CN109228872B - Train power supply system, electric leakage detection positioning device and method thereof, and train - Google Patents
Train power supply system, electric leakage detection positioning device and method thereof, and train Download PDFInfo
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- CN109228872B CN109228872B CN201710558455.9A CN201710558455A CN109228872B CN 109228872 B CN109228872 B CN 109228872B CN 201710558455 A CN201710558455 A CN 201710558455A CN 109228872 B CN109228872 B CN 109228872B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
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- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a train power supply system and a leakage detection positioning device and method thereof, wherein the device comprises: the power supply unit comprises a plurality of leakage protection assemblies, a power supply unit and a control unit, wherein each leakage protection assembly is used for detecting whether the train has high-voltage leakage of a power grid, and if yes, triggering a first switch assembly in a corresponding power receiving unit to be disconnected and outputting a leakage signal; the plurality of controllers are used for controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected; and the vehicle control unit is used for sequentially sending a high-voltage power-on instruction to each controller after all the power receiving units are disconnected from the power grid, so that each controller respectively controls the first switch assemblies correspondingly to enable each power receiving unit to be powered on sequentially.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a leakage detection positioning device of a train power supply system, the train power supply system, a train and a leakage detection positioning method of the train power supply system.
Background
With the development of science and technology, the train provides great convenience for people's trip. At present, a train is mainly powered by a power grid and mainly adopts a direct current main power supply mode. Once a fault occurs at the train end when the power grid supplies power, such as a leakage fault, the power supply condition of the train is directly influenced, and the train can not run.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, a first object of the present invention is to provide a leakage detecting and positioning device for a train power supply system, which can quickly position a power receiving unit with load leakage for directional maintenance.
The second purpose of the invention is to provide a train power supply system.
A third object of the invention is to propose a train.
The fourth purpose of the invention is to provide a leakage detection positioning method for a train power supply system.
In order to achieve the above object, a first embodiment of the present invention provides a leakage detection and location device for a train power supply system, where the train power supply system includes a plurality of power receiving units, a power grid for supplying power to the plurality of power receiving units, each of the plurality of power receiving units includes at least one load, and a first switch assembly for controlling whether the power grid supplies power to the at least one load, and the leakage detection and location device includes: each leakage protection assembly is correspondingly connected between a train body of the corresponding power receiving unit and a high-voltage negative electrode of the power grid, and is used for detecting whether the train has high-voltage power leakage of the power grid or not, and triggering a first switch assembly in the corresponding power receiving unit to be disconnected and outputting a leakage signal when the train has the high-voltage power leakage of the power grid; the controllers are used for controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal; the whole vehicle controller is used for sequentially sending high-voltage power-on instructions to each controller after all power receiving units are disconnected from the power grid, so that each controller respectively controls the first switch assembly correspondingly to enable each power receiving unit to be powered on sequentially, wherein in the process of sequentially powering on each power receiving unit, if the electric leakage protection assembly corresponding to any power receiving unit detects the high-voltage electric leakage of the power grid of the train again, the whole vehicle controller judges that the power receiving unit generates load electric leakage, and positions the power receiving unit generating the load electric leakage.
According to the electric leakage detection positioning device of the train power supply system, when the controllers judge that the at least two first switch assemblies are disconnected according to electric leakage signals output by the electric leakage protection assemblies, all power receiving units are controlled to be disconnected with a power grid, then the whole vehicle controller sends a high-voltage power-on command to each controller in sequence after all the power receiving units are disconnected with the power grid, and in the process that each power receiving unit is powered on in sequence, if the electric leakage protection assembly corresponding to any power receiving unit detects that the train has high-voltage electric leakage, the power receiving unit with the load electric leakage is judged to have the load electric leakage, so that the power receiving unit with the load electric leakage can be positioned quickly, and directional maintenance can be carried out.
In addition, the leakage detecting and positioning device of the train power supply system according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, each first switch assembly comprises: one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid; one end of the first positive contactor is connected with the other end of the first circuit breaker, the other end of the first positive contactor is connected to the positive end of the at least one load, and the negative end of the at least one load is connected to the high-voltage negative pole of the power grid; when detecting that the train has high-voltage electric leakage, each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected so as to disconnect a first switch assembly in a corresponding power receiving unit, and sends an electric leakage signal to a corresponding controller.
According to one embodiment of the invention, each of the plurality of controllers controls all power receiving units to be disconnected from the grid by controlling the first circuit breaker and the first positive contactor in the corresponding power receiving unit to be opened.
According to an embodiment of the present invention, each controller, after receiving the high voltage power-on command, controls the first circuit breaker and the first positive contactor in the corresponding power receiving unit to be closed, so as to power on the corresponding power receiving unit.
According to one embodiment of the invention, each of the earth leakage protection components comprises an overcurrent protection relay or an overvoltage protection relay.
According to an embodiment of the invention, each power receiving unit further comprises a bidirectional DC-DC converter, an on-board battery pack and a second circuit breaker connected between the bidirectional DC-DC converter and the on-board battery pack, wherein when the first switching assembly is open, the on-board battery pack supplies power to the at least one load through the bidirectional DC-DC converter if the second circuit breaker is closed.
According to one embodiment of the invention, when the grid supplies power to the train, the grid also charges the on-board battery pack through the bidirectional DC-DC converter if the second breaker is closed.
In order to achieve the above object, a second aspect of the present invention provides a train power supply system, which includes the above leakage locator of the train power supply system.
According to the train power supply system provided by the embodiment of the invention, the power receiving unit with load electric leakage can be quickly positioned by the electric leakage positioning device, so that directional maintenance can be conveniently carried out.
In order to achieve the above object, a third embodiment of the present invention provides a train, which includes the above leakage current locating device of the train power supply system.
According to the train provided by the embodiment of the invention, the electric leakage positioning device can be used for quickly positioning the power receiving unit with load electric leakage so as to carry out directional maintenance.
In order to achieve the above object, a fourth aspect of the present invention provides a method for detecting and locating electrical leakage of a train power supply system, where the train power supply system includes a plurality of power receiving units and a power grid for supplying power to the plurality of power receiving units, each of the plurality of power receiving units includes at least one load and a first switch assembly for controlling whether the power grid supplies power to the at least one load, and the method includes: detecting whether the train has high-voltage electric leakage of the power grid through each electric leakage protection component connected between the train body of each power receiving unit and the high-voltage negative pole of the power grid; when detecting that the train has high-voltage electric leakage of a power grid, triggering a first switch assembly in a corresponding power receiving unit to be disconnected and outputting an electric leakage signal; controlling all power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal; after all the power receiving units are disconnected with the power grid, sequentially sending a high-voltage power-on instruction to the controller corresponding to each power receiving unit, so that each controller respectively controls the first switch assembly correspondingly to enable each power receiving unit to be powered on sequentially; in the process that each power receiving unit is sequentially electrified, if the electric leakage protection component corresponding to any power receiving unit detects the occurrence of high-voltage electric leakage of the power grid of the train again, the power receiving unit is judged to have load electric leakage so as to position the power receiving unit with the load electric leakage.
According to the electric leakage detection and positioning method of the train power supply system, when the disconnection of at least two first switch assemblies is judged according to electric leakage signals output by the plurality of electric leakage protection assemblies, all power receiving units are controlled to be disconnected with a power grid, then, after all power receiving units are disconnected with the power grid, high-voltage power-on instructions are sent to each controller in sequence, in the process that each power receiving unit is powered on in sequence, if the electric leakage protection assembly corresponding to any power receiving unit detects the high-voltage electric leakage of the power grid of the train again, the power receiving unit with the load electric leakage is judged to generate the load electric leakage, so that the power receiving unit with the load electric leakage is positioned, and the power receiving unit with the load electric leakage can be positioned quickly so as to perform directional maintenance.
In addition, the leakage detection and positioning method for the train power supply system provided by the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, each first switch assembly comprises: one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid; one end of the first positive contactor is connected with the other end of the first circuit breaker, the other end of the first positive contactor is connected to the positive end of the at least one load, and the negative end of the at least one load is connected to the high-voltage negative pole of the power grid; when detecting that the train has high-voltage electric leakage, each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected so as to disconnect a first switch assembly in a corresponding power receiving unit, and sends an electric leakage signal to a corresponding controller.
According to one embodiment of the invention, each controller controls all power receiving units to be disconnected from the grid by controlling the first circuit breaker and the first positive contactor in the corresponding power receiving unit to be opened.
According to an embodiment of the present invention, each controller, after receiving the high voltage power-on command, controls the first circuit breaker and the first positive contactor in the corresponding power receiving unit to be closed, so as to power on the corresponding power receiving unit.
Drawings
Fig. 1 is a schematic structural diagram of a leakage detecting and positioning device of a train power supply system according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a leakage protection device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a leakage protection device according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a leakage detecting and positioning device of a train power supply system according to another embodiment of the invention;
fig. 5 is a flowchart of a leakage detection positioning method of a train power supply system according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a leakage detection positioning device of a train power supply system, a train and a leakage detection positioning method of the train power supply system according to an embodiment of the present invention with reference to the accompanying drawings.
It should be noted that, when the train needs to supply power, the traction substation provides a power grid to supply power to the train, and specifically, the traction substation provides the power grid to a train contact network so as to supply power to the train through the train contact network. For example, the current receiving mode of a straddle monorail train contact system is different from a third rail or overhead contact system mode adopted by traditional wheel rail transportation, and the straddle monorail train contact system is provided with a special negative electrode return contact system (return rail) besides a positive electrode current receiving contact system, and current flows back through a vehicle positive electrode pantograph and then flows back through the return rail. The contact net is positioned in the middle of the side face of the track beam and is completely enveloped by the vehicle body, the contact current receiving face is arranged in a zigzag shape parallel to the central line of the track beam, the contact current receiving face is outward relative to the side face of the track beam, and the pantograph is inward relative to the side face of the track beam and rubs with the contact line of the contact net to receive current.
Fig. 1 is a schematic structural diagram of a leakage detection positioning device of a train power supply system according to an embodiment of the invention.
In an embodiment of the present invention, the train power supply system includes a plurality of power receiving units (e.g., the power receiving unit 110, the power receiving unit 210, and the power receiving unit 310), a power grid for supplying power to the plurality of power receiving units, each power receiving unit in the plurality of power receiving units includes at least one load (e.g., load 1, load 2, load 3), and a first switching component (e.g., the first switching component 111, the first switching component 211, and the first switching component 311) for controlling whether the power grid supplies power to the at least one load.
Specifically, a power receiving unit may be correspondingly disposed on each car of the train, so as to supply power to the load in the car through the power receiving unit, and simultaneously control the power supply to the load in the car through the first switch assembly, for example, when the power receiving unit is controlled by the first switch assembly to be disconnected from the power grid, the power supply to the load in the car is stopped; when the first switch assembly controls the power receiving unit to be connected with the power grid, power supply to the load in the compartment is started.
As shown in fig. 1, the leakage detecting and positioning device of the train power supply system according to the embodiment of the present invention may include: a plurality of earth leakage protection components (such as the earth leakage protection component 120, the earth leakage protection component 220, and the earth leakage protection component 320), a plurality of controllers (such as the controller 130, the controller 230, and the controller 330), and the vehicle control unit 400.
Each of the plurality of earth leakage protection components is disposed corresponding to one power receiving unit, and each of the earth leakage protection components is correspondingly connected between the train body of the corresponding power receiving unit and the high-voltage negative electrode of the power grid, for example, the earth leakage protection component 120 is correspondingly disposed between the train body of the power receiving unit 110 and the high-voltage negative electrode of the power grid, and the earth leakage protection component 220 is correspondingly disposed between the train body of the power receiving unit 210 and the high-voltage negative electrode of the power grid, …. Each electric leakage protection assembly is used for detecting whether the train has electric network high voltage electric leakage or not, and triggering the first switch assembly in the corresponding power receiving unit to be disconnected and outputting an electric leakage signal when the train has electric network high voltage electric leakage. For example, the earth leakage protection component 120 detects whether a train has a high-voltage electric leakage of a power grid in real time, and if so, triggers the first switch component 111 in the corresponding power receiving unit 110 to turn off, and simultaneously outputs an electric leakage signal.
The plurality of controllers are used for controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal. For example, when the controller 130 determines that the first switch component 111 is turned off according to the leakage signal output by the leakage protection component 120, and the controller 230 determines that the first switch component 211 is turned off according to the leakage signal output by the leakage protection component 220, the controller 330 will control the first switch component 311 to be turned off, so as to disconnect the power receiving unit 310 from the power grid.
The vehicle control unit 400 is configured to send a high-voltage power-on instruction to each controller in sequence after all power receiving units are disconnected from the power grid, so that each controller respectively controls the first switch assemblies correspondingly to power on each power receiving unit in sequence, wherein in the process of powering on each power receiving unit in sequence, if the leakage protection assembly corresponding to any power receiving unit detects that the power grid leaks electricity again, the vehicle control unit 400 determines that the power receiving unit leaks electricity when the power receiving unit detects that the power grid leaks electricity again, so as to locate the power receiving unit that has the load leakage electricity.
Specifically, as shown in fig. 1, when the power grid supplies power to each power receiving unit on the train, the leakage protection component corresponding to each power receiving unit detects whether the train has high-voltage leakage, for example, when a high-voltage positive electrode of a train compartment corresponding to the power receiving unit 110 is grounded or reduced in insulation, the corresponding leakage protection component 120 detects that the train has high-voltage leakage, and at this time, the leakage protection component 120 controls the first switch component 111 to be turned off, and simultaneously outputs a leakage signal to the controller 130, and the controller 130 outputs the leakage signal to the vehicle control unit 400. When at least two of the power receiving units in the plurality of power receiving units have power grid high voltage leakage, for example, when the train car corresponding to the power receiving unit 110 and the train car corresponding to the power receiving unit 210 have power grid high voltage leakage, the controller corresponding to the power receiving unit (for example, the power receiving unit 310) which does not have power grid high voltage leakage controls the corresponding first switch component to be turned off, and outputs a turn-off signal to the vehicle controller 400, for example, after the vehicle controller 400 receives the leakage signals of the power receiving unit 110 and the power receiving unit 210, the controller 330 corresponding to the power receiving unit 310 outputs a turn-off signal to the controller 330 corresponding to the power receiving unit 310, and the controller 330 corresponding to the power receiving unit 310 controls the first switch component 311 to be turned off, so that the power receiving unit 310 is turned off from the power grid, and outputs a turn-off.
When the vehicle control unit 400 determines that all the power receiving units on the whole train are disconnected from the power grid, the vehicle control unit 400 sequentially sends a high-voltage power-on command to each controller, so that each controller respectively controls the first switch assembly to sequentially power up each power receiving unit, wherein, in the process of sequentially electrifying each power receiving unit, if the electric leakage protection component corresponding to any power receiving unit detects the occurrence of high-voltage electric leakage of the power grid of the train again, for example, the leakage protection module 120 corresponding to the power receiving unit 110 detects the high voltage leakage of the power grid of the train again, the vehicle control unit 400 determines that the power receiving unit 110 has a load leakage (for example, there is a component leakage on the power output path), so as to locate the power receiving unit 110 having the load leakage, therefore, the positioning of the power receiving unit with load leakage can be quickly realized, so that the directional maintenance can be conveniently carried out.
According to an embodiment of the present invention, as shown in fig. 1, each of the first switch assemblies may include: the device comprises a first circuit breaker HSCB1 and a first positive contactor KM, wherein one end of the first circuit breaker HSCB1 is connected with a high-voltage positive electrode of a power grid; one end of the first positive contactor KM is connected to the other end of the first circuit breaker HSCB1, the other end of the first positive contactor KM is connected to the positive terminal of at least one load, and the negative terminal of the at least one load is connected to the high voltage negative terminal of the grid. When detecting that the train has high-voltage electric leakage of a power grid, each electric leakage protection assembly triggers the corresponding first circuit breaker HSCB1 to be disconnected so as to disconnect the first switch assembly in the corresponding power receiving unit, and sends an electric leakage signal to the corresponding controller.
Specifically, the power receiving unit 110 is taken as an example. When the electric leakage protection component 120 corresponding to the power receiving unit 110 detects that the train has a high-voltage electric leakage, the electric leakage protection component 120 triggers the first circuit breaker HSCB1 in the first switch component 111 to open, so that the power receiving unit 110 is disconnected from the power grid, and simultaneously the electric leakage protection component 120 sends an electric leakage signal to the controller 130, and the controller 130 controls the first positive contactor KM in the first switch component 111 to open through the "KM control" port.
Further, each controller of the plurality of controllers controls all the power receiving units to be disconnected from the grid by controlling the first circuit breaker HSCB1 and the first positive contactor KM in the corresponding power receiving unit to be opened. After each controller receives a high-voltage power-on command, the first circuit breaker HSCB1 and the first positive contactor KM in the corresponding power receiving unit are controlled to be closed, so that the corresponding power receiving unit is powered on.
Specifically, assuming that the leakage protection components corresponding to the power receiving unit 110 and the power receiving unit 210 detect that the train has a high-voltage leakage, and the leakage protection component 320 corresponding to the power receiving unit 310 does not detect that the train has a high-voltage leakage, the controller 330 corresponding to the power receiving unit 310 controls the first positive contactor KM in the first switch component 311 to be turned off through the "KM control" port, and then controls the first circuit breaker HSCB1 in the first switch component 311 to be turned off through the "HSCB control" port, so as to control the power receiving unit 310 to be turned off from the power grid.
When each controller receives a high-voltage power-on command, for example, when the controller 130 corresponding to the power receiving unit 110 receives the high-voltage power-on command, the controller 130 controls the first circuit breaker HSCB1 in the first switch assembly 111 to close through the "HSCB control" port, and then controls the first positive contactor KM in the first switch assembly 111 to close through the "KM control" port, so as to power up the power receiving unit 110.
That is to say, when the earth leakage protection subassembly detected that the train appears the electric wire netting high voltage electric leakage, by the disconnection of earth leakage protection subassembly direct control first circuit breaker HSCB1 to realize the quick disconnection of supply circuit, prevent serious accident and take place, then by the disconnection of corresponding controller control first positive pole contactor KM, wherein, first circuit breaker HSCB1 generally chooses for use high-speed circuit breaker. When the electric leakage protection assembly does not detect that the train has high-voltage electric leakage of a power grid, the corresponding power receiving unit is controlled to be disconnected from the power grid by the corresponding controller, at the moment, the controller firstly controls the first positive contactor KM to be disconnected so as to realize normal power supply stop of a power supply loop, and then controls the first circuit breaker HSCB1 to be disconnected. When the controller receives a high-voltage power-on instruction and starts to supply power to the power receiving unit, whether the electric leakage protection assembly detects that the power grid high-voltage electric leakage occurs to the train before, the first circuit breaker HSCB1 is controlled to be closed firstly, and then the first positive electrode contactor KM is controlled to be closed.
The earth leakage protection component of the present invention is described in detail below with reference to the accompanying drawings.
In an embodiment of the present invention, each of the earth leakage protection components includes an overcurrent protection relay KA or an overvoltage protection relay KV.
According to an embodiment of the present invention, as shown in fig. 2, each leakage protection assembly may include a leakage detection resistor R, a grounding switch QS, a backward diode D, and a leakage detection unit connected in series between the train body and the high voltage negative electrode of the power grid, where the leakage detection unit includes an overvoltage protection relay KV connected in parallel to both ends of the leakage detection resistor R.
The overvoltage protection relay KV includes: a first pin 1 to a seventh pin 7, and a first switch KA 1. The first pin 1 is respectively connected with the positive terminal of the reverse diode D and one end of the leakage detection resistor R; the second pin 2 is connected with the other end of the leakage detection resistor R and the train body respectively; the third pin 3 is connected with the anode of the low-voltage power supply; the fourth pin 4 is connected with the negative electrode of the low-voltage power supply; the first end of the first switch KA1 is used as a fifth pin 5 of the overvoltage protection relay KV, the second end of the first switch KA1 is used as a sixth pin 6 of the overvoltage protection relay KV, the third end of the first switch KA1 is used as a seventh pin 7 of the overvoltage protection relay KV, and the first switch KA1 is connected to a control loop of the first circuit breaker HSCB 1. When the power grid supplies power to the train, if the voltage at two ends of the leakage detection resistor R is greater than the preset voltage, the overvoltage protection relay KV triggers a control loop of the first circuit breaker HSCB1 through the first switch KA1 to control the first circuit breaker HSCB1 to be disconnected.
As an example, the overvoltage protection relay KV may comprise three parts, respectively an overvoltage detection, a relay coil and a controllable switch, wherein the overvoltage detection may be implemented using a voltage transformer and a comparison circuit.
For example, the voltages at the two ends of the leakage detecting resistor R can be obtained by a voltage transformer (the input end of the voltage transformer corresponds to the first pin 1 and the second pin 2 in the figure), and then input to one end of the comparison circuit, and the other end of the comparison circuit is connected to a preset voltage source. When the voltage at the two ends of the leakage detection resistor R is greater than the preset voltage, the comparison circuit outputs a high level signal to control the controllable switch connected in series on the relay coil loop to be closed, and the relay coil is electrified (the power is supplied by the low-voltage power supply anode and the low-voltage cathode corresponding to the third pin 3 and the fourth pin 4). After the coil of the relay is electrified, the first switch KA1 is switched from a closed state (the fifth pin 5 is connected with the seventh pin 7) to an open state (the fifth pin 5 is disconnected with the seventh pin 7, and meanwhile, the fifth pin 5 is connected with the sixth pin 6), so that a control loop of the first circuit breaker HSCB1 is opened, the coil of the first circuit breaker HSCB1 is electrified, and the first circuit breaker HSCB1 is opened. In addition, in order to output the leakage signal to the corresponding controller, the output terminal of the comparator may be used as an eighth pin (not specifically shown in the figure) of the overvoltage protection relay KV to be connected to the leakage signal input terminal of the corresponding controller, and the controller may determine whether leakage occurs according to the signal output by the comparator.
The leakage detection resistor R can be an adjustable resistor, and the preset voltage source can be an adjustable voltage source, so that the leakage protection assembly is suitable for leakage detection of different voltage levels, such as leakage detection of any level between 550V and 1500V, and the universality of the leakage protection assembly is improved.
It is understood that the overvoltage protection relay KV of the present invention can also be implemented in other manners, or directly implemented by using the existing integrated overvoltage protection relay KV, which is not limited herein.
According to another embodiment of the present invention, as shown in fig. 3, each of the earth leakage protection assemblies may include an earth leakage detection resistor R, a ground switch QS, a backward diode D, and an earth leakage detection unit connected in series between the train body and the high voltage negative electrode of the power grid, wherein the earth leakage detection unit includes an overcurrent protection relay KA connected in series between the backward diode D and the earth leakage detection resistor R.
The overcurrent protection relay KA includes: eleventh to seventeenth pins 11 to 17 and a third switch KA 3. The eleventh pin 11 is connected with the positive terminal of the backward diode D; the twelfth pin 12 is connected with the leakage detection resistor R; the thirteenth pin 13 is connected with the positive electrode of the low-voltage power supply; the fourteenth pin 14 is connected with the negative electrode of the low-voltage power supply; a first terminal of the third switch KA3 serves as a fifteenth pin 15 of the overcurrent protection relay KA, a second terminal of the third switch KA3 serves as a sixteenth pin 16 of the overcurrent protection relay KA, a third terminal of the third switch KA3 serves as a seventeenth pin 17 of the overcurrent protection relay KA, and the third switch KA3 is connected to a control loop of the first circuit breaker HSCB 1. When the power grid supplies power to the train, if the current flowing through the leakage detection resistor R is larger than the preset current, the overcurrent protection relay KA triggers a control loop of the first circuit breaker HSCB1 through the third switch KA3 to control the first circuit breaker HSCB1 to be disconnected.
Specifically, the structure and operation of the overcurrent protection relay KA are similar to those of the overvoltage protection relay KV, and the difference is that one performs voltage detection and the other performs current detection, for example, the voltage transformer in the foregoing example can be replaced by a current transformer, and the preset voltage source can be replaced by a preset current source, so as to implement detection of leakage current, and the detailed operation process is not described in detail here.
In summary, according to the leakage detection and positioning device of the train power supply system in the embodiment of the invention, when the plurality of controllers determine that the at least two first switch assemblies are disconnected according to the leakage signals output by the plurality of leakage protection assemblies, all the power receiving units are controlled to be disconnected from the power grid, and then the vehicle control unit sequentially sends the high-voltage power-on command to each controller after all the power receiving units are disconnected from the power grid, wherein in the process that each power receiving unit is sequentially powered on, if the leakage protection assembly corresponding to any one power receiving unit detects that the train has high-voltage leakage, it is determined that the power receiving unit has load leakage, so as to position the power receiving unit having load leakage, thereby quickly positioning the power receiving unit having load leakage, and performing directional maintenance.
Further, according to an embodiment of the present invention, as shown in fig. 4, each power receiving unit further includes a bidirectional DC-DC converter (e.g., the bidirectional DC-DC converter 112, the bidirectional DC-DC converter 212, and the bidirectional DC-DC converter 312), an on-vehicle battery pack (e.g., the on-vehicle battery pack 113, the on-vehicle battery pack 213, and the on-vehicle battery pack 313), and a second circuit breaker HSCB2 connected between the bidirectional DC-DC converter and the on-vehicle battery pack, wherein, when the first switching assembly is open, if the second circuit breaker HSCB2 is closed, the on-vehicle battery pack supplies power to at least one load through the bidirectional DC-DC converter. It should be noted that the input and output terminals of the bidirectional DC-DC converter are isolated from each other.
Further, when the grid supplies power to the train, if the second circuit breaker HSCB2 is closed, the grid also charges the on-board battery pack through the bidirectional DC-DC converter.
Specifically, in the embodiment of the invention, not only can the train be powered through the power grid, but also the train can be powered through the vehicle-mounted battery pack on the train, and the power grid is preferably used for powering the train in general.
When the train is powered through the power grid, the controller 130 controls the first circuit breaker HSCB1 in the first switch assembly 111 and the first positive contactor KM to be closed to supply power to the power receiving unit 110; the controller 230 controls the first circuit breaker HSCB1 and the first positive contactor KM in the first switching assembly 211 to be closed to supply power to the power receiving unit 210; … are provided. In the process, if the on-board battery pack in the power receiving unit does not need to be supplemented with power, the controller controls the corresponding second circuit breaker HSCB2 to be opened through the 'HSCB 2 control' port, and when the on-board battery pack in the power receiving unit needs to be supplemented with power, the controller controls the corresponding second circuit breaker HSCB2 to be closed through the 'HSCB 2 control' port, and the on-board battery pack is charged through the bidirectional DC-DC converter.
When the train cannot be powered by the power grid, for example, an electric leakage fault occurs, the vehicle-mounted battery pack can be used for supplying power at the moment, for example, the controller 130 controls the first circuit breaker HSCB1 and the first positive contactor KM in the first switch assembly 111 to be both opened and controls the corresponding second circuit breaker HSCB2 to be closed, and at the moment, the vehicle-mounted battery pack supplies power to loads on the train, such as lighting and controller power, through the bidirectional DC-DC converter 112, so that standby power supply for the train is realized, and normal use of partial functions of the train is ensured.
In an embodiment of the invention, the train may be a straddle monorail train.
In summary, according to the leakage detection and positioning device of the train power supply system in the embodiment of the invention, when the plurality of controllers determine that the at least two first switch assemblies are disconnected according to the leakage signals output by the plurality of leakage protection assemblies, all the power receiving units are controlled to be disconnected from the power grid, and then the vehicle control unit sequentially sends the high-voltage power-on command to each controller after all the power receiving units are disconnected from the power grid, wherein in the process of sequentially powering on each power receiving unit, if the leakage protection assembly corresponding to any one power receiving unit detects the high-voltage leakage of the power grid again, it is determined that the power receiving unit has the load leakage, so as to position the power receiving unit having the load leakage, thereby quickly positioning the power receiving unit having the load leakage, so as to perform directional maintenance, and simultaneously realize standby power supply to the train through the on-vehicle battery pack, ensure the normal use of the functions of the train part.
In addition, the embodiment of the invention provides a train power supply system, which comprises the electric leakage positioning device of the train power supply system.
According to the train power supply system of the embodiment of the invention, through the electric leakage positioning device, when the controllers judge that at least two first switch assemblies are disconnected according to electric leakage signals output by the electric leakage protection assemblies, all the power receiving units are controlled to be disconnected with the power grid, then the vehicle control unit sequentially sends a high-voltage power-on command to each controller after all the power receiving units are disconnected with the power grid, wherein in the process that each power receiving unit is sequentially powered on, if the electric leakage protection assembly corresponding to any power receiving unit detects that the train has high-voltage electric leakage again, the power receiving unit with load electric leakage is judged to have load electric leakage so as to position the power receiving unit with load electric leakage, so that the power receiving unit with load electric leakage can be quickly positioned for directional maintenance, and meanwhile, standby power supply to the train can be realized through the vehicle-mounted battery pack, ensure the normal use of the functions of the train part.
In addition, the embodiment of the invention also provides a train, which comprises the electric leakage positioning device of the train power supply system.
According to the train of the embodiment of the invention, through the electric leakage positioning device, when the controllers judge that at least two first switch assemblies are disconnected according to electric leakage signals output by the electric leakage protection assemblies, all the power receiving units are controlled to be disconnected with the power grid, then the vehicle control unit sequentially sends a high-voltage power-on command to each controller after all the power receiving units are disconnected with the power grid, wherein in the process that each power receiving unit is sequentially powered on, if the electric leakage protection assembly corresponding to any power receiving unit detects the high-voltage electric leakage of the power grid again, the power receiving unit with the load electric leakage is judged to have the load electric leakage so as to position the power receiving unit with the load electric leakage, so that the power receiving unit with the load electric leakage can be quickly positioned for directional maintenance, and meanwhile, the standby power supply to the train can be realized through the vehicle-mounted battery pack, ensure the normal use of the functions of the train part.
Fig. 5 is a flowchart of a leakage detection positioning method of a train power supply system according to an embodiment of the invention.
In an embodiment of the present invention, as shown in fig. 1, a train power supply system includes a plurality of power receiving units, a power grid for supplying power to the plurality of power receiving units, each of the plurality of power receiving units including at least one load, and a first switch assembly for controlling whether the power grid supplies power to the at least one load.
As shown in fig. 5, the leakage detecting and positioning method of the train power supply system according to the embodiment of the present invention may include the following steps:
and S1, detecting whether the train has high-voltage electric leakage of the power grid through each electric leakage protection component connected between the train body of each power receiving unit and the high-voltage negative pole of the power grid.
And S2, when detecting that the high-voltage electric leakage of the power grid occurs to the train, triggering the first switch assembly in the corresponding power receiving unit to be disconnected, and outputting an electric leakage signal.
And S3, controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal.
And S4, after all the power receiving units are disconnected from the power grid, sequentially sending a high-voltage power-on command to the controller corresponding to each power receiving unit, so that each controller respectively controls the first switch assembly correspondingly to sequentially power on each power receiving unit.
And S5, in the process that each power receiving unit is sequentially electrified, if the electric leakage protection component corresponding to any power receiving unit detects that the train has high-voltage electric leakage, determining that the power receiving unit has load electric leakage so as to position the power receiving unit with the load electric leakage.
According to one embodiment of the present invention, as shown in fig. 1, each of the first switch assemblies includes: the device comprises a first circuit breaker HSCB1 and a first positive contactor KM, wherein one end of the first circuit breaker HSCB1 is connected with a high-voltage positive electrode of a power grid; one end of the first positive contactor KM is connected to the other end of the first circuit breaker HSCB1, the other end of the first positive contactor KM is connected to the positive terminal of the at least one load, and the negative terminal of the at least one load is connected to the high voltage negative terminal of the grid. When detecting that the train has high-voltage electric leakage of a power grid, each electric leakage protection assembly triggers the corresponding first circuit breaker HSCB1 to be disconnected so as to disconnect the first switch assembly in the corresponding power receiving unit, and sends an electric leakage signal to the corresponding controller.
Further, each controller controls all power receiving units to be disconnected from the grid by controlling the first circuit breaker HSCB1 and the first positive contactor KM in the corresponding power receiving unit to be opened.
Further, after receiving the high-voltage power-on command, each controller controls the first circuit breaker HSCB1 and the first positive contactor KM in the corresponding power receiving unit to close, so as to power on the corresponding power receiving unit.
It should be noted that, for details that are not disclosed in the electric leakage detection positioning method of the train power supply system according to the embodiment of the present invention, please refer to details that are disclosed in the electric leakage detection positioning device of the train power supply system according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the electric leakage detection and positioning method of the train power supply system, when the disconnection of at least two first switch assemblies is judged according to electric leakage signals output by the plurality of electric leakage protection assemblies, all power receiving units are controlled to be disconnected with a power grid, then, after all power receiving units are disconnected with the power grid, high-voltage power-on instructions are sent to each controller in sequence, in the process that each power receiving unit is powered on in sequence, if the electric leakage protection assembly corresponding to any power receiving unit detects the high-voltage electric leakage of the power grid of the train again, the power receiving unit with the load electric leakage is judged to generate the load electric leakage, so that the power receiving unit with the load electric leakage is positioned, and the power receiving unit with the load electric leakage can be positioned quickly so as to perform directional maintenance.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. An electric leakage detection positioning device of a train power supply system, wherein the train power supply system comprises a plurality of power receiving units and a power grid for supplying power to the power receiving units, each power receiving unit in the power receiving units comprises at least one load and a first switch assembly for controlling whether the power grid supplies power to the at least one load, and the electric leakage detection positioning device comprises:
each leakage protection assembly is correspondingly connected between a train body of the corresponding power receiving unit and a high-voltage negative electrode of the power grid, and is used for detecting whether the train has high-voltage power leakage of the power grid or not, and triggering a first switch assembly in the corresponding power receiving unit to be disconnected and outputting a leakage signal when the train has the high-voltage power leakage of the power grid;
the controllers are used for controlling all the power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal;
a vehicle control unit, configured to send a high-voltage power-on command to each controller in sequence after all power receiving units are disconnected from the power grid, so that each controller respectively controls the first switch assembly to power on each power receiving unit in sequence, where,
in the process that each power receiving unit is sequentially electrified, if the electric leakage protection assembly corresponding to any power receiving unit detects the occurrence of high-voltage electric leakage of the power grid of the train again, the vehicle control unit judges that the power receiving unit has load electric leakage so as to position the power receiving unit with the load electric leakage.
2. The electrical leakage detection positioning apparatus for a train power supply system according to claim 1, wherein each first switch assembly includes:
one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid;
one end of the first positive contactor is connected with the other end of the first circuit breaker, the other end of the first positive contactor is connected to the positive end of the at least one load, and the negative end of the at least one load is connected to the high-voltage negative pole of the power grid;
when detecting that the train has high-voltage electric leakage, each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected so as to disconnect a first switch assembly in a corresponding power receiving unit, and sends an electric leakage signal to a corresponding controller.
3. The electrical leakage detection positioning device of a train power supply system according to claim 2, wherein each of the plurality of controllers controls all of the power receiving units to be disconnected from the power grid by controlling the first circuit breaker and the first positive contactor in the corresponding power receiving unit to be disconnected.
4. The electrical leakage detection positioning device of a train power supply system according to claim 3, wherein each controller controls the first circuit breaker and the first positive contactor in the corresponding power receiving unit to close after receiving the high voltage power-on command, so as to power on the corresponding power receiving unit.
5. An earth leakage detection locating device of a train power supply system as claimed in any one of claims 1-4, characterized in that each earth leakage protection assembly comprises an over-current protection relay or an over-voltage protection relay.
6. The electrical leakage detection positioning device of a train power supply system according to claim 1, wherein each of said power receiving units further comprises a bidirectional DC-DC converter, an on-board battery pack, and a second circuit breaker connected between said bidirectional DC-DC converter and said on-board battery pack, wherein,
when the first switch assembly is open, the on-board battery pack supplies power to the at least one load through the bi-directional DC-DC converter if the second circuit breaker is closed.
7. The electrical leakage detection positioning apparatus for a train power supply system according to claim 6, wherein when said electrical network supplies power to a train, said electrical network also charges said on-board battery pack through said bidirectional DC-DC converter if said second circuit breaker is closed.
8. A train power supply system characterized by comprising the electric leakage detection positioning device of the train power supply system according to any one of claims 1 to 7.
9. A train comprising a leakage detection positioning device of the train power supply system according to any one of claims 1 to 7.
10. An electric leakage detection positioning method for a train power supply system, wherein the train power supply system comprises a plurality of power receiving units and a power grid for supplying power to the plurality of power receiving units, each of the plurality of power receiving units comprises at least one load and a first switch assembly for controlling whether the power grid supplies power to the at least one load, and the electric leakage detection positioning method comprises the following steps:
detecting whether the train has high-voltage electric leakage of the power grid through each electric leakage protection component connected between the train body of each power receiving unit and the high-voltage negative pole of the power grid;
when detecting that the train has high-voltage electric leakage of a power grid, triggering a first switch assembly in a corresponding power receiving unit to be disconnected and outputting an electric leakage signal;
controlling all power receiving units to be disconnected with the power grid when the at least two first switch assemblies are judged to be disconnected according to the electric leakage signal;
after all the power receiving units are disconnected with the power grid, sequentially sending a high-voltage power-on instruction to the controller corresponding to each power receiving unit, so that each controller respectively controls the first switch assembly correspondingly to enable each power receiving unit to be powered on sequentially;
in the process that each power receiving unit is sequentially electrified, if the electric leakage protection component corresponding to any power receiving unit detects the occurrence of high-voltage electric leakage of the power grid of the train again, the power receiving unit is judged to have load electric leakage so as to position the power receiving unit with the load electric leakage.
11. The electrical leakage detection positioning method according to claim 10, wherein each first switch assembly comprises:
one end of the first circuit breaker is connected with a high-voltage positive pole of the power grid;
one end of the first positive contactor is connected with the other end of the first circuit breaker, the other end of the first positive contactor is connected to the positive end of the at least one load, and the negative end of the at least one load is connected to the high-voltage negative pole of the power grid;
when detecting that the train has high-voltage electric leakage, each electric leakage protection assembly triggers a corresponding first circuit breaker to be disconnected so as to disconnect a first switch assembly in a corresponding power receiving unit, and sends an electric leakage signal to a corresponding controller.
12. The electrical leakage detection positioning method according to claim 11, wherein each controller controls all the power receiving units to be disconnected from the power grid by controlling the first circuit breaker and the first positive contactor in the corresponding power receiving unit to be disconnected.
13. The electrical leakage detection positioning method according to claim 12, wherein each controller controls the first circuit breaker and the first positive contactor in the corresponding power receiving unit to close after receiving the high voltage power-on command, so as to power on the corresponding power receiving unit.
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| CN110045220A (en) * | 2019-04-18 | 2019-07-23 | 青岛经济技术开发区海尔热水器有限公司 | A kind of electrical leakage detecting method and intelligent appliance system |
| CN112230044B (en) * | 2019-06-28 | 2022-05-13 | 比亚迪股份有限公司 | Train and electric leakage detection method thereof, whole vehicle controller and traction control unit |
| CN114643867B (en) * | 2020-12-21 | 2024-02-27 | 长沙中车智驭新能源科技有限公司 | Power-on and power-off control method for pure electric vehicle and whole vehicle high-voltage topological structure |
| CN113771630B (en) * | 2021-09-24 | 2023-08-25 | 中车长春轨道客车股份有限公司 | Urban railway vehicle grounding protection circuit |
| CN114047457A (en) * | 2021-10-21 | 2022-02-15 | 深圳市道通科技股份有限公司 | Fault detection positioning method and device, electronic equipment and storage medium |
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