CN217848779U - Direct current switch device - Google Patents

Abstract

The utility model provides a direct current switchgear includes: an instrument room; the bus chamber is provided with a main bus and a first fixed contact connected with the main bus; the cable chamber is provided with a conductor for connecting to a cable, and a second static contact connected with the conductor is also arranged in the cable chamber or the bus chamber; the conversion current and energy absorption chamber is provided with a third static contact connected with one end of the conversion current branch; the handcart can move in and out of the handcart chamber, a current-carrying branch is arranged on the handcart and comprises a main switch and an auxiliary switch which are connected in series, a first moving contact and a second moving contact which are respectively used for being in contact with a first fixed contact and a second fixed contact, and a third moving contact which is used for being in contact with a third fixed contact are arranged on the handcart, the first moving contact and the second moving contact are respectively connected to two ends of the current-carrying branch, and the third moving contact is connected between the main switch and the auxiliary switch. The utility model provides a direct current switchgear simple structure, handcart light in weight, the later stage of being convenient for is overhauld and is maintained, and is with low costs moreover.

Description

Direct current switch device

Technical Field

The present invention relates to a switching device for a power supply, and more particularly, to a direct current switching device.

Background

With the increasing complexity of the power grid structure, the increasing of the power load and the rapid development of the power distribution technology, the power consumers put higher requirements on the medium voltage switch products. As a novel dc power transmission technology developed in recent decades, the advantage of flexible dc power transmission is more and more prominent, and the flexible dc power transmission also gradually rises as a dc switch device matched with the flexible dc power transmission and is valued by various manufacturers.

However, the dc switching apparatus has more elements than the ac switching apparatus and the structure of the dc switching apparatus is different from that of the ac switching apparatus. To facilitate servicing and maintenance, further improvements in the structure and layout of dc switchgear are needed.

SUMMERY OF THE UTILITY MODEL

In view of the above, an aspect of the present invention provides a dc switch device, which is characterized in that the dc switch device includes: an instrument room arranged with secondary elements for monitoring, protection and measurement; the bus chamber is provided with a main bus and a first fixed contact connected with the main bus; a cable chamber, in which a conductor is arranged for connecting to a cable and in which a second stationary contact connected to the conductor is also arranged; the conversion and energy absorption chamber is provided with a conversion branch and an energy absorption branch, and is also provided with a third static contact connected with the conversion branch; and a handcart room and a handcart, wherein the handcart can move in and out the handcart room, a current-carrying branch circuit is arranged on the handcart, and a first moving contact and a second moving contact which are respectively used for contacting with the first static contact and the second static contact and a third moving contact which is used for contacting with the third static contact are arranged on the handcart, the current-carrying branch circuit comprises a main switch and an auxiliary switch which are connected in series, the first moving contact and the second moving contact are respectively connected to two ends of the current-carrying branch circuit, and the third moving contact is connected to the main switch and between the auxiliary switches.

According to an embodiment of the utility model, it is characterized in that the first stationary contact is arranged in a first insulating box, the second stationary contact is arranged in a second insulating box, the third stationary contact is arranged in a third insulating box, the first moving contact is in contact with the first fixed contact in the first insulating box, the second moving contact is in contact with the second fixed contact in the second insulating box, and the third moving contact is in contact with the third fixed contact in the third insulating box.

According to the embodiment of the utility model, characterized in that, the first insulating box is designed to pass through the baffle between the bus-bar room and the handcart room so that the first moving contact can contact with the first fixed contact; the second insulating box is designed to penetrate through a partition between the bus chamber and the handcart chamber so that the second movable contact can be in contact with the second fixed contact under the condition that the second fixed contact is arranged in the bus chamber; or in the case that the second fixed contact is arranged in the cable chamber, the second insulating box is designed to penetrate through a partition plate between the cable chamber and the handcart chamber so that the second movable contact can be in contact with the second fixed contact.

According to the utility model discloses, its characterized in that the second static contact is arranged under the condition in the generating line room, insulation support has still been arranged to the cable chamber, insulation support is designed to pass the cable chamber with baffle between the generating line room makes the conductor passes insulation support with the second static contact is connected.

According to the embodiment of the present invention, it is characterized in that one end of the main switch is connected to the first moving contact, one end of the auxiliary switch is connected to the second moving contact, and the other end of the main switch and the other end of the auxiliary switch are connected to the third moving contact; the current conversion branch circuit is used for generating an oscillating circuit and manufacturing a current zero crossing point when an open circuit fault occurs, comprises a capacitor, a current conversion switch and a reactor which are connected in series, and is connected with the main switch in parallel; the energy absorption branch is used for absorbing residual energy after the open circuit fault, comprises an energy absorber, and is connected with the commutation branch in parallel.

According to the utility model discloses its characterized in that, cable chamber has still arranged cable lap joint, generating line arrester and/or current transformer.

According to the utility model discloses, its characterized in that, change current switch arranges the condenser with between the reactor, the reactor not with the one end that change current switch connects is connected to the third static contact.

According to the utility model discloses, its characterized in that, the handcart room the generating line room cable chamber and change of current and energy absorption room in arranged independent pressure release passageway respectively.

According to the utility model discloses its characterized in that, the valve has still been arranged to the handcart room, the valve is designed to be in the handcart removes to withdraw from automatic the dropping will during the handcart room first static contact the second static contact with the second static contact is sealed.

According to the embodiment of the utility model provides a, its characterized in that, the cable chamber still arranged with earthing switch that the second static contact is connected and with the mechanically interlocked cabinet door of earthing switch, make the cabinet door only can open under the closed condition of earthing switch.

Because the utility model provides a current-carrying branch road among the direct current switchgear arranges on the handcart for the weight loss of whole handcart makes this direct current switchgear's later stage overhaul and maintenance easier. Because again the utility model provides a change of current branch road and energy absorption branch road in the direct current switchgear all arrange in the change of current that does not need the hand truck to shift out and the energy absorption room, make the utility model provides a direct current switchgear does not need the independent design to carry out the discharge device that discharges to the electric capacity in the branch road that changes current, and then simplified the utility model provides a direct current switchgear's structure, the cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some exemplary embodiments of the invention, and that other drawings can be derived from these drawings by a person skilled in the art without inventive effort.

Fig. 1 is a schematic perspective view of a dc switching apparatus according to an embodiment of the present invention;

fig. 2 is a schematic rear view of a dc switchgear according to an embodiment of the present invention;

fig. 3 is a schematic right side view of a dc switchgear according to an embodiment of the present invention;

fig. 4 is a schematic front view of a dc switchgear according to an embodiment of the present invention; and

fig. 5 is a schematic circuit diagram of a dc switching apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are some, not all embodiments of the invention. Based on the described embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The current direct current switch equipment has a complex structure, the weight of the handcart is heavy, the handcart is not convenient to pull out for later-stage overhaul and maintenance, and the cost is high.

In order to solve the above-mentioned problem that current direct current switchgear exists, the utility model provides a brand-new direct current switchgear. The utility model provides a direct current switchgear only arranges the current-carrying branch road on the handcart and all arranges current conversion branch road and energy absorption branch road in the current conversion and the energy absorption room that do not need the handcart to shift out for the weight of whole handcart alleviates and makes this direct current switchgear's later stage overhaul and maintenance easier, and does not need the independent design to carry out the discharge device who discharges to the electric capacity in the current conversion branch road, and then has simplified direct current switchgear's structure, the cost is reduced.

The dc switchgear provided by the present invention will now be described in detail with reference to the accompanying drawings.

In the drawings, the same reference numerals denote constituent elements of the same or similar structures or functions, and a repetitive description thereof will be omitted in the following description.

Fig. 1 is a schematic perspective view showing a direct current switchgear according to an embodiment of the present invention. Fig. 2 to 4 are a schematic rear view, a schematic right side view and a schematic front view of a dc switchgear according to an embodiment of the present invention, respectively.

Referring to fig. 1 to 4, a dc switchgear 100 according to an embodiment of the present invention includes five independent compartments, namely, an instrument room a, a handcart room B, a bus room C, a cable room D, and a commutation and energy absorption room E. The position layout of the direct current switch device 100 in the cabinet can be as shown in fig. 1 to 4, and can also be adaptively adjusted according to the actual application.

A secondary element for monitoring, protection and measurement is arranged in the instrument chamber a. Secondary components include, but are not limited to, relays, electricity meters, voltage meters, power meters, frequency meters, air switches, transfer switches, signal lights, push buttons, and/or micro-computer integrated protection devices, and the like. These secondary components may be used to monitor, protect, and measure primary components in the dc switchgear 100 including, but not limited to, current transformers, voltage transformers, grounding switches, arresters, circuit breakers, contactors, and the like.

A conductor 1 is arranged in the cable chamber D for connection to a cable. When the user uses the dc switching device 100, one end of the cable is connected to the conductor 1 and the other end is connected to the load. As shown in fig. 1, the bottom of the cable chamber D may be arranged with a plurality of holes or openings 4 (3 holes or openings are shown in fig. 1), through one or more of which holes or openings 4 a cable connected to a load is connected to the conductor 1 in the cable chamber D, thereby providing power management for the load.

The bus bar compartment C is arranged with the main bus bar 2. For example, a hole or an opening H through which the main bus bar 2 passes may be disposed on a side wall of the bus bar compartment C. The number of holes or openings H may be two for arranging two main busbars 2, respectively (for simplicity, only one main busbar 2 is shown in fig. 1), one of the two main busbars 2 being for connecting the positive pole and the other for connecting the negative pole. When the user uses the main bus bar 2 connected to the positive pole, the dc switchgear is called a positive pole cabinet, and when the user uses the main bus bar connected to the negative pole, the dc switchgear is called a negative pole cabinet, such an arrangement providing convenience to the user.

A first fixed contact F1 connected with the main bus 2 and a second fixed contact F2 connected with the conductor 1 in the cable chamber D can also be arranged in the bus chamber C. For example, the conductor 1 may be connected to the second stationary contact F2 through the insulating sleeve 3. The insulating sleeve 3 can pass through the partition between the cable compartment D and the bus bar compartment C to ensure the insulating property of the conductor 1 passing through the cable compartment D.

The commutation and energy absorption chamber E is provided with a commutation branch and an energy absorption branch. Such as the commutation branch 9 and the energy absorption branch 10 described below in connection with figure 5. And a third static contact F3 connected with one end of the commutation branch 9 is arranged in the commutation and energy absorption chamber E.

The hand truck 5 in the hand truck compartment B is movable into and out of the hand truck compartment B, and for example, a rail 6 for moving the hand truck 5 may be disposed in the hand truck compartment B. A current-carrying branch, such as current-carrying branch 8 described below in connection with fig. 5, is arranged on the hand truck 5.

The handcart 5 is further provided with a first moving contact M1 and a second moving contact M2, the first moving contact M1 is used for being in contact with the first fixed contact F1, the second moving contact M2 is used for being in contact with the second fixed contact F2, and the first moving contact M1 and the second moving contact M2 are respectively connected to two ends of the current-carrying branch.

The handcart 5 is also provided with a third moving contact M3 used for contacting with a third fixed contact F3.

As an example, the first fixed contact F1, the second fixed contact F2, and the third fixed contact F3 may be designed in the form of a jack, and the first movable contact M1, the second movable contact M2, and the third movable contact M3 may be designed in the form of a plug. As another example, the first, second and third fixed contacts F1, F2 and F3 may be designed in the form of plugs, and the first, second and third movable contacts M1, M2 and M3 may be designed in the form of jacks.

The first fixed contact F1, the second fixed contact F2 and the third fixed contact F3 can be respectively wrapped by a first insulating box X1, a second insulating box X2 and a third insulating box X3, the first insulating box X1 and the second insulating box X2 can be designed to penetrate through a partition plate between a bus chamber C and a handcart chamber B, and the third insulating box X3 can be designed to penetrate through a partition plate between a commutation and energy absorption chamber E and the handcart chamber B, so that the first movable contact M1, the second movable contact M2 and the third movable contact M3 can be respectively contacted with the first fixed contact F1, the second fixed contact F2 and the third fixed contact F3, and meanwhile, the first fixed contact F1 and the second fixed contact F2 are ensured to penetrate through the insulating property of the bus chamber C, and the third fixed contact F3 is ensured to penetrate through the insulating property of the commutation and energy absorption chamber E.

When the handcart 5 moves into the handcart room B along, for example, the guide rail 6 (i.e., when the handcart 5 moves into the handcart room B from the left side to the right side in fig. 1), the first movable contact M1 on the handcart 5 gradually approaches the partition between the bus room C and the handcart room B, the second movable contact M2 on the handcart 5 gradually approaches the partition between the bus room C and the handcart room B, and meanwhile, the third movable contact M3 on the handcart 5 gradually approaches the partition between the commutation and energy absorption room E and the handcart room B until the first movable contact M1 contacts the first fixed contact F1 (e.g., inserts the first fixed contact F1) in the first insulating box X1, the second movable contact M2 contacts the second fixed contact F2 (e.g., inserts the second fixed contact F2) in the second insulating box X2, and the third movable contact M3 contacts the third fixed contact F3 (e.g., inserts the third fixed contact F3) in the third insulating box X3, thereby achieving the entire loop communication.

It should be noted that fig. 1 to 4 show the second stationary contact F2 located in the bus bar compartment C, but as an alternative embodiment, the second stationary contact F2 may also be designed to be located in the cable compartment D. The difference is that in this case, the second insulating box X2 may be designed to pass through the partition between the cable compartment D and the handcart compartment B, so that the second movable contact M2 can be in contact with the second stationary contact F2 wrapped by the second insulating box X2. The second insulating box can ensure the insulating property of the second fixed contact F2 penetrating through the cable chamber D. The position of the second movable contact M2 in the handcart room B can be correspondingly designed to match with the second fixed contact F2. When the handcart 5 moves into the handcart room B along, for example, the guide rail 6 (i.e., when the handcart 5 moves into the handcart room B from the left side to the right side in fig. 1), the first movable contact M1 on the handcart 5 gradually approaches the partition between the bus room C and the handcart room B, the second movable contact M2 on the handcart 5 gradually approaches the partition between the cable room D and the handcart room B, and meanwhile, the third movable contact M3 on the handcart 5 gradually approaches the partition between the commutation and energy absorption room E and the handcart room B until the first movable contact M1 contacts the first fixed contact F1 (e.g., inserts the first fixed contact F1) in the first insulating box X1, the second movable contact M2 contacts the second fixed contact F2 (e.g., inserts the second fixed contact F2) in the second insulating box X2, and the third movable contact M3 contacts the third fixed contact F3 (e.g., inserts the third fixed contact F3) in the third insulating box X3, thereby achieving the entire loop communication.

By the utility model provides a dc switch device 100 that has described above in connection with fig. 1 to 4 can know, because the utility model provides a current-carrying branch road in the dc switch device is arranged on the handcart for the weight loss of whole handcart makes this dc switch device's later stage overhaul and maintenance easier. Because again the utility model provides a change of current branch road and energy absorption branch road in the direct current switchgear all arrange in change of current and the energy absorption room that does not need the handcart to shift out, make the utility model provides a direct current switchgear has improved the life like components such as electric capacity owing to do not need independent design to carry out the discharge device that discharges and the charge-discharge number of times of the electric capacity that has significantly reduced in the change of current branch road, has also simplified the utility model provides a direct current switchgear's structure has the cost reduced.

Fig. 5 is a schematic circuit diagram of a dc switching apparatus according to an embodiment of the present invention.

Referring to fig. 5, the circuit configuration of the dc switching device 100 includes a current carrying branch 8, a commutation branch 9 and an energy absorbing branch 10.

The current carrying branch 8 is used for carrying a current loop when the line normally operates. The current carrying branch 8 may for example comprise a main switch S1 and an auxiliary switch S2 connected in series. The third moving contact M3 is connected between the main switch S1 and the auxiliary switch S2. The main switch S1 is used to quickly break a line fault and the auxiliary switch S2 is used to finally break the entire line. The main switch S1 is connected to the first moving contact M1, and the auxiliary switch S2 is connected to the second moving contact M2. One end of the main switch S1 which is not connected with the first moving contact M1 and one end of the auxiliary switch S2 which is not connected with the second moving contact M2 are both connectedIs connected with the third moving contact M3. The main switch S1 may be, but is not limited to, for example, a sulfur hexafluoride breaker, a vacuum breaker, etc. The current carrying branch 8 may also comprise a repulsive force mechanism for opening the main switch S1, as indicated by reference numeral 11 in fig. 5. The repulsion mechanism 11 may be implemented by various techniques, illustrated in fig. 5 by a coil, a capacitor C ₁ Capacitor charger B ₁ Capacitor charger protection resistor R ₁ The repulsive force mechanism 11 formed with the control unit 15 is merely an example, and the present invention is not limited thereto.

The commutation branch 9 is used to generate a tank circuit and to make current zero-crossings in case of an open line fault. The commutation branch 9 may for example comprise a series connection of capacitors C ₂ A commutation switch 12 and a reactor L, and a commutation branch 9 is connected in parallel with the main switch S1. The commutation switch 12 can be implemented using, for example, a thyristor SCR, but the invention is not limited thereto. The commutation branch 9 also has a capacitor charger B ₂ And capacitor charger protection resistor R ₂ . As shown in fig. 5, the commutation switch 12 may be disposed at the capacitor C ₂ And a reactor L, wherein one end of the inductor L, which is not connected with the commutation switch 12, is connected to a third fixed contact F3.

The energy absorption branch 10 is used to absorb the remaining energy after the open line fault. The energy absorbing branch 10 may for example comprise an energy absorber 13, and the energy absorber 13 is connected in parallel with the commutation branch 9. As shown in fig. 5, the energy absorber 13 is connected with the commutation switch 12 and the capacitor C ₂ Parallel connection is also possible. The energy absorber may be implemented using, for example, lightning arresters, piezoresistors, and the like.

With reference to fig. 1 to 5, when the dc switchgear 100 is in use, a user can enter a cable chamber D from the bottom of the cable chamber D to connect with the conductor 1, and the other end of the cable is connected with a load. The handcart 5 moves into the handcart chamber B along a guide rail 6, for example, the first moving contact M1, the second moving contact M2 and the third moving contact M3 are respectively contacted with the first fixed contact F1, the second fixed contact F2 and the third fixed contact F3, the main switch S1 and the auxiliary switch S2 are closed, and a conduction circuit is formed by the main bus 2, the first fixed contact F1, the first moving contact M1, the main switch S1, the auxiliary switch S2, the second moving contact M2, the second fixed contact F2, the third moving contact M3, the third fixed contact F3, the conductor 1 and a load.

With reference to fig. 1 to 5, when a line fault occurs, the main switch S1 is first opened and an arc is formed between its electrodes, and when the electrodes reach a certain separation, the commutation switch 12 is closed, and the capacitor C is closed ₂ An oscillating circuit is formed with the current-carrying branch 8 by the reactor L, an oscillating current is generated in the opposite direction to the current in the current-carrying branch 8, so that the arc in the main switch S1 is extinguished at its current due to a forced zero crossing, whereby the line fault is disconnected. After that, the current is transferred to the commutation branch 9, the capacitor C ₂ Is reversely charged when the capacitor C ₂ When the voltage exceeds the operating voltage of the energy absorber 13, the current is gradually transferred to the energy absorption branch 10 until the current of the energy absorber crosses zero, and then the auxiliary switch S2 is opened to complete the disconnection of the whole circuit structure.

In one embodiment, cable joints, bus bar arresters, and/or current transformers are also arranged in the cable compartment D. The cable splice provides a connection between the cable and the conductor 1 for the user. The current transformer is used for collecting the current value in the line. Bus bar arresters are used to rapidly release overvoltage in the event of high voltage intrusion to protect electrical equipment connected to the bus bar from high transient overvoltage.

In one embodiment, an earthing switch 7 connected to the second stationary contact F2 is also arranged in the cable compartment D and a cabinet door with a mechanical interlock with the earthing switch 7 is provided, and the cabinet door can be designed to be opened only when the earthing switch 7 is closed. By this arrangement, it can be ensured that the cable connected to the conductor 1 is already grounded when the cabinet door of the cable chamber D is opened by the service and maintenance personnel, thereby avoiding an electric shock accident.

In one embodiment, independent pressure relief channels are also arranged in the handcart room B, the bus room C, the cable room D and the commutation and energy absorption room E respectively. The pressure relief channel may be implemented in various ways. For example, taking the bus bar compartment C as an example, it is possible to arrange an opening, for example, rectangular, as a pressure relief port at a ceiling thereof, arrange a pressure relief cover above the pressure relief port, and arrange a connecting member between the pressure relief port and the pressure relief cover. The connecting member is designed to be fixed to the top plate at all times during the pressure relief process. When arcing occurs inside the dc switchgear 100 or high-temperature and high-pressure gas occurs, the generated energy impacts the pressure relief cover to open the pressure relief cover, thereby discharging the arcing energy or high-temperature and high-pressure gas outside the dc switchgear 100. Slits, for example, may also be provided in the pressure relief cover to reduce the strength of the pressure relief cover so that it can be easily flushed away.

In one embodiment, the handcart room B is further arranged with a shutter (not shown in the figure) designed to automatically fall to close the first, second and third stationary contacts F1, F2, F3 when the handcart 5 moves out of the handcart room B. Through the arrangement, the first fixed contact F1, the second fixed contact F2 and the third fixed contact F3 which are possibly electrified can be prevented from being touched by a maintainer by mistake.

In one embodiment, the dc switching apparatus 100 may further include a live display device, as indicated by reference numeral 14 in fig. 5, which may be provided, for example, on a cabinet door of the cable compartment D, a panel of the instrument compartment a, or the like. The charged display device 14 may include, for example, a charged sensor and a display unit. The electrified sensor is used for detecting whether the line cable is electrified or not, and the display unit is used for displaying the detection result of the electrified sensor and displaying an electrified warning when the line cable is electrified.

The above description is according to the utility model discloses direct current switchgear 100, it is through only installing the current-carrying branch road on the handcart and all arrange the change of current branch road and energy absorption branch road in the change of current that does not need to move out along with the handcart and energy absorption indoor, has simplified direct current switchgear 100's cabinet body structure and overall arrangement for direct current switchgear 100 does not need the independent design to carry out the discharge device that discharges to the electric capacity in the branch road that changes current, thereby makes the utility model provides a direct current switchgear 100 compares current light and whole current switchgear 100's overall dimension also less, area is also less, and also makes circuit structure's independent test become convenient, has improved direct current switchgear 100's later stage maintenance and convenience and reliability of maintaining.

The block diagrams of circuits, units, devices, apparatuses, devices and systems referred to in the present application are provided as illustrative examples only and are not intended to require or imply that they must be connected, arranged or configured in the manner shown in the block diagrams. As will be appreciated by one skilled in the art, these circuits, units, devices, apparatuses, devices, systems may be connected, arranged, configured in any way as long as the desired purpose is achieved. The circuits, units, devices and apparatuses involved in the present invention can be realized in any suitable manner, for example, by using an application specific integrated circuit (asic), a Field Programmable Gate Array (FPGA), etc., and also by using a general purpose processor in combination with a program.

It should be understood by those skilled in the art that the foregoing specific embodiments are merely exemplary and not limiting, and that various modifications, combinations, sub-combinations and substitutions may be made in the embodiments of the invention depending upon design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A direct current switching apparatus, characterized in that the direct current switching apparatus comprises:

an instrument room arranged with secondary elements for monitoring, protection and measurement;

the bus chamber is provided with a main bus and a first fixed contact connected with the main bus;

a cable chamber in which a conductor is arranged for connection to a cable and in which a second stationary contact connected to the conductor is also arranged;

the current conversion and energy absorption chamber is provided with a current conversion branch and an energy absorption branch, and is also provided with a third static contact connected with one end of the current conversion branch; and

handcart room and handcart, the handcart can remove the business turn over the handcart room, the handcart is last to have arranged the current-carrying branch road to arranged be used for respectively with first moving contact and the second moving contact of first static contact and second static contact and be used for with the third moving contact of third static contact, the current-carrying branch road includes series connection's main switch and auxiliary switch, first moving contact with the second moving contact is connected to respectively the both ends of current-carrying branch road, the third moving contact is connected to the main switch with between the auxiliary switch.

2. The direct current switching device according to claim 1,

the first fixed contact is arranged in a first insulating box, the second fixed contact is arranged in a second insulating box, the third fixed contact is arranged in a third insulating box, the first moving contact is in contact with the first fixed contact in the first insulating box, the second moving contact is in contact with the second fixed contact in the second insulating box, and the third moving contact is in contact with the third fixed contact in the third insulating box.

3. The DC switchgear according to claim 2,

the first insulating box is designed to penetrate through a partition between the bus chamber and the handcart chamber so that the first movable contact can be in contact with the first fixed contact;

the second insulating box is designed to penetrate through a partition between the bus chamber and the handcart chamber so that the second movable contact can be in contact with the second fixed contact under the condition that the second fixed contact is arranged in the bus chamber; or in the case that the second stationary contact is arranged in the cable compartment, the second insulating box is designed to pass through a partition between the cable compartment and the handcart compartment so that the second movable contact can be in contact with the second stationary contact.

4. The direct current switching device according to claim 1,

in the case of the second stationary contact being arranged in the busbar compartment, the cable compartment is also arranged with an insulating sleeve which is designed to pass through a partition between the cable compartment and the busbar compartment, so that the conductor is connected with the second stationary contact through the insulating sleeve.

5. The direct current switching device according to claim 1,

one end of the main switch is connected to the first moving contact, one end of the auxiliary switch is connected to the second moving contact, and the other ends of the main switch and the auxiliary switch are connected with the third moving contact;

the current conversion branch circuit is used for generating an oscillating circuit and manufacturing a current zero crossing point when an open circuit fault occurs, comprises a capacitor, a current conversion switch and a reactor which are connected in series, and is connected with the main switch in parallel;

the energy absorption branch is used for absorbing residual energy after the open circuit fault and comprises an energy absorber, and the energy absorber is connected with the commutation branch in parallel.

6. The direct current switching device according to claim 1,

the cable compartment is further arranged with cable taps, bus arresters, and/or current transformers.

7. The DC switchgear according to claim 5,

the converter switch is arranged between the capacitor and the reactor, and one end of the reactor, which is not connected with the converter switch, is connected to the third fixed contact.

8. The direct current switching device according to claim 1,

independent pressure relief channels are respectively arranged in the handcart chamber, the bus chamber, the cable chamber and the current conversion and energy absorption chamber.

9. The direct current switching device according to claim 1,

the handcart room is further provided with a valve, and the valve is designed to automatically fall down to seal the first fixed contact, the second fixed contact and the second fixed contact when the handcart moves to exit the handcart room.

10. The direct current switching device according to claim 1,

the cable chamber is further provided with a grounding switch connected with the second fixed contact and a cabinet door mechanically interlocked with the grounding switch, so that the cabinet door can be opened only when the grounding switch is closed.

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