Visual grounding load switch device and system and control method thereof

Abstract

The invention relates to the field of rail transit, and discloses a visual grounding load switch device and system and a control method thereof. The connection state between a rear-end contact network and a front-end contact network and between the rear-end contact network and the ground in a rail transit traction power supply system is controlled by arranging a visual grounding load switch device of a disconnecting link combination circuit with an arc extinguishing function; therefore, even under the condition that the pantograph does not descend and is loaded, control over power failure and power transmission of the rear-end contact network can be achieved, and the phenomenon that an isolation knife switch is damaged by second arc discharge generated when the load is loaded is avoided through the knife switch combination circuit with the arc extinguishing function.

Description

Technical Field

[0001] The present application relates to the field of rail transit, and in particular to a visual grounding load switch device, system and control method thereof. Background Art

[0002] With the continuous development of intelligent rail transit technology, visual power supply control of the contact network in the track has become the current development trend.

[0003] like Figure 1 The figure shows the traction power supply system of each track of the current rail transit vehicle depot. The power is sent to the rear contact network through the DC switch cabinet of the substation, the front contact network and the rear contact network. There is an electrical segmentation between the front contact network and the rear contact network. Above the electrical segmentation is the online isolation switch A, and between the contact network and the rail is the grounding switch C. After the vehicle enters the track, it needs to be maintained. First, the contact network needs to be powered off.

[0004] In the existing overhead line power outage, the vehicle pantograph status is first confirmed. After confirming that the pantograph has been lowered, the online isolation knife switch A is opened. After the power is tested and no electricity is found, the grounding knife switch C is closed to complete the overhead line power outage and grounding operation. However, in reality, the supervision of whether the vehicle pantograph is lowered is often not in place, and information transmission relies on manual work. It is often the case that the online isolation knife switch A is directly operated when the vehicle pantograph is not lowered, causing the knife switch contacts to arc and burn. Summary of the invention

[0005] The main purpose of the present application is to solve the problem that arcing may occur and the knife switch contacts may burn out when controlling the on / off and grounding operations of the track contact network under load in the prior art.

[0006] In a first aspect, the present application provides a visual grounding load switch device, which is applied to a rail transit traction power supply system, and the device comprises: a knife switch combination circuit and a controller, wherein the knife switch combination circuit and the controller are communicatively connected, and the knife switch combination circuit is connected in parallel with an electrical segment between a front contact network and a rear contact network;

[0007] The knife switch combination circuit comprises: a DC contactor, a contact knife switch and a three-position knife switch;

[0008] The contactor is connected in series with the incoming line end of the three-station switch and then connected in parallel above the electrical segment, and the DC contactor is connected in parallel with the contactor;

[0009] The controller determines the comprehensive state of the knife switch combination circuit according to the power supply demand in the rail transit traction power supply system, and determines the constraint conditions of the DC contactor, the connecting knife switch and the three-position knife switch based on the comprehensive state, and controls the DC contactor, the connecting knife switch and the three-position knife switch to open or close based on the constraint conditions, so as to realize the control of the power on and off state and the grounding state of the rear-end contact network.

[0010] Optionally, the controller is specifically used for:

[0011] When it is detected that the rail transit traction power supply system meets the first constraint condition, the two connection ends of the three-station knife switch connected to the front-end contact network and the rear-end contact network are closed, the DC contactor is closed, the connecting knife switch is closed, and the DC contactor is opened in sequence to realize the power supply to the rear-end contact network.

[0012] Optionally, the controller is specifically used for:

[0013] When it is detected that the rail transit traction power supply system meets the second constraint condition, the DC contactor is controlled to close, the connecting knife switch is controlled to open, the DC contactor is controlled to open, and the three-position knife switch is controlled to open in sequence to achieve power outage and grounding of the rear-end contact network.

[0014] A second aspect of the present application provides a rail transit traction power supply system, the system comprising:

[0015] At least two sections of overhead line for supplying power to vehicles on the track;

[0016] At least one visual grounding load switch device as described above, which is connected in parallel above the electrical segment between the two sections of the contact network, is used to determine the comprehensive state of the knife switch combination circuit according to the power supply demand of the rail transit traction power supply system for the vehicle, and determine the constraint conditions of the DC contactor, the connecting knife switch and the three-position knife switch based on the comprehensive state, and control the DC contactor, the connecting knife switch and the three-position knife switch to open or close based on the constraint conditions, so as to realize the control of the power on and off state and the grounding state of the rear end contact network.

[0017] A third aspect of the present application provides a control method applied to the rail transit traction power supply system as described above, the method comprising:

[0018] Determining a power supply demand of the vehicle and a constraint condition corresponding to the power supply demand based on the state of the vehicle;

[0019] Based on the constraint conditions, the opening and closing states of the three-position knife switch, the connecting knife switch and the DC contact on the visualized grounding load switch device are controlled to realize the power-on or power-off of the contact network.

[0020] Optionally, the determining the power supply demand of the vehicle based on the state of the vehicle and the constraint condition corresponding to the power supply demand includes:

[0021] If the state of the vehicle is a maintenance state, determining that the power supply requirement is a power outage, and the constraint condition corresponding to the power supply requirement is a first constraint condition;

[0022] If the state of the vehicle is a maintenance completed state, it is determined that the power supply requirement is powered on, and the constraint condition corresponding to the power supply requirement is the second constraint condition.

[0023] Optionally, after determining the power supply demand of the vehicle based on the state of the vehicle and the constraint condition corresponding to the power supply demand, the method further includes:

[0024] Respectively obtaining the actual states of the three-station knife switch, the connecting knife switch and the DC contact;

[0025] Determining whether the actual state is an initial state corresponding to the power supply demand;

[0026] If not, the states of the three-station knife switch, the connecting knife switch and the DC contact are controlled to switch to the initial state respectively.

[0027] Optionally, the controlling the opening and closing states of the three-position knife switch, the connecting knife switch and the DC contact on the visualized grounding load switch device based on the constraint condition includes:

[0028] If the constraint condition is the first constraint condition, the two connection ends of the three-position knife switch on the visual grounding load switch device connected to the front contact network and the rear contact network are controlled to close, the DC contactor is closed, the contact knife switch is closed, and the DC contactor is opened;

[0029] If the constraint condition is the second constraint condition, the DC contactor is controlled to close, the connecting knife switch is controlled to open, the DC contactor is controlled to open, and the two connection ends of the three-station knife switch connected to the rear end contact network and the ground are controlled to close in sequence.

[0030] The fourth aspect of the present application provides a computer device, comprising: a memory and at least one processor, wherein instructions are stored in the memory, and the memory and the at least one processor are interconnected via lines; the at least one processor calls the instructions in the memory so that the computer device executes the above-mentioned control method of the rail transit traction power supply system.

[0031] A fifth aspect of the present application provides a computer-readable storage medium, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer executes the above-mentioned control method for the rail transit traction power supply system.

[0032] In the technical solution of the present application, a visual grounding load switch device composed of a knife switch combination circuit with an arc extinguishing function is provided to control the connection status between the rear-end contact network in the rail transit traction power supply system and the front-end contact network and the ground, thereby achieving power outage and power supply control of the rear-end contact network even when the pantograph is not lowered and is under load. The knife switch combination circuit with an arc extinguishing function avoids the phenomenon of arcing and damaging the isolation knife when under load. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is the existing rail transit traction power supply system diagram;

[0034] Figure 2 A schematic diagram of an embodiment of a visual grounding load switch device provided in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of another embodiment of a visual grounding load switch device provided in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of an embodiment of a rail transit traction power supply system provided in an embodiment of the present application;

[0037] Figure 5 A schematic diagram of a first embodiment of a control method for a rail transit traction power supply system provided in an embodiment of the present application;

[0038] Figure 6 A schematic diagram of a power outage process in a control method for a rail transit traction power supply system provided in an embodiment of the present application;

[0039] Figure 7 The operation sequence of each switch when the rear end contact network is powered off provided in the embodiment of the present application;

[0040] Figure 8 A schematic diagram of a power transmission process in a control method for a rail transit traction power supply system provided in an embodiment of the present application;

[0041] Fig. 9 The operation sequence of each switch when the rear contact network is transmitting power provided in the embodiment of the present application;

[0042] Fig.10 A schematic diagram of an embodiment of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The embodiments of the present application provide a visual grounding load switch device, system and control method thereof. In the technical solution of the present application, a three-position switch is used to replace the online isolation switch B and the grounding switch C in the prior art, and a contactor with arc extinguishing function is combined to realize the control of the contact network power on and off and grounding. In this way, since the contactor can extinguish arcs and operate with load, it is ensured that the online switch will not have arcing when the vehicle is not down, thereby ensuring the safety of the isolation switch and increasing the service life of the isolation switch.

[0044] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] In view of the defects of the prior art, the present application provides a visual grounding load switch device, such as Figure 2 As shown, the device includes at least one knife switch combination circuit 210 and a controller 220, wherein the knife switch combination circuit 210 is a contactor and / or knife switch combination with an arc extinguishing function to form a switch unit, and the controller 220 is communicatively connected with each of the knife switch combination circuits 210; in actual applications, each of the knife switch combination circuits 210 is arranged between two sections of contact networks, and is used to control the connection and disconnection between the previous contact network and the next contact network, so as to realize the control of power supply or power outage.

[0046] The knife switch combination circuit 210 has three connection ends, which are respectively connected to the front contact network, the rear contact network and the ground, and are used to control the connection status between the rear contact network and the front contact network and the ground. The front contact network and the rear contact network here are relative to the parking garage of the vehicle, that is, the vehicle needs to stay in the corresponding maintenance area when it needs to be repaired and maintained. There is a contact network in each maintenance area, and the rear contact network refers to the contact network in the maintenance area. The front and rear contact networks are contact networks outside the maintenance area. Electricity is transmitted from the front contact network to the rear contact network. In the default state, the front contact network and the rear contact can be in a connected state or a disconnected state. In the disconnected state, it is necessary to monitor in real time whether there is a vehicle approaching the maintenance area. If so, it is necessary to connect the connection between the front contact network and the rear contact network, and when the vehicle is completely parked in the detection area, the knife switch combination circuit 210 is controlled to open the gate to achieve power outage of the rear contact network, thereby ensuring that the detection area is not energized and the life safety of the staff is guaranteed.

[0047] As for power supply, the control logic is opposite to that of power outage / power failure. After determining that the vehicle inspection and maintenance is completed, the knife switch combination circuit 210 is controlled to close to realize power supply to the rear-end contact network and provide driving force for the vehicle to leave the detection area.

[0048] In this embodiment, after the visualized grounding load switch device receives the power supply demand sent by the rail transit traction power supply system, the controller 220 controls the knife switch combination circuit 210 to open or close based on the power supply demand to realize the power on / off state and grounding state of the rear-end contact network.

[0049] Specifically, the power supply demand includes power supply and power outage. When there is a power outage, the controller 220 outputs a disconnection control command to the knife switch combination circuit 210. The knife switch combination circuit 210 controls the closing or opening of each knife switch in the knife switch combination circuit 210 based on the disconnection control command, so that the final state of the knife switch combination circuit 210 is the disconnection state, thereby realizing the power outage operation of the rear-end contact network.

[0050] If the power supply demand is for power transmission, the controller 220 outputs a closing control command to the knife switch combination circuit 210, and the knife switch combination circuit 210 controls the closing or opening of each knife switch in the knife switch combination circuit 210 based on the closing control command, so that the final state of the knife switch combination circuit 210 is the closed state, thereby realizing the power transmission operation of the rear-end contact network.

[0051] like Figure 3As shown, the switch combination circuit 210 includes a three-position switch 211, a contact switch 212 and a DC contactor 213; wherein the three-position switch 211 is a three-position isolation grounding switch with three positions, including an on position, an isolation position and a grounding position, the contact switch 212 is a common isolation switch, and the DC contactor 213 is an electrically maintained normally open type, which can usually break a maximum DC power of 2000A. The operation sequence between the three switches needs to be operated in sequence according to the designed logic program to realize the operation of power supply and power outage.

[0052] The contact switch 212 is arranged between the connection end of the three-station switch 211 connected to the front contact network and the front contact network, and the contact switch 212 is connected in parallel with the DC contactor 213;

[0053] The three connection ends of the three-station knife switch 211 are respectively connected to the front contact network, the rear contact network and the ground.

[0054] That is, by adding a DC contactor 213, the on-load opening and closing control is realized. The DC contactor 213 is arranged in parallel with the contact switch 212, and then connected in series with the three-station switch 211, and has an arc extinguishing function. At the same time, the on-grid isolation knife B and the grounding knife C in the traditional traction power supply system are merged into the three-station switch 211. When the vehicle enters the warehouse for maintenance and the contact network needs to be shut down, since the DC contactor 213 is arranged in parallel with the contact switch 212, and the DC contactor 213 can disconnect the DC load, when the vehicle is in the state of not lowering the bow, the contact switch 212 can be directly opened, and then the DC contactor 213 cuts off the DC load, and then a series of operations such as opening the three-station switch 211, testing the electricity, and connecting and closing the switch are performed.

[0055] based on Figure 2 The device structure is such that when the controller 220 controls the opening and closing of the knife switch combination circuit 211, it specifically outputs corresponding control commands for the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213 respectively, and finally controls the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213 to perform opening or closing operations according to a certain control sequence.

[0056] When the controller 220 detects that the rail transit traction power supply system satisfies the first constraint condition, it sequentially controls the two connection ends of the three-station knife switch 211 connected to the front contact network and the rear contact network to close, the DC contactor 213 to close, the connecting knife switch 212 to close, and the DC contactor 213 to open.

[0057] Specifically, the controller 220 polls the rail transit traction power supply system for the vehicle detection results in the maintenance area, that is, the rail transit traction power supply system monitors in real time whether the vehicles in the maintenance area have completed maintenance. If completed, it is determined that the first constraint condition is met, and then an instruction sequence for controlling the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213 is generated. At this time, the instruction sequence includes the closing instruction of the three-station knife switch 211, the closing instruction of the DC contactor 213, the closing instruction of the connecting knife switch 212 and the opening instruction of the DC contactor 213 arranged in order of control time. Among them, the closing instruction of the three-station knife switch 211 refers to the control instruction for closing the two connection ends of the three-station knife switch 211 connected to the front end contact network and the rear end contact network. Finally, based on the instruction sequence, the corresponding control instructions are output in sequence according to the preset time intervals to control the corresponding knife switches to realize power supply control.

[0058] Furthermore, when the controller 220 detects that the rail transit traction power supply system meets the second constraint condition, it sequentially controls the DC contactor 213 to close, the connecting knife switch 212 to open, the DC contactor 213 to open, and the two connection ends of the three-station knife switch 211 connected to the rear end contact network and the ground to close.

[0059] That is, when the controller 220 receives the signal reported by the rail transit traction power supply system that the vehicle has entered the maintenance area, it determines that the second constraint condition is satisfied, and generates an instruction sequence for controlling the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213. The instruction sequence at this time includes the closing instruction of the DC contactor 213, the opening instruction of the connecting knife switch 212, the opening instruction of the DC contactor 213 and the opening instruction of the three-station knife switch 211 arranged in order of control time, wherein the opening instruction of the three-station knife switch 211 refers to the control instruction for closing the two connection ends of the three-station knife switch 211 connected to the rear end contact network and the ground. Finally, based on the instruction sequence, the corresponding control instructions are output in sequence at preset time intervals to control the corresponding knife switches to achieve power outage control.

[0060] Furthermore, the present application also provides a rail transit traction power supply system, such as Figure 4 As shown, the system comprises:

[0061] At least two sections of tracks 410 are used for vehicle parking or driving; wherein, the at least two sections of tracks 410 here should be understood as different sections in a complete rail, and in the present application, a complete rail is divided into multiple tracks 410 according to the function of the section, which includes parking and maintenance functions and operational driving functions, and the parking and maintenance function is mainly the terminal or starting station.

[0062] At least two sections of contact network 420, each end of the track 410 corresponds to a section of contact network 420, which is used to supply power to vehicles on the track; wherein each section of the contact network 420 is mainly divided according to the station as the dividing point, and each station is the connection point of the two sections of the contact network 420, which is specifically achieved through electrical segmentation, and a visual grounding load switch device 430 is connected in parallel above the position of the electrical segmentation.

[0063] At least one visualized ground load switch device 430 as provided in the above embodiment, the visualized ground load switch device 430 is connected in parallel above the electrical segment between the two sections of the contact network 420, and is used to determine the comprehensive state of the knife switch combination circuit according to the power supply demand of the rail transit traction power supply system for the vehicle, and determine the constraints of the DC contactor, the connecting knife switch and the three-position knife switch based on the comprehensive state, and control the DC contactor, the connecting knife switch and the three-position knife switch to open or close based on the constraints, so as to realize the control of the power-on and power-off state and the grounding state of the rear-end contact network. The comprehensive state here should be understood as the power-off or power-on state.

[0064] Figure 4 The figure is a schematic diagram taking two contact networks as an example, contact network 420a and contact network 420b are arranged according to the driving direction of the vehicle from left to right, and an electrical segment 440 is arranged between the contact network 420a and the contact network 420b, and the contact network 420a and the contact network 420b correspond to a track respectively, and the track in the figure is a parking and maintenance area. After the vehicle drives into the track, the power outage is controlled by the visual grounding load switch device 430. Specifically, the DC contactor 213 is controlled to close first, and after the DC contactor 213 is closed, the connecting knife switch 212 is controlled to open, and then the DC contactor 213 is controlled to open, and finally the two connection ends of the three-position knife switch 211 connected to the rear end contact network and the ground are controlled to close, so as to realize the power outage (that is, power outage) of the contact network 420b.

[0065] Furthermore, after the vehicle maintenance is completed, when power needs to be supplied, the two connection ends of the three-station knife switch 211 connected to the front contact network and the rear contact network are controlled to close in sequence, the DC contactor 213 is closed, the connecting knife switch 212 is closed, and the DC contactor 213 is opened.

[0066] In summary, the above-mentioned visual grounding load switch device is used to realize the power supply of rail transit. Due to the automatic arc extinguishing function of the DC contactor in the knife switch combination circuit, the power supply control of the contact network can be operated with load switching, and the switching operation can be directly performed without confirming whether the vehicle has lowered the bow (that is, whether the contact network is loaded). The operating efficiency of the switching operation is improved, and the situation where the isolation knife switch is burned due to arcing is avoided.

[0067] based on Figure 4 Based on the provided rail transit traction power supply system, a control method for controlling the power supply of the rail transit traction power supply system is proposed, such as Figure 5 As shown, the method comprises the following steps:

[0068] 501. Determine a power supply demand of the vehicle and a constraint condition corresponding to the power supply demand based on a state of the vehicle.

[0069] In this embodiment, the positional relationship between the vehicle and the parking and maintenance area on the track is detected, and the power supply demand of the vehicle and the constraints corresponding to the power supply demand are determined based on the positional relationship and the state of the vehicle. Specifically, the positional relationship between the vehicle and the parking and maintenance area on the track is detected by sensors or monitoring equipment installed in the parking and maintenance area. The positional relationship here includes the direction in which the vehicle is moving away from the parking and maintenance area and the direction in which the vehicle is moving toward the parking and maintenance area and entering the track of the parking and maintenance area, wherein the direction in which the vehicle is moving away from the parking and maintenance area can be defined as the completion of vehicle maintenance.

[0070] If the state of the vehicle is a maintenance state, it is determined that the power supply requirement is a power outage, and the constraint condition corresponding to the power supply requirement is the first constraint condition.

[0071] If the state of the vehicle is a maintenance completed state, it is determined that the power supply requirement is powered on, and the constraint condition corresponding to the power supply requirement is the second constraint condition.

[0072] When it is detected that the vehicle is traveling in a direction away from the parking and maintenance area or the vehicle has completed the detection, it is determined that the power supply demand of the vehicle is power supply control, and the constraint condition is the first constraint condition, which can be understood as the closing execution order of the three-station knife switch 211, the contact knife switch 212 and the DC contactor 213;

[0073] If the position relationship is that the vehicle is traveling in the direction approaching the parking and maintenance area and enters the track of the parking and maintenance area, it is determined that the power supply demand of the vehicle is power-off control, and the constraint condition is the second constraint condition. The second constraint condition can be understood as the order of opening the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213.

[0074] In this embodiment, after determining the power supply demand of the vehicle based on the state of the vehicle and the constraint condition corresponding to the power supply demand, the method further includes:

[0075] Respectively obtaining the actual states of the three-station knife switch, the connecting knife switch and the DC contact;

[0076] Determining whether the actual state is an initial state corresponding to the power supply demand;

[0077] If not, the states of the three-station knife switch, the connecting knife switch and the DC contact are controlled to switch to the initial state respectively.

[0078] That is, when the controller receives a power-off operation instruction, it first determines whether the three-station knife switch, the connecting knife switch and the DC contact conform to the power-off logic (i.e., whether they conform to the initial state of the power-off logic control). If they conform, the DC contactor closing signal is turned on. Otherwise, the knife states of the three-station knife switch, the connecting knife switch and the DC contact need to be adjusted to the initial state, and then the power-off control is performed. For the control of power supply, the same reason is not repeated here.

[0079] 502. Based on the constraint conditions, the opening and closing states of the three-position knife switch, the connecting knife switch and the DC contact on the visualized grounding load switch device are controlled to realize the power-on or power-off of the contact network.

[0080] In this embodiment, if the constraint condition is the first constraint condition, the two connection ends of the three-position knife switch on the visual grounding load switch device connected to the front end contact network and the rear end contact network are closed, the DC contactor is closed, the connecting knife switch is closed, and the DC contactor is opened.

[0081] Specifically, when controlling power transmission, the sequential control can be achieved by setting a time interval, such as Fig. 9 As shown, the controller 220 generates a power transmission operation instruction based on the first constraint condition. Based on the power transmission operation instruction, it is first determined whether the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213 meet the power transmission logic (that is, whether the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213 meet the initial state of the knife switch for power transmission). If the conditions are met, the three-station knife switch 211 is disconnected from the connection position to the isolation position. When the controller 220 receives the connection of the three-station knife switch 211, the controller 220 After the on-position closing instruction is given, the on-position closing is carried out to open. After the on-position closing state of the three-position knife switch 211 is collected within 6 seconds, the DC contactor 213 is closed and opened. After the closing state of the DC contactor 213 is collected within 2 seconds, the connecting knife switch 212 is closed and opened. After the connecting knife switch 212 is collected in the closed state within 6 seconds, the DC contactor 213 is opened and opened. After the DC contactor 213 is collected in the open state within 2 seconds, the entire power transmission process is completed.

[0082] In this embodiment, when the vehicle is maintained (i.e., it is determined that power transmission is required), the visual grounding load switch device should process the initial state of power transmission, that is, the contact switch 212 is in the open state, the DC contactor 213 is in the open state, and the three-position switch 211 is in the grounded state. Based on this, the specific process of power transmission is as follows: Figure 8 As shown, the following steps are included:

[0083] Step 1: Control the three-position knife switch to disconnect from the ground wire.

[0084] Specifically, the track and the vehicle are checked to see if they meet the conditions for disconnecting the ground wire. For example, if a signal that the vehicle inspection is completed is received or there is no one there for a long time, it is confirmed that the load ground wire can be removed, and the three-position knife switch 211 is operated from the connection position to the middle isolation position.

[0085] Step 2: Control the three-position knife switch to connect the front contact network and the rear contact network.

[0086] Specifically, by detecting whether the contact switch 212 and the DC contactor 213 are in the open state, if so, it is confirmed that the load contact network meets the power transmission conditions, and the three-position switch is operated from the middle isolation position to the connection position. Since the contact switch 212 and the DC contactor 213 are both in the open state, the rear end contact network (i.e., the contact network 420b in the figure) is still in a power-free state, so the three-position switch 211 can be directly operated from the isolation position to the connection position.

[0087] Step 3: Control the DC contactor to close.

[0088] When it is detected that the three-position knife switch 211 is closed to the on position, the DC contactor 213 is closed. Since the DC contactor 213 has a load-bearing opening and closing function, it can be directly closed.

[0089] Step 4: Control the interconnecting switch to close.

[0090] After detecting that the DC contactor 213 is closed, the connecting knife switch 212 can be closed. Since the connecting knife switch 212 is arranged in parallel with the DC contactor 213, the DC contactor 213 is closed at this time, so the two ends of the connecting knife switch 212 are at the same potential, and the closing of the connecting knife switch 212 will not cause arcing or the like.

[0091] Step 5: Control the DC contactor to open.

[0092] Since the DC contactor 213 used for the track is usually an electrically held contactor and is a normally open contactor. Since the contact switch 212 has been closed at this time, the current carrying capacity of the contact network 420a can flow into the contact network 420b from the contact switch 212. At this time, the power of the coil of the DC contactor 213 can be cut off, so that the DC contactor 213 is reset to the normally open state. At this time, the coil of the DC contactor 213 is in a non-powered state and does not need to be electrically held. The advantage of this design is that since the DC contactor 213 is normally open and does not need to be electrically held, it will not be affected by the secondary power supply of the coil of the DC contactor 213, thereby improving the service life of the DC contactor 213. At the same time, the contact network realizes normal power transmission through the contact switch 212.

[0093] In this embodiment, if the constraint condition is the second constraint condition, the DC contactor is closed, the connecting knife switch is opened, the DC contactor is opened, and the two connection ends of the three-station knife switch connected to the rear end contact network and the ground are closed in sequence.

[0094] Specifically, Figure 7 As shown, the controller 220 generates a power-off operation instruction based on the second constraint condition. Based on the power-off operation instruction, first determine whether the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213 meet the power-off logic (i.e., whether the three-station knife switch 211, the connecting knife switch 212 and the DC contactor 213 meet the initial state of the knife switch of the power outage). If the conditions are met, the DC contactor 213 closing signal is opened. After the DC contactor 213 closing state signal is collected within 2s, the connecting knife switch 212 is opened, and the connecting knife switch 212 is opened. After the controller 220 collects the opening state of the connecting knife switch 212 within 6s, the DC contactor 213 is opened. After the DC contactor 213 opening state signal is collected within 2s, the three-station knife switch 211 can be opened to realize the power-off function. At the same time, the subsequent three-station knife switch 211 grounding operation can be performed.

[0095] In this embodiment, when it is detected that a vehicle enters the vehicle maintenance area (i.e., it is determined that a power outage operation is required), the visual ground load switch device should process the initial state of the power outage, that is, the contact switch 212 is in the closed state, the DC contactor 213 is in the open state, and the three-position switch 211 is in the connected state. Based on this, the specific process of the power transmission is as follows: Figure 6 As shown, the following steps are included:

[0096] Step 1: Control the DC contactor to close.

[0097] The DC contactor 213 has the functions of breaking the DC load and extinguishing the arc, and the two ends of the DC contactor 213 are at the same potential, so the DC contactor 213 can be directly closed.

[0098] Step 2: Control the contact switch to open the circuit breaker.

[0099] Specifically, based on Figure 4 The DC contactor 213 is connected in parallel with the contactor 212, and the DC contactor 213 has been closed. At this time, the two ends of the contactor 212 are at the same potential. When the vehicle has not lowered the bow, the two ends of the contactor 212 are at the same potential. If the contactor 212 is directly opened, there will be no arcing or contact burning.

[0100] Step 3: Control the DC contactor to open.

[0101] When it is determined that the DC contactor 213 and the contactor switch 212 are both in the open state, the DC contactor is directly controlled to open the DC contactor 213 by utilizing the DC load disconnecting function of the DC contactor to realize the DC power cutoff of the contact network.

[0102] Step 4: Open the three-position knife switch from the on position.

[0103] After confirming that the DC contactor 213 and the contact switch 212 have been opened, that is, the rear contact network is disconnected from the front contact network in the incoming power direction, and the contact network has no electricity, the three-position switch 211 can be operated from the connected position to the middle isolation position.

[0104] Step 5: Close the three-position knife switch from the isolation position to the connection position.

[0105] After the contact network is confirmed to be without electricity by retesting the electricity, the three-position knife switch 211 is operated to the grounding position to complete the operation of hanging the ground wire on the contact network.

[0106] In summary, the visualized grounding load switch device has a built-in dedicated three-position isolation grounding knife switch, contact knife switch and DC contactor, and the execution logic of power outage and power supply is configured to prevent misoperation between the three, so that the one-button control of the overhead contact network with load switching operation can be realized. This solves the problem in the prior art that the vehicle's lowered pantograph status must be confirmed before the switching operation can be performed.

[0107] Fig.101 is a schematic diagram of the structure of a computer device provided in an embodiment of the present application. The computer device 1000 may have relatively large differences due to different configurations or performances, and may include one or more processors (central processing units, CPU) 1010 (for example, one or more processors) and a memory 1020, and one or more storage media 1030 (for example, one or more mass storage devices) storing application programs 1033 or data 1032. Among them, the memory 1020 and the storage medium 1030 can be short-term storage or persistent storage. The program stored in the storage medium 1030 may include one or more modules (not shown in the figure), and each module may include a series of instruction operations in the computer device 1000. Furthermore, the processor 1010 can be configured to communicate with the storage medium 1030, and execute a series of instruction operations in the storage medium 1030 on the computer device 1000 to implement the control method of the rail transit traction power supply system provided in the above embodiment.

[0108] The computer device 1000 may also include one or more power supplies 1040, one or more wired or wireless network interfaces 1050, one or more input and output interfaces 1060, and / or one or more operating systems 1031, such as Windows Server, Mac OS X, Unix, Linux, FreeBSD, etc. It will be appreciated by those skilled in the art that Fig.10 The illustrated computer device structure does not constitute a limitation on the computer device, and may include more or fewer components than illustrated, or combine certain components, or arrange the components differently.

[0109] The present application also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium. Instructions are stored in the computer-readable storage medium. When the instructions are executed on a computer, the computer executes the steps of the control method of the rail transit traction power supply system provided in the above embodiment.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device, or unit can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0111] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0112] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A visual grounding load switch device, applied to rail transit traction power supply system, characterized in that: The device comprises: a knife switch combination circuit and a controller, wherein the knife switch combination circuit and the controller are in communication connection, and the knife switch combination circuit is connected in parallel with the electrical segment between the front contact network and the rear contact network; The knife switch combination circuit comprises: a DC contactor, a contact knife switch and a three-position knife switch; The contactor is connected in series with the incoming line end of the three-station switch and then connected in parallel above the electrical segment, and the DC contactor is connected in parallel with the contactor; The controller determines the comprehensive state of the knife switch combination circuit according to the power supply demand in the rail transit traction power supply system, and determines the constraint conditions of the DC contactor, the connecting knife switch and the three-position knife switch based on the comprehensive state, and controls the DC contactor, the connecting knife switch and the three-position knife switch to open or close based on the constraint conditions, so as to realize the control of the power on and off state and the grounding state of the rear-end contact network.

2. The visual grounding load switch device according to claim 1, characterized in that: The controller is specifically used for: When it is detected that the rail transit traction power supply system meets the first constraint condition, the two connection ends of the three-station knife switch connected to the front-end contact network and the rear-end contact network are closed, the DC contactor is closed, the connecting knife switch is closed, and the DC contactor is opened in sequence to realize the power supply to the rear-end contact network.

3. The visual grounding load switch device according to claim 1, characterized in that: The controller is specifically used for: When it is detected that the rail transit traction power supply system meets the second constraint condition, the DC contactor is controlled to close, the connecting knife switch is controlled to open, the DC contactor is controlled to open, and the three-position knife switch is controlled to open in sequence to achieve power outage and grounding of the rear-end contact network.

4. A rail transit traction power supply system, characterized in that: The system comprises: At least two sections of overhead line for supplying power to vehicles on the track; At least one visual grounded load switch device as described in any one of claims 1 to 3, wherein the visual grounded load switch device is connected in parallel above the electrical segment between the two sections of the contact network, and is used to determine the comprehensive state of the knife switch combination circuit according to the power supply demand of the rail transit traction power supply system for the vehicle, and determine the constraints of the DC contactor, the connecting knife switch and the three-position knife switch based on the comprehensive state, and control the DC contactor, the connecting knife switch and the three-position knife switch to open or close based on the constraints, so as to realize the control of the power on and off state and the grounding state of the rear end contact network.

5. A control method for a rail transit traction power supply system as claimed in claim 4, characterized in that: The method comprises: Determining a power supply demand of the vehicle and a constraint condition corresponding to the power supply demand based on the state of the vehicle; Based on the constraint conditions, the opening and closing states of the three-position knife switch, the connecting knife switch and the DC contact on the visualized grounding load switch device are controlled to realize the power-on or power-off of the contact network.

6. The control method of the rail transit traction power supply system according to claim 5, characterized in that: The determining of the power supply demand of the vehicle based on the state of the vehicle and the constraint conditions corresponding to the power supply demand include: If the state of the vehicle is a maintenance state, determining that the power supply requirement is a power outage, and the constraint condition corresponding to the power supply requirement is a first constraint condition; If the state of the vehicle is a maintenance completed state, it is determined that the power supply requirement is powered on, and the constraint condition corresponding to the power supply requirement is the second constraint condition.

7. The control method of the rail transit traction power supply system according to claim 6, characterized in that: After determining the power supply demand of the vehicle based on the state of the vehicle and the constraint condition corresponding to the power supply demand, the method further includes: Respectively obtaining the actual states of the three-station knife switch, the connecting knife switch and the DC contact; Determining whether the actual state is an initial state corresponding to the power supply demand; If not, the states of the three-station knife switch, the connecting knife switch and the DC contact are controlled to switch to the initial state respectively.

8. The control method of the rail transit traction power supply system according to claim 6 or 7, characterized in that: The controlling of the opening and closing states of the three-position knife switch, the connecting knife switch and the DC contact on the visualized grounding load switch device based on the constraint conditions includes: If the constraint condition is the first constraint condition, the two connection ends of the three-position knife switch on the visual grounding load switch device connected to the front contact network and the rear contact network are controlled to close, the DC contactor is closed, the contact knife switch is closed, and the DC contactor is opened; If the constraint condition is the second constraint condition, the DC contactor is controlled to close, the connecting knife switch is controlled to open, the DC contactor is controlled to open, and the two connection ends of the three-station knife switch connected to the rear end contact network and the ground are controlled to close in sequence.

9. A computer device, characterized in that: The computer device comprises: a memory and at least one processor, the memory stores instructions, and the memory and the at least one processor are interconnected via a line; The at least one processor calls the instructions in the memory so that the computer device executes the control method of the rail transit traction power supply system according to any one of claims 5-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the control method of the rail transit traction power supply system as described in any one of claims 5-8 is implemented.

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