JP6710811B2 - DC breakers and mechanical breakers for DC breakers - Google Patents

Description

Embodiments of the present invention relate to a DC circuit breaker, a mechanical circuit breaker for a DC circuit breaker, and a semiconductor circuit breaker for 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 transmission network in which three or more bases are connected to each other, it is necessary to have a device that can quickly cut off the fault point from a healthy system when an accident occurs in the power transmission network. 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.

In order 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.

Further, when an accident occurs, an opening command is given to the mechanical contact type disconnecting switch at the same time when the auxiliary semiconductor circuit breaker is turned off. 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 energization is only the conduction loss of the auxiliary semiconductor circuit breaker, the steady energization path is limited to the semiconductor circuit breaker capable of independently interrupting 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, there has been proposed a DC circuit breaker 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.

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 is constituted only by the mechanical contact type circuit breaker, so that the conduction loss can be greatly reduced.

A general mechanical contact type circuit breaker has a fixed contact and a movable contact that can be contacted and separated, a metal tank that encloses the fixed contact and the movable contact inside, and a movable contact that separates from the fixed contact. And an operating mechanism that is driven to. The inside of the metal tank is filled with an insulating medium. The metal tank is grounded and electrically insulated from the fixed contact and the movable contact. The operation mechanism is grounded and arranged outside the metal tank, and is connected to a movable contact in the metal tank through a seal rod that penetrates the metal tank and an insulating operation rod that is connected to the seal rod in the metal tank. ing.

By the way, as the DC power transmission system becomes higher in voltage, it is necessary for the mechanical contact type circuit breaker to have improved withstand voltage performance in each part. That is, in the mechanical contact type circuit breaker described above, it is necessary to widen the distance between the fixed contact and the movable contact of the high-voltage section and the grounded metal tank to electrically insulate with the increase in voltage. Further, when the desired breaking performance cannot be obtained with one mechanical contact type circuit breaker due to the increase in voltage, a plurality of mechanical contact type circuit breakers may be connected in series to improve the breaking performance. Also in this case, in all the mechanical contact type circuit breakers connected in series, it is necessary to widen the distance between the fixed contact and the movable contact of the high voltage part and the grounded metal tank to electrically insulate them. As a result, the mechanical contact type circuit breaker becomes large. The DC circuit breaker is assumed to be operated on a platform built offshore, and the cost of building the platform may increase due to the increase in size of the mechanical contact type circuit breaker. Furthermore, as the voltage increases, the length of the insulating rod that connects the movable contact of the high voltage section and the grounded operating mechanism also increases. As a result, since the mass of the movable portion of the operating mechanism increases, the opening speed of the fixed contact and the movable contact may decrease, and the responsiveness of the breaking operation may decrease.

Japanese Patent Laid-Open No. 2016-187275 International publication 2011/057675 pamphlet International publication 2013/131582 pamphlet

The problem to be solved by the present invention is to increase the voltage easily, suppress the increase in size, and ensure the response of the breaking operation, the mechanical breaker for the DC breaker, and the semiconductor for the DC breaker. The purpose is to provide a blocking device.

The DC circuit breaker of the embodiment has a mechanical circuit breaker, a semiconductor circuit breaker, and a commutation device. The mechanical shutoff unit has at least one mechanical shutoff unit and an insulating post that supports the at least one mechanical shutoff unit. The mechanical interruption unit has at least one single interruption unit. The single cutoff portion has a mechanical contact portion, 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. The semiconductor blocking unit has a semiconductor module and an arrester. The semiconductor module has a semiconductor stack in which a plurality of self-excited semiconductor elements are connected in series. The arrester is connected in parallel to the semiconductor module. The commutation device has a commutation circuit and a commutation adjusting reactor. The commutation circuit is configured by connecting a pair of legs in which a pair of self-excited semiconductor elements are connected in series and a capacitor in parallel. The commutation adjusting reactor is connected in series with the commutation circuit. The mechanical breaker has a current break contact and a high withstand voltage contact. The high withstand voltage contact has higher or equal withstand voltage performance than the current breaking contact. At least one machine interruption unit further has a machine interruption part support plate. At least one single block unit is disposed on the mechanical block support plate. The mechanical blocking unit support plate is supported by the insulating column. The mechanical block support plate is provided at the same potential as the operating mechanism. At least one single body breaking unit has a first single body breaking unit and a second single body breaking unit. The first unit breaking portion forms one of a current breaking contact and a high withstand voltage contact. The second single body breaking portion forms one of a current breaking contact and a high withstand voltage contact. The first single body breaking unit and the second single body breaking unit are arranged so that the respective operating rods operate on the same straight line by the operating mechanism. The first single body breaking unit and the second single body breaking unit are arranged such that the operating rods of the operating mechanism move in opposite directions. The first single body breaking unit and the second single body breaking unit are arranged such that their respective operating mechanisms face each other. At least a part of the closed container of the first single body blocking section is arranged outside the mechanical blocking section support plate in the horizontal direction. At least a part of the closed container of the second single body blocking portion is arranged outside the mechanical blocking portion support plate in the horizontal direction. The current breaking contact and the high withstand voltage contact 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 commutation circuit and the commutation adjusting reactor are connected in parallel to the current breaking contact. The commutation circuit is connected to the high withstand voltage contact side of the commutation adjusting reactor. The semiconductor module is connected in parallel with the high withstand voltage contact and the commutation circuit.

The perspective view which shows the DC circuit breaker of 1st Embodiment. The perspective view which shows the direct-current circuit breaker of 1st Embodiment typically. The perspective view which shows the machine interruption|blocking part of 1st Embodiment. Sectional drawing which shows a high withstand voltage contact. Sectional drawing which shows a current interruption contact. The perspective view which shows the machine interruption part of 1st Embodiment typically. The perspective view which shows the semiconductor interruption|blocking part of 1st Embodiment. The perspective view which shows the semiconductor interruption part of 1st Embodiment typically. The perspective view which shows the commutation apparatus of 1st Embodiment. The circuit diagram which shows a commutation circuit. The perspective view which shows the commutation apparatus of 1st Embodiment typically. The circuit diagram showing the direct-current circuit breaker of a 1st embodiment typically. Sectional drawing which shows the modification of a high withstand voltage contact. The front view which shows the machine interruption part of 2nd Embodiment typically. The front view which shows the machine interruption|blocking part of 3rd Embodiment typically. The front view which shows the machine interruption part of 4th Embodiment typically. The front view which shows the machine interruption part of 5th Embodiment typically.

Hereinafter, a DC circuit breaker, a mechanical circuit breaker for a DC circuit breaker, and a semiconductor circuit breaker for a DC circuit breaker according to embodiments 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 perspective view schematically 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 (mechanical circuit breaker), a semiconductor circuit breaker 3 (semiconductor circuit breaker), and a commutation device 4.

FIG. 3 is a perspective view showing the mechanical shutoff unit of the first embodiment.
As shown in FIGS. 1 and 3, the mechanical shutoff unit 2 includes a plurality (four in the illustrated example) of mechanical shutoff units 10 and a plurality (four in the illustrated example) of insulation for supporting the mechanical shutoff unit 10. The column 12 is provided. The plurality of mechanical shutoff units 10 are stacked in a plurality of stages in the vertical direction on the insulating column 12.

The mechanical shutoff unit 10 includes a pair of single shutoff units 14, a power supply unit 30, a control unit 31, a pair of single shutoff units 14 (first and second single shutoff units), a power supply unit 30, and a control unit. And a machine blocking portion support plate 33 on which 31 is fixedly arranged. The single breaking unit 14 constitutes a high withstand voltage contact 14A or a current breaking contact 14B. In the present embodiment, the mechanical interruption unit 10 includes only the high withstand voltage contact 14A or only the current interruption contact 14B. Specifically, the uppermost mechanical breaking unit 10 includes a pair of current breaking contacts 14B. Further, the other mechanical interruption unit 10 includes a pair of high withstand voltage contacts 14A. The high withstand voltage contact 14A is preferably a disconnector having higher withstand voltage performance than or equivalent to the current breaking contact 14B. The current breaking contact 14B is preferably a circuit breaker having a higher current breaking performance than the high withstand voltage contact 14A. The disconnector having high withstand voltage performance is, for example, a gas disconnector having a gas contact. The circuit breaker having a high current breaking performance is, for example, a vacuum circuit breaker having a vacuum valve.

FIG. 4 is a sectional view showing the high withstand voltage contact.
As shown in FIG. 4, the mechanical contact portion 16 of the single breaker 14 that constitutes the high withstand voltage contact 14A is a gas contact. The single breaking unit 14 that constitutes the high-voltage contact 14A includes a mechanical contact unit 16 having a fixed contact 17 and a movable contact 18, a sealed container 20 enclosing the mechanical contact 16 and an insulating gas, and a fixed contact. 17, a fixed rod 25 connected to the movable contact 18, an operating rod 26 connected to the movable contact 18, an operating mechanism 27 connected to the operating rod 26, and a capacitor 29 connected in parallel to the mechanical contact portion 16 (see FIG. 1 and FIG. 3).

The mechanical contact portion 16 is a contact having high withstand voltage performance. The fixed contact 17 and the movable contact 18 are provided so that they can come into contact with and separate from each other. The mechanical contact portion 16 opens by separating the fixed contact 17 and the movable contact 18. The energization path passing through the mechanical contact portion 16 is opened by separating the fixed contact 17 and the movable contact 18. In the following description of the high withstand voltage contact 14A, the direction in which the fixed contact 17 and the movable contact 18 come into contact with and separate from each other is referred to as a first direction. In this embodiment, the first direction is one horizontal direction.

The closed container 20 is filled with, for example, sulfur hexafluoride (SF ₆ ) gas as an insulating gas. The closed container 20 includes a cylindrical insulating cylinder 21, and a first flange 22 and a second flange 23 that close the openings at both ends of the insulating cylinder 21. The insulating cylinder 21 extends along the first direction. The insulating cylinder 21 is a porcelain tube formed of, for example, an insulating material. The first flange 22 and the second flange 23 are each made of a metal material.

The fixed rod 25 is made of a metal material. The fixed rod 25 extends along the first direction. The fixed rod 25 connects the first flange 22 and the fixed contactor 17 in the closed container 20. The fixed rod 25 may be formed integrally with the fixed contactor 17. The fixed rod 25 electrically connects the fixed contact 17 and the first flange 22.

The operation rod 26 is entirely formed of, for example, a metal material. The operation rod 26 extends along the first direction. The operation rod 26 is connected to the movable contact 18 inside the closed container 20, and extends to the outside of the closed container 20 through a through hole 23 a provided in the second flange 23. The operation rod 26 may be formed integrally with the movable contact 18. The operation rod 26 is provided slidably with respect to the second flange 23 while maintaining the airtightness inside the closed container 20. The operating rod 26 electrically connects the movable contact 18 and the second flange 23.

The operation mechanism 27 is a highly responsive electromagnetic actuator that uses a power source as electric power. The electromagnetic actuator is, for example, an electromagnetic repulsion operation mechanism. The electromagnetic repulsion operation mechanism has a metal plate of good conductor connected to the operation rod 26, 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 a reverse induced current in the metal plate, and a repulsive force in the reverse direction to the coil is applied to the metal plate to operate the operation rod 26. The operation mechanism 27 is arranged side by side with the second flange 23 in the first direction outside the closed container 20. The operation mechanism 27 is fixed to the second flange 23 via the support portion 28. The supporting portion 28 is entirely formed of a metal material, for example. The operating mechanism 27 causes the operating rod 26 to reciprocate in the first direction. As a result, the operation mechanism 27 displaces the movable contactor 18 connected to the operation rod 26 to bring the movable contactor 18 into contact with and separate from the fixed contactor 17.

As shown in FIGS. 1 and 3, the condenser 29 is arranged outside the closed container 20. The capacitor 29 is connected to the first flange 22 and the second flange 23. The capacitor 29 has a high-resistance cylinder filled with a dielectric material and electrodes at both ends, and has a capacitance and a resistance. The capacitor 29 adjusts the voltage applied to the mechanical contact portion 16 (see FIG. 4) when the current is cut off and in the open state.

FIG. 5 is a sectional view showing the current breaking contact.
As shown in FIG. 5, the mechanical contact portion 36 of the single unit breaking portion 14 that constitutes the current breaking contact 14B is a vacuum valve. The single breaking unit 14 that constitutes the current breaking contact 14B includes a mechanical contact unit 36 that is a vacuum valve 44 having a fixed contact 37 and a movable contact 38, a sealed container 40 that encloses the mechanical contact 36, and a fixed contact. A fixed rod 45 connected to 37, an operating rod 46 connected to the movable contact 38, an operating mechanism 47 connected to the operating rod 46, and a capacitor 49 connected in parallel to the mechanical contact portion 36 (Fig. 1 and FIG. 3).

The mechanical contact portion 36 is a contact capable of mechanically interrupting the current at the current zero point. The fixed contactor 37 and the movable contactor 38 are provided so that they can come into contact with and separate from each other. The mechanical contact portion 36 opens by separating the fixed contact 37 and the movable contact 38. The energization path passing through the mechanical contact portion 36 is opened by separating the fixed contact 37 and the movable contact 38. In the following description of the current interruption contact 14B, the direction in which the fixed contact 37 and the movable contact 38 come into contact with and separate from each other is referred to as a second direction. In this embodiment, the second direction is one horizontal direction.

The vacuum valve 44 maintains a vacuum inside. The vacuum valve 44 includes a fixed contact 37, a movable contact 38, a cylindrical insulating cylinder 44a, a first flange 44b and a second flange 44c that close the openings at both ends of the insulating cylinder 44a, and the inside of the insulating cylinder 44a. And a bellows 44d provided on the. The insulating cylinder 44a extends along the second direction. The insulating tube 44a is a porcelain tube made of, for example, an insulating material. The first flange 44b and the second flange 44c are each made of a metal material.

The fixed contact 37 is connected to the first flange 44b in the vacuum valve 44. The fixed contact 37 is electrically connected to the first flange 44b. The movable contact 38 extends to the outside of the vacuum valve 44 through a through hole 44e provided in the second flange 44c. The movable contact 38 is slidably provided on the second flange 44c. The movable contact 38 is electrically connected to the second flange 44c.

The bellows 44d is arranged so as to surround the movable contact 38 inside the insulating cylinder 44a. One end of the bellows 44d is fixed to the second flange 44c. The other end of the bellows 44d is fixed to the peripheral surface of the movable contact 38. The bellows 44d disconnects the vacuum inside the vacuum valve 44 from the outside while allowing the movable contact 38 to be displaced in the second direction with respect to the insulating cylinder 44a.

The closed container 40 is filled with, for example, sulfur hexafluoride (SF6) gas as an insulating gas. The closed container 40 includes a cylindrical insulating cylinder 41, and a first flange 42 and a second flange 43 that close the openings at both ends of the insulating cylinder 41. The insulating cylinder 41 extends along the second direction. The insulating tube 41 is a porcelain tube formed of, for example, an insulating material. The first flange 42 and the second flange 43 are each made of a metal material.

The fixed rod 45 is made of a metal material. The fixed rod 45 extends along the second direction. The fixed rod 45 connects the first flange 42 and the first flange 44b in the closed container 40. The fixed rod 45 may be integrally formed with the first flange 44b. The fixed rod 45 electrically connects the fixed contact 37, the first flange 44b, and the first flange 42.

The operation rod 46 is, for example, entirely formed of a metal material. The operation rod 46 extends along the second direction. The operation rod 46 is connected to the movable contact 38 in the closed container 40, and extends to the outside of the closed container 40 through a through hole 43 a provided in the second flange 43. The operation rod 46 may be formed integrally with the movable contact 38. The operation rod 46 is provided slidably with respect to the second flange 43. The operation rod 46 electrically connects the movable contact 38 and the second flange 43.

The operation mechanism 47 is a highly responsive electromagnetic actuator that uses a power source as electric power. The electromagnetic actuator is, for example, an electromagnetic repulsion operation mechanism. The electromagnetic repulsion operation mechanism has a metal plate of good conductor connected to the operation rod 46, and a coil installed so as to face the metal plate. During driving, a current is applied to the coil to generate a reverse induced current in the metal plate, and a repulsive force in the reverse direction to the coil is applied to the metal plate to operate the operating rod 46. The operation mechanism 47 is arranged outside the closed container 40 along with the second flange 43 in the second direction. The operation mechanism 47 is fixed to the second flange 43 via the support portion 48. The support 48 is entirely formed of a metal material, for example. The operation mechanism 47 reciprocates the operation rod 46 in the second direction. As a result, the operation mechanism 47 displaces the movable contact 38 connected to the operation rod 46, and brings the movable contact 38 into contact with and separates from the fixed contact 37.

As shown in FIGS. 1 and 3, the condenser 49 is arranged outside the closed container 40. The capacitor 49 is connected to the first flange 42 and the second flange 43. The capacitor 49 has a high-resistance cylinder filled with a dielectric material and electrodes provided at both ends, and has a capacitance and a resistance. The capacitor 49 adjusts the voltage applied to the mechanical contact portion 36 (see FIG. 5) when the current is cut off and in the open state.

As shown in FIG. 1, FIG. 3, FIG. 4, and FIG. 5, in each machine interruption unit 10, the pair of unit interruption sections 14 arranged on the machine interruption section support plate 33 are operated by respective operation rods 26 and 46. The mechanical contacts 27 and 47 are arranged so as to operate on the same straight line when the mechanical contacts 16 and 36 are opened. Specifically, in each machine interruption unit 10, the operation rods 26 and 46 of each single interruption unit 14 extend on the same straight line. Further, in each machine interruption unit 10, the pair of unit interruption sections 14 arranged on the machine interruption section support plate 33 includes the operation rods 26, 46 when the mechanical contact sections 16, 36 are opened by the operation mechanisms 27, 47. Are arranged so that their operating directions are opposite to each other. Specifically, the pair of single-piece breaking units 14 arranged on the mechanical breaking unit support plate 33 are arranged so that the respective operating mechanisms 27 and 47 face and contact each other. Further, the single breaking unit 14 of the one mechanical breaking unit 10 and the single breaking unit 14 of the other mechanical breaking unit 10 are arranged so as to operate on the same straight line when viewed in the vertical direction.

Further, in each machine interruption unit 10, the sealed containers 20 and 40 of the pair of unit interruption units 14 arranged on the machine interruption unit support plate 33 are arranged outside the machine interruption unit support plate 33 in the horizontal direction. In the illustrated example, the entire hermetically sealed containers 20 and 40 are horizontally arranged outside the machine blocking unit support plate 33, but only a part of the hermetically sealed containers 20 and 40 is horizontally supported to the mechanical blocking unit. It may be arranged outside the plate 33. Specifically, it suffices that the locations (for example, the first flanges 22 and 42) having the same potential as the fixed contacts 17 and 37 in the closed containers 20 and 40 are arranged outside the machine blocking portion support plate 33 in the horizontal direction.
Here, the arrangement in the horizontal direction on the outer side of the mechanical block supporting plate 33 will be described with another expression with reference to FIG.
For example, if the first 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 33 are defined. be able to. It suffices that at least a part of the hermetically sealed containers 20, 40 is arranged so as to project from the space (the space on the side where the operation mechanisms 27, 47 are present) partitioned by the two vertical projection planes.

In each of the single breaking portions 14, the mechanical contact portions 16 and 36 are electrically insulated from the ground. Further, in each single breaking unit 14, the operating mechanisms 27, 47 are provided at the same potential as the movable contactors 18, 38 of the mechanical contact units 16, 36 and the mechanical breaking unit support plate 33. Specifically, the operating mechanisms 27 and 47 are provided so that the reference potential becomes the same potential as that of the movable contacts 18 and 38 of the mechanical contact portions 16 and 36 and the mechanical blocking portion support plate 33.

In each of the single cutoff portions 14, the sealed containers 20 and 40 are electrically insulated from the ground. Further, the sealed containers 20 and 40 electrically insulate the fixed contacts 17 and 37 from the movable contacts 18 and 38 when the mechanical contacts 16 and 36 are opened.

As shown in FIGS. 1 and 3, the power supply unit 30 supplies electric power to the operation mechanisms 27 and 47 of the pair of single unit breaking units 14 arranged on the same mechanical breaking unit support plate 33. The power supply unit 30 is provided so that the reference potential becomes the same potential as the operating mechanisms 27 and 47. The power supply unit 30 includes, for example, a capacitor that supplies power to the operating mechanisms 27 and 47 when the mechanical contact units 16 and 36 (see FIGS. 4 and 5) are opened, and a mechanical contact unit 16 and 36 that is closed. It is provided with capacitors for supplying power to the operating mechanisms 27, 47, a charging device for each capacitor, and a switching element for holding each capacitor in a charged state and discharging it when power is supplied (both not shown). .. For supplying power from the ground to the charging device, for example, a power supply device capable of supplying power while electrically insulating the ground from the power supply unit 30, such as an insulating transformer, a laser power supply device, and an electromagnetic induction wireless power supply device. Used (all not shown).

The control unit 31 monitors the states of the power supply unit 30 and the operating mechanisms 27 and 47 arranged on the same machine blocking unit support plate 33. Further, the control unit 31 controls the power supply from the power supply unit 30 arranged on the same mechanical interruption unit support plate 33 to the operation mechanisms 27 and 47.

As shown in FIGS. 1 and 3, for example, the mechanical blocking portion support plate 33 is made of a metal material such as an aluminum alloy. The mechanical blocking section support plate 33 is formed in a rectangular shape in plan view. The mechanical blocking unit support plate 33 is stacked in a plurality of layers in the vertical direction on the insulating support column 12. The mechanical blocking section support plate 33 is installed parallel to the direction (first direction) in which the single blocking section 14 performs the blocking operation.

The insulating column 12 is made of, for example, an insulator, a polymer, a fiber reinforced plastic, or the like. The insulating column 12 is erected on the foundation 5. The insulating column 12 extends along the vertical direction. Each insulating support 12 supports a corner portion of each mechanical blocking portion support plate 33 stacked in a plurality of stages. The insulating column 12 electrically insulates the plurality of mechanical shutoff units 10 from each other and also mechanically connects the mechanical shutoff units 10 to the foundation 5 while electrically insulating them.

The length of the insulating support column 12 is set so as to insulate the machine interrupting units 10 adjacent to each other in the vertical direction when the current is interrupted and to electrically insulate the entire mechanical interrupting unit 10 from the ground when energized. .. That is, the length of the portion of the insulating column 12 provided between the pair of vertically adjacent mechanical interruption units 10 is set so that the mechanical interruption units 10 can be electrically insulated from each other when the current is interrupted. .. Further, the length of the portion of the insulating column 12 provided between the mechanical cutoff unit 10 located at the lowermost position and the foundation 5 is such that the plurality of mechanical cutoff units 10 are electrically insulated from the ground when energized. It is set to be possible.

In the present embodiment, the length of the portion of the insulating column 12 provided between the mechanical blocking unit 10 located at the lowermost position and the foundation 5 is provided between the pair of mechanical blocking units 10 that are adjacent in the vertical direction. It is longer than the length of the part. In addition, the length of the portion of the insulating column 12 provided between the mechanical blocking unit 10 located at the lowermost position and the foundation 5 is the same as that of the portion provided between the pair of mechanical blocking units 10 that are adjacent in the vertical direction. Shorter than the total length. It should be noted that each insulating support column 12 may extend continuously from the lower end to the upper end, or may be divided into a plurality of parts so as to sandwich each machine blocking part support plate 33.

FIG. 6 is a perspective view schematically showing the mechanical shutoff unit of the first embodiment. Note that, in FIG. 6, the pair of single-piece breaking sections 14 arranged on the mechanical-breaking-section supporting plate 33 are regarded as one single piece breaking section 14. Further, in FIG. 6, the power supply unit 30 and the control unit 31 of each machine interruption unit 10 are not shown.
As shown in FIGS. 1, 3 and 6, the pair of single unit breaking portions 14 in each mechanical breaking unit 10 are connected in series by an in-unit bus bar 51 that connects the second flanges 23 and 43. In an arbitrary pair of machine interruption units 10 that are vertically adjacent to each other, the first flanges 22 and 42 of the first unit interruption unit 14 of the first machine interruption unit 10 and the second unit interruption unit 14 of the second machine interruption unit 10 are included. The first flanges 22 and 42 are connected to each other in series by an inter-unit bus bar 52. That is, when the pair of single-body breaking units 14 in each machine-breaking unit 10 is regarded as one single-body breaking unit 14, each single-body breaking unit 14 is different from the single-body breaking units 14 of the machine-breaking units 10 that are vertically adjacent to each other. The first flanges 22 are connected to each other in series, and an inter-unit bus bar 52 that connects the first flanges 22 and 42 is connected in series. Thereby, the plurality of high withstand voltage contacts 14A and the plurality of current interruption contacts 14B are connected in series by the intra-unit bus bar 51 and the inter-unit bus bar 52 to form the mechanical contact module 34. In this configuration, all high withstand voltage contacts 14A are connected in series with each other. Further, all the current interruption contacts 14B are connected in series with each other.

As shown in FIG. 6, the mechanical contact module 34 is provided with a first connection point A1, a second connection point A2, and a third connection point A3. The first connection point A1 is formed at an end of the mechanical contact module 34 where the current interruption contact 14B is provided. The second connection point A2 is formed at an end of the mechanical contact module 34 opposite to the first connection point A1. The third connection point A3 is an electrical connection point between the high withstand voltage contact 14A and the current interruption contact 14B. The first connection point A1 and the second connection point A2 are connected to a DC power transmission system.

FIG. 7 is a perspective view showing the semiconductor blocking portion of the first embodiment.
As shown in FIGS. 1 and 7, the semiconductor blocking section 3 is provided on the foundation 5 side by side with the mechanical blocking section 2. The semiconductor blocking unit 3 includes a plurality (three in the illustrated example) of semiconductor blocking units 60 and a plurality of (four in the illustrated example) insulating columns 62 that support the semiconductor blocking unit 60. The plurality of semiconductor blocking units 60 are stacked in a plurality of stages in the vertical direction on the insulating column 62.

The semiconductor blocking unit 60 includes a pair of semiconductor modules 64, an arrester 68, and a semiconductor blocking section support plate 70 on which the pair of semiconductor modules 64 and the arrester 68 are fixedly arranged.

The semiconductor module 64 includes a semiconductor stack 65 in which a plurality of self-excited semiconductor elements 65 a are connected in series, a diode 66 connected in parallel to the semiconductor stack 65, and an accessory circuit 67 connected to the semiconductor stack 65. The self-excited semiconductor element 65a is, for example, an IGBT (Insulated Gate Bipolar Transistor) or an IEGT (Injection Enhanced Gate Transistor). The semiconductor stack 65 and the diode 66 are connected in parallel so that the forward directions of current flow are opposite to each other. The auxiliary circuit 67 includes a snubber circuit that equalizes the voltage distribution of the self-excited semiconductor elements 65a of the semiconductor stack 65, and a gate unit that outputs a switching command to the self-excited semiconductor elements 65a. In each semiconductor blocking unit 60, the pair of semiconductor modules 64 are connected in series so that the forward directions of the respective semiconductor stacks 65 are opposite to each other.

FIG. 8 is a perspective view schematically showing the semiconductor blocking section of the first embodiment.
As shown in FIGS. 1, 7 and 8, the arrester 68 is connected in parallel to a pair of semiconductor modules 64 arranged on the same semiconductor blocking portion support plate 70. A current temporarily flows through the arrester 68 in a state where the pair of semiconductor modules 64 are in the non-conductive state. The arrester 68 converts an electric current into heat energy.

As shown in FIGS. 1 and 7, for example, the semiconductor blocking portion support plate 70 is formed of an insulating material such as fiber reinforced plastic or a metal material such as an aluminum alloy. The semiconductor blocking portion support plate 70 is formed so as to insulate both ends of the semiconductor module 64 and both ends of the arrester 68, and to support the semiconductor module 64 and the arrester 68 on the insulating support column 62. The semiconductor blocking portion support plate 70 is stacked in a plurality of layers in the vertical direction on the insulating support column 62.

The insulating support column 62 is formed of, for example, an insulator, polymer, fiber reinforced plastic, or the like. The insulating columns 62 are erected on the foundation 5. The insulating support columns 62 extend along the vertical direction. Each insulating pillar 62 supports a corner portion of each semiconductor blocking portion support plate 70 stacked in a plurality of stages. The insulating column 62 electrically insulates the plurality of semiconductor blocking units 60 from each other and also mechanically connects the semiconductor blocking units 60 to the base 5 while electrically insulating them.

The length of the insulating support column 62 is set so as to be able to insulate the semiconductor breaking units 60 adjacent to each other in the vertical direction when the current is cut off and to electrically insulate the entire semiconductor breaking unit 60 from the ground when the current is applied. .. That is, the length of the portion of the insulating support column 62 provided between the pair of semiconductor blocking units 60 adjacent in the vertical direction is set so that the semiconductor blocking units 60 can be electrically insulated from each other when the current is cut off. .. In addition, the length of the portion of the insulating support column 62 provided between the lowermost semiconductor blocking unit 60 and the foundation 5 is such that the entire plurality of semiconductor blocking units 60 are electrically insulated from the ground when energized. It is set to be possible.

In the present embodiment, the length of the portion of the insulating pillar 62 provided between the semiconductor blocking unit 60 located at the lowermost position and the foundation 5 is provided between the pair of semiconductor blocking units 60 that are vertically adjacent to each other. It is longer than the length of the part. Further, the length of the portion of the insulating pillar 62 provided between the semiconductor blocking unit 60 located at the lowermost position and the foundation 5 is the same as that of the portion provided between the pair of semiconductor blocking units 60 that are adjacent in the vertical direction. Shorter than the total length. It should be noted that each insulating support column 62 may extend continuously from the lower end to the upper end, or may be divided into a plurality of parts so as to sandwich each semiconductor blocking part support plate 70.

As shown in FIGS. 1, 7 and 8, when the pair of semiconductor modules 64 of each semiconductor blocking unit 60 are regarded as one semiconductor module 64, the plurality of semiconductor modules 64 are connected in series by the plurality of bus bars 72. ing. Specifically, the semiconductor module 64 is connected in series by the bus bar 72 to the semiconductor modules 64 in the semiconductor blocking units 60 that are vertically adjacent to each other. Here, all the semiconductor modules 64 connected in series are referred to as a semiconductor module group. As shown in FIG. 8, a first connection point B1 and a second connection point B2 are formed in the semiconductor blocking section module group. The first connection point B1 is formed at one end of the semiconductor blocking unit module group. The second connection point B2 is formed at the other end of the semiconductor blocking section module group.

FIG. 9 is a perspective view showing the commutation device of the first embodiment.
As shown in FIGS. 1 and 9, the commutation device 4 includes a commutation circuit 80, a commutation adjusting reactor 86, and a commutation device support plate 88 on which the commutation circuit 80 and the commutation adjusting reactor 86 are fixedly arranged. And an insulating column 90 that supports the commutation device support plate 88.

FIG. 10 is a circuit diagram showing a commutation circuit.
As shown in FIGS. 1, 9 and 10, the commutation circuit 80 is a half-bridge circuit configured by connecting a pair of legs 82 in which a pair of self-excited semiconductor elements 82a are connected in series and a capacitor 84 in parallel. is there. The self-excited semiconductor element 82a is, for example, an IGBT or an IEGT. A diode 82b is connected in parallel to each self-excited semiconductor element 82a so that the forward directions of current flow are opposite to each other. The pair of legs 82 is connected to an unillustrated accessory circuit including a snubber circuit that equalizes the voltage distribution of the self-excited semiconductor element 82a and a gate unit that outputs a switching command to the self-excited semiconductor element 82a. .. One commutation circuit 80 may be provided, or a plurality of commutation circuits 80 may be provided and connected in series with each other. In the example shown in FIG. 1, one commutation circuit 80 is provided.

FIG. 11 is a perspective view schematically showing the commutation device according to the first embodiment.
As shown in FIGS. 1, 9 and 11, the commutation adjusting reactor 86 is connected in series to the commutation circuit 80 via a bus bar 92. The commutation adjustment reactor 86 adjusts the discharge time of the capacitor 84 of the commutation circuit 80.

As shown in FIG. 11, in the series of circuits formed by the commutation circuit 80 and the commutation adjusting reactor 86, a first connection point C1, a second connection point C2, and a third connection point C3 are formed. Has been done. The first connection point C1 is an electrical connection point between the commutation circuit 80 and the commutation adjusting reactor 86. The second connection point C2 is formed at an end of the commutation adjusting reactor 86 opposite to the first connection point C1. The third connection point C3 is formed at an end of the commutation circuit 80 opposite to the first connection point C1.

As shown in FIGS. 1 and 9, for example, the commutation device support plate 88 is formed of an insulating material such as fiber reinforced plastic or a metal material such as an aluminum alloy. The commutation device support plate 88 insulates both ends of the commutation circuit 80, insulates between the commutation circuit 80 and the commutation adjusting reactor 86 by means other than the bus bar 92, and the commutation circuit 80 and the commutation adjusting reactor 86. Is formed so as to be supported by the insulating column 90.
The insulating column 90 is made of, for example, an insulator, a polymer, a fiber reinforced plastic, or the like. The insulating column 90 is erected on the foundation 5. The insulating support column 90 extends along the vertical direction. Each insulating support 90 supports a corner of the commutation device support plate 88. The insulating column 90 mechanically connects the commutation device support plate 88 to the foundation 5 while electrically insulating the same. The length of the insulating column 90 is set so that the commutation circuit 80 and the commutation adjusting reactor 86 can be electrically insulated from the ground when energized.

The commutation device support plate 88 is arranged above the semiconductor blocking unit 3. Further, the insulating support column 90 of the commutation device 4 is also used as the insulating support column 62 of the semiconductor blocking unit 3. As a result, the commutation device 4 is stacked on top of the semiconductor blocking section 3. In this case, the insulating support column 90 electrically insulates the commutation circuit 80 and the commutation adjusting reactor 86 from the semiconductor interruption unit 60. The length of the portion of the insulating column 90 provided between the commutation device support plate 88 and the semiconductor interruption unit 60 disposed immediately below the commutation device support plate 88 is equal to the length of the commutation circuit 80 during current interruption. Also, the commutation adjusting reactor 86 and the semiconductor blocking unit 60 are set to be electrically insulated.

FIG. 12 is a circuit diagram schematically showing the DC circuit breaker of the first embodiment. In FIG. 12, the plurality of high withstand voltage contacts 14A connected in series are regarded as one high withstand voltage contact 14A. Further, in FIG. 12, the pair of current interruption contacts 14B connected in series to each other is shown as one current interruption contact 14B. In addition, FIG. 12 illustrates only a pair of semiconductor modules 64 that are connected in series among a plurality of semiconductor modules 64 that are connected in series.
As shown in FIGS. 2 and 12, a series of circuits formed by the commutation circuit 80 and the commutation adjusting reactor 86 are connected in parallel to the current breaking contact 14B. The commutation circuit 80 is connected to the high withstand voltage contact 14A side of the commutation adjustment reactor 86. Specifically, the second connection point C2 of the commutation device 4 and the first connection point A1 of the mechanical contact module 34 are electrically connected by the bus bar 94. The third connection point C3 of the commutation device 4 and the third connection point A3 of the mechanical contact module 34 are electrically connected by a bus bar 95.

The semiconductor module 64 is connected in parallel to a series of circuits formed by the high withstand voltage contact 14A and the commutation circuit 80. Specifically, the first connection point B1 of the semiconductor breaking unit 3 and the second connection point A2 of the mechanical contact module 34 are electrically connected by the bus bar 96. In addition, the second connection point B2 of the semiconductor blocking unit 3 and the first connection point C1 of the commutation device 4 are electrically connected by a bus bar 97.

Next, the operation of the DC circuit breaker 1 will be described with reference to FIGS. 1 to 12.
During steady power transmission of the DC power transmission system, the power transmission current flows through the mechanical contact module 34. In this state, no current flows through the semiconductor module 64, the commutation circuit 80, and the commutation adjusting reactor 86. Further, the capacitor 84 of the commutation circuit 80 is charged in advance by a power supply device (not shown) capable of supplying electric power while electrically insulating the ground and the commutation circuit 80.

When a fault current occurs in the DC power transmission system, a fault current is detected by a control device (not shown), a fault breaking command is given to the DC circuit breaker 1, and a high withstand voltage contact 14A and a current breaking contact 14B of the mechanical contact module 34 are provided. The respective mechanical contact parts 16 and 36 are opened. Specifically, a control device (not shown) gives an opening operation command to the control unit 31, supplies power from the power supply unit 30, drives the operation mechanisms 27 and 47 of the individual unit breaking units 14, and operates the individual unit breaking units. 14 is opened. At this time, in each machine shutoff unit 10, the pair of operation rods 26 and 46 operate on the same straight line in opposite directions, so that the impact force and reaction generated in the operation mechanisms 27 and 47 are offset.

Further, when opening each single-piece breaking unit 14, the self-excited semiconductor element 82a of the commutation circuit 80 is turned on (energized state) to discharge the electric charge of the capacitor 84. When the charge of the capacitor 84 is discharged, the current of the current breaking contact 14B connected in parallel to the commutation circuit 80 decreases, and a current zero point is generated at the current breaking contact 14B. As a result, the arc is extinguished at the current interruption contact 14B and the commutation is completed. In this state, the fault current flows through the high withstand voltage contact 14A, the commutation circuit 80, and the commutation adjusting reactor 86.

Next, the self-excited semiconductor element 65a of the semiconductor module 64 is turned on and the self-excited semiconductor element 82a of the commutation circuit 80 is turned off. As a result, the fault current commutates in the semiconductor module 64 connected in parallel to the commutation circuit 80. In this state, the fault current flows through the semiconductor module 64 and the commutation adjusting reactor 86.

Next, after waiting for the insulation recovery of the high withstand voltage contact 14A, the self-excited semiconductor element 65a of the semiconductor module 64 is switched off. When the self-excited semiconductor element 65a of the semiconductor module 64 is switched off, a fault current commutates to the arrester 68 connected in parallel with the self-excited semiconductor element 65a. As a result, the fault current is absorbed in the arrester 68, and the interruption of the fault current in the DC transmission system is completed.

In the present embodiment, the mechanical interruption unit 2 has mechanical contacts 16 and 36 electrically fixed from the ground, which have fixed contacts 17 and 37 and movable contacts 18 and 38, and mechanical contacts 16 and 36. Sealed containers 20 and 40 that are filled with an insulating gas and electrically insulated from the ground, operation rods 26 and 46 that are connected to the movable contacts 18 and 38, and operation rods 26 and 46 that are connected to mechanical contacts. A configuration is adopted in which the unitary breaking unit 14 including the movable contacts 18 and 38 of the units 16 and 36 and the operating mechanisms 27 and 47 provided at the same potential is used.
According to this configuration, since the closed containers 20 and 40 are not grounded to the ground, insulation between the closed containers 20 and 40 and the mechanical contact portions 16 and 36 can be omitted. Therefore, as compared with the case where the sealed container is electrically insulated from the mechanical contact portion by being grounded to the ground, the sealed containers 20 and 40 can be downsized, and the single cutoff portion 14 can be prevented from increasing in size. Further, even when a plurality of single-piece breaking units 14 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 14 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.
Furthermore, according to the above configuration, since the closed containers 20 and 40 and the operating mechanisms 27 and 47 are not grounded to the ground, the operating rods 26, which are interposed between the mechanical contact portions 16 and 36 and the operating mechanisms 27 and 47. The insulation of 46 can be omitted, and the lengthening of the operation rods 26 and 46 can be suppressed as compared with the case where the operation mechanism is electrically insulated from the mechanical contact portion by being grounded to the ground. As a result, an increase in the mass of the movable portion of the operating mechanism 27, 47 is suppressed, and a decrease in the opening speed of the mechanical contact portions 16, 36 can be suppressed. Therefore, it is possible to provide the DC circuit breaker 1 capable of ensuring the responsiveness of the breaking operation.

Further, in the pair of single-piece breaking units 14 in each machine breaking unit 10, the respective operating rods 26, 46 are operated on the same straight line by the operating mechanisms 27, 47, and the operating rods 26, 46 are operated by the operating mechanisms 27, 47. It is arranged so that the operation direction is opposite.
According to this configuration, it is possible to cancel the impact force and the recoil generated in the operation mechanisms 27 and 47 when the operation rods 26 and 46 are operated on the machine interruption part support plate 33 of each machine interruption unit 10. As a result, it is possible to suppress the occurrence of a bending moment in the insulating column 12 that supports the mechanical shutoff unit 10 when the operating mechanisms 27 and 47 are operating. 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 12, an increase in the support structure, and an increase in weight accompanying the increase.

Further, the pair of single-piece breaking units 14 arranged on the mechanical breaking unit support plate 33 are arranged so that the respective operating mechanisms 27, 47 face and contact each other.
According to this configuration, as compared with the configuration in which the respective closed containers 20 face each other and come into contact with each other, the impact force and the reaction generated in the operating mechanisms 27 and 47 when the operating rods 26 and 46 are operated are canceled out. , The impact force and the recoil are not canceled by the sealed container 20 made of the porcelain tube having a relatively low strength, but are directly canceled by the operating mechanisms 27, 47 made of a metal material having a relatively high strength. be able to. Therefore, it is possible to prevent a large force from being applied to the closed container 20. Thereby, the breakage of the single breaking unit 14 can be suppressed, and the reliability of the mechanical breaking unit 10 can be improved.

Further, at least a part of the hermetically sealed containers 20, 40 of the pair of single-piece breaking units 14 arranged on the mechanical breaking unit supporting plate 33 is arranged outside the mechanical breaking unit supporting plate 33 in the horizontal direction. The mechanical blocking section support plate 33 is made of a metal material. The movable contacts 18 and 38 of the mechanical contact portions 16 and 36, the operating mechanisms 27 and 47, and the mechanical blocking portion support plate 33 are provided at the same potential.
According to this configuration, while the operating mechanisms 27, 47 are brought close to the mechanical blocking part support plate 33, the parts (first flanges 22, 42) of the fixed contacts 17, 37 in the closed containers 20, 40 are mechanically blocked. It can be moved away from the part support plate 33. Therefore, as compared with the case where the entire hermetically sealed containers 20, 40 are arranged in the horizontal direction so as to overlap with the mechanical blocking unit support plate 33, a portion of the hermetically sealed containers 20, 40 having the same potential as the fixed contacts 17, 37. It is possible to bring the single breaking unit 14 and the mechanical breaking unit supporting plate 33 closer to each other in the vertical direction while insulating the mechanical breaking unit supporting plate 33 from each other. Therefore, it is possible to prevent the mechanical blocking unit 2 from increasing in size in the vertical direction, and to suppress the bending moment generated in the insulating support column 12 that supports the mechanical blocking unit 10.

Further, since the plurality of mechanical interruption units 10 are stacked in a plurality of stages on the insulating support columns 12, the installation area of the DC circuit breaker 1 can be reduced as compared with the case where the mechanical interruption units are arranged side by side. .. It should be noted that the same effect can be obtained in that the plurality of semiconductor blocking units 60 are stacked on the insulating support column 62 in a plurality of stages. Further, the same effect can be obtained in that the commutation device 4 is stacked on the upper part of the semiconductor blocking unit 3.

Further, in each of the plurality of mechanical shutoff units 10, at least a part of the sealed containers 20 and 40 of each of the pair of single shutoff units 14 is arranged outside the mechanical shutoff unit support plate 33 in the horizontal direction.
According to this configuration, the machine breaking unit 2 stacks the machine breaking units 10 in a plurality of stages in the vertical direction, and connects the first flanges 22, 42 of the airtight containers 20, 40 adjacent in the vertical direction with the inter-unit bus bar 52. Only by doing so, all the single breaking units 14 are connected in series with each other, so that it is possible to easily increase the voltage.
Further, according to the configuration of the present embodiment, the bus bar 52 can also be installed with a sufficient insulation distance from the mechanical blocking unit support plate 33.

In addition, the operating mechanisms 27 and 47 of the pair of single body breaking portions 14 arranged on the mechanical breaking portion supporting plate 33 are arranged so as to face and contact each other. Therefore, the impact force and the recoil generated in the operation mechanisms 27 and 47 when the operation rods 26 and 46 are operated can be more effectively offset.

Further, both of the pair of single unit breaking parts 14 arranged on the mechanical breaking part supporting plate 33 constitute only one of the high withstand voltage contact 14A and the current breaking contact 14B. Therefore, the impact force and the recoil generated in the operation mechanisms 27 and 47 when the operation rods 26 and 46 are operated in the pair of single-body blocking portions 14 can be made equal to each other. This makes it possible to more effectively cancel the impact force and the recoil.

Further, the operating mechanisms 27 and 47 are arranged outside the closed containers 20 and 40. Therefore, the maintainability of the operation mechanisms 27 and 47 can be improved as compared with the case where the operation mechanism is arranged inside the closed container.

In addition, in the said 1st Embodiment, although the mechanical contact part 16 of the single interruption|blocking part 14 which comprises 14 A of high withstand voltage contacts is a gas contact, it is not restricted to this. For example, as shown in FIG. 13, the mechanical contact portion 36 of the single breaking portion 14 that constitutes the high withstand voltage contact 14A is a vacuum valve having a withstand voltage performance equivalent to that of the mechanical contact portion 16 in the first embodiment. It may be.

Further, in the first embodiment described above, the mechanical breaking unit 2 is provided with a pair of current breaking contacts 14B, but the present invention is not limited to this. At least one current interruption contact 14B may be provided in the mechanical interruption unit 2. As an example of the configuration in which one current breaking contact 14B is provided in the mechanical breaking unit, the uppermost mechanical breaking unit 10 may include both the high withstand voltage contact 14A and the current breaking contact 14B. Even in this case, in the pair of single cutoff portions 14, the operation rods 26 and 46 operate on the same straight line by the operation mechanisms 27 and 47, and the operation rods 26 and 46 operate by the operation mechanisms 27 and 47. It is desirable that they are arranged in opposite directions. As a result, as described above, the vibration of the mechanical blocking unit can be suppressed, and the insulating pillar 12 can be prevented from becoming excessively large, the support structure can be increased, and the weight accompanying the increase can be suppressed.

Further, in the first embodiment described above, the mechanical interruption unit 2 is provided with six high withstand voltage contacts 14A, but the present invention is not limited to this. It suffices that at least one high withstand voltage contact 14A is provided in the mechanical interruption unit 2.

(Second embodiment)
FIG. 14: is a front view which shows the machine interruption part of 2nd Embodiment typically. Note that, in FIG. 14, the power supply unit 30 and the control unit 31 (see FIGS. 1 and 3) of each machine interruption unit 10 are omitted.
In the second embodiment shown in FIG. 14, the current breaking contact 14B is arranged such that the operating direction of the operating rod 46 by the operating mechanism 47 is along the extending direction of the insulating support column 12 (that is, the vertical direction). This is different from the first embodiment.

As shown in FIG. 14, the uppermost mechanical breaking unit 10 includes one current breaking contact 14B, a power supply unit and a control unit (not shown), a current breaking contact 14B (single breaking unit 14), a power supply unit and a control unit. And a mechanical block supporting plate 33 fixedly arranged. The current interruption contact 14B is vertically installed. That is, the current interruption contact 14B is arranged such that the above-mentioned second direction is along the vertical direction. The operation rod 46 is arranged so as to extend along the vertical direction. The operation mechanism 47 is located between the closed container 40 and the mechanical blocking unit support plate 33, and is fixed to the mechanical blocking unit support plate 33.

According to this configuration, since the operating direction of the operating rod 46 is along the extending direction of the insulating column 12, the insulating column 12 is affected by the impact force and the recoil generated in the operating mechanism 47 when the current breaking contact 14B is opened. Generation of bending moment can be suppressed. 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 12, an increase in the support structure, and an increase in the weight associated therewith.

In addition, in the second embodiment shown in FIG. 14, the mechanical shutoff units 10 are stacked in two stages, but the invention is not limited to this and may be stacked in three or more stages.
Further, in the second embodiment described above, the configuration in which the current interruption contact 14B is vertically arranged has been described, but the present invention is not limited to this, and the high withstand voltage contact 14A may be vertically arranged.

(Third Embodiment)
FIG. 15: is a front view which shows the machine interruption part of 3rd Embodiment typically. Note that, in FIG. 15, the power supply unit 30 and the control unit 31 (both see FIGS. 1 and 3) of the mechanical shutoff unit 110 are not shown.
As shown in FIG. 15, the third embodiment differs from the above-described embodiments in that the pair of single-piece breaking units 14 are directly supported by the insulating columns 12.

As shown in FIG. 15, the mechanical interruption unit 110 includes a pair of single interruption units 14, a power source unit and a control unit (not shown), and a connecting member 53 that connects the high withstand voltage contact 14A and the current interruption contact 14B. I have it. The first single body breaking portion 14 constitutes a high withstand voltage contact 14A. The second single body breaking portion 14 constitutes a current breaking contact 14B. The high withstand voltage contact 14A and the current interruption contact 14B are vertically placed on the insulating support column 12, respectively. The high withstand voltage contact 14A is fixedly arranged on the insulating support column 12 so that the above-mentioned first direction is along the vertical direction. The operation rod 26 is arranged so as to extend along the vertical direction. The operating mechanism 27 is located between the closed container 20 and the upper end of the insulating support column 12, and is fixed to the insulating support column 12. Further, the current interruption contact 14B is fixedly arranged on the insulating support column 12 so that the above-mentioned second direction is along the vertical direction. The operation rod 46 is arranged so as to extend along the vertical direction. The operation mechanism 47 is located between the closed container 40 and the upper end of the insulating support column 12, and is fixed to the insulating support column 12.

The connecting member 53 is formed of a conductive metal material or the like. The connecting member 53 is arranged between the high withstand voltage contact 14A and the current interruption contact 14B. The connecting member 53 mechanically and electrically connects the second flange 23 of the single breaking unit 14 constituting the high withstand voltage contact 14A and the second flange 43 of the single breaking unit 14 constituting the current breaking contact 14B. doing. As a result, the pair of single body breaking portions 14 are electrically connected in series and mechanically fixed to each other.

According to this configuration, since the single breaking unit 14 is directly supported by the insulating support column 12, the structure of the mechanical breaking unit having the mechanical breaking unit 110 can be simplified.
Moreover, in the single breaking unit 14, since the operating direction of the operating rod 46 is along the extending direction of the insulating column 12, the operation is performed during the opening operation of the single breaking unit 14 as in the second embodiment described above. It is possible to suppress the generation of a bending moment in the insulating column 12 due to the impact force and the reaction generated in the mechanisms 27 and 47. Therefore, it is possible to suppress the vibration of the mechanical blocking unit having the mechanical blocking unit 110, and it is possible to suppress the excessive increase in the size of the insulating column 12, the increase in the supporting structure, and the increase in the weight associated therewith.
Furthermore, since the pair of single body breaking portions 14 are mechanically fixed to each other by the connecting member 53, the vibration of the mechanical breaking portion having the mechanical breaking unit 110 can be more reliably suppressed.

In addition, in the said 3rd Embodiment, although the pair of single-piece|unit interruption|blocking part 14 directly supported by the insulating support|pillar 12 constituted the high withstand voltage contact 14A and the current interruption contact 14B as an example, and demonstrated it. , But not limited to this. Both the pair of single-piece breaking units 14 directly supported by the insulating columns 12 may form the high withstand voltage contact 14A, or both the pair of single-piece breaking units 14 may form the current breaking contact 14B. Good.

(Fourth Embodiment)
FIG. 16: is a front view which shows the machine interruption part of 4th Embodiment typically. Note that, in FIG. 16, the power supply unit 30 and the control unit 31 (see FIGS. 1 and 3) of the mechanical shutoff unit 10 are omitted.
The fourth embodiment shown in FIG. 16 differs from the above-described embodiments in that the insulating support column 12 includes a damper member 54 that absorbs vibration.

As shown in FIG. 16, the damper member 54 supports the mechanical blocking unit supporting plates 33 of the mechanical blocking units 10 adjacent to each other in the vertical direction in the insulating column 12, and the mechanical blocking unit support of the lowermost mechanical blocking unit 10. It is provided between the plate 33 and the foundation 5. Specifically, the damper member 54 is arranged at each of the connection portion of the insulating support column 12 with the foundation 5 and the connection portion with the upper surface of each machine blocking portion support plate 33. The damper member 54 absorbs the vibration transmitted through the insulating support column 12. The damper member 54 is, for example, an air damper (air spring) in which a bellows-shaped rubber member containing air is sandwiched between metal plates, a vibration-proof rubber, or the like.

According to this configuration, the vibration generated in the mechanical shutoff unit 10 is absorbed by the damper member 54. Therefore, it is possible to suppress the vibration generated in the mechanical interruption unit 10 from being transmitted to the other mechanical interruption units 10 through the insulating support column 12. Further, since the damper member 54 can absorb the force in the bending direction of the insulating support column 12, it is possible to suppress the generation of a bending moment in the insulating support column 12. 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 12, an increase in the support structure, and an increase in the weight associated therewith.

In addition, in the example shown in FIG. 16, the damper member 54 is arranged at each of the connection portion with the foundation 5 and the connection portion with the upper surface of each machine blocking portion support plate 33 in the insulating column 12, but is not limited to this. Not done. For example, the damper member may be arranged at each of the connecting portions of the insulating support columns 12 that are connected to the lower surfaces of the mechanical blocking portion supporting plates 33.

(Fifth Embodiment)
FIG. 17: is a front view which shows the machine interruption part of 5th Embodiment typically. Note that in FIG. 17, the power supply unit 30 and the control unit 31 (see FIGS. 1 and 3) of the mechanical shutoff unit 10 are omitted.
The fifth embodiment shown in FIG. 17 differs from the above-described embodiments in that the insulating support columns 12 are suspended from the ceiling of the building 6.

As shown in FIG. 17, the DC circuit breaker 1 is installed in the building 6 in consideration of maintainability and the influence of stains. Each of the walls forming the building 6 is provided at a position that maintains an insulation distance with respect to the high voltage portion of the DC circuit breaker 1.

The insulating columns 12 are suspended from the ceiling of the building 6. The insulating column 12 has a joint 56 and supports the mechanical shutoff unit 10 so as to be swingable with respect to the building 6. The joints 56 are respectively provided at the connecting portions of the insulating support columns 12 with the ceiling of the building 6 and the connecting portions with the upper surface and the lower surface of each machine blocking portion supporting plate 33.

The length of the insulating support column 12 is set so that the machine breaking units 10 adjacent to each other in the vertical direction can be insulated when the current is cut off, and the entire machine breaking unit 10 can be electrically insulated from the ground and the building 6 when energized. Has been done. That is, the length of the portion of the insulating column 12 provided between the uppermost mechanical shutoff unit 10 and the ceiling of the building 6 is such that the entire mechanical shutoff unit 10 is electrically connected to the building 6 when energized. It is set to insulate. Further, the entire length of the insulating support column 12 is set so that the entire mechanical blocking unit 10 can be electrically insulated from the foundation 5 when energized.

According to this configuration, since the insulating support column 12 supports each mechanical blocking unit 10 from above, even if a force in the bending direction of the insulating support column 12 from the mechanical blocking unit 10 acts on the insulating support column 12, the mechanical blocking unit 10 does. The force in the bending direction can be canceled by the gravity of 10. Therefore, it is possible to more reliably suppress the occurrence of a bending moment in the insulating support column 12 as compared with a configuration in which each machine blocking unit 10 is supported from below. 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 12, an increase in the support structure, and an increase in the weight associated therewith.

Moreover, since the insulating column 12 supports the mechanical shutoff unit 10 so as to be swingable with respect to the building 6, the mechanical shutoff unit 10 is swung relative to the building 6 even if the building 6 vibrates due to an earthquake or the like. By doing so, it is possible to reduce the transmission of the vibration of the building 6 to the machine interruption unit 10. 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 12, an increase in the support structure, and an increase in the weight associated therewith.

In addition, in the said 5th Embodiment, although the structure which the insulation support|pillar 12 of the machine interruption|blocking part 2 was hung on the ceiling of the building 6, the insulation support|pillar 62 of the semiconductor interruption|blocking part 3 and the commutation apparatus 4 were further demonstrated. The insulating columns 90 may be suspended on the ceiling of the building 6. As a result, it is possible to achieve the same operational effect as when the insulating support columns 12 of the mechanical blocking unit 2 are suspended on the ceiling of the building 6.

In addition, in each of the above-described embodiments, all the mechanical shutoff units 10 are vertically stacked, but the present invention is not limited to this. For example, the plurality of mechanical shutoff units 10 may be arranged in a horizontal direction while being supported by the insulating columns 12.

Further, in each of the above-described embodiments, the mechanical blocking unit support plate 33, the semiconductor blocking unit support plate 70, and the commutation device support plate 88 are formed separately from each other, but the present invention is not limited to this, and they are not limited to each other. The configuration may be shared. That is, the mechanical blocking unit support plate 33 may be integrated with at least one of the semiconductor blocking unit support plate 70 and the commutation device support plate 88. In this case, since the vibration of the mechanical interruption unit 2 is suppressed as described above, the semiconductor interruption unit 3 and the commutation device 4 are suppressed from vibrating due to the opening operation of the mechanical interruption unit 2.

Further, in each of the above-described embodiments, the mechanical blocking unit 2 is provided in parallel with the semiconductor blocking unit 3 and the commutation device 4, but the invention is not limited to this. For example, the mechanical blocking unit 10 may be stacked on the semiconductor blocking unit 60 by sharing the insulating column 12 of the mechanical blocking unit 2 and the insulating column 62 of the semiconductor blocking unit 3. As a result, the ground area of the DC circuit breaker can be reduced. In this case, since the vibration of the mechanical interruption unit 2 is suppressed as described above, the semiconductor interruption unit 3 and the commutation device 4 are suppressed from vibrating due to the opening operation of the mechanical interruption unit 2.

Further, in each of the above-described embodiments, the entire operation rods 26 and 46 and the support portions 28 and 48 are made of a metal material, but the present invention is not limited to this.
For example, in order to reduce the power supply from the movable contactors 18, 38 to the operating mechanisms 27, 47 through the operating rod and the supporting portion, a part of the operating rod and the supporting portion may be formed of an insulating material or a high resistance material. Good. Even in this case, the potential difference between the movable contacts 18 and 38 and the operating mechanisms 27 and 47 is higher than that in the case where the operating mechanism is electrically insulated from the mechanical contact portion by being grounded to the ground. Is small, the insulating portion can be made small, and the lengthening of the operating rod can be suppressed.

Further, the operating mechanisms 27 and 47 arranged on the same mechanical block supporting plate 33 and the operating mechanisms 27 and 47 and other members may be electrically insulated via an insulating material. In this case, since the energization path from the operating mechanisms 27, 47 to the members other than the movable contacts 18, 38 is eliminated, the energization from the movable contacts 18, 38 to the operating mechanisms 27, 47 can be suppressed. ..

Furthermore, a shield that alleviates the electric field concentration may be appropriately installed in the mechanical blocking unit 2, the semiconductor blocking unit 3, and the commutation device 4 of each of the above embodiments. For example, even if shields are installed at the ends of the single breaking unit 14, which easily cause electric field concentration, and the ends of the mechanical breaking supporting plate 33, the semiconductor breaking supporting plate 70, and the commutation device supporting plate 88. Good. As a result, the distance required for insulating the mechanical breaker 2, the semiconductor breaker 3, and each part of the commutation device 4 can be shortened, and the DC breaker 1 can be prevented from becoming large. Therefore, it is possible to provide a DC circuit breaker that can easily increase the voltage and can suppress the increase in size.

In addition, in the above-described embodiment, the mechanical blocking unit support plate 33 is made of a metal material, but is not limited to this. The mechanical blocking section support plate may be made of an insulating material such as fiber reinforced plastic.

According to at least one embodiment described above, the mechanical interrupting part has a fixed mechanical contact and a movable mechanical contact electrically insulated from the ground, and a mechanical contact and an insulating gas. A sealed container electrically insulated from the ground, an operation rod connected to the movable contact, and an operation mechanism connected to the operation rod and provided at the same potential as the movable contact of the mechanical contact portion. A mechanical shutoff unit having a pair of single shutoff units, and an insulating column supporting the mechanical shutoff unit are provided. The mechanical shutoff unit further includes a mechanical shutoff unit support plate on which a pair of single shutoff units are arranged and which is supported by an insulating support. The pair of single cutoff portions 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 directions, and the respective operating mechanisms face each other. Are arranged as follows. With this configuration, it is possible to provide a DC circuit breaker that can easily increase the voltage, suppress the size increase, and ensure the responsiveness of the breaking operation.

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 (10)

A DC circuit breaker comprising a mechanical circuit breaker, a semiconductor circuit breaker, and a commutation device,
The mechanical cutoff unit,
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,
At least one mechanical shutoff unit having at least one single shutoff part including
Insulating struts supporting said at least one mechanical shutoff unit;
Equipped with
The semiconductor blocking unit,
A semiconductor module including a semiconductor stack in which a plurality of self-excited semiconductor elements are connected in series,
An arrester connected in parallel to the semiconductor module,
Equipped with
The commutation device is
A commutation circuit configured by connecting in parallel a pair of legs and a capacitor in which a pair of self-excited semiconductor elements are connected in series,
A commutation adjusting reactor connected in series to the commutation circuit,
Equipped with
The mechanical breaking unit includes a current breaking contact, and a high withstand voltage contact having high withstand voltage performance or equivalent to that of the current breaking contact,
The at least one mechanical shutoff unit further comprises a mechanical shutoff unit support plate on which the at least one single shutoff unit is disposed and supported by the insulating column.
The at least one single body breaking unit includes a first single body breaking unit and a second single body breaking unit,
The first single body breaking portion constitutes one of the current breaking contact and the high withstand voltage contact,
The second single body breaking portion constitutes one of the current breaking contact and the high withstand voltage contact,
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,
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 disposed outside the mechanical blocking part support plate in the horizontal direction,
The current breaking contact and the high withstand voltage contact 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 commutation circuit and the commutation adjusting reactor are connected in parallel to the current interruption contact,
The commutation circuit is connected to the high withstand voltage contact side of the commutation adjustment reactor,
The semiconductor module is connected in parallel to the high withstand voltage contact and the commutation circuit,
DC circuit breaker. The at least one mechanical shutoff unit includes a plurality of mechanical shutoff units stacked in a plurality of stages in a vertical direction with respect to the insulating column,
In each of the plurality of mechanical shutoff units, the closed container of the first single shutoff unit and the closed container of the second single shutoff unit are connected to each other in series by a busbar in the unit,
The plurality of mechanical interruption units include a first mechanical interruption unit and a second mechanical interruption unit that are vertically adjacent to each other,
A portion of the first mechanical shutoff unit of the first mechanical shutoff unit that is arranged outside the mechanical shutoff unit support plate in the horizontal direction in the closed container; and a portion of the second single shutoff unit of the second mechanical shutoff unit. The portions of the closed container, which are arranged outside the mechanical blocking portion support plate in the horizontal direction, are connected in series to each other by inter-unit bus bars,
The DC circuit breaker according to claim 1. The mechanical blocking unit support plate included in the at least one mechanical blocking unit is formed of a metal material, and is provided at the same potential as the operating mechanism,
The DC circuit breaker according to claim 1 or 2. The operating mechanism of the first single body breaking unit and the operating mechanism of the second single body breaking unit are in contact with each other,
The DC circuit breaker according to any one of claims 1 to 3. Both the first single body breaking portion and the second single body breaking portion constitute one of the high withstand voltage contact and the current breaking contact.
The DC circuit breaker according to any one of claims 1 to 4. The single cutoff portion is arranged such that the operating direction of the operating rod by the operating mechanism is along the extending direction of the insulating column.
The DC circuit breaker according to claim 1. The insulating column includes a damper member that absorbs vibration.
The DC circuit breaker according to any one of claims 1 to 6. The machine shutoff unit is installed in the building,
The insulating pillar is suspended from the ceiling of the building,
The DC circuit breaker according to any one of claims 1 to 7. The semiconductor blocking section includes a semiconductor blocking section support plate in which at least one of the semiconductor module and the arrester is arranged,
The commutation device includes a commutation device support plate in which at least one of the commutation circuit and the commutation adjustment reactor is arranged,
The mechanical block section support plate is integrated with at least one of the semiconductor block section support plate and the commutation device support plate,
The DC circuit breaker according to any one of claims 1 to 8. 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,
At least one mechanical shutoff unit having at least one single shutoff part including
Insulating struts supporting said at least one mechanical shutoff unit;
A current breaking contact, and a high withstand voltage contact having high withstand voltage performance or equivalent to that of the current breaking contact,
Equipped with
The at least one mechanical shutoff unit further comprises a mechanical shutoff unit support plate on which the at least one single shutoff unit is disposed and supported by the insulating column.
The at least one single body breaking unit includes a first single body breaking unit and a second single body breaking unit,
The first single body breaking portion constitutes one of the current breaking contact and the high withstand voltage contact,
The second single body breaking portion constitutes one of the current breaking contact and the high withstand voltage contact,
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,
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 disposed outside the mechanical blocking part support plate in the horizontal direction,
The current breaking contact and the high withstand voltage contact are connected in series to form a mechanical contact module,
Both ends of the mechanical contact module are connected to a DC transmission system,
Mechanical breaker for DC breakers.

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