeover switch S, the fixed contact SA, and the tap winding TW as indicated by a dotted line.

（Ｂ）主バルブＨの開極 （図５の（Ｂ））
上記（Ａ）の状態から切換動作が開始すると、本実施形態ではまず主バルブＨが開くことになる。これにより、負荷電流ＩＬは、点線のように抵抗用バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れる。 (B) Opening of main valve H ((B) of FIG. 5)
When the switching operation starts from the state (A), the main valve H is first opened in the present embodiment. As a result, the load current IL flows through a circuit including the resistance valve W1, the current limiting resistor R1, and the tap winding TW as indicated by a dotted line.

（Ｃ）切換スイッチＳの動作 （図５の（Ｃ））
主バルブＨが開極した後、切換スイッチの可動接触子ＳＣが固定接点ＳＡから固定接点ＳＢへと移動する。 (C) Operation of changeover switch S ((C) of FIG. 5)
After the main valve H is opened, the movable contact SC of the changeover switch moves from the fixed contact SA to the fixed contact SB.

（Ｄ）非通電タップ側の抵抗用バルブＷ２の閉極 （図５の（Ｄ））
続いて、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が閉極し、限流抵抗Ｒ２、抵抗用バルブＷ２、抵抗用バルブＷ１、限流抵抗Ｒ１を介して、短絡回路が形成され、循環電流ＩＣが流れる。 (D) Closing of resistance valve W2 on the non-energizing tap side ((D) in FIG. 5)
Subsequently, the resistance valve W2 on the side of the tap 3 that is not energized before the switching operation is closed, and a short circuit is connected via the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1. Is formed, and the circulating current IC flows.

（Ｅ）主バルブＨの閉極 （図５の（Ｅ））
さらに、切換スイッチＳの可動接触子ＳＣが固定接点ＳＢに接触し、主バルブＨが閉極する。循環電流ＩＣは点線のように図５（Ｄ）の状態のまま、限流抵抗Ｒ２、抵抗用バルブＷ２、抵抗用バルブＷ１、限流抵抗Ｒ１を介して流れる。負荷電流ＩＬは、点線のように主バルブＨ、切換スイッチＳ、可動接触子Ｍ２、タップ３、タップ巻線ＴＷという回路に移る。 (E) Main valve H closed ((E) in FIG. 5)
Further, the movable contact SC of the changeover switch S comes into contact with the fixed contact SB, and the main valve H is closed. The circulating current IC flows through the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1 while maintaining the state of FIG. The load current IL moves to a circuit including a main valve H, a changeover switch S, a movable contact M2, a tap 3, and a tap winding TW as indicated by a dotted line.

（Ｆ）通電タップ側の抵抗用バルブＷ１の開極
最後に、切換動作前に通電しているタップ側の抵抗用バルブＷ１が開極し、循環電流ＩＣを遮断する。これで、切換動作を完了し、図５（Ｆ）の状態で運転を継続する。また、次のタップへの切換動作は図６（２）に示す（Ｆ）から（Ａ）への順で行われる。 (F) Opening of the resistance valve W1 on the energizing tap side Finally, the tap-side resistance valve W1 energized before the switching operation is opened to interrupt the circulating current IC. Thus, the switching operation is completed, and the operation is continued in the state of FIG. Further, the switching operation to the next tap is performed in the order from (F) to (A) shown in FIG.

（３−３）作用効果
以上のような切換シーケンスを有する第３の実施形態は、上記第１の実施形態に持つ作用効果、つまり主バルブＨの電極接点の消耗抑制と切換スイッチＳによる確実な電流遮断に加えて、次のような作用効果がある。 (3-3) Operational Effect The third embodiment having the switching sequence as described above has the operational effect of the first embodiment, that is, the suppression of consumption of electrode contacts of the main valve H and the reliable switching switch S. In addition to current interruption, there are the following effects.

すなわち、図５（Ｃ）の状態においては、抵抗用バルブＷ１、Ｗ２を閉極し、限流抵抗Ｒ１、Ｒ２を介してタップ２，３間で短絡回路を作る前に、切換スイッチＳの切り離し動作を開始させるので、主バルブＨの開極時に電極接点損傷等による遮断失敗が生じた場合でも、図５（Ｃ）の状態で切換スイッチＳにより負荷電流ＩＬのみを遮断することができる。この際、循環電流ＩＣが重畳していないので、切換スイッチＳでの遮断電流の最大値を抑えることが可能となる。これにより、切換スイッチＳの電極接点をコンパクトにすることができるといったメリットがある。   That is, in the state of FIG. 5C, the resistance valves W1 and W2 are closed and the changeover switch S is disconnected before creating a short circuit between the taps 2 and 3 via the current limiting resistors R1 and R2. Since the operation is started, only the load current IL can be cut off by the changeover switch S in the state shown in FIG. 5C even when a cutoff failure occurs due to electrode contact damage or the like when the main valve H is opened. At this time, since the circulating current IC is not superimposed, the maximum value of the cutoff current at the changeover switch S can be suppressed. Thereby, there exists an advantage that the electrode contact of the changeover switch S can be made compact.

（４）第４の実施形態
本発明に係る第４の実施形態について、図７および図８を参照して説明する。
（４−１）構成
第４の実施形態では、中性点Ｎに対して通電接触子Ｃ１、Ｃ２が接続されている。また、可動接触子Ｍ１と限流抵抗Ｒ１の間には通電接点固定接点ＣＡが設けられ、可動接触子Ｍ２と限流抵抗Ｒ２の間には通電接点固定接点ＣＢが設けられている。通電接触子Ｃ１は通電接点固定接点ＣＡと中性点Ｎとを接続、開離を可能にした接触子であり、通電接触子Ｃ２は通電接点固定接点ＣＢと中性点Ｎとを接続、開離を可能にした接触子である。 (4) Fourth Embodiment A fourth embodiment according to the present invention will be described with reference to FIGS.
(4-1) Configuration In the fourth embodiment, the current-carrying contacts C1 and C2 are connected to the neutral point N. An energizing contact fixed contact CA is provided between the movable contact M1 and the current limiting resistor R1, and an energized contact fixed contact CB is provided between the movable contact M2 and the current limiting resistor R2. The energizing contact C1 is a contact that connects and disconnects the energizing contact fixed contact CA and the neutral point N, and the energizing contact C2 connects and opens the energized contact fixed contact CB and the neutral point N. It is a contactor that can be separated.

（４−２）切換シーケンス
以上の特徴について、図７の（Ａ）〜（Ｈ）で示した切換過程に従い、順を追って説明する。図７の（Ａ）〜（Ｈ）は図８（１）に（Ａ）〜（Ｈ）で示した切換過程を示したものである。 (4-2) Switching Sequence The above features will be described step by step in accordance with the switching process shown in FIGS. FIGS. 7A to 7H show the switching process shown in FIGS. 8A to 8H.

（Ａ）運転状態 （図７の（Ａ））
主バルブＨおよび抵抗用バルブＷ１は閉極し、切換スイッチＳの可動接触子ＳＣが固定接点ＳＡに接続され、通電接触子Ｃ１が通電接点固定接点ＣＡに接続され、タップ選択器の可動接触子Ｍ１がタップ巻線ＴＷのタップ２に接続された運転状態を示している。この時、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＡ、タップ巻線ＴＷという回路と、中性点Ｎから通電接触子Ｃ１、接点ＣＡ、タップ巻線ＴＷという回路に分流する。 (A) Operating state ((A) in FIG. 7)
The main valve H and the resistance valve W1 are closed, the movable contact SC of the changeover switch S is connected to the fixed contact SA, the energizing contact C1 is connected to the energizing contact fixed contact CA, and the movable contact of the tap selector. M1 has shown the driving | running state connected to the tap 2 of tap winding TW. At this time, the load current IL is a circuit from the neutral point N to the main valve H, the movable contact SC of the changeover switch S, the fixed contact SA, the tap winding TW, and the neutral point N to the energized contact as shown by the dotted line. The current is diverted to a circuit of C1, contact CA, and tap winding TW.

（Ｂ）通電接触子Ｃ１の開離 （図７の（Ｂ））
上記（Ａ）の状態から切換動作が開始すると、まず通電接触子Ｃ１が接点ＣＡから開離する。負荷電流ＩＬは点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＡ、タップ巻線ＴＷという回路に流れる。 (B) Separation of energizing contact C1 ((B) of FIG. 7)
When the switching operation starts from the state (A), the energizing contact C1 is first separated from the contact CA. The load current IL flows from the neutral point N to the circuit of the main valve H, the movable contact SC of the changeover switch S, the fixed contact SA, and the tap winding TW as indicated by the dotted line.

（Ｃ）主バルブＨの開極 （図７の（Ｃ））
続いて、主バルブＨが開く。負荷電流ＩＬは、点線のように抵抗用バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れる。 (C) Opening of main valve H ((C) in FIG. 7)
Subsequently, the main valve H is opened. The load current IL flows through a circuit including a resistance valve W1, a current limiting resistor R1, and a tap winding TW as indicated by a dotted line.

（Ｄ）非通電タップ３側の抵抗用バルブＷ２の閉極 （図７の（Ｄ））
次に、切換動作前に通電していないタップ３側の抵抗用バルブＷ２が閉極し、限流抵抗Ｒ２、抵抗用バルブＷ２、抵抗用バルブＷ１、限流抵抗Ｒ１を介して、短絡回路が形成され、循環電流ＩＣが流れる。 (D) Closing of the resistance valve W2 on the non-energizing tap 3 side ((D) of FIG. 7)
Next, the resistance valve W2 on the side of the tap 3 that is not energized before the switching operation is closed, and a short circuit is connected via the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1. Is formed, and the circulating current IC flows.

また、負荷電流ＩＬは中性点Ｎから、抵抗用バルブＷ１、限流抵抗Ｒ１の回路と抵抗用バルブＷ２、限流抵抗Ｒ２の回路に、限流抵抗Ｒ１、Ｒ２の抵抗比に見合って分流する。ここではＲ１=Ｒ２とする。つまり、負荷電流ＩＬは抵抗用バルブＷ１、限流抵抗Ｒ１の回路と抵抗用バルブＷ２、限流抵抗Ｒ２の回路とでＩＬ／２が流れる。   Further, the load current IL is divided from the neutral point N to the circuit of the resistance valve W1 and the current limiting resistor R1 and the circuit of the resistance valve W2 and the current limiting resistor R2 in accordance with the resistance ratio of the current limiting resistors R1 and R2. To do. Here, R1 = R2. In other words, the load current IL flows through the resistor valve W1 and the current limiting resistor R1 through the resistor valve W2 and the current limiting resistor R2 as IL / 2.

（Ｅ）切換スイッチの動作 （図７の（Ｅ））
さらに、切換スイッチＳの可動接触子ＳＣが固定接点ＳＡから固定接点ＳＢ側へと移動を開始する。 (E) Operation of changeover switch ((E) of FIG. 7)
Further, the movable contact SC of the changeover switch S starts to move from the fixed contact SA to the fixed contact SB side.

（Ｆ）通電タップ２側の抵抗用バルブＷ１の開極 （図７の（Ｆ））
切換スイッチＳの可動接触子ＳＣが固定接点ＳＡから固定接点ＳＢへと移動した後、切換動作前に通電しているタップ２側の抵抗用バルブＷ１が開極する。負荷電流ＩＬは、点線のように抵抗用バルブＷ２、限流抵抗Ｒ２、可動接触子Ｍ２、タップ３、タップ巻線ＴＷという回路に流れる。 (F) Opening of the resistance valve W1 on the energizing tap 2 side ((F) in FIG. 7)
After the movable contact SC of the changeover switch S moves from the fixed contact SA to the fixed contact SB, the tap-side resistance valve W1 that is energized before the switching operation is opened. The load current IL flows through a circuit including a resistance valve W2, a current limiting resistor R2, a movable contact M2, a tap 3, and a tap winding TW as indicated by a dotted line.

（Ｇ）主バルブＨの閉極 （図７の（Ｇ））
抵抗用バルブＷ１が開極した後、主バルブＨが閉極し、負荷電流ＩＬを中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＢ、タップ巻線ＴＷという回路に移す。 (G) Closing of main valve H ((G) in FIG. 7)
After the resistance valve W1 is opened, the main valve H is closed, and the load current IL is moved from the neutral point N to the main valve H, the movable contact SC of the changeover switch S, the fixed contact SB, and the tap winding TW. Move to.

（Ｈ）通電接触子Ｃ２の接続 （図７の（Ｈ））
最後に、通電接触子Ｃ２が通電接点固定接点ＣＢに接続され、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接触子ＳＣ、固定接点ＳＢ、可動接触子Ｍ２、タップ３、タップ巻線ＴＷという回路と、中性点Ｎから通電接触子Ｃ２、接点ＣＢ、可動接触子Ｍ２、タップ３、タップ巻線ＴＷという回路に分流する。これで、切換動作を完了し、図示の状態で運転を継続する。なお、次のタップへの切換動作は図８（２）に示す（Ｈ）から（Ａ）への順で行われる。 (H) Connection of energizing contact C2 ((H) in FIG. 7)
Finally, the energizing contact C2 is connected to the energizing contact fixed contact CB, and the load current IL is changed from the neutral point N to the main valve H, the movable switch SC of the changeover switch S, the fixed contact SB, the movable contact as shown by the dotted line. The current is divided from the neutral point N into a circuit called a child M2, a tap 3, and a tap winding TW, and a circuit called a current-carrying contact C2, a contact CB, a movable contact M2, a tap 3, and a tap winding TW. Thus, the switching operation is completed and the operation is continued in the state shown in the drawing. Note that the switching operation to the next tap is performed in the order from (H) to (A) shown in FIG.

（４−３）作用効果
以上のような切換シーケンスを有する第４の実施形態は、上記第２の実施形態の切換シーケンスに、通電接点固定接点ＣＡ、ＣＢに接離する通電接触子Ｃ１、Ｃ２の動作を加えたものである。 (4-3) Operational Effects In the fourth embodiment having the switching sequence as described above, in the switching sequence of the second embodiment, the energizing contacts C1 and C2 that are in contact with and away from the energizing contact fixed contacts CA and CB. Is added.

つまり、第２の実施形態と同じく、次のタップへの切換動作である図８（２）の（Ｆ）から（Ａ）の真空バルブの動作順序を前タップの切換動作を逆に動作させたとき（図８（１）の（Ｆ）から（Ａ））と同じにすることができる。このため、真空バルブ開閉駆動機構の簡略化および動作信頼性の向上といった効果を得ることができる。   That is, as in the second embodiment, the operation order of the vacuum valve from (F) to (A) in FIG. 8 (2), which is the switching operation to the next tap, is reversed from the switching operation of the previous tap. Time ((F) to (A) in FIG. 8 (1)). For this reason, effects such as simplification of the vacuum valve opening / closing drive mechanism and improvement of operation reliability can be obtained.

また、第４の実施形態の持つ独自の作用効果は、次の点である。すなわち、常時の運転状態（図７（Ａ）あるいは（Ｈ））で負荷電流ＩＬが通電接触子Ｃ１と主バルブＨ、あるいは通電接触子Ｃ２と主バルブＨに分流している。主バルブＨのみで負荷電流ＩＬを通電する場合には、通電状態における電極の温度上昇を抑えるべく、主バルブＨの電極間の接触荷重を大きくし、電極間での接触抵抗を小さくする必要がある。   Moreover, the original effect which 4th Embodiment has is the following points. That is, the load current IL is divided into the energizing contact C1 and the main valve H or the energizing contact C2 and the main valve H in the normal operation state (FIG. 7A or 7H). When the load current IL is applied only by the main valve H, it is necessary to increase the contact load between the electrodes of the main valve H and reduce the contact resistance between the electrodes in order to suppress the temperature rise of the electrodes in the energized state. is there.

常時の運転状態（図７（Ａ）あるいは（Ｈ））における負荷電流ＩＬを通電接触子Ｃ１と主バルブＨ、あるいは通電接触子Ｃ２と主バルブＨに分流できれば、主バルブＨの接触荷重および通電接触子における接点接触荷重を低く抑えることができる。したがって、通電接触子Ｃ１、Ｃ２を備えた本実施形態によれば、切換開閉器駆動機構部を簡素化することが可能である。また、主バルブＨには通電能力を無視し、遮断能力が優れた真空バルブを採用することもでき、信頼性がいっそう高まる。   If the load current IL in the normal operation state (FIG. 7 (A) or (H)) can be divided into the energizing contact C1 and the main valve H, or the energizing contact C2 and the main valve H, the contact load and energization of the main valve H can be achieved. The contact contact load in the contact can be kept low. Therefore, according to this embodiment provided with energization contacts C1 and C2, it is possible to simplify the switching switch drive mechanism. In addition, the main valve H can ignore the current-carrying capacity, and can adopt a vacuum valve having an excellent shut-off capacity, thereby further improving the reliability.

さらに、第４の実施形態では、主バルブＨの遮断電流の最大値を抑えて安定した遮断能力を有した切換開閉器を得ることができる。また、図７（Ｃ）の状態において、主バルブＨの遮断失敗が生じても、切換スイッチＳにより強制的に回路を開くことができため、切換スイッチＳにおいて電流遮断が可能となるといった利点がある。   Furthermore, in the fourth embodiment, it is possible to obtain a switching switch having a stable cutoff capability by suppressing the maximum value of the cutoff current of the main valve H. Further, in the state shown in FIG. 7C, even when the main valve H fails to be shut off, the circuit can be forcibly opened by the changeover switch S, so that the current can be cut off at the changeover switch S. is there.

（５）他の実施形態
なお、本発明は上記の実施形態に限定されるものではなく、上記の実施形態を適宜組み合わせることも可能である。具体的には図９および図１０に示した実施形態は第２および第３の実施形態を組み合わせたものである。 (5) Other Embodiments The present invention is not limited to the above-described embodiments, and the above-described embodiments can be appropriately combined. Specifically, the embodiment shown in FIGS. 9 and 10 is a combination of the second and third embodiments.

この実施形態では、（Ａ）運転状態、（Ｂ）主バルブＨの開極、（Ｃ）切換スイッチＳの動作、（Ｄ）非通電タップ３側の抵抗用バルブＷ２の閉極、（Ｅ）通電タップ２側の抵抗用バルブＷ１の開極、（Ｆ）主バルブＨの閉極といった切換過程となる。   In this embodiment, (A) operating state, (B) opening of the main valve H, (C) operation of the changeover switch S, (D) closing of the resistance valve W2 on the non-energizing tap 3 side, (E) The switching process includes opening of the resistance valve W1 on the energizing tap 2 side and (F) closing of the main valve H.

このような実施形態によれば、上述した第２および第３の実施形態が持つ独自の作用効果（切換方向によらない安定した真空バルブ開閉動作の確保と、切換スイッチでの遮断電流の最大値抑制による切換スイッチのコンパクト化）を併せ持つことが可能である。   According to such an embodiment, the unique operational effects of the second and third embodiments described above (ensuring a stable vacuum valve opening / closing operation regardless of the switching direction and the maximum value of the cutoff current at the changeover switch) It is possible to have a changeover switch made compact by suppression).

また、本発明に係る更に他の実施形態としては、図１１および図１２に示すように、限流抵抗Ｒ１と抵抗用バルブＷ１の間と、限流抵抗Ｒ２と抵抗用バルブＷ２の間には放電ギャップや非線形抵抗器等の過電圧保護器１００を挿入してもよい。   Further, as still another embodiment according to the present invention, as shown in FIGS. 11 and 12, between the current limiting resistor R1 and the resistance valve W1, and between the current limiting resistor R2 and the resistance valve W2, An overvoltage protector 100 such as a discharge gap or a non-linear resistor may be inserted.

外来のサージ等で、タップ間に過電圧が発生したとすると、切換スイッチＳの固定接点ＳＡとＳＢの極間と、抵抗用バルブＷ２の極間に過大電圧が印加される。この場合、抵抗用バルブＷ２が絶縁破壊し、タップ選択器の可動接触子Ｍ２、限流抵抗Ｒ２、抵抗用バルブＷ２、主バルブＨ、可動接触子ＳＣの回路に、限流抵抗Ｒ２で制限された放電電流が流れる。頻繁に抵抗用バルブＷ２の接点間での放電が起こると接点を損傷しやすくなるといった不具合が生じる。   If an overvoltage is generated between taps due to an external surge or the like, an overvoltage is applied between the fixed contacts SA and SB of the changeover switch S and between the resistance valve W2. In this case, the resistance valve W2 breaks down and is limited to the circuit of the movable contact M2, the current limiting resistor R2, the resistance valve W2, the main valve H, and the movable contact SC of the tap selector by the current limiting resistor R2. Discharge current flows. If discharge frequently occurs between the contacts of the resistance valve W2, there is a problem that the contacts are easily damaged.

そこで、図１１および図１２に示した実施形態によれば、過電圧保護器１００の制限電圧を切換スイッチＳの固定接点ＳＡとＳＢの極間破壊電圧および抵抗用バルブＷ２の電極間よりも低い値にしておくことで、所定の制限レベルを越えると、過電圧保護器１００が動作し、抵抗用バルブＷ２の接点での放電を防止することができる。   Therefore, according to the embodiment shown in FIG. 11 and FIG. 12, the limiting voltage of the overvoltage protector 100 is lower than the breakdown voltage between the fixed contacts SA and SB of the changeover switch S and between the electrodes of the resistance valve W2. Thus, when the predetermined limit level is exceeded, the overvoltage protector 100 operates and discharge at the contact of the resistance valve W2 can be prevented.

本発明に係る第１の実施形態の切換回路および動作図。The switching circuit and operation | movement figure of 1st Embodiment which concern on this invention. 図１に示した第１の実施形態の切換シーケンス図。The switching sequence diagram of 1st Embodiment shown in FIG. 本発明に係る第２の実施形態の切換回路および動作図。The switching circuit and operation | movement figure of 2nd Embodiment which concern on this invention. 図３に示した第２の実施形態の切換シーケンス図。The switching sequence diagram of 2nd Embodiment shown in FIG. 本発明に係る第３の実施形態の切換回路および動作図。The switching circuit and operation | movement diagram of 3rd Embodiment based on this invention. 図５に示した第３の実施形態の切換シーケンス図。FIG. 6 is a switching sequence diagram of the third embodiment shown in FIG. 5. 本発明に係る第４の実施形態の切換回路および動作図。The switching circuit and operation | movement diagram of 4th Embodiment based on this invention. 図７に示した第４の実施形態の切換シーケンス図。FIG. 8 is a switching sequence diagram of the fourth embodiment shown in FIG. 7. 本発明に係る他の実施形態の切換回路および動作図。The switching circuit and operation | movement figure of other embodiment which concern on this invention. 図９に示した他の実施形態の切換シーケンス図。The switching sequence figure of other embodiment shown in FIG. 本発明に係る更に他の実施形態の切換回路および動作図。The switching circuit and operation | movement figure of further another embodiment concerning this invention. 図１１に示した更に他の実施形態の切換シーケンス図。The switching sequence diagram of further another embodiment shown in FIG. 従来の切換開閉器における切換回路および動作図。The switching circuit and operation | movement figure in the conventional switching switch. 従来の切換開閉器における切換シーケンス図。The switching sequence diagram in the conventional switching switch.

符号の説明Explanation of symbols

２、３…タップ巻線のタップ
Ａ、Ｈ…主バルブ
Ｃ、Ｄ、Ｗ１、Ｗ２…抵抗用バルブ
ＣＡ、ＣＢ…通電接点固定接点
Ｃ１、Ｃ２…通電接触子
ｈ…切換スイッチ可動接触子
ｈ１、ｈ２…切換スイッチ固定接点
ＩＬ…負荷電流
ＩＣ…循環電流
Ｍ１、Ｍ２…タップ選択器可動接触子
Ｎ…中性点
Ｒ１、Ｒ２…限流抵抗
ＳＡ、ＳＢ…切換スイッチの固定接点
ＳＣ…切換スイッチの可動接触子
ＴＷ…タップ巻線
ＵＳ…タップ間ステップ電圧
１００…過電圧保護器 2, 3 ... Taps A, H of the tap windings ... Main valves C, D, W1, W2 ... Resistance valves CA, CB ... Energized contact fixed contacts C1, C2 ... Energized contacts h ... Changeover switch movable contacts h1, h2 ... changeover switch fixed contact IL ... load current IC ... circulating current M1, M2 ... tap selector movable contact N ... neutral point R1, R2 ... current limiting resistor SA, SB ... changeover switch fixed contact SC ... changeover switch Movable contact TW ... Tap winding US ... Step voltage 100 between taps ... Overvoltage protector

Claims (6)

タップ巻線のタップを選択するタップ選択器の２個の第１の可動接触子を設け、これら第１の可動接触子と中性点の間に、前記第１の可動接触子の各々に直列に接続された限流抵抗と抵抗用バルブをそれぞれ設置し、前記第１の可動接触子と前記限流抵抗の間にそれぞれ設けた複数の固定接点と、前記複数の固定接点のうちの一方を選択する第２の可動接触子とからなる切換スイッチと、前記切換スイッチの前記第２の可動接触子と中性点の間に主バルブを接続し、
切換動作前に通電しているタップ側の前記抵抗用バルブが閉極、切換動作前に通電していないタップ側の前記抵抗用バルブが開極のとき、前記主バルブが開極するように構成したことを特徴とする負荷時タップ切換装置。 Two first movable contacts of a tap selector for selecting a tap of the tap winding are provided, and each of the first movable contacts is connected in series between the first movable contact and the neutral point. A current limiting resistor and a resistance valve connected to each other, and a plurality of fixed contacts provided between the first movable contact and the current limiting resistor, respectively, and one of the plurality of fixed contacts. A changeover switch comprising a second movable contact to be selected, and a main valve connected between the second movable contact and the neutral point of the changeover switch;
The main valve is opened when the tap-side resistance valve that is energized before the switching operation is closed and the tap-side resistance valve that is not energized before the switching operation is open. An on-load tap changer characterized by that. タップ巻線のタップを選択するタップ選択器の２個の第１の可動接触子を設け、これら第１の可動接触子と中性点の間に、前記第１の可動接触子の各々に直列に接続された限流抵抗と抵抗用バルブをそれぞれ設置し、前記第１の可動接触子と前記限流抵抗の間にそれぞれ設けた複数の固定接点と、前記複数の固定接点のうちの一方を選択する第２の可動接触子とからなる切換スイッチと、前記切換スイッチの前記第２の可動接触子と中性点の間に主バルブを接続し、
切換動作前に通電しているタップ側の前記抵抗用バルブが閉極、切換動作前に通電していないタップ側の前記抵抗用バルブが開極のとき、前記主バルブが開極し、
前記主バルブが開極した後、切換動作前に通電しているタップ側の前記抵抗用バルブが閉極、切換動作前に通電していないタップ側の前記抵抗用バルブが開極の状態で、前記切換スイッチの前記第２の可動接触子が動作を開始し、切換動作前に接触していた固定接点との電気的接続を開離し、
前記切換スイッチの電気的接続が開離した後、切換動作前に通電していないタップ側の前記抵抗用バルブが閉極するように構成したことを特徴とする負荷時タップ切換装置。 Two first movable contacts of a tap selector for selecting a tap of the tap winding are provided, and each of the first movable contacts is connected in series between the first movable contact and the neutral point. A current limiting resistor and a resistance valve connected to each other, and a plurality of fixed contacts provided between the first movable contact and the current limiting resistor, respectively, and one of the plurality of fixed contacts. A changeover switch comprising a second movable contact to be selected, and a main valve connected between the second movable contact and the neutral point of the changeover switch;
When the resistance valve on the tap side that is energized before the switching operation is closed, the main valve is opened when the resistance valve on the tap side that is not energized before the switching operation is open,
After the main valve is opened, the tap-side resistance valve that is energized before the switching operation is closed, and the tap-side resistance valve that is not energized before the switching operation is open, The second movable contact of the change-over switch starts operation, and disconnects the electrical connection with the fixed contact that was in contact before the change-over operation;
An on-load tap switching device characterized in that, after the electrical connection of the selector switch is disconnected, the resistance valve on the tap side that is not energized before the switching operation is closed. タップ巻線のタップを選択するタップ選択器の２個の第１の可動接触子を設け、これら第１の可動接触子と中性点の間に、前記第１の可動接触子の各々に直列に接続された限流抵抗と抵抗用バルブをそれぞれ設置し、前記第１の可動接触子と前記限流抵抗の間にそれぞれ設けた複数の固定接点と、前記複数の固定接点のうちの一方を選択する第２の可動接触子とからなる切換スイッチと、前記切換スイッチの前記第２の可動接触子と中性点の間に主バルブを接続し、
切換動作前に通電しているタップ側の前記抵抗用バルブが閉極、切換動作前に通電していないタップ側の前記抵抗用バルブが開極のとき、前記主バルブが開極し、
前記主バルブが開極した後、切換動作前に通電していないタップ側の前記抵抗用バルブが閉極し、
切換動作前に通電していないタップ側の前記抵抗用バルブが閉極した後、切換動作前に通電しているタップ側の前記抵抗用バルブが開極し、
切換動作前に通電しているタップ側の前記抵抗用バルブが開極した後、前記主バルブが閉極するように構成したことを特徴とする負荷時タップ切換装置。 Two first movable contacts of a tap selector for selecting a tap of the tap winding are provided, and each of the first movable contacts is connected in series between the first movable contact and the neutral point. A current limiting resistor and a resistance valve connected to each other, and a plurality of fixed contacts provided between the first movable contact and the current limiting resistor, respectively, and one of the plurality of fixed contacts. A changeover switch comprising a second movable contact to be selected, and a main valve connected between the second movable contact and the neutral point of the changeover switch;
When the resistance valve on the tap side that is energized before the switching operation is closed, the main valve is opened when the resistance valve on the tap side that is not energized before the switching operation is open,
After the main valve is opened, the resistance valve on the tap side not energized before the switching operation is closed,
After the resistance valve on the tap side that is not energized before the switching operation is closed, the resistance valve on the tap side that is energized before the switching operation is opened,
An on-load tap switching device characterized in that the main valve is closed after the resistance valve on the tap side that is energized before the switching operation is opened. 前記主バルブ及び抵抗用バルブを、真空バルブで構成したことを特徴とする請求項１〜３のいずれか１項に記載の負荷時タップ切換装置。   The on-load tap switching device according to any one of claims 1 to 3, wherein the main valve and the resistance valve are constituted by vacuum valves. タップ選択器の２個の第１の可動接触子と限流抵抗の間にそれぞれ通電接点固定接点が設けられ、これら通電接点固定接点と中性点とを接離可能な通電接触子が前記中性点に接続されていることを特徴とする請求項１〜３のいずれか１項に記載の負荷時タップ切換装置。 A current-carrying contact fixed contact is provided between each of the two first movable contacts of the tap selector and the current limiting resistor, and the current-carrying contact that can contact and separate the current-carrying contact fixed contact and the neutral point The on-load tap switching device according to any one of claims 1 to 3, wherein the tap switching device is connected to a sex point. 前記限流抵抗と前記抵抗用バルブとの接続点相互間に過電圧保護器を接続したことを特徴とする請求項１〜３のいずれか１項に記載の負荷時タップ切換装置。   4. The on-load tap switching device according to claim 1, wherein an overvoltage protector is connected between connection points of the current limiting resistor and the resistance valve. 5.
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CN101009155B (en) 2010-05-19
CN101009155A (en) 2007-08-01

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