JP2018050379A - Ac-dc electric rolling stock and method for switching operation platform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC-DC electric rolling stock provided to an operation section composed of an AC section and a DC section, and capable of exchanging an operation platform in equipment handling common with equipment handling in exchanging the operation platform of the DC electric rolling stock provided only in the DC section.SOLUTION: An AC-DC electric rolling stock includes: a master control handle and a reverser which are respectively provided with respective operation platforms of both leading vehicles of the AC-DC electric rolling stock; a through line threaded in the whole of the formation of the AC-DC electric rolling stock; an AC-DC switching device switching an AC main circuit or a DC main circuit to constitute a main circuit; a vacuum circuit breaker protecting the main circuit; a vacuum circuit breaker input circuit connected to the through line and opening/closing the vacuum circuit breaker; and a control circuit controlling energization of the through line by operation of the master control handle and the reverser and operating the vacuum circuit breaker input circuit to control the opening/closing of the vacuum circuit breaker.SELECTED DRAWING: Figure 3

Description

  The present invention operates both a DC electrification section and an AC electrification section connected via a non-electric section, and a vacuum circuit breaker (VCB: hereinafter referred to as “VCB”) on the vehicle. The present invention relates to an AC / DC electric vehicle including an AC / DC switching device.

  In Patent Document 1, a DC electrification section (hereinafter referred to as “DC section”) and an AC electrification section (hereinafter referred to as “AC section”) are mutually inserted, a vacuum circuit breaker (VCB), An AC / DC electric vehicle having a circuit, an AC main circuit, and an AC / DC switching device (AC / DC switching device) for selecting either the AC main circuit or the DC main circuit is disclosed.

  This AC / DC switching device suppresses the release operation delay of the DC voltage detection relay in the no-voltage section, and prevents the DC power supply short circuit even when the contactor is short-circuited. A first contactor with 1 contact and 1 contact that turns on in the AC section and turns off in the DC section is installed between the (+) side and the (+) side of the input line of the auxiliary circuit. Between the one terminal and the grounding device, a second contactor having one circuit and one contact that is turned off in the AC section and turned on in the DC section is provided.

JP-A-9-65507

  In some cases, a DC electric vehicle that is used for business only in the DC section and an AC electric vehicle that is used for business across the DC section and the AC section are introduced into the operation section including the DC section and the AC section. . In this case, a DC electric vehicle and an AC / DC electric vehicle handle the driver's cab equipment by the crew when switching (switching) the cab of one (leading vehicle) to the cab of the other (tail vehicle) handled at the terminal station, etc. In common, there is a need to reduce the burden of handling the equipment of crew members on both electric vehicles and reduce forgetting to handle equipment.

  An object of the present invention is an AC / DC electric vehicle provided in an operation section composed of a direct current section and an alternating current section, and is common to the handling of driving equipment when replacing a cab of a direct current electric car provided only in the direct current section. The object is to provide an AC / DC electric vehicle capable of exchanging (switching) the driver's cab when handling driving equipment.

  In order to solve the above-described problems, an AC / DC electric vehicle according to the present invention includes a mascon handle and a lever that are provided in the cabs of both leading vehicles, and a lead-through line that is passed through the entire formation of the AC / DC electric vehicle. And AC / DC switching device that switches the AC main circuit or DC main circuit to configure the main circuit, a vacuum circuit breaker that protects the main circuit, and a vacuum circuit breaker that is connected to the lead-through line and opens and closes the vacuum circuit breaker A circuit and a control circuit that controls energization of the lead-through line by operating the mass control handle and the lever and operates a vacuum circuit breaker closing circuit to control opening and closing of the vacuum circuit breaker.

  According to the present invention, it is an AC / DC electric car that is provided in an operation section composed of a direct current section and an alternating current section, and is treated as a device that is common to the equipment at the time of replacing the cab of the direct current electric car that is provided to the direct current section It is possible to provide an AC / DC electric vehicle capable of exchanging cabs.

FIG. 1 is a schematic diagram of a business route composed of a DC section and an AC section in which the AC / DC electric vehicle according to the present invention is directly operated. FIG. 2 is a flowchart showing the work procedure of the cab equipment handled by the crew when exchanging (switching) the cab of the AC / DC electric vehicle according to the present invention. FIG. 3 is a cross-sectional view of a control circuit for controlling the opening / closing of the vacuum circuit breaker of the AC / DC electric vehicle according to the present invention. FIG. 4 is a diagram showing a state of the control circuit immediately after the AC / DC electric vehicle according to the present invention arrives at the A station. FIG. 5 is a diagram showing a state of a control circuit (operation of CT1) when the AC / DC electric vehicle according to the present invention is exchanging the cab from CT1 to CT2 at the A station. FIG. 6 is a diagram showing a state of a control circuit (operation of CT2) when the AC / DC electric vehicle according to the present invention is exchanging the cab from CT1 to CT2 at the A station. FIG. 7 is a diagram illustrating a state of the control circuit after the cab replacement (switching) is completed at the A station of the AC / DC electric vehicle according to the present invention. FIG. 8 is a timing chart of the relay sequence of the control circuit of the vacuum circuit breaker.

  The present invention eliminates the need for manual operation of the vacuum circuit breaker in order to realize the handling of the driving equipment accompanying the exchange (switching) of the cab in the AC / DC electric vehicle in common with the handling in the case of the DC electric vehicle. A control circuit is provided.

Embodiments of the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic diagram of a business route composed of a DC section and an AC section in which the AC / DC electric vehicle according to the present invention is directly operated. The business route (operation section) is a section from A station to B station through C station, where A station is located in AC section AC, and B station and C station are located in DC section DC. The AC section AC and the DC section DC are connected through a non-wired section DS having a predetermined length.

  The AC / DC electric vehicle 1 is an electric vehicle that can travel in both the AC section AC around the overhead line voltage 20 kV and the DC section DC around the overhead line voltage 1500 V by means of an on / off switching device (not shown) mounted on the vehicle. Moreover, the AC / DC electric vehicle 1 includes a circuit in which a vacuum circuit breaker (VCB), an AC / DC switching device, a main transformer, a converter, an inverter, and a main motor are sequentially connected as a basic configuration.

When the AC / DC switching device selects an AC main circuit, a circuit consisting of a main transformer, converter, inverter, and main motor is configured as the main circuit corresponding to the AC section AC, and the AC / DC switching device selects the DC main circuit. In this case, a circuit including an inverter and a main motor is configured as the main circuit corresponding to the DC section DC.
On the other hand, a DC electric vehicle basically includes only a high-speed circuit breaker (HB) or a main circuit including a fuse, an inverter, and a main motor that are blown when an overcurrent flows.

  When the AC / DC electric vehicle 1 passes between the DC section DC and the AC section AC via the non-electric section DS, when the AC / DC electric vehicle 1 passes through (including before) the non-electric section DS, first, a vacuum is cut off. Open the vessel. Subsequently, after the AC / DC switching device configures either the main circuit corresponding to direct current or the main circuit corresponding to alternating current, the vacuum circuit breaker is turned on again, and the power supply type (direct current section DC or alternating current section AC) ) Continue operation by the main circuit configured corresponding to

  In FIG. 1, the operation section A1 of the AC / DC electric vehicle 1 is the entire line from the station A positioned at the end of the AC section AC to the station C positioned at the end of the DC section DC through the non-electric section DS. On the other hand, the operation section D1 of the DC electric vehicle is a line section extending from the B station located near one end of the DC section DC to the C station located at the other end of the DC section DC.

  In the AC / DC electric vehicle 1, a crew member who operates the AC / DC electric vehicle 1 at the A station in the AC section AC and the B station or the C station in the DC section DC has a driver's cab of one leading vehicle (CT1; see FIG. 2). Is replaced (switched) with the cab of the other leading vehicle (CT2; see FIG. 2) to change the traveling direction. Similarly, a DC electric vehicle (not shown) changes the traveling direction by exchanging (switching) the cab at the B station and the C station in the DC section.

  FIG. 2 is a flowchart showing a work procedure of the cab equipment handled by the crew when exchanging (switching) the cab of the AC / DC electric vehicle 1 according to the present invention. The AC / DC electric vehicle 1 headed by the head vehicle CT1 enters the station A at the end of the AC section AC and stops at a predetermined stop position, and then the cab of one head vehicle CT1 is moved to the other head vehicle (rear tail). The following describes the handling of the cab equipment when the vehicle is replaced (switched) to the cab of CT2.

  The equipment that the crew handles when exchanging (switching) the driver's cab includes a master controller handle (hereinafter referred to as “mascon handle”) that commands acceleration / deceleration (including brake) to the electric vehicle, and a lever controller that switches the traveling direction of the electric vehicle. (Reversing handle or reversing machine).

The mascon handle has four types of positions (positions), that is, a plurality of notch positions for commanding acceleration, a cutting position for cutting (turning off) the notch when coasting, and a brake position and a sampling position for commanding a brake. Among them, the brake positions are broadly classified into a plurality of “normal” brake positions provided during normal braking and an “emergency” brake position provided during an emergency or stop.
The leversa has a “front” position, a “off” position, and a “rear” position.

  In the AC / DC electric vehicle 1 immediately after entering the station A and stopping at a predetermined position, the lever of one leading vehicle CT1 is placed at the “front” position, and the mascon handle is placed at the “emergency” brake position. At this time, the lever of the other leading vehicle CT2 (rear vehicle) is placed in the “cut” position, and the mascon handle is placed in the “drawing” position (see FIG. 4).

  From this state, when the crew member switches the cab for controlling the operation of the AC electric vehicle 1 from one leading vehicle CT1 to the other leading vehicle CT2 (rear vehicle), the crew member first switches the lever of the leading vehicle CT1 to “ Switching from the “front” position to the “cut” position, the mascon handle in the “emergency” brake position is placed in the “extraction” position (see FIG. 5).

  Next, the crew member who has moved from the cab of one leading vehicle CT1 to the cab of the other leading vehicle CT2 places the mascon handle in the “extraction” position of the other leading vehicle CT2 in the “emergency” brake position, The lever switch is switched from the “off” position to the “front” position (see FIG. 6).

  The AC / DC electric vehicle 1 restarts the power supply to the main circuit after the AC / DC switching device is handled, and the vacuum circuit breaker OFF switch that opens the vacuum circuit breaker before the AC / DC switching device is handled and cuts the power supply to the main circuit. A vacuum circuit breaker switch is provided. Here, even if the mascon handle in the “emergency” brake position of one leading vehicle CT1 is placed in the “sampling” position, the mascon handle of the other leading vehicle CT2 is placed in the “sampling” position. The mascon handles of the driver's cabs of the leading vehicles CT1 and CT2 at both ends of the DC electric vehicle 1 are both placed in the “sampling” position, and the vacuum circuit breaker is automatically turned off (turned off).

  For this reason, if it is normal (when the present invention is not applied), the crew member who is in charge of the AC / DC electric vehicle 1 replaces (switches) the cab so that the vacuum circuit breaker switch that the DC electric vehicle does not have The crew members who are in charge of both the DC electric vehicle and the AC electric vehicle 1 may be forced to operate the equipment according to the electric vehicle on which they are on board.

  FIG. 3 is a jump figure of a control circuit for controlling the opening / closing of the vacuum circuit breaker of the AC / DC electric vehicle according to the present invention. FIGS. It is a figure which shows the state of the control circuit until the completion time which switches the cab of the head vehicle CT1 to the cab of the other head vehicle CT2. FIG. 8 is a timing chart of the relay sequence of the control circuit of the vacuum circuit breaker.

  Referring to FIGS. 3 to 8, when switching the cab of one leading vehicle CT1 of the AC / DC electric vehicle 1 to the cab of the other leading vehicle CT2, the same master control handle and lever operation as the DC electric vehicle are performed. The configuration of the control circuit of the vacuum circuit breaker that can replace (switch) the cab will be described. As a result, it is possible to suppress the opening (OFF) operation of the vacuum circuit breaker that requires the crew member to re-inject the vacuum circuit breaker.

  Here, the control circuit of the vacuum circuit breaker described above has a plurality of electromagnetic relays (electromagnetic relays) that combine a coil (electromagnet) and a contact that opens and closes depending on whether or not the coil is energized. Although not specified in the following description, the control circuit of the vacuum circuit breaker includes each coil and each contact, and includes a plurality of electromagnetic relays (electromagnetic relays) having these names.

  Immediately after arriving at a predetermined position of a terminal station (for example, station A in FIG. 1), as shown in FIG. 4, in the cab of one leading vehicle CT1 of the AC / DC electric vehicle 1, the lever 18 is "front". In position, the mascon handle 16 is placed in the “emergency” brake position. At this time, the VCB closing head relay contact 11 is closed, and the line 70 is energized from the line 70 of one leading vehicle CT1 to the line 79 through the VCB closing head relay contact 11 (the energization indicated by the broken line in FIG. 4). Route, see).

  The line 79 corresponds to a lead-through line that is passed over the entire formation of the AC / DC electric vehicle 1 from one leading vehicle CT1 through the intermediate vehicle TM to the other leading vehicle CT2. Connected to the line 79 is a vacuum circuit breaker closing circuit (hereinafter referred to as “VCB closing circuit”) 100 having a coil for opening / closing (ON / OFF) the vacuum circuit breaker (VCB). If the line 79 is energized, the VCB closing circuit 100 connected to the line 79 closes the vacuum circuit breaker, so that the main circuit can be energized and the electric vehicle can operate.

  3 to 7, only one line 79 is shown. However, the line 79a (not shown) that is energized when the AC / DC switching device selects the DC main circuit, and the AC / DC switching device selects the AC main circuit. A wire 79b (not shown) that is energized at the time may be drawn over the entire knitting. In this case, the VCB input circuit 100 is connected to the line 79a and the line 79b, and either the line 79a or the line 79b is connected to an AC / DC head relay that is linked to a power supply type (DC or AC) selected by the AC / DC switching device. (Not shown).

  Note that when the head relay contact for vacuum circuit breaker closing (hereinafter referred to as “VCB head relay contact”) 11 (21) is opened and the line 79 is de-energized, the VCB closing circuit 100 is de-energized and the vacuum breaker is disconnected. The vessel opens. For this reason, in order to close (re-inject) the vacuum circuit breaker, the crew must manually handle the vacuum circuit breaker on / off switch (hereinafter referred to as “VCB on / off switch”) 32 (34) provided on the cab. It is necessary to energize the line 79 and energize the VCB input circuit 100.

<Step S10> (see FIGS. 2, 5, and 8)
When the crew member switches the lever lever 18 from the “front” position to the “off” position at the cab of one of the leading vehicles CT1, as shown in FIG. 5, the lever relay coil 18r is de-energized and the lever relay relay contact 18a is turned on. At the same time as closing (FIG. 8), the lever relay contact 18b opens (refer to the energization path indicated by the broken line in FIG. 5).

<Step S20> (see FIGS. 2, 5, and 8)
When the master control handle 16 is replaced from the “emergency” brake position to the “withdrawal” position, the head relay coil (not shown) is not energized, the head relay contact 17a is opened (FIG. 8) and the head relay contact 17b is closed. By closing the head relay contact 17b, a vacuum circuit breaker auxiliary auxiliary time limit relay coil (hereinafter referred to as "VCB input auxiliary time limit relay coil") 14r connected to the line 73 is energized, and the vacuum circuit breaker auxiliary auxiliary voltage is supplied. The time limit contact (hereinafter referred to as “VCB input auxiliary time limit contact”) 14 is closed (FIG. 8).

<Step S30> (see FIGS. 2, 6, and 8)
The crew member who has moved from the cab of one leading vehicle CT1 to the cab of the other leading vehicle CT2 replaces the mascon handle 26 from the “extraction” position to the “emergency” brake position. By placing the mascon handle 26 in the “emergency” brake position, the head relay coil (not shown) is energized, the head relay contact 27a is closed (FIG. 8), and the head relay contact 27b is opened.

  By opening the head relay contact 27b, the VCB closing auxiliary time limit relay coil 24r connected via the wire 76 is de-energized, and after 2 seconds, the vacuum circuit breaker closing auxiliary time limit relay contact (hereinafter referred to as "VCB") is turned off. 24 "(referred to as an auxiliary time limit relay contact for closing) is opened (FIG. 8).

  Here, the auxiliary timing relay contact 24 for turning on the VCB has an off-delay function in which the contact opens after a predetermined time has elapsed since the energization of the auxiliary timing relay coil 24r for turning on the VCB is stopped. For this reason, the VCB input auxiliary time limit relay contact 24 is opened after 2 seconds have elapsed since the energization of the VCB input auxiliary time limit relay coil 24r is lost due to the open state of the head relay contact 27b. Here, the predetermined time is 2 seconds in the present invention, but is not necessarily limited to this time. Changes within the allowable range can be made according to the specifications and conditions. For example, there is no particular problem as long as the relay operates reliably in order with a width of about 1 to 3 seconds.

  The head relay contact 27a, line 74, VCB auxiliary auxiliary time relay contact 24, line 75, and vacuum circuit breaker auxiliary auxiliary coil (hereinafter referred to as "VCB auxiliary auxiliary relay") are connected to the line 70 of the other leading vehicle CT2. 25r "is connected. Since the auxiliary timing relay contact 24 for closing the VCB is kept closed for 2 seconds as described above, the auxiliary relay coil 25r for closing the VCB is energized via the wires 70, 74 and 75, and the auxiliary relay for closing the vacuum circuit breaker. The contact (hereinafter referred to as “VCB input auxiliary relay contact”) 25 also remains closed (FIG. 8).

  While the VCB closing auxiliary relay contact 25 continues to be closed, the vacuum circuit breaker closing head relay coil (hereinafter referred to as “VCB closing head relay coil”) 21r (S) is energized via the line 77. , VCB closing head relay contact 21 is closed (FIG. 8). When this VCB closing head relay contact 21 is closed, the line 70 connected to the VCB closing circuit 100 is energized from the line 70 of the other leading vehicle CT2 via the line 78 (the energizing path indicated by the broken line in FIG. 6). ,reference).

  The auxiliary relay contact 25 for closing the VCB is connected to a line provided in parallel to the VCB closing push switch 34 that is manually handled by the crew when the vacuum circuit breaker is opened, so that the crew manually handles the VCB throwing push switch 34. Without energization, the line 79 to which the VCB input circuit 100 is connected can be energized. At this time, the line 79 is energized from both the line 70 of the leading vehicle CT1 and the line 70 of the other leading vehicle CT2 (see energization path indicated by the broken line in FIG. 6).

  When 2 seconds have elapsed after the energization of the VCB auxiliary auxiliary relay coil 24r, the VCB auxiliary auxiliary relay contact 24 is opened, the VCB auxiliary coil 25r is de-energized, and the VCB auxiliary relay contact 25 is opened. , The VCB input head relay coil 21r (S) is not energized.

  The VCB input head relay contact 21 is energized even after the set (S) coil is de-energized in combination with the VCB input head relay coil 21r (S) and the VCB input head relay coil 21r (T). A latching function for maintaining the state of the contacts. Therefore, even after the VCB input head relay coil 21r (S) is de-energized, the VCB input head relay contact 21 continues to be closed until the VCB input head relay coil 21r (T) is energized. (FIG. 8).

<Step S40> (see FIGS. 2 and 6 to 8)
When the lever lever 28 is switched from the “OFF” position to the “front” position at the cab of the other leading vehicle CT2, the lever relay coil 28r is energized and the lever relay contact 28b is closed. When the lever relay contact 28b is closed, the line 70, the master control handle 26, the lever control 28, the line 71, the lever relay contact 28b, the line 72 (intermediate vehicle TM) of the other leading vehicle CT1, the line 72 of the one leading vehicle CT1, and the lever relay contact The VCB insertion head relay coil 11r (T) is energized via 18a and the line 80 (see energization path indicated by broken lines in FIG. 7).

The VCB input head relay contact 11 is combined with the VCB input head relay coil 11r (S) and the VCB input head relay coil 11r (T), and even after the set coil (S) is de-energized, the trip ( T) A latching function for maintaining a contact state when the set (S) coil is energized until the coil is energized is provided.
With this function, the VCB input head relay contact 11 that continues to be closed even when the VCB input head relay coil 11r (S) is de-energized is opened along with the energization of the VCB input head relay coil 11r (T). (FIG. 8).

  Since the VCB closing head relay contact 11 of one leading vehicle CT1 is opened, the line 79 connected to the VCB closing circuit 100 via the line 81 is not energized, but the line 79 is energized from the other leading vehicle CT2. Accordingly, the vacuum circuit breaker is continuously charged (see the energization path indicated by the broken line in FIG. 7).

  In the circuit configuration described above, in particular, the line 77 having the VCB closing head relay coil 21r (S) for opening and closing the VCB closing head relay contact 21 that determines whether or not the line 79 connected to the VCB closing circuit 100 is energized is connected to the VCB. There is a feature in a configuration in which a closing push switch 34 and a VCB closing auxiliary relay contact 25 are provided in parallel.

  With this configuration, manual handling of the VCB input push switch 34 by the crew can be omitted, and the VCB input head relay coil 21r (S) is energized by operating only the mascon handle 26 common to the DC electric vehicle, and the VCB is input. This creates a situation in which the line 79 to which the circuit 100 is connected is always energized, eliminating the need for manual operation of the vacuum circuit breaker by the crew.

  Therefore, according to the present invention, when the crew member who is in charge of the AC / DC electric vehicle 1 replaces (switches) the cab of one leading vehicle with the cab of the other leading vehicle, only the operation of the master control handle and lever lever is performed. Handling is sufficient, and it is not necessary to manually handle a vacuum circuit breaker mounted only on the AC / DC electric vehicle 1 but not mounted on the DC electric vehicle. That is, it is possible to make the handling of the driving equipment accompanying the exchange (switching) of the cab of the AC / DC electric car 1 common to the handling in the case of the DC electric car. Thereby, while being able to reduce a burden of a crew member, it is possible to suppress forgetting to restart the vacuum circuit breaker.

DESCRIPTION OF SYMBOLS 1 ... AC / DC electric car A1 ... AC / DC electric vehicle operation section, D1 / DC electric car operation section, AC / AC electric section
DC ... DC electrification section, DS ... Non-electric section (dead section), CT1 ... One leading vehicle,
CT2 ... other leading vehicle, TM ... intermediate wheel 16, 26 ... master control handle (master control handle)
18, 28... Lever lever 17 a, 17 b, 27 a, 27 b... Head relay contact 18 a, 18 b, 28 a, 28 b... Lever relay contact 11, 21... VCB insertion head relay contact 11 r (S), 11 r (T) , 21r (T) ... VCB head relay coil (latching)
14, 24 ... VCB input auxiliary time limit relay contacts 14r, 24r ... VCB input auxiliary time limit relay coils 15, 25 ... VCB input auxiliary relay contacts 15r, 25r ... VCB input auxiliary relay coils 32, 34 ... VCB input press switch 70-81 ... line 100 ... VCB input circuit

Claims (6)

A mascon handle and lever that each cab of the leading vehicle of both AC and DC electric vehicles has,
A lead-through line led through the entire organization of the AC / DC electric vehicle,
An AC / DC switching device that configures a main circuit by switching an AC main circuit or a DC main circuit;
A vacuum circuit breaker protecting the main circuit;
A vacuum circuit breaker closing circuit that is connected to the lead-through line and opens and closes the vacuum circuit breaker;
An AC / DC electric vehicle comprising: a control circuit for controlling energization of the lead-through line by operating the mascon handle and the lever and operating the vacuum circuit breaker closing circuit to control opening and closing of the vacuum circuit breaker. The AC / DC electric vehicle according to claim 1,
The control circuit is provided corresponding to each of the cabs,
A head relay that operates by switching the mascon handle provided in each of the cabs;
A vacuum circuit breaker auxiliary relay that operates continuously for a predetermined time with the operation of the head relay,
A vacuum circuit breaker closing head relay that controls the energization of the lead-through wire by operating along with the operation of the vacuum breaker closing auxiliary relay;
A vacuum breaker closing push switch connected in parallel with the vacuum breaker closing auxiliary relay and connected in series with a relay coil that opens and closes a relay contact of the vacuum breaker closing head relay; AC electric car to do. The AC / DC electric vehicle according to claim 2,
The control circuit includes:
Having an auxiliary time limit relay for vacuum circuit breaker operation that operates in conjunction with the operation of the head relay,
The AC electric vehicle according to claim 1, wherein the vacuum breaker closing auxiliary relay operates continuously for the predetermined time by the time limit operation of the vacuum breaker closing auxiliary time limit relay. The AC / DC electric vehicle according to claim 2 or 3,
The control circuit includes:
An AC / DC electric vehicle comprising a lever relay that operates by switching the lever unit provided in each of the driver's cabs. The AC / DC electric vehicle according to any one of claims 1 to 4,
The lead-through line is
A first lead-through line selected when the AC / DC switching device configures the DC main circuit;
An AC / DC electric vehicle comprising: a second lead line selected when the AC / DC switching device constitutes the AC main circuit. A method for switching cabs in an AC / DC electric vehicle according to claim 4,
A first step of replacing the mass control handle of the driver's cab from the emergency brake position to the sampling position after switching the lever of the driver's cab from the front position to the cutting position;
A cab switching method comprising the second step of switching the lever control of the cab from the cut position to the front position after replacing the master control handle of the other cab from the extraction position to the emergency brake position.

Images