JPS5980506A - Hydraulic operation circuit of breaker - Google Patents

Abstract

PURPOSE:To recover the function of a self-maintaining mechanism by letting pressure at the time of rising again after lowering of system pressure flow in a by-pass pipeline including a pressure sensing element connecting a pressure source and an operation valve, a detent element and a check valve so that lowering of system pressure may not cause intercepting state. CONSTITUTION:A self-maintaining operation chamber 162 of the first hydraulic operation switching valve 121 is provided with a pipeline a-b-c directly connected with a pressure source 17, which includes a pressure sensing element 23, a detent element 24 and a check valve in the midway thereof. When system pressure is lowered, the pressure in an operation chamber 27 of the pressure sensing element 223 is lowered to open P port and A port, so that pipelines (c), (b) communicate with each other, and pipeline (b) and (a) communicate with each other through a detent element 24. The pressurized oil in the operation chamber 16 gradually leaks out, so that the pipeline between P port and A port is stopped by a ball valve 13. At this time, a piston 2' retains throw-in position, so that a cause for lowering of system pressure can be removed to start increasing system pressure. Whereupon, the system pressure is introduced to the operation chamber 162 through pipelines c-b-a.

Description

【発明の詳細な説明】 この発明は、操作弁に自己保持機構を備えた高電圧大電
流用しゃ断器の油圧操作回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic operating circuit for a high-voltage, large-current circuit breaker in which an operating valve is provided with a self-holding mechanism.

一般に、この種の油圧操作回路は、しゃ断器を操作する
油圧シリンダー、油圧シリンダーに操作用の圧油を送る
主弁、主弁に操作用の圧油な送る操作弁、操作弁を駆動
する投入用ソレノイド弁およびしゃ新月ソレノイド弁と
で構成ざわる。In general, this type of hydraulic operation circuit consists of a hydraulic cylinder that operates a breaker, a main valve that sends pressure oil for operation to the hydraulic cylinder, an operation valve that sends pressure oil for operation to the main valve, and an input that drives the operation valve. It consists of a solenoid valve and a solenoid valve.

七り、て、上記油圧操作回路には自己保持機構が設けら
れている。Seventh, the hydraulic operation circuit is provided with a self-holding mechanism.

自己保持機構は上記油圧シリンダーの投入状態を油圧回
路に流れる圧油を用いて保持し、しゃ断器の接触子がそ
の投入位置から不用意に動くのを防止するものである。The self-holding mechanism maintains the closed state of the hydraulic cylinder using pressure oil flowing through the hydraulic circuit, and prevents the contactor of the breaker from inadvertently moving from its closed position.

第１図は、操作弁（４）の側に設けた自己保持機構を示
したもので、この場合、圧力源αηの圧油を主弁（３）
に送る操作弁（４）ばＰボート、Ａポート、Ｒポートを
有する８ボ一ト２位置切換弁の一種である第１、第２の
同曲圧作動切換弁（１２／Ｘ１２コ）を主体に構成され
、第１の油圧作動切換弁（１２／）には２つの操作室（
１６／）（１６Ｊ）が設けられている。Figure 1 shows a self-holding mechanism installed on the side of the operating valve (4). In this case, pressure oil from the pressure source αη is transferred to the main valve (3).
The main components are the first and second pressure-operated switching valves (12/X12), which are a type of 8-bot 2-position switching valve that has a P boat, an A port, and an R port. The first hydraulically operated switching valve (12/) has two operation chambers (
16/) (16J) is provided.

すなわち、第１の油圧作動切換弁（１２１）Ｕ、その一
方の操作室（１６／）に投入用ソレノイド弁（５）から
の管路が接続でれ、他方の操作室（１６ｘ）にＨＡボー
ドと主弁（３）とを結ぶ管路の分岐管が、しゃ新剤ソレ
ノイド弁（６）　Ｋて駆動される第２の油圧作動切換弁
（１２λ）を介して接続されている。That is, the first hydraulically operated switching valve (121)U, the conduit from the closing solenoid valve (5) is connected to one operation chamber (16/), and the HA board is connected to the other operation chamber (16x). A branch pipe of the pipeline connecting the main valve (3) and the main valve (3) is connected via a second hydraulically operated switching valve (12λ) driven by the barrier agent solenoid valve (6).

そして、投入用ソレノイド弁（５）を励磁すると操作室
（１６／）に圧油が流れ、操作ピストンａｅハ左側へ移
動し、ボール弁ａ３がＰボー）−Ａポート間を開放して
圧力源αηから送出される圧油が主弁（３〕と第２の油
圧作動切換弁（１２コ）のＰポートとに送られる。Then, when the closing solenoid valve (5) is energized, pressure oil flows into the operation chamber (16/), the operation piston ae moves to the left, and the ball valve a3 opens between the P port and the A port to supply pressure. Pressure oil sent from αη is sent to the main valve (3) and the P port of the second hydraulically operated switching valve (12).

主弁（３）ハ上記圧油の供給を受けて油圧シリンダー（
図示せず）を操作し、しゃ断器の接触子（図示せず）を
投入位置にセットする。The main valve (3) is supplied with the above pressure oil to the hydraulic cylinder (
(not shown) to set the breaker contactor (not shown) to the closing position.

一方、第２の油圧作動切換弁（１２２）のＰポートに送
られた圧油はＰポート−Ａポートを経て第１の油圧作動
切換弁ｑ２／）の操作室（１６，２）に入り、操作ピヌ
トンαＱを左側へ押圧し続ける。On the other hand, the pressure oil sent to the P port of the second hydraulically operated switching valve (122) enters the operation chamber (16, 2) of the first hydraulically operated switching valve q2/) via the P port-A port, Operation Continue to press Pinuton αQ to the left.

従って、投入用、ソレノイド弁（５）を消磁し、操作室
（１６／）内の圧油をタンクへ回収しても、操作室（１
６，２）内の圧油にそのまま保持されるから、操作ピス
トンａＯは左側に移動したままの状態を維持し、その結
果、主弁（３〕にも圧油が保持され、しやｌ１ｆｒ器が
投入状態を自己保持することになる。Therefore, even if the input solenoid valve (5) is demagnetized and the pressure oil in the operation chamber (16/) is recovered to the tank, the operation chamber (16/)
6, 2), the operating piston aO remains moved to the left, and as a result, pressure oil is also held in the main valve (3), causing the piston aO to move to the left. will self-maintain the closed state.

ところが、斯かる自己保持機構では、圧力源αηの圧力
（以下システム圧力と称する）が常に正常である限シは
全く問題を生じないのであるが、前記の投入状態でシス
テム圧力が何らかの理由例えば圧力源の油漏れ等によっ
て低下した場合に、その原因を取除いて再びシステム圧
力を上昇させた場合、しゃ断器にシステム圧力低下前の
投入状態を維持することができず、システム圧力が徐々
に回復するにつれて、しゃ断指令を与えなくてもしゃ断
器が徐々にしゃ断状態に移行してしまうという問題を生
じる。However, with such a self-holding mechanism, no problem occurs as long as the pressure of the pressure source αη (hereinafter referred to as system pressure) is always normal, but if the system pressure changes for some reason in the above-mentioned closed state, for example, the pressure If the system pressure drops due to an oil leak, etc., and the cause is removed and the system pressure is raised again, the breaker will not be able to maintain the closed state before the system pressure dropped, and the system pressure will gradually recover. As a result, a problem arises in that the breaker gradually shifts to the cut-off state even without giving a cut-off command.

すなわち、システム圧力が低下すると、前記第１の油圧
作動切換弁（１２／）の自己保持のための操作室（１６
２）の圧力も低下するから操作ピッ１フａ時は右方向へ
復帰し、ボール弁（Ｊ東がＰポート−Ａポート間を閉止
することになる。とのため、システム圧力を再び上昇さ
せても主弁（３）に圧油が供給δれないからでるる〇 この問題の解決策として、従来２つの方法が提案てれて
いる。That is, when the system pressure decreases, the operation chamber (16/) for self-maintenance of the first hydraulically operated switching valve (12/)
2) Pressure also decreases, so when the operation pick 1 is a, it will return to the right direction and the ball valve (J East will close between the P port and the A port. Therefore, the system pressure will increase again. Two methods have been proposed to solve this problem.

第１の方法は、上記操作ピストンａｅをシステム圧力の
低下時に機械的にクランプして右方向へ復帰しないよう
に保持し、再びシステム圧、力が上昇した時に主弁に圧
油が供給ぢれるようにしようとするものであシ、第２の
方法は、しゃ断器を直接操作する油圧シリンダーのピス
トンロッドをシステム圧力の低下時に機械的にクランプ
してしゃ断器の投入状態を保持しようとするものでろる
。The first method is to mechanically clamp the operating piston ae to prevent it from returning to the right when the system pressure drops, and when the system pressure and force rise again, pressure oil is supplied to the main valve. The second method attempts to maintain the closed state of the breaker by mechanically clamping the piston rod of the hydraulic cylinder that directly operates the breaker when the system pressure decreases. Deroru.

しかしながら、これらの方法はいずれもシステム圧力が
再び上昇した場合に生じる油圧力に抗して前記操作ビヌ
トンα０またはピストンロッドをクランプするだけの頑
強かつ複雑な構造のクランプ装置を設けなければならず
、このクランプ装置の信頼性にも問題がめった。However, all of these methods require a clamping device with a sturdy and complicated structure to clamp the operating binuton α0 or piston rod against the hydraulic pressure generated when the system pressure rises again. The reliability of this clamping device has also been problematic.

本発明は、斯かる実状に鑑みなされたもので、前記第１
の油圧作動切換弁（１２／）の自己保持のための操作室
（１６，２）に、該操作室（１６Ｊ）と圧力源α力とを
直結する新たな管路を設け、該管路の途中にシステム圧
力の低下時のみ管路を開放する圧力感知素子と投入用ソ
レノイド弁（５）の駆動に連動して管路を開き、しゃ新
剤ソレノイド弁（６）の駆動に連動して管路を閉じるデ
ィテント素子、てらにチェック弁とを設けてしゃ断器の
投入状態でかつ低圧時にのみ当該管路にシステム圧力が
送給されるようになし、システム圧力の再上昇時に該管
路へ流れるシステム圧力自身によって操作ピストンａ０
が左方向へ押圧され、Ｐポート−Ａポート間を開放して
回復したシステム圧力が主弁（３）に供給でれるように
したしゃ断器の油圧操作回路を提供することにより前記
従来の問題を一挙に解消しようとするものである。The present invention has been made in view of the above-mentioned circumstances, and the present invention has been made in view of the above-mentioned
A new pipe line is provided in the operation chamber (16, 2) for self-holding of the hydraulically operated switching valve (12/) to directly connect the operation chamber (16J) to the pressure source α force. Along the way, the pipeline is opened in conjunction with the activation of the pressure sensing element and the input solenoid valve (5), which opens the pipeline only when the system pressure decreases, and the pipeline is opened in conjunction with the activation of the barrier agent solenoid valve (6). A detent element that closes the line and a check valve are provided on the end so that system pressure is supplied to the line only when the breaker is closed and the pressure is low, and when the system pressure rises again, the system pressure flows to the line. Piston a0 operated by system pressure itself
The above-mentioned conventional problem can be solved by providing a hydraulic operation circuit for a breaker that is pressed leftward, opens the P port and A port, and allows the recovered system pressure to be supplied to the main valve (3). This is an attempt to eliminate them all at once.

以下、掲げた図面に基づき本発明の詳細な説明する。Hereinafter, the present invention will be described in detail based on the accompanying drawings.

第２図において、（１）は電力用のしゃ断器、（２）は
しゃ断器＜１＞’（ｉ−操作する油圧シリンダー、（３
）に油圧シリンダー（２）に操作用の圧油を送る主弁、
（４）は主弁（３）に操作用の圧油を送る操作弁、（５
）と（６）は操作弁（４）を駆動する投入用ソレノイド
弁としゃ断片ソレノイド弁をそれぞれ表わしている。In Fig. 2, (1) is a power breaker, (2) is a breaker <1>' (i-operated hydraulic cylinder, (3
), a main valve that sends operating pressure oil to the hydraulic cylinder (2);
(4) is an operating valve that sends operating pressure oil to the main valve (3);
) and (6) respectively represent the closing solenoid valve and the closing solenoid valve that drive the operation valve (4).

主弁（３）はＰポート、Ａポート、Ｒポートを有するＢ
ボ・−計２位置切換弁の一種で、Ｐポー１−−Ａボート
間の開閉を司るポペット弁（７）、ポペット弁（７）の
操作ピストン（８）、操作ピストン（８）の操作室（９
）、Ａボート−Ｒボート間の開閉を司るポペット弁αＯ
等で構成される。そしてＰボートは油圧シリンダー（２
）のロッド側とアキュムレーター０υとに接続され、Ａ
ポートは油圧シリンダー（２）のボア側に接続されてい
る。The main valve (3) has a P port, an A port, and a B port.
A type of 2-position switching valve in total, which controls the opening and closing between P port 1 and A port, a poppet valve (7), an operating piston (8) for the poppet valve (7), and an operating chamber for the operating piston (8). (9
), poppet valve αO that controls opening and closing between A boat and R boat
Consists of etc. And the P boat has a hydraulic cylinder (2
) is connected to the rod side of the accumulator 0υ,
The port is connected to the bore side of the hydraulic cylinder (2).

操作弁（４）はＰポート、Ａボート、Ｒボートを有する
８ボ一ト２位置切換弁の一種である第１および第２の同
曲圧作動切換弁（１２／）（１２，２）　ｋ主体ｖｃＩ
？＋７成でれている。The operation valve (4) is a type of 8-point, 2-position switching valve having a P port, an A boat, and an R boat. Subject vcI
? +7 has been achieved.

第１の油圧作動切換弁（１２／）　ｎ　Ｐボート−ｐ、
ｒｙ−ト間の開閉を司をボール弁ａ３、Ａポー）−Ｒポ
ート間の開閉を司るボール弁α→、ボール弁αＩ→の操
作ピヌトンＯＬ操作ビヌトンαＯの２つの操作室（１６
／Ｘ１６．２）等を有する。この弁（１２／）のＰ′−
トは圧力源α７１に接び　れ、Ａボートは主弁（３）の
操作室（９）に接続されている。このＡボートと主弁（
３）の操作室（９）とを結ぶ管路は途中分岐せられ、チ
ェ゛ンク弁ａ枠を介して第２の油圧作動切換弁（１２ω
のＰｓ；−トに接続されている。Ｒボートはタンクに接
続ちれ、操作室（１６／）には投入用ソレノイド弁（５
）７５−ＩＥ）の管路が接続されている。First hydraulically operated switching valve (12/) n P boat-p,
Operation of ball valve a3, which controls the opening and closing between port A and port, ball valve α→, and ball valve αI, which controls the opening and closing between port A and R.Pinuton OL operation.
/X16.2) etc. P'- of this valve (12/)
The A boat is connected to the pressure source α71, and the A boat is connected to the control chamber (9) of the main valve (3). This A-boat and the main valve (
The pipe line connecting the operation room (9) of 3) is branched in the middle, and connected to the second hydraulically operated switching valve (12ω) via the check valve a frame.
is connected to Ps;-to. The R boat is connected to the tank, and the control room (16/) is equipped with a solenoid valve (5
)75-IE) are connected.

第２の油圧作動切換弁（１２ωはＰボート−Ａ；Ｊ＃−
ト間の開閉とＡポート−Ｒポート間の開閉とを司るボー
ル弁αす、ボール弁α・の操作ピストン翰、操作ピスト
ン翰の操作室Ｑ１）等を有する。この弁（１２，２）の
Ａボー）Ｕ第１の油圧作動切換弁（１２／）の今１つの
操作室（１６のに接続され、自らの操作室ｅυにはしゃ
断片ソレノイド弁（６）からの管路が接続きれている。Second hydraulically operated switching valve (12ω is P boat-A; J#-
It has a ball valve α which controls the opening and closing between the A port and the R port, an operating piston arm for the ball valve α, an operating chamber Q1 for the operating piston arm, and the like. This valve (12, 2) is connected to the operation chamber (16) of the first hydraulically actuated switching valve (12/), and its own operation chamber eυ is blocked by the fragment solenoid valve (6). The conduit from is disconnected.

Ｒポートはタンクに接続されている。The R port is connected to the tank.

第２の油圧作動切換弁（１２，２）のＡポートと第１の
油圧作動切換弁（１２／）の操作室（１６，２）とを結
ぶ管路には第１の油圧作動切換弁（１２／）のＰポート
と圧力源Ｃｌ７１とを結ぶ管路の分岐管がチェック弁（
イ）を介して接続されており、該管路の途中に圧力感知
素子翰とディテン［素子（ハ）とが設けられている。The first hydraulically operated switching valve ( A check valve (
A pressure sensing element (C) and a pressure sensing element (C) are provided in the middle of the conduit.

圧力感知素子翰とディテント素子は、ともにＰボート、
Ａボー１−１Ｒボートを有する油圧作動の３ボ一ト２位
置切換弁の一種であシ、管路の開閉操作を行なう。Both the pressure sensing element and the detent element are P boats,
This is a type of hydraulically operated 3-bot 2-position switching valve with an A-bow 1-1R boat, and is used to open and close pipes.

圧力感知素子（至）はＡボート、Ｒボートを設けたスリ
ーブ（ハ）内を軸方向に移動する左右一対のスプーｔｖ
ｑ翰とＰポートを設けた上記スプール弁翰の一方が収容
される操作室（財）等で構成されている。The pressure sensing element (to) is a pair of left and right spouts that move in the axial direction within the sleeve (c) provided with the A boat and the R boat.
It consists of an operation room (goods) etc. in which one of the above-mentioned spool valve handles provided with a Q handle and a P port is housed.

すなわち、右側のヌプーｌＬ／（２６イ）は自らの操作
室に）内にあってコーン状に形成してあシ、比較的弱い
バネ（２８イ）力で左側に押圧され、左側のスプール（
２６０）Ｉ／ｉ比較的強いバネ（２８０）力で右側に押
圧されている。That is, the right spool (26) is located in its own control room and is formed into a cone shape, and is pressed to the left by a relatively weak spring force (28).
260) I/i is pushed to the right by a relatively strong spring (280) force.

右側のコーン形スプー）１／（２６イ）ＵＰポートよυ
操作室動向に供給される油圧力が一定圧以上になると左
側ヌブー／１／（２６０）のバネ（２８０〕力に抗して
左方向へ移動し、スリーブ（ハ）と操作室Ｃｌ７１との
接続口に圧着してＰボート−Ａボート間を閉じ、操作室
（イ）内の油圧力が一定圧以下に低下すると左側スプー
ル（２６０）のノベネ（２８０）力に押されて右方向へ
復帰し、Ｐボート−Ａポート間を開放するようになって
いる。Right cone-shaped spout) 1/(26a) UP port υ
When the hydraulic pressure supplied to the operation chamber moves above a certain pressure, it moves to the left against the force of the spring (280) of the left Nuveu/1/(260), connecting the sleeve (c) and the operation chamber Cl71. The port is crimped to close the gap between the P boat and the A boat, and when the hydraulic pressure in the control chamber (a) drops below a certain pressure, it is pushed by the force of the novene (280) of the left spool (260) and returns to the right direction. , the connection between the P boat and the A port is opened.

左側のスプール（２６０）は右側のコーン形スプー／１
／（２６イ）が前記のＰボート−Ａポート間を閉じた状
態でＲポー、トを開き、該左側スブー／ｌ／　（２６０
）に穿孔された曲進（１）を通してＡボー）−Ｒポート
間を開放状態となし、右１ｒｌｌｌのコーン形ヌプール
（２６イ）が前記のＰポー）−Ａボート間を開いた状態
で油道（ト）をＲポートから断ち、Ａボー１−−Ｒボー
ト間を閉じるようになっている。The left spool (260) is the right cone-shaped spool/1
/(26a) closes the connection between the P boat and the A port, opens the R port, and connects the left side suboo /l/(260
) through the curved line (1) drilled in ) to open the port A-R The road (G) is cut off from R port, and the connection between A boat 1 and R boat is closed.

この圧力感知素子翰のＰボートは圧力源α力に接続芒れ
、Ａポートハ後述のディテント素子（ハ）のＰボートに
、Ｒボートはタンクにそれぞれ接続嘔れている。The P boat of the pressure sensing element is connected to the pressure source α, the A port is connected to the P boat of the detent element (c) which will be described later, and the R boat is connected to the tank.

ディテント素子（ハ）はスリーブ０］）内を軸方向に移
動する左右一対のスプール弁０２と、該スプール弁０の
の左右の操作室（８８４）（８３０）等で構成δれてい
る。The detent element (C) is composed of a pair of left and right spool valves 02 that move in the axial direction within the sleeve 0], operation chambers (884) (830) on the left and right sides of the spool valves 0, and the like.

すなわち、左側のヌクブール（８２イ）はＡボート−Ｒ
ボート間の開閉を司り、右側のスプール（３２０）はＰ
ボー）−Ａボート間の開閉を司る。左側の操作室（３３
イ）は投入用ソレノイド弁（５）に絞シ■を介して接続
され、右側の操作室（３３０）はしゃ断片ソレノイド弁
（６）に絞シ（至）を介して接続されている。In other words, the left Nokbool (82i) is A-Boat-R.
Controls the opening and closing between boats, and the right spool (320) is P
Controls the opening and closing between Boat A and Boat A. Control room on the left (33
A) is connected to the closing solenoid valve (5) via a throttle valve (3), and the right operation chamber (330) is connected to the cut-off solenoid valve (6) via a throttle valve.

上記左側スプール（３２イ）の左端表面に環状に穿設Ｇ
　ｔ’Ｌ　７’Ｃ２列Ｉ）　溝（８６１）（８６，２）
ｒｉ、スリーブＯＤ左端の内周面に突出せしめた弾発力
を有する数個のボール（ロ）・・・の嵌合受座で、左側
の溝（３６／）とポール（ロ）・・・とけスプール弁０
のがＰポー）−Ａポート間を開放した状態で嵌合し、そ
の位置にスプール弁６つを固定する。まだ右側の溝（３
６，２）とポール（ロ）・・・とはスプール弁０２がＡ
ポー）−Ｒポート間を開放した状態で嵌合し、その位置
にスプール弁０埠を固定するようになっている。Hole G in an annular shape on the left end surface of the above left spool (32i)
t'L 7'C2 row I) groove (861) (86,2)
ri, a fitting socket for several balls (b) with elastic force that protrude from the inner peripheral surface of the left end of the sleeve OD, and a groove (36/) on the left side and a pole (b)... Melt spool valve 0
The six spool valves are fitted in an open state between the P port and the A port, and the six spool valves are fixed in that position. Still on the right groove (3
6, 2) and Paul (b)... mean spool valve 02 is A.
The spool valve 0 is fitted in an open state between the port and the R port, and the spool valve 0 is fixed in that position.

そして、このディテント素子（ハ）のＡボートが前記第
２の油圧作動切換弁（１シ）のＡボートと第１の油圧作
動切換弁（１２／）の操作室（１６ａ）とを結ぶ管路に
チェック弁（２２を介して接続してｓｂ、Ｐポートは前
記圧力感知素子（イ）のＡポートと接続され、Ｒボート
はタンクに接続芒れている。The A-boat of this detent element (C) connects the A-boat of the second hydraulically operated switching valve (1S) and the operation chamber (16a) of the first hydraulically operated switching valve (12/). The P port is connected to the A port of the pressure sensing element (A), and the R boat is connected to the tank.

次に、この油圧操作回路の動作を説明する。Next, the operation of this hydraulic operation circuit will be explained.

第２図は、しゃ断器（１）がしゃ断状態の場合を示して
いる。この状態で圧力源（１７）からの圧油すなわちシ
ステム圧力が正常な場合は、システム圧力は第１の油圧
作動切換弁（１２／）のＰボートと圧力感知素子（ホ）
のＰボートとに供給きれておシ、圧力感知素子（財）は
内部のスプール弁（ハ）が操作室（イ）内のシステム圧
力によって左側に押圧され、コーン形ヌプール（２６イ
）がＰボート−Ａポート間を閉止し、スプール（２６０
）が曲進（至）を介してｐ、ホー）−Ｒホード間を開放
した状態を保持している。FIG. 2 shows a case where the circuit breaker (1) is in a disconnected state. In this state, if the pressure oil from the pressure source (17), that is, the system pressure, is normal, the system pressure is between the P boat of the first hydraulically operated switching valve (12/) and the pressure sensing element (H).
When the supply to the P boat is exhausted, the internal spool valve (c) of the pressure sensing element is pushed to the left by the system pressure in the control room (a), and the cone-shaped spool (26a) Close the boat-A port and connect the spool (260
) maintains an open state between p, ho) and R hoard via a curve (to).

また、ディテント素子（ハ）はスリーブ０υ内のスプー
ル０のが左側の破線で示す位置にあって、溝ω釦）とボ
ール（ロ）・・・とが嵌合し、Ｐボー）−Ａボート間が
閉止され、Ａボー）−Ｒポート間が開放１れた状態に固
定嘔れている。In addition, the detent element (C) has the spool 0 in the sleeve 0υ at the position shown by the broken line on the left, and the groove ω button) and the ball (B)... are fitted, and the P button) - A boat The port between the two ports is closed, and the port between the A port and the R port is fixed in an open state.

そこで今、投入用ソレノイド弁（５）を励磁すると、こ
の弁（５）からの圧油が第１の油圧作動切換弁（１２／
）の操作室（１６／）とディテント素子（ハ）の左側の
操作室（８財）とに供給される。Therefore, when the closing solenoid valve (5) is energized, the pressure oil from this valve (5) is transferred to the first hydraulically operated switching valve (12/
) and the operation chamber (8 units) on the left side of the detent element (c).

第１の油圧作動切換弁（１２／）の操作室（１６／）に
入った圧油は操作ピストンα０を左側へ押圧し、ポール
弁α弔がＡポー）−Ｒポート間を閉止すると同時にボー
ル弁α東がＰボー）−Ａボート間を開放してシステム圧
力を主弁（３）の操作室（９）とチェック弁θ枠を介す
る第２の油圧作動切換弁（１２，２）のＰボートとに供
給する。The pressure oil that has entered the operation chamber (16/) of the first hydraulically operated switching valve (12/) presses the operation piston α0 to the left, and at the same time, the pole valve α closes between the A port and R port. Valve α east opens between P bow) and A boat to transfer the system pressure to the control chamber (9) of the main valve (3) and the P of the second hydraulically operated switching valve (12, 2) via the check valve θ frame. Supply to the boat.

一方、ディテント素子（ハ）の左側の操作室（８３イ）
に入った圧油はスプール弁（イ）を右方向に押圧する。On the other hand, the operation room (83a) on the left side of the detent element (c)
The pressure oil that has entered presses the spool valve (A) to the right.

この圧力によって溝（８６コ）とボー／ｌ／＠・・・と
の嵌合が外れ、スプール弁０和浅線で示す如くの右側の
位置に移動し、Ａボー）−Ｒボート間を閉止するととも
にＰポー１−−Ａボート間を開放する。ポー２＋／＠・
・・はこの位置で溝（８６／）と嵌合し、スプール弁（
２）を固定する。Due to this pressure, the groove (86 pieces) and bow/l/@... are disengaged, and the spool valve moves to the right position as shown by the shallow line, closing the connection between A bow) and R boat. At the same time, the connection between P port 1 and A boat is opened. Poe 2+/@・
... is fitted into the groove (86/) at this position, and the spool valve (
2) Fix.

スプール弁０埠が右側に移動することによって、該ディ
テント素子（ハ）のＡボートと第１の油圧作動切換弁α
２／）の操作室（１６Ｊ）とを結ぶ管路（ａ）とディテ
ント素子（ハ）のＰポートと圧力感知素子翰のＡボート
とを結ぶ管路Ｃｂ）とが連通１れるが、これらの管路（
ａ）（ｂ）は圧力感知素子（財）内の曲進（７）を経て
タンクに通じておシ、またシステム圧力が正常な限シ圧
力感知素子（財）のコーン形スプール（２６イ）が上記
管路（ｂ）とシステム圧力の送給管路（（３）との間を
閉止しているから、上記管路（ａ）（ｂ）内の圧力は零
で１、チェック弁（イ）さらに第１の油圧作動切換弁（
１２／）の操作室（１６，２）に圧油が供給されること
はない。By moving the spool valve 0 to the right, the A boat of the detent element (c) and the first hydraulically operated switching valve α
The pipe (a) connecting the operation room (16J) of 2/) communicates with the pipe Cb) connecting the P port of the detent element (c) and the A boat of the pressure sensing element (1). Conduit (
a) and (b) are connected to the tank via the curved line (7) in the pressure sensing element, and as long as the system pressure is normal, the cone-shaped spool (26) of the pressure sensing element Since the above pipe (b) and the system pressure supply pipe ((3) are closed off, the pressure in the above pipes (a) and (b) is zero and 1, and the check valve (I) is closed. ) Furthermore, the first hydraulically operated switching valve (
Pressure oil is not supplied to the operation chamber (16, 2) of 12/).

前記第１の油圧作動切換弁（１２／）のＡポートから主
弁（３）の操作室（９）に供給されたシステム圧力は、
操作ピストン（８）を左側に押圧し、主弁（３）のＰポ
ー）−Ａポート間を開放する。油圧シリンダー（２）は
ロッド側よりボア側のほうが受圧面積が大きいから、Ｐ
ボー１−−Ａボート間の開放によってアキュムレーター
（１１）の圧油がシリンダー（２）のボア側に流れ、こ
の油流でシリンダー（２）内のピストン（２）が左側へ
移動し、該ピストン（２）のロンド先端部の接触子（１
）が投入状態にセットδれる。The system pressure supplied from the A port of the first hydraulically operated switching valve (12/) to the operation chamber (9) of the main valve (3) is
Push the operating piston (8) to the left to open the main valve (3) between the P port and the A port. The pressure receiving area of the hydraulic cylinder (2) is larger on the bore side than on the rod side, so P
By opening between boat 1 and boat A, the pressure oil in the accumulator (11) flows to the bore side of the cylinder (2), and this oil flow moves the piston (2) in the cylinder (2) to the left, Contact (1) at the tip of the piston (2)
) is set to the closed state.

ピストン（２）が左側に移動した時点で、シリンダー（
２）ボア側の圧力はアキュムレーター（１υおよび主弁
（３）の操作室（９）の圧力と同じになシ、油流が止ま
シ、操作ピストン（８）およびポペット弁（７）はバネ
（至）の力で右側に復帰し、Ｐボート−Ａポート佃が閉
じられる。この場合、ポペット弁αＯはバネＯＣによシ
左側ストロークエンドに保持されたままとなっているか
ら、油圧シリンダー（２）の駆動に際して回路が低圧側
につながることはない。When the piston (2) moves to the left, the cylinder (
2) The pressure on the bore side is the same as the pressure in the operating chamber (9) of the accumulator (1υ and main valve (3)), the oil flow stops, and the operating piston (8) and poppet valve (7) are It returns to the right side with the force of When driving 2), the circuit is not connected to the low voltage side.

また、前記第１の油圧作動切換弁（１２／）のＡボート
からチェック弁（至）を経て第２の油圧作動切換弁（１
２２）のＰポー）に分流したシステム圧力は、該弁（１
２λ）のＡポートを経て第１の油圧作動切換弁（１２ｔ
）の操作室α６コ）に入シ、操作ピストンａ０を更に左
側へ押圧する。Further, from the A boat of the first hydraulically operated switching valve (12/) to the check valve (to), the second hydraulically operated switching valve (12/) is connected.
The system pressure diverted to the valve (P port) of 22) is
2λ) through the A port of the first hydraulically operated switching valve (12t
) into the operation chamber α6) and press the operation piston a0 further to the left.

かかる一連の動作でしゃ断器（１）は投入動作を完了す
るが、その侵入動作の途中で投入用ソレノイド弁（５）
が消磁される。この消磁により弁（５）は復帰バネで右
側へ復帰し、第１の油圧作動切換弁（１２／）の操作室
（１６／）の圧油がタンクに戻るが、操作室（１６コ）
の圧油はそのまま保持されるから、操作ピストンａ０は
左側に移動したままとなる。すなわち、投入用ソレノイ
ド弁（５）の消磁にもかかわらず、しゃ断器（１）は投
入状態を保持し続ける。Through this series of operations, the breaker (1) completes the closing operation, but during the closing operation, the closing solenoid valve (5) closes.
is demagnetized. Due to this demagnetization, the valve (5) returns to the right side by the return spring, and the pressure oil in the operation chamber (16/) of the first hydraulically operated switching valve (12/) returns to the tank, but the pressure oil in the operation chamber (16/) returns to the tank.
Since the pressure oil is maintained as it is, the operating piston a0 remains moved to the left. That is, the breaker (1) continues to maintain the closed state even though the closing solenoid valve (5) is demagnetized.

次に、しゃ断器の上記投入状態におけるシステム圧力低
下時の回路動作を説明する。Next, a description will be given of the circuit operation when the system pressure decreases in the closed state of the breaker.

例えば、アキュムレーターａυと連結した圧力源（１７
１に油漏れ等が発生し、システム圧力が低圧すると、主
弁（３）の操作室（９）の圧力も低下するがポペット弁
ＱＯはバネ（至）の力で左側に保持されたままなので油
圧シリンダー（２）もその位置を保持する。For example, a pressure source (17
If an oil leak occurs in 1 and the system pressure becomes low, the pressure in the control chamber (9) of the main valve (3) will also drop, but the poppet valve QO will remain held to the left by the force of the spring. The hydraulic cylinder (2) also holds its position.

またシステム圧力が低下しても操作弁（４）の操作室（
１６ω内の圧力はチェック弁（イ）によって保持される
ので操作１７１７０時を左側に押した状態を保持し、低
圧ながら圧油を主弁（３）の操作室（９）に供給しつづ
ける。Also, even if the system pressure decreases, the operation chamber of the operation valve (4) (
Since the pressure within 16ω is maintained by the check valve (A), the state in which the operation 17170 is pushed to the left is maintained, and pressure oil continues to be supplied to the operation chamber (9) of the main valve (3), albeit at a low pressure.

一方、圧力感知素子に）の操作室（イ）内の圧力もシス
テム圧力の低圧とともに低下する。この為スプール弁（
イ）は強いバネ（２８０）によっで右側へ移動し、コー
ンスプール（２６イ）を押してＰポートとＡホートラ開
放して管路（Ｑ）と（ｂ）　［連通ずる。ディテント素
子（ハ）のスプール弁（イ）はポー／Ｉ／＠が溝（３６
／）内へ入っているので図示位置を保持し、Ｐボートと
Ａポートを開放しているので管路（°１と（〜も連通さ
れた状態を保持する。On the other hand, the pressure in the operation chamber (a) of the pressure sensing element (a) also decreases as the system pressure decreases. For this purpose, the spool valve (
A) is moved to the right by a strong spring (280), and the cone spool (26A) is pushed to open the P port and A hole to connect the conduit (Q) and (b). The spool valve (A) of the detent element (C) has a po/I/@ groove (36
/), so the position shown is maintained, and since the P boat and A port are open, the pipe line (°1 and (~) are also maintained in a state of communication.

以上の様にシステム圧力が低下してもしゃ断器（１）ハ
投入状態を保持し続ける。しかし油圧源αηの圧力低下
がつづきシステム圧力が完全に零°になると操作弁（４
）の第１油圧作動切換弁（１２／）の操作室（１６Ｊ）
の圧油は操作ピストンαＱの隙間から操作室（１６／）
をへてＲポートよシタンクへ、るるいハ第２油圧作動切
換弁（１２２）のポール弁（１０の隙間からそのＲボー
トよυタンクへと徐々に漏出する。その結果、操作室（
１６ω内の圧力は次第に低下しついに＆−ｊバネによシ
操作ピストンα０は右方向に押戻されてＰボートとＡボ
ート間はポール弁α枠によって閉止される。As described above, even if the system pressure decreases, the circuit breaker (1) continues to remain closed. However, if the pressure of the hydraulic source αη continues to decrease and the system pressure reaches completely zero, the control valve (4
) operation chamber (16J) of the first hydraulically operated switching valve (12/)
Pressure oil flows from the gap between the operating piston αQ to the operating chamber (16/)
From the R port to the tank, Ruruiha gradually leaks from the gap in the pole valve (10) of the second hydraulic operation switching valve (122) to the R port and the tank.As a result, the operation room (
The pressure in 16ω gradually decreases, and finally the &-j spring pushes the operation piston α0 back to the right, and the space between the P boat and the A boat is closed by the frame of the pawl valve α.

この時油圧シリンダー（２）のピストン両側に加わる圧
油ははｙ零で同じ圧力なのでピストン（２）ハ特別な外
力を加えないかぎりその投入位置を保持する。At this time, since the pressure oil applied to both sides of the piston of the hydraulic cylinder (2) is zero and the same pressure, the piston (2) maintains its closing position unless a special external force is applied.

そして、システム圧力の低下原因が解消され再びシステ
ム圧力が上昇し始めると、システム圧力に管路（０）よ
シ圧力感知素子（ハ）、管路Ｃｂ）、ディテント素子（
ハ）、管路（ａ）およびチェック弁（イ）を経て第１油
圧作動切換弁（１２／）の操作室（１６Ｊｌに導入され
る。Then, when the cause of the system pressure drop is resolved and the system pressure starts to rise again, the system pressure increases from pipe (0) to pressure sensing element (c), pipe Cb), detent element (
c), is introduced into the operation chamber (16Jl) of the first hydraulically operated switching valve (12/) via the pipe (a) and the check valve (a).

第２油圧作動切換弁（１２，２）のＡボートからＰポー
トを経て第１油圧作動切換弁（１２／）のＡボートから
Ｒホードへの油の流出はチェック弁（至）によシ阻止さ
れるので操作室（１６Ｊ）内の圧力が上昇し操作１７１
７０時は再び左側に移動させられ、油圧シリンダ（２）
の投入位＠をみだすことなく圧力油をＰボートからＡボ
ートを経て主弁（３）の操作室（９）へも供給する。The check valve (to) prevents oil from flowing from the A boat of the second hydraulically operated switching valve (12, 2) to the R port of the first hydraulically operated switching valve (12/) via the P port. As a result, the pressure in the operation chamber (16J) increases and operation 171
At 70 o'clock, it is moved to the left again and the hydraulic cylinder (2)
Pressure oil is also supplied from the P boat to the operation room (9) of the main valve (3) via the A boat without overflowing the injection position.

結局しゃ断器（１）はシステム圧力が低下し、零になっ
た後再上昇する過程において常に投入状態を保持しつづ
ける。同時に圧力感知素子（ハ）のコーン形ヌプール（
２６イ）もまた操作室（イ）内に溜るシステム圧力によ
って徐々に左方向へ復帰し、システム圧力が正常圧に回
復した時点で完全に元の左側位置に戻シ、スリーブ（ハ
）と操作室（イ）との接続口に圧着してＰボー）−Ａボ
ート間を閉止する。ヌプール（２６０）もまた元の左（
Ｉ１１位置に戻シ、Ｒボートを開放する。In the end, the breaker (1) always maintains the closed state during the process in which the system pressure decreases, reaches zero, and then rises again. At the same time, the pressure sensing element (c) has a cone-shaped nupuru (
26 A) also gradually returns to the left direction due to the system pressure accumulated in the operation chamber (A), and when the system pressure recovers to normal pressure, it completely returns to its original left position and operates with the sleeve (C). Crimp the connection port with the chamber (A) to close the connection between the P boat and the A boat. Nupur (260) is also the original left (
Return to the I11 position and release the R boat.

システム圧力が正常圧に回復する以前に、第１の油圧作
動切換：ｆＨｔ２．）の操作ピストン００もチェックＪ
「（イ）を経て操作室（１６，２）に送られるシステム
圧力によって完全に元の左側位置を保持し、閉止してい
たＰボート−Ａボート間が再び開放され、該弁（１２／
）を通してシステム圧力が主弁（３）の操作室（９）と
チェック弁α句を介する第２の油圧作動切換弁（１２，
２）を経て自らの操作室（１６ｊ）とに再び供給δれ、
操作ピストンθＱは更に左側へ押圧される。Before the system pressure recovers to normal pressure, the first hydraulic actuation switch: fHt2. ) also check the operation piston 00J
The valve (12/
) through which the system pressure is transferred to the control chamber (9) of the main valve (3) and the second hydraulically operated switching valve (12,
2) and is again supplied to its own operation room (16j).
The operating piston θQ is further pushed to the left.

従って、システム圧力の低下によってしゃ断状態となる
ことなく操作弁（４）の自己保持機構にその機能を回復
してしゃ断器の投入状態を保持し続ける。Therefore, the self-holding mechanism of the operation valve (4) recovers its function and continues to maintain the closed state of the breaker without becoming cut off due to a drop in system pressure.

しゃ断器（１）の投入状態をしゃ断状態に変更する場合
には、しゃ断用ソレノイド弁（６）を励磁する。When changing the on state of the breaker (1) to the cut off state, the cut off solenoid valve (6) is energized.

しゃ断用ソレノイド弁（６）を励磁すると、第２の油圧
作動切換弁（１２ａ）の操作室６２υとディテント素子
（ハ）の右側の操作室（８８０）とに圧油が供給される
。When the cutoff solenoid valve (6) is energized, pressure oil is supplied to the operation chamber 62υ of the second hydraulically operated switching valve (12a) and the right operation chamber (880) of the detent element (c).

ディテント素子（ハ）のスプール弁Ｏｚハ右側の操作室
（３３０）に供給された圧油によって左方向へ抑圧でれ
、その油圧力で溝（８６／）とポール（ロ）・・・との
嵌合が外れて左方向へ移動し、破線で示す前記左側位置
で溝（３６，２）とボール（ロ）・・・とが嵌合し、固
定でれる。The spool valve Oz of the detent element (c) is suppressed to the left by the pressure oil supplied to the operation chamber (330) on the right side, and the oil pressure causes the groove (86/) and the pole (b)... When the fitting is released, the ball moves to the left, and the groove (36, 2) and the ball (B) fit into each other at the left position indicated by the broken line, and are fixed.

すなわち、ヌプール弁０→が破線で示す左側位置に固定
されると、第１の油圧作動切換弁（１２／）の操作室（
１６コ）に通じる管路（ａ）はタンクに接続されて圧力
が零となシ、圧力感知素子（ハ）に通じる管路（ｂ）は
閉止てれるから、この状態でシステム圧力が低下し、再
度上列しても圧力感知素子（ハ）から供給δれるシステ
ム圧力は完全にしゃ断されており、第１の油圧作動切換
弁（１２／）の操作室（１６ａ）に影響することにない
。That is, when the Nupur valve 0→ is fixed at the left position shown by the broken line, the operation chamber (
The pipe (a) leading to the pressure sensing element (c) is connected to the tank and the pressure becomes zero, and the pipe (b) leading to the pressure sensing element (c) is closed, so the system pressure decreases in this state. Even if the system pressure is supplied to the upper row again, the system pressure supplied from the pressure sensing element (c) is completely cut off and will not affect the operation chamber (16a) of the first hydraulically operated switching valve (12/). .

一方・第２の油圧作動切換弁（１２ｐ）の操作ビヌト　
　、ン（イ）は操作室０υＩＣ供給された圧油によって
左側へ移動し、第１の油圧作動切換弁（１２／）の操作
室（１６，２）内の圧油をＡボー１−−Ｒボートを経て
一タンクに回収する。One side/second hydraulically actuated switching valve (12p) operation binuto
, N (a) moves to the left side by the pressure oil supplied to the operation chamber 0υIC, and transfers the pressure oil in the operation chamber (16, 2) of the first hydraulically operated switching valve (12/) to the A bow 1--R. It is collected in one tank via a boat.

すると、操作ピストン（１０がバネ力によシ右側に移動
して主弁（３）の操作室（９）内の圧油を第１の油圧作
動切換弁（１２／）のＡボート−Ｒボートを介してタン
クに回収する。Then, the operation piston (10) moves to the right side by the spring force and transfers the pressure oil in the operation chamber (9) of the main valve (3) to the A boat and R boat of the first hydraulically operated switching valve (12/). Collected into tank via.

これにともなって主弁（３）のポペット弁θＯがシリン
ダー（２）のボア側に蓄えられた圧油の圧力により、バ
ネ０１）の力に抗して右側へ急速に移動し、Ｒボートを
開いてシリンダー（２）ボア側の圧油をタンクに回収す
る。Along with this, the poppet valve θO of the main valve (3) rapidly moves to the right side against the force of spring 01) due to the pressure of the pressure oil stored in the bore side of the cylinder (2), causing the R boat to move. Open it and collect the pressure oil from the cylinder (2) bore side into the tank.

シリンダー（２）のロッド側にはアキュムレーター（ｌ
］）刀）ラノ圧油が常時供給されているので、ボア側の
圧油がタンクに回収されるとシリンダー（２）のビヌト
ン（２）が急速に右側へ移Ｗｉ！ＩＬ、これＶＣ連動し
てしゃ断器（１）の接触子（１）が投入位胎からしゃ同
位置に移動する。こうしてしゃ断動作が完了する。There is an accumulator (l) on the rod side of the cylinder (2).
]) Since Rano pressure oil is constantly supplied, when the pressure oil on the bore side is collected into the tank, the binuton (2) in the cylinder (2) rapidly moves to the right side Wi! Interlocking with IL and VC, the contact (1) of the breaker (1) moves from the insertion position to the same position. In this way, the shutoff operation is completed.

しゃ断動作が完了すると、シリンダー（２）のボア側は
大゛気圧になり、主弁（３）のポペットＱＯ＋）はバネ
（ト）の力で左側に復帰して主弁（３）のＡボートとＲ
ボートを閉じ、次の投入指令に備える。When the shutoff operation is completed, the bore side of the cylinder (2) becomes high pressure, and the poppet QO+ of the main valve (3) returns to the left side by the force of the spring (G), and the A boat of the main valve (3) and R
Close the boat and prepare for the next launch order.

以上に説明したとおり、本発明Ｖユ操作弁の側に自己保
持機構を備えたしゃ断器の油圧操作回路が、しゃ断器の
投入状態でシステム圧力が低下した場合にその自己保持
機能を失い、再びシステム圧力が上昇してもその圧力を
操作弁から主弁に供給することが不可能となる問題点を
、圧力源と操作弁とを結ぶ圧力感知素子とディテント素
子とチェック弁とを備えたバイパス管路を設け、該管路
にシステム圧力低下後の再上昇時の圧力を流すことによ
って操作弁の自己保持機能を回復させ、正常圧のシステ
ム圧力が主弁に供給嘔れるようにしたから、従来のよう
に複雑な構造のクタンプ装置を回路に組込む必要がない
。従って、油圧回路全体の構造が簡単となり、信頼性が
高まり、コストも低減する等の優れた効果が期待できる
。As explained above, the hydraulic operating circuit of a breaker equipped with a self-holding mechanism on the side of the V-operated valve of the present invention loses its self-holding function when the system pressure decreases while the breaker is closed, and the circuit breaker loses its self-holding function and restarts. A bypass equipped with a pressure sensing element, a detent element, and a check valve that connects the pressure source and the operating valve solves the problem that even if the system pressure increases, it is impossible to supply that pressure from the operating valve to the main valve. A conduit was provided, and the pressure when the system pressure rose again after the decrease was allowed to flow through the conduit, thereby restoring the self-holding function of the operating valve, so that the normal system pressure was supplied to the main valve. There is no need to incorporate a complex-structured stamping device into the circuit as in the past. Therefore, the structure of the entire hydraulic circuit is simplified, reliability is increased, and excellent effects such as cost reduction can be expected.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は操作弁に自己保持機構を備えた従来の油圧操作
回路を説明する要部回路図、第２図は本発明の油圧操作
回路を説明する回路図である。 １：しゃ断器、２：油圧シリンダー、８：主弁、４：操
作弁、５：投入用ソレノイド弁、６：しゃ所用ソレノイ
ド弁、１８，２２：チェック弁、２３：圧力感知素子、
２４：デイデント素子出願人　　住友精密工業株式会社 出願人　日新電機株式会社 代理人弁理士　生　形　元　重 Ｌ　　−、、，１FIG. 1 is a main part circuit diagram illustrating a conventional hydraulic operating circuit in which an operating valve is provided with a self-holding mechanism, and FIG. 2 is a circuit diagram illustrating a hydraulic operating circuit according to the present invention. 1: Breaker, 2: Hydraulic cylinder, 8: Main valve, 4: Operation valve, 5: Closing solenoid valve, 6: Shut-off solenoid valve, 18, 22: Check valve, 23: Pressure sensing element,
24: Dedent device applicant Sumitomo Precision Industries Co., Ltd. Applicant Nissin Electric Co., Ltd. Patent attorney Representative Shige L. -,,,1

Claims (1)

【特許請求の範囲】[Claims] （１）シゃ断器（１）を操作する油圧シリンダー（２）
と、該油圧シリンダーに操作用の圧油を送る主弁（３）
と、第１の油圧作動切換弁（１２／）および第２の油圧
作動切換弁（１２ｘ）とを有し、前記主弁に操作用の圧
油を送る操作弁（４）とで構成δれるしゃ断器の油圧操
作回路において、・前記第１の油圧作動切換弁（１２／
）に２つの操作室（１６１）（１６，２）を設け、その
一方の操作室（１６／）に投入用ソレノイド弁（５）か
らの油圧管路を接続し、他方の操作室（１６，２）には
前記主弁（３）に至る油圧前略の分岐管をしゃ所用ソレ
ノイＦブ「（６）からの油圧管路に接続・された第２の
油圧作動切換弁（１２，２）を介して接続するとともに
、ヌプールヅｆＯ邊を有し、該スプール弁にその開閉状
態を機械的に保持する機構を設けたディテント素子（ハ
）のＯ１Ｊ記弁０埠の開放用操作室（８３イ）と投入用
ソ、レノイド弁（５）を、弁０カの閉止用操作室（３３
０）としゃ新月ソレノイド弁（６）とを夫々油圧管路で
結び、δらに低圧時のみ管路を開く圧力感知素子（至）
と前記ディテント素子（ハ）とを経てシステム油圧管路
を前記第１の油圧作動切換弁（１２／）の操作室（１６
２）に接続し、該ディテント素子（ハ）から第１の油圧
作動切換弁（１２／）の操作室（１６，２）ヘノ管路お
よび前記主弁（３）ｖｒｃ。 至る油圧管路の分岐管の第２の油圧作動切換弁（１２，
２）に至る管路に夫々チェック弁（イ）θ８）を設けた
ことを特徴とするしゃ断器の油圧操作回路。(1) Hydraulic cylinder (2) that operates the breaker (1)
and a main valve (3) that sends operating pressure oil to the hydraulic cylinder.
and an operation valve (4) which has a first hydraulically operated switching valve (12/) and a second hydraulically operated switching valve (12x) and sends pressure oil for operation to the main valve. In the hydraulic operation circuit of the circuit breaker, - the first hydraulically operated switching valve (12/
) are provided with two operation chambers (161) (16,2), one of which is connected to the hydraulic line from the closing solenoid valve (5), and the other operation chamber (16, 2) has a second hydraulically operated switching valve (12, 2) connected to the hydraulic line from the solenoid F valve (6) which is used to shut off the branch pipe leading to the main valve (3). An operation chamber (83a) for opening the O1J valve of the detent element (c), which is connected through the spool valve and has a mechanism for mechanically holding the spool valve in its open/closed state. and the closing valve (33) for closing the valve (0).
0) and Shashingetsu solenoid valve (6) are connected through hydraulic lines, and δ and others are connected to a pressure sensing element (to) that opens the line only when the pressure is low.
and the detent element (c), the system hydraulic line is connected to the operation chamber (16) of the first hydraulically operated switching valve (12/).
2), and connects the detent element (c) to the control chamber (16, 2) heno conduit of the first hydraulically operated switching valve (12/) and the main valve (3) vrc. A second hydraulically operated switching valve (12,
2) A hydraulic operation circuit for a circuit breaker, characterized in that check valves (a) and θ8) are provided in each of the pipelines leading to the breaker.