WO2020121525A1 - Direct-current circuit breaker - Google Patents

Abstract

A direct-current circuit breaker according to an embodiment comprises a mechanical breaking part, an arrester, and a commutation device. The mechanical breaking part has at least one mechanical breaking unit. The at least one mechanical breaking unit has at least one unitized breaking part. Each of the at least one unitized breaking part has a mechanical contact section. All of the at least one unitized breaking part are connected in series to form a mechanical contact module. Both ends of the mechanical contact module are connected to a direct-current transmission system. The arrester is connected in parallel with the mechanical contact module. The commutation device has a commutation circuit. The commutation circuit is formed by connecting a reactor, a capacitor, and a closing device. The commutation circuit is connected in parallel with the mechanical contact module. The closing device is a high-speed closing device.

Description

DC circuit breaker

Embodiments of the present invention relate to a DC circuit breaker.

▽DC transmission has higher transmission efficiency than AC transmission. On the other hand, the cost of introducing equipment is higher for DC power transmission. However, in long-distance power transmission and submarine power transmission, the efficiency of DC power transmission is overwhelmingly high. Therefore, when the operating cost is added to the equipment cost, DC power transmission is generally lower in cost. Therefore, DC power transmission is used, for example, for power transmission between two bases across the sea. In recent years, in order to improve the ratio of generated power using renewable energy to the generated power and cover larger power with renewable energy, offshore wind power generation and solar power generation in desert areas have been used to A method of conducting large-scale power generation in a place far away from the urban area where electricity is consumed and transmitting power over a long distance is being studied. Along with this, it is planned to construct a DC transmission network that connects a plurality of power supply points and demand points.

When constructing a power grid that connects three or more bases, it is necessary to have a device that can quickly cut off the fault point from a healthy grid in the event of a power grid accident. Generally, a mechanical contact type circuit breaker is used in an alternating current system. The mechanical contact type circuit breaker opens a contact at a current zero point generated by an alternating current and blows an insulating medium onto the arc current between the contacts to interrupt a fault current. On the other hand, in the DC power transmission system, the current zero point does not occur in the fault current, and thus it is difficult to quickly interrupt the fault current with the conventional mechanical contact type circuit breaker.

Therefore, as a semiconductor circuit breaker capable of independently blocking a direct current, a semiconductor circuit breaker using a plurality of self-excited semiconductor elements having a self-extinguishing ability, such as an IGBT (Insulated Gate Bipolar Transistor), has been proposed. However, since all of the electric power to be transmitted always passes through the plurality of self-excited semiconductor elements, a large conduction loss occurs, resulting in a decrease in the power transmission efficiency during normal operation.

To solve this problem, a hybrid circuit breaker has been proposed in which another semiconductor circuit breaker is connected in parallel to a circuit in which a mechanical contact type circuit breaker and an auxiliary semiconductor circuit breaker are connected in series. In this hybrid circuit breaker, the mechanical contact type circuit breaker and the auxiliary semiconductor circuit breaker are in a conducting state during steady power transmission, and the other semiconductor circuit breaker is in a breaking state. Therefore, the transmission current flows through the mechanical contact type disconnector and the auxiliary semiconductor circuit breaker.

In addition, when an accident occurs, the auxiliary semiconductor circuit breaker is turned off, and at the same time an opening command is given to the mechanical contact type disconnector. When the auxiliary semiconductor breaker is in the cut-off state in this way, the fault current flowing in the path between the mechanical contact type disconnector and the auxiliary semiconductor breaker is commutated to the other semiconductor breaker. Then, after the opening operation of the mechanical contact type disconnector is completed and the withstand voltage performance of the steady energization path is secured, the other semiconductor circuit breaker is interrupted to complete the interruption of the accident current.

In such a hybrid circuit breaker, since the conduction loss during steady power transmission is only the conduction loss of the auxiliary semiconductor circuit breaker, the steady conduction path is limited to the semiconductor circuit breaker that can independently cut the DC current as described above. The conduction loss can be reduced as compared with the configuration. However, since the conduction loss of the auxiliary semiconductor circuit breaker still occurs, the conduction loss of the hybrid circuit breaker is larger than that of the conventional mechanical contact type circuit breaker in which the steady conduction path consists only of mechanical contacts. ..

Therefore, a DC circuit breaker has been proposed in which a mechanical contact type circuit breaker is connected in parallel to a circuit in which a semiconductor circuit breaker and a commutation circuit composed of a half bridge circuit are connected in series. In this DC circuit breaker, the mechanical contact type circuit breaker is in a conducting state during steady power transmission, and the semiconductor circuit breaker and the commutation circuit are in a breaking state. Therefore, the power transmission current during steady power transmission flows only through the mechanical contact type disconnector.

In addition, when an accident occurs, an opening command is given to the mechanical contact type circuit breaker, the semiconductor circuit breaker is turned on, and a commutation command is given to the commutation circuit. Then, the commutation circuit sends a current in the direction opposite to the fault current flowing through the mechanical contact type circuit breaker to generate a zero point in the current of the mechanical contact type circuit breaker, and this mechanical contact type circuit breaker opens. As a result, the fault current commutates from the mechanical contact type circuit breaker to the semiconductor circuit breaker and the commutation circuit. After commutation of the accident current, the interruption of the accident current is completed by breaking the semiconductor breaker.

In such a DC circuit breaker, the steady conduction path consists only of mechanical contact type circuit breakers, so it is possible to greatly reduce conduction loss. However, in the hybrid circuit breaker, since the semiconductor circuit breaker is expensive, the device cost may be significantly increased as compared with the conventional mechanical contact type circuit breaker.

International Publication No. 2015/166600 International Publication No. 2016/056274 International Publication No. 2017/134825

The problem to be solved by the present invention is to provide a DC circuit breaker capable of shortening the current interruption time and suppressing the equipment cost.

The DC circuit breaker of the embodiment has a mechanical circuit breaker, an arrester and a commutation device. The mechanical shutoff unit has at least one mechanical shutoff unit and an insulating column. At least one mechanical shutoff unit has at least one single shutoff. The insulating column supports at least one mechanical shutoff unit. Each of the at least one single-piece breaking section has a mechanical contact section, a closed container, an operating rod, and an operating mechanism. The mechanical contact has a fixed contact and a movable contact. The mechanical contact portion is electrically insulated from the ground. The closed container encloses the mechanical contact and the insulating gas. The closed container is electrically insulated from the ground. The operating rod is connected to the movable contact. The operation rod extends from the inside of the closed container to the outside. The operating mechanism is connected to the operating rod. The operating mechanism causes the movable contactor to move toward and away from the fixed contactor. The operating mechanism is provided at the same potential as the movable contact. At least one single body breaking unit has a first single body breaking unit and a second single body breaking unit. The first single body breaking unit and the second single body breaking unit are arranged such that the respective operating rods operate on the same straight line by the operating mechanism, and the operating directions of the operating rods by the operating mechanism are opposite to each other. The first single body breaking unit and the second single body breaking unit are arranged such that their respective operating mechanisms face each other. All at least one unitary break are connected in series to form a mechanical contact module. Both ends of the mechanical contact module are connected to the DC transmission system. The arrester is connected in parallel with the mechanical contact module. The commutation device has a commutation circuit. The commutation circuit is formed by connecting a reactor, a capacitor, and a charger in series. The commutation circuit is connected in parallel with the mechanical contact module. The injector is a high speed injector.

The perspective view which shows the DC circuit breaker of 1st Embodiment. The circuit diagram which shows the direct-current circuit breaker of 1st Embodiment. The perspective view which shows the machine interruption|blocking part of 1st Embodiment. The partial cross section figure which looked at the machine interruption unit of a 1st embodiment from the side. Sectional drawing which shows the gas disconnector of 1st Embodiment. The figure which shows the electricity supply path in the machine interruption unit of 1st Embodiment. The perspective view which shows the arrester part of 1st Embodiment. The perspective view which shows the commutation apparatus of 1st Embodiment. 1 is a perspective view showing a reactor unit and a feeder unit of the first embodiment. The perspective view which shows the capacitor unit of 1st Embodiment. The partial cross section figure which shows the throwing device of 1st Embodiment. The partial cross section figure which shows the throwing device of 2nd Embodiment. The perspective view which shows the direct-current circuit breaker of 3rd Embodiment. The perspective view which shows the DC circuit breaker of 4th Embodiment. The perspective view which shows the direct current circuit breaker of 5th Embodiment.

Hereinafter, the DC circuit breaker of the embodiment will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. In addition, redundant description of those configurations may be omitted.

(First embodiment)
FIG. 1 is a perspective view showing the DC circuit breaker of the first embodiment. FIG. 2 is a circuit diagram showing the DC circuit breaker of the first embodiment.
As shown in FIGS. 1 and 2, the DC circuit breaker 1 includes a mechanical circuit breaker 2, an arrester 3, and a commutation device 4. The DC circuit breaker 1 is installed on the foundation 5 on the ground. The upper surface of the base 5 is formed horizontally. In this embodiment, one horizontal direction is defined as a first direction, and a horizontal direction orthogonal to the first direction is defined as a second direction. Further, reference numeral X is assigned to the first direction, and reference numeral Y is assigned to the second direction. The mechanical blocking unit 2 and the arrester unit 3 are arranged side by side in the first direction X. The state of being arranged side by side in the first direction X is a state in which a plurality of objects are arranged so as to overlap each other when viewed in the first direction X. The commutation device 4 is arranged side by side in the second direction Y with respect to the mechanical blocking unit 2 and the arrester unit 3.

The mechanical shutoff unit 2 will be described.
FIG. 3 is a perspective view showing the mechanical shutoff unit of the first embodiment.
As shown in FIG. 3, the mechanical shutoff unit 2 includes a plurality (two in the present embodiment) of mechanical shutoff units 10 and a plurality (four in the present embodiment) of insulating struts 60 that support the mechanical shutoff unit 10. And a power supply unit 70 that supplies electric power to the mechanical interruption unit 10. The plurality of mechanical shutoff units 10 are stacked in a plurality of stages in the vertical direction on the insulating column 60.

The mechanical shutoff unit 10 includes a pair of single shutoff units 11 (first single shutoff unit and second single shutoff unit), a power supply unit 12, a control unit 13, a pair of single shutoff units 11, a power supply unit 12, and a control unit. And a mechanical block supporting plate 14 on which 13 is arranged.

The single breaking unit 11 includes a mechanical contact unit 21 having a fixed contact 22 and a movable contact 23 (see FIG. 4). The mechanical contact portion 21 is opened by separating the movable contact 23 from the fixed contact 22. The single cutoff unit 11 opens the mechanical contact unit 21 to cut off the energization path passing through the mechanical contact unit 21. The single circuit breaker 11 constitutes a vacuum circuit breaker 11A or a gas disconnector 11B. The vacuum circuit breaker 11A has a vacuum valve 20 in which a mechanical contact portion 21 is arranged in a vacuum insulating cylinder 24 (see FIG. 4). The gas disconnector 11B has a gas contact in which the mechanical contact 21 is arranged in insulating gas. The mechanical contact portion 21 of the vacuum circuit breaker 11A is a contact capable of mechanically interrupting the current at the current zero point. The current breaking performance of the vacuum circuit breaker 11A is higher than that of the gas disconnecting switch 11B. The withstand voltage performance of the gas disconnector 11B is higher than or equivalent to that of the vacuum circuit breaker 11A.

In each machine shutoff unit 10, it is desirable that the pair of single shutoff units 11 have the same configuration. In the present embodiment, the mechanical interruption unit 10 includes only the vacuum circuit breaker 11A or only the gas disconnector 11B. For example, the upper mechanical breaker unit 10 includes a pair of vacuum breakers 11A. The lower mechanical shutoff unit 10 includes a pair of gas disconnectors 11B.

FIG. 4 is a partial cross-sectional view of the mechanical interruption unit of the first embodiment as seen from the side. Note that FIG. 4 shows a mechanical interruption unit 10 including a vacuum circuit breaker 11A as the single interruption unit 11.
As shown in FIG. 4, the vacuum circuit breaker 11A includes a vacuum valve 20 having a mechanical contact portion 21, a closed container 30 enclosing the vacuum valve 20, and a current-carrying shaft connected to a fixed contact 22 of the mechanical contact portion 21. 34, an operating rod 35 connected to the movable contact 23 of the mechanical contact portion 21, an operating mechanism 37 connected to the operating rod 35, and a capacitor 39 (see FIG. 3) connected in parallel to the mechanical contact portion 21. , Is provided.

The vacuum valve 20 includes the mechanical contact portion 21, the insulating cylinder 24 that encloses the mechanical contact portion 21, and the bellows 25 provided inside the insulating cylinder 24.

The fixed contact 22 and the movable contact 23 of the mechanical contact portion 21 are provided so that they can come into contact with and separate from each other. The fixed contact 22 is fixedly arranged with respect to the insulating cylinder 24. The movable contact 23 is provided so as to be displaceable with respect to the insulating cylinder 24. In the following description regarding the single breaking unit 11, the direction in which the fixed contact 22 and the movable contact 23 come into contact with and separate from each other is referred to as a contact operation direction. In the present embodiment, the contact operation direction is one horizontal direction and is parallel to the first direction X.

The insulating cylinder 24 is formed in a cylindrical shape extending along the contact operation direction. The insulating tube 24 is a porcelain tube made of, for example, an insulating material. The inside of the insulating cylinder 24 is kept in a vacuum. A through hole into which the current-carrying shaft 34 is airtightly inserted is formed in the first end portion of the insulating cylinder 24. A through hole into which the operating rod 35 is inserted is formed at the second end of the insulating cylinder 24.

The bellows 25 is arranged inside the insulating cylinder 24 so as to surround the operation rod 35. One end of the bellows 25 is fixed to the outer peripheral surface of the movable contact 23. The other end of the bellows 25 is fixed to the second end of the insulating cylinder 24. The bellows 25 maintains the vacuum inside the vacuum valve 20 while allowing the movable contact 23 and the operating rod 35 to be displaced with respect to the insulating cylinder 24.

The closed container 30 is filled with, for example, sulfur hexafluoride (SF ₆ ) gas as an insulating gas. The closed container 30 includes a cylindrical insulating cylinder 31, and a first flange 32 and a second flange 33 that close the openings at both ends of the insulating cylinder 31. The insulating cylinder 31 extends along the contact operation direction. The insulating cylinder 31 is, for example, a porcelain tube formed of an insulating material. The first flange 32 and the second flange 33 are each made of a metal material.

The energizing shaft 34 is fixed to the first flange 32 of the closed container 30. The energizing shaft 34 is arranged so as to penetrate the insulating cylinder 24 of the vacuum valve 20. The energizing shaft 34 fixedly supports the vacuum valve 20 with respect to the closed container 30. The energizing shaft 34 fixedly supports the fixed contact 22 inside the insulating cylinder 24 of the vacuum valve 20. The current-carrying shaft 34 is formed of a conductive material such as metal and is electrically connected to the fixed contact 22. The current-carrying shaft 34 connects the fixed contact 22 and the first flange 32 of the closed container 30 to each other. Note that “conduction” means a state in which a plurality of objects are electrically connected to each other and have the same potential. Even if the potential difference is caused by the impedances of a plurality of objects, if the potential difference is small enough to be ignored (e.g., several tens of V or less) compared to the rated voltage of the device, it is treated as the same potential.

The operating rod 35 extends along the contact operation direction. The first end of the operating rod 35 is connected to the movable contact 23 in the insulating cylinder 24 of the vacuum valve 20. The operation rod 35 is provided slidably in the contact operation direction with respect to the second end of the insulating cylinder 24. The operation rod 35 extends from the inside of the closed container 30 to the outside of the closed container 30 through a through hole 33 a provided in the second flange 33. The operation rod 35 is provided so as to be electrically conductive and slidable with respect to the second flange 33 while maintaining the airtightness inside the closed container 30. A portion of the operation rod 35 extending from the first end portion to the sliding portion with the second flange 33 is formed of a conductive material such as metal. As a result, the operation rod 35 electrically connects the movable contact 23 and the second flange 33. At least a part of the operation rod 35 located outside the closed container 30 is provided with a rod insulating portion 35 a that electrically insulates between both ends of the operation rod 35.

The operating mechanism 37 is a highly responsive electromagnetic actuator that operates by electric power. The electromagnetic actuator is, for example, an electromagnetic repulsion type operation mechanism. The electromagnetic repulsion type operating mechanism 37 includes a metal plate of good conductor connected to the second end of the operating rod 35, and a coil installed so as to face the metal plate. At the time of driving, a current is applied to the coil to generate an induced current in the opposite direction in the metal plate, and an electromagnetic repulsive force in the opposite direction to the coil is applied to the metal plate to operate the operation rod 35.

The operation mechanism 37 is arranged outside the closed container 30 along with the second flange 33 in the contact operation direction. The operating mechanism 37 is connected to the second flange 33 by a connecting member 38. At least a part of the connecting member 38 is formed of an insulating material, and electrically insulates both ends of the connecting member 38. The operation mechanism 37 reciprocates the operation rod 35 in the contact operation direction. As a result, the operating mechanism 37 displaces the movable contact 23 fixedly provided with respect to the operating rod 35, and brings the movable contact 23 into contact with and separates from the fixed contact 22.

As shown in FIG. 3, the condenser 39 is arranged outside the closed container 30. The capacitor 39 is electrically and mechanically connected to the first flange 32 and the second flange 33 of the closed container 30. The capacitor 39 has a high-resistance cylinder in which a dielectric material is enclosed, electrodes are provided at both ends, and the capacitor 39 has capacitance and resistance. The capacitor 39 adjusts the voltage applied to the mechanical contact 21 (see FIG. 4) when the current is cut off and in the open state.

FIG. 5: is sectional drawing which shows the gas disconnector of 1st Embodiment.
As shown in FIG. 5, the gas disconnector 11B is different from the vacuum circuit breaker 11A in that the mechanical contact portion 21 is directly arranged in the closed container 30. That is, in the gas disconnector 11</b>B, the insulating gas is present between the fixed contact 22 and the movable contact 23 when the mechanical contact 21 is in the open state.

As shown in FIG. 3, in each machine breaking unit 10, the pair of single breaking units 11 are arranged so that each operating rod 35 operates on the same straight line when the mechanical contact unit 21 is opened by the operating mechanism 37. Has been done. Specifically, in each machine interruption unit 10, the operation rod 35 of each single interruption unit 11 extends on the same straight line. In the present embodiment, the operation rod 35 operates in the first direction X when the mechanical contact portion 21 is opened by the operation mechanism 37. Further, in each machine breaking unit 10, the pair of single breaking units 11 are arranged so that the operating directions of the operating rods 35 when the operating mechanism 37 opens the mechanical contact unit 21 are opposite to each other. Specifically, in each machine shutoff unit 10, the pair of single shutoff units 11 are arranged so that the respective operation mechanisms 37 are in contact with each other. Further, the single breaking unit 11 of the one mechanical breaking unit 10 and the single breaking unit 11 of the other mechanical breaking unit 10 are arranged so as to operate on the same straight line when viewed in the vertical direction.

The power supply unit 12 supplies electric power to the operating mechanism 37 of the pair of single unit breaking units 11. The power supply unit 12 is provided so that the reference potential becomes the same potential as the operation mechanism 37. The power supply unit 12 includes, for example, a capacitor that supplies power to the operating mechanism 37 when the mechanical contact unit 21 (see FIG. 4) is opened, and a capacitor that supplies power to the operating mechanism 37 when the mechanical contact unit 21 is closed. And a charging device for each capacitor, and a switching element that holds each capacitor in a charged state and discharges when power is supplied (both not shown).

The control unit 13 monitors the states of the power supply unit 12 and the operation mechanism 37 of the pair of single unit breaking units 11. In addition, the control unit 13 controls the power supply from the power supply unit 12 to the operation mechanism 37 of the pair of single unit breaking units 11.

The mechanical breaker support plate 14 supports the pair of single breakers 11, the power supply 12 and the controller 13 from below. For example, the mechanical blocking unit support plate 14 is formed of a metal material such as an aluminum alloy. The mechanical blocking section support plate 14 is formed in a rectangular shape in plan view. The mechanical blocking portion support plate 14 is arranged such that two sides of the outer edge thereof are parallel to the contact operation direction. In the present embodiment, the mechanical blocking unit support plate 14 extends in both the first direction X and the second direction Y. The mechanical blocking unit support plate 14 is stacked in a plurality of stages in the vertical direction on the insulating column 60.

In each mechanical shutoff unit 10, at least a part of the sealed container 30 of the pair of single shutoff units 11 is arranged outside the mechanical shutoff unit support plate 14 in the horizontal direction. In other words, the hermetically sealed container 30 of the pair of single unit blocking parts 11 is arranged so as to project from the mechanical blocking part support plate 14 when viewed in the vertical direction. In the illustrated example, only a part of the closed container 30 is horizontally arranged outside the mechanical block supporting plate 14, but the entire closed container 30 is horizontal and outside the mechanical block supporting plate 14. May be placed in. It suffices that a portion of the closed container 30 having the same potential as the fixed contact 22 (for example, the first flange 32) is arranged outside the machine blocking portion support plate 14 in the horizontal direction.

Here, the arrangement in the horizontal direction on the outside of the mechanical block supporting plate 14 will be described with another expression with reference to FIG. 3.
For example, if the contact operation direction described above is regarded as a projection line, two vertical projection planes that include two sides that are in a positional relationship of the projection line and the twist among the four sides that configure the mechanical blocking unit support plate 14 are defined. be able to. It suffices that at least a part of the closed container 30 is arranged so as to project from a space (a space on the side where the operation mechanism 37 exists) partitioned by the two vertical projection planes.

As shown in FIG. 4, the mechanical shutoff unit 10 further includes a support portion 15 and an in-unit bus bar 16 (conductive member).
The support portion 15 is interposed between each of the pair of single-piece blocking portions 11 and the mechanical blocking portion support plate 14. The support part 15 supports the single block part 11 in a state of being floated from the mechanical block part support plate 14. The support portion 15 includes a pair of first support portions 15</b>A interposed between the second flange 33 of the single cutoff portion 11 and the mechanical cutoff portion support plate 14, an operation mechanism 37 of the single cutoff portion 11, and a mechanical cutoff portion support plate. And a pair of second support portions 15B interposed between the second support portion 15B and the second support portion 15B. One first support portion 15A includes an insulating portion 15a that shuts off electrical continuity between the second flange 33 and the mechanical shutoff portion support plate 14. As a result, the second flange 33 of the single body breaking portion 11 supported by the one first supporting portion 15A is electrically insulated from the mechanical breaking portion supporting plate 14. The other first support portion 15</b>A electrically connects the second flange 33 of the single cutoff portion 11 and the mechanical cutoff portion support plate 14. The second support portion 15B electrically connects the operation mechanism 37 and the mechanical blocking portion support plate 14.

The bus bar 16 in the unit connects a pair of the single breaking units 11 in series. The in-unit bus bar 16 is electrically and mechanically connected to each of the second flanges 33 of the pair of single body breaking portions 11. The in-unit bus bar 16 extends above the operation mechanism 37 of the pair of single-body blocking portions 11 so as to straddle the pair of operation mechanisms 37. The in-unit bus bar 16 is made of a conductive material such as metal. As a result, the in-unit bus bar 16 electrically connects the second flanges 33 of the pair of single body breaking portions 11 and connects the mechanical contact portions 21 of the pair of single body breaking portions 11 in series.

As shown in FIG. 3, the insulating support column 60 is made of, for example, an insulator, polymer, fiber reinforced plastic, or the like. The insulating column 60 is erected on the foundation 5. The insulating support column 60 extends along the vertical direction. Each insulating column 60 supports a corner portion of each machine blocking portion support plate 14 stacked in a plurality of stages. The insulating support column 60 electrically insulates the plurality of machine interruption units 10 from each other, and also electrically insulates each machine interruption unit 10 from the ground, and fixedly supports each machine interruption unit 10. .. It should be noted that each of the insulating support columns 60 may extend continuously from the lower end to the upper end, or may be divided into a plurality of parts so as to sandwich the mechanical blocking section support plate 14. The same applies to other insulating columns described later.

The power supply unit 70 is installed on the foundation 5 on the side of the mechanical shutoff unit 10. The power supply unit 70 is arranged between the mechanical interruption unit 10 and the commutation device 4 (see FIG. 1 ). The power supply unit 70 is arranged at a position overlapping the mechanical interruption unit 10 when viewed in the second direction Y. The power supply unit 70 supplies power from the ground to the power supply unit 12 of the machine interruption unit 10. The power supply unit 70 supplies electric power while electrically insulating the ground and the power supply unit 12 from each other and electrically insulating the plurality of mechanical interruption units 10 from each other. In the present embodiment, the power feeding unit 70 includes a two-stage insulating transformer that is vertically stacked. The lower isolation transformer supplies power to the power supply unit 12 of the lower mechanical interruption unit 10. The upper isolation transformer supplies electric power to the power supply unit 12 of the upper mechanical cutoff unit 10 while electrically insulating the power supply unit 12 of the lower mechanical cutoff unit 10 and the power supply unit 12 of the upper mechanical cutoff unit 10. To do. The power supply unit 70 may be a laser power supply device, a device having a power generation function by air through an insulating tube, or the like.

The energization path of the mechanical interruption unit 10 will be described.
FIG. 6 is a diagram showing an energization path in the mechanical interruption unit according to the first embodiment.
As shown in FIG. 6, when the mechanical contact portion 21 is closed in the single cutoff portion 11, the first flange 32 and the second flange 33 are electrically connected. The second flange 33 of one of the pair of single blockers 11 is blocked from direct conduction with the mechanical block support plate 14 by the insulating portion 15a of the first support 15A. Further, in each of the single-body cutoff portions 11, the second flange 33 is cut off from direct conduction with the operation mechanism 37 by the rod insulating portion 35a of the operation rod 35 and the connecting member 38. Further, the second flanges 33 of the pair of single-body blocking portions 11 are electrically connected to each other via the intra-unit bus bar 16. Therefore, the current flowing through the pair of single cutoff portions 11 does not flow from the first flange 32 of the single cutoff portion 11 to the mechanical cutoff portion support plate 14 and the operation mechanism 37, but flows through the internal bus bar 16 and the other single cutoff portion. It reaches the first flange 32 of the blocking portion 11 (see arrow A in the figure).

The potential of each part of the mechanical interruption unit 2 will be described.
In each machine interruption unit 10, the second flange 33 of the single unit interruption section 11 is directly connected to the machine interruption section support plate 14 via the first support section 15A. In each machine interruption unit 10, the operation mechanism 37 of the pair of single interruption units 11 is electrically connected to the machine interruption unit support plate 14 via the second support 15B. The second flanges 33 of the pair of single-body blocking portions 11 are electrically connected to each other by the intra-unit bus bar 16. Therefore, the pair of operation mechanisms 37 has the same potential as the movable contactors 23 of the pair of mechanical contact portions 21 and the mechanical blocking portion support plate 14. Specifically, the reference potential of the operation mechanism 37 is the same as the movable contact 23 of the mechanical contact portion 21 and the mechanical blocking portion support plate 14. Further, in each machine interruption unit 10, since the machine interruption part support plate 14 is insulated from the ground, the mechanical contact portion 21 that is electrically connected to the machine interruption part support plate 14 is also electrically insulated from the earth. A part of the sealed container 30 is electrically connected to the mechanical contact portion 21, and thus is electrically insulated from the ground.

The electrical connection between the mechanical shutoff units 10 will be described.
As shown in FIG. 3, in a pair of machine interruption units 10 that are vertically adjacent to each other, the first flange 32 of the first unit interruption unit 11 of the first machine interruption unit 10 and the second unit of the second machine interruption unit 10 are separated. The first flanges 32 of the blocking portion 11 are connected in series with each other by the inter-unit bus bar 80. As described above, in each mechanical shutoff unit 10, the mechanical contact portions 21 of the pair of single shutoff units 11 are connected in series by the intra-unit bus bar 16, so that all single shutoff units 11 in the mechanical shutoff unit 2 are connected in series. Has been done. All the single-body breaking parts 11 connected in series form a mechanical contact module 90.

Both ends of the mechanical contact module 90 are connected to a DC transmission system that connects a supply point and a demand point. The mechanical contact module 90 includes a first connection point A1 and a second connection point A2 that are connected to the DC power transmission system. The first connection point A1 and the second connection point A2 are electrical ends of the mechanical contact module 90. The first connection point A1 is provided in the upper mechanical shutoff unit 10. The first connection point A1 constitutes an end of the mechanical contact module 90 on the supply point side (DC voltage source side) of the DC power transmission system. The second connection point A2 is provided in the lower mechanical shutoff unit 10. The second connection point A2 constitutes an end portion of the mechanical contact module 90 on the demand point side of the DC power transmission system.

The arrester unit 3 will be described.
FIG. 7 is a perspective view showing the arrester portion of the first embodiment.
As shown in FIG. 7, the arrester unit 3 includes an arrester 100, an arrester support plate 110 on which the arrester 100 is arranged, a plurality of (four in this embodiment) insulating columns 120 that support the arrester support plate 110, Equipped with.

The arrester 100 is formed by a plurality of non-linear elements 102 that conducts when a certain voltage or more is applied. The arrester 100 includes a plurality of modules 101 (two in the present embodiment) in which a plurality of nonlinear elements 102 are connected in parallel. The arrester 100 is formed by connecting the modules 101 in series.

The arrester support plate 110 supports the modules 101 one by one. Therefore, in the present embodiment, two arrester support plates 110 are provided. The arrester support plate 110 is made of a metal material such as an aluminum alloy. The arrester support plate 110 is formed in a rectangular shape in plan view. In this embodiment, the arrester support plate 110 extends in both the first direction X and the second direction Y. The arrester support plate 110 is stacked in a plurality of stages in the vertical direction on the insulating support column 120.

The insulating column 120 is made of, for example, an insulator, polymer, fiber reinforced plastic, or the like. The insulating column 120 is erected on the foundation 5. The insulating support column 120 extends along the vertical direction. Each insulating column 120 supports a corner portion of the arrester support plate 110 stacked in a plurality of stages. The insulating support column 120 electrically insulates the plurality of arrester support plates 110 from each other, and also electrically supports the arrester 100 with respect to the ground, and fixedly supports the arrester support plate 110 and the arrester 100.

The arrester 100 includes a first connection point B1 and a second connection point B2 that are connected to the DC power transmission system. The first connection point B1 and the second connection point B2 are electrical end portions of the arrester 100. The first connection point B1 is provided in the upper module 101. The first connection point B1 constitutes an end portion on the supply point side of the DC power transmission system in the arrester 100. The second connection point B2 is provided in the lower module 101. The second connection point B2 constitutes an end portion of the arrester 100 on the demand point side of the DC power transmission system.

The commutation device 4 will be described.
FIG. 8: is a perspective view which shows the commutation apparatus of 1st Embodiment.
As shown in FIGS. 2 and 8, the commutation device 4 includes a reactor unit 210 including a reactor 211, a capacitor unit 220 including a capacitor bank 221, and a charger unit 240 including a charger 241. The reactor 211, the capacitor bank 221, and the charging device 241 constitute the commutation circuit 200. The commutation circuit 200 is formed by connecting the reactor 211 and the injector 241 in series at both ends of the capacitor bank 221.

As shown in FIG. 1, the reactor unit 210 is arranged side by side with the arrester unit 3 in the second direction Y. The capacitor unit 220 is arranged side by side with the reactor unit 210 in the first direction X. The capacitor unit 220 is arranged side by side in the second direction Y with the mechanical shutoff unit 2. The injector unit 240 is arranged below the reactor unit 210. Reactor 211, capacitor bank 221, and charging device 241 are arranged at the same position in the second direction Y.

FIG. 9 is a perspective view showing the reactor unit and the charging unit of the first embodiment.
As shown in FIG. 9, the reactor unit 210 includes a reactor 211, a pair of stays 213 that support the reactor 211, and a plurality of (four in this embodiment) insulating columns 215 that support the pair of stays 213. Prepare

The both ends of the reactor 211 in the second direction Y are supported by a pair of stays 213. Each of the pair of stays 213 extends in the first direction X. The pair of stays 213 are arranged at intervals in the second direction Y. The pair of stays 213 are arranged so as to overlap each other when viewed in the second direction Y.

The insulating support 215 is made of, for example, an insulator, polymer, fiber reinforced plastic, or the like. The insulating support 215 is erected on the foundation 5. The insulating column 215 extends along the vertical direction. The insulating support columns 215 support the ends of the pair of stays 213. The insulating support columns 215 electrically insulate the pair of stays 213 from each other and electrically insulate the reactor 211 from the ground, and also fixedly support the pair of stays 213 and the reactor 211.

FIG. 10 is a perspective view showing the capacitor unit according to the first embodiment.
As shown in FIG. 9, the capacitor unit 220 includes a capacitor bank 221, a capacitor support plate 231 on which the capacitor bank 221 is arranged, and a plurality of (four in this embodiment) insulating struts 233 supporting the capacitor support plate 231. And a charging unit 235 that charges the capacitor bank 221.

The capacitor bank 221 includes a plurality (three in this embodiment) of capacitor modules 222 in which a plurality (eight in this embodiment) of capacitors 223 are connected in parallel. The capacitor bank 221 is formed by connecting the capacitor modules 222 in series. Thereby, the capacitor bank 221 can be regarded as one capacitor. The capacitor module 222 includes a plurality of capacitors 223, a first bus bar 224 that electrically connects the first terminals of the plurality of capacitors 223 to each other, and a second bus bar 225 that electrically connects the second terminals of the plurality of capacitors 223 to each other. The capacitor modules 221 are electrically connected to each other by the third bus bar 226.

The capacitor support plate 231 supports the capacitor modules 222 one by one. Therefore, in this embodiment, three capacitor support plates 231 are provided. The capacitor support plate 231 is made of an insulating material such as fiber reinforced plastic, a metal material such as an aluminum alloy, or the like. The capacitor support plate 231 is formed in a rectangular shape in plan view. In the present embodiment, the capacitor support plate 231 extends in both the first direction X and the second direction Y. The capacitor support plates 231 are vertically stacked on the insulating support columns 233 in multiple stages.

The insulating support 233 is made of, for example, an insulator, polymer, fiber reinforced plastic, or the like. The insulating support 233 is erected on the foundation 5. The insulating column 233 extends along the vertical direction. Each insulating support 233 supports the corners of the capacitor support plates 231 that are stacked in multiple stages. The insulating support 233 electrically insulates the plurality of capacitor support plates 231 from each other, electrically insulates the capacitor bank 221 from the ground, and fixedly supports the capacitor support plate 231 and the capacitor bank 221. There is.

The charging unit 235 is installed on the foundation 5 beside the capacitor bank 221 and the capacitor support plate 231. The charging unit 235 is arranged between the capacitor bank 221 and the mechanical shutoff unit 2 (see FIG. 1). The charging unit 235 is a resistor. The charging unit 235 electrically connects between the capacitor bank 221 and the charging device 241 in the commutation circuit 200 and the ground (see FIG. 8 ). That is, the first end of the charging unit 235 is electrically connected to the end of the capacitor bank 221 on the side of the charger 241. The second end of the charging unit 235 is grounded. As a result, the capacitor bank 221 can be charged with the potential difference between the system potential and the ground potential.

As shown in FIG. 9, the feeder unit 240 includes a feeder 241, a feeder support plate 243 on which the feeder 241 is arranged, and a plurality of (four in the present embodiment) supporting the feeder support plate 243. An insulating support 245 and a power feeding unit 247 that supplies electric power to the charging device 241 are provided.

The injector 241 is opened during the steady power transmission of the DC power transmission system to shut off the commutation circuit 200. The throwing device 241 is turned on when shutting off the DC power transmission system, and brings the both ends of the commutation circuit 200 into a conducting state. At least one insertion device 241 is provided. When a plurality of throwers 241 are provided, the plurality of throwers 241 are connected in series with each other. In this embodiment, a pair of insertion devices 241 are provided. The thrower 241 is a high speed thrower. The high-speed thrower is a thrower that can be closed faster than mechanical contacts driven by hydraulic pressure, spring restoring force, and electromagnetic force of an electromagnetic solenoid. In this embodiment, the injector 241 is a discharge injector (gap switch) that starts energization by lowering the insulation performance between the pair of fixed electrodes 251 and 252 to cause dielectric breakdown (see FIG. 11 ).

FIG. 11 is a partial cross-sectional view showing the injector of the first embodiment.
As shown in FIG. 11, the injector 241 includes a first electrode 251 and a second electrode 252, a container 260 that houses the first electrode 251 and the second electrode 252, and a container 260 that is close to the first electrode 251. And a trigger electrode 265 that is arranged as a pair, a pulse power source 267 that applies a pulse voltage between the first electrode 251 and the trigger electrode 265, and a connecting member 269 that connects the pulse power source 267 and the container 260.

The first electrode 251 and the second electrode 252 are formed in a columnar shape having substantially the same diameter. The first electrode 251 and the second electrode 252 are arranged coaxially with a space. The surfaces of the first electrode 251 and the second electrode 252 facing each other are formed in a hemispherical shape. The first electrode 251 is formed with a through hole 251a in which the trigger electrode 265 is arranged. The through hole 251a is formed coaxially with the central axis of the first electrode 251. The through hole 251a penetrates the first electrode 251 with a constant diameter.

The container 260 is filled with dry air, sulfur hexafluoride (SF ₆ ) gas, or the like. The container 260 has a cylindrical insulating cylinder 261 with both ends opened, a first flange 262 that closes a first end opening of the insulating cylinder 261, and a second flange 263 that closes a second end opening of the insulating cylinder 261. Equipped with. The insulating cylinder 261 surrounds the first electrode 251 and the second electrode 252. The insulating cylinder 261 is arranged coaxially with the first electrode 251 and the second electrode 252. The first flange 262 and the second flange 263 are each made of a metal material. The first electrode 251 is fixed to the first flange 262. The first flange 262 is electrically connected to the first electrode 251. A through hole 262a coaxial with the through hole 251a of the first electrode 251 is formed in the first flange 262. The second electrode 252 is fixed to the second flange 263. The second flange 263 is electrically connected to the second electrode 252.

The trigger electrode 265 is made of a conductive material such as metal or carbon and has a needle-like shape with a tapered tip. For example, as the metal conductive material, stainless steel, copper, tungsten, or the like can be used. The trigger electrode 265 is inserted into the through hole 262 a of the first flange 262 and the through hole 251 a of the first electrode 251 from the outside of the container 260 so that the tip of the trigger electrode 265 faces the second electrode 252. An insulating support cylinder 271 is airtightly inserted in the outer peripheral surface of the trigger electrode 265. The insulating support cylinder 271 is airtightly inserted into the inner peripheral surface of each of the through hole 262 a of the first flange 262 and the through hole 251 a of the first electrode 251. That is, the trigger electrode 265 is supported by the first electrode 251 and the first flange 262 via the insulating support cylinder 271. The tip of the trigger electrode 265 is arranged at the same position as the end of the first electrode 251 on the second electrode 252 side in the extending direction of the first electrode 251.

The pulse power source 267 is arranged side by side with the container 260 so as to face the first flange 262 of the container 260. The pulse power source 267 is formed in a rectangular parallelepiped shape. The pulse power source 267 includes a capacitor, a capacitor charging circuit, a resistor, a reactor, a switching device, and the like inside a housing forming an outer shell. A first cable 273 and a second cable 275 extend from the pulse power source 267. The first cable 273 is electrically connected to the base end of the trigger electrode 265. The second cable 275 is electrically connected to the first flange 262 of the container 260. The pulse power supply 267 outputs a pulse voltage between the first cable 273 and the second cable 275 when a command signal is input from the outside. As a result, a minute discharge is generated between the first electrode 251 and the trigger electrode 265, so that plasma is generated around the first electrode 251. As a result, the insulation between the first electrode 251 and the second electrode 252 is broken and an arc is generated, and an energization path that passes through the first electrode 251 and the second electrode 252 is formed.

The connecting member 269 is arranged between the container 260 and the pulse power source 267. The connecting member 269 is made of a metal material. The connecting member 269 is formed in a cylindrical shape having substantially the same diameter as the container 260. The connecting member 269 is arranged coaxially with the container 260 and surrounds the first cable 273 and the second cable 275. The first end opening of the connecting member 269 is electrically and mechanically connected to the first flange 262 of the container 260. The second end opening of the connecting member 269 is electrically and mechanically connected to the housing of the pulse power supply 267. As a result, the casing of the pulse power source 267 has the same potential as the first electrode 251. Specifically, the reference potential of the pulse power supply 267 is the same as that of the first electrode 251.

As shown in FIG. 9, the pair of injectors 241 are arranged side by side in the horizontal direction. The first charging device 241 is arranged so that the container 260 is located on the side of the capacitor unit 220 in the first direction X with respect to the pulse power source 267. The second thrower 241 is arranged side by side on the arrester section 3 side with respect to the pulse power source 267 of the first thrower 241. The second charging device 241 is arranged such that the container 260 is located on the arrester unit 3 side in the second direction Y with respect to the pulse power supply 267.

The thrower support plate 243 collectively supports a pair of throwers 241. The thrower support plate 243 is formed of a metal material such as an aluminum alloy. The thrower support plate 243 is formed in a rectangular shape in plan view. In the present embodiment, the feeder support plate 243 extends in both the first direction X and the second direction Y. The thrower support plate 243 is vertically stacked on the insulating support column 245 in a plurality of stages. The thrower support plate 243 has the same potential as the casing of the pulse power source 267 of each of the pair of throwers 241. Specifically, the feeder support plate 243 has the same potential as the reference potential of the pulse power source 267 of each of the pair of feeders 241.

As described above, the first electrode 251 of the injector 241 is electrically connected to the housing of the pulse power source 267 via the connecting member 269. Further, the casing of the pulse power source 267 is electrically connected to the thrower support plate 243. As a result, the casings of the pair of pulse power sources 267 are electrically connected to each other, so that the first electrodes 251 of the pair of injectors 241 are also electrically connected to each other. Note that the casings of the pair of pulse power sources 267 may be electrically connected to each other by being adjacent to each other. Therefore, by charging the pair of charging devices 241 to the charging device unit 240, an energization path from the second flange 263 of the one charging device 241 to the second flange 263 of the other charging device 241 is formed. By connecting the first flanges 262 of the pair of charging devices 241 with bus bars (not shown), and connecting the first flange 262 of one charging device 241 and the connecting member 269 via an insulating material (not shown), The energization path from the second flange 263 of the charging device 241 to the second flange 263 of the other charging device 241 may be limited to a bus bar (not shown).

The insulating support 245 is made of, for example, an insulator, polymer, fiber reinforced plastic, or the like. The insulating column 245 is erected on the foundation 5. The insulating support 245 extends along the vertical direction. Each insulating support 245 supports a corner of the feeder support plate 243. In this embodiment, the insulating support 245 is also used as the insulating support 215 of the reactor unit 210. The insulating column 245 electrically insulates the charging device 241 from the ground, and fixedly supports the charging device support plate 243 and the charging device 241.

The power feeding unit 247 is installed on the foundation 5 beside the thrower 241 and the thrower support plate 243. The power feeding section 247 is arranged between the feeder support plate 243 and the capacitor unit 220 (see FIG. 8). The power feeding unit 247 supplies power to the pulse power source 267 from the ground. The power feeding unit 247 supplies electric power while electrically insulating the ground and the pulse power source 267. The power feeding unit 247 is, for example, an insulating transformer.

The container 260 of the pair of feeders 241 is horizontally arranged outside the feeder support plate 243. In other words, the containers 260 of the pair of feeders 241 are arranged so as to project from the feeder support plate 243 when viewed in the vertical direction. In the illustrated example, the entire container 260 is horizontally arranged outside the feeder support plate 243, but only a part of the container 260 is horizontally arranged outside the feeder support plate 243. May be. It suffices that a portion of the container 260 having the same potential as the second electrode 252 (for example, the second flange 263) is arranged outside the feeder support plate 243 in the horizontal direction.

As shown in FIG. 8, one electrical end of the reactor 211 is electrically connected by a bus bar 201 to an end of the capacitor bank 221 on the supply point side of the DC transmission system. The second flange 263 of the first thrower 241 is electrically connected to the end of the capacitor bank 221 on the demand point side of the DC power transmission system by the bus bar 202. Accordingly, the commutation circuit 200 has a configuration in which the reactor 211 and the charging device 241 are connected in series at both ends of the capacitor bank 221.

The arrangement of the reactor 211, the capacitor bank 221, and the charger 241 in the commutation circuit 200 is not limited to the above example. The charging unit of the capacitor unit may be connected between the charging device and the capacitor bank.

The commutation device 4 includes a first connection point C1 and a second connection point C2 that are connected to the DC transmission system. The first connection point C1 and the second connection point C2 are electrical ends of the commutation circuit 200. The first connection point C1 is provided on the reactor 211. The first connection point C1 constitutes an end portion of the commutation circuit 200 on the supply point side of the DC power transmission system. The second connection point C2 is provided on the second flange 263 of the second thrower 241. The second connection point C2 constitutes an end of the commutation circuit 200 on the demand point side of the DC power transmission system.

With reference to FIG. 1, the electrical connection of the mechanical interruption part 2, the arrester part 3 and the commutation device 4 will be described.
The first connection point A1 of the mechanical interruption section 2 and the first connection point B1 of the arrester section 3 are electrically connected by a bus bar 301. The second connection point A2 of the mechanical interruption unit 2 and the second connection point B2 of the arrester unit 3 are electrically connected by a bus bar 302. Thereby, the arrester 100 of the arrester unit 3 is connected in parallel to the mechanical contact module 90 of the mechanical interruption unit 2.

The first connection point B1 of the arrester unit 3 is electrically connected to the power transmission line on the supply point side of the DC power transmission system by the bus bar 303. The second connection point B2 of the arrester unit 3 is electrically connected to the power transmission line on the demand point side of the DC power transmission system by the bus bar 304. As a result, the mechanical contact module 90 of the mechanical interruption unit 2 constitutes a constant power supply path of the DC power transmission system.

The first connection point C1 of the commutation device 4 and the first connection point B1 of the arrester unit 3 are electrically connected by a bus bar 305. The second connection point C2 of the commutation device 4 and the second connection point B2 of the arrester unit 3 are electrically connected by a bus bar 306. As a result, the commutation circuit 200 of the commutation device 4 is connected in parallel to the arrester 100 of the arrester unit 3 and the mechanical contact module 90 of the mechanical interruption unit 2. Further, the injector 241 of the commutation device 4 is arranged in the commutation circuit 200 at the most demand point side of the DC transmission system.

The operation of the DC breaker 1 will be described.
During steady power transmission of the DC power transmission system, the power transmission current flows through the mechanical contact module 90. In this state, no current flows in the arrester 100 and the commutation circuit 200. Further, the capacitor bank 221 of the commutation circuit 200 is charged by the charging unit 235.

For example, when a fault current occurs in the DC power transmission system, the control device (not shown) detects the fault current, gives a fault shutoff command to the DC circuit breaker 1, and brings the commutation circuit 200 into a conducting state. Specifically, a control device (not shown) gives a closing command to the pulse power source 267 of the charging unit 240 to switch on the pair of charging devices 241. Further, the mechanical contact portions 21 of all the single breaking portions 11 of the mechanical contact module 90 are opened. Specifically, a controller (not shown) gives an opening operation command to the controller 13 of the machine breaking unit 10 to open the mechanical contact 21 of each single breaking unit 11. At this time, in each machine interruption unit 10, the pair of operation rods 35 operate in the opposite directions on the same straight line, so that the impact force and reaction force generated in the operation mechanism 37 are offset.

When the commutation circuit 200 becomes conductive, the charged capacitor bank 221 is discharged. When the charge of the capacitor bank 221 is discharged, the current of the mechanical contact module 90 connected in parallel to the commutation circuit 200 decreases due to the LC resonance of the capacitor bank 221 and the reactor 211, and a current zero point is generated in the mechanical contact module 90. To be done. As a result, the arc is extinguished at the mechanical contact portion 21 of each single-piece breaking portion 11, and the energization path passing through the mechanical contact module 90 is cut off. The timing of turning on the throwing device 241 may be the same as the timing of opening the mechanical contact portion 21 of the single breaking unit 11, or may be after the timing of opening the mechanical contact portion 21 of the single breaking unit 11. .. In general, since the closing device 241 has a quicker response than the mechanical contact portion 21, by closing the closing device 241 at the above timing, the zero current point before the mechanical contact portion 21 is completely opened. Can be prevented from being generated.

When the energization path passing through the mechanical contact module 90 is cut off, the fault current commutates to the arrester 100 connected in parallel to the mechanical contact module 90. After that, the energy of the fault current is absorbed in the arrester 100, and the interruption of the fault current of the DC transmission system is completed.

As described above, the DC circuit breaker 1 according to the present embodiment includes the mechanical contact module 90 formed by connecting all the single circuit breakers 11 in series, and the commutation circuit 200 connected in parallel to the mechanical contact module 90. And with. The commutation circuit 200 is formed by connecting a reactor 211, a capacitor bank 221, and a charging device 241 in series.
According to this configuration, the mechanical contact module connected in parallel to the commutation circuit 200 is activated by closing the charger 241 to discharge the electric charge of the capacitor bank 221 and LC resonance of the capacitor bank 221 and the reactor 211 in the commutation circuit 200. A zero current point can be generated at 90. Therefore, the semiconductor circuit breaker connected in parallel with the mechanical contact module as in the prior art is not required, and the device cost can be suppressed.
Further, in this embodiment, the feeder 241 of the commutation device 4 is a high-speed feeder. According to this configuration, the commutation circuit 200 can be brought into the conducting state at a higher speed than the mechanical contact driven by the hydraulic pressure, the restoring force of the spring, and the electromagnetic force of the electromagnetic solenoid. Therefore, the current flowing through the mechanical contact module 90 can be interrupted at the same speed as the configuration using the semiconductor circuit breaker as in the related art.
As described above, it is possible to provide the DC circuit breaker 1 capable of shortening the current interruption time and suppressing the device cost.

In addition, the injector 241 of the present embodiment is a discharge injector that lowers the insulating performance between the pair of fixed electrodes 251 and 252 to cause dielectric breakdown to start energization.
According to this structure, the mechanical drive unit is not provided in the injector. Therefore, it is possible to configure a high-speed injector that can be closed at a higher speed than the mechanical contact driven by the hydraulic pressure, the restoring force of the spring, and the electromagnetic force of the electromagnetic solenoid.

In addition, the injector 241 has a container 260 that houses the first electrode 251 and the second electrode 252, and a pulse power supply 267 that is provided at the same potential as the first electrode 251. The injector support plate 243 is made of a metal material and is provided at the same potential as the pulse power source 267. The container 260 of the charging device 241 is arranged outside the charging device support plate 243 in the horizontal direction.
According to this configuration, it is possible to move the pulse power source 267 closer to the feeder support plate 243 and move the portion of the container 260 having the same potential as the second electrode 252 (second flange 263) away from the feeder support plate 243. Therefore, as compared with the case where the entire container 260 is horizontally arranged at a position overlapping the feeder support plate 243, the portion of the container 260 having the same potential as the second electrode 252 is insulated from the feeder support plate 243. At the same time, the feeder 241 and the feeder support plate 243 can be brought closer to each other in the vertical direction. Therefore, it is possible to prevent the space in which the feeder 241 and the feeder support plate 243 are arranged from increasing in size in the vertical direction.

Further, the commutation device 4 includes a resistor (charging unit 235) that electrically connects between the capacitor bank 221 and the charging device 241 and the ground.
According to this configuration, since the potential difference between the system potential of the DC power transmission system and the ground potential is applied to the capacitor bank 221, the capacitor bank 221 can be charged. Therefore, the configuration of the DC circuit breaker 1 can be simplified as compared with the case where a DC power source or the like for charging the capacitor bank is separately provided. Therefore, the equipment cost of the DC circuit breaker 1 can be further suppressed.

Further, the mechanical shutoff unit 2 and the arrester unit 3 (arrestor 100) are arranged side by side in the first direction X. The commutation device 4 is arranged side by side in the second direction Y with respect to the mechanical blocking unit 2 and the arrester unit 3.
According to this configuration, the mechanical shutoff unit 2, the arrester unit 3, and the commutation device 4 are collectively arranged as compared with the case where the mechanical shutoff unit, the arrester unit, and the commutation device are arranged in a straight line. You can Therefore, the installation area of the DC circuit breaker 1 can be reduced.

Further, the reactor unit 210, the condenser unit 220, and the thrower unit 240 are arranged at the same position in the second direction Y.
According to this configuration, the space occupied by the commutation device 4 in the second direction Y is greater than that in the case where any one of the reactor unit, the capacitor unit, and the injector unit is arranged in the second direction Y when viewed from the first direction X. Can be made smaller. Therefore, the mechanical shutoff unit 2, the arrester unit 3, and the commutation device 4 can be arranged more intensively.

The mechanical shutoff unit 2 also includes a power feeding unit 70 that supplies power to the operation mechanism 37 of the single shutoff unit 11. The power feeding unit 70 includes an insulating transformer. The insulating transformer is arranged between the mechanical shutoff unit 10 and the commutation device 4.
With this configuration, it is possible to effectively utilize the space between the mechanical interruption unit 10 and the commutation device 4 and suppress an increase in the installation area of the DC circuit breaker 1.

In addition, the single cutoff unit 11 has a fixed contact 22 and a movable contact 23 and is electrically insulated from the ground, and a mechanical contact 21 and an insulating gas are sealed to electrically connect the ground. It has an insulated closed container 30, an operation rod 35 connected to the movable contact 23, and an operation mechanism 37 connected to the operation rod 35 and provided at the same potential as the movable contact 23.
According to this configuration, since the closed container 30 is not grounded to the ground, the insulation between the closed container 30 and the mechanical contact portion 21 can be omitted. Therefore, as compared with the case where the closed container is electrically insulated from the mechanical contact portion by being grounded to the ground, the closed container 30 can be downsized and the single cutoff portion 11 can be prevented from increasing in size. Further, even when a plurality of single-piece breaking units 11 are connected in series to improve the breaking performance as the voltage becomes higher, it is possible to suppress the size increase of all the single-piece breaking units 11 connected in series. Therefore, it is possible to provide the DC circuit breaker 1 that can easily increase the voltage and can suppress the increase in size.
Further, according to the above configuration, since the closed container 30 and the operating mechanism 37 are not grounded to the ground, it is not necessary to insulate the mechanical contact portion 21 from the operating mechanism 37. Therefore, the mechanical contact portion 21 and the operating mechanism 37 can be arranged closer to each other as compared with the case where the operating mechanism is electrically insulated from the mechanical contact portion by being grounded to the ground. As a result, it is possible to suppress the lengthening of the operating rod 35, suppress an increase in the mass of the movable portion of the operating mechanism 37, and suppress a decrease in the contact opening speed of the mechanical contact portion 21. Therefore, it is possible to provide the DC circuit breaker 1 capable of ensuring the responsiveness of the breaking operation.

In addition, in the pair of single unit breaking units 11 in each machine breaking unit 10, the respective operating rods 35 are operated on the same straight line by the operating mechanism 37, and the operating directions of the operating rods 35 by the operating mechanism 37 are opposite directions. It is located in.
With this configuration, it is possible to cancel the impact force and the recoil generated in the operating mechanism 37 when the operating rod 35 is operated on the mechanical interrupting portion support plate 14 of each mechanical interrupting unit 10. As a result, it is possible to suppress the occurrence of a bending moment in the insulating support column 60 that supports the mechanical shutoff unit 10 during operation of the operation mechanism 37. Therefore, it is possible to suppress the vibration of the mechanical blocking unit 2, and it is possible to suppress an excessive increase in the size of the insulating support column 60, an increase in the support structure, and an increase in the weight associated therewith.

Further, the pair of single-piece breaking units 11 arranged on the mechanical breaking unit support plate 14 are arranged so that the respective operating mechanisms 37 contact each other.
According to this configuration, compared with the configuration in which the respective closed containers 30 are in contact with each other, the impact force and the recoil in the situation where the impact force and the recoil that occur in the operation mechanism 37 when the operation rod 35 is operated are offset, It is possible to directly offset between the operating mechanisms 37 made of a metal material having a relatively high strength without canceling through the closed container 30 made of a porcelain tube having a relatively low strength. Therefore, it is possible to prevent a large force from being applied to the closed container 30. Thereby, the breakage of the single breaking unit 11 can be suppressed, and the reliability of the mechanical breaking unit 10 can be improved.

In addition, since the plurality of machine interruption units 10 are stacked in a plurality of stages on the insulating support column 60, the installation area of the DC circuit breaker 1 is larger than that in the case where the machine interruption units are arranged side by side in the horizontal direction. Can be reduced.

The mechanical shutoff unit 10 also includes a mechanical shutoff unit support plate 14 supported by an insulating column 60 on which a pair of single shutoff units 11 are arranged. The mechanical blocking section support plate 14 is made of a metal material and is provided at the same potential as the operating mechanism 37 of the pair of single blocking sections 11. At least a part of the closed container 30 of each of the pair of single block units 11 is arranged outside the mechanical block support plate 14 in the horizontal direction.
According to this configuration, it is possible to move the operation mechanism 37 closer to the mechanical interruption portion support plate 14 and move the portion (first flange 32) of the closed container 30 having the same potential as the fixed contact 22 away from the mechanical interruption portion support plate 14. it can. Therefore, as compared with the case where the entire hermetically sealed container 30 is horizontally arranged at a position overlapping the mechanical blocking portion support plate 14, a portion of the hermetically sealed container 30 having the same potential as that of the fixed contact 22 and a mechanical blocking portion support plate. It is possible to bring the single cutoff portion 11 and the mechanical cutoff portion support plate 14 closer to each other in the vertical direction while insulating them from each other. Therefore, it is possible to suppress an increase in the size of the mechanical blocking unit 2 in the vertical direction, and to suppress a bending moment generated in the insulating support column 60 that supports the mechanical blocking unit 10.

Further, the operation rod 35 of the single body breaking portion 11 has a rod insulating portion 35 a that blocks the conduction between the movable contact 23 and the operating mechanism 37. The mechanical shutoff unit 10 has an in-unit bus bar 16 and an insulating portion 15a. The in-unit bus bar 16 electrically connects the second flanges 33 of the pair of single-piece breaking units 11 to each other. The insulating portion 15 a is provided on the support portion 15 that is interposed between the second flange 33 of the single unit breaking portion 11 and the mechanical blocking portion support plate 14. The insulating portion 15a cuts off electrical continuity between the second flange 33 of the one unit breaking unit 11 and the mechanical blocking unit support plate 14. The second flange 33 of the other single cutoff portion 11 and the mechanical cutoff portion support plate 14 are electrically connected to each other through the first support portion 15A.
According to this configuration, in the single cutoff section 11, the power supply path from the second flange 33 through the operation rod 35 to the operation mechanism 37 is cut off by the rod insulating section 35a. In addition, in the mechanical interruption unit 10, the energization path from the second flange 33 on one side to the second flange 33 on the other side through the mechanical interruption part support plate 14 is interrupted by the insulating part 15 a of the support part 15. Therefore, in the mechanical shutoff unit 10, an energization path that passes through the pair of single shutoff parts 11 is formed in the unit busbar 16. As a result, it is possible to avoid the occurrence of partial discharge or dielectric breakdown at an unintended portion such as in the vicinity of the mechanical blocking portion support plate 14 or the operating mechanism 37. Therefore, the reliability of the mechanical interruption unit 10 can be improved.
Since the second flange 33 of the other single breaking unit 11 and the mechanical breaking supporting plate 14 are electrically connected to each other through the first supporting unit 15A, the movable contact 23 and the operating mechanism 37 may be provided at the same potential. it can.

(Second embodiment)
FIG. 12 is a partial cross-sectional view showing the injector of the second embodiment.
The second embodiment shown in FIG. 12 is different from the first embodiment in that a charging device 341 is provided instead of the charging device 241 of the first embodiment. The configuration other than that described below is the same as that of the first embodiment.

As shown in FIG. 12, the inserter 341 is a high-speed inserter. The high-speed thrower is a thrower that can be closed faster than mechanical contacts driven by hydraulic pressure, spring restoring force, and electromagnetic force of an electromagnetic solenoid. In this embodiment, the injector 341 is a discharge injector that starts energization by lowering the insulation performance between the pair of fixed electrodes 351 and 352 to cause dielectric breakdown.

The injector 341 is replaced with the 1st electrode 251, the 2nd electrode 252, the container 260, and the trigger electrode 265 in the injector 241 of 1st Embodiment, and replaces the 1st electrode 351, the 2nd electrode 352, the container 360, and the trigger. An electrode 365 is provided.

The first electrode 351 and the second electrode 352 are formed in the same manner as the first electrode 251 and the second electrode 252 of the first embodiment except that the through hole is not formed in the first electrode 351.

The container 360 houses the first electrode 351 and the second electrode 352. The container 360 is filled with dry air, sulfur hexafluoride (SF ₆ ) gas, or the like. The container 360 includes a cylindrical insulating cylinder 361 having both ends opened, a first flange 362 closing the first end opening of the insulating cylinder 361, and a second flange 363 closing the second end opening of the insulating cylinder 361. Equipped with. The insulating cylinder 361 surrounds the first electrode 351 and the second electrode 352. The insulating cylinder 361 is arranged coaxially with the first electrode 351 and the second electrode 352. The insulating cylinder 361 is divided at an intermediate portion in the extending direction of the insulating cylinder 361, and holds an annular trigger electrode 365 described later in an airtight manner. The first flange 362 and the second flange 363 are formed in the same manner as the first flange 262 and the second flange 263 of the first embodiment except that the through hole is not formed in the first flange 362.

The trigger electrode 365 is arranged so as to surround the gap between the first electrode 351 and the second electrode 352. The trigger electrode 365 is formed of a conductive material such as metal or carbon. For example, as the metal conductive material, stainless steel, copper, tungsten, or the like can be used. The trigger electrode 365 is formed in an annular shape and is arranged coaxially with the first electrode 351 and the second electrode 352. The trigger electrode 365 is fixedly supported by the insulating cylinder 361 of the container 360. The inner peripheral portion of the trigger electrode 365 is formed so as to gradually become thinner from the outer side toward the inner side in the radial direction. The trigger electrode 365 is electrically insulated from the first electrode 351 and the second electrode 352. A first cable 273 extending from the pulse power source 267 is electrically connected to the outer periphery of the trigger electrode 365.

The pulse power supply 267 outputs a pulse voltage between the first cable 273 and the second cable 275 when a command signal is input from the outside. As a result, the electric field is concentrated between the first electrode 351 and the trigger electrode 365, and the electric field between the first electrode 351 and the second electrode 352 is distorted. As a result, the insulation between the first electrode 351 and the second electrode 352 is broken and an arc is generated, and an energization path that passes through the first electrode 351 and the second electrode 352 is formed.

As described above, the injector 341 of the present embodiment is a discharge injector that starts energization by lowering the insulation performance between the pair of fixed electrodes 351 and 352 to cause dielectric breakdown. According to this configuration, the same operational effect as that of the first embodiment can be obtained.

(Third Embodiment)
FIG. 13 is a perspective view showing a DC circuit breaker of the third embodiment.
The third embodiment shown in FIG. 13 is different from the first embodiment in that a charging unit 335 is provided instead of the charging unit 235 in the capacitor unit 220 of the first embodiment. The configuration other than that described below is the same as that of the first embodiment.

As shown in FIG. 13, the charging unit 335 is installed on the foundation 5 on the side of the capacitor bank 221 and the capacitor support plate 231. The charging unit 335 includes a DC power supply 336 and an insulating transformer 337 that supplies electric power to the DC power supply 336.

The DC power supply 336 is electrically connected to both ends of the capacitor bank 221. The DC power supply 336 charges the capacitor bank 221 by applying a voltage across the capacitor bank 221. The DC power supply 336 is supported by a plurality of (four in this embodiment) insulating columns 338. The insulating support 338 fixedly supports the DC power supply 336 while electrically insulating the DC power supply 336 from the ground. The insulating transformer 337 is installed on the foundation 5 below the DC power supply 336. The insulating transformer 337 is arranged in a region surrounded by a plurality of insulating columns 338 when viewed in the vertical direction. The isolation transformer 337 supplies electric power from the ground to the DC power supply 336. The isolation transformer 337 supplies electric power while electrically insulating the ground from the DC power supply 336.

As described above, the charging unit 335 of this embodiment includes the DC power supply 336 that applies a voltage across the capacitor bank 221. With this configuration, the capacitor bank 221 can be charged. Therefore, the same effect as that of the first embodiment can be obtained.

(Fourth Embodiment)
FIG. 14: is a perspective view which shows the DC circuit breaker of 4th Embodiment.
The fourth embodiment shown in FIG. 14 is different from the first embodiment in that a feeder unit 440 is provided instead of the feeder unit 240 of the first embodiment. The configuration other than that described below is the same as that of the first embodiment.

As shown in FIG. 14, the thrower unit 440 has a configuration in which a thrower 441, a power supply unit 462, and a control unit 463 are arranged on the thrower support plate 243 instead of the thrower 241 of the first embodiment. ..

At least one inserter 441 is provided. When a plurality of throwers 441 are provided, the plurality of throwers 441 are connected in series. In this embodiment, a pair of insertion devices 441 are provided. The thrower 441 is a high speed thrower. The high-speed thrower is a thrower that can be closed at a higher speed than mechanical contacts driven by hydraulic pressure, spring restoring force, and electromagnetic force of an electromagnetic solenoid. In this embodiment, the injector 441 is a mechanical injector that drives a pair of contacts separated from each other by an electromagnetic repulsive force to bring them into contact with each other to energize them.

The throwing device 441 has a configuration similar to that of the single body breaking unit 11 shown in FIG. The throwing device 441 is formed in the same manner as the single breaking unit 11 except that the moving contact 23 (see FIG. 4) is moved in a different direction by the throwing device operating mechanism 437. The mechanical contact portion 21 (see FIG. 4) of the injector 441 is opened during the steady power transmission of the DC power transmission system to shut off the commutation circuit 200. The mechanical contact portion 21 is closed when the DC power transmission system is shut off, so that both ends of the commutation circuit 200 are brought into conduction. The operation mechanism 437 for injectors is an electromagnetic repulsion type operation mechanism. The injector operating mechanism 437 includes a metal plate of good conductor connected to the operation rod 35 (see FIG. 4), and a coil installed so as to face the metal plate. When the mechanical contact portion 21 is closed (that is, when the throwing device 441 is turned on), a current is applied to the coil to generate an induced current in the opposite direction to the metal plate, and the electromagnetic force in the opposite direction to the coil is applied to the metal plate. A repulsive force is applied to operate the operation rod 35. The mechanical contact 21 may be the contact of the vacuum valve 20 described above or a gas contact.

The pair of injectors 441 are arranged so that each operation rod 35 operates on the same straight line when the mechanical contact portion 21 of the injector operation mechanism 437 is closed. Specifically, the operating rod 35 of each thrower 441 extends on the same straight line. In the present embodiment, the operating rod 35 operates in the second direction Y when the mechanical contact portion 21 is closed by the injector operating mechanism 437. Further, the injector 441 is arranged so that the operating directions of the operating rods 35 are opposite to each other when the mechanical contact portion 21 is closed by the injector operating mechanism 437. Specifically, the pair of injectors 441 are arranged such that the respective operation mechanisms 437 for the injectors are in contact with each other.

The power supply unit 462 supplies electric power to the operation mechanism 437 for the insertion device of the pair of insertion devices 441. The power supply unit 462 is provided so that the reference potential becomes the same potential as the operation mechanism 437 for the injector. The power supply unit 462 includes, for example, a capacitor that supplies power to the operating mechanism 437 for the injector when the mechanical contact 21 of the injector 441 is opened, and an operating mechanism for the injector when the mechanical contact 21 of the injector 441 is closed. A capacitor for supplying electric power to 437, a charging device for each capacitor, and a switching element that holds each capacitor in a charged state and discharges when power is supplied (all are not shown). The power supply unit 462 is supplied with power from the power supply unit 247.

The control unit 463 monitors the states of the power supply unit 462 and the operation mechanism 437 for the insertion device of the pair of insertion devices 441. Further, the control unit 463 controls the power supply from the power supply unit 462 to the operating mechanism 437 for the injector of the pair of injectors 441.

At least a part of the closed container 30 of the pair of feeders 441 is arranged outside the feeder support plate 243 in the horizontal direction. In other words, the closed container 30 of the pair of feeders 441 is arranged so as to project from the feeder support plate 243 when viewed in the vertical direction. In the illustrated example, only a part of the closed container 30 is horizontally arranged outside the feeder support plate 243, but the entire closed container 30 is horizontally arranged outside the feeder support plate 243. It may have been done. It suffices that a portion of the closed container 30 having the same potential as the fixed contact 22 (for example, the first flange 32) is arranged outside the feeder support plate 243 in the horizontal direction.

A support portion 465 is interposed between the pair of feeders 441 and the feeder support plate 243. The support portion 465 is configured similarly to the support portion 15 in the mechanical shutoff unit 10. The pair of injectors 441 are connected in series by a bus bar 466. The bus bar 466 is configured similarly to the in-unit bus bar 16 in the mechanical shutoff unit 10. As a result, the energization path in the injector unit 440 and the potential of each part of the injector unit 440 are the same as those in the mechanical shutoff unit 2.

As described above, the injector 441 of the present embodiment is a mechanical injector that drives a pair of contacts that are separated from each other by an electromagnetic repulsive force to bring them into contact with each other to energize them. According to this configuration, it is possible to configure a high-speed injector which can be closed at a higher speed than the mechanical contact driven by the hydraulic pressure, the restoring force of the spring, and the electromagnetic force of the electromagnetic solenoid. Therefore, the same effect as that of the first embodiment can be obtained.

Further, the feeder support plate 243 is formed of a metal material and is provided at the same potential as the feeder operating mechanism 437 of the pair of feeders 441. At least a part of the closed container 30 of each of the pair of feeders 441 is arranged outside the feeder support plate 243 in the horizontal direction.
According to this configuration, it is possible to bring the portion (first flange 32) having the same potential as the fixed contact 22 in the closed container 30 away from the feeder support plate 243 while bringing the feeder operation mechanism 437 close to the feeder support plate 243. it can. Therefore, as compared with the case where the entire hermetically sealed container 30 is horizontally disposed at a position overlapping the feeder support plate 243, a portion of the hermetically sealed container 30 having the same potential as the fixed contact 22 and the feeder support plate 243 are provided. It is possible to bring the injector 441 and the injector support plate 243 closer to each other in the vertical direction while insulating the same. Therefore, it is possible to prevent the space in which the feeder 441 and the feeder support plate 243 are arranged from increasing in size in the vertical direction.

(Fifth Embodiment)
FIG. 15 is a perspective view showing a DC circuit breaker of the fifth embodiment.
The fifth embodiment shown in FIG. 15 differs from the first embodiment in that the mechanical shutoff unit 2, the arrester unit 3, and the commutation device 4 are arranged in a straight line. The configuration other than that described below is the same as that of the first embodiment.

As shown in FIG. 15, in the present embodiment, the mechanical shutoff unit 2, the arrester unit 3, and the commutation device 4 are arranged side by side in the first direction X. In the machine breaking unit 2, the sealed containers 30 of the pair of unit breaking units 11 of each machine breaking unit 10 are arranged so as to project from the machine breaking unit support plate 14 in the first direction X. In the mechanical interruption unit 2, the power feeding unit 70 is arranged in one of the second directions Y with respect to the mechanical interruption unit 10. The arrester unit 3 is adjacent to the mechanical shutoff unit 2. That is, the arrester unit 3 is arranged between the mechanical interruption unit 2 and the commutation device 4.

The commutation device 4 is arranged such that the reactor unit 210, the injector unit 240, and the condenser unit 220 are arranged in the first direction X. The reactor unit 210 and the injector unit 240 are arranged between the arrester unit 3 and the capacitor unit 220. In the reactor unit 210, the reactor 211 is supported at both ends in the first direction X by a pair of stays 213. In the capacitor unit 220, the charging section 235 is arranged on the one side in the second direction Y with respect to the capacitor supporting plate 231. In the feeder unit 240, the containers 260 of the pair of feeders 241 are arranged so as to project from the feeder support plate 243 in the first direction X. In the feeder unit 240, the power feeding unit 247 is arranged on the one side in the second direction Y with respect to the feeder support plate 243.

As described above, in the present embodiment, the mechanical blocking unit 2, the arrester unit 3, and the commutation device 4 are arranged side by side in the first direction X.
According to this configuration, it is a place where the layout of the offshore platform or the like is limited, and for example, the mechanical shutoff unit 2, the arrester unit 3, and the commutation device 4 cannot be collectively arranged as in the first embodiment. The DC circuit breaker 1 can be arranged even in a place.

In the above embodiment, as an example of the discharge type injector, the triggertron method that induces dielectric breakdown by generating a minute discharge and the electric field distortion method that induces dielectric breakdown by distorting an electric field have been described. , But not limited to this. For example, as the discharge type injector, a laser trigger method may be applied in which a dielectric breakdown is induced by irradiating a laser between electrodes to ionize the insulating medium. However, since the laser oscillator is expensive, the triggertron method and the electric field distortion method are advantageous from the viewpoint of suppressing the equipment cost. Further, in the triggertron method, the trigger electrode is easily worn due to minute discharge, so that the electric field distortion method and the laser trigger method are advantageous from the viewpoint of the life of the injector.

Further, in the above embodiment, the injector unit includes a pair of injectors, but the invention is not limited to this. The injector unit may include only one injector or three or more injectors. The dosing unit may also include both a discharge dosing device and a mechanical dosing device.

Further, in the above-described embodiment, the mechanical shutoff unit 10 includes a pair of single shutoff units 11, but the invention is not limited to this. The mechanical interruption unit may include only one single interruption unit or three or more interruption units. Further, the mechanical interrupting unit may include only the vacuum interrupter 11A or only the gas disconnector 11B as the single interrupting unit 11.

According to at least one embodiment described above, the commutation circuit connected in parallel to the mechanical contact module is formed by connecting the reactor, the capacitor bank, and the injector in series. This eliminates the need for a semiconductor circuit breaker connected in parallel to the mechanical contact module as in the prior art, so that the device cost can be suppressed. Furthermore, since the injector of the commutation device is a high-speed injector, the current flowing through the mechanical contact module can be interrupted at a speed equivalent to that of the configuration using the semiconductor circuit breaker as in the prior art. As described above, it is possible to provide a DC circuit breaker capable of shortening the current interruption time and suppressing the equipment cost.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. The embodiments and their modifications are included in the scope of the invention and the scope thereof, and are included in the invention described in the claims and the scope of equivalents thereof.

Claims (14)

1. Equipped with a mechanical breaker, arrester and commutation device,
   The mechanical cutoff unit,
   At least one mechanical shutoff unit having at least one single shutoff;
   Insulating struts supporting said at least one mechanical shutoff unit;
   Equipped with
   Each of the at least one single blocker is
   A mechanical contact part that has a fixed contact and a movable contact, and is electrically insulated from the ground,
   A hermetically sealed container that is filled with the mechanical contact portion and an insulating gas and is electrically insulated from the ground,
   An operation rod connected to the movable contactor and extending from the inside of the closed container to the outside,
   An operation mechanism connected to the operation rod, which brings the movable contact into contact with and separates from the fixed contact, and which is provided at the same potential as the movable contact,
   Have
   The at least one single body breaking unit includes a first single body breaking unit and a second single body breaking unit,
   In the first single body breaking unit and the second single body breaking unit, the respective operating rods operate on the same straight line by the operating mechanism, and the operating directions of the operating rods by the operating mechanism are opposite to each other. And the operation mechanisms are arranged so as to face each other,
   All said at least one single breaks are connected in series to form a mechanical contact module,
   Both ends of the mechanical contact module are connected to a DC transmission system,
   The arrester is connected in parallel to the mechanical contact module,
   The commutation device has a commutation circuit formed by connecting a reactor, a capacitor, and a charger in series,
   The commutation circuit is connected in parallel to the mechanical contact module,
   The injector is a high speed injector,
   DC circuit breaker.
2. The injector is a discharge-type injector that starts energization by lowering the insulation performance between a pair of fixed electrodes and causing dielectric breakdown.
   The DC circuit breaker according to claim 1.
3. The commutation device comprises a feeder support plate in which the feeder is arranged,
   The injector is
   A container that houses the pair of electrodes,
   A trigger electrode disposed in the container,
   While applying a pulse voltage between one of the pair of electrodes and the trigger electrode, a pulse power supply provided at the same potential as the one,
   Equipped with
   The feeder support plate is formed of a metal material, and is provided at the same potential as the pulse power source,
   At least a portion of the container is disposed horizontally outside the feeder support plate,
   The DC circuit breaker according to claim 2.
4. The injector is a mechanical injector that drives a pair of contacts that are separated from each other by an electromagnetic repulsive force to bring them into contact with each other to energize them.
   The DC circuit breaker according to claim 1.
5. The commutation device comprises a feeder support plate in which the feeder is arranged,
   The injector is
   A container that houses the pair of contacts,
   While bringing the pair of contacts into and out of contact with each other, an operation mechanism for an injector provided at the same potential as one of the pair of contacts,
   Equipped with
   The feeder support plate is formed of a metal material, and is provided at the same potential as the operating mechanism for the feeder,
   At least a portion of the container is disposed horizontally outside the feeder support plate,
   The DC circuit breaker according to claim 4.
6. The commutation device includes a resistor that electrically connects the capacitor and the thrower, and the ground.
   The DC circuit breaker according to any one of claims 1 to 5.
7. The commutation device comprises a DC power supply for applying a voltage across the capacitor.
   The DC circuit breaker according to any one of claims 1 to 5.
8. The mechanical cutoff portion and the arrester are arranged side by side in the first direction when viewed from the vertical direction,
   The commutation device is arranged side by side in the second direction orthogonal to the first direction when viewed from the vertical direction, with respect to the mechanical interruption unit and the arrester.
   The DC circuit breaker according to any one of claims 1 to 7.
9. The reactor, the condenser, and the injector are arranged at the same position in the second direction,
   The DC circuit breaker according to claim 8.
10. The mechanical cutoff unit includes an insulating transformer that supplies electric power to the operation mechanism,
    The isolation transformer is arranged between the at least one mechanical interruption unit and the commutation device,
    The DC circuit breaker according to claim 8 or 9.
11. The mechanical shutoff unit, the arrester, and the commutation device are arranged in line.
    The DC circuit breaker according to any one of claims 1 to 7.
12. The at least one mechanical shutoff unit includes a mechanical shutoff unit support plate on which the first single shutoff unit and the second single shutoff unit are disposed and which is supported by the insulating column.
    The mechanical block support plate is formed of a metal material, and is provided at the same potential as the operating mechanism,
    At least a part of the closed container of the first single body blocking portion is disposed outside the mechanical blocking portion support plate in the horizontal direction,
    At least a part of the closed container of the second single body blocking part is arranged outside the mechanical blocking part support plate in a horizontal direction,
    The DC circuit breaker according to any one of claims 1 to 11.
13. Each of the closed containers of the first single-piece breaking unit and the second single-piece breaking unit includes a flange that is electrically connected to the movable contact,
    Each of the operation rods of the first single body breaking unit and the second single body breaking unit includes a rod insulating unit that blocks conduction between the movable contactor and the operating mechanism,
    The at least one mechanical shutoff unit comprises:
    A mechanical blocking section support plate on which the first single blocking section and the second single blocking section are arranged and which is supported by the insulating column;
    A conduction member electrically connecting the respective flanges of the first single body breaking portion and the second single body breaking portion,
    It is interposed between the mechanical blocking section support plate and the flange of one of the first single block section and the second single block section to block electrical connection between the one flange and the mechanical block support plate. Insulation part,
    Equipped with
    The other flange of the first single-piece breaking unit and the second single-piece breaking unit is electrically connected to the mechanical-breaking unit support plate,
    The DC circuit breaker according to any one of claims 1 to 12.
14. The sealed container of each of the first single body blocking section and the second single body blocking section includes a flange,
    Each of the operation rods of the first single body breaking unit and the second single body breaking unit includes a rod insulating unit that blocks conduction between the movable contactor and the operating mechanism,
    The at least one mechanical shutoff unit comprises:
    A mechanical blocking section support plate on which the first single blocking section and the second single blocking section are arranged and which is supported by the insulating column;
    A conduction member electrically connecting the respective flanges of the first single body breaking portion and the second single body breaking portion,
    It is interposed between the mechanical blocking section support plate and the flange of one of the first single block section and the second single block section to block electrical connection between the one flange and the mechanical block support plate. Insulation part,
    The first contact breaker and the second contact breaker, the movable contactor, the flange, the operating mechanism, and the mechanical breaker support plate have the same potential.
    The DC circuit breaker according to any one of claims 1 to 12.

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