KR20250161223A - Dual-pressure gas insulated switchgear - Google Patents

Abstract

The present invention is a dual-pressure gas-insulated circuit breaker. In the present invention, a separate external gas tank (43) is provided outside the outer case (10). The insulating gas provided from the external gas tank (43) is relatively high pressure compared to the insulating gas inside the outer case (10). The insulating gas provided from the external gas tank (43) is used to extinguish an arc by opening and closing a valve (50). A driving force for moving an electrode is used to open and close the valve (50). The driving force provided from the actuator (30) is sent to the second arc electrode (223), and as the second arc electrode (223) moves, the driving force for opening and closing the valve (50) is transmitted through the valve control link mechanism (250). The above valve (50) has a pilot part (510), and the pilot part (510) is operated by the operation of a cam (540) to open and close the valve (50).

Description

Dual-pressure gas insulated switchgear

The present invention relates to a dual pressure gas insulated circuit breaker.

As the use of _SF6 , a gas with a high global warming potential (GWP), is being regulated, gas-insulated circuit breakers are also preparing to use eco-friendly gases to maintain insulation. However, natural gas, one of the eco-friendly gases, has only 40% the insulation performance of _SF6 . To compensate for this, gas pressure is either higher than that of _SF6 or the enclosure size is increased to secure insulation distances between components.

Therefore, it may be more advantageous to use a dual pressure method that can further increase the pressure of the eco-friendly gas for extinguishing rather than the puffer method or composite extinguishing method used in circuit breakers using SF ₆ .

Conventional dual-pressure gas-insulated circuit breakers have an external gas tank that supplies high-pressure gas separately outside the housing containing the circuit breaker. The pressure of the insulating gas inside the housing is relatively lower than that of the external gas tank. The external gas tank is filled with high-pressure insulating gas for arc extinguishing, and the insulating gas is injected when the contacts open during circuit breaker operation to extinguish the arc.

However, conventional dual-pressure gas circuit breakers have a problem in that it is difficult to precisely control the timing of injecting insulating gas for protection.

In addition, since a large amount of insulating gas is injected for a long time in a conventional dual-pressure gas circuit breaker, the pressure loss in the external gas tank is large, and it is necessary to precisely control the injection of insulating gas from the external gas tank for protection.

PCT Publication WO2013/175565 Korean Patent Publication No. 10-2016-0081569 U.S. Patent No. US 9627155

The purpose of the present invention is to solve the problems of the prior art as described above, and to provide gas for Soho at an accurate time.

An object of the present invention is to operate a valve for supplying gas from an external gas tank to the interior of an outer case by a driving force provided by a manipulator.

An object of the present invention is to link the operation of a valve control linkage mechanism for operating a valve for discharging gas with the operation of a first electrode and a second electrode operated by an actuator.

The purpose of the present invention is to supply gas from an external gas tank located outside the enclosure to the interior of the enclosure by using a valve installed inside the enclosure.

The purpose of the present invention is to guide gas delivered from an external gas tank to a designated location through the interior of a second electrode.

The purpose of the present invention is to open and close a valve by driving a cam with a driving force transmitted by a valve control link mechanism.

An object of the present invention is to minimize the movement of a linkage part during reverse rotation of a cam for opening and closing a valve.

The purpose of the present invention is to mechanically set the start and end points of gas injection for extinguishing an arc.

The purpose of the present invention is to provide a dual-pressure gas-insulated circuit breaker that uses environmentally friendly gas as an insulating gas.

In order to achieve the above-described purpose, the dual-pressure gas-insulated circuit breaker of the present invention may include an enclosure having an internal space formed therein and filled with insulating gas, a circuit breaker installed inside the enclosure and including a first arc electrode and a second arc electrode and blocking current flow when an abnormal current occurs, an actuator providing driving force for the operation of the circuit breaker, an external gas tank installed outside the enclosure and providing a relatively high-pressure insulating gas to the interior of the enclosure through a valve for extinguishing an arc occurring between the first arc electrode and the second arc electrode, and a valve opening/closing control mechanism for opening and closing the valve using the driving force provided from the actuator.

The first arc electrode and the second arc electrode can be operated in opposite directions by a driving force provided from the actuator.

The first arc electrode can be reciprocated in a straight line by the operating lever of the operating device, and the second arc electrode can receive the driving force provided by the operating lever through the dual motion lever and the linkage lever to drive the valve opening/closing control mechanism.

The above-mentioned linkage lever is connected to the nozzle of the second arc electrode and can move the second arc electrode linearly back and forth.

The above valve is installed inside the outer case and can be connected to the external gas tank through a connecting pipe penetrating the outer case.

Based on the above-mentioned case, the actuator and the external gas tank can be installed in opposite positions.

The second arc electrode has a movable pipe that moves relative to a fixed pipe through which insulating gas discharged from the valve flows, and the insulating gas transmitted through the fixed pipe by penetrating the inside of the movable pipe can be transmitted to the nozzle of the second arc electrode and discharged to extinguish the arc.

The above valve opening/closing control mechanism may include a linkage rod that moves linearly reciprocally together with the second arc electrode, a linkage link that is connected to the linkage rod and operates, and a driving lever that is rotatable relative to the linkage link and transmits a driving force for opening/closing the valve.

The above linkage load can be guided in movement by a guide installed within the above enclosure.

The above-mentioned linkage rod can be moved together with the moving pipe of the second arc electrode.

In the present invention, the opening operation (b) of the valve can be performed between 2 ms and 40 ms after the contact operation.

In the present invention, the opening operation (B) of the valve can be performed between 0 and 20% of the contact opening stroke.

In the present invention, the closing operation (d) of the valve can be performed between 17.5 ms and 72 ms after the contact operation.

The closing action (D) of the above valve can be performed between 70 and 100% of the contact opening stroke.

According to another feature of the present invention, the present invention may include an enclosure having an internal space formed therein and filled with insulating gas, a blocking unit installed inside the enclosure and including a first arc electrode and a second arc electrode and blocking current flow when an abnormal current occurs, an actuator providing driving force for the operation of the blocking unit, an external gas tank installed outside the enclosure and providing relatively high-pressure insulating gas for extinguishing an arc occurring between the first arc electrode and the second arc electrode, and a valve that is opened and closed by a valve opening and closing mechanism unit to control the transfer of the insulating gas of the external gas tank into the interior of the enclosure.

The above valve has a valve main passage formed inside the valve body to discharge insulating gas, and may include a pilot section driven by the valve opening/closing mechanism section that receives driving force for driving the first arc electrode and the second arc electrode through a valve control link mechanism to open and close the valve main passage.

The above valve opening/closing mechanism may include a cam that is rotated by the valve control link mechanism, a latch that is rotated by a predetermined angle by the rotation of the cam, and a roller lever that is rotated by a predetermined angle about the center of rotation so that a free end is caught or separated from the latch and drives the pilot unit.

The cam may include a cam body, a cap shaft that serves as a center of rotation of the cam body, and first and second projections that protrude from the cam body at a predetermined angular interval and are linked with the latch and roller lever.

The cam includes a cam body, a camshaft that serves as the center of rotation of the cam body, and a first projection arm and a second projection arm that protrude from the cam body at a predetermined angle and are linked with the latch and the roller lever, and the first projection arm is supported by an elastic member and may have a tendency to rotate in the direction of the latch.

A gas compressor may be further provided to compress and send the insulating gas from the outer case to the external gas tank through the above connecting pipe.

Connecting pipes are provided between the external gas tank and the valve, and a filter may be installed between the connecting pipe and the external gas tank.

The above pilot part may include a pilot body having a pilot internal space formed therein, a communication path connecting the connecting pipe and the valve main path in the pilot internal space, a pilot stem supported and installed by an elastic member to open and close the communication path, and a push rod that is driven by the valve opening/closing mechanism to drive the pilot part and open and close the communication path.

The inner space of the above pilot is further provided with a drain hole that is connected to the inner space of the outer case, and the drain hole can be opened and closed by an opening and closing piston formed on the push rod.

A push finger for driving the pilot stem may be provided at the tip of the above push rod.

The dual pressure gas insulated circuit breaker according to the present invention may have at least one of the following effects.

In the present invention, gas for extinguishing an arc occurring between the first and second electrodes is supplied from an external gas tank located outside the enclosure. At this time, since the configuration for supplying gas from the external gas tank to the enclosure is mechanically configured to receive power by driving the first and second electrodes, gas for extinguishing can be supplied at an accurate time, thereby reliably eliminating the arc.

In the present invention, the valve opening and closing operation is performed using driving force provided by an actuator that provides driving force for the separation of the first and second electrodes. Accordingly, the valve opening and closing operation and the operation of the first and second electrodes can be interlocked, thereby enabling accurate and reliable extinguishing of arcs generated when the first and second electrodes are separated.

In the present invention, the valve is opened and closed by the operation of a valve control linkage mechanism that is linked to the operations of the first and second electrodes. That is, the valve control linkage mechanism operates by the actuation of the second electrode, thereby performing the valve opening and closing operation. Accordingly, power is accurately transmitted from the second electrode to the valve by the valve control linkage mechanism, enabling the valve to be opened and closed accurately.

In the present invention, a valve that discharges gas delivered from an external gas tank located outside the housing into the housing is located within the housing and is actuated by a valve control linkage mechanism. Therefore, only the pipe connecting the external gas tank and the valve passes through the housing. Consequently, since the portion penetrating the housing is a pipe, not a linkage mechanism, there is also the advantage of preventing problems such as leakage from the housing.

In the present invention, gas discharged from the valve is delivered to the designated position through a guide pipe that guides the movement of the second electrode while penetrating the interior of the second electrode. Therefore, the structure for delivering the gas discharged from the valve is simplified.

The valve used in the present invention has its opening point, opening time, and closing point determined by a cam rotated by a cam drive lever constituting a valve control linkage mechanism. Accordingly, the opening and closing operation of the valve is controlled by the cam, resulting in more precise valve opening and closing operation.

According to one embodiment of the present invention, a driving projection provided on a cam is supported by a spring and interlocked with a counterpart latch. Accordingly, while interlocking with the latch occurs during the opening operation, it is not interlocked during the closing operation, thereby effectively establishing the closed state of the valve without affecting the movement of the interlocking components affected by the movement of the latch.

In the present invention, the opening and closing timing of the valve can be controlled by setting the position of the cam's driving protrusions. Therefore, by adjusting the position of the driving protrusions and the gap between the driving protrusions, the gas injection start and end times for arc extinguishing can be more precisely set.

In the present invention, insulating gas with a higher pressure than the insulating gas within the enclosure can be supplied from an external gas tank to the enclosure for arc extinguishing. Therefore, insulating gas with a relatively high pressure can be used to extinguish the arc instead of the insulating gas with a relatively low pressure within the enclosure. Consequently, even when using an eco-friendly gas as the insulating gas, the low blocking performance of the eco-friendly gas can be compensated for. Therefore, the present invention can be effectively applied to gas-insulated circuit breakers that use eco-friendly gas.

In the present invention, a pilot unit is provided on a valve that injects insulating gas from an external gas tank into the enclosure. By providing a pilot unit in this manner, the pilot unit can be operated with a small operating force, enabling the discharge of insulating gas through a relatively large discharge area. Consequently, a large amount of insulating gas can be discharged with a relatively small operating force.

Fig. 1 is a schematic diagram showing the configuration of a preferred embodiment of a dual pressure gas-insulated circuit breaker according to the present invention.
Figure 2 is a schematic cross-sectional view showing an important part of a blocking part of an embodiment of the present invention.
Figure 3 is a schematic cross-sectional view showing the first arc electrode and the second arc electrode constituting an embodiment of the present invention and the connection structure therebetween.
Figure 4 is a configuration diagram showing the connection between a valve control link mechanism and a valve constituting an embodiment of the present invention.
Fig. 5 is a perspective view showing an example of the external configuration of a valve constituting an embodiment of the present invention.
Fig. 6 is a cross-sectional view taken along line 6-6' of Fig. 5.
Fig. 7 is a cross-sectional view taken along line 7-7' of Fig. 5.
Fig. 8 is a cross-sectional view showing another embodiment of the valve opening/closing mechanism of the present invention.
Figure 9 is an operational state diagram showing that the first arc electrode and the second arc electrode are interconnected in an embodiment of the present invention.
Figure 10 is an operating state diagram showing the operation of a valve control link mechanism in an embodiment of the present invention.
Figures 11 to 17 are operation state diagrams sequentially showing the operation of the valve from opening to closing during the blocking operation of the circuit breaker in an embodiment of the present invention.
Figures 18 to 20 are operation state diagrams sequentially showing the operation of the valve opening/closing mechanism and the valve when the circuit breaker is turned on in an embodiment of the present invention.
Figures 21 to 23 are operation state diagrams sequentially showing the operation of the valve opening/closing mechanism and the valve when the circuit breaker is turned on, according to another embodiment of the valve opening/closing mechanism of the present invention.
Figure 24 is a graph showing the contact operation stroke and valve operation timing in an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components will be given the same reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments of the present invention, if a detailed description of a related known structure or function is deemed to hinder understanding of the embodiments of the present invention, such detailed description will be omitted.

Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of embodiments of the present invention. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not limited by the terms. When it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other component, but another component may also be "connected," "coupled," or "connected" between each component.

The configuration of a gas-insulated switch according to an embodiment of the present invention will be described with reference to the drawings. First, the gas-insulated switch according to the present invention can use an environmentally friendly gas as an insulating gas. For example, air, CO _{2 ,} N ₂ , O ₂ and a mixed gas thereof can be used as a medium for blocking and insulating. The insulating gas used in the present invention is not limited to those mentioned above, and various environmentally friendly gases can be used. In addition, the pressure at which the insulating gas used in the present invention is injected through the valve (50) described below is between 20 bar and 100 bar.

The gas-insulated circuit breaker of the present invention has an outer case (10). An inner space (12) is formed inside the outer case (10), and a circuit breaker (20) and various components can be provided therein. The inner space (12) of the outer case (10) is filled with an environmentally friendly gas to perform insulation.

A blocking unit (20) is provided inside the outer case (10). An actuator (30) for controlling the operation of the blocking unit (20) may be provided on one outer side of the outer case (10). A gas control unit (40) is provided on the other outer side of the outer case (10). The actuator (30) and the gas control unit (40) may be located at opposite positions with respect to the outer case (10). When the actuator (30) and the gas control unit (40) are arranged in this manner, the shock of the electrodes being operated by the actuator (30) is not transmitted to the gas control unit (40), and it is easy to secure space according to the capacity of the external gas tank (43) constituting the gas control unit (40).

The insulating gas provided from the above gas control unit (40) performs the function of extinguishing the arc. The insulating gas provided from the above gas control unit (40) is controlled by the valve (50) to be delivered to the inner space (12) of the outer case (10).

The configuration of the blocking unit (20) provided inside the above-mentioned outer case (10) is described. The blocking unit (20) functions to block the line when an abnormal current occurs in the line through which high voltage is transmitted. For this purpose, the blocking unit (20) has a first main electrode (210) and a second main electrode (220). The first main electrode (210) and the second main electrode (220) can be in contact with each other to perform an electrical connection. The first main electrode (210) and the second main electrode (220) can move relative to each other. For example, the first main electrode (210) and the second main electrode (220) can each move, or either the first main electrode (210) or the second main electrode (220) can move. In this embodiment, the first main electrode (210) may be movable, and the second main electrode (220) may be fixed.

The first main electrode (210) may have an approximately cylindrical shape. A first internal space (211) is formed inside the first main electrode (210). A first arc electrode (213) is provided in the first internal space (211). The first arc electrode (213) contacts and is separated from the second arc electrode (223) to be described below. When the first arc electrode (213) and the second arc electrode (213) contact each other, they come into contact before the first main electrode (210) and the second main electrode (220), and when they are separated, they are separated after the first main electrode (210) and the second main electrode (220). By doing so, an arc is generated only at the first arc electrode (213) and the second arc electrode (223).

The first arc electrode (213) is a rod-shaped piece having a predetermined length and is made of a material having good electrical conductivity. The first arc electrode (213) can be moved back and forth in a straight line by an operating lever (32) that provides the operating force of the operating device (30). By moving the first arc electrode (213) in a straight line, contact and separation between the first arc electrode (213) and the second arc electrode (223) can be achieved.

The second main electrode (220) may also have a roughly cylindrical shape. A second internal space (221) is formed inside the second main electrode (220). A second arc electrode (223) is provided inside the second main electrode (220). The second arc electrode (223) has a cylindrical shape into which the first arc electrode (213) can be inserted. The outer surface of the first arc electrode (213) may be in contact with the inner surface of the second arc electrode (223). An electrode penetration passage (223') may be formed by penetrating the interior of the second arc electrode (223) in the longitudinal direction. The insulating gas flowing through the electrode penetration passage (223') of the second arc electrode (223) is delivered to a nozzle (225) to be described below. The above second arc electrode (223) may be positioned inside the inlet of the nozzle (225) to be described below.

The second arc electrode (223) is provided with a nozzle (225). The nozzle (225) is a portion through which gas for extinguishing the arc is discharged. The nozzle (225) is configured such that the internal flow cross-sectional area thereof gradually increases as it moves toward the free end, which is the outlet. The front portion of the second arc electrode (223) is located inside the inlet of the nozzle (225).

A moving pipe (226) is connected to the rear portion of the second arc electrode (223). The moving pipe (226) moves together with the second arc electrode (223) and the nozzle (225). Insulating gas is delivered to the electrode penetration path (223') of the second arc electrode (223) through the moving pipe (226). The moving pipe (226) is straight and has a predetermined length.

The second main electrode (220) may have a fixed pipe (227) inside. The fixed pipe (227) is connected to the valve (50) to allow the insulating gas discharged from the valve (50) to flow. The movable pipe (226) is movable relative to the fixed pipe (227). In the present embodiment, the outer surface of the fixed pipe (227) is slidably positioned on the inner surface of the movable pipe (226). Therefore, the movable pipe (226) is movable relative to the fixed pipe (227). The movable pipe (226) and the fixed pipe (227) always overlap each other in a predetermined section, so that the insulating gas can be transmitted between the movable pipe (226) and the fixed pipe (227) without leakage. For example, in the present embodiment, when the first arc electrode (213) and the second arc electrode (223) are separated, the overlapping length of the movable pipe (226) and the fixed pipe (227) can be the longest. That is, when the first arc electrode (213) and the second arc electrode (223) are in contact with each other, the overlapping length of the movable pipe (226) and the fixed pipe (227) can be the shortest.

Meanwhile, the driving force of the actuator (30) is transmitted by the operating lever (32). The operating lever (32) is located inside the outer case (10), so that the operating lever (32) can directly penetrate the outer case (10) to receive the driving force of the actuator (30) located outside the outer case (10). Of course, a separate component can also penetrate the outer case (10) and transmit the driving force to the operating lever (32) while making a linear reciprocating motion. The driving force provided from the actuator (30) is transmitted to the operating lever (32), and the first arc electrode (213) can be linearly reciprocated by the operating lever (32).

There is a dual motion lever (230) linked to the above-mentioned operating lever (32). One side of the dual motion lever (230) is connected to the operating lever (32) so as to be relatively rotatable. The other side of the dual motion lever (230) may be connected to a nozzle linkage lever (240). The dual motion lever (230) may be rotated around a rotation center pin (230'). The rotation center pin (230') may be installed on one side of the first main electrode (210). The dual motion lever (230) is connected to the operating lever (32) so as to be relatively rotatable by a first connection pin (231). The dual motion lever (230) may be connected to the linkage lever (240) so as to be relatively rotatable by a second connection pin (232).

The above-mentioned linkage lever (240) is, in this embodiment, connected to the nozzle (225) and the connecting pin (241) so as to be relatively rotatable. The linkage lever (240) does not necessarily have to be connected to the nozzle (225) so as to be relatively rotatable. The linkage lever (240) may be connected to the second arc electrode (223) so as to be rotatable. The linkage lever (240) transmits the driving force from the actuator (30) side or the driving force from the first arc electrode (213) side so as to be ultimately used for opening and closing the valve, which will be described below. In this embodiment, the linkage lever (240) is connected to the nozzle (225) by the connecting pin (241). Therefore, the nozzle (225) is operated together by the movement of the linkage lever (240).

Meanwhile, there is a valve control link mechanism (250) that operates together with the movement of the second arc electrode (223), nozzle (225), moving pipe (226), etc. The valve control link mechanism (250) provides the driving force required for the operation to open and close the valve (50). In particular, the valve control link mechanism (250) is operated by the driving force from the actuator (30). The valve control link mechanism (250) receives the driving force from the actuator (30) through the second arc electrode (223). For reference, the second arc electrode (223) moves in opposite directions in conjunction with the operation of the first arc electrode (213), and by this operation, the operation of the circuit breaker (20) can occur more quickly.

And, as in the present invention, when the driving force transmitted through the second arc electrode (223) is transmitted to the valve (50) using the valve control link mechanism (250), the opening and closing timing of the valve (50) can be set more accurately. This is because the valve control link mechanism (250) has a mechanical configuration. That is, the valve control link mechanism (250) operates in conjunction with the contact and separation operations of the first arc electrode (213) and the second arc electrode (223) where an arc is generated.

The above valve control link mechanism (250) has a linkage rod (252). The linkage rod (252) is connected to the moving pipe (226). The linkage rod (252) moves together in the moving direction of the moving pipe (226). That is, the linkage rod (252) also moves in the longitudinal direction of the moving pipe (226). In other words, the linkage rod (252) performs a linear reciprocating motion together with the moving pipe (226). A guide (253) is used to accurately set the moving path of the linkage rod (252). The linkage rod (252) passes through the guide (253).

There is a connecting link (254) connected to one end of the above-mentioned linkage rod (252). The connecting link (254) can operate together with the linkage rod (252). Of course, the linkage rod (252) and the connecting link (254) may not be connected, and the cam drive lever (256) described below may be directly connected to the linkage rod (252).

The cam drive lever (256) is connected to one side of the valve (50) and serves to transmit the driving force of the valve control link mechanism (250) to the cam (540) of the valve (50). The cam drive lever (256) serves to rotate the cam (540) of the valve (50) forward and reversely by a predetermined angle. One side of the cam drive lever (356) may not be connected to the connecting link (254) but may be directly connected to the linkage rod (252). Of course, in this case, there must be a hole in the configuration in which the cam drive lever (256) and the linkage rod (252) are connected in order to match the rotational path according to the rotational motion of the cam drive lever (256).

Meanwhile, on the opposite side of the actuator (30) in the outer case (10), there is a gas control unit (40). The exterior of the gas control unit (40) may be formed by an outer housing (41). An external gas tank (43) may be located inside the outer housing (41). Of course, the external gas tank (43) may be positioned adjacent to the outer case (10) without the outer housing (41).

There is a gas compressor (45) on one side of the inside of the outer housing (41). The gas compressor (45) sets the pressure of the insulating gas stored in the outer gas tank (43). The insulating gas delivered from the inside of the outer case (10) is delivered to the gas compressor (45) and compressed. A filter (47) may be provided between the outer case (10) and the gas compressor (45). The filter (47) in the connecting pipe (not given a drawing symbol) (see FIG. 1) connecting the outer case (10) and the gas compressor (45) serves to remove foreign substances contained in the insulating gas. The filter (47) may also be provided on the path from the outer gas tank (43) to the valve (50). That is, the filter (47) may be present in the connecting pipe (49) connecting the external gas tank (43) and the valve (50) described below. The connecting pipe (49) transfers the insulating gas in the external gas tank (43) to the valve (50) located inside the outer case (10).

Next, the configuration of the valve (50) will be described. The valve (50) is located inside the outer case (10). Since the valve (50) is located inside the outer case (10), the valve control mechanism (250) for opening and closing the valve (50) does not need to penetrate the outer case (10). Accordingly, a leakage problem in the outer case (10) does not occur.

The configuration of the above valve (50) is well illustrated in FIGS. 5 to 7. The skeleton of the valve (50) is formed by a valve body (500). The valve body (500) may, for example, have a hexahedral block shape. The valve body (500) may also be configured by connecting multiple blocks. The valve body (500) may have multiple components that constitute the valve body (500).

A valve main passage (502) may be formed inside the valve body (500). A valve stem (504) is provided in the valve main passage (502). A first disc (506) is provided at one end of the valve stem (504). A second disc (508) is provided at the other end of the valve stem (504). The first disc (506) can open and close a portion through which insulating gas enters the inside of the valve main passage (502). The second disc (508) can open and close a portion through which insulating gas is discharged from the valve main passage (502) to the outside. In the present embodiment, an area on which the pressure of the insulating gas is applied to the first disc (506) is larger than an area on which the pressure of the insulating gas is applied to the second disc (508). That is, the first disk (506) is larger than the second disk (508).

The above valve stem (504) and the first disc (506) and the second disc (508) operate as one unit. The valve stem (504) has a substantially cylindrical shape, and the first disc (506) and the second disc (508) each have a circular plate shape. Here, the elastic force of the elastic member (504') acts on the valve stem (504). The elastic force of the elastic member (504') acts to move the valve stem (504) to the left with reference to FIG. 6. For reference, the elastic member (504') is only shown in FIG. 6 for convenience.

On one side of the valve body (500), there is a connecting block (509). A connecting passage (509') is formed inside the connecting block (509). The connecting passage (509') connects the valve main passage (502) and the connecting pipe (49), i.e., the external gas tank (43). Therefore, the pressure of the insulating gas in the external gas tank (43) is always maintained in the valve main passage (502). For reference, the pressure of the insulating gas inside the outer case (10) is relatively low, and the pressure of the insulating gas in the external gas tank (43) is relatively high. Accordingly, the relatively high pressure of the external gas tank (43) is acting on the inside of the valve main passage (502), and since the hydraulic pressure surface of the first disc (506) is wider than the hydraulic pressure surface of the second disc (508), the first disc (506) closes the valve main passage (502). That is, the first disc (506) closes the communication passage (514). At this time, the second disc (508) also closes the valve main passage (502).

There is a pilot part (510) to drive the above valve (50). The pilot part (510) is a component of the valve (50). As the pressure applied to the first disk (506) and the second disk (508) of the valve stem (504) changes due to the operation of the pilot part (510), the valve main passage (502) is opened and closed, so that the supply of insulating gas can be controlled.

The skeleton of the above pilot section (510) is formed by a pilot body (512). A pilot internal space (513) is formed inside the pilot body (512). A drain hole (513') is formed on one side of the pilot internal space (513). The drain hole (513') connects the pilot internal space (513) and the outer case internal space (12) of the outer case (10).

There is a communication passage (514) penetrating the pilot body (512). The communication passage (514) communicates between the valve main passage (502) and the external gas tank (43). More precisely, the communication passage (514) communicates between the connecting pipe (49) and the valve main passage (502). The opening and closing operation of the valve (50) is performed by opening and closing the communication passage (514).

On one side of the pilot internal space (513) is a pilot stem (516). One side of the pilot stem (516) serves to open and close the communication passage (514). The pilot stem (516) is supported by an elastic member (516'). The elastic member (516') provides elastic force to the pilot stem (516) in a direction that closes the communication passage (514).

In order to operate the pilot stem (516) while overcoming the elastic force of the elastic member (516') acting on the pilot stem (516), a push rod (518) is provided in the pilot internal space (513). The push rod (518) is driven by a driving force transmitted through the valve control link mechanism (250). The push rod (518) receives an elastic force from the elastic member (518'). The elastic member (518') provides an elastic force in a direction in which the push rod (518) moves away from the pilot stem (516).

The above push rod (518) is integrally provided with an opening/closing piston (520). The opening/closing piston (520) serves to open/close the drain hole (513'). The push rod (518) and the opening/closing piston (520) may be manufactured separately, but operate as one unit.

The above push rod (518) has a push finger (522). The push finger (522) protrudes from the opening/closing piston (520) toward the pilot stem (516). The push finger (522) pushes the pilot stem (516) to overcome elasticity and move the pilot stem (516). In other words, it functions to move the pilot stem (516) and open the communication passage (514).

The opening/closing piston (520) formed on the above push rod (518) has a relatively large outer diameter compared to other parts of the push rod (518). The push finger (522) has a relatively smaller outer diameter than the opening/closing piston (520).

The above valve (50) has a valve opening/closing mechanism (530). The valve opening/closing mechanism (530) is operated by receiving driving force through the cam driving lever (256) of the valve control link mechanism (250). The valve opening/closing mechanism (530) includes a cam (540), a latch (550), and a roller lever (560).

The cam (540) is rotatably installed on one side of the valve (50), for example, one side of the valve body (500), or on a plate (501: see FIG. 5) provided on the valve body (500). The cam (540) is coupled with the cam driving lever (256) and is rotated by the cam driving lever (256). The cam body (542) forms the skeleton of the cam (540). A camshaft (543) protrudes from the center of rotation of the cam body (542). The cam driving lever (256) is coupled to the camshaft (543).

The cam body (542) has a first protrusion (544) and a second protrusion (546) protruding from it. The protruding positions of the first protrusion (544) and the second protrusion (546) are related to the opening and closing time of the valve (50). The angle between the first protrusion (544) and the second protrusion (546) is related to the opening time of the valve (50). In the illustrated embodiment, the angle between the first protrusion (544) and the second protrusion (546) is set to be approximately 90 degrees. However, the angle between the first protrusion (544) and the second protrusion (546) may vary depending on the opening time of the valve (50).

There is a latch (550) on one side of the valve body (500) or one side of the plate (501). The latch (550) can rotate around a center of rotation (550'). The latch (550) has a tendency to rotate clockwise with respect to FIG. 6 due to an elastic member (550"). That is, the latch (550) has a tendency to rotate in a direction such that it is engaged with the roller lever (560). The elastic member (550") is shown only in FIG. 6 for convenience.

One side of the above latch (550) may have a hook (552). The free end of the roller lever (560) may be hooked onto the hook (552).

The roller lever (560) may be installed on one side of the valve body (500) or one side of the plate (501). The roller lever (560) may also be rotated by a predetermined angle around a rotation center (560'). The roller lever (560) is connected to the push rod (518). Therefore, as the roller lever (560) is rotated by a predetermined angle, the push rod (518) may move in a straight line.

There is a roller (562) on the free end of the roller lever (560). The roller (562) functions to operate without interference with the first protrusion (544) and the second protrusion (546) of the cam (540). That is, the first protrusion (544) or the second protrusion (546) is guided by the roller (562) so as not to interfere with the roller lever (560).

Meanwhile, FIG. 8 illustrates another example of the valve opening/closing mechanism (530) described above. The valve opening/closing mechanism (530) presented here has a different configuration from the valve opening/closing mechanism (530) described above in that it has a cam (540'). The cam (540') has a first protrusion arm (544') instead of the first protrusion (544) of the above embodiment. The first protrusion arm (544') is configured to be rotatable at a predetermined angle around a rotation center (544") on the cam body (542). The first protrusion arm (544') extends to both ends around the rotation center (544"). An elastic member (545) is positioned between the cam body (542) and the portion extending to one side.

Accordingly, the first protrusion arm (544') is rotated by the elastic force provided by the elastic member (545) and the linkage with the latch (550). In this way, by operating the first protrusion arm (544'), the latch (550) and the parts connected thereto can be prevented from moving by the operation of the cam (540') at the end of the valve (50) closing operation. In other words, the parts of the pilot unit (520) are prevented from moving at the end of the valve (50) closing operation.

Meanwhile, Table 1 below shows the electrode operation stroke and valve operation timing.

movement Based on valve operating time after opening Stroke criteria valve opening b: 2 ~ 40ms B: 0% ~ 20% valve closure d: 17.5 ~ 72ms D: 70 ~ 100%

In the present invention, the valve (50) is opened in a region including the separation point of the first arc electrode (213) and the second arc electrode (223). That is, the insulating gas is injected after the arc is generated during the valve opening operation (a -> b), injected simultaneously with the arc generation (ab), or the valve is opened before the arc generation (b -> a).

And, for complete arc extinguishment, i.e. to respond to arc re-occurrence, the valve (50) is closed after the arc extinguishment point. (c->d)

In Table 1, the fastest valve opening time of 2 ms among the valve operating times after opening is to allow the gas to start extinguishing at the time of contact opening. This is set to 2 ms considering that the time from contact operation to opening is 5 ms and the gas arrival time from the valve (50) to the contact is 3 ms. Shortest maximum arcing time Fastest minimum arcing time

The latest valve opening time of 40 ms was selected to inject insulating gas until the longest minimum arc maintenance time (min. arcing time). The shortest maximum arc maintenance time (max. arcing time) is 60 ms (50 Hz 3 cycles), the minimum time from signal input to contact operation is 8 ms, the arc window is 9 ms, and the gas arrival time from the valve to the contact is 3 ms. Therefore, the latest valve opening time after contact operation was set to 60 - 8 - 9 - 3 = 40 ms.

Next, the time from the contact operation to the closing of the valve (50) is set to 17.5 to 72 ms as shown in the table above.

Here, the fastest valve closing time is selected to inject gas up to the fastest minimum arcing time (min. arcing time). The minimum arcing time after opening of the circuit breaker that is expected to be feasible is 5 ms, and the shortest arcing window is 7.5 ms. Therefore, the shortest feasible maximum arcing time after opening is 5 + 7.5 = 12.5 ms.

And the time from contact operation to opening is 5ms, and the valve closing time after contact operation is the maximum arcing time (max. arcing time) after contact operation, which is 12.5 + 5 = 17.5ms.

The next-latest valve closure time is the maximum arc time plus the time required for additional gas injection plus the time required for the valve shutoff signal input. The maximum arc time is 60 ms (50 Hz 3 cycles), the additional gas injection time is 20 ms, and the minimum time from signal input to contact operation is 8 ms. Therefore, the valve closure time after contact operation is 60 + 20 - 8 = 72 ms.

If the timing of valve opening and valve closing presented in this way is organized based on the stroke, valve opening is 0% to 20%, and valve closing is 70 to 100%.

In the present invention, the valve (50) does not open during the electrode insertion operation. This will be explained below.

The operation of the dual pressure gas insulated circuit breaker according to the present invention having the configuration described above will be described in detail below.

In Fig. 9, the circuit breaker of the present invention sequentially shows a state in which the first arc electrode (213) and the second arc electrode (223) are in contact, i.e., a closed state (a), a state in which the first arc electrode (213) and the second arc electrode (223) begin to separate (b), and a state in which the first arc electrode (213) and the second arc electrode (223) are separated, i.e., an open state (c).

In (a) of Fig. 9, the first arc electrode (213) and the second arc electrode (223) are in contact. That is, current is flowing. In this state, the first main electrode (210) and the second main electrode (220) are also in contact and current is flowing.

In (b) of FIG. 9, the movement of the operating lever (32) in the direction of the arrow by the operating device (30) is illustrated. The movement of the operating lever (32) causes the movement of the first arc electrode (213). In addition, the dual motion lever (230) is rotated counterclockwise with respect to the drawing, thereby causing the linkage lever (240) to move by the dual motion lever (230). The linkage lever (240) causes the movement of the second arc electrode (223). In the present invention, the second arc electrode is moved in the opposite direction to the movement direction of the operating lever (32), that is, in the direction in which it is separated from the first arc electrode (213). Accordingly, the first arc electrode (213) and the second arc electrode (223) are separated, and at this time, an arc may occur between the first arc electrode (213) and the second arc electrode (223).

Figure 9 (c) shows a state in which the first arc electrode (213) and the second arc electrode (223) are completely separated.

In this way, while the first arc electrode (213) and the second arc electrode (223) are in contact and then separated, the valve control link mechanism (250) also operates. The operation of the valve control link mechanism (250) is illustrated in Fig. 10.

The moving pipe (226) connected to the second arc electrode (223) moves along the fixed pipe (227). A linkage rod (252) constituting the valve control link mechanism (250) is connected to the moving pipe (226) and moves together. The movement of the linkage rod (252) is guided by a guide (253) and is performed along a certain trajectory. The connecting link (254) moves by the operation of the linkage rod (252), and the cam drive lever (256) rotates the camshaft (543) of the cam (540) by the movement of the connecting link (254). The rotation of the camshaft (543) causes the rotation of the cam (540).

Fig. 10 (a) shows a state corresponding to Fig. 9 (a), in which the state of the cam drive lever (256) is in contact with the first arc electrode (213) and the second arc electrode (223).

Next, Fig. 10 (b) illustrates a state corresponding to Fig. 9 (b), in which the first arc electrode (213) and the second arc electrode (223) begin to separate. In this state, the cam drive lever (256) is rotated clockwise by a certain angle compared to the state in Fig. 10 (a). Accordingly, the cam (540) can also be rotated by that angle.

Fig. 10 (c) illustrates a state corresponding to Fig. 9 (c). That is, the first arc electrode (213) and the second arc electrode (223) are completely separated. In this state, the cam drive lever (256) is further rotated clockwise. That is, the connecting link (254) is moved to the left as far as possible with respect to the drawing. In this state, the valve (50) is opened and then closed again.

In this way, the operation of the valve (50) is explained by the rotation of the cam (540) by the cam driving lever (256). Between FIGS. 11 to 17, the valve (50) is opened and closed by the operations occurring in FIGS. 9 and 10, and the insulating gas from the external gas tank (43) is transferred into the fixed pipe (227) inside the outer case (10) through the valve (50).

In the state of Fig. 11, the insulating gas on the side of the fixed pipe (227) inside the outer case (10) is at relatively low pressure. And the insulating gas in the external gas tank (43) and the connecting pipe (49) is at relatively high pressure. In the state of Fig. 11, the insulating gas delivered through the connecting pipe (49) is delivered to the valve main passage (502) through the connecting passage (509') illustrated in Fig. 7. Therefore, in the state of Fig. 11, the connecting pipe (49) and the valve main passage (502) are in a state where there is high-pressure insulating gas through the connecting passage (509'). In this state, the valve main passage (502) is not connected to the outside by the first disk (506) and the second disk (508). Therefore, there is relatively low-pressure insulating gas inside the fixed pipe (227).

And, in the state of Fig. 11, the communication passage (514) is connected to the interior of the outer case (10) through the drain hole (513') and is filled with a relatively low-pressure insulating gas. Therefore, the first disk (206) can close the communication passage (514).

In Fig. 12, the cam (540) is rotated compared to the state of Fig. 11. That is, the cam (540) is slightly rotated clockwise with respect to the cam shaft (543). The rotation of the cam (540) is performed by the cam drive lever (256).

FIG. 13 illustrates a state in which the cam (540) is rotated further clockwise by the cam driving lever (256). By the rotation of the cam (540), the first protrusion (544) of the cam (540) rotates the latch (550) counterclockwise. As the latch (550) rotates counterclockwise, the roller lever (560) is separated from the hook end (552) of the latch (550). When the roller lever (560) is separated from the hook end (552), it is rotated clockwise around the rotation center (560') by the elastic force of the elastic member (518').

Accordingly, the push rod (518) moves downward based on the drawing by the elastic force of the elastic member (518'). The movement of the push rod (518) creates the movement of the opening/closing piston (520) and the push finger (522). When the opening/closing piston (520) moves, the drain hole (513') is closed, thereby blocking the pressure inside the outer case (10). The movement of the push finger (522) causes the pilot stem (516) to move downward based on the drawing. The movement of the pilot stem (516) causes the communication passage (514) to be connected to the connection pipe (49). Therefore, the insulating gas of the external gas tank (43) flows into the communication passage (514) through the connection pipe (49). The pressure applied by the insulating gas transmitted through the above-mentioned communication channel (514) is applied to the first disk (506). According to this pressure setting, the valve stem (504), the first disk (506), and the second disk (508) move to the right with respect to the drawing.

FIG. 14 illustrates that as the valve stem (504) moves, the first disk (506) and the second disk (508) move together, thereby allowing the valve main passage (502) to communicate with the communication passage (514) and the inside of the outer case (10). However, in the state of FIG. 14, the second protrusion (546) of the cam (540) has not yet pushed the roller lever (560).

FIG. 15 illustrates a state in which the cam (540) rotates clockwise and the second protrusion (546) pushes the roller lever (560) so that the roller lever (560) rotates counterclockwise. The counterclockwise rotation of the roller lever (560) moves the push rod (518) upward with respect to the drawing. The closing piston (520) and the push finger (522) move together due to the movement of the push rod (518).

Accordingly, the drain hole (513') is opened, so that the inside of the outer case (10) and the communication passage (514) are connected, allowing relatively low-pressure insulating gas to be introduced. In addition, since the push finger (522) no longer applies force to the pilot stem (516), the pilot stem (516) moves by the elastic force of the elastic member (516') to close the communication passage (514). This state is illustrated in Fig. 16.

In the states illustrated in FIGS. 14 to 16, the relatively high-pressure insulating gas in the external gas tank (43) is delivered into the fixed pipe (227) through the valve (50), and is delivered to the nozzle (225) through the moving pipe (226) and sprayed. The insulating gas sprayed in this way is used to extinguish the arc generated between the first arc electrode (213) and the second arc electrode (223).

When low-pressure insulating gas inside the outer case (10) is introduced into the above-mentioned communication path (514) along the drain hole (513'), the pressure of the low-pressure insulating gas acts on the first disk (506), causing the valve stem (504), the first disk (506), and the second disk (508) to move in the direction of the arrow in Fig. 16 to shield the valve main path (502). In the state of Fig. 16, the second protrusion (546) does not completely support the roller lever (560).

Fig. 17 illustrates a state in which the roller lever (560) is supported by the second protrusion (546) of the cam (540). This state corresponds to (c) of Fig. 10. The positions of the valve stem (504), the first disc (506), and the second disc (508) in Fig. 17 are the same as in Fig. 11. However, the roller lever (560) is supported by the second protrusion (546) of the cam (540), not the first protrusion (544).

Next, FIGS. 18 to 20 illustrate the valve operating in the closing operation of the circuit breaker. The closing operation is to change the state from (c) of FIG. 9 to (a) of FIG. 9. That is, the first main electrode (210) and the second main electrode (220) come into contact with each other and become energized, and the first arc electrode (213) and the second arc electrode (223) also come into contact with each other and become energized.

When the second arc electrode (223) is operated by this operation, it is linked to the valve control link mechanism (250) to rotate the cam (540) counterclockwise with respect to the drawing. Accordingly, the roller lever (560) is supported by the second protrusion (546) and then becomes supported by the first protrusion (544). The roller lever (560) changes from the state of FIG. 18, where it is supported by the second protrusion (546), to the state of FIG. 20, where it is supported by the first protrusion (544).

When the cam (540) rotates from the state of Fig. 18 to the state of Fig. 19, the roller lever (560) is continuously supported by the second protrusion (546). This is because the state in which the roller lever (560) is caught on the hook end (552) of the latch (550) is not released. This is because the first protrusion (544) does not operate the latch (550) counterclockwise due to the counterclockwise rotation of the cam (540).

However, when the first protrusion (544) pushes up the latch (550) in the state of FIG. 19, the roller lever (560) is pushed up together, and the push rod (518) is pulled together.

And, as shown in FIG. 20, when the first protrusion (544) pushes up the tip of the latch (550), and then passes the tip of the latch (550) and supports the roller lever (560), the latch (550) can rotate counterclockwise and the roller lever (560) can rotate clockwise. However, since the first protrusion (544) supports the roller lever (560), the push rod (518) does not move more than a certain amount, and thus the push finger (522) cannot press the pilot stem (516).

Meanwhile, in FIGS. 21 to 23, there is a first protrusion arm (544') supported by an elastic member (545) on the cam (540'). The first protrusion arm (544') does not cause the latch (550) to rotate during the process of the insertion operation, that is, during the process of the cam (540') being rotated counterclockwise with respect to the drawing by the cam driving lever (256) of the valve control link mechanism (250). This is because the first protrusion arm (544') is supported by the elastic member (545), so that even if it comes into contact with the latch (550), the latch (550) does not operate and the first protrusion arm (544') rotates while overcoming the elastic force.

The states of FIG. 21 to FIG. 23 correspond to the operations of FIG. 18 to FIG. 20, and in FIG. 21 to FIG. 23, no movement of the push rod (518) occurs at all.

Even though all components constituting the embodiments according to the present invention have been described as being combined or operating in combination, the present invention is not necessarily limited to such embodiments. That is, within the scope of the purpose of the present invention, all components may be selectively combined and operated one or more times. In addition, terms such as "include," "comprise," or "have" described above, unless specifically stated to the contrary, mean that the corresponding component may be inherent, and therefore should be interpreted as including other components rather than excluding other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related technology, and shall not be interpreted in an ideal or overly formal sense, unless explicitly defined in the present invention.

The above description is merely an illustrative illustration of the technical idea of the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate, rather than limit, the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

10: Outer case 12: Inner space of outer case
20: Blocking part 30: Operator
32: Operating lever 40: Gas control unit
41: External housing 43: External gas tank
45: Gas compressor 47: Filter
49: Connecting pipe 50: Valve
210: First main electrode 211: First internal space
213: First arc electrode 220: Second main electrode
221: Second internal space 223: Second arc electrode
223': Electrode penetration path 225: Nozzle
226: Moving pipe 227: Fixed pipe
230: Dual motion lever 230': Rotating center axis
231: First connecting pin 232: Second connecting pin
240: Linkage lever 250: Valve control link mechanism
252: Linkage load 253: Guide
254: Connecting link 256: Cam drive lever
500: Valve body 502: Valve main euro
504: Valve stem 506: First disc
508: Second disk 509: Connection block
509': Connecting Euro 510: Pilot Department
512: Pilot body 513: Pilot interior space
513': Drain hole 514: Flue pipe
516: Pilot stem 516': Elastic member
518: Push rod 518': Elastic member
520: Opening piston 522: Push finger
530: Valve opening/closing mechanism 540: Cam
542: Cam body 543: Camshaft
544: First protrusion 544': First protrusion rock
545: Elastic member 546: Second projection
550: Retach 550': Center of rotation
552: Hanger 560: Roller lever
560': Center of rotation 562: Roller

Claims (14)

An enclosure with an internal space formed inside and filled with insulating gas,
A circuit breaker installed inside the above-mentioned enclosure and including a first arc electrode and a second arc electrode to block current flow when an abnormal current occurs;
An actuator that provides driving force for the operation of the above blocking part,
An external gas tank installed on the outside of the above enclosure and providing relatively high-pressure insulating gas to the inside of the enclosure through a valve to extinguish an arc occurring between the first arc electrode and the second arc electrode,
A dual pressure gas-insulated circuit breaker including a valve opening/closing control mechanism that opens and closes the valve using the driving force provided from the above actuator.
A dual pressure gas-insulated circuit breaker in the first paragraph, wherein the first arc electrode and the second arc electrode are operated in opposite directions by a driving force provided from the actuator.
In the second paragraph, the first arc electrode is moved linearly back and forth by the operating lever of the operating device, and the second arc electrode receives the driving force provided by the operating lever through a dual motion lever and a linkage lever to drive the valve opening/closing control mechanism. A dual pressure gas insulated circuit breaker.
In the third paragraph, the linkage lever is connected to the nozzle of the second arc electrode to move the second arc electrode in a linear reciprocating manner.
A dual pressure gas-insulated circuit breaker in accordance with claim 1, wherein the valve is installed inside the outer case and is connected to the external gas tank through a connecting pipe penetrating the outer case.
A dual pressure gas insulated circuit breaker in accordance with claim 1, wherein the actuator and the external gas tank are installed at opposite positions with respect to the outer case.
In the first paragraph, the second arc electrode has a movable pipe that moves relative to a fixed pipe through which the insulating gas discharged from the valve flows, and the insulating gas transmitted through the fixed pipe by penetrating the inside of the movable pipe is discharged to the nozzle of the second arc electrode to extinguish the arc.
A dual pressure gas-insulated circuit breaker according to any one of claims 1 to 7, wherein the valve opening/closing control mechanism comprises a linkage rod that reciprocates linearly together with the second arc electrode, a linkage link that is connected to the linkage rod and operates, and a driving lever that is rotatable relative to the linkage link and transmits a driving force for opening/closing the valve.
In the 8th paragraph, the linkage rod is a dual pressure gas insulated circuit breaker whose movement is guided by a guide installed within the outer case.
In the 8th paragraph, the linkage rod is a dual pressure gas-insulated circuit breaker that moves together with the moving pipe of the second arc electrode.
A dual pressure gas insulated circuit breaker in the first paragraph, wherein the opening operation (b) of the valve is performed between 2 ms and 40 ms after the contact operation.
A dual pressure gas-insulated circuit breaker in accordance with claim 1, wherein the opening operation (B) of the valve is performed between 0 and 20% of the contact opening stroke.
A dual pressure gas-insulated circuit breaker in accordance with claim 1, wherein the closing operation (d) of the valve is performed between 17.5 ms and 72 ms after the contact operation.
A dual pressure gas-insulated circuit breaker in accordance with claim 1, wherein the closing operation (D) of the valve is performed between 70 and 100% of the contact opening stroke.