Intelligent traction network differential protection device applicable to various communication interfaces
By designing an intelligent traction network differential protection device that supports both fiber optic channels and data network channels, the problems of large number of devices and low reliability in traditional devices have been solved, achieving a reduction in equipment and an improvement in reliability.
Patent Information
- Application Number
- CN202520232657.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-14
AI Technical Summary
Traditional traction network differential protection devices require the reuse of interface devices in data network mode, which increases the number of devices and reduces operational reliability.
Design an intelligent traction network differential protection device that supports both independent fiber optic channel and data network channel modes. Automatic switching of the data channel is achieved through a switching switch and main control module, eliminating the need for multiplexing interface devices and reducing the number of devices.
It improves the reliability of differential protection data transmission, reduces the number of supporting devices, and achieves dual-channel redundant operation.
Smart Images
Figure CN223583794U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electrified railway traction power supply technology, specifically relating to an intelligent traction network differential protection device applicable to multiple communication interfaces. Background Technology
[0002] my country's electrified railway traction power supply system includes various power supply methods, such as direct power supply, direct power supply with overhead return lines, BT power supply, single-track AT power supply, and fully parallel AT power supply. In some areas with complex terrain or long gradients, a double-sided power supply method has been adopted to increase traction power supply capacity and eliminate phase separation. The original single-sided power supply system has been changed to a double-sided power supply, and the traction network equipment also uses traction network differential protection as the main protection. Differential protection requires the laying or configuration of communication channels between the stations where the protection devices are installed. Differential protection channels have two modes: independent fiber optic channels and data networks. When traditional traction network differential protection devices use the data network mode for differential data transmission, a multiplexing interface device needs to be added between the protection device and the data network channel for interface conversion between the optical interface and the data network. This method increases the number of supporting equipment for traction network differential protection and reduces the operational reliability of traction network differential protection. Utility Model Content
[0003] The purpose of this invention is to provide an intelligent traction network differential protection device that is applicable to multiple communication interfaces and supports two differential channel modes. In the data network channel mode, the multiplexing interface device is eliminated, reducing the number of supporting equipment for traction network differential protection.
[0004] The technical solution adopted in this utility model is as follows:
[0005] A smart traction network differential protection device applicable to multiple communication interfaces includes a main control module, a switching switch, a CPU module, and a 2M communication interface module. The switching switch is connected to the main control module, and the CPU module and the 2M communication interface module are respectively connected to the main control module via a differential data bus. The main control module is used to switch the channel for receiving differential data from the differential data bus according to the state of the switching switch. The channel includes an independent optical fiber channel transmitted through the CPU module and a data network channel transmitted through the 2M communication interface module.
[0006] In some specific implementations, the switching switch uses a 2-bit DIP switch, which switches the channel for receiving differential data according to the state of the 2-bit DIP switch.
[0007] In some specific implementations, when the main control module receives a DIP switch state of 01, it triggers the differential data receiving channel to switch to the independent fiber optic channel; when it receives a DIP switch state of 10, it triggers the differential data receiving channel to switch to the data network channel; and when it receives a DIP switch state of 11, it triggers the differential data receiving channel to switch to simultaneously receiving differential data from both the independent fiber optic channel and the data network channel.
[0008] In some specific implementations, the main control module includes a status judgment module, a first switching switch, and a second switching switch. The status judgment module is used to trigger the operation of the first switching switch and the second switching switch according to the status of the DIP switch. The first switching switch is used to connect the main control module to an independent optical fiber channel, and the second switching switch is used to connect the main control module to a data network channel.
[0009] In some specific implementations, the status determination module includes a first logic module, a second logic module, and a third logic module. The first logic module is used to trigger the first switching switch, the second logic module is used to trigger the action of the second switching switch, and the third logic module is used to trigger the actions of the first switching switch and the second switching switch.
[0010] In some specific embodiments, the first logic module includes a NOT gate and an AND gate, the second logic module includes a NOT gate and an AND gate, and the third logic module includes an AND gate. DIP switch ports 1 and 2 are connected respectively. When port 1 is in the off state and port 2 is in the on state, the first logic module outputs a high level to trigger the first switch to operate. When port 1 is in the on state and port 2 is in the off state, the second logic module outputs a high level to trigger the second switch to operate. When port 1 is in the on state and port 2 is in the on state, the third logic module outputs a high level to trigger both the first and second switches to operate.
[0011] In some specific implementations, the CPU plug-in includes a fiber optic interface access device and a photoelectric conversion device. The fiber optic interface access device is used to receive differential protection optical signals from the intelligent unit, and the photoelectric conversion device is used to convert the differential protection optical signals into differential protection data. The differential protection data is uploaded to the main control device through the differential data bus.
[0012] In some specific implementations, the 2M communication interface plug-in includes a 2M coaxial cable interface access device and a digital signal processor. The 2M coaxial cable interface access device is used to receive data network signals from the intelligent unit, and the digital signal processor is used to decode the data network signals into differential protection data. The differential protection data is uploaded to the main control device through the differential data bus.
[0013] The beneficial effects of this utility model are:
[0014] This invention supports two differential channel access modes simultaneously. In the data network channel mode, the multiplexing interface device is eliminated, reducing the number of supporting devices for traction network differential protection. It also supports redundant operation of the independent optical fiber and data network dual channels for differential protection, improving the reliability of differential protection data transmission. Attached Figure Description
[0015] Figure 1 A block diagram of a traction network differential protection device applicable to multiple communication interfaces provided for embodiments of this utility model.
[0016] Figure 2 This is a schematic diagram of the logical connection of the state judgment module provided in an embodiment of the present utility model.
[0017] Figure 3 A schematic diagram showing the connection of three traction network differential protection devices provided in this embodiment of the utility model.
[0018] Figure 4 A schematic diagram of the hardware architecture of the traction network differential protection device provided in this embodiment of the utility model. Detailed Implementation
[0019] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.
[0020] In the description of this utility model, it should be noted that the terms "a", "b", etc., indicating quantities are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific quantity, or be constructed and operated in a specific quantity, and therefore should not be construed as a limitation on this utility model.
[0021] Example 1
[0022] like Figure 1 As shown in the figure. This embodiment provides an intelligent traction network differential protection device applicable to multiple communication interfaces, including: a main control module, a switching switch, a CPU module, and a 2M communication interface module. The switching switch is connected to the main control module, and the CPU module and the 2M communication interface module are respectively connected to the main control module via a differential data bus. The main control module is used to switch the channel for receiving differential data from the differential data bus according to the state of the switching switch. The channel includes an independent optical fiber channel transmitted through the CPU module and a data network channel transmitted through the 2M communication interface module.
[0023] Specifically, the switching switch uses a 2-bit DIP switch to switch the channel for receiving differential data according to the state of the 2-bit DIP switch.
[0024] In some specific implementations, the main control module includes a status judgment module, a first switching switch, and a second switching switch. The status judgment module is used to trigger the operation of the first switching switch and the second switching switch according to the status of the DIP switch. The first switching switch is used to connect the main control module to an independent optical fiber channel, and the second switching switch is used to connect the main control module to a data network channel.
[0025] In some specific implementations, such as Figure 2 As shown, the status judgment module includes a first logic module, a second logic module, and a third logic module. The first logic module is used to trigger the first switching switch, the second logic module is used to trigger the second switching switch, and the third logic module is used to trigger the first switching switch and the second switching switch.
[0026] In some specific embodiments, the first logic module includes a NOT gate and an AND gate, the second logic module includes a NOT gate and an AND gate, and the third logic module includes an AND gate. DIP switch ports 1 and 2 are connected respectively. When port 1 is in the off state and port 2 is in the on state, the first logic module outputs a high level to trigger the first switch to operate. When port 1 is in the on state and port 2 is in the off state, the second logic module outputs a high level to trigger the second switch to operate. When port 1 is in the on state and port 2 is in the on state, the third logic module outputs a high level to trigger both the first and second switches to operate.
[0027] In some specific implementations, when the main control module receives a DIP switch state of 01, it triggers the differential data receiving channel to switch to the independent fiber optic channel; when it receives a DIP switch state of 10, it triggers the differential data receiving channel to switch to the data network channel; and when it receives a DIP switch state of 11, it triggers the differential data receiving channel to switch to simultaneously receiving differential data from both the independent fiber optic channel and the data network channel.
[0028] In some specific implementations, the CPU plug-in includes a fiber optic interface access device and a photoelectric conversion device. The fiber optic interface access device is used to receive differential protection optical signals from the intelligent unit, and the photoelectric conversion device is used to convert the differential protection optical signals into differential protection data. The differential protection data is uploaded to the main control device through the differential data bus.
[0029] In some specific implementations, the 2M communication interface plug-in includes a 2M coaxial cable interface access device and a digital signal processor. The 2M coaxial cable interface access device is used to receive data network signals from the intelligent unit, and the digital signal processor is used to decode the data network signals into differential protection data. The differential protection data is uploaded to the main control device through the differential data bus.
[0030] like Figure 4As shown, the differential protection device consists of a CPU module, a 2M communication interface module, an NPI module, an input module, an output module, a power supply module, and a human-machine interface unit, arranged in a modular fashion.
[0031] (1) Main hardware interfaces of the device plug-in
[0032] The CPU module provides two fiber optic interfaces, supporting data exchange between up to three traction network differential protection devices. The three differential protection devices are connected via fiber optic cables. Figure 3 As shown. The fiber optic interface is single-mode fiber, and the fiber optic connection interface type is FC; it provides 2 Ethernet ports (RJ45 interfaces) for the device to access the station control layer monitoring system; it provides 2 process layer optical Ethernet ports (LC interfaces) for receiving AC digital information and external GOOSE inputs; and it provides 1 optical B code time synchronization port for receiving external time synchronization information.
[0033] The 2M communication interface plug-in provides two 2M interfaces, which are coaxial cables. It supports data exchange between up to three traction network differential protection devices. The three differential protection devices are connected via coaxial cables. Figure 3 As shown.
[0034] The input module provides 31 high-voltage inputs, with input power adaptive to DC220 / 110V; the output module provides 20 outputs; the device power module is adaptive to DC220 / 110V, provides a set of power failure alarm contacts, and provides 15 inputs, with input power adaptive to DC220 / 110V.
[0035] (2) Main working principle of the device
[0036] The hardware architecture of the traction network differential protection device is as follows: Figure 4 As shown, the device receives digital and analog signals transmitted from the intelligent unit and inputs them into the FPGA chip in SV format. External conventional switching information is input into the FPGA chip through an input module, digital switching signals are input into the FPGA chip in GOOSE format, and differential protection data is input into the FPGA chip through the differential data bus. The FPGA chip performs high-performance logic operations and data interaction based on the input information, outputs signals through the output array, and sends the processed data to the CPU through the data interaction channel. The CPU performs calculations related to protection and measurement and control, and interacts with external devices through a human-machine interface (keyboard, LCD, debugging network port, etc.). Important alarm tripping information is provided to the process layer devices by driving the corresponding relays in hardware contact mode or in GOOSE format through the process layer optical port.
[0037] This embodiment of the device supports simultaneous access to both the independent fiber optic channel and the data network channel for differential protection. When the differential protection channel is an independent fiber optic channel, it is connected to the device through the fiber optic interface of the CPU plug-in. The device converts the optical signal into an electrical signal through a photoelectric converter, and the differential protection data enters the differential data bus. When the differential protection channel is a 2M data network channel, it is connected to the device through the 2M coaxial cable interface of the 2M communication interface plug-in. The device's digital signal processor (DSP) decodes the data network signal and then converts it into Ethernet format data packets, which are then connected to the differential data bus. The conversion methods are all existing and commonly used methods that can be implemented based on the functionality of the device itself, and will not be described in detail in this application.
[0038] The FPGA chip can autonomously switch between independent fiber optic channels and data network channels by using DIP switches, or it can choose to operate both independent fiber optic channels and data network channels simultaneously.
[0039] The differential protection device is equipped with a 2-position DIP switch. When the DIP switch is set to 01, the device receives differential data from the independent fiber optic channel; when the DIP switch is set to 10, the device receives differential data from the data network channel; when the DIP switch is set to 11, the device receives differential data from both the independent fiber optic channel and the data network channel simultaneously, and prioritizes the differential data from the independent fiber optic channel.
[0040] This embodiment also provides a differential protection logic: if the device detects an interruption of the independent fiber optic channel or a differential protection data error rate > 0.01%, it issues a differential channel abnormality alarm and blocks the differential protection; if the device detects an interruption of the data network channel or a differential protection data error rate > 0.01%, it issues a differential channel abnormality alarm and blocks the differential protection; when the independent fiber optic channel is interrupted or the differential protection data error rate > 0.01%, the device switches to using data network channel data; when the independent data network channel is interrupted or the differential protection data error rate > 0.01% and the independent fiber optic channel is normal, the device switches to using independent fiber optic channel data; differential protection is blocked only when both the independent fiber optic channel and the data network channel are interrupted or the differential protection data error rate > 0.01%. The methods for calculating the bit error rate and detecting channel interruption described above are existing technologies and are not the focus of this application. The focus of this application is that it can simultaneously support two differential channel access modes. In the data network channel mode, the multiplexing interface device is eliminated, reducing the number of supporting devices for traction network differential protection. It supports redundant operation of independent optical fiber and data network dual channels for differential protection, improving the reliability of differential protection data transmission.
Claims
1. A smart traction network differential protection device applicable to various communication interfaces, characterized in that, The device comprises a main control module, a switch, a CPU plug-in and a 2M communication interface plug-in, wherein the switch is connected with the main control module, the CPU plug-in and the 2M communication interface plug-in are respectively connected with the main control module through a differential data bus, and the main control module is used for switching the channel for receiving differential data from the differential data bus according to the state of the switch, wherein the channel comprises an independent optical fiber channel transmitted through the CPU plug-in and a data network channel transmitted through the 2M communication interface plug-in.
2. The intelligent traction network differential protection device applicable to multiple communication interfaces according to claim 1, characterized in that, The switch is a 2-bit dial switch, and the channel for receiving differential data is switched according to the state of the 2-bit dial switch.
3. The intelligent traction network differential protection device applicable to multiple communication interfaces according to claim 2, characterized in that, When the main control module receives the state 01 of the dial switch, the differential data receiving channel is switched to the independent optical fiber channel; when the main control module receives the state 10 of the dial switch, the differential data receiving channel is switched to the data network channel; and when the main control module receives the state 11 of the dial switch, the differential data receiving channel is switched to simultaneously receive the differential data of the independent optical fiber channel and the data network channel.
4. The intelligent traction network differential protection device applicable to multiple communication interfaces according to claim 2, characterized in that, The main control module comprises a state logic processing module, a first switch and a second switch, the state logic processing module is used for triggering the first switch and the second switch to act according to the state of the dial switch, the first switch is used for connecting the main control module with the independent optical fiber channel, and the second switch is used for connecting the main control module with the data network channel.
5. The intelligent traction network differential protection device applicable to multiple communication interfaces according to claim 4, characterized in that, The state judgment module comprises a first logic module, a second logic module and a third logic module, the first logic module is used for triggering the first switch, the second logic module is used for triggering the second switch to act, and the third logic module is used for triggering the first switch and the second switch to act.
6. The intelligent traction network differential protection device applicable to multiple communication interfaces according to claim 5, characterized in that, The first logic module comprises a NOT gate and an AND gate, the second logic module comprises a NOT gate and an AND gate, the third logic module comprises an AND gate, the port 1 and the port 2 of the dial switch are connected respectively, when the state of the port 1 is not connected and the state of the port 2 is connected, the first logic module outputs a high level to trigger the first switch to act, when the state of the port 1 is connected and the state of the port 2 is not connected, the second logic module outputs a high level to trigger the second switch to act, and when the state of the port 1 is connected and the state of the port 2 is connected, the third logic module outputs a high level to trigger the first switch and the second switch to act.
7. The intelligent traction network differential protection device applicable to multiple communication interfaces according to claim 4, characterized in that, The CPU plug-in comprises a fiber interface access device and an optical-electric conversion device, the fiber interface access device is used for receiving differential protection optical signals from an intelligent unit, and the optical-electric conversion device is used for converting the differential protection optical signals into differential protection data, which is uploaded to the main control device through a differential data bus.
8. The intelligent traction network differential protection device applicable to multiple communication interfaces according to claim 1, characterized in that, The 2M communication interface plug-in comprises a 2M coaxial cable interface access device and a digital signal processor, the 2M coaxial cable interface access device is used for receiving data network signals from an intelligent unit, and the digital signal processor is used for decoding the data network signals into differential protection data, which is uploaded to the main control device through a differential data bus.