CN219107134U - DC traction protection measurement and control device - Google Patents
DC traction protection measurement and control device Download PDFInfo
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- CN219107134U CN219107134U CN202222917906.2U CN202222917906U CN219107134U CN 219107134 U CN219107134 U CN 219107134U CN 202222917906 U CN202222917906 U CN 202222917906U CN 219107134 U CN219107134 U CN 219107134U
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Abstract
The utility model discloses a direct current traction protection measurement and control device which comprises a panel, a main board, an analog quantity acquisition board, an Ethernet board, a power supply board, a terminal board, an expansion board, a chassis and a wiring terminal, wherein the panel is connected with the main board; the main board, the analog acquisition board, the Ethernet board, the power supply board, the terminal board and the expansion board are all arranged in the case, the wiring terminal is arranged at the rear part of the case, and the panel is arranged at the front surface of the case; the main board, the analog quantity acquisition board, the Ethernet board and the power board are connected together through pin headers, and then are connected with the terminal board through terminals of the analog quantity acquisition board and the power board; the wiring terminal is connected to a voltage and current transducer, a switching value signal, a circuit breaker control signal, a power supply, a communication terminal block and the like in the power supply system through a cable, and functions of protecting the direct current traction power supply system are provided, wherein the functions comprise overheat, overcurrent, delta I, di/dt, overvoltage, low voltage, frame leakage current, frame overvoltage, failure, digital communication protection and the like.
Description
Technical Field
The utility model relates to the field of direct current traction protection, in particular to a direct current traction protection measurement and control device.
Background
In recent years, with the rapid increase of Chinese economy and the rapid promotion of urban process, the urban rail transit industry of China is rapidly developed, and the urban rail transit industry has a wide prospect.
On the premise that urban rail transit development is rapid, the safe and reliable running of the train is ensured, and the life and property safety of personnel is the first place. The safe operation of the direct current traction power supply system is the basis for ensuring the safety of a subway locomotive, and the direct current traction power supply system is faced with a huge and complex direct current traction power supply system, which clearly puts forward higher requirements on the safety and reliability of the urban rail transit power supply system. An extension plate is arranged in the direct current traction protection measurement and control device for adding a functional module, the existing extension plate adopts an RS485 or 232 communication protocol mode for data transmission, the anti-interference performance is relatively weak, and the extension plate is connected as an independent part in a direct connection mode when receiving an external signal, so that unified management of wiring terminals is not facilitated.
Disclosure of Invention
The utility model provides a direct current traction protection measurement and control device aiming at the problems, which mainly solves the problems in the background technology.
The utility model provides a direct current traction protection measurement and control device which comprises a panel, a main board, an analog quantity acquisition board, an Ethernet board, a power supply board, a terminal board, an expansion board, a chassis and a wiring terminal, wherein the panel is connected with the main board through the Ethernet board; the main board, the analog acquisition board, the Ethernet board, the power supply board, the terminal board and the expansion board are all arranged in the case, the wiring terminal is arranged at the rear part of the case, and the panel is arranged at the front surface of the case; the main board is connected with the analog quantity acquisition board, the Ethernet board and the power board through pin row bus bars, and terminals of the analog quantity acquisition board, the power board and the expansion board are connected with the terminal board; the panel is connected with the main board through a flat cable, and the expansion board is communicated with the main board through a CAN; the wiring terminal is connected with the terminal board and is connected to a terminal block of a power supply system, which is connected with a voltage and current transducer, a switching value signal, a circuit breaker control signal and a power supply through cables.
The further improvement is that the main board comprises an MCU and a SRAM, RTC, EEPROM, FLASH, ADC loop, an RS232/RS485 communication loop, a CAN communication loop, a switching value input loop, a switching value output loop and an Ethernet communication loop which are connected with the MCU; wherein, the MCU runs the device program to control the peripheral circuit; the SRAM is used for providing readable and writable storage; the RTC is used for providing clock correction; the ADC loop is used for converting an analog quantity signal output by the analog quantity acquisition board into a digital quantity; the RS232/RS485 communication loop is used for providing a 485 communication interface between the device and external equipment and a 232 communication interface between the main board and the panel; the CAN communication loop is used for communicating with the expansion board; the switching value input circuit is used for inputting switching value signals on the power panel to the MCU; the switching value output loop is used for transmitting switching value output signals of the MCU to the relay output driving loop on the power panel; the Ethernet communication loop is responsible for communication between the MCU and the Ethernet board.
The further improvement is that the panel comprises a USB board and an MMI board, and the USB board is provided with a TYPE-C USB interface and is arranged on the front surface of the case; the MMI board includes a liquid crystal, a keypad, and an LED lamp.
A further improvement is that the analog signal comprises a direct current and a direct voltage signal.
The further improvement is that the Ethernet board is provided with an Ethernet communication interface for communicating with the outside; the Ethernet board is connected to the Ethernet communication loop of the main board inside the case.
The power panel is further improved in that the power panel also comprises an open-in loop and an open-out loop; the switching-in loop comprises 4 paths of photoelectric isolation input, and is used for converting an external switching-value strong electric signal into a weak electric signal and transmitting the weak electric signal to a switching-value input loop on the main board; the open-loop comprises 6 paths of relay outputs, receives a switching value output instruction sent by the main board, and provides a switching value control signal for equipment outside the case.
The further improvement is that the terminal board is also provided with a connecting socket which is used for fixing each board.
The expansion board is provided with an expanded input channel and an expanded output channel, and control signals of the main board are received through the CAN.
The further improvement lies in that binding post is connected with power supply system terminal bar, transmission signal and power, and the signal includes switching value input signal, switching value output signal, current signal, voltage signal, communication signal and power.
The direct current traction protection measurement and control device provided by the embodiment of the utility model has at least the following beneficial effects:
1. the hardware design of the direct current traction protection measurement and control device is provided, the device is divided into a plurality of plates according to the hardware function, the maintenance is convenient, the strong current and weak current loops are separated in space, and the operation of the MCU is prevented from being influenced by external interference;
2. the function expansion scheme is provided, CAN communication is adopted as an expansion interface, and on the premise of meeting the performance requirement, the expansion interface is simplified, and the anti-interference capability is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
FIG. 1 is a topology diagram of an overall frame of a DC traction protection measurement and control device according to an embodiment of the present utility model;
FIG. 2 is a block diagram of an MMI board of the DC traction protection measurement and control device shown in FIG. 1;
FIG. 3 is a block diagram of a motherboard of the DC traction protection measurement and control device shown in FIG. 1;
FIG. 4 is a block diagram of an analog acquisition board of the DC traction protection measurement and control device shown in FIG. 1;
FIG. 5 is a block diagram of a power panel of the DC traction protection measurement and control device shown in FIG. 1;
FIG. 6 is an expanded board block diagram of the DC traction protection measurement and control device shown in FIG. 1;
FIG. 7 is a data exchange diagram of the DC traction protection measurement and control device shown in FIG. 1;
FIG. 8 is a first terminal definition diagram of the DC traction protection measurement and control device shown in FIG. 1;
FIG. 9 is a second terminal definition diagram of the DC traction protection measurement and control device of FIG. 1;
fig. 10 is a third terminal definition diagram of the dc traction protection measurement and control device shown in fig. 1.
Detailed Description
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, so to speak, the two elements are communicated internally. It will be understood by those of ordinary skill in the art that the terms described above are in the specific sense of the present utility model. The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, a direct current traction protection measurement and control device comprises a panel, a main board, an analog acquisition board, an ethernet board, a power board, a terminal board, an expansion board, a case and a wiring terminal; the main board, the analog acquisition board, the Ethernet board, the power supply board, the terminal board and the expansion board are all arranged in the case, the wiring terminal is arranged at the rear part of the case, and the panel is arranged at the front surface of the case; the main board is connected with the analog quantity acquisition board, the Ethernet board and the power board through pin row bus bars, and terminals of the analog quantity acquisition board, the power board and the expansion board are connected with the terminal board; the panel is connected with the main board through a flat cable, the communication mode is one or more of RS232, RS485 and CAN (controller area network), and the expansion board is communicated with the main board through the CAN; the wiring terminal is connected with the terminal board and is connected to a terminal block connected with a voltage and current transmitter, a switching value signal, a circuit breaker control signal and a power supply in the power supply system through a cable, the direct current traction protection measurement and control device is divided into a plurality of boards according to hardware functions, the maintenance is convenient, strong current and weak current loops are separated in space, and the influence of external interference on the operation of an MCU (micro control unit) is avoided; the CAN communication is adopted as the expansion interface, so that the expansion interface is simplified and the anti-interference capability is improved on the premise of meeting the performance requirement.
It is to be understood that the direct current traction protection measurement and control device detects the current and the voltage of the main loop of the direct current switch cabinet, when the cable and the contact net (contact rail) of the direct current traction power supply system are in fault, the current and the voltage are changed, and the amplitude, the direction, the change rate and the like of the direct current traction power supply system are different from those of the train when the train normally passes through the direct current traction power supply system; the direct current traction protection measurement and control device detects and judges voltage and current quantity, when the voltage and the current quantity meet the action conditions of the device, a relay in the device acts to drive the direct current breaker to trip, isolate faults, conduct line test according to the fault conditions and drive the direct current breaker to close, if the power supply recovery conditions are met, the closing is successful, otherwise, the relay trips again, and the process can be repeated for a plurality of times.
As a preferred embodiment of the present utility model, referring to fig. 1 to 7, the main board includes an MCU (micro control unit), an SRAM (static random access memory), an RTC (real time clock), an EEPROM (charged erasable programmable read only memory), a FLASH (nonvolatile memory), an ADC (analog-to-digital converter), an RS232/RS485 communication circuit, a CAN communication circuit, a switching value input circuit, a switching value output circuit, an ethernet communication circuit, and the like; wherein, the MCU runs the device program to control the peripheral circuit; the SRAM is used for providing readable and writable storage; the RTC is used for providing clock correction; the EEPROM stores important parameters, and can be still stored after power failure; the ADC loop is used for converting an analog quantity signal output by the analog quantity acquisition board into a digital quantity; the RS232/RS485 communication loop is used for providing a 485 communication interface between the device and external equipment and a 232 communication interface between the main board and the panel; the CAN communication loop is used for communicating with the expansion board; the switching value input circuit is used for inputting switching value signals on the power panel to the MCU; the switching value output loop is used for transmitting switching value output signals of the MCU to the relay output driving loop on the power panel; the Ethernet communication loop is responsible for communication between the MCU and the Ethernet board.
Specifically, the main board further comprises a standby battery, and the standby battery provides temporary power supply for the main board clock, the SRAM and the RTC when the external power supply is powered off.
As a preferred embodiment of the present utility model, referring to fig. 1 to 2, the panel includes a USB board and an MMI board, the USB board is provided with a TYPE-C USB interface and is disposed on the front of the chassis; the MMI board comprises a liquid crystal, a keyboard and LED lamps and provides man-machine interaction functions.
As a preferred embodiment of the present utility model, referring to fig. 1 to 4, an analog acquisition board acquires analog signals, and sends the analog signals to an ADC circuit of a main board for AD conversion, where the analog signals include direct current and direct voltage signals.
As a preferred embodiment of the present utility model, referring to fig. 1 to 7, an ethernet board is provided with an ethernet communication interface for communicating with the outside; the Ethernet board is connected to the Ethernet communication loop of the main board inside the case.
As a preferred embodiment of the present utility model, referring to fig. 1 to 7, the power panel further includes an open inlet circuit and an open outlet circuit; the switching-in loop comprises 4 paths of photoelectric isolation input, and is used for converting an external switching-value strong electric signal into a weak electric signal and transmitting the weak electric signal to a switching-value input loop on the main board; the open-loop comprises 6 paths of relay outputs, receives a switching value output instruction sent by the main board, and provides a switching value control signal for equipment outside the case.
As a preferred embodiment of the present utility model, referring to fig. 1 to 7, the terminal board provides transmission channels for electric power and signal quantity between the respective boards and between the boards and the connection terminals, and is further provided with connection sockets for fixing the respective boards.
As a preferred embodiment of the present utility model, referring to fig. 1 to 7, the expansion board is provided with an extended input channel and an extended output, and receives a control signal of the main board through the CAN.
Specifically, the expansion board provides 3 configurations:
1. 10 paths of photoelectric isolated switching-in quantity interfaces and 4 paths of relay outputs;
2. 10 paths of photoelectric isolated opening and closing interfaces and 3 paths of relays are used for outputting, and 1 path of direct current is used for outputting +/-15V;
3. 14 paths of photoelectric isolated opening-in quantity interfaces;
each direct current traction protection measurement and control device comprises at most two expansion plates.
As a preferred embodiment of the present utility model, referring to fig. 1 to 10, the connection terminal is connected to a power supply system terminal block, and transmits signals and power sources, the signals including a switching value input signal, a switching value output signal, a current signal, a voltage signal, a communication signal and a power source.
Specifically, according to the configuration of the expansion board relay R1, the definition of the connection terminal is divided into three types: 10-way open-in+4-way open-out shown in fig. 8; 10-way open-in+3-way open-out+1-way direct current output shown in fig. 9; the 14-way open shown in fig. 10;
AI1+, AI 1-to AI8+, AI 8-represent the positive and negative of the 1-to 8-way analog input.
OUT1 to OUT14 represent the 1 to 14 relay outlets of the device, define the common end with the "COM" character represented as the corresponding number outlet, the normally open contact with the "NO" character represented as the corresponding number outlet, the normally closed contact with the "NO" character represented as the corresponding number outlet, the other outlets and so on; where OUTCOM denotes the common terminal of the OUT2 to OUT5 outlets.
IN1 to IN4 represent anodes of 1 to 4 open-ended inputs, COM represents a common terminal of 1 to 4 open-ended inputs.
In5+, IN 5-through In36+, IN 36-represent the positive and negative poles of 5-36 open-ended inputs.
DC15VOUT+, DC15 VOUT-represent the positive and negative poles of the 15V direct current output.
L1 and L2 represent power sources of the devices.
CANH, CANL represent CAN communication interfaces.
485-A1, 485-B1 represent 485 communication interfaces.
FG is shielding ground.
NC is a null terminal.
As a preferred embodiment of the present utility model, referring to fig. 1 to 7, the dc traction protection measurement and control device may be disposed throughout the power supply system, and the dc traction protection measurement and control device performs data transmission and comparison, so as to control the bilateral linkage trip or lock of the power supply system.
Specifically, the direct current traction protection measurement and control device provides a bidirectional relay-relay digital communication protection function, can realize quick and safe information exchange between relays, and effectively solves the problems of poor anti-interference capability and low data transmission reliability of a direct current double-side joint jump scheme of a traditional cable transmission signal. Eight output TMB1X-TMB8X (X is channel A or B) and eight input RMB1X-RMB8X (X is channel A or B) bit signals are added for each serial port in bidirectional digital communication to realize information transmission at two ends of a line, and as output joints and input joints are not needed, faults are accurately and rapidly judged, the overall action time of bilateral jump is shortened, communication between two direct current traction protection measurement and control devices can be realized in various modes such as communication cables, optical fibers and the like, data protected between two direct current traction protection measurement and control devices are shown in FIG. 7, transmitted data bits can be freely defined through a logic equation, and received data bits can realize locking and control of local protection through the logic equation.
The present utility model can implement the following functions by the above embodiments:
1. overheat protection: according to the heat of the direct current cable and the contact net (contact rail) accumulated by the load current, the direct current cable and the contact net (contact rail) are protected from being damaged by overheat.
2. Overcurrent protection: detecting current, starting a fixed value after the current is larger than a given value, and judging that the direct current cable or the contact network (contact rail) fails to trip the direct current breaker if the current continuously meets the set time. The device has four sections of overcurrent protection, and each section of protection can be set to have timing and inverse timing characteristics and can be controlled by a directional element. The inverse time limit comprises three inverse time limit characteristic curves of IEC A and B, C.
3.Δi protection: for protecting short-distance direct current cables or contact lines (contact rails) from faults. When the current rising rate detected by the device is greater than the set value, the device starts and records the current at the moment as an initial value for calculating delta I, and starts timing. If the current rising rate di/dt is always larger than the set value in a given time, calculating the value of delta I after the timing reaches the given time, and if delta I is larger than the set value, disconnecting the protection;
if the current rise rate is smaller than the set value in a given time, delay is started from the point, and if the current rise rate is larger than the set value again, the current is recorded as an initial value for calculating delta I. After the timing arrives, the value of DeltaI is calculated, and if DeltaI is set as DeltaI 1P, the protection is disconnected.
4. di/dt protection: the protection device is used for protecting the faults of the medium and long-distance direct current cable or the contact net (contact rail). And when the current rising rate is higher than the current rising rate set by protection, starting delay. If the rate of rise of the current is higher than the set value over a given time, the protection is opened.
5. Overvoltage protection: when the voltage is larger than the set overvoltage fixed value, the overvoltage element cuts off the outlet after the set delay.
6. Low pressure protection: when the voltage is smaller than the set low-voltage fixed value, the low-voltage element cuts off the outlet after setting delay.
7. Frame leakage current protection and overvoltage protection: the device monitors leakage current and voltage of a grounding part and a live part of direct current system equipment (a switch cabinet, a rectifier unit and the like). When the current or voltage is larger than the set value, the protection is turned off through setting delay.
9. Failure protection: because the direct current breaker self-fault causes fault clearing failure, a tripping command is sent to the adjacent direct current switch through failure protection, the purpose of clearing isolation fault points is achieved, and the normal and safe operation of the system is maintained
10. Reclosing: after the device is disconnected and tripped, the device can be reclosed for a plurality of rounds in order to restore the power supply as much as possible. The device provides 4 reclosings.
11. And (3) line testing: before the device sends a closing instruction to the direct current breaker, a line test loop of a switch cabinet is firstly put into, the insulation condition of the contact net (contact rail) is judged by detecting the voltage of the contact net (contact rail) after the line test loop is put into, and if the insulation condition does not meet the requirement, the switch can not be closed.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (9)
1. The direct current traction protection measurement and control device is characterized by comprising a panel, a main board, an analog quantity acquisition board, an Ethernet board, a power supply board, a terminal board, an expansion board, a chassis and a wiring terminal;
the main board, the analog acquisition board, the Ethernet board, the power supply board, the terminal board and the expansion board are all arranged in the case, the wiring terminals are arranged at the rear part of the case, and the panel is arranged at the front surface of the case;
the main board is connected with the analog quantity acquisition board, the Ethernet board and the power board through pin row bus bars, and terminals of the analog quantity acquisition board, the power board and the expansion board are connected with the terminal board; the panel is connected with the main board through a flat cable, and the expansion board is communicated with the main board through CAN;
the wiring terminal is connected with the terminal board and is connected to a terminal block of a power supply system, which is connected with a voltage and current transducer, a switching value signal, a circuit breaker control signal and a power supply through cables.
2. The direct current traction protection measurement and control device according to claim 1, wherein the main board comprises an MCU, a static random access memory SRAM, a real-time clock RTC, an electrified erasable programmable read-only memory EEPROM, a nonvolatile memory FLASH, an analog-to-digital converter ADC loop, an RS232/RS485 communication loop, a CAN communication loop, a switching value input loop, a switching value output loop and an Ethernet communication loop which are connected with the MCU;
wherein, the MCU runs a device program to control a peripheral circuit; the SRAM is used for providing readable and writable storage; the real-time clock RTC is used for providing clock correction; the analog-to-digital converter ADC loop is used for converting an analog quantity signal output by the analog quantity acquisition board into a digital quantity; the RS232/RS485 communication loop is used for providing a 485 communication interface between the device and external equipment and a 232 communication interface between the main board and the panel; the CAN communication loop is used for communicating with the expansion board; the switching value input circuit is used for inputting switching value signals on the power panel to the MCU; the switching value output loop is used for transmitting switching value output signals of the MCU to the relay output driving loop on the power panel; the Ethernet communication loop is responsible for communication between the MCU and the Ethernet board.
3. The direct current traction protection measurement and control device according to claim 1, wherein the panel comprises a USB board and an MMI board, and the USB board is provided with a TYPE-C USB interface and is arranged on the front surface of the case; the MMI board comprises a liquid crystal, a keyboard and an LED lamp.
4. The direct current traction protection measurement and control device according to claim 2, wherein the analog signal comprises a direct current and direct voltage signal.
5. The direct current traction protection measurement and control device according to claim 1, wherein the ethernet board is provided with an ethernet communication interface for communicating with the outside; the Ethernet board is connected to the Ethernet communication loop of the main board inside the case.
6. The direct current traction protection measurement and control device according to claim 1, wherein the power panel further comprises an open-in loop and an open-out loop; the switching-in loop comprises 4 paths of photoelectric isolation inputs, and is used for converting an external switching-value strong electric signal into a weak electric signal and transmitting the weak electric signal to a switching-value input loop on the main board; the open-loop comprises 6 paths of relay outputs, receives a switching value output instruction sent by the main board, and provides a switching value control signal for equipment outside the case.
7. The direct current traction protection measurement and control device according to claim 1, wherein the terminal board is further provided with a connection socket for fixing each board.
8. The direct current traction protection measurement and control device according to claim 7, wherein the expansion board is provided with an expanded input channel and an expanded output channel, and a control signal of the main board is received through the CAN.
9. The direct current traction protection measurement and control device according to claim 1, wherein the wiring terminal is connected with a terminal block of a power supply system to transmit signals and power, and the signals comprise a switching value input signal, a switching value output signal, a current signal, a voltage signal, a communication signal and power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222917906.2U CN219107134U (en) | 2022-11-02 | 2022-11-02 | DC traction protection measurement and control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222917906.2U CN219107134U (en) | 2022-11-02 | 2022-11-02 | DC traction protection measurement and control device |
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| CN219107134U true CN219107134U (en) | 2023-05-30 |
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| CN202222917906.2U Active CN219107134U (en) | 2022-11-02 | 2022-11-02 | DC traction protection measurement and control device |
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