CN111030067B - Intelligent protection device for preventing contact net of electric locomotive from being blown - Google Patents
Intelligent protection device for preventing contact net of electric locomotive from being blown Download PDFInfo
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- CN111030067B CN111030067B CN201911367332.2A CN201911367332A CN111030067B CN 111030067 B CN111030067 B CN 111030067B CN 201911367332 A CN201911367332 A CN 201911367332A CN 111030067 B CN111030067 B CN 111030067B
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- module
- pantograph
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- breaking
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The intelligent protection device for preventing the electric locomotive contact net from being blown out comprises a control module, a signal acquisition module, a storage module, a digital input module, a digital output module, a power supply system and a serial port communication module, wherein the signal acquisition module comprises a current signal sampling current and voltage signal sampling circuit, the current signal sampling circuit and the voltage signal sampling circuit sample from the input end of a roof circuit respectively, a locomotive low-voltage cabinet is connected with the power supply system through a power supply conversion circuit for supplying power, the power supply system is connected with the signal acquisition module and the control module, and the control module is further connected with the signal acquisition module, the digital input/output module, the storage module and the serial port communication module. This protection device adopts special integrated chip DSP as CPU, and high accuracy current sampling and processing, data processing speed us level satisfies the high-speed requirement of handling the sampling data, can automatic blockade the closed circuit of pantograph return circuit and main circuit breaker, prevents the scaling loss contact net, provides the guarantee for electric locomotive's pantograph net safe operation.
Description
Technical Field
The invention belongs to the technical field of electric control of electric locomotives, and particularly relates to an intelligent protection device for preventing a contact net of an electric locomotive from being burnt off.
Background
In recent years, along with a large number of accessories of harmonious locomotives in our local area, locomotive pantograph-catenary faults tend to rise, and when primary side current of a network side suddenly increases, the heat productivity between a pantograph slide bar strip and a contact network suddenly rises, the contact network can be burnt off, normal power supply of the whole power supply arm is affected, the railway transportation order is seriously interfered, and C-type and above accidents of railways are formed. The reasons for causing the contact net to blow the contact line are as follows:
(1) the pantograph has low air pressure, the slide bar strip is in poor contact with the contact net lead, and the contact net is blown by arc discharge;
(2) the primary side or secondary side loop of the electric locomotive has a fault, so that the current of the primary side of the electric locomotive greatly rises to blow a contact net.
For the first reason, the normal overhaul, maintenance and repair range is realized through the engineering section, so that the occurrence of accidents can be effectively controlled; the second reason is the uncontrollable factor causing the bow net accident, and needs to be prevented by developing a blowout prevention protection system of the contact net of the electric locomotive.
At present, no protection system for preventing the contact net from being blown out is arranged at the front end of each type of electric locomotive in China, and the pantograph accident caused by secondary closing cannot be avoided.
Disclosure of Invention
In order to solve the technical problems, the invention provides an intelligent anti-burning-off protection device for a contact net of an electric locomotive.
The invention adopts the following specific technical scheme:
the intelligent protection device for preventing the electric locomotive contact net from being blown out comprises a control module, a signal acquisition module, a storage module, a digital input module, a digital output module, a power supply system and a serial port communication module, wherein the signal acquisition module comprises a current signal sampling current and voltage signal sampling circuit, the current signal sampling circuit and the voltage signal sampling circuit sample from the input end of a roof circuit respectively, a locomotive low-voltage cabinet is connected with the power supply system through a power supply conversion circuit for supplying power, the power supply system is connected with the signal acquisition module and the control module, and the control module is further connected with the signal acquisition module, the digital input/output module, the storage module and the serial port communication module.
A sampling circuit of the signal acquisition module adopts a low-pass filter, and meanwhile, signal differential filtering is realized, so that locomotive signal interference is prevented, and high-precision acquisition of current signals is realized.
Preferably, the memory module is provided with 256k memory chips for event and fault logging.
Preferably, the data of the storage module CAN be read out through a serial port communication module by a computer, and the serial port communication module comprises a CAN/RS485 communication interface.
Preferably, the control module adopts an application specific integrated chip DSP.
Preferably, the digital output module comprises a main circuit breaker breaking interface and a pantograph lowering control interface of the pantograph, and the main circuit breaker breaking and pantograph lowering control and the operation/fault display and alarm functions are realized by adopting a relay.
Preferably, a normally closed contact of the relay connected with the breaking interface of the main circuit breaker is connected in series into a loop of the main breaking loop, and when the protection device sends a main breaking instruction, the normally closed contact is broken, and a hardware loop of the main breaking loop is broken; a normally closed contact of a relay connected with a pantograph descending control interface of the pantograph is connected in series with a pantograph ascending electromagnetic valve control loop.
Preferably, the digital input module includes a main circuit breaker state feedback interface, a pantograph state feedback interface, a throw-in/throw-out interface, and a standby interface.
Preferably, a sampling line of the main circuit breaker state feedback interface is connected in a loop of the main circuit breaker auxiliary contact for feeding back to the CCU, so that the interference on the control of the locomotive is reduced.
Preferably, the input signal of the pantograph state feedback interface is output from a pressure switch of the pantograph valve plate, and the pressure switch is closed when the pantograph rising pressure is greater than 3bar, so as to provide a pantograph rising signal for the protection device.
The invention has the beneficial effects that: after the intelligent protection system of the anti-burning contact network of the electric locomotive is put into operation, when the current in a primary circuit exceeds the current integral set by the system, the intelligent protection system sends out a protection indication command to control a locomotive network system to immediately carry out pantograph lowering, main circuit breaker breaking, pantograph raising and main circuit breaking command closing signals to stop locomotive crew from repeatedly raising the pantograph and closing the main circuit breaking operations, a Central Processing Unit (CPU) adopts a special integrated chip DSP (digital signal processor), high-precision current sampling and processing is carried out, the data processing speed is us-level, the requirement of high-speed processing and sampling data is met, and therefore the serious driving safety accident caused by burning off the contact network is effectively prevented.
Drawings
FIG. 1 is a schematic structural view of an intelligent protection device for preventing an electric locomotive catenary from being blown out;
FIG. 2 is a schematic diagram of a system of the intelligent protection device for preventing the contact net of the electric locomotive from being blown out;
FIG. 3 is an electrical schematic diagram of the breaking control of the main circuit breaker of the present invention;
FIG. 4 is a state feedback electrical schematic of the main circuit breaker of the present invention;
FIG. 5 is a state feedback electrical schematic of a pantograph in accordance with the present invention;
FIG. 6 is an electrical schematic diagram of the bow reduction control of the present invention;
fig. 7 is an electrical schematic diagram of a power system of the protection device of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples. The starting materials and methods employed in the examples of the present invention are those conventionally available in the market and conventionally used in the art, unless otherwise specified.
Example 1
As shown in fig. 1, the intelligent protection device for preventing the electric locomotive contact net from being blown out comprises a control module, a signal acquisition module, a storage module, a digital input module, a digital output module, a power system and a serial communication module, wherein the signal acquisition module comprises a current signal sampling current and voltage signal sampling circuit which respectively sample from the input end of a roof circuit through a current transformer and a voltage transformer, a locomotive low-voltage cabinet is connected with the power system for supplying power through a power conversion circuit, the power system is connected with the signal acquisition module and the control module, and the control module is further connected with the signal acquisition module, the digital input/output module, the storage module and the serial communication module.
The control module adopts a special integrated chip DSP, high-precision current sampling and processing and data processing speed us level, and meets the requirement of high-speed processing of sampling data. A sampling circuit of the signal acquisition module adopts a low-pass filter, and meanwhile, signal differential filtering is realized, so that locomotive signal interference is prevented, and high-precision acquisition of current signals is realized. The storage module is provided with a 256k storage chip for event recording and fault recording, and after the device is powered off, data are not lost: event recording: the device is used for recording the test record of drivers and conductors on the device, and in order to ensure the system to be normal and reliable, technicians can test whether the device is normal or not through presetting a test button; and (4) fault recording: the method is used for recording waveform (first: 5 seconds and second: 2 seconds) data before and after a fault for later analysis, and the data can be read out through a communication serial port by a portable computer. The serial port communication module comprises a CAN communication interface and an RS485 communication interface.
Referring to fig. 1 and 2, the locomotive network voltage signal feedback is sampled from the network voltage input end of the electric meter (the network voltage signal of the electric meter is output from the secondary side of the high-voltage transformer of the roof main circuit, the ratio of the high-voltage transformer is 25000: 100), the signal line 1 (wire code 605) and the signal line 2 (wire code 606) of the network voltage signal feedback are connected to the corresponding terminals of the low-voltage cabinet, the current transformer is installed between the pantograph and the voltage transformer, the primary side P1 of the transformer receives the pantograph end, the P2 is connected to the voltage transformer end, the secondary side S1 (CT + terminal) of the transformer is connected to the signal red line 1 (wire code 601) of the current signal feedback, and the S2 (CT-terminal) is connected to the signal blue line 2 (wire code 602) of the current signal feedback, a four-core aviation electric connector is additionally arranged below a top cover for mounting a high-voltage current transformer, so that a circuit can be separated when the top cover is removed.
The digital output module comprises a breaking interface for controlling the main circuit breaker and a pantograph lowering control interface for controlling the pantograph, and adopts a relay to realize breaking of the main circuit breaker and pantograph lowering control and realize operation/fault display and alarm functions.
The digital output module is connected with an operation indicator lamp, when the operation is normal, the indication is bright green, and when the current is detected to exceed the current and the overload time set by the protection device, the fault indicator lamp is bright red and gives an alarm; and the test switch is also connected and used for testing when the protection device is debugged, and when the protection device is in normal operation, the test switch is strictly forbidden to be touched, and when the protection device is in failure, the protection device is reset.
As shown in fig. 3, a normally closed contact of a relay for controlling the connection of the breaking interface of the main circuit breaker is connected in series into a hardware loop in a main breaking loop, and because the locomotive control system adopts a control mode of the main breaking loop for closing and breaking the main breaking, when the protection device sends an instruction of breaking the main breaking, the normally closed contact is broken, the hardware loop of the main breaking loop is broken, the locomotive main breaking is broken, and the locomotive control system can record the breaking of the hardware loop of the main breaking; the specific improved wiring scheme is as follows: (1) in the locomotive low-voltage cabinet, a lead 210623.03 on a 1 st terminal of a terminal row 92-X143.37 is moved to a 30 th terminal of the terminal row, (2) a main breaking control line 1 (3 points of an XT1 connector of the protection device, the lead code is 501) output by the protection device is connected to the 1 st terminal of the terminal row 92-X143.37, and (3) a main breaking control line 2 (4 points of an XT1 connector of the device, the lead code is 502) output by the protection device is connected to the 30 th terminal of the terminal row 92-X143.37.
As shown in fig. 6, when the protection device acts to send a pantograph lowering command, the pantograph should be lowered in the fastest reaction, so that a normally closed contact of the intermediate relay of the protection device is connected in series to the control loop of the pantograph raising solenoid valve. The specific improved wiring scheme is as follows: (1) in the locomotive low-voltage cabinet, a wire 210251.02 on a 45 th terminal of a terminal row 92-X143.47 is moved to a 50 th terminal of the terminal row, (2) a pantograph control wire 1 (7 points of an XT1 connector of the device and a wire code 505) output by a protection device is connected to the 45 th terminal of the terminal row 92-X143.47, and (3) a pantograph control wire 2 (8 points of an XT1 connector of the device and a wire code 506) output by the protection device is connected to the 50 th terminal of the terminal row 92-X143.47.
The digital input module comprises a main breaker state feedback interface, a pantograph state feedback interface, an input/cut-off interface and a standby interface.
Throw/cut rotary switch: when the alarm is normal, the rotary switch is turned to the input position, and when the fault indicator light volume is red and the alarm is given, the fault is removed.
As shown in fig. 4, to minimize interference with the locomotive control system, the sampling line of the protection device is connected in a loop with the main breaker auxiliary contacts feeding back to the CCU. The specific improved wiring scheme is as follows: the main disconnect status sample line of the protection device (13 o' clock of the XT1 connector of the device, conductor code 511) is connected to the 34 th terminal of the low voltage cabinet terminal bank 92-X143.27.
As shown in fig. 5, in order to ensure that the protection device can truly sample the pantograph state, a pantograph state feedback signal is obtained from the pressure switch output of the pantograph valve plate, and when the pantograph rising pressure is greater than 3bar, the pressure switch is closed to provide a pantograph rising signal for the protection device. The specific improved wiring scheme is as follows: the pantograph state sampling line of the protection device (14 point of the XT1 connector of the device, conductor code 512) is connected to the 46 th terminal of the low-voltage cabinet terminal bank 92-X143.47.
As shown in fig. 7, which is an electrical schematic diagram of the power supply system of this embodiment, since the protection device is designed with an automatic switch for overload protection, the dc 110V power supply of the device can be output from the control power supply of the locomotive control circuit to the rear of the automatic switch, and the specific modified wiring scheme is as follows: (1) the power positive line of the protection device (point 1 of the device's XT1 connector, conductor code 111) is connected to the 48 th terminal of the low-voltage cabinet terminal bank 92-X143.37, and the power negative line of the protection device (point 2 of the device's XT1 connector, conductor code 100) is connected to the 33 th terminal of the low-voltage cabinet terminal bank 92-X143.12.
After the intelligent protection device of the anti-burning contact network of the electric locomotive is put into operation, when the current in the primary circuit exceeds the set current integral, the intelligent protection system sends out a protection instruction command to control a locomotive network system to immediately carry out pantograph lowering, main circuit breaker breaking, pantograph raising blocking and main circuit breaking command closing signals, and locomotive crew is blocked from repeatedly carrying out pantograph raising and main circuit breaking operations, so that major driving safety accidents caused by burning off the contact network are effectively prevented.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. The intelligent protection device is characterized by comprising a control module, a signal acquisition module, a storage module, a digital input module, a digital output module, a power system and a serial port communication module, wherein the signal acquisition module comprises a current signal sampling current and voltage signal sampling circuit which respectively samples from the input end of a roof circuit through a current transformer and a voltage transformer;
the digital output module comprises a breaking interface for controlling the main circuit breaker and a pantograph lowering control interface for controlling the pantograph, and the breaking main circuit breaker and the pantograph lowering control are realized by adopting a relay; a normally closed contact of a relay for controlling the breaking interface of the main circuit breaker to be connected is connected in series into a hardware loop in a main breaking loop, and when a main breaking instruction is sent out by a protection device, the normally closed contact is broken, and the hardware loop of the main breaking loop is broken; a normally closed contact of a relay connected with a pantograph descending control interface of the pantograph is connected in series with a pantograph ascending electromagnetic valve control loop;
the digital input module comprises a main circuit breaker state feedback interface, a pantograph state feedback interface, an input/cut-off interface and a standby interface, wherein an input signal of the pantograph state feedback interface is output from a pressure switch of a pantograph valve plate, and the pressure switch is closed when the pantograph rising pressure is greater than 3bar, so that a pantograph rising signal is provided for the protection device;
a sampling line of the state feedback interface of the main circuit breaker is connected in a loop of the auxiliary contact of the main circuit breaker for feeding back to the CCU, so that the interference on the control of the locomotive is reduced;
when the current in the primary side loop acquired by the signal acquisition module exceeds the set current integral, the control module sends a protection instruction to control a locomotive network system to immediately perform pantograph descending and main breaker breaking, block pantograph ascending and main breaking instruction signals, block repeated pantograph ascending and main breaking operations of locomotive crew and effectively prevent a contact network from being blown.
2. The protection device according to claim 1, wherein a low-pass filter is adopted as a sampling circuit of the signal acquisition module, and meanwhile, signal differential filtering is realized, locomotive signal interference is prevented, and high-precision acquisition of current signals is realized.
3. The protection device of claim 1, wherein the memory module provides 256k memory chips for event and fault logging.
4. The protection device of claim 3, wherein the data of the storage module CAN be read out by a computer through a serial communication module, and the serial communication module comprises a CAN/RS485 communication interface.
5. The protection device of claim 1, wherein the control module is an application specific integrated chip (DSP).
6. The protection device of claim 1, wherein the digital output module implements run/fault display and alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911367332.2A CN111030067B (en) | 2019-12-26 | 2019-12-26 | Intelligent protection device for preventing contact net of electric locomotive from being blown |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911367332.2A CN111030067B (en) | 2019-12-26 | 2019-12-26 | Intelligent protection device for preventing contact net of electric locomotive from being blown |
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| Publication Number | Publication Date |
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| CN111030067A CN111030067A (en) | 2020-04-17 |
| CN111030067B true CN111030067B (en) | 2021-10-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104648161A (en) * | 2013-11-22 | 2015-05-27 | 武汉新时代铁路电气有限责任公司 | Anti-breaking device for contact line of electric locomotive |
| CN203651490U (en) * | 2013-11-22 | 2014-06-18 | 武汉新时代铁路电气有限责任公司 | Internet outage preventing device for electric locomotive |
| WO2015097868A1 (en) * | 2013-12-27 | 2015-07-02 | 三菱電機株式会社 | Power conversion device |
| CN110297139B (en) * | 2019-06-25 | 2021-11-16 | 中车青岛四方机车车辆股份有限公司 | Rail vehicle network side fault point detection device and method |
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