JP5203664B2 - Trolley wire wear prevention device - Google Patents

Description

The present invention relates to a trolley wire wear prevention device , and more particularly, to a trolley wire wear prevention device for preventing trolley wire wear at an air section.

  Conventionally, a train that travels using DC power can travel by being supplied with electric power from a substation via a train line. In addition, the train line in this specification is a general term for a feeder line configured to allow a large current to flow and a trolley line electrically connected to the feeder line.

The train can obtain power supply via the trolley line by pressing the pantograph on the trolley line. Also, by dividing the train line for each substation, damage is minimized in the event of a failure such as a ground failure . The switching of the train line is performed by an air section, and is performed by the pantograph coming into contact with the other trolley line by the movement of the train that has been fed through the pantograph that is in contact with the one trolley line.

  However, if there is a potential difference between the train lines when switching between the train lines, a large current may flow while the pantograph straddles both trolley lines. In this state, at least one of the trolley lines When the pantograph is in incomplete contact, an arc is generated, the trolley wire is worn, and the trolley wire may be cut.

  Thus, by installing a sign for preventing the train from stopping in the air section, the occurrence of a situation where the trolley wire is worn is prevented. In addition, there are some which are fixed so that the trolley wire is not cut mechanically.

  Furthermore, Japanese Patent Application Laid-Open No. 8-216741 (hereinafter referred to as Patent Document 1) prevents the generation of arc and Joule heat in an air section when a train travels across two divided train lines. For this purpose, a detection sensor for detecting a train traveling in the vicinity of the air section is provided, and when the detection sensor detects that the train is close to the air section, a short circuit is established between the two divided wires. A trolley wire wear prevention device is described.

Japanese Patent Laid-Open No. 8-216741

  However, the method of installing a sign for preventing the train from stopping in the air section may be ineffective due to human factors such as overlooking the sign. In addition, the method of fixing the trolley wire so that the trolley wire is not cut mechanically has a problem that it cannot be used except in a low-speed section such as a garage because the passing speed of the train is limited, and in addition, the trolley wire is worn out. It did not prevent the short-circuit current between the trolley wires that was the cause.

As in Patent Document 1, every time the train approaches the air section, the two feeders are short-circuited in order to eliminate the potential difference in the air section, so that the train passes for a predetermined time each time the train passes. since connecting between the wires, a failure such as ground faults failure disadvantageously expanded its damage in the event of within this time. Further, since the feeder lines are frequently short-circuited, there is a problem that a switch for short-circuiting the feeder lines deteriorates early and the maintenance needs to be performed more frequently.

The present invention has been made taking into account the above-mentioned matters, and an object, it is possible reliably prevent wear of the trolley wire by minimum operation failure such as ground faults a fault has occurred event An object of the present invention is to provide a trolley wire wear prevention device capable of minimizing damage at times.

In order to solve the above-mentioned problems, the present invention provides a first and a second method for measuring a current flowing in an air section respectively attached to a train line located at both ends of an air section that switches between a first train line and a second train line. Input a second current measuring instrument, a thrower connected to the both train lines and capable of switching between an open state and a short-circuit state between the two train lines, and input the measured values of the current and potential difference. And a controller that switches the input device to a short-circuit state when a wear risk condition is feared that the trolley wire is worn, and the wear risk condition is greater than or equal to an auxiliary current threshold value indicating the presence of a train. There is provided a trolley wire wear prevention apparatus characterized by including a condition that a time during which the auxiliary machine current flows reaches a threshold for slow detection .

  According to the trolley wire wear prevention device having the above-described configuration, the feeder only shorts between the two train lines when the measured current value satisfies the wear risk condition and the trolley wire is feared to be worn in the air section. The occurrence of arc can be prevented by eliminating the potential difference in the air section. Conversely, even when the train passes through the air section, if the current measured by the current meter does not satisfy the danger of wear, the thrower will not short-circuit both train lines. Lines can remain separated. The wear risk condition includes at least a condition where the trolley wire is likely to be melted. Preferably, the thrower short-circuits between both train lines under the condition where the wear is feared even if the trolley wire is not melted.

  For example, a thicker feeder wire, a trolley wire electrically connected to the feeder wire, and a feeder suspension-type feeder messenger that suspends the trolley wire can be used for the train wire so that a large current can flow. Not only what is provided, but also a trolley wire without a feeder or messenger. The air section is arranged in parallel without intersecting the first and second train lines, and the first train line is in contact with the pantograph at one end and the second train line is at the other end. In this way, the trolley wire is arranged so as to be inclined in the vertical direction.

  It is preferable that the current measuring device is attached to, for example, two places sandwiching an air section of a trolley wire that contacts a pantograph, and the configuration thereof is, for example, a through-type current transformer provided on a shunt line formed on the trolley wire. preferable. In addition, this current measuring instrument combines a high-speed DC current transformer type detector that accurately measures a small current of the auxiliary machine current and a Hall element type current detector that can measure a large current such as a power running current. It is preferable that the current can be accurately measured from a large current. That is, the sum of the currents flowing on the air section side at both ends of the air section indicates the current flowing in the train in the air section.

  The feeder is preferably provided with a switch circuit that is connected to the feeder line of the first train line and the feeder line of the second train line in the vicinity of the air section and can short-circuit between the feeder lines. Further, the feeder is configured so that the first train line and the second train line can be separated by a signal from the control unit. The feeder is thicker than the trolley wire and is not directly in contact with the pantograph, so it is suitable for connecting a feeder, but it is connected to the trolley wire near the air section. May be. When a feeder is attached to the trolley wire, the potential difference between the two trolley wires can be minimized by switching the feeder to the short-circuit state, so that the generation of arc can be more reliably prevented.

  The control unit determines whether or not a wear risk condition that may cause the trolley wire to be worn in the air section is satisfied using the measured current value, and when the wear risk condition is satisfied, switches the feeder to a short-circuit state. On the other hand, when the train leaves the air section, there is no current flowing in the train line, so that the input device is switched to the open state. In other words, the control unit can accurately control the possibility of trolley wire wear using the measured current value, so that the feeder can be controlled to be in a short-circuit state for the minimum time required to satisfy the wear risk condition. preferable.

Furthermore, the wear concern condition, the current is greater than or equal to the threshold value of the auxiliary current to indicate the presence of a train, and, because it contains a condition that the time of flow of the auxiliary current has reached the threshold of creep detection, auxiliary current Is a train that constantly flows in the train, so that a slow train enters the air section under the condition that the auxiliary current flow continues for a predetermined time or longer, and an arc generated between the trolley line and the pantograph It can be detected that the line is likely to be damaged.

The wear risk condition includes a condition in which the current is equal to or greater than a threshold value of a power running current indicating a power running of a train, and a time integral value of the power running current reaches a heat generation detection threshold value (Claim 2 ). It is possible to detect the high possibility of damaging the trolley wire by estimating the generation of arc heat or Joule heat by time integration of current.

  The wear risk condition is that the absolute values of the currents measured by the first and second current measuring devices are both equal to or greater than a threshold value indicating the presence of a train, and the time during which these currents flow is set to the threshold value of the stay limit time. In a case where the reached condition is included (Claim 3), when the train that has reached the time limit for staying in the air section in the state where the pantograph is straddling the trolley line, the next time the powering current flows, the trolley line and the pantograph It is possible to detect that there is a high possibility that the arc generated between them will wear the trolley wire.

The wear prevention device for the trolley wire includes a potential difference measuring device for measuring a potential difference between both train lines in the air section, and the control unit inputs a measured value of the potential difference, and determines whether or not this satisfies a wear risk condition. And the wear risk condition includes a condition in which the potential difference is equal to or greater than a threshold value indicating the possibility of occurrence of an arc, and a time during which the potential difference equal to or greater than the threshold value occurs reaches a threshold value for arc detection. (Claim 4 ) can detect that there is a high possibility that an arc is generated due to a potential difference generated between the train lines, and can eliminate the potential difference causing the arc generation. If there is a potential difference with the pantograph straddling the two trolley lines, an arc is detected due to incomplete contact between the pantograph and the trolley line. It is possible to eliminate the potential difference that causes the problem.

  The potential difference measuring device, for example, is connected to a trolley line on the first and second train lines, and determines the difference between the ground potentials with the first and second voltage measuring devices that measure the ground potential, respectively. And an arithmetic unit.

When the control unit detects that the potential difference is equal to or greater than a threshold value for detecting occurrence of a failure, the control unit prevents switching of the input device to a short-circuited state (Claim 5 ). In the case where a failure such as a ground failure has occurred in this train line, it is possible to prevent the two train lines from being short-circuited to prevent the failure from expanding.

In the case where the control unit includes condition setting means that can set each of the threshold values and can set a logical expression that combines the conditions as the wear risk condition (Claim 6 ), the threshold value is set. By changing or changing the setting of the combinational logical expression of conditions, it is possible to perform settings that are more realistic.

  The condition setting means is preferably configured by software that can be executed by a computer, and uses the threshold setting data indicating the size of each threshold and the conditional logical expression data indicating the logical expression to determine the wear risk condition. Is preferred. Moreover, it is preferable that the condition setting means includes an interactive setting change program that enables setting change via a touch panel provided in the display device. It is preferable that the logical expression represents a combination of logical product and logical sum of each condition. However, the condition setting means may be hardware provided with input means using a switch, a dial, or the like.

The control unit is connected to a shut-off detector that detects a power supply state to the first train line and the second train line, respectively, and these shut-off detectors are connected to the first train line or the second train line. In the case where the switching to the short-circuit state of the feeder is prevented when detecting the interruption state of the power supply (Claim 8), the power supply to one of the train lines is interrupted due to some failure. In some cases, the failure is prevented from spreading by preventing the switcher from switching to the short-circuit state.

The control unit outputs a sensitivity change setting signal for changing the open condition of the circuit breakers of the first train line and the second train line to a smaller fault current in the short-circuit state of the thrower. In some cases (Claim 9), when a failure such as a ground failure occurs in a state where both train lines are short-circuited by the input device, the fault current that is divided into two train lines flows. In contrast, it is possible to prevent failure expansion by opening the circuit breaker in a sensitive manner.

  As described above, according to the present invention, only when there is a high possibility that the trolley wire is worn out due to the occurrence of arc in the air section, the two train lines are short-circuited by the feeder to cause the arc. Therefore, it is possible to prevent the short-circuit current from flowing through the pantograph, and to prevent the trolley wire from being worn out due to the occurrence of an arc. On the other hand, if the wear risk condition is not satisfied, both train lines remain open even when the train passes through the air section, so that the protection circuit for when a fault current occurs is separated. There is no short circuit between the train lines.

  Since the feeder is configured to be switchable between a short-circuited state and an open-circuited state, even if a large current is interrupted, internal contact deterioration can be reduced. However, the trolley wire wear prevention device of the present invention is subject to wear-out conditions. Since it is configured to short-circuit between the train lines only when is established, the feeder can be used for a longer period of time. That is, it is possible to prevent the trolley wire from being worn with high reliability without frequent maintenance.

  Using the measured current value measured by the current meter, the auxiliary current and powering current are accurately measured, and whether the duration and time integral value exceed the threshold according to the magnitude of the current are at risk of wear. In this case, the train is running slowly in the air section, the power running leading to fusing of the trolley wire, and the state of staying for a long time while straddling the trolley wire Can be detected.

  In addition, the potential difference between the train lines is measured using a potentiometer, and this potential difference is greater than or equal to the threshold at which arcing may occur, and whether the duration of this potential difference exceeds the arc detection threshold In this case, it is possible to accurately detect an arc occurrence possibility and an arc occurrence state in the air section. In other words, since the product of the potential difference and the current is electric power, the amount of heat generated by the generation of an arc between the trolley wire and the pantograph in the air section can be estimated more accurately.

  When the potential difference is equal to or greater than the threshold value for detecting the occurrence of a failure, when switching the switch to the short-circuit state is blocked, or when the switch-circuit is in a short-circuit state, the open condition for the circuit line breaker is opened with less failure current. In such a case, the train line through which the fault current flows can be disconnected from other train lines, so that the failure can be prevented from spreading.

  FIGS. 1-6 is a figure explaining the structure of the wear prevention apparatus 1 of the trolley wire which concerns on embodiment of this invention. As shown in FIG. 1, the trolley wire wear prevention device 1 of the present invention is attached to train lines 2A and 2B located at both ends of an air section 3 for switching between a first train line 2A and a second train line 2B, respectively. The first and second current measuring devices 4A and 4B that measure the currents Ia and Ib that flow through the air section 3 and the potential difference measuring device 5 that measures the potential difference between the two train lines 2A and 2B in the air section 3. And a charging device 6 connected to the both train lines 2A and 2B and capable of switching between an open state and a short circuit state between the both train lines 2A and 2B, and the current measuring devices 4A and 4B, the potential difference measuring device 5, And a control unit 7 connected to the device 6.

  The train lines 2A and 2B in the present embodiment are respectively connected to the substation 8 and feeders 2Ak and 2Bk made of relatively thick conductors routed along the tracks, and feeders 2r that can be appropriately spaced. It includes trolley wires 2At and 2Bt that receive power supply by being electrically connected to 2Ak and 2Bk. The pantograph P of the train T can be supplied with electric power used by the train T by contacting the trolley lines 2A and 2B.

  The air section 3 is arranged in parallel without intersecting the first train line 2A and the second train line 2B, and the first train line 2A at one end 3a and the second train line at the other end 3b. The trolley lines 2At and 2Bt are arranged so as to be inclined in the vertical direction so as to have opposite inclinations so that 2B contacts the pantograph P of the train T.

  The current measuring devices 4A and 4B are attached between the air section 3 from two portions sandwiching the air section 3 of the trolley wires 2At and 2Bt and from the portion connected to the feeder branch line 2r, respectively. . These ammeter measuring instruments 4A and 4B include a branch line 4c branched and connected at the upper two points of the trolley lines 2At and 2Bt, and two through-type current transformers 4d and 4e formed on the branch line 4c. Is provided.

  The two through-type current transformers 4d and 4e are respectively a high-speed DC current transformer type detector that accurately measures a small current such as an auxiliary machine current flowing through the train T, and a power running current that flows when the train T is powered. Hall element type current detector capable of measuring a large current, wherein the current measuring devices 4A and 4B collect the measured values of the through-type current transformers 4d and 4e and are insulated from the train lines 2A and 2B. The measurement value transmitting unit 4f that outputs the value converted into the current in (4) is provided. Note that the currents Ia and Ib to be measured are positive for the current flowing to the air section 3 side.

  The potential difference measuring instrument 5 measures the potential difference V between the trolley wires 2At and 2Bt by being electrically connected to positions outside the air section 3 of the trolley wires 2At and 2Bt, respectively. Since the connecting portion of the potentiometer 5 is outside the air section 3, the connecting portion does not hit the pantograph P, and the potential difference V between the trolley wires 2At and 2Bt can be measured more accurately. It is composed.

  The potential difference measuring device 5 of this embodiment measures the potentials Va and Vb of the trolley wires 2At and 2Bt with reference to the ground, and obtains the difference voltage V by obtaining the difference between both voltages Va and Vb. It is configured so that an accurate potential difference V can be easily obtained. The potential difference measuring device 5 outputs the measured value of the obtained potential difference V as a value converted into a current while being insulated from the trolley wires 2At and 2Bt.

  The feeder 6 is connected to the feeder 2Ak of the first train line 2A and the feeder 2Bk of the second train line 2B in the vicinity of the air section 3, and can be short-circuited between the feeders 2Ak and 2Bk. 6a, a switching actuator 6b for switching the switch circuit 6a between an open state and a short circuit state, and an ammeter 6c for measuring a current Ic flowing through the input device 6. Since the feeder 6 is connected between the feeders 2Ak and 2Bk, a large current can be passed through the feeder 6.

  The control unit 7 is composed of, for example, a programmable logic controller (PLC), inputs the measured values of the currents Ia and Ib and the potential difference V, and satisfies the wear risk condition that the trolley wires 2At and 2Bt are worn in the air section 3. Sometimes, it outputs an intermittent control signal Cnt for switching the input device to a short-circuited state, and includes a display unit 7a that forms an input unit using a touch panel. Note that a button, a keyboard, a mouse, or the like may be provided as the input unit.

  The substation 8 is formed with two systems of circuits for supplying power to the train lines 2A and 2B, and the circuit breakers 10A and 10B for cutting off the power supply to the train lines 2A and 2B. The failure selection devices 11A and 11B that monitor the supplied current and output a breaking signal for breaking the breakers 10A and 10B when an abnormality occurs, and the breaker by communicating with the failure selection devices 11A and 11B from the outside. The communication interruption | blocking apparatus 12A, 12B which interrupts | blocks 10A, 10B is provided. Moreover, the circuit breakers 10A and 10B of this embodiment are provided with circuit break detectors 10c and 10d for detecting the circuit break state.

  FIG. 2 is a diagram showing a configuration of the control unit 7. In FIG. 2, 20 is an interface for inputting measured values such as currents Ia and Ib and potential difference V and outputting a predetermined signal to a device to be controlled, 21 is an arithmetic processing unit connected to this interface 20, 22 Is a memory connected to the arithmetic processing unit 21.

  The interface 20 performs conversion between an analog quantity and a digital signal. Under the control of the arithmetic processing unit 21, the measured values of the currents Ia and Ib from the current measuring devices 4A and 4B and the potential difference V from the potential difference measuring device 5 are used. , Measured values of the breaker detectors 10c, 10d to the breaker 10A, 10B state signal (breaker state Brk or connected state Con), the measured value Ic of the current flowing from the ammeter 6c to the input device 6, various switches And enter the button state. Further, the interface 20 can output an intermittent control signal Cnt for switching the opener 6 to an open state or a short-circuit state, a sensitivity change setting signal Set for the communication breakers 12A and 12B, and signals to various display lamps. It is configured.

  The arithmetic processing unit 21 is connected to the display unit 7a, the interface 20, and the memory 22, and is configured to execute a ladder execution program P1 for reading out and executing a program described by ladder logic from the memory 22. . In addition, since the arithmetic processing unit 21 of the present embodiment is configured to be able to execute a program described by ladder theory, the intermittent control of the input device 6 can be realized by a simple program, but in other languages The described program may be configured to be executable. In this case, the control unit 7 may be a computer that does not function as a PLC.

  The memory 22 is preferably composed of a non-volatile memory. For example, the control program P2 for controlling the input device 6 and changing the setting to the communication interruption devices 12A and 12B, and the wear risk condition used for controlling the input device 6 Is stored, and setting program P3 that can change the setting data D is stored. The memory 22 may be an auxiliary storage device such as a hard disk, a semiconductor memory, or a combination thereof.

  FIG. 3 is a diagram for explaining the operation when the arithmetic processing unit 21 executes the control program P2 and explaining the method for preventing trolley wire wear according to the present invention.

  In FIG. 3, S1 is a step for inputting the currents Ia and Ib, the differential voltage V, and the circuit breaker status signal (Brk / Con). The current flowing in the train T can be expressed as the sum of the currents Ia and Ib. For example, when the currents Ia and Ib are both positive values, is the sum of them satisfying the auxiliary current threshold value? On the other hand, the sum of absolute values of the currents Ia and Ib can be used to determine whether or not the threshold of the powering current is satisfied.

  S2 is a step of calculating a time integral value of the power running current flowing through the train. If no current equal to or greater than the power running current threshold value flows in the air section 3, step S2 sets the time integral value to zero.

  S3 is a step for confirming whether the circuit breakers 10A and 10B are turned on. If both circuit breakers 10A and 10B are both turned on, the next step S4 is executed, and one of the circuit breakers 10A or 10B If 10B is open, the process jumps to step S5.

  S4 is a step for determining whether or not the measured value of the differential voltage V is 500V or less. When the measured value is 500V or less, step S7 is executed next. When the measured value exceeds 500V, step S5 is executed next.

  S5 is a step that is executed when the input device 6 is to be in the open state, and is a step for confirming the state of the input device 6 here. Here, when the thrower 6 is in the open state, the process returns to step S1 and the processes of steps S1 to S5 are repeated. On the other hand, when the thrower 6 is in a short circuit state, the process of the next step S6 is executed.

  S6 is a setting signal for switching the input device 6 to the open state and changing the sensitivity so that when the input device 6 is in the open state, the communication interrupting devices 12A and 12B are set appropriately when the input device 6 is open. This is a step of outputting Set. Specifically, the setting signal Set is output so as to return the threshold value of the fault current whose sensitivity has been changed by the process of step S9 described later. Thereafter, the process jumps to step S1.

  S 7 is a step of reading out the wear risk condition recorded in the setting data D from the memory 22.

  S8 is a step of determining whether or not the measured values of the currents Ia and Ib and the potential difference V satisfy the wear risk condition. If it is determined that the wear risk condition is satisfied, the next step S9 is executed. If it is determined that the wear risk condition is not satisfied, step S10 is executed.

  S9 is a setting for changing the sensitivity so that when the input device 6 is in the short-circuited state, the sensitivity is changed to the communication breaker 12A, 12B after the input device 6 is switched to the short-circuited state. This is a step of outputting a signal Set. Specifically, the failure selection devices 11A and 11B output a setting signal Set for reducing the failure current threshold for outputting a cutoff signal in half.

  S10 is a step of determining whether or not the charging device 6 is in a short circuit state. If the input device 6 is open, the process jumps to step S1. If the input device 6 is short-circuited, the next step S11 is executed.

S11 is a step of determining whether or not the opening condition of the feeder 6 is satisfied. Here, the opening condition of the feeder 6 may be an opening condition set according to the magnitudes of the currents Ia and Ib as will be described later. However, when the opening condition is not particularly set, a risk of wear condition It may be a condition that it is no longer satisfied. When the opening condition of the feeder 6 is not satisfied, the next step S12 is executed, and when the opening condition is satisfied, the process jumps to step S1.

  S12 is a setting signal for switching the input device 6 to the open state and for changing the setting so that when the input device 6 is in the open state, the connection interrupting devices 12A and 12B are changed to an appropriate setting when the input device 6 is opened. Set is output, and the threshold value of the fault current whose setting is changed by the process of step S9 is restored. Then, the process jumps to step S1.

  The series of processes in steps S1 to S12 is performed when the currents Ia and Ib, the measured values of the potential difference V, and the states of the interruptions 10A and 10B satisfy the risk of wear condition included in the setting data D stored in the memory 22. Shows a method of preventing the trolley wire from being short-circuited between the first train line 2A and the second train line 2B.

  FIG. 4 is a diagram showing a screen Sc1 displayed on the display unit 7a by the setting program P3. As shown in FIG. 4, by the operation of the setting program P3, for example, four basic conditions indicating the wear risk of the trolley wires 2At and 2Bt are displayed on the display unit 7a, and the states St1 to St4 of each wear risk condition are displayed. At the same time, numerical data D1 to D8 showing the details of each condition are displayed. B1 is a button for displaying the next condition setting screen, and B2 is a button for reflecting the changed value as a setting value.

  In the example shown in FIG. 4, the first wearable basic condition is the condition that the current in the inflow direction to the air section 3 continues as 10 A or more and 10 seconds or more as the auxiliary current. The condition that the time integral value of the sum of the absolute values of the currents Ia and Ib satisfies 800 A · s, the third basic condition for fear of wear is the condition that the potential difference V is 100 V or more and continues for 10 seconds, the fourth condition It can be seen that the wear risk condition is a condition in which the absolute values of the currents Ia and Ib are both 10 A or more and this continues for 10 seconds.

  Since the display unit 7a forms a touch panel, the setting unit can be changed interactively by touching the portions of the states St1 to St4 and the numerical data D1 to D8.

  FIG. 5 is a diagram showing an example of another screen Sc2 displayed on the display unit 7a when the button B1 shown in FIG. 4 is operated. In FIG. 5, numerals 1 to 4 with numbers 1 to 4 correspond to basic conditions 1 to 4 for fear of wear shown in FIG. 4. In addition, logical expression input keys K5 and K6 composed of “and” and “or” immediately below the keys K1 to K4 are used to set a wear risk basic condition and logical product or logical sum in the numbers next to the keys. Further, on the right side of these logical expression input keys K5 and K6, logical expression input keys K7 and K8 composed of “and” and “or” for assembling a more complicated logical expression and a backspace key K9 Is displayed.

  Therefore, by touching these keys K1 to K9, it is possible to set a logical expression that freely combines the four basic conditions for fear of wear. The logical expression in the middle of input is displayed by the text display F on the right half of the screen Sc2. B3 is a button for saving the logical expression as logical expression data D9, B4 is a button for setting a short-circuit prohibition condition and an opening condition for the input device, and B5 is a button for returning to the screen of FIG.

  FIG. 6 is a diagram illustrating an example of a screen Sc3 displayed on the display unit 7a when the button B4 is operated. As shown in FIG. 6, the display unit 7 a displays two short-circuit prohibition conditions for one input device, one open condition, and states St5 to St7 of these conditions, and specific numerical data D10 to D13. Is displayed. B6 is a button for setting data changed on this screen, and B7 is a button for returning to the screen of FIG.

  That is, the setting can be changed interactively by touching each of the states St5 to St7 and the numerical data D10 to D13 on the screen of FIG.

  As described above, since the arithmetic processing unit 21 executes the setting program P3, the setting values including the setting data D1 to D9 for determining the wear risk condition can be changed. Conditions can be set.

It is a figure which shows the whole structure of the wear prevention apparatus of the trolley wire of this invention. It is a figure which shows the principal part of the wear prevention apparatus of the said trolley wire. It is a figure explaining the wear prevention method of the trolley wire of this invention. It is a figure explaining the example of a setting of the wear-out fear condition of a trolley wire. It is another figure explaining the example of a setting of the said wear-out fear condition. It is a figure explaining operation | movement of the wear prevention apparatus of the said trolley wire.

DESCRIPTION OF SYMBOLS 1 Trolley wire wear prevention device 2A, 2B Train line 3 Air section 4A, 4B Current measuring device 5 Potential difference measuring device 6 Input device 7 Control unit 7a, P3 Condition setting means 10c, 10d Breaking detector Ia, Ib Current D1-D9 Dangerous condition (setting data)
V Potential difference Set Sensitivity change setting signal

Claims (8)

First and second current measuring devices that are respectively attached to the train lines located at both ends of the air section that switches between the first train line and the second train line and that measure the current flowing in the air section;
A thrower connected to the both train lines and capable of switching between an open state and a short-circuit state between the both train lines;
A controller that inputs a measured value of the current and satisfies a wear risk condition in which the trolley wire is worn in the air section; and the wear risk condition includes the current A trolley wire wear prevention apparatus characterized by including a condition that is equal to or greater than a threshold value of an auxiliary machine current indicating the presence of a train and a time during which the auxiliary machine current flows reaches a threshold value of slow detection . 2. The trolley wire according to claim 1, wherein the wear risk condition includes a condition in which the current is equal to or greater than a threshold value of a power running current indicating a power running of a train, and a time integral value of the power running current reaches a threshold value for detecting heat generation. Wear prevention device. The wear risk condition is that the absolute values of the currents measured by the first and second current measuring devices are both equal to or greater than a threshold value indicating the presence of a train, and the time during which these currents flow is set to the threshold value of the stay limit time. The trolley wire wear prevention device according to any one of claims 1 to 2 , including the reached condition. The wear prevention device for the trolley wire includes a potential difference measuring device for measuring a potential difference between both train lines in the air section, and the control unit inputs a measured value of the potential difference, and determines whether or not this satisfies a wear risk condition. The wear risk condition includes a condition in which the potential difference is equal to or greater than a threshold value indicating the possibility of arc occurrence, and a time during which a potential difference equal to or greater than the threshold value has reached a threshold value for arc detection. The trolley wire wear prevention device according to any one of claims 1 to 3 . The trolley wire wear prevention device according to claim 4 , wherein the control unit is configured to prevent the input device from being switched to a short-circuited state when detecting that the potential difference is equal to or greater than a threshold value for detecting occurrence of a failure. . Wherein the control unit is configured can be set each threshold, and, according to any one of claims 1 to 5 comprises a condition setting means it is capable of setting a logical expression of combining the conditions as the wear fear condition Trolley wire wear prevention device. The control unit is connected to a shut-off detector that detects a power supply state to the first train line and the second train line, respectively, and these shut-off detectors are connected to the first train line or the second train line. The trolley wire wear prevention device according to any one of claims 1 to 6 , which prevents switching of the input device to a short-circuited state when detecting a power-off state. The control unit outputs a sensitivity change setting signal for changing the open condition of the circuit breakers of the first train line and the second train line to a smaller fault current in the short-circuit state of the thrower. The trolley wire wear prevention device according to any one of claims 1 to 7 .

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