CN211670626U - Subway rail potential limiting device - Google Patents
Subway rail potential limiting device Download PDFInfo
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- CN211670626U CN211670626U CN201922090652.XU CN201922090652U CN211670626U CN 211670626 U CN211670626 U CN 211670626U CN 201922090652 U CN201922090652 U CN 201922090652U CN 211670626 U CN211670626 U CN 211670626U
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Abstract
The utility model provides a subway steel rail potential limiting device, wherein one end of an RC circuit module is connected with a steel rail, and the other end is connected with one end of a current measuring module; the other end of the current measuring module is connected with the ground through a parallel circuit of the contactor switch module and the bidirectional thyristor module; the voltage measuring module is arranged in parallel with the contactor switch module; the control module is respectively connected with the current measuring module, the voltage measuring module, the contactor switch module and the bidirectional thyristor module. The circuit can effectively solve the problem of peak voltage generated when the conventional steel rail potential limiting device is disconnected, can obviously reduce the times of misoperation of the device, can effectively reduce leakage of stray current, and can reduce the steel rail potential.
Description
Technical Field
The utility model belongs to the technical field of rail potential suppression, specifically a subway steel rail potential limiting device.
Background
The subway adopts direct current as traction power, a traction substation supplies power to a locomotive through a contact net, and the current flows back to the substation through a steel rail. At the initial stage of subway operation, the insulating properties of insulating fastener between rail and the railway roadbed is better, but with the time lapse, the insulating properties of insulating fastener can descend gradually, and the electric current flows through insulating pad, gauge block and soft sleeper and leaks to the underground, forms stray current. Can produce a potential difference between rail and the ground, if the rail potential is too high, can cause the threat to subway staff and passenger's personal safety, and the stray current of revealing can corrode the structural reinforcement of tunnel and nearby metal pipeline etc. for natural corrosion, stray current's corrosion rate will be a lot of fast. Therefore, in order to prevent the rail potential from being too high and to collect stray currents in the ground, a rail potential limiting device (OVPD) and a drainage cabinet are installed in the reflux system.
Rail potential limiting device (OVPD) adopts the mode with subway track and earth short circuit to reduce the rail potential, but in actual conditions, because the problem of rail self capacitance and inductance, when the device breaks off at every turn, a peak voltage may appear in the circuit, the voltage and the current detection module of device are after testing the signal, again control contactor is closed, lead to the device short circuit once more, and the short circuit of device at every turn can cause a large amount of stray current to reveal, can lead to the fact the corruption to nearby metal pipeline.
Therefore, the problem of the spike voltage when the rail potential limiting device is disconnected is not solved at present, and the rail potential limiting device (OVPD) still may have malfunction.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a subway steel rail potential limiting device, this circuit can effectively solve the peak voltage's that current rail potential limiting device produced when the disconnection problem, simultaneously, can show the number of times that reducing mechanism takes place the malfunction, can effectively reduce stray current's revealing to can reduce the rail potential.
In order to achieve the above object, the utility model provides a subway steel rail potential limiting device, which comprises an RC circuit module, a current measuring module, a voltage measuring module, a contactor switch module, a bidirectional thyristor module and a control module;
one end of the RC circuit module is connected with the steel rail, and the other end of the RC circuit module is connected with one end of the current measuring module and used for eliminating peak voltage;
the other end of the current measuring module is connected with the ground through a parallel circuit of the contactor switch module and the bidirectional thyristor module, and is used for detecting the magnitude of a flowing current value in real time and sending the detected current value to the control module in real time;
the voltage measuring module is arranged in parallel with the contactor switch module and is used for detecting the voltage value between the steel rail and the ground in real time and sending the detected voltage value to the control module in real time;
the control module is used for controlling the contactor switch module to pull in the short circuit to lead current to the ground when the detected voltage value exceeds a set value A, and is used for controlling the contactor switch module to be disconnected when the detected current value is lower than a set value C; the bidirectional thyristor control circuit is used for controlling the bidirectional thyristor module to be conducted and controlling the contactor switch module to pull in the short circuit to lead current to the ground when the detected voltage value exceeds a set value B, and is used for controlling the contactor switch module to be disconnected and controlling the bidirectional thyristor module to be disconnected when the detected current value is lower than a set value C; the set value B is larger than the set value A.
Preferably, the RC circuit module comprises a resistor R9, a capacitor C3 and a diode D2, wherein one end of a branch of the resistor R9 connected in parallel with the capacitor C3 is connected to the steel rail, and the other end of the branch is connected to the anode of the diode D2.
Preferably, the current measuring module includes resistors R1 to R5, an amplifier U1 and a comparator U2, one end of the resistor R1 and one end of the resistor R2 are connected and then connected to a cathode of a diode D2, the other end of the resistor R2 is connected to an input pin 1 of the amplifier U1, an input pin 2 of the amplifier U1 is connected to one end of the resistor R3, a cathode of a diode D2 and a ground, an output pin 3 of the amplifier U1 is connected to the other end of the resistor R3 and an input pin 1 of the comparator U2, an input pin 2 of the comparator U2 is connected to the ground and one end of the resistor R4, the other end of the resistor R4 is connected to a power source VCC, and an output pin 3 of the comparator U2 is connected to the power source VCC through a resistor R5;
the voltage measurement module comprises resistors R6-R8, an amplifier U3 and a diode D1, wherein an input pin 1 of the amplifier U3 is connected with the ground, an input pin 2 of the amplifier U3 is connected with the other end of a resistor R1 through a resistor R6, an output pin 3 of the amplifier U3 is connected with one end of a resistor R8, the other end of the resistor R8 is connected with an input pin 2 of the amplifier U3 through a branch circuit formed by connecting a resistor R7 and a capacitor C1 in parallel, and the other end of the resistor R8 is further connected with a power supply VCC through a parallel circuit formed by connecting the diode D1 and the capacitor C2.
Preferably, the model of the amplifier U1 is LM324, the model of the comparator U2 is LM339, the model of the amplifier U3 is LM1458, and the control module is a PLC logic controller.
The utility model discloses in, can regard as buffer circuit through the setting of RC circuit module, can eliminate the spike voltage that produces when the disconnection to can avoid revealing of the stray current that the device action arouses many times, the effectual rail potential that has reduced has protected passenger's personal safety and near the metal pipeline in tunnel.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the current measuring module of the present invention;
fig. 3 is a schematic circuit diagram of the medium voltage measurement module of the present invention.
In the figure: e1, an RC circuit module, E2, a current measuring module, E3, a voltage measuring module, E4, a contactor switch module, E5 and a bidirectional thyristor module.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 to 3, the device for limiting the potential of the rail of the subway steel comprises an RC circuit module E1, a current measuring module E2, a voltage measuring module E3, a contactor switch module E4, a bidirectional thyristor module E5 and a control module;
one end of the RC circuit module E1 is connected with a steel rail, and the other end of the RC circuit module E1 is connected with one end of the current measuring module E2, and is used for eliminating peak voltage when the subway steel rail potential limiting device is disconnected every time;
the other end of the current measuring module E2 is connected with the ground through a parallel circuit of a contactor switch module E4 and a bidirectional thyristor module E5, and is used for detecting the magnitude of a flowing current value in real time and sending the detected current value to the control module in real time;
the voltage measuring module E3 is connected in parallel with the contactor switch module E4 and is used for detecting the voltage value between the steel rail and the ground in real time and sending the detected voltage value to the control module in real time;
the control module is used for controlling the contactor switch module E4 to pull in a short circuit to lead current to the ground when the detected voltage value exceeds a set value A, and is used for controlling the contactor switch module E4 to be switched off when the detected current value is lower than a set value C; the bidirectional thyristor module E5 is controlled to be connected and the contactor switch module E4 is controlled to be connected in a short circuit mode to conduct current to the ground when the detected voltage value exceeds a set value B, and the contactor switch module E4 is controlled to be disconnected and the bidirectional thyristor module E5 is controlled to be disconnected when the detected current value is lower than a set value C; the set value B is larger than the set value A. When the detected voltage value exceeds the set value B, the bidirectional thyristor module E5 is controlled to be conducted, the contactor switch module E4 is controlled to be in short circuit, and the situation that current cannot be conducted to the ground due to the fact that the contactor switch module E4 fails can be avoided.
The RC circuit module E1 comprises a resistor R9, a capacitor C3 and a diode D2, wherein one end of a branch of the resistor R9 and the capacitor C3 which are connected in parallel is connected with a steel rail, and the other end of the branch is connected with the anode of the diode D2.
Preferably, the current measurement module E2 includes resistors R1 to R5, an amplifier U1 and a comparator U2, one end of the resistor R1 and one end of the resistor R2 are connected and then connected to the cathode of the diode D2, the other end of the resistor R2 is connected to the input pin 1 of the amplifier U1, the input pin 2 of the amplifier U1 is connected to one end of the resistor R3, the cathode of the diode D2 and the ground, the output pin 3 of the amplifier U1 is connected to the other end of the resistor R3 and the input pin 1 of the comparator U2, the input pin 2 of the comparator U2 is connected to the ground and one end of the resistor R4, the other end of the resistor R4 is connected to the power source VCC, the output pin 3 of the comparator U2 is connected to the power source VCC through the resistor R5, and the output pin 3 of the comparator U2 is further connected to the input terminal of the control module, so as to output a voltage signal to the control module; the voltage measurement module E3 comprises resistors R6-R8, an amplifier U3 and a diode D1, an input pin 1 of the amplifier U3 is connected with the ground, an input pin 2 of the amplifier U3 is connected with the other end of a resistor R1 through a resistor R6, an output pin 3 of the amplifier U8 is connected with one end of the resistor R8, the other end of a resistor R8 is connected with an input pin 2 of the amplifier U3 through a branch circuit formed by connecting the resistor R7 and a capacitor C1 in parallel, the other end of the resistor R8 is further connected with a power supply VCC through a parallel circuit formed by connecting the diode D1 and the capacitor C2, and the other end of the resistor R8 is further connected with an input end of the control module so as to.
Preferably, the model of the amplifier U1 is LM324, the model of the comparator U2 is LM339, the model of the amplifier U3 is LM1458, and the control module is a PLC logic controller.
The arrangement of the RC circuit module can be used as a buffer circuit, and the spike voltage generated when the device is disconnected can be eliminated, so that the leakage of stray current caused by multiple actions of the device can be avoided, the potential of the steel rail is effectively reduced, and the personal safety of passengers and metal pipelines near the tunnel are protected.
Claims (4)
1. The device for limiting the potential of the subway steel rail is characterized by comprising an RC circuit module (E1), a current measuring module (E2), a voltage measuring module (E3), a contactor switch module (E4), a bidirectional thyristor module (E5) and a control module;
one end of the RC circuit module (E1) is connected with a steel rail, and the other end of the RC circuit module (E1) is connected with one end of the current measuring module (E2) and used for eliminating spike voltage;
the other end of the current measuring module (E2) is connected with the ground through a parallel circuit of a contactor switch module (E4) and a bidirectional thyristor module (E5) and is used for detecting the magnitude of a flowing current value in real time and sending the detected current value to the control module in real time;
the voltage measuring module (E3) and the contactor switch module (E4) are arranged in parallel and used for detecting the voltage value between the steel rail and the ground in real time and sending the detected voltage value to the control module in real time.
2. A rail potential limiting device for a subway according to claim 1, wherein said RC circuit module (E1) comprises a resistor R9, a capacitor C3 and a diode D2, one end of a branch of said resistor R9 parallel to said capacitor C3 is connected to the rail, and the other end is connected to the anode of said diode D2.
3. The device for limiting the potential of the subway steel rail as claimed in claim 2, wherein said current measuring module (E2) comprises resistors R1-R5, an amplifier U1 and a comparator U2, one end of said resistor R1 and one end of said resistor R2 are connected to the negative pole of diode D2, the other end of said resistor R2 is connected to input pin 1 of amplifier U1, input pin 2 of amplifier U1 is connected to one end of resistor R3, the negative pole of diode D2 and ground, output pin 3 of amplifier U1 is connected to the other end of resistor R3 and input pin 1 of comparator U2, input pin 2 of comparator U2 is connected to ground and one end of resistor R4, the other end of resistor R4 is connected to power VCC, and output pin 3 of comparator U2 is connected to power VCC through resistor R5;
the voltage measurement module (E3) comprises resistors R6-R8, an amplifier U3 and a diode D1, an input pin 1 of the amplifier U3 is connected with the ground, an input pin 2 of the amplifier U3 is connected with the other end of the resistor R1 through a resistor R6, an output pin 3 of the amplifier U8 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with an input pin 2 of the amplifier U3 through a branch circuit formed by connecting the resistor R7 and a capacitor C1 in parallel, and the other end of the resistor R8 is connected with a power supply VCC through a parallel circuit formed by connecting the diode D1 and the capacitor C2.
4. A rail potential limiting device of claim 3, wherein the amplifier U1 is LM324, the comparator U2 is LM339, the amplifier U3 is LM 1458; the control module is a PLC logic controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922090652.XU CN211670626U (en) | 2019-11-28 | 2019-11-28 | Subway rail potential limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922090652.XU CN211670626U (en) | 2019-11-28 | 2019-11-28 | Subway rail potential limiting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211670626U true CN211670626U (en) | 2020-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922090652.XU Active CN211670626U (en) | 2019-11-28 | 2019-11-28 | Subway rail potential limiting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211670626U (en) |
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2019
- 2019-11-28 CN CN201922090652.XU patent/CN211670626U/en active Active
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