JPH10966A - Protector of ac electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To capacitate an AC electric vehicle to pass through an alternate section, where there is a large difference in electric power phase, without hindrance. SOLUTION: In this protector of an AC electric vehicle 4, when this vehicle 4 passes through an alternate section 2, where two feeder sections 1a and 1b different in substation a A and B each are butted with each other, a phase difference among AC powers from the substation feeding these feeder sections by a controller on the ground side is detected, and when this phase difference is compared with the reference value and there is a larger phase difference than the reference value, a main breaker opening command is transmitted to the onboard side by a grounder 3. When a pickup maker 5 received this main breaker opening command at the onboard side, a main breaker 8 is opened, interrupting an auxiliary circuit of the AC electric vehicle. With this, when this electric vehicle is passed through the alternate section, something wrong with a phase converter, a rotary machine or the like as well as deformation in a coil of a main transformer producible due to the phase difference in AC power at the substation in front and in rear of the alternate section are all prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for an AC electric vehicle in a section for switching AC power from different substations.

[0002]

2. Description of the Related Art In an AC electric railway system, there are two different substations, each of which is called a section, every several tens of kilometers in an AC electrified section. In this cross section, train lines are laid at intervals between the feeders from the respective substations so that pantographs do not short-circuit between different substations when vehicles pass.

[0003] On the other hand, if the substations of the same electric power company have the same power supply, even if they are from different substations, the AC power phases are almost the same. The phase of the AC power often shifts.

Normally, even if such a phase shift occurs in the sections, the two substations are not short-circuited as described above, so that no accident occurs due to the short-circuit current. In addition, in the case of AC electric vehicles, in order to protect the main circuit, it is necessary to always pass through the section at the notch-off. Does not occur.

However, when a phase converter for producing a three-phase alternating current from a single-phase alternating current stepped down by a main transformer is used as a power source for an auxiliary circuit load such as a blower or an air compressor,
Even if the crew notch-offs, the phase converter continues to receive power from the train line through the main transformer even when crossing sections.

Further, when an auxiliary circuit is constituted by a single-phase motor without using a phase converter to generate three-phase alternating current, or a single-phase alternating current supplied from a locomotive such as a passenger car is used as a power supply. Regarding the circuit, even when the crew notch-offs, power is continuously supplied from the train line when passing through the sections.

[0007]

In the case of an AC electric vehicle having a circuit configuration in which electric power is continuously supplied from a train line when passing through such a cross section, there are the following problems.

When a phase converter for producing a three-phase alternating current from a single-phase alternating current stepped down by a main transformer is used as a power source of an auxiliary circuit, the phase converter alternately operates the phase of AC power of a substation before passing through sections. , While passing through the section while continuing the rotation by the AC power, and after passing through the section, it is forced to rotate by the phase of the AC power of the next feeder substation, and the AC power between the different substations before and after the section If there is a phase difference, the phase difference causes an abnormal torque in the rotating phase converter, causing a problem that the phase converter may fail.

[0009] Not only the phase converter, but also the motor rotating by the single-phase AC stepped down by the main transformer, generates an abnormal torque due to the phase difference of the AC power between the substations before and after passing the section. Then, there is a problem that causes a failure of the blower or the like.

In addition, the winding of the main transformer has sufficient strength, and the load of the phase converter and the motor is smaller than that of the main transformer in terms of load, so that the winding of the main transformer is adversely affected. If a rotating machine relatively large compared to the strength of the windings of the main transformer is connected to the single-phase output of the main transformer, When passing through the section, a phase difference is generated between the current generated from the rotating machine rotating at the phase of the AC power before the section and the current from the train line after passing the section. There is also a problem that an abnormal force is generated between two windings in the transformer, which may cause deformation of the windings and a ground fault.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. When an AC electric vehicle passes through an adjacent feeding section that receives feeding from different substations, each of the preceding and following feeding sections is divided into two sections. Failure of rotating machines such as phase converters, blowers, compressors for air conditioners, single-phase motors, etc., and windings of the main transformer, which can occur due to the phase difference of AC power at the substations It is an object of the present invention to provide a protection device for an AC electric vehicle, which can reliably prevent the deformation of the vehicle and a ground fault accident caused by the deformation.

[0012]

The protection device for an AC electric vehicle according to the present invention is installed on the ground side and receives AC power from different substations. Phase difference detection means for detecting a phase difference of electric power, and a main circuit breaker opened when there is a phase difference which is installed on the ground side and which is larger than the reference value by comparing the phase difference detected by the phase difference detection means with a reference value. A comparison unit that outputs a command, a transmission unit that is installed on the ground side, and transmits a main circuit breaker opening command from the comparison unit to the upper side of the AC electric vehicle, and a transmission unit that is installed on the upper side of the vehicle, and Receiving means for receiving a main circuit breaker opening command, installed on the upper side of the vehicle, and when the receiving means receives the main circuit breaker opening command, before the AC electric vehicle enters another adjacent feeding section, AC power from the substation to the auxiliary circuit Those having a main circuit breaker opening and closing means for performing an opening operation of the main circuit breaker for interrupting the supply.

In the protection device for an AC electric vehicle according to the first aspect of the present invention, when the AC electric vehicle passes through an adjacent feeding section receiving AC power feeding from different substations, a phase difference on the ground side is detected. Means for detecting the phase difference between the AC power from the substations feeding the respective feeder sections, comparing the phase difference with a reference value by comparing means, and when there is a phase difference larger than the reference value, by transmitting means. The main circuit breaker opening command is transmitted to the upper side of the vehicle.

When the receiving means on the upper side of the vehicle receives the main circuit breaker opening command, the main circuit breaker opening / closing means opens the main circuit breaker and closes the auxiliary circuit before the AC electric vehicle enters another adjacent feeding section. Cut off the AC power supply from the substation.

Thus, when an AC electric vehicle passes through an adjacent feeding section where AC power is supplied from different substations, an auxiliary circuit which may be generated due to a phase difference of the AC power of those substations. To prevent failure of rotating machines such as phase converters, blowers, compressors for air conditioners, single-phase motors, deformation of windings of the main transformer, and ground fault accidents associated with them.

According to a second aspect of the present invention, in the protection device for an AC electric vehicle according to the first aspect, the main circuit breaker switching means is connected to the main circuit breaker after the AC electric vehicle enters another adjacent feeding section. By re-starting, the main breaker opened when passing through the feeding section in front of the adjacent feeding section is re-closed after entering another adjacent feeding section, and the AC electric vehicle Can be returned to normal running.

According to a third aspect of the present invention, there is provided an AC electric vehicle protection device installed in each of adjacent first and second feeder sections which receive AC power feed from first and second different substations. A feeder switching breaker, an electric vehicle position detecting means installed on the ground side for detecting the position of the AC electric vehicle, and a position corresponding to the position of the AC electric vehicle installed on the ground side and detected by the electric vehicle position detecting means. A feeder switching unit that controls switching of the feed of AC power from the first and second substations by controlling the opening and closing of the feeder switching circuit breaker; Phase difference detecting means for detecting a phase difference of AC power from the second substation, and a phase difference which is installed on the ground and which is larger than the reference value by comparing the phase difference detected by the phase difference detecting means with a reference value. A comparison means for outputting a main circuit breaker opening command when there is a phase difference, and a ground side Ground-side transmitting means for transmitting a main circuit breaker opening command from the comparing means to the upper side of the vehicle when the AC electric vehicle comes to a predetermined position; and A ground-side receiving means for receiving a command and passing it to the feeder switching means; a vehicle-side receiving means installed on the vehicle side for receiving the main circuit breaker opening command from the ground-side transmitting means; A main circuit breaker opening / closing means for performing an opening operation of a main circuit breaker for interrupting an AC power supply from the substation to an auxiliary circuit when the vehicle side receiving means receives the main circuit breaker opening command; And a vehicle-side transmitting means for transmitting the feeder switching command to the ground side when the main circuit breaker opening / closing means opens the main circuit breaker.

According to the third aspect of the present invention, there is provided an AC electric vehicle protection device, wherein adjacent first and second feeding sections receiving AC power from first and second different substations are connected to the AC electric vehicle. Is switched by the feeder switching means when the AC power passes from the first and second substations. At this time, the phase difference detecting means switches the AC power from the first and second substations. The phase difference of the electric power is detected, and when the comparing means judges that the phase difference is larger than the reference value, the main circuit breaker opening command is outputted, and this is transmitted from the ground side transmitting means to the vehicle side receiving means.

On the upper side of the vehicle, if the upper side receiving means receives the main circuit breaker opening command, the main circuit breaker opening / closing means opens the main circuit breaker to cut off the supply of AC power to the auxiliary circuit from the substation. When the main circuit breaker opening operation is completed, a feeder switching command is transmitted to the ground-side receiving means through the vehicle-side transmitting means. On the ground side, when the ground-side receiving means receives this feeding switching command, it passes the feeding switching command to the power switching means, whereby the feeding switching means performs the power switching operation in the first and second feeding sections.

As described above, when an AC electric vehicle passes through an adjacent feeding section where AC power is supplied from different substations, a phase of an auxiliary circuit which may be generated due to a phase difference of AC power of those substations. Prevents failure of rotating machines such as converters, blowers, compressors for air conditioners, single-phase motors, deformation of windings of main transformers, and ground fault accidents caused by them.

According to a fourth aspect of the present invention, in the protection device for an AC electric vehicle according to the third aspect, the main cutoff is further provided on the ground side through the ground side transmitting means when the feeding switching means switches the feeding power. A main circuit breaker re-closing means for outputting a circuit breaker re-closing command, wherein when the main circuit breaker switching means receives a re-closing command from the main circuit breaker re-closing means through the vehicle upper side receiving means, The main circuit breaker that was opened when the AC electric vehicle passed through the preceding feeding section of the adjacent feeding sections receiving AC power feeding from different substations The AC electric vehicle can be returned to normal running by re-entering after entering another adjacent feeding section.

According to a fifth aspect of the present invention, in the protection device for an AC electric vehicle according to any one of the first to fourth aspects, a ground child is provided on the ground side and a vehicle child is provided on the vehicle upper side for transmitting and receiving signals between the ground side and the vehicle upper side. By installing the substation, it is possible to reliably transmit and receive signals between the AC electric vehicle passing through the adjacent feeding section where the substation is different and the ground side.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention and shows a protection device for an AC electric vehicle in an AC electric railway system having a simple butt-type cross section. In the first embodiment, different substations A
Power lines 1a and 1 supplied from the substation B
b are cross-matched in section 2.
A grounding element 3 is installed at a predetermined ground position at a predetermined distance from the cross section 2.
The vehicle upper child 5 which can communicate with this ground child 3 is installed. In FIG. 1, 6 is a rail, 7 is a train line 1
A pantograph 8 for taking in AC power from the a or 1b into the electric vehicle 4 and a main pantograph 8 for performing a protection operation of turning on / off an auxiliary load circuit for supplying the AC power taken in from the pantograph 7 to the auxiliary load. It is a circuit breaker.

As shown in FIG. 2, the auxiliary circuit 11 is connected to the secondary output winding 13 of the main transformer 12, and generates a three-phase AC auxiliary power supply from a single-phase AC. 14 includes an auxiliary circuit load 15 such as a blower and an air-conditioning compressor driven by receiving the output power of 14, and a single-phase motor 16 driven by a single-phase AC output stepped down by the main transformer 12. The main circuit breaker 8 is provided at a connection between the secondary output winding 13 and the auxiliary circuit 11.

A ground-side controller 9 for transmitting / receiving signals to / from the grounding element 3 monitors the phase of the AC power of each of the trolley lines 1a and 1b that meet each other via the section 2 and detects the phase difference. A power phase difference detection unit 17 for detecting,
The power phase difference between the two substations A and B detected by the power phase difference detection unit 17 is compared with a predetermined reference value, and if there is a phase difference exceeding the reference value, a phase difference for outputting a main circuit breaker operation command is output. The main body breaker operation command output from the phase difference suitability judging unit 18 is transmitted from the ground child (transmitting unit) 3 to the electric vehicle 4.

The electric vehicle 4 is provided with a main circuit breaker switching control unit 10, which receives a main circuit breaker operation command signal transmitted from the ground child 3 via the vehicle child (receiving unit) 5. ,
In order to protect the auxiliary circuit 11 of the electric vehicle 4, the main circuit breaker 8 is opened for a certain period of time, and then the main circuit breaker 8 is turned on again after the electric vehicle 4 passes through the sections 2, and the auxiliary circuit 1
It works to restore 1

Next, the operation of the protection device for an AC electric vehicle having the above configuration will be described with reference to the flowchart of FIG. The power phase difference detection unit 17 of the ground-side controller 9 compares the phases of the AC powers of the substation A and the substation B to determine the difference φ (step S1), and determines whether the phase difference is appropriate or not.
In step 8, the phase difference φ is compared with a reference value ψ (step S2).

In the comparison between the phase difference φ and the reference value ψ, when the phase difference φ is small, the protection operation of the auxiliary circuit 11 is not required, so that the main circuit breaker opening command is not output (step S3), and the phase difference When φ is larger than the reference value ψ, a main circuit breaker opening command is output (step S4).

When the phase difference suitability judging section 18 makes a main circuit breaker opening judgment, a main circuit breaker opening command signal is transmitted from the ground terminal (transmitting section) 3 to the electric vehicle 4. Note that this signal is not output only when the electric vehicle 4 comes close to the ground child 3, but is always output from the ground child 3.

Then, when the electric car 4 advances from right to left in FIG. 1 and comes to the position of the ground child 3,
The upper armature (receiver) 5 receives the main breaker opening command signal sent from the ground arm 3 and passes it to the main breaker opening / closing controller 10 to open the main breaker 8 and operate the auxiliary circuit 11. Protect (step S5).

Thereafter, after the electric vehicle 4 passes through the section 2 in turn, the main circuit breaker switching control unit 10 turns on the main circuit breaker 8 again to recover the auxiliary circuit 11 (step S6).

As described above, in this embodiment, when the phase difference of the AC power is large in the intersection section 2 where the electric power lines 1a and 1b supplied from the different substations A and B meet, the exchange is performed. Auxiliary circuit 1 of AC power stepped down by main transformer 12 by forcibly opening main circuit breaker 8 when electric vehicle 4 passes through section 2
1, phase converter 14, which may be caused by phase differences between substations before and after the section,
Auxiliary circuit load 15 such as blower and compressor, single-phase motor 1
6 and the deformation of the main transformer 12 and the occurrence of a ground fault accident caused by the failure.

In the first embodiment, after the main breaker 8 is opened in a simple butt-type cross section, the cross section 2 is checked by observing the traveling distance of the electric vehicle 4.
When the vehicle passes through the main circuit breaker 8, the main circuit breaker 8 is re-closed. However, a command to re-operate the main circuit breaker 8 is also given from the ground side, as shown by broken lines in FIG. The auxiliary grounding element 15 for transmitting the re-injection command is installed at a position immediately after passing through to the left, the re-injection signal is always transmitted by itself, or the output control of the re-injection signal is performed by the ground side controller 9. can do.

Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4, the protection device for an AC electric vehicle according to the second embodiment is provided with switching circuit breakers 20 a, 20 b alternately connected to train lines 1 a, 1 b supplied from different substations A, B, respectively. Section 2
a and 2b are provided in parallel to perform switching control of these switching circuit breakers 20a and 20b in accordance with the traveling position of the electric vehicle 4, and a phase difference of AC power from each of the substations A and B. A ground-side controller 21 that determines whether the main circuit breaker of the electric vehicle 4 is open in accordance with the size of the electric vehicle 4 and a ground child 22 that transmits and receives signals between the ground-side controller 21 and the electric vehicle 4 are installed on the ground side. ing.

On the electric vehicle 4 side, an on-vehicle child 23 for transmitting and receiving signals to and from the ground child 22 is installed. Also electric car 4
In the second embodiment, the main circuit breaker switching control unit 24 for controlling the switching of the main circuit breaker 8 for protecting the auxiliary circuit 11 confirms the switching state of the main circuit breaker 8 and outputs the switching state signal. To the ground child (transmitter / receiver) through the upper child (transmitter / receiver) 23
22. Therefore, ground child 2
Two-way communication can be performed between the vehicle upper child 23. The configuration of the auxiliary circuit 11 is the same as that of the first embodiment shown in FIG.

The detailed configuration of the ground-side controller 21 will be described with reference to FIG. 5. When the electric vehicle 4 approaches the feeder switching section of the different substations A and B, the electric vehicle 4
Electric vehicle position detecting section 25 for detecting the traveling position of the vehicle, and electric lines 1a and 1b supplied with power from different substations A and B, respectively.
It is necessary to monitor the phase of each AC power and detect the phase difference, and to open the main circuit breaker 8 by comparing the phase difference detected by the phase difference detector 26 with a reference value. And the position of the electric vehicle detected by the electric vehicle position detecting unit 25 and the ground vehicle (transmitter / receiver).
And a feeder switching controller 28 for switching the feeder breakers 20a and 20b based on the main breaker open state signal sent from the vehicle upper side 23 through the feeder 22 to perform feeder switching.

Next, the operation of the protection device for an AC electric vehicle according to the second embodiment having the above configuration will be described. As shown in the flowchart of FIG. 6, in the ground-side controller 21, the power phase difference detection unit 26 always detects the phase difference φ of the AC power of each of the substations A and B, and determines the phase difference φ as the phase difference suitability determination unit 27. (Step S11). The phase difference propriety judging section 27 compares the phase difference φ given from the phase difference detecting section 26 with the reference value ψ (step S12). When the phase difference φ is smaller than the reference value ψ, the main circuit breaker 8 is not opened. Since there is no problem even if the feeder switching control is performed,
In FIG. 4, when the electric car 4 passes through the section 2b from the right to the left, the switching breaker 20b of the substation B is opened by the feeder switching controller 28, and conversely, the switching breaker of the substation A is opened. The control of switching the power system from the substation B to the substation A by turning on the power supply 20a is performed (steps S13 and S14).

However, if the phase difference φ detected by the phase difference detecting section 26 is larger than the reference value ψ, there is a possibility that an abnormality occurs in the auxiliary circuit 11 or the main transformer 12, so that the following steps S15 to S19 Feeding switching control is performed according to the procedure.

First, the phase difference suitability judging section 27 confirms the position of the electric car 4 detected by the electric car position detecting section 25, and when it reaches a fixed point immediately before passing the section 2b (step S15), A breaker opening command is transmitted to the electric vehicle 4 through the ground arm 22 (step S16). On the electric vehicle 4 side, when the upper armature 23 receives this main circuit breaker opening command signal, the main circuit breaker opening / closing control section 24 opens the main circuit breaker 8 and the AC power reduced by the main transformer 12. Is stopped from being supplied to the auxiliary circuit 11 (step S17).

Thereafter, the electric vehicle 4 passes through the section 2b by inertia. At this time, the main circuit breaker opening transmitted from the main circuit breaker opening / closing control unit 24 of the electric vehicle 4 through the vehicle upper arm 23 is opened. When the status signal is received by the ground terminal 22, the feeder switching control unit 28 opens the switching breaker 20b of the substation B and turns on the switching breaker 20a of the substation A, similarly to step S14. Is switched from substation B to substation A (step S18).

When the feeder switching control is completed, a feeder switch completion signal is transmitted from the feeder switch controller 28 to the electric vehicle 4 through the ground arm 22 and received by the upper armature 23. The main circuit breaker switching control section 24 turns on the main circuit breaker 8 again to restore the auxiliary circuit 11 (step S19).

As described above, in the protection device for an AC electric vehicle according to the second embodiment, the trolley lines 1 of the substations A and B are used.
When the electric car 4 passes through the cross sections 2a, 2b in which the switching breakers 20a, 20b are provided in the a, 1b,
When there is a large phase difference between the phases of the AC powers of the different substations A and B, the main circuit breaker 8 is opened and then the feeder system is switched. Failures such as the phase converter 14 of the auxiliary circuit 11, the auxiliary circuit load 15 such as a blower and a compressor, the single-phase motor 16, the deformation of the main transformer 12, and the ground fault accident caused by the failure. Prevention can be surely prevented.

In each of the first and second embodiments, the case where the electric vehicle travels from right to left in FIGS. 2 and 4 has been described. Although the order of operation is reversed between the right side and the left side, opening control of the main circuit breaker 8 is performed in a similar procedure, and control for switching the feeding system is performed.

For transmitting and receiving signals between the ground side and the upper side of the vehicle, a radio transmission / reception technique and an optical transmission / reception technique can be used in addition to the ground transmission and the vehicle transmission.

[0045]

As described above, according to the first aspect of the present invention,
When an AC electric vehicle passes through an adjacent feeding section with a different substation, the phase difference between the AC power from the substation that supplies power to each feeding section on the ground side is compared with a reference value, and is compared with the reference value. When there is a large phase difference, a main circuit breaker opening command is transmitted to the upper side of the vehicle, and the auxiliary circuit is opened by opening the main circuit breaker on the upper side of the vehicle. Failure of rotating machines such as phase converters, blowers, compressors for air conditioners, single-phase motors, etc., and main transformers, which can occur due to the phase difference of AC power at different substations when electric vehicles pass by Of the winding and a ground fault accident resulting therefrom can be reliably prevented.

According to the second aspect of the present invention, in the protection device for an AC electric vehicle according to the first aspect, when the AC electric vehicle enters an adjacent feeding section having a different substation, the main circuit breaker is turned on again. Thus, the main circuit breaker opened just before entering the adjacent feeding section can be turned on again after entering another adjacent feeding section to return to normal traveling.

According to the third aspect of the present invention, when the AC electric vehicle passes through the feeding section of the AC power from the different first and second substations, the AC from the first and second substations is used. The power feeder system is switched on the ground side.
And a phase difference between the AC power from the second substation and a reference value. When the phase difference is greater than the reference value, a main circuit breaker opening command is output to the upper side of the vehicle. When the main circuit breaker opening operation is completed, a feeder switching command is transmitted from the vehicle upper side to the ground side. Since the power supply switching control is performed for the 2 feeder sections,
Auxiliary circuit phase converter, blower, and air conditioning that can be caused by the AC power phase difference between the substations in the front and rear substations when the AC electric vehicle passes through adjacent substations in different substations. Failure of a rotating machine such as a compressor for a machine or a single-phase motor, deformation of a winding of a main transformer, and a ground fault accident caused by the failure can be reliably prevented.

According to a fourth aspect of the present invention, in the protection device for an AC electric vehicle according to the third aspect, the main circuit breaker is turned on again when the feeding switching means is installed on the ground side and the feeding switching control is completed. A main circuit breaker re-injection unit that outputs a command to the upper side of the vehicle is provided, and when the main circuit breaker switching unit receives a re-injection command from the ground side main circuit breaker re-injection unit, the main circuit breaker is re-opened. Therefore, when an AC electric vehicle passes through a different feeder section adjacent to a substation, the main circuit breaker opened while passing through the preceding feeder section enters another feeder section and is then re-input and then turned on. You can return to running.

According to a fifth aspect of the present invention, in the protection device for an AC electric vehicle according to any one of the first to fourth aspects, a grounding element is provided on the ground side and a vehicle is provided on the vehicle side for transmitting and receiving signals between the ground side and the vehicle upper side. By installing the upper child, it is possible to reliably transmit and receive signals between the AC electric vehicle passing through the adjacent feeding section where the substation is different from the ground side by applying the existing technology.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram of the embodiment.

FIG. 3 is a flowchart of opening / closing control of the main circuit breaker according to the embodiment.

FIG. 4 is a circuit block diagram according to a second embodiment of the present invention.

FIG. 5 is a functional block diagram of the embodiment.

FIG. 6 is a flowchart of the opening / closing control of the main circuit breaker according to the embodiment.

[Explanation of symbols]

 Reference Signs List A Substation B Substation 1a, 1b Tram line 2, 2a, 2b Cross section 3 Ground child 4 Electric car 5 Vehicle upper child 6 Rail 7 Pantograph 8 Main circuit breaker 9 Ground side controller 10 Main circuit breaker switching control unit 11 Auxiliary Circuit 12 Main transformer 13 Secondary winding 14 Phase converter 15 Auxiliary circuit load 16 Single-phase motor 17 Power phase difference detector 18 Phase difference suitability judging unit 20a, 20b Switching breaker 21 Ground controller 22 Ground child 23 Car Upper arm 24 Main circuit breaker switching control unit 25 Electric vehicle position detecting unit 26 Power phase difference detecting unit 27 Phase difference suitability judging unit 28 Feeding switching control unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeharu Kudo 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu factory, Toshiba Corporation

Claims (5)

[Claims] 1. A phase difference detecting means installed on the ground side for detecting a phase difference between respective AC powers in adjacent feeding sections receiving AC power feeding from different substations, and installed on the ground side. A comparing means for comparing the phase difference detected by the phase difference detecting means with a reference value and outputting a main circuit breaker opening command when there is a phase difference larger than the reference value; and Transmitting means for transmitting the main circuit breaker opening command to the upper side of the AC electric vehicle, receiving means for receiving the main circuit breaker opening command from the transmitting means, When the receiving means receives the main circuit breaker opening command, before the AC electric vehicle enters another adjacent feeding section, the main circuit breaker for cutting off the AC power supply from the substation to the auxiliary circuit is provided. Main circuit breaker switching for opening operation AC electric vehicle of the protection device comprising a stage. 2. The main circuit breaker switching means re-inputs the main circuit breaker after the AC electric vehicle enters another adjacent feeding section. AC electric car protection device. 3. A feeder switching breaker installed in each of adjacent first and second feeder sections receiving AC power feeder from first and second different substations, and installed on the ground side. An electric vehicle position detecting means for detecting the position of the AC electric vehicle; and an electric vehicle position detecting means installed on the ground side and controlling opening and closing of the feeder switching breaker in accordance with the position of the AC electric vehicle detected by the electric vehicle position detecting means. A feeder switching means for switching and controlling feed of AC power from the first and second substations; and a phase difference between AC power from the first and second substations, which is installed on the ground side. Phase difference detection means for detecting the phase difference detected by the phase difference detection means is compared with a reference value and outputs a main circuit breaker opening command when there is a phase difference larger than the reference value. Comparing means, installed on the ground side, and the A ground-side transmitting means for transmitting a main circuit breaker opening command from the comparing means to the upper side of the vehicle when it comes to the vehicle; Ground-side receiving means to be passed; vehicle-side receiving means installed on the vehicle side to receive the main circuit breaker opening command from the ground-side transmitting means; and vehicle-side receiving means installed on the vehicle side and the vehicle-side receiving means A main circuit breaker opening / closing means for opening a main circuit breaker for interrupting the supply of AC power from the substation to an auxiliary circuit when receiving a circuit breaker opening command; and A protection device for an AC electric vehicle, comprising: vehicle-side transmission means for transmitting the feeder switching command to the ground side when the main circuit breaker is opened. 4. A main circuit breaker re-closing means which is installed on the ground side and outputs a re-closing command of the main circuit breaker through the ground side transmitting means when the power feeding switching means switches the power feeding, 4. The protection of an AC electric vehicle according to claim 3, wherein the main circuit breaker is turned on again when the circuit breaker switching means receives a restart command from the main circuit breaker restart means through the on-vehicle receiving means. apparatus. 5. The exchange according to claim 1, wherein a ground child is installed on the ground side and a vehicle child is installed on the vehicle side for transmitting and receiving signals between the ground side and the vehicle upper side. Electric car protection device.