JP2018038217A - Ground fault detection system of railway vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve compactification of a system in a ground fault detection system of a railway vehicle capable of determining occurrence of a ground fault and a place of its occurrence when a ground fault occurs.SOLUTION: A ground fault detection system of a railway vehicle for detecting occurrence of a ground fault is mounted on an organization comprising a plurality of current collecting units for collecting current, a high voltage circuit driven by power captured by the current collecting units, and a high voltage bus electrically connected to the plurality of current collecting units. Further, the ground fault detection system comprises: a plurality of ammeters (11, 13) for measuring a current flowing through the plurality of current collecting units and a current flowing through the high voltage bus; a ground fault determination unit (24) for detecting occurrence of a ground fault by detecting that at least one of the plurality of ammeters is saturated; and a position determination unit (27) for determining a place of the occurrence of the ground fault based on a direction of the current flowing through the high voltage bus detected by the plurality of ammeters.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a railway vehicle ground fault detection system that detects the occurrence of a ground fault in a railway vehicle.

  In a railway vehicle, electric power collected from an overhead wire is supplied to a high voltage circuit such as a motor drive circuit or a power supply circuit to drive a traveling motor and various electric devices. Usually, one knitting is provided with a plurality of current collectors. “Formation” refers to a configuration in which a plurality of railway vehicles are connected. On the other hand, the plurality of current collectors are electrically connected to each other via a high-voltage bus (also referred to as a “lead-through”). Thereby, even when any of the current collectors is disconnected from the overhead wire, it is possible to prevent a power failure from occurring in a part of the equipment of the knitting, and it is possible to suppress the occurrence of a spark in the current collector.

  In a railway vehicle, although it is very rare, a ground fault may occur in a high-voltage bus or a power line connected to the high-voltage bus. When a ground fault occurs, a very large current flows from the overhead line to the grounding point, and an excessive current is detected at the substation, and the power transmission is immediately cut off. Therefore, the power supply to the knitting is cut off. Therefore, the power supply to all the trains connected to the same overhead line is stopped due to the ground fault.

  When the above-mentioned ground fault occurs, in each knitting, all the current collectors are once disconnected from the overhead wire. In addition, at the substation, power is automatically turned on again. Therefore, the driver of each organization connects each current collector to the overhead line one by one in order, and checks again whether a ground fault occurs. The driver can identify the location where the ground fault has occurred in which knitting by repeatedly performing such an operation.

  However, since a plurality of current collectors are connected to the overhead wire per one formation, it is difficult to find a short-circuit portion by a single operation. For this reason, ground faults are generated many times in the process of confirmation work, and if the interruption of power transmission and the reapplying of power are repeated many times at the substation, the circuit breaker of the substation will burn out. There was a risk of occurrence. If a problem spreads to a substation, it will be very difficult to restore normal operation in a short time.

  Further, as prior art related to the present invention, in paragraphs 0043-0051 of Patent Document 1, occurrence of a ground fault is determined based on the input current from the current collector, and the direction of the current flowing through the bus bar A system for estimating the point of failure is shown.

JP 2012-223020 A

As in the system of Patent Document 1, when a ground fault occurs, it is possible to determine the occurrence of a ground fault and estimate the location of occurrence by detecting the current flowing through the current collector and the current flowing through the bus. it can. Further, by increasing the number of current breakers and ammeters installed on the busbars, it is possible to more precisely identify and disconnect the location where the ground fault occurs.
However, since the ground fault current is very large, the size of the ammeter for measuring the ground fault current becomes very large. Therefore, in the system of Patent Document 1, a plurality of large ammeters are mounted on one railway vehicle, and there is a problem that it is difficult to secure a system arrangement space in the railway vehicle.

  An object of the present invention is to make the system compact in a ground fault detection system for a railway vehicle that can determine the occurrence and location of a ground fault when a ground fault occurs.

In order to achieve the above object, the present invention
Mounted on a knitting comprising a plurality of current collectors for collecting current, a high voltage circuit driven by the power taken in by the current collector, and a high-voltage bus bar electrically connected to the plurality of current collectors In a railway vehicle ground fault detection system that detects the occurrence of a ground fault,
A plurality of ammeters for measuring a current flowing through the plurality of current collectors and a current flowing through the high-voltage bus;
A ground fault determination unit that detects that at least one of the plurality of ammeters is saturated and determines the occurrence of a ground fault;
A position determination unit that determines a location where a ground fault occurs based on a direction of current flowing through the high-voltage bus detected by the plurality of ammeters;
It is characterized by having.

  According to this configuration, since the ground fault determination unit detects that the ammeter is saturated and determines the occurrence of the ground fault, the ammeter is not a large-sized ammeter that can measure the ground fault current, but the ground fault. A small ammeter that saturates with current can be used. Therefore, the total volume of a plurality of ammeters mounted on one railway vehicle can be reduced. Therefore, it is possible to determine the occurrence of a ground fault and the location where the fault has occurred, and to make the system compact.

Preferably, it comprises a plurality of voltmeters that respectively measure the voltages of the plurality of current collectors,
The ground fault determination unit may determine the occurrence of a ground fault based on the fact that at least one of the plurality of ammeters is saturated and the measurement of the plurality of voltmeters.
When a ground fault occurs, the voltage at the current collector becomes zero due to a ground fault current or due to a power transmission interruption at a substation. According to the above configuration, when the ammeter is saturated due to a factor other than the ground fault, it can be determined from the measurement result of the voltmeter that no ground fault has occurred. Therefore, the size of the ammeter can be further reduced as much as erroneous detection of a ground fault is avoided.

More preferably, the ground fault determination unit may be configured to determine that no ground fault has occurred when an idling detection signal indicating that the wheel of the formation has slipped is input.
When idling occurs, a large current temporarily flows in the high voltage circuit, and the ammeter may be saturated. However, according to the above configuration, it can be determined that a ground fault has not occurred due to the idling detection signal. Therefore, the size of the ammeter can be further reduced as much as erroneous detection of a ground fault is avoided.

Here, the ground fault detection system for a railway vehicle according to the present invention includes a voltmeter and an ammeter mounted on one railway vehicle among the plurality of voltmeters and the plurality of ammeters, the ground fault determination unit, and The position determination unit may be a single unit.
According to this configuration, the workability of attaching the ground fault detection system to the railway vehicle is improved.
Each of the plurality of ammeters may be a current transformer.
According to this configuration, the ground fault current can be detected based on the output saturation with a small-sized ammeter.

Furthermore, the railway vehicle ground fault detection system according to the present invention may further include a learning unit that adjusts a determination condition for occurrence of a ground fault.
According to this configuration, the determination of the occurrence of ground fault is performed by the learning unit, and the determination of the occurrence of ground fault can be made with higher accuracy.

  According to the ground fault detection system for a railway vehicle of the present invention, it is possible to determine the occurrence of a ground fault and the location where the fault has occurred when the ground fault occurs, and it is possible to make the system compact.

It is a lineblock diagram showing the ground fault detection system concerning a 1st embodiment of the present invention. It is a block diagram which shows the logic part of the ground fault detection system which concerns on 1st Embodiment. It is a graph which shows the output characteristic of a panta point ammeter. It is a block diagram which shows the ground fault detection system of 2nd Embodiment of this invention. It is a block diagram which shows the logic part of the ground fault detection system which concerns on 2nd Embodiment. It is a block diagram which shows the logic part of the ground fault detection system which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a configuration diagram illustrating a ground fault detection system according to a first embodiment of the present invention. FIG. 2 is a configuration diagram illustrating a logic unit of the ground fault detection system according to the first embodiment.

  The railway vehicle ground fault detection system of the present embodiment is a system that is mounted on one train and detects the occurrence of a ground fault. “Formation” indicates a configuration in which a plurality of railway vehicles are connected. The plurality of railway vehicles M constituting one train includes a railway vehicle M on which the current collector 1 is mounted and a railway vehicle M on which the current collector 1 is not mounted. The current collector 1 is, for example, a pantograph. The railway vehicle M on which the current collector 1 is mounted is equipped with a power line 1A, a ground fault detection unit 2, and a VVVF inverter 4 that is a high voltage circuit. A certain SIV5 is installed. The power line 1 </ b> A supplies power from the current collector 1 to a VVVF (Variable Voltage Variable Frequency) inverter 4 and a SIV (Static Inverter) 5.

  For knitting, one high-voltage bus 3 laid over a plurality of railway vehicles M is provided. The high-voltage bus 3 is connected to the power line 1 </ b> A of each current collector 1. A plurality of current collectors 1 are electrically connected by the high-voltage bus 3, so that it is possible to avoid a situation in which some of the high-voltage circuits fail when one of the current collectors 1 is disconnected from the overhead line. . Furthermore, the occurrence of sparks when the current collector 1 is disconnected from the overhead wire or reconnected is suppressed.

The VVVF inverter 4 converts the power supplied via the power line 1A and outputs it to the traveling motor. Further, the VVVF inverter 4 detects when the wheel of the railway vehicle slips and outputs a slip detection signal. When the wheel idles, an excessive current flows through the VVVF inverter 4, so that control is performed to reduce the output of the VVVF inverter 4 based on the idling detection signal.
The SIV 5 converts the electric power supplied via the power line 1A and outputs it to various electric components of the railway vehicle M.

Next, the ground fault detection system will be described.
The ground fault detection system is configured by connecting a plurality of ground fault detection units 2 to each other via signal lines. The local fault detection unit 2 includes a panta point ammeter 11, a current breaker 12, and a cross current ammeter 13, and each of these elements is housed in a single casing to form a unit. At least one of the plurality of ground fault detection units 2 is provided with the logic unit 20 of FIG. Note that the cross current ammeter 13 may be omitted in the railway vehicle M that does not require cross current measurement. The local fault detection unit 2 is mounted on a plurality of railway vehicles M having the current collector 1, and is fixed to the lower part of the vehicle, for example. Here, the panta point ammeter 11 and the cross current ammeter 13 correspond to the ammeter according to the present invention.

FIG. 3 is a graph showing the output characteristics of the panta-point ammeter.
The panta point ammeter 11 is attached to the power line 1 </ b> A of the current collector 1 and measures its current. The panta point ammeter 11 is, for example, a current transformer (CT). As shown in the output characteristics of FIG. 3, the panta-point ammeter 11 is not a large-capacity ammeter that can measure the ground fault current, but a small-capacity current that saturates when the ground fault current flows through the power line 1A. It is a total. However, the size is selected so as to saturate at a current sufficiently larger than the overall maximum current consumption of the VVVF inverter 4 and SIV5.

A saturation detector 21 (see FIG. 2) for detecting that the output has been saturated is provided at the output unit of the panta-point ammeter 11. The saturation detection unit 21 outputs a binary signal indicating whether or not the output is saturated. The saturation detection unit 21 can be configured by, for example, a comparator that compares the output of the pantograph ammeter 11 with the saturation threshold Lth (see FIG. 3).
The circuit breaker 12 is a bus line breaker (BLB), and is provided at a connection portion between the power line 1 </ b> A of the current collector 1 and the high voltage bus 3. The current breaker 12 is switched between a connected state and a disconnected state based on a signal from the cab.

The cross current ammeter 13 is attached around the breaker 12 of the high voltage bus 3 and measures the current flowing through the high voltage bus 3. The cross current ammeter 13 is, for example, a current transformer (CT). The cross current ammeter 13 only needs to be able to measure the direction of the current flowing through the high voltage bus 3 when a ground fault occurs. For example, an ammeter having a current capacity similar to that of the punter current type 11 is employed.
A direction detector 22 that detects the positive / negative of the output of the cross current ammeter 13 is provided at the output portion of the cross current ammeter 13. The direction detection unit 22 outputs a binary signal indicating the current direction.

As shown in FIG. 2, the logic unit 20 includes a ground fault determination unit 24 that determines the occurrence of a ground fault, a position determination unit 27 that determines a location where a ground fault occurs, and the occurrence and occurrence of a ground fault when a ground fault occurs. And an output circuit 28 for outputting information on the location to the cab or the like.
The ground fault determination unit 24 is an OR gate, and outputs a signal indicating the occurrence of a ground fault when the signals of the plurality of saturation detection units 21 are input and at least one of the plurality of punter point ammeters 11 is saturated. .

  The position determination unit 27 is a logic circuit that performs a predetermined logical operation, specifies a location where a ground fault has occurred based on signals from the plurality of direction detection units 22, and outputs a signal representing the location. For example, a description will be given of a knitting in which two cross current meters 13 are provided in the railway car M of the fifth car and the eighth car (see FIG. 1), with the first car as the head and the tenth car as the tail. In this case, if both the current directions of the two cross current ammeters 13 are detected as being forward, the position determination unit 27 determines that a ground fault has occurred in the leading power system block U1. Further, if the current direction is detected as backward in the fifth car and detected as forward in the eighth car, the position determination unit 27 determines that a ground fault has occurred in the intermediate power system block U2. If both current directions are detected as being backward, the position determination unit 27 determines that a ground fault has occurred in the rear power system block U3. The position determination unit 27 performs a predetermined logical operation in this way and outputs a signal of the operation result.

  In FIG. 1, the arrangement and the number of the cross current ammeters 13 and the power system blocks U1 to U3 that can be identified as the occurrence points of the ground fault are shown in a simplified manner. Actually, more cross current ammeters 13 are provided, so that a more accurate determination of a ground fault occurrence location is performed. For example, the cross current ammeter 13 may be further provided in the ground fault detection unit 2 of the third car. Further, the cross current ammeter 13 may be further provided on the high voltage bus 3 on the rear side of the breaker 12 in the ground fault detection unit 2 of the fifth car. In this case, the occurrence location of the ground fault can be identified in more detail based on the current directions of the four cross current ammeters 13.

  When the ground fault occurrence signal is output from the ground fault determination unit 24, the output circuit 28 holds the ground fault generation signal and the signal indicating the location of the position determination unit 27, and sends the held signal to the crew cabin. Output. With this output, a ground fault occurrence display and a display indicating the ground fault occurrence location are displayed on the cab of the crew cabin, and these are notified to the crew.

<Ground fault detection operation>
Next, the detection operation when a ground fault occurs will be described.
During normal operation of knitting, the current collected by the current collector 1 and flowing through the power line 1A is less than the total maximum current consumption of the VVVF inverter 4 and SIV5. Therefore, the outputs of the plurality of panta-point ammeters 11 do not saturate, and the ground fault determination unit 24 does not determine whether a ground fault has occurred.
On the other hand, when a ground fault occurs in the power system in the train, a large ground fault current flows from the overhead line toward the ground fault point. Therefore, at least one output of the plurality of panta-point ammeters 11 is saturated. Then, a detection signal is output from at least one saturation detection unit 21 (see FIG. 2), and thereby a ground fault generation signal is output from the ground fault determination unit 24.

When a ground fault occurs, a ground fault current flows toward the ground fault point also in the high-voltage bus 3, and the direction of this current is measured by the cross current ammeter 13. Then, these current direction detection signals are input to the position determination unit 27. Then, a predetermined logical operation is performed, and a signal indicating a ground fault occurrence location is output from the position determination unit 27.
When the ground fault generation signal and the signal of the occurrence location are output, the output circuit 28 holds these signals and outputs them to the cab.

  As described above, according to the ground fault detection system of the first embodiment, when a ground fault occurs in the knitting due to the measurement by the panta point ammeter 11 and the cross current ammeter 13, The occurrence location can be determined. Furthermore, since the panta point ammeter 11 is a small capacity ammeter whose output is saturated when a ground fault current flows through the power line 1A, the size of the panta point ammeter 11 can be greatly reduced. Similarly, the cross current ammeter 13 may be a small ammeter. Therefore, the ground fault detection unit 2 can be downsized, and the entire system can be downsized.

  Further, according to the ground fault detection system of the first embodiment, the determination of the occurrence of the ground fault and the determination of the occurrence location can be realized by a simple logical operation using a binary signal. Therefore, the logic unit 20 can be configured by a simple logic circuit.

(Second Embodiment)
FIG. 4 is a block diagram showing a ground fault detection system according to the second embodiment of the present invention. FIG. 5 is a configuration diagram illustrating a logic unit of the ground fault detection system according to the second embodiment.
The ground fault detection system of the second embodiment is obtained by changing a part of the determination condition for the occurrence of ground fault, and the other configuration is the same as that of the first embodiment. About the same structure, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

As shown in FIG. 4, the local fault detection unit 2 of the second embodiment includes a panta point voltmeter 14 in addition to the configuration of the first embodiment. The panta point voltmeter 14 is, for example, a direct current potential transformer (DCPT) and measures a voltage between the power line 1A of the current collector 1 and the ground potential.
As shown in FIG. 5, a low voltage detection unit 23 is provided at the output unit of the panta point voltmeter 14. The low voltage detection unit 23 detects whether or not the voltage of the power line 1A is a low voltage that has decreased due to a ground fault, and outputs a binary signal indicating the detection result. Alternatively, the low voltage detection unit 23 may be configured to detect whether it is an overhead line voltage when power transmission is interrupted at the substation due to the occurrence of a ground fault, and to output a binary signal indicating the detection result. .

  In the second embodiment, the logic unit 20A of the ground fault detection system includes a ground fault determination unit 24A as shown in FIG. The ground fault determination unit 24 </ b> A includes an OR gate 25 that inputs signals of the plurality of saturation detection units 21 and outputs a logical sum, and an AND gate 26.

  The AND gate 26 receives the output of the OR gate 25, the outputs of the plurality of low voltage detectors 23, and the inverted signal of the idling detection signal, and calculates the logical product of these to indicate whether or not a ground fault has occurred. Output a signal. The idling detection signal is a signal indicating that the wheel of the railway vehicle M has idled as described above, and is output from the VVVF inverter 4.

  The panta point ammeter 11 of the second embodiment may employ a smaller capacity than that of the first embodiment. For example, the output saturation level of the panta-point ammeter 11 may be equal to or lower than the total maximum current consumption of the VVVF inverter 4 and SIV5.

<Ground fault detection operation>
Also in the second embodiment, during normal operation of the knitting, the current flowing from the current collector 1 through the power line 1A is significantly lower than the overall maximum current consumption of the VVVF inverter 4 and SIV5, and a plurality of panta-point ammeters The output of 11 is not saturated. Therefore, the output value of the OR gate 25 is “0”, the output value of the AND gate 26 is “0”, and the ground fault determination unit 24A does not output a signal indicating the occurrence of a ground fault.

  In addition, when the train is idling and a large current flows temporarily to the VVVF inverter 4 during the knitting operation, if the saturation level of the panta-point ammeter 11 is low, any saturation detection unit 21 is caused by this large current. May output a signal indicating saturation. However, even in this case, the inverted signal (output value “0”) of the idling detection signal is input to the AND gate 26. Therefore, the output value of the AND gate 26 is “0”, and the ground fault determination unit 24A does not output a ground fault occurrence signal.

  In addition, when there is a disconnection and reconnection of the current collector 1 from the overhead line during knitting operation, and a rush current flows from the overhead line to the VVVF inverter 4 or SIV 5, the saturation level of the panta-point ammeter 11 is If it is low, a signal indicating saturation may be output from any of the saturation detectors 21. Alternatively, when the current consumption of the VVVF inverter 4 and SIV5 becomes very large, if the saturation level of the pantograph ammeter 11 is low, a signal indicating saturation may be output from one of the saturation detectors 21. is there. However, in these cases, since a high voltage is applied to the overhead wire, the output values of the plurality of low voltage detection units 23 are “0”. Therefore, even if the output value of the OR gate 25 becomes “1”, the output value of the AND gate becomes “0”, and the ground fault determination unit 24A does not determine the occurrence of the ground fault.

  On the other hand, when a ground fault occurs in the knitting, a large ground fault current flows from the overhead line toward the ground fault point. Accordingly, at least one output of the plurality of punter point ammeters 11 is saturated, and the output value of the OR gate 25 becomes “1”. At this time, since the wheel does not slip, the value of the inversion signal of the slip detection signal is also “1”. Further, the overhead line voltage decreases due to the ground fault, and the output values of the plurality of low voltage detection units 23 become “1”. Therefore, the output value of the AND gate is “1”, and a ground fault occurrence signal is output from the ground fault determination unit 24A. Thus, the output circuit 28 outputs a ground fault generation signal and a generation location signal to the cab.

  As described above, according to the ground fault detection system of the second embodiment, even when the voltage of the current collector 1 is measured by the panta point voltmeter 14 and the output of the panta point ammeter 11 is saturated, the current collector When the voltage of 1 is not a low voltage indicating a ground fault, the occurrence of the ground fault is not determined. Accordingly, it is possible to prevent erroneous determination of occurrence of a ground fault, and accordingly, a smaller ammeter can be employed as the panta point ammeter 11. Therefore, the ground fault detection unit 2 can be made more compact.

  Further, according to the ground fault detection system of the second embodiment, since all signals for determining the occurrence of ground fault are binary signals, the logic unit 20A can be configured by a simple logic circuit.

(Third embodiment)
FIG. 6 is a configuration diagram illustrating a logic unit of the ground fault detection system according to the third embodiment.
In the ground fault detection system according to the third embodiment, the learning unit 31 can appropriately adjust the detection condition of the saturation detection unit 21, the detection condition of the direction detection unit 22, and the detection condition of the low voltage detection unit 23. Hereinafter, detailed description of the same configuration as that of the second embodiment will be omitted.
In the third embodiment, the saturation detection unit 21, the direction detection unit 22, and the low voltage detection unit 23 are configured such that each detection condition can be set in detail using a plurality of setting parameters. For example, various parameters such as a detection level, a signal change amount, a signal change rate, a signal change timing, and a signal change pattern may be adopted as detection condition setting parameters.

The learning unit 31 is configured to operate in, for example, a ground fault field test. In the ground fault field test, ground faults are actually generated in various patterns to test whether the ground fault detection system can correctly determine the occurrence of the ground fault. Alternatively, various patterns of situations that are likely to be erroneously determined as ground faults are generated, and the ground fault detection system is tested for erroneous determination as a ground fault occurrence.
The learning unit 31 inputs the test result information and the signal of the occurrence of the ground fault and the occurrence location as the determination result of the logic unit 20A from the outside. The learning unit 31 can determine whether the logic unit 20A has made a correct determination or an incorrect determination by comparing both pieces of information.

Further, the learning unit 31 inputs the outputs of the respective panta point ammeters 11, the respective cross current ammeters 13, and the respective panta point voltmeters 14, and when the correct determination is made, these outputs have no regularity. Or search processing. In addition, when an erroneous determination is made, the learning unit 31 performs a search process for whether there is regularity in these outputs.
As a result of the search process, the learning unit 31 can reduce the misjudgment and realize the correct judgment from the regularity when the misjudgment is performed and the regularity when the correct judgment is performed. 21, each detection condition of the direction detection unit 22 and the low voltage detection unit 23 is extracted. And according to each detection condition, the value of the setting parameter of the saturation detection part 21, the direction detection part 22, and the low voltage detection part 23 is corrected.

By correcting the setting parameters in this way, it is possible to correct the operation of the ground fault detection system so that erroneous determination of ground faults by the ground fault detection system is reduced and the determination of ground faults is performed reliably and accurately.
As described above, according to the ground fault detection system of the third embodiment, since a reliable and accurate determination of the ground fault can be performed, the panta point ammeter 11, the cross current ammeter 13, and the punter point voltmeter 14 are accordingly provided. It becomes possible to apply a smaller measuring instrument. Therefore, the system can be made more compact.

  In addition, you may comprise the learning part 31 not to operate | move in a ground fault test, but to operate | move during the normal operation | movement of a organization. In this case, when it is determined that a ground fault has occurred, the learning unit 31 may be configured to give information about whether the determination is a normal determination or an incorrect determination to the learning unit 31 from the worker. In addition, the learning unit 31 does not correct the detection conditions of the saturation detection unit 21, the direction detection unit 22, and the low voltage detection unit 23, but, for example, the ground fault determination unit 24A or the logical determination condition of the position determination unit 27 You may comprise so that it may correct. In this case, the logic determination conditions between the ground fault determination unit 24A and the position determination unit 27 can be set in more detail including, for example, signal generation order and delay conditions, and the learning unit 31 The configuration may be such that these parameters are appropriately corrected.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the configuration in which the logic units 20 and 20A are accommodated in one ground fault detection unit 2 is shown. However, for example, the logic unit 20 is provided in the cab and is connected to the local fault detection unit 2 and the signal line. It is good also as a structure connected. Moreover, in the said embodiment, although the united structure which accommodated the panta point ammeter 11 and the cross current ammeter 13 in the same housing | casing as the circuit breaker 12 was shown, even if these were separately mounted in a rail vehicle. Good. In the above embodiment, the configuration in which the occurrence of the ground fault is determined based on the saturation of the pantograph ammeter is shown. However, the generation of the ground fault is determined based on the saturation of the cross current ammeter. May be. In addition, the details shown in the embodiments can be changed as appropriate without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Current collecting part 1A power line 2 Ground fault detection unit 3 High voltage bus 4 VVVF inverter 5 SIV
11 Panta-point ammeter (ammeter)
13 Cross current meter (Ammeter)
14 Punta point voltmeter (voltmeter)
20, 20A Logic unit 21 Saturation detection unit 22 Direction detection unit 23 Low voltage detection unit 24, 24A Ground fault determination unit 25 OR gate 26 AND gate 27 Position determination unit 28 Output circuit 31 Learning unit

Claims (6)

Mounted on a knitting comprising a plurality of current collectors for collecting current, a high voltage circuit driven by the power taken in by the current collector, and a high-voltage bus bar electrically connected to the plurality of current collectors In a railway vehicle ground fault detection system that detects the occurrence of a ground fault,
A plurality of ammeters for measuring a current flowing through the plurality of current collectors and a current flowing through the high-voltage bus;
A ground fault determination unit that detects that at least one of the plurality of ammeters is saturated and determines the occurrence of a ground fault;
A position determination unit that determines a location where a ground fault occurs based on a direction of current flowing through the high-voltage bus detected by the plurality of ammeters;
A ground fault detection system for a railway vehicle, comprising: A plurality of voltmeters for measuring the voltages of the plurality of current collectors,
The ground fault determination unit determines occurrence of a ground fault based on at least one of the plurality of ammeters being saturated and measurement of the plurality of voltmeters. Railway vehicle ground fault detection system.   The ground fault of the railway vehicle according to claim 2, wherein the ground fault determination unit determines that a ground fault has not occurred when an idling detection signal indicating that the wheel of the train has slipped is input. Detection system.   The voltmeter and ammeter mounted on one railway vehicle among the plurality of voltmeters and the plurality of ammeters, the ground fault determination unit, and the position determination unit are unitized. The ground fault detection system for a railway vehicle according to claim 2 or 3.   5. The railway vehicle ground fault detection system according to claim 1, wherein each of the plurality of ammeters is a current transformer. 6.   The railway vehicle ground fault detection system according to any one of claims 1 to 5, further comprising a learning unit that adjusts a determination condition for occurrence of a ground fault.

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