CN117526247A - Medium-voltage direct-current switching device - Google Patents
Medium-voltage direct-current switching device Download PDFInfo
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- CN117526247A CN117526247A CN202210903274.6A CN202210903274A CN117526247A CN 117526247 A CN117526247 A CN 117526247A CN 202210903274 A CN202210903274 A CN 202210903274A CN 117526247 A CN117526247 A CN 117526247A
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- 238000002955 isolation Methods 0.000 claims abstract description 28
- 238000012546 transfer Methods 0.000 claims description 47
- 238000009413 insulation Methods 0.000 claims description 6
- 230000007306 turnover Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 16
- 238000005265 energy consumption Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- 230000008878 coupling Effects 0.000 description 13
- 238000010168 coupling process Methods 0.000 description 13
- 238000005859 coupling reaction Methods 0.000 description 13
- 230000003068 static effect Effects 0.000 description 12
- 238000012423 maintenance Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses a medium-voltage direct-current switching-off device. The device comprises: the main branch switch, the main branch moving contact, the auxiliary branch moving contact and the auxiliary branch residual current switching device; the main branch switch is located in a main branch, the main branch moving contacts are respectively arranged on two sides of the main branch, the auxiliary branch moving contacts are respectively arranged on two sides of the auxiliary branch, and auxiliary branch residual current switching-off devices are respectively arranged on two sides of the auxiliary branch. Through being provided with the moving contact respectively at auxiliary branch road and main tributary, the moving contact forms the isolation fracture with the stationary contact that corresponds thereof, realizes assisting branch road and business turn over line and keeps apart completely electrically, conveniently overhauls and guarantees maintainer's safety to with auxiliary branch road residual current break device setting in moving contact one side, then after the moving contact forms the isolation fracture with the stationary contact that corresponds thereof, auxiliary branch road residual current break device can realize electric isolation, guarantees maintainer's security when overhauling auxiliary branch road residual current break device.
Description
Technical Field
The invention relates to the technical field of switching equipment, in particular to a medium-voltage direct-current switching device.
Background
In recent years, urban rail transit and electric automobiles rapidly develop, direct current load is rapidly increased, and along with the continuous acceleration of urban process, the original medium-voltage alternating current distribution network system cannot meet new requirements and is difficult to reform. The characteristics of the medium voltage direct current power distribution system are more in line with the current development situation, and become hot spots of current power grid research, wherein a medium voltage direct current switching device becomes a key for protecting and controlling the medium voltage direct current power distribution system.
In the prior art, a common medium-voltage direct current breaking device is provided with isolation breaks at two ends of a main branch, and residual current breaking devices at two ends of an auxiliary branch. However, the prior art has the following disadvantages: under the condition of no external element, electrical isolation between the auxiliary branch and the main branch and between the auxiliary branch and the inlet and outlet line cannot be realized, and personal safety during maintenance of the auxiliary branch cannot be ensured.
Based on this, the low safety in the overhaul process is a problem to be solved urgently by the person skilled in the art.
Disclosure of Invention
Based on the problems, the invention provides a medium-voltage direct current switching-off device to solve the problem of low safety in the overhaul process.
The embodiment of the invention discloses the following technical scheme:
the embodiment of the invention provides a medium-voltage direct-current breaking device, which comprises:
the main branch switch, the main branch moving contact, the auxiliary branch moving contact and the auxiliary branch residual current switching-off device, wherein the main branch moving contact comprises a first main branch moving contact and a second main branch moving contact, the auxiliary branch moving contact comprises a first auxiliary branch moving contact and a second auxiliary branch moving contact, and the auxiliary branch residual current switching-off device comprises a first auxiliary branch residual current switching-off device and a second auxiliary branch residual current switching-off device;
the main branch switch is positioned on the main branch, the first main branch moving contact is arranged on the first side of the main branch, and the second main branch moving contact is arranged on the second side of the main branch;
the first auxiliary branch moving contact is arranged on the first side of the auxiliary branch, the second auxiliary branch moving contact is arranged on the second side of the auxiliary branch, the first auxiliary branch residual current breaking device is arranged on the first side of the auxiliary branch, and the second auxiliary branch residual current breaking device is arranged on the second side of the auxiliary branch.
Optionally, two ends of the main branch switch are respectively connected with the first main branch moving contact and the second main branch moving contact;
the first auxiliary branch moving contact is connected in series with the first auxiliary branch residual current switching-off device, and the first auxiliary branch residual current switching-off device is connected with one side of the main branch switch, which is provided with the first main branch moving contact;
the second auxiliary branch moving contact is connected with the second auxiliary branch residual current switching-off device in series, and the second auxiliary branch residual current switching-off device is connected with one side of the main branch switch, which is provided with the second main branch moving contact.
Optionally, the main branch switch, the main branch moving contact, the auxiliary branch moving contact and the auxiliary branch residual current breaking device are integrated into one movable mechanical module.
Optionally, the primary branch switch and the secondary branch residual current circuit breaker move with the movable mechanical module when the mechanical module moves.
Optionally, the movable mechanical module is disposed in a first cabinet body of a switch cabinet, the switch cabinet includes the first cabinet body, the switch cabinet further includes a second cabinet body, and the first cabinet body and the second cabinet body are sub-cabinets.
Optionally, the first cabinet body further comprises a main branch instrument room, an upper outlet room and a lower outlet room.
Optionally, the second cabinet body comprises an auxiliary branch instrument room and a transfer branch room, wherein the transfer branch room comprises a transfer branch breaking module and a coupling current converting module.
Optionally, after the main branch moving contact and the auxiliary branch moving contact in the movable mechanical module in the first cabinet body form isolation fractures with the corresponding fixed contacts, the movable mechanical module in the first cabinet body has no voltage and no current, and the second cabinet body has no voltage or no current.
Optionally, the main branch switch is used for receiving a brake-separating command when a short circuit fault occurs and achieving an effective opening and closing distance according to the brake-separating command;
the main branch switch is also configured to open to an effective insulation opening distance after the main branch current is zero and the arc is extinguished.
Optionally, after the main branch is opened to an effective insulation opening distance, the auxiliary branch residual current opening device is used for receiving an opening instruction and opening residual current according to the opening instruction.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the movable contacts are respectively arranged on the main branch and the auxiliary branch, wherein the movable contacts and the fixed contacts corresponding to the movable contacts can form isolation fractures, so that the electric isolation between the auxiliary branch and the main branch and between the auxiliary branch and the inlet and outlet wires can be realized, the personal safety of an maintainer during maintenance of the auxiliary branch is ensured, meanwhile, the auxiliary branch residual current breaking device is arranged on one side of the movable contacts, and after the movable contacts and the fixed contacts corresponding to the movable contacts form isolation fractures, the auxiliary branch residual current breaking device can realize electric isolation, and the safety of the maintainer during maintenance of the auxiliary branch residual current breaking device is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a structural topology diagram of a medium voltage dc switching device according to an embodiment of the present invention;
fig. 2 is a schematic view of a mechanical module of a medium voltage dc breaker according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first cabinet of a medium-voltage dc breaking device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second cabinet of the medium-voltage dc breaking device according to an embodiment of the present invention;
FIG. 5 is a top view of a switchgear cabinet including a first cabinet and a second cabinet according to an embodiment of the invention;
FIG. 6 is a graph showing the current time relationship between the opening control and the action time sequence of a medium voltage DC opening device according to the embodiment of the present invention;
fig. 7 is a current time relation diagram of reclosing (fault elimination) control and action time sequence of a medium voltage dc switching device according to an embodiment of the present invention;
fig. 8 is a current time relation diagram of reclosing (fault is not eliminated) control and action time sequence of a medium voltage dc switching device according to an embodiment of the present invention.
Detailed Description
As described above, the present inventors found in studies directed to vehicle data processing that: under the condition of no external element, electrical isolation between the auxiliary branch and the main branch and between the auxiliary branch and the main branch cannot be realized, and personal safety during maintenance of the auxiliary branch cannot be ensured.
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the above problems, an embodiment of the present invention provides a medium voltage dc breaking device, including: the main branch switch, the main branch moving contact, the auxiliary branch moving contact and the auxiliary branch residual current switching-off device, wherein the main branch moving contact comprises a first main branch moving contact and a second main branch moving contact, the auxiliary branch moving contact comprises a first auxiliary branch moving contact and a second auxiliary branch moving contact, and the auxiliary branch residual current switching-off device comprises a first auxiliary branch residual current switching-off device and a second auxiliary branch residual current switching-off device; the main branch switch is located a main branch, a first main branch moving contact and a second main branch moving contact are respectively arranged on two sides of the main branch, a first auxiliary branch moving contact and a second auxiliary branch moving contact are respectively arranged on two sides of the auxiliary branch, a first auxiliary branch residual current switching-off device is arranged on one side of the auxiliary branch provided with the first auxiliary branch moving contact, and a second auxiliary branch residual current switching-off device is arranged on the other side of the auxiliary branch.
Therefore, the movable contact is arranged on the main branch and the auxiliary branch respectively, wherein the movable contact and the fixed contact corresponding to the movable contact can form an isolation fracture, so that the electric isolation between the auxiliary branch and the main branch and between the auxiliary branch and the inlet and outlet wires can be realized, the personal safety of an maintainer during maintenance of the auxiliary branch is ensured, meanwhile, the auxiliary branch residual current breaking device is arranged on one side of the movable contact, and after the movable contact and the fixed contact corresponding to the movable contact form the isolation fracture, the auxiliary branch residual current breaking device can realize electric isolation, and the safety of the maintainer during maintenance of the auxiliary branch residual current breaking device is ensured.
Fig. 1 is a structural topology diagram of another medium voltage dc switching device according to an embodiment of the present invention, and in combination with the structure topology diagram shown in fig. 1, the medium voltage dc switching device according to the embodiment of the present invention may include:
the main branch switch 1, the main branch moving contact 2, the auxiliary branch moving contact 3, the main branch fixed contact 2', the auxiliary branch fixed contact 3', the auxiliary branch residual current switching device 4, the transfer branch switching module 5, the transfer branch coupling current conversion module 6, the mechanical module 7, the grounding switch 8, the line lightning arrester 9 and the current sensor 10.
Specifically, the main branch moving contact 2 may include a first main branch moving contact 2-1 and a second main branch moving contact 2-2; the auxiliary branch moving contact 3 may include a first auxiliary branch moving contact 3-1 and a second auxiliary branch moving contact 3-2; the auxiliary branch residual current breaking device 4 may include a first auxiliary branch residual current breaking device 4-1 and a second auxiliary branch residual current breaking device 4-2; the transfer branch switching-off module 5 can comprise an IGBT component 5-1, an energy consumption MOV5-2 and a diode 5-3 which form a bidirectional H bridge, wherein the energy consumption MOV5-2 and the diode 5-3 are integrated in the transfer branch switching-off module, and the transfer branch coupling commutation module 6 can comprise a coupling coil 6-1, a discharge capacitor 6-2 and a trigger switch 6-3; the main branch switch 1, the main branch moving contact 2, the auxiliary branch moving contact 3 and the auxiliary branch residual current switching device 4 are integrated into a mechanical module 7; the main branch fixed contact 2' may include a first main branch fixed contact 2' -1 and a second main branch fixed contact 2' -2; the auxiliary branch fixed contact 3' may include a first auxiliary branch fixed contact 3' -1 and a second auxiliary branch fixed contact 3' -2; the ground switch 8 may include a first ground switch 8-1, a second ground switch 8-2, a third ground switch 8-3, and a fourth ground switch 8-4; the line arresters 9 may include a first line arrestor 9-1 and a second line arrestor 9-2; the current sensor 10 may include a first current sensor 10-1 and a second current sensor 10-2.
The isolation fracture refers to the clearance between the contacts in the opening state meeting the voltage-resistant requirement of the isolation switch, namely the distance between the moving contact and the fixed contact in the opening state meeting the voltage-resistant requirement of the isolation switch, so that the electrical isolation can be realized.
Wherein, the dynamic part assembly can comprise a main branch switch 1, a main branch moving contact 2, an auxiliary branch moving contact 3 and an auxiliary branch residual current switching device 4; the static part component may include a main branch static contact 2', an auxiliary branch static contact 3', a transfer branch breaking module 5 and a transfer branch coupling and converting module 6, and the dynamic part component and the static part component include, but are not limited to, the content of the dynamic part component and the static part component are not specifically limited, and all components are not fully completed herein, only the main components are included, and therefore, the protection scope of the present invention is not limited.
Wherein the IGBT component 5-1 represents a component consisting of an insulated gate bipolar transistor, and can statically turn on and off current; the energy-consuming MOV5-2 integrated in the switching-off module represents a metal oxide variable resistor, the function being to absorb energy and consume; the trigger switch 6-3 can be realized by using a thyristor and diode anti-parallel assembly, the thyristor is used as the trigger switch, the controllability is high, the reaction speed is high, and the trigger switch can also be realized by using a trigger ball gap or a vacuum trigger arc extinguishing chamber, including but not limited to the type of the trigger switch, and the trigger switch is not particularly limited; the auxiliary branch residual current breaking device is used for breaking residual current, and the residual current can comprise residual current of an arrester, oscillating current in the current transfer device and the like, including but not limited to the type of the concentrated residual current, and is not particularly limited herein.
Fig. 2 is a schematic view of a mechanical module of a medium voltage dc breaker according to an embodiment of the present invention, in which, in this embodiment, the mechanical module 7 is movable, and can be moved out in the direction of arrow a in fig. 2, and can be moved in the direction of arrow b in fig. 2, as shown in connection with fig. 2. The directions a and b are used as directions in the embodiment, and are not used as directions of moving out or moving in a real scene, and the directions of moving in or moving out the machine module 7 are not particularly limited.
Further, after the mechanical module 7 moves out along the arrow a direction in fig. 2, the first main branch moving contact 2-1, the second main branch moving contact 2-2, the first auxiliary branch moving contact 3-1 and the second auxiliary branch moving contact 3-2 can be separated from their corresponding fixed contacts respectively and form an isolation fracture.
Further, after the mechanical module 7 moves out along the arrow a direction in fig. 2, when the first main branch moving contact 2-1 and the second main branch moving contact 2-2, the first auxiliary branch moving contact 3-1 and the second auxiliary branch moving contact 3-2 can be separated from their corresponding fixed contacts respectively and form an isolation fracture, the mechanical module represents that the mechanical module completely realizes electrical isolation, and the static part component and the incoming and outgoing line also completely realize electrical isolation, and in addition, the mechanical module 7 contains all the dynamic part components and the static part component to realize dynamic and static separation, so that the static part component cannot be interfered by the dynamic part component, and stable operation can be realized.
Further, after the mechanical module 7 is completely removed along the arrow a direction in fig. 2, electrical isolation is completely realized, and the auxiliary branch residual current switching device 4 can be safely overhauled, so that the safety of overhaulers is ensured.
The main branch represents a branch for bearing rated direct current running current under a normal working state and generally consists of a quick mechanical switch; the auxiliary branch represents a branch composed of a transfer branch and an energy consumption branch; the transfer branch circuit represents a branch circuit formed by connecting a power electronic device, a coupling module and a residual current switching device in series, and can bear and switch direct current running current without passing current in a normal working state, and the current under abnormal loop conditions (such as short circuit conditions) can be switched on and off in a specified time; the energy consumption branch circuit represents a branch circuit capable of absorbing excessive energy generated in the process of switching off fault current of the system and is usually integrated in the auxiliary branch circuit; the dynamic part component represents a part component which is mechanically acted or has obvious displacement in space during the normal closing and opening processes of the circuit breaker; a static group of components means a component that does not undergo mechanical action or significant spatial displacement during normal closing and opening of the circuit breaker.
In this embodiment, through setting up the isolation fracture at main branch road and auxiliary branch road respectively for realize electric isolation between auxiliary branch road and main branch road, between auxiliary branch road and the total branch road, can guarantee the personnel's safety when overhauling auxiliary branch road, in addition, with all dynamic portion subassembly integration in a mechanical module, when mechanical module wholly shifts out, can realize sound separation, make static portion subassembly not receive the interference of dynamic portion subassembly vibrations, can steady operation.
Based on the embodiment of the medium voltage dc breaking device, the present invention further provides a first cabinet body and a second cabinet body of the medium voltage dc breaking device, fig. 3 is a schematic structural diagram of the first cabinet body of the medium voltage dc breaking device provided by the embodiment of the present invention, fig. 4 is a schematic structural diagram of the second cabinet body of the medium voltage dc breaking device provided by the embodiment of the present invention, and fig. 5 is a top view of a switch cabinet including the first cabinet body and the second cabinet body provided by the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a first cabinet of a medium voltage dc breaking device according to an embodiment of the present invention, and, with reference to fig. 3, the first cabinet of the medium voltage dc breaking device according to the present invention may include:
a main branch instrument room A1, a machine module room A2, an upper outlet room A3 and a lower outlet room A4.
Wherein the machine module chamber A2 may include a movable machine module 7, and the machine module chamber 7 may be a cart or a switch box, including but not limited to the two cases, which are not specifically limited herein.
Wherein the main branch instrument room A1 may include a data acquisition device and a main branch current sensor, including but not limited to the two components, not specifically limited herein.
Further, the main branch instrument room A1 and the machine module room A2 are disposed on the same side, and the main branch instrument room A1 is disposed above the machine module room A2; the upper outlet chamber A3 and the lower outlet chamber A4 are disposed on the same side, and the upper outlet chamber A3 is disposed above the lower outlet chamber A4.
Fig. 4 is a schematic structural diagram of a second cabinet of a medium voltage dc breaking device according to an embodiment of the present invention, and with reference to fig. 4, the second cabinet of the medium voltage dc breaking device according to the present invention may include:
a sub-branch instrument room B1 and a transfer-branch room B2.
The auxiliary branch instrument room B1 may include a data acquisition device and an auxiliary branch current sensor, including but not limited to the two components, and is not specifically limited herein.
The branch chamber B2 may include a branch breaking module 5 and a coupling and converting module 6, including but not limited to the two cases, and is not specifically limited herein.
Further, the auxiliary branch chamber B1 is disposed above the transfer branch chamber B2, and may be disposed above left or above right or in the middle, without being particularly limited thereto.
Fig. 5 is a top view of a switch cabinet including a first cabinet body and a second cabinet body according to an embodiment of the present invention, and in combination with fig. 5, the switch cabinet of the medium voltage dc switching device according to the present invention may include:
a first cabinet A and a second cabinet B.
The first cabinet a and the second cabinet B are respectively disposed at one side, and the two cabinets are disposed at the left side or the right side, which is not particularly limited.
The first cabinet a and the second cabinet B may be electrically connected by wires, and the specific connection mode is not limited herein.
The switch cabinet structure provided by the embodiment of the invention can realize dynamic and static separation, so that vibration generated by the first cabinet body during working does not influence the second cabinet body, and the stable operation of the second cabinet body is ensured; and after the mechanical module 7 of the mechanical module chamber in the first cabinet body is moved out, electrical isolation can be realized so as to ensure personal safety of an maintainer when overhauling the second cabinet body.
Based on the embodiment of the medium voltage dc cut-off device, the invention further provides a control process and an action time sequence of the medium voltage dc cut-off device, see the current time relation diagrams of fig. 6, 7 and 8.
FIG. 6 is a graph showing the current time relationship between the opening control and the action time sequence of the medium voltage DC switching device according to the present invention; FIG. 7 is a graph showing the current time relationship between reclosing (fault elimination) control and action timing of a medium voltage DC switching device according to the present invention; fig. 8 is a current time relation diagram of reclosing (fault not eliminated) control and action time sequence of the medium voltage direct current switching device provided by the invention.
Wherein, closing the switch refers to the process of switching on and switching on current; the switching-off refers to the process of turning off a switch and breaking current.
Fig. 6 is a current time relation diagram of a switching control and an action time sequence of a medium voltage dc switching device provided by the present invention, referring to fig. 6, a switching process of the medium voltage dc switching device provided by an embodiment of the present invention may specifically include:
when the current is switched on, the states of all parts in the medium-voltage direct-current switching device are respectively as follows: the main branch switch 1 is in a closing state, the IGBT component 5-1 in the transfer branch switching-off module 5 is in a switching-off state, the discharge capacitor 6-2 in the transfer branch coupling converter module 6 is pre-charged with a certain voltage, and the trigger switch 6-3 is in the switching-off state. The voltage range of the certain voltage depends on the relevant parameters of the medium-voltage direct-current switching-off device, and further, the discharging capacitor is pre-charged with certain voltage, and negative voltage is formed and the main shunt current is enabled to cross zero when triggered, so that current transfer and the main shunt switch 1 is switched off.
Setting a short circuit fault at the moment t' of the system, completing detection of relay protection of the system, and sending a switching-off command to the medium-voltage direct-current switching-off device, wherein the medium-voltage direct-current switching-off device is at the moment t 0 After receiving the opening command and the opening operation command (external command), the control and protection system of the medium-voltage direct-current opening device immediately sends an opening command to the transfer branch IGBT component 5-1, and simultaneously sends an opening command to the main branch switch 1, and at t 0 Time delta t after passing 1 To t 1 At the moment, the main branch switch 1 reaches an effective opening/closing distance. The effective opening and closing distance refers to the distance between a moving contact and a fixed contact in a medium-voltage direct-current opening and closing device which meets the recovery voltage. Wherein Δt is 1 Representing t 0 To t 1 Is a time increment of (a).
At t 1 At moment, a control protection system of the medium-voltage direct-current switching device sends a switching-on instruction to a trigger switch 6-3 in a transfer branch coupling converter module 6, an inductance of a primary side of a discharge capacitor 6-2 and a coupling coil 6-1 oscillates, a negative voltage is coupled in the transfer branch through a secondary side of the coupling coil, the switching-on module connected in series with the transfer branch is enabled to conduct voltage drop as a whole, and the voltage drop is lower than vacuum arc voltage of a quick mechanical switch, so that current is forced to be transferred from the main branch to the transfer branch, and the time deltat is elapsed 2 To t 2 At the moment, the current of the main branch is reduced to zero, the quick mechanical switch is in arc quenching, and the current is completely transferred to the transfer branch. Wherein Δt is 2 Representing t 1 To t 2 Is a time increment of (a).
Elapsed time Deltat 3 To t 3 At the moment, the main branch switch 1 is opened continuously to an effective insulation opening distance after arc extinction. The effective insulation distance refers to the maximum distance between a moving contact and a fixed contact in a medium-voltage direct-current switching device which meets the recovery voltage. Wherein,Δt 3 representing t 2 To t 3 Is a time increment of (a).
At t 3 At moment, the control protection system of the medium-voltage direct-current switching device sends a switching-off command to the IGBT component 5-1 in the transfer branch switching-off module, and the time deltat passes 4 To t 4 At the moment the IGBT turns off, the current is completely transferred to item 5-2 energy consuming MOV in the transfer leg breaking module 5, where Δt 4 Representing t 3 To t 4 Is a time increment of (2);
from t 4 Time of day elapsed time Δt 5 To t 5 At the moment, the current of the energy consumption MOV5-2 is attenuated to a preset value, the control protection system sends an opening instruction to the auxiliary branch residual current opening device 4 (comprising the first auxiliary branch residual current opening device 4-1 and the second auxiliary branch residual current opening device 4-2), the auxiliary branch residual current opening device 4 opens the residual current, and the whole opening process is finished. The preset value is determined according to actual conditions, and is not particularly limited herein; Δt (delta t) 5 Representing t 4 To t 5 Is a time increment of (a).
In FIG. 6, I represents current, t represents time, I p Indicating the peak value of the system current when the medium voltage direct current switching device is turned off.
In addition, the technical scheme of the invention meets the requirement of reclosing, and when the reclosing operation is executed, the opening is carried out according to the normal opening step.
In the reclosing process, firstly, the IGBT component 5-1 in the transfer branch switching-off module 5 is switched on, and the transfer branch generates current and then is divided into the following two cases:
(1) Fig. 7 is a current time relation diagram of reclosing (fault elimination) control and action time sequence of the medium voltage dc breaker according to the present invention, and if no fault or the fault has disappeared, the reclosing process may be as follows:
after the current of the transfer branch reaches a stable state, the main branch switch 1 is closed; after the main branch switch 1 is closed in place, current is transferred from the transfer branch to the main branch, and when the current of the transfer branch is reduced to zero, the IGBT component 5-1 in the transfer branch switching-off module 5 is switched off, and at the moment, the system reaches the normal running condition, and reclosing is completed.
Wherein each character in fig. 7 is represented as:
t': short circuit fault occurrence time;
t 0 : the medium-voltage direct-current switching-off device receives a short-circuit fault signal, the main branch switch 1 sends out a repulsive force mechanism action signal (switching off), and the IGBT component 5-1 in the transfer branch switching-off module 5 sends out a conduction signal;
t 1 : the transfer branch coupling commutation module 6 of the medium voltage direct current switching device sends out a trigger conduction signal, so that the trigger switch 6-3 is triggered;
t 2 : the current conversion time of the main branch and the auxiliary branch is completed;
t 3 : the IGBT component 5-1 in the transfer branch switching-off module 5 of the medium-voltage direct-current switching-off device sends off signals;
t 4 : the IGBT component 5-1 and the energy consumption MOV5-2 are converted, and the medium voltage direct current switching-off device cuts off current;
t 5 : the energy consumption MOV5-2 completes the energy consumption, and the auxiliary branch residual current switching-off device 4 sends out a switching-off action signal;
t 6 : the auxiliary branch residual current switching-off device 4 sends a switching-on action signal;
t 7 the medium-voltage direct current switching device transfers the branch IGBT component 5-1 to send out the switching-off signal;
t 8 : after the system judges that the fault is eliminated, the main branch switch 1 sends out a repulsive force mechanism action signal (closing);
t 12 : the main branch switch 1 is switched on and starts to commutate the current from the transfer branch to the main branch;
t 13 : completion t 12 The medium-voltage direct-current switching device is restored to an operation state before the occurrence of a short circuit fault, and current can be normally passed;
t 14 : the IGBT component 5-1 in the transfer branch switching-off module 5 of the medium-voltage direct-current switching-off device sends off signals;
i: representing the current;
t: representing time;
I p : indicating the peak value of the system current when the medium voltage direct current switching device is turned off.
(2) Fig. 8 is a current time relation diagram of control and action time sequence of a medium voltage dc breaker (fault is not eliminated), and if the fault exists in combination with fig. 8, the reclosing process may be:
after the IGBT in the 5-1 part of the transfer branch switching-off module is switched on, the IGBT is directly switched off again, the current is transferred to the energy-consuming MOV5-2 in the 5 part of the transfer branch switching-off module, the energy stored in the system is continuously absorbed by the energy-consuming MOV5-2, the current is gradually reduced to zero, the whole system is switched off, and the reclosing process is completed.
Wherein each character in fig. 8 is represented as:
t': short circuit fault occurrence time;
t 0 : the medium-voltage direct-current switching-off device receives a short-circuit fault signal, the main branch switch 1 sends out a repulsive force mechanism action signal (switching off), and the IGBT component 5-1 in the transfer branch switching-off module 5 sends out a conduction signal;
t 1 : the transfer branch coupling commutation module 6 of the medium voltage direct current switching device sends out a trigger conduction signal, so that the trigger switch 6-3 is triggered;
t 2 : the current conversion time of the main branch and the auxiliary branch is completed;
t 3 : the IGBT component 5-1 in the transfer branch switching-off module 5 of the medium-voltage direct-current switching-off device sends off signals;
t 4 : the IGBT component 5-1 and the energy consumption MOV5-2 are converted, and the medium voltage direct current switching-off device cuts off current;
t 5 : the energy consumption MOV5-2 completes the energy consumption, and the auxiliary branch residual current switching-off device 4 sends out a switching-off action signal;
t 6 : the auxiliary branch residual current switching-off device 4 sends a switching-on action signal;
t 7 IGBT component 5-1 in transfer branch circuit breaking module 5 of the medium voltage direct current breaking device sends out the turn-off signal;
t 8 : judging that the short circuit fault still exists by the system;
t 9 : the IGBT component 5-1 in the transfer branch switching-off module 5 of the medium-voltage direct-current switching-off device sends off signals;
t 10 : the IGBT component 5-1 is converted into the energy-consumption MOV5-2, and the energy-consumption MOV5-2 is cut off by a medium-voltage direct current cut-off device;
t 11 : the energy consumption MOV5-2 completes the energy consumption, and the auxiliary branch residual current switching-off device 4 sends out a switching-off action signal to complete reclosing;
i: representing the current;
t: representing time;
I p the system current peak value of the medium-voltage direct current switching device is represented;
I P2 : and the fault current peak value of the second cut-off system in the reclosing action is represented.
The "first" and "second" in the names of "first", "second" (where present) and the like in the embodiments of the present invention are used for name identification only, and do not represent the first and second in sequence.
The foregoing is only one specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A medium voltage dc breaking device, the device comprising:
the main branch switch, the main branch moving contact, the auxiliary branch moving contact and the auxiliary branch residual current switching-off device, wherein the main branch moving contact comprises a first main branch moving contact and a second main branch moving contact, the auxiliary branch moving contact comprises a first auxiliary branch moving contact and a second auxiliary branch moving contact, and the auxiliary branch residual current switching-off device comprises a first auxiliary branch residual current switching-off device and a second auxiliary branch residual current switching-off device;
the main branch switch is positioned on the main branch, the first main branch moving contact is arranged on the first side of the main branch, and the second main branch moving contact is arranged on the second side of the main branch;
the first auxiliary branch moving contact is arranged on the first side of the auxiliary branch, the second auxiliary branch moving contact is arranged on the second side of the auxiliary branch, the first auxiliary branch residual current breaking device is arranged on the first side of the auxiliary branch, and the second auxiliary branch residual current breaking device is arranged on the second side of the auxiliary branch.
2. The medium voltage direct current breaking device according to claim 1, wherein two ends of the main branch switch are respectively connected with the first main branch moving contact and the second main branch moving contact;
the first auxiliary branch moving contact is connected in series with the first auxiliary branch residual current switching-off device, and the first auxiliary branch residual current switching-off device is connected with one side of the main branch switch, which is provided with the first main branch moving contact;
the second auxiliary branch moving contact is connected with the second auxiliary branch residual current switching-off device in series, and the second auxiliary branch residual current switching-off device is connected with one side of the main branch switch, which is provided with the second main branch moving contact.
3. The medium voltage dc breaking device according to claim 1, wherein the main branch switch, the main branch moving contact, the auxiliary branch moving contact and the auxiliary branch residual current breaking device are integrated in one movable mechanical module.
4. A medium voltage direct current breaking device according to claim 3, characterized in that the main branch switch and the auxiliary branch residual current breaking device move together with the movable mechanical module when the mechanical module moves.
5. A medium voltage direct current breaking device according to claim 3, characterized in that the movable mechanical module is placed in a first cabinet body of a switch cabinet, the switch cabinet comprising the first cabinet body, the switch cabinet further comprising a second cabinet body, the first and second cabinet bodies being separate cabinets.
6. The medium voltage dc breaking device according to claim 5, wherein the first cabinet further comprises a main branch instrument compartment, an upper outlet compartment and a lower outlet compartment.
7. The medium voltage dc breaking device according to claim 5, wherein the second cabinet comprises an auxiliary branch instrument compartment and a transfer branch compartment, wherein the transfer branch compartment comprises a transfer branch breaking module and a coupled commutation module.
8. The medium voltage dc breaking device according to claim 5, wherein the movable mechanical module in the first cabinet is voltage-free and current-free and the second cabinet is voltage-free and current-free after the main branch moving contact and the auxiliary branch moving contact in the movable mechanical module in the first cabinet each form an isolation fracture with their corresponding stationary contacts.
9. Medium voltage direct current breaking device according to any of claims 1-8, characterized in that the main branch switch is adapted to receive a breaking command when a short circuit fault occurs and to reach an effective breaking distance according to the breaking command;
the main branch switch is also configured to open to an effective insulation opening distance after the main branch current is zero and the arc is extinguished.
10. Medium voltage direct current breaking device according to claim 9, characterized in that the secondary branch residual current breaking device is adapted to receive a breaking instruction and to break the residual current according to the breaking instruction after the primary branch has been opened to an effective insulation opening distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210903274.6A CN117526247A (en) | 2022-07-28 | 2022-07-28 | Medium-voltage direct-current switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210903274.6A CN117526247A (en) | 2022-07-28 | 2022-07-28 | Medium-voltage direct-current switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117526247A true CN117526247A (en) | 2024-02-06 |
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ID=89763136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210903274.6A Pending CN117526247A (en) | 2022-07-28 | 2022-07-28 | Medium-voltage direct-current switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117526247A (en) |
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2022
- 2022-07-28 CN CN202210903274.6A patent/CN117526247A/en active Pending
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