Distributed grounding backflow monitoring system for railway traction substation

Abstract

A distributed grounding backflow monitoring system for a railway traction substation comprises an indoor equipment subsystem and an outdoor equipment subsystem. The outdoor equipment subsystem is composed of a plurality of centralized grounding box monitoring units and a plurality of voltage and integrity monitoring unit subordinate subsystems. The indoor equipment subsystem is arranged in a standard cabinet and comprises a man-machine interaction unit, a data storage and processing unit and a power supply module; the communication channel is mainly used for providing a channel for communication between subsystems, optical signals are selected, and electric signals can also be adopted. The utility model solves the problems of complex wiring, large work amount and large cable interference, and has the characteristics of convenient installation, modular layout and the like, an outdoor equipment power supply adopts an isolation transformer, a signal setting surge protector or an optical fiber, the safety influence of lightning stroke and overvoltage on indoor equipment is avoided, the overall power of the equipment is relatively large, and a regular polling mechanism is adopted, so that the safety of the equipment is ensured. The power consumption is reduced, the load is balanced, and the power configuration requirement is reduced.

Description

Technical Field

[0001] The utility model relates to the field of monitoring technology equipment, in particular to a distributed ground return current monitoring system for a railway traction substation. Background Art

[0002] Traction return current is a key parameter that reflects the normal operation of the traction power supply system. The grounding device is the fundamental guarantee and important measure to maintain the safe and reliable operation of the traction power supply equipment and to ensure the safety of the operating personnel and electrical equipment. Both play an extremely important role in the stable and reliable operation of the traction power supply system. Therefore, the traction substation is equipped with traction return current and grounding system monitoring equipment to monitor and analyze the return current and grounding data in real time. The traction substation ground return monitoring system mainly measures the traction return current, the ground potential of the pavilion, the step voltage and contact voltage on the high-voltage side, the step voltage and contact voltage on the 27.5kV side, the electrical integrity of the equipment and structure, the soil resistivity and the grounding resistance. At present, the grounding return monitoring system of the traction substation places the main monitoring equipment in the main control room of the traction substation. All measuring lines are introduced through hard wires and share the installation foundation with the secondary equipment in the main control room without electrical isolation. The main problems are as follows: 1. The installation and wiring of the monitoring system are cumbersome. For the traction substation, more than 100 test lines need to be introduced into the main control room of the traction substation. The project volume is huge, the wiring is prone to errors, and the material consumption is high, totaling more than 8 kilometers; 2. The test line path is too long, the earth excavation volume is large, and the test line is easily affected by the strong electromagnetic environment. The wire needs to be buried in the excavation area and placed in a shielding box in the cable trench, which has a high cost; 3. One end of the monitoring system cable is connected to the outdoor equipment or the ground network, and the other end is connected to the monitoring system cabinet in the control room. SPD is installed, but there is still a risk of introducing lightning current and power frequency overcurrent into the control room, which poses a safety hazard to the secondary equipment of the substation. Summary of the invention

[0003] In order to overcome the technical limitations of the existing traction substation ground return current monitoring system and the drawbacks as described in the background, the utility model provides a distributed traction substation ground return current monitoring system, which separates the measurement units and can flexibly arrange the measurement units according to the geographical space characteristics of the monitoring area and the number of monitoring items, effectively reducing the cable usage by 80%, having high anti-interference performance, eliminating the voltage transformer required for voltage collection, improving measurement accuracy, and eliminating the safety hazards of lightning current and power frequency overcurrent introduced into the secondary control system.

[0004] The technical solution adopted by the utility model is:

[0005] A distributed ground return monitoring system for a railway traction substation is characterized in that it includes an indoor equipment subsystem and an outdoor equipment subsystem, data between the indoor equipment subsystem and the outdoor equipment subsystem are communicated through a communication channel, and the power supply is connected through a hard wire; the outdoor equipment subsystem is composed of a plurality of centralized grounding box monitoring units and a plurality of voltage and integrity monitoring unit subordinate subsystems, which are specifically determined according to the distribution of measuring points; the indoor equipment subsystem is connected to the traction substation AC and DC screen through a power line, and is connected to the auxiliary monitoring screen through a data line, the data line is RS485 or RJ45, the indoor equipment subsystem is placed in a standard cabinet, and includes a human-computer interaction unit, a data storage and processing unit, and a power module; the communication channel mainly provides a channel for communication between subsystems, and optical signals are preferably used, and electrical signals can also be used.

[0006] Furthermore, the human-computer interaction unit of the indoor equipment subsystem includes a touch screen, a mouse, and a keyboard to support personnel in reading test data and setting system parameters. The human-computer interaction unit is connected to the power supply through a hard wire, which uses a 3-core power cord, and is connected to the data storage and processing unit through a data cable, which uses a VGA cable, an HDMI cable, a USB cable, or a Type-C cable.

[0007] Furthermore, the data storage and processing unit of the indoor equipment subsystem includes an engineering control computer, which stores the test data in an industrial computer hard disk, uses a built-in algorithm to perform data analysis, and displays it on a human-computer interaction unit. The data storage unit is connected to the processing unit and the human-computer interaction unit via a data cable, the data storage unit is connected to the processing unit and the power supply via a hard wire, and the hard wire uses a 2-core or 3-core power cable, the data storage unit is connected to the processing unit and the photoelectric conversion unit via a data cable, and the data cable is connected using an RJ45 network cable, and the data storage unit is connected to the processing unit and the traction substation auxiliary monitoring system via a data cable, and the data cable uses RS485 or RJ45.

[0008] Furthermore, the power module of the indoor equipment subsystem includes a common power supply and an isolation transformer to supply power to the system equipment. The power module is connected to the AC and DC panels of the traction substation through hard wires, and the hard wires are power lines. The common power supply is connected to the human-computer interaction unit and the data storage and processing unit through hard wires, and is connected to the communication channel through hard wires, and the hard wires are power lines. The isolation transformer is connected to the outdoor equipment subsystem through hard wires.

[0009] Furthermore, the outdoor equipment subsystem is dispersedly arranged in the traction substation pavilion. The centralized grounding box monitoring unit of the outdoor equipment subsystem includes a current transformer, a current monitoring unit, a dehumidification and heating module and a power module. The centralized grounding box monitoring unit collects each return current and transmits the data back to the indoor equipment subsystem. The centralized grounding box monitoring unit is placed in the centralized grounding box of the traction substation to save the test cable. The current transformer adopts a through-type and is installed on the return circuit in the centralized grounding box. The current transformer ratio adopts (200-2000): 1. The current transformer test end is connected to the current monitoring unit through a test line, and the arc transformer power supply is connected to the power module through a hard line, and the hard line adopts a 2-core power line.

[0010] Furthermore, the current monitoring unit of the outdoor equipment subsystem includes a data acquisition card and a shell to complete the data acquisition function. The data acquisition card is developed around the energy management chip. The current monitoring unit is connected to the current transformer through a hard wire, which is a data wire. The current monitoring unit is connected to the communication channel through a data wire, which is an RJ45 network cable or RS485. The current monitoring unit is connected to the power module through a hard wire, which is a 2-core power wire. The dehumidification and heating module is selected as needed to ensure that the humidity and temperature in the outdoor box are suitable for the operation of the centralized grounding box monitoring unit. The dehumidification and heating module is connected to the power module through a hard wire, which is a 2-core power wire. The power module mainly includes a power distribution manager, a rectifier, an air switch, and a surge protector to supply power to each device of the centralized grounding box monitoring unit. The power management board is connected to the isolation transformer of the indoor equipment subsystem.

[0011] Furthermore, the voltage and electrical integrity monitoring unit of the outdoor equipment subsystem is used to collect voltage and electrical integrity quantities, and transmit the data back to the indoor equipment subsystem, including a voltage transformer, a passive monitoring unit, an active detection unit, an electrical integrity detection unit, a dehumidification and heating module and a power supply module. The voltage and electrical integrity monitoring unit collects electrical integrity, 27.5kV side step voltage and contact voltage, ground potential, 110 / 220kV side step voltage and contact voltage, soil resistivity, and ground resistance parameters, and transmits the data back to the indoor equipment subsystem. It can be configured as needed. The voltage and electrical integrity monitoring unit is placed in the centralized grounding box of the traction substation, which can significantly save the use of test cables. The voltage transformer can be optionally installed at the detection point to isolate the measured voltage. The voltage transformer ratio adopts (1-100): 1, and the voltage transformer test end is connected to the passive monitoring unit through a test line.

[0012] Furthermore, the passive monitoring unit of the outdoor equipment subsystem includes a data acquisition card and a shell, which mainly completes the 27.5kV side step voltage, contact voltage, and ground potential data acquisition functions. The data acquisition card is developed around the energy management chip. The passive monitoring unit is connected to the voltage transformer or test point through a hard wire, and the hard wire is a data wire. The passive monitoring unit is connected to the electro-optical conversion module through a data wire, and the data wire is an RJ45 network cable or RS485. The passive monitoring unit is connected to the power module through a hard wire, and the hard wire is a 2-core power wire.

[0013] Furthermore, the active monitoring unit of the outdoor equipment subsystem includes a data acquisition card, a program-controlled AC power supply module and a casing, which mainly completes the 110 / 220kV side step voltage and contact voltage, soil resistivity, and ground resistance data acquisition functions. The data acquisition card is developed around the microcontroller control chip, and the data acquisition card is connected to the program-controlled AC power supply module through a data line, and the data line is RS485. The data acquisition card is connected to the voltage transformer or test point through a hard line, and the hard line is a data line. The data acquisition card is connected to the communication channel through a data line, and the data line is an RJ45 network cable or RS485. The data acquisition card is connected to the power module through a hard line, and the hard line is a 2-core power line. The data acquisition card is connected to the program-controlled AC power supply module through a data line, and the data line is a hard line or an RS485 line. The active monitoring unit is connected to the power module through a hard line, and the hard line is a 2-core power line.

[0014] Furthermore, the electrical integrity detection unit of the outdoor equipment subsystem includes a data acquisition card, a program-controlled DC power supply and a casing, which mainly completes the electrical integrity test of the casing and architecture of the main equipment of the pavilion. The data acquisition card is developed around the microcontroller control chip, and the data acquisition card is connected to the program-controlled DC power supply module through a data line, which is RS485. The data acquisition card is connected to the communication channel through a data line, which is an RJ45 network cable or RS485. The electrical integrity detection unit is connected to the power supply module through a hard line, which is a 2-core power line. The dehumidification and heating module can be selected as needed, mainly to ensure that the humidity and temperature in the outdoor box are suitable for the operation of the centralized grounding box monitoring unit. The dehumidification and heating module is connected to the power supply module through a hard line, which is a 2-core power line. The power supply module is mainly composed of a surge protector, a power distribution manager and a rectifier, which supplies power to the voltage and various devices in the electrical integrity monitoring unit, and the power supply module is connected to the isolation transformer of the indoor equipment subsystem.

[0015] Furthermore, when the communication channel adopts optical signals, the communication channel is composed of an optical fiber switch, an optoelectronic converter, optical fiber, and an electro-optical converter. The optical fiber switch is connected to the electro-optical converter installed on the outdoor equipment subsystem side through optical fiber. The optoelectronic converter is installed in front of the data storage and processing unit of the indoor equipment subsystem to convert the optical signal into an electrical signal that can be processed by the data storage and processing unit. When electrical signals are adopted, the communication channel is composed of a switch, a surge protector, a data line, and an outdoor box surge protector. The switch is connected to the outdoor equipment subsystem through a data line, and the data line is a network cable or RS485. The surge protector is installed on both sides of the data line to protect the equipment from lightning strikes or overcurrent.

[0016] Furthermore, the human-computer interaction unit displays test data and configures collection monitoring parameters, such as frequency and time. The configuration information is saved in the data storage and processing unit. The centralized grounding box monitoring unit adopts real-time monitoring and continuously transmits the measurement data to the data storage and processing unit through the communication channel. The voltage and electrical integrity monitoring unit adopts a polling system. After the data storage and processing unit sends a detection signal, the voltage and electrical integrity monitoring unit starts to collect data and upload it to the data storage and processing unit.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the utility model arranges the monitoring equipment near the monitoring point, and all measuring cables are connected to the nearest outdoor monitoring box. The monitoring box can be flexibly configured according to the situation of the on-site traction substation, which greatly reduces the amount of cables compared to the original centralized system solution, solves the problems of complex wiring, large engineering workload and large cable interference, and has the characteristics of easy installation and modular layout. The power supply of outdoor equipment uses an isolation transformer, and the signal is equipped with a surge protector or optical fiber to avoid the safety impact of lightning strikes and overvoltage on indoor equipment. The measurement of electrical integrity, high-voltage side contact voltage and step voltage requires an active power supply, and the overall power of the equipment is relatively large. A periodic polling mechanism is used to reduce power consumption, balance the load, and reduce power supply configuration requirements. In summary, the present application has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system block diagram of the utility model.

[0019] Figure 2 This is a block diagram of the indoor equipment subsystem in the utility model.

[0020] Figure 3 This is a block diagram of the outdoor equipment subsystem in the utility model.

[0021] Figure 4 This is a communication channel block diagram when the utility model adopts optical signals.

[0022] Figure 5It is the layout diagram of embodiment 1 of the utility model. DETAILED DESCRIPTION

[0023] Figure 1 , 2 , 3, 4, and 5, Example 1: A distributed grounding return current monitoring system for a railway traction substation, including an indoor equipment subsystem (1) and an outdoor equipment subsystem (2), data between the subsystems is communicated through a communication channel (3), and the power supply is connected through a hard line (4); the outdoor equipment subsystem is composed of a lower-level system consisting of a centralized grounding box monitoring unit (201) and two voltage and integrity monitoring units (202, 203, 204), the centralized grounding box monitoring unit (201, 203) is placed in the centralized grounding box, the voltage and integrity monitoring unit (202) is placed on the 110kV incoming line side, and the voltage and integrity monitoring unit (204) is placed in the middle of the 27.5kV outgoing line side. The indoor equipment subsystem is connected to the traction substation AC and DC panel through a power line, and is connected to the auxiliary monitoring panel through a data line, the data line is an RJ45 network cable, and the system layout is as follows Figure 1 shown.

[0024] Figure 1 , 2As shown in , 3, 4, and 5, the indoor equipment subsystem is placed in a standard cabinet (100) with a size of 600*800*2240 mm, including a human-machine interaction unit (101), a data storage and processing unit (102), and a power module (103). The human-machine interaction unit (101) includes a touch screen (1011), and the touch screen (1011) uses Advantech FPM-1150G-RHAE; the human-machine interaction unit is connected to the power supply through a hard wire, which uses a 3-core power cord, and is connected to the data storage and processing unit through a data cable, which uses an HDMI cable and a USB cable. The data storage and processing unit (102) mainly includes an engineering control computer (1021), which uses Advantech UNO-2484G to store the test data in the hard disk of the industrial computer (1021), and uses the built-in algorithm to perform data analysis and display it on the human-computer interaction unit; the data storage unit is connected to the processing unit (102) and the human-computer interaction unit (101) Advantech FPM-1150G-RHAE through an HDMI cable and a USB cable; the data storage unit is connected to the processing unit (102) and the power supply through a 3-core power cable; the data storage unit is connected to the processing unit (102) and the photoelectric conversion unit (103) through a data cable; the data cable can be connected using an RJ45 network cable; the data storage unit and the processing unit (102) are connected to the auxiliary monitoring system (screen) of the traction substation through a data cable, and the data cable uses RS485 or RJ45. The power module (103) mainly includes a common power supply (1031), an isolation transformer (1032), etc., which supply power to the system equipment; the power module (103) adopts the Bull GN-316, and is connected to the AC and DC screen of the traction substation through a 3-core power line; the common power supply (1031) is connected to the human-machine interaction unit (101) and the data storage and processing unit (102) through a hard line, and is connected to the communication channel (3) through a hard line, and the hard line is a power line; the isolation transformer (1032) selects a 3kVA dry-type isolation transformer, and is connected to the outdoor equipment subsystem (2) through a hard line. The centralized grounding box monitoring unit (201) comprises a current transformer (2011), a current monitoring unit (2012), a dehumidification and heating module (2013) and a power module (2014); the current monitoring unit (2012) and the power module (2014) in the centralized grounding box monitoring unit (201) adopt EDRI-400-HL, the core chip is ATT7053, and the dehumidification and heating module adopts HGM050-200W; the current transformer (2011) adopts a through-type, and the transformation ratio is 200:1.

[0025] Figure 1 , 2As shown in , 3, 4, and 5, the voltage and electrical integrity monitoring unit (202) of the embodiment includes a passive monitoring unit (2022), an active detection unit (2023), an electrical integrity detection unit (2024), a dehumidification and heating module (2025), and a power module (2026); this embodiment does not have a voltage transformer; the passive monitoring unit (2022) adopts EDRI-400-JC, and the core chip is ATT7053; the active detection unit (2023) adopts EDRI-400-TD, and the core chips are STM32 and ATT7053; the electrical integrity detection unit (2024) adopts EDRI-400-WZ, and the core chip is STM32. The dehumidification and heating module (2025) adopts HGM050-200W; the power module is a 1kW switching power supply. The voltage and electrical integrity monitoring unit (203) of the embodiment is equipped with an electrical integrity detection unit (2024), the dehumidification and heating module (2024) adopts HGM050-200W, and the power supply (2026) is a 500W switching power supply. The voltage and electrical integrity monitoring unit (204) of the embodiment includes a passive monitoring unit (2022), an electrical integrity detection unit (2024), a dehumidification and heating module (2025) and a power supply module (2026). The dehumidification and heating module (2025) adopts HGM050-200W. The power supply module (2026) is a 500W switching power supply. The optical fiber switch (301) in the communication channel (3) adopts MOXA EDS-205-A-SC; the photoelectric converter (302) and the electro-optical converter (304) adopt MOXA IMC-21-M-SC; the optical fiber (303) adopts SC-SC optical fiber. The optical fiber switch (301) and the photoelectric converter (302) are placed in an indoor cabinet (100) and powered by a common power supply. The electro-optical converter (304) is placed in an outdoor box and powered by the power supply in the box.

[0026] Figure 1 , 2 As shown in Figures 3, 4, and 5, through all the above technical solutions, the utility model arranges the monitoring equipment near the monitoring point, and all measuring cables are connected to the nearest outdoor monitoring box. The monitoring box can be flexibly configured according to the situation of the on-site traction substation, which greatly reduces the amount of cables compared to the original centralized system solution, solves the problems of complex wiring, large engineering workload, and large cable interference, and has the characteristics of easy installation and modular layout. The power supply of outdoor equipment uses an isolation transformer, and the signal is equipped with a surge protector or optical fiber to avoid the safety impact of lightning strikes and overvoltage on indoor equipment. The measurement of electrical integrity, high-voltage side contact voltage and step voltage requires an active power supply, and the overall power of the equipment is relatively large. A regular polling mechanism is used to reduce power consumption, balance the load, and reduce power supply configuration requirements.

[0027] It should be understood that although the present specification is described according to the implementation mode, the implementation mode does not only include an independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A distributed ground return current monitoring system for railway traction substation, characterized in that: The invention comprises an indoor equipment subsystem (1) and an outdoor equipment subsystem (2), wherein data between the two subsystems is communicated via a communication channel (3), and the power supply is connected via a hard line (4); the outdoor equipment subsystem is composed of a plurality of centralized grounding box monitoring units (201) and a plurality of voltage and integrity monitoring units (202) as subordinate subsystems, which are specifically determined according to the distribution of measuring points; the indoor equipment subsystem is connected to the AC and DC panels of the traction substation via a power line, and is connected to the auxiliary monitoring panel via a data line, and the data line is RS485 or RJ45; the indoor equipment subsystem is placed in a standard cabinet (100), and comprises a human-computer interaction unit (101), a data storage and processing unit (102), and a power module (103).

2. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The human-machine interaction unit (101) of the indoor equipment subsystem includes a touch screen (1011), a mouse (1012), and a keyboard (1013), which supports personnel to read test data and set subsystem parameters. The human-machine interaction unit is connected to a power source via a hard line, and is connected to a data storage and processing unit via a data line. The data storage and processing unit (102) includes an industrial computer (1021), which implements centralized storage of test data in a hard disk of the industrial computer (1021), and uses a built-in algorithm to perform data analysis and display it on the human-machine interaction unit. The data storage unit is connected to the processing unit (102) and the human-machine interaction unit (101) via a data line, the data storage unit is connected to the processing unit (102) and the power source via a hard line, the data storage unit is connected to the processing unit (102) via a data line, and the data storage unit is connected to the processing unit (102) and the auxiliary monitoring system of the traction substation via a data line.

3. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The power module (103) of the indoor equipment subsystem includes a common power supply (1031) and an isolation transformer (1032) to supply power to the subsystem equipment. The power module (103) is connected to the AC / DC panel of the traction substation via hard wires. The common power supply (1031) is connected to the human-machine interaction unit (101) and the data storage and processing unit (102) via hard wires, and is connected to the communication channel (3) via hard wires. The isolation transformer (1032) is connected to the outdoor equipment subsystem (2) via hard wires.

4. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The outdoor equipment subsystem (2) is dispersedly arranged in the traction substation booth; the centralized grounding box monitoring unit (201) comprises a current transformer (2011), a current monitoring unit (2012), a dehumidification and heating module (2013) and a power module A (2014); the centralized grounding box monitoring unit (201) collects each return current and transmits the data back to the indoor equipment subsystem (1); the centralized grounding box monitoring unit (201) is placed in the centralized grounding box of the traction substation, which significantly saves the amount of test cables; the current transformer (2011) is of a through-type and is mounted on the return circuit in the centralized grounding box; the current The test end of the transformer (2011) is connected to the current monitoring unit (2012) via a test line, and the power supply of the current transformer (2011) is connected to the power module A (2014) via a hard line; the current monitoring unit (2012) comprises a data acquisition card and a shell, and mainly performs a data acquisition function. The data acquisition card is developed around an energy management chip. The current monitoring unit (2012) is connected to the current transformer (2011) via a hard line, the current monitoring unit (2012) is connected to the communication channel (3) via a data line, and the current monitoring unit (2012) is connected to the power module A (2014) via a hard line.

5. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The dehumidification and heating module (2013) of the outdoor equipment subsystem (2) is selected as needed to ensure that the humidity and temperature in the outdoor box are suitable for the operation of the centralized grounding box monitoring unit (201). The dehumidification and heating module (2013) is connected to the power module A (2014) via a hard line; the power module A (2014) includes a power distribution manager, a rectifier, an air switch, and a surge protector, and supplies power to various devices of the centralized grounding box monitoring unit (201). The power management board is connected to the isolation transformer (1032) of the indoor equipment subsystem (1).

6. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The voltage and integrity monitoring unit (202) of the outdoor equipment subsystem (2) is used to collect voltage and electrical integrity data and transmit the data back to the indoor equipment subsystem (1). The voltage and integrity monitoring unit (202) includes a voltage transformer (2021), a passive monitoring unit (2022), an active monitoring unit (2023), an electrical integrity detection unit (2024), a dehumidification and heating module (2013) and a power module B (2026). The voltage and integrity monitoring unit (202) mainly collects electrical integrity, 27.5 kV The side step voltage and contact voltage, ground potential, 110 / 220kV side step voltage and contact voltage, soil resistivity, ground resistance parameters, and the data are transmitted back to the indoor equipment subsystem (1), which is configured as needed. The voltage and integrity monitoring unit (202) is placed in the centralized grounding box of the traction substation to save the amount of test cables. The voltage transformer (2021) is installed at the detection point to isolate the measured voltage. The test end of the voltage transformer (2021) is connected to the passive monitoring unit (2022) through a test line.

7. A railway traction substation distributed ground return current monitoring system according to claim 6, characterized in that: The passive monitoring unit (222) of the outdoor equipment subsystem (2) includes a data acquisition card and a housing, and mainly completes the 27.5kV side step voltage and contact voltage, ground potential data acquisition functions. The data acquisition card is developed around the energy management chip. The passive monitoring unit is connected to the voltage transformer or test point through a hard line, the passive monitoring unit is connected to the electro-optical conversion module through a data line, and the passive monitoring unit (2022) is connected to the power module C (2027) through a hard line. The active monitoring unit (2023) includes a data acquisition card, a program-controlled AC power module and a housing, and mainly completes the 110 / 220 kV side step voltage and contact voltage, soil resistivity, ground resistance data acquisition function, the data acquisition card is developed around the micro control unit control chip, the data acquisition card is connected to the program-controlled AC power module through a data line, the data acquisition card is connected to the voltage transformer or test point through a hard line, the data acquisition card is connected to the communication channel (3) through a data line, the data acquisition card is connected to the power module C (2027) through a hard line, the data acquisition card is connected to the program-controlled AC power module through a data line, and the active monitoring unit (223) is connected to the power module C (2027) through a hard line.

8. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The electrical integrity detection unit (24) of the outdoor equipment subsystem (2) includes a data acquisition card, a program-controlled DC power supply and a housing, and mainly completes the electrical integrity measurement of the housing and structure of the main equipment of the pavilion. The data acquisition card is developed around the microcontroller control chip. The data acquisition card is connected to the program-controlled DC power supply module via a data line. The data acquisition card is connected to the communication channel (3) via a data line. The electrical integrity detection unit (224) is connected to the power module C (2027) via a hard line. The dehumidification and heating module (2013) is selected as needed, and mainly ensures that the humidity and temperature in the outdoor box are suitable for the operation of the centralized grounding box monitoring unit (201). The dehumidification and heating module (2013) is connected to the power module C (227) via a hard line. The power module C (227) is mainly composed of a surge protector, a power distribution manager and a rectifier, and supplies power to various devices in the voltage and integrity monitoring unit (202). The power module C (227) is connected to the isolation transformer (1032) of the indoor equipment subsystem (1).

9. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The communication channel (3) mainly provides a channel for communication between subsystems. Optical signals are selected, and electrical signals can also be used. When optical signals are used, the communication channel (3) is composed of an optical fiber switch (301), an optical-electrical converter (302), an optical fiber (303), and an electro-optical converter (304). The optical fiber switch (301) is connected to the electro-optical converter (304) installed on the side of the outdoor equipment subsystem (2) through the optical fiber (303). The optical-electrical converter is installed in front of the data storage and processing unit (102) of the indoor equipment subsystem (1). , converting the optical signal into an electrical signal that can be processed by the data storage and processing unit (102); when the communication channel (3) uses an electrical signal, the communication channel (3) is composed of an optical fiber switch (301), a surge protector (3021), a data line (3031), and an outdoor cabinet surge protector (3041); the switch (301) is connected to the outdoor equipment subsystem (2) via the data line (3031); the surge protector (3021) is installed on both sides of the data line to protect the equipment from lightning strikes or overcurrent.

10. A railway traction substation distributed ground return current monitoring system according to claim 1, characterized in that: The human-computer interaction unit (101) displays test data, configures acquisition monitoring parameters, such as frequency and time, and stores the configuration information in the data storage and processing unit (102). The centralized grounding box monitoring unit (201) uses real-time monitoring to continuously transmit measurement data to the data storage and processing unit (102) through the communication channel (3). The voltage and integrity monitoring unit (202) uses a polling system. After the data storage and processing unit (102) sends a detection signal, the voltage and integrity monitoring unit (202) starts to collect data and uploads it to the data storage and processing unit (102).

Images