CN211979164U

CN211979164U - Comprehensive grounding on-line detection system applied to railway traction substation

Info

Publication number: CN211979164U
Application number: CN202020363688.0U
Authority: CN
Inventors: 陈兴强; 魏建忠; 李波; 张涛; 刘通; 何秋泠; 苏堤; 苏燕舞; 顾立新; 刘伟迪; 谢晨娟; 侯东光
Original assignee: China Railway Design Corp
Current assignee: China Railway Design Corp
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-11-20
Anticipated expiration: 2030-03-20

Abstract

The utility model discloses an use comprehensive ground connection on-line measuring system at railway traction substation, include, traction substation synthesizes the ground connection and monitors the screen cabinet on line and the soil resistivity monitoring case, the voltage monitoring case that strides, contact voltage monitoring case, electrical integrity monitoring case, ground resistance monitoring case and the ground net backward flow monitoring case that is connected with traction substation synthesizes the ground connection and monitors the screen cabinet on line respectively. The intelligent integrated grounding on-line monitoring system has the advantages that the intelligent integrated grounding on-line monitoring system is formed by communicating the communication module with the monitoring center upper computer to display various monitoring results and alarm information in real time, the on-line monitoring function of multiple grounding parameters such as integrated soil resistivity, step voltage, contact voltage, electrical integrity, grounding resistance and grounding grid backflow is realized, the condition of the grounding system is reflected in an all-round mode, and the integrated monitoring effect is improved.

Description

Comprehensive grounding on-line detection system applied to railway traction substation

Technical Field

The utility model relates to a railway integrated system ground system measures, concretely relates to use comprehensive ground connection on-line measuring system at railway traction substation.

Background

The railway comprehensive grounding system is a grounding system which integrates devices needing grounding, such as a traction power supply backflow system, an electric power supply system, a signal system, a communication and other electronic information system, a building, a ballast bed, a platform, a bridge, a tunnel, a sound barrier and the like along the railway into a whole by penetrating through a grounding wire, and is a net-shaped grounding device with functions of drainage and voltage sharing.

At present, with the high-speed development of electrified railway networks in China, railways become main transportation modes and main freight tools for people to go out, and the safety of the railways is of great importance; higher requirements are also put forward on the safety of power systems such as a railway integrated system grounding system and the like.

Chinese patent CN2019202005506 discloses a ground resistance detector, which is convenient for railway constructors or maintenance personnel to quickly detect the ground resistance of a grounding device, so as to find and process abnormality in time and ensure the safety of a railway system. At present, an integrated grounding on-line detection system applied to a railway traction substation is lacked, and safety protection is carried out on a railway integrated system grounding system.

Disclosure of Invention

The utility model aims to solve the technical problem that an use comprehensive ground connection on-line measuring system at railway traction substation is provided.

The utility model discloses the technical scheme who adopts is, an use comprehensive ground connection on-line measuring system at railway traction substation, include that traction substation synthesizes the ground connection on-line monitoring screen cabinet and the soil resistivity monitoring case, stride voltage monitoring case, contact voltage monitoring case, electrical integrity monitoring case, ground resistance monitoring case and the ground net backward flow monitoring case that are connected with traction substation synthesizes the ground connection on-line monitoring screen cabinet respectively.

The comprehensive grounding on-line monitoring screen cabinet of the traction substation comprises a display module, an intelligent module and a communication module; the display module and the communication module are both connected with the intelligent module; the soil resistivity monitoring box, the stepping voltage monitoring box, the contact voltage monitoring box, the electrical integrity monitoring box, the grounding resistance monitoring box and the ground network backflow monitoring box are respectively connected with the intelligent module.

The intelligent control system also comprises a temperature sensor and a humidity sensor which are connected with the intelligent module.

The intelligent door control system further comprises an entrance guard control device and a pyroelectric infrared sensor which are connected with the intelligent module.

The ground grid backflow monitoring box comprises a backflow detection terminal and a sensor which are arranged at an outer test point of the traction substation comprehensive grounding on-line monitoring screen cabinet; and the backflow detection terminal and the sensor are connected to a comprehensive grounded online monitoring screen cabinet of the traction substation through an AC220V power line and a 485 bus.

The grounding resistance monitoring box is connected with an auxiliary grounding electrode through a detection wiring; the auxiliary grounding electrode comprises a voltage electrode and a current electrode, the grounding resistance monitoring box is provided with 3 test points, the 3 test points respectively select equipotential busbars of a control room and a transformer room and outdoor points to be monitored, the 3 test points share the voltage electrode and the current electrode, and switching operation is carried out through a switch; the soil resistivity monitoring box is provided with 4 test points through a detection wiring, the 4 test points are distributed on a straight line, and the distances between the adjacent test points are the same; two test points at two sides are provided with current poles, and two test points in the middle are provided with voltage poles; the distance between adjacent test points is more than or equal to 100 meters, and the distance between each test point electrode and the railway roadbed is not less than 100 meters.

The step voltage monitoring box and the contact voltage monitoring box are connected with a first current pole, a second current pole, a first voltage pole, a second voltage pole, a third voltage pole and a fourth voltage pole through detection wiring; the first voltage pole and the second voltage pole are used for contact voltage testing, the third voltage pole and the fourth voltage pole are used for step voltage testing, and the first current pole and the second current pole are a pair of current poles shared in step voltage and contact voltage testing.

The electrical integrity monitoring box is connected with the first testing pole, the second testing pole, the third testing pole, the fourth testing pole and the fifth testing pole through the detection wiring; the first test electrode is connected to a grounding terminal connected with the comprehensive grounding system and used as a reference point; the second test pole, the third test pole, the fourth test pole and the fifth test pole are connected to a point connected with the comprehensive grounding system, and the distance between the second test pole and the first test pole is less than or equal to 300 meters.

The comprehensive grounding on-line monitoring screen cabinet of the traction substation is in communication connection with the monitoring center upper computer through the communication module; the communication module is at least one of an RS485 interface, an RS232 interface, a USB interface, a network port and a ZigBee wireless module.

The intelligent module adopts an STM32F103VGT6 chip, the communication module adopts an ADM2483BRWZ chip in RS485, and the STM32F103VGT6 chip is connected with the ADM2483BRWZ chip through a USART interface; the temperature sensor and the humidity sensor adopt a temperature and humidity composite sensor DHT11, and the temperature and humidity composite sensor DHT11 is connected with the STM32F103VGT6 chip; the access control device comprises an STC89C52 single chip microcomputer, an FM-180 fingerprint identification module, an LCD1602 liquid crystal display, an electronic lock access control circuit, a clock circuit DS1302 and a key circuit; the STC89C52 single chip microcomputer and the STM32F103VGT6 chip are connected through NRF24L01 to achieve radio frequency communication; the pyroelectric infrared sensor adopts a PD632 chip, and the PD632 chip is connected with the STM32F103VGT6 chip.

The beneficial effects of the utility model are that, through communication module and surveillance center host computer communication, constitute the online monitored control system of intelligent integrated ground connection and show each monitoring result in real time and report an emergency and ask for help or increased vigilance information, realize realizing the on-line monitoring function to a plurality of ground connection parameters such as the soil resistivity of integration, step voltage, contact voltage, electric integrality, ground resistance, ground net backward flow, all-round reflection ground connection system situation promotes the comprehensive monitoring effect.

Drawings

FIG. 1 is a topological diagram of the comprehensive grounding on-line detection system of the present invention;

FIG. 2 is a block diagram of the comprehensive grounding on-line detection system of the present invention;

fig. 3 is a schematic diagram of the ground resistance monitoring box of the integrated ground on-line detection system of the present invention connecting the auxiliary grounding electrode through the detection wiring;

FIG. 4 is a schematic diagram of the soil resistivity monitoring box of the integrated grounding on-line detection system of the present invention, which sets the layout of the test points through the detection wiring;

FIG. 5 is a schematic diagram of the step voltage monitoring box and the contact voltage monitoring box of the integrated grounding on-line detection system of the present invention, showing the layout of the test points through the detection wiring;

FIG. 6 is a schematic diagram of the electrical integrity monitoring box of the integrated grounding on-line detection system of the present invention, which sets the layout of the test points through the detection wiring;

FIG. 7 is a block diagram of the comprehensive grounding on-line detection system of the present invention;

FIG. 8 is a block diagram of the comprehensive grounding on-line detection system of the present invention;

FIG. 9 is a circuit diagram of the intelligent module of the integrated grounding on-line detection system of the present invention;

fig. 10 is a circuit diagram of a power module of the integrated grounding on-line detection system of the present invention;

fig. 11 is a circuit diagram of a display module of the integrated grounding on-line detection system of the present invention;

fig. 12 is a circuit diagram of a communication module of the integrated grounding on-line detection system of the present invention;

fig. 13 is a circuit diagram of the analog signal processing unit of the integrated grounding on-line detection system of the present invention;

fig. 14 is a circuit diagram of an entrance guard control module of the integrated grounding on-line detection system of the present invention;

fig. 15 is a block diagram of the integrated grounding on-line detection system of the present invention.

Detailed Description

The invention will be described in further detail with reference to the following drawings and embodiments:

the comprehensive grounding on-line monitoring screen cabinet of the traction substation adopts a cabinet mode, monitors the soil resistivity, the step voltage, the contact voltage, the electrical integrity and the grounding resistance of the important equipment side of the main transformer in real time, gives corresponding alarms when the outgoing line is in an abnormal state or the data exceeds the limit, and provides specific abnormal information.

As shown in fig. 1 and fig. 2, the utility model relates to an use comprehensive ground connection on-line measuring system at railway traction substation, include, traction substation synthesizes the online monitoring screen cabinet of ground connection and the soil resistivity monitoring case, the step voltage monitoring case, contact voltage monitoring case, electric integrality monitoring case, ground resistance monitoring case and the ground net backward flow monitoring case of being connected with traction substation synthesizes the online monitoring screen cabinet respectively.

As shown in fig. 2, the comprehensive grounded on-line monitoring screen cabinet of the traction substation comprises a display module, an intelligent module and a communication module; the intelligent module adopts an STM32F103VGT6 chip, the communication module adopts RS485, the RS485 adopts an ADM2483BRWZ chip, and the STM32F103VGT6 chip is connected with the ADM2483BRWZ chip through a USART interface; the display module and the communication module are connected with the intelligent module, and can monitor the grounding resistance value and the change condition of the grounding grid of the traction substation in real time and send an alarm when the change of the grounding resistance exceeds a limit value; the soil resistivity monitoring box, the stepping voltage monitoring box, the contact voltage monitoring box, the electrical integrity monitoring box, the grounding resistance monitoring box and the ground network backflow monitoring box are respectively connected with the intelligent module.

Detecting the backflow condition of the ground network, and sending an alarm when the backflow ratio of a backflow line is too low; monitoring the step voltage and the contact voltage of equipment sides such as a main transformer and the like, and giving an alarm when the step voltage and the contact voltage exceed the limit; monitoring electrical integrity at the primary device; and monitoring whether the resistivity of the soil is qualified or not. The product has high measurement precision and accurate and reliable test data; the anti-interference capability is strong, the safety of the test is ensured, and the normal operation of other systems and equipment in the traction substation cannot be influenced during the detection; the on-line detection system reflects the condition of the grounding system in an all-round way, improves the comprehensive monitoring effect, and can communicate with the monitoring center through the communication module to form an intelligent comprehensive grounding on-line monitoring system to display various monitoring results and alarm in real time. The communication module is at least one of an RS485 interface, an RS232 interface, a USB interface, a network port and a ZigBee wireless module. And various communication modules can be adopted simultaneously to realize communication with an upper computer.

As shown in fig. 7, the intelligent control system further comprises a temperature sensor and a humidity sensor connected with the intelligent module; the temperature sensor and the humidity sensor adopt a temperature and humidity composite sensor DHT11, the temperature and humidity composite sensor DHT11 is connected with an STM32F103VGT6 chip, the temperature and humidity composite sensor DHT11 realizes the connection of analog signal processing and an STM32F103VGT6 chip through an analog signal processing unit, the analog signal processing unit is respectively connected with a 52 pin of a microprocessor STM32F103VGT6 chip through an RSDA interface and is connected with a 51 pin of the STM32F103VGT6 chip through a TSDA interface; the temperature and humidity compound sensor DHT11 can also be in data communication with the intelligent module by adopting a single-wire system serial interface. The DHT11 has the characteristics of wide measurement range (0-50 ℃, 20-90% RH), high response speed, strong anti-interference capability and the like, and can meet the requirements of air temperature and humidity acquisition of a railway traction substation on a sensor.

As shown in fig. 8 and 14, the door access control device further includes an access control module and a pyroelectric infrared sensor connected to the intelligent module; the entrance guard control device comprises an STC89C52 single chip microcomputer, an FM-180 fingerprint identification module, an LCD1602 liquid crystal display, an electronic lock entrance guard circuit, a clock circuit DS1302 and a key circuit and is used for entrance guard management of a traction substation.

The STC89C52 single chip microcomputer is a control core of the access control device and is mainly used for fingerprint identification control, display control, key control, electronic lock on-off control and radio frequency communication control. The FM-180 fingerprint identification module mainly comprises a fingerprint acquisition head and a fingerprint processing circuit, wherein the fingerprint acquisition head uses an optical fingerprint sensor, and the fingerprint processing circuit comprises a high-performance DSP processor, a FLASH and other chips. The LCD1602 LCD is a display tool for fingerprint collection, identification, deletion, sorting, entry time, etc. The electronic lock entrance guard circuit mainly comprises a relay drive circuit and an electronic lock switch circuit, an electronic lock with 12V power supply voltage is adopted during design, and the electronic lock can be powered on to unlock when the voltage of two ends of an electronic lock coil reaches 12V.

Radio frequency communication connection is realized between the STC89C52 singlechip and the STM32F103VGT6 chip through NRF24L 01. The FM-180 and the STC89C52 perform data communication through the serial ports P3.0 and P3.1 of the single chip microcomputer, complete operations such as fingerprint input, deletion, comparison and the like according to the command of a user, encrypt the fingerprint characteristic value and store the encrypted fingerprint characteristic value in the FLASH of the FM-180. NRF24L01 is a single chip integrated radio frequency transceiver, works in ISM frequency channel of 2.4 ~ 2.5 GHz, adopts SPI bus mode to carry out data communication with the singlechip, utilizes the P3 mouth of STC89C52 to simulate SPI communication protocol through software programming to realize the control to NFF24L 01.

The fingerprint identification control part comprises four keys of S2, S3, S4 and S5, wherein S2 is defined as a mode identification conversion key and is used for switching between fingerprint identification and fingerprint input, S3 is defined as a fingerprint input key, when the system is in a fingerprint input mode, S3 is pressed to carry out fingerprint input work once, S4 is defined as a fingerprint clearing key and is used for clearing fingerprint characteristics in a fingerprint identification module Flash library, and S5 is defined as an indoor one-key door opening key, and an electronic lock can be prohibited to open through the keys. STC89C52 reads and writes the clock chip DS1302 through P2.1, P2.2 and P2.3, and the clock adjustment is realized through keys S6, S7 and S8. Wherein S6 is defined as an adjustment selection key, and the adjustment can be switched among year, month, day, hour, minute, second and week by pressing the key; the keys S7 and S8 are defined as the 1 plus key and the 1 minus key of the number respectively, and the 1 plus or the 1 minus operation can be carried out on the number through the two keys.

The pyroelectric infrared sensor adopts a PD632 chip, and the PD632 chip is connected with an STM32F103VGT6 chip. The pyroelectric infrared sensor PD632 is a sensor which detects infrared radiation by utilizing the characteristic that the polarization of a pyroelectric material changes along with the temperature so as to sense the approach or the distance of a human body, and has the working wavelength of 7.5-14.0 mu m, the working voltage of 2.2-15.0V and the working current of 8.0-24 mu A. The BIS0001 is adopted to complete the processing of the output signal of the PD632 during design, when the detection range is occupied, the output pin of the BIS0001 is at a high level, and when the detection range is not occupied, the output pin of the BIS0001 is at a low level. The STM32F103ZET6 determines whether a person enters a warning zone by the high and low levels of the input port connected to BIS 0001.

STM32F103ZET6 microprocessor's powerful function, 2.4 GHz radio frequency communication and transmission performance, cooperation temperature, humidity composite sensor DHT11 and entrance guard control device have realized functions such as traction substation entrance guard control, traction substation internal environment parameter detection, traction substation warning.

As shown in fig. 3, the ground grid backflow monitoring box includes a backflow detection terminal and a sensor which are arranged at the test point outside the traction substation comprehensive grounding on-line monitoring screen cabinet; receiving and displaying monitoring data of the ground network backflow monitoring box, performing abnormal alarm according to the proportion of the monitoring data in total backflow, and connecting the backflow detection terminal and the sensor to a comprehensive grounding online monitoring screen cabinet of the traction substation through an AC220V power line and a 485 bus.

As shown in fig. 3, the ground resistance monitoring box is connected to the auxiliary ground electrode through a detection wiring; the auxiliary grounding electrode comprises a voltage electrode and a current electrode, the grounding resistance monitoring box is provided with 3 test points, the 3 test points respectively select equipotential busbars of a control room and a transformer room and outdoor points to be monitored, the 3 test points share the voltage electrode and the current electrode, and switching operation is carried out through a switch; sharing the voltage pole and the current pole saves cost, and reduces errors caused by testing by replacing the voltage pole and the current pole.

As shown in fig. 4, the soil resistivity monitoring box is provided with 4 test points through a detection wiring, the 4 test points are distributed on a straight line, and the distances between the adjacent test points are the same; two test points at two sides are provided with current poles, and two test points in the middle are provided with voltage poles; the distance between adjacent test points is more than or equal to 100 meters and as large as possible, the space scale of a common substation is dozens of meters, and the test points possibly need to be connected outside the range of the substation; the distance between each test point electrode and the railway subgrade is not less than 100 meters. The test electrodes are suitably remote from the ground body, buried conductor.

As shown in fig. 5, the step voltage monitoring box and the contact voltage monitoring box are connected to a first current pole, a second current pole, a first voltage pole, a second voltage pole, a third voltage pole and a fourth voltage pole through detection wires; the first voltage pole and the second voltage pole are used for contact voltage testing, the third voltage pole and the fourth voltage pole are used for step voltage testing, and the first current pole and the second current pole are a pair of current poles shared in step voltage and contact voltage testing.

The first current pole is connected with a transformer metal shell connected with the railway comprehensive grounding network, and the height of the first current pole is not less than 1.8 m; the second current pole distance through ground should be greater than 400 meters. The first voltage pole is connected with a transformer metal shell connected with a through ground wire, and the height of the first voltage pole is 1.8 m; the second voltage pole is arranged beside the transformer and is horizontally spaced from a grounding body below the transformer by 1 meter. The distance between the third voltage pole and the fourth voltage pole is 1 meter, and the distance between the third voltage pole and the fourth voltage pole and the grounding body under the transformer is not too far.

As shown in fig. 6, the electrical integrity monitoring box is connected to the first test pole, the second test pole, the third test pole, the fourth test pole and the fifth test pole through the detection wiring; the first test electrode is connected to a grounding terminal connected with the comprehensive grounding system and used as a reference point; the second test pole, the third test pole, the fourth test pole and the fifth test pole are connected to a point connected with the comprehensive grounding system, and the distance between the second test pole and the first test pole is less than or equal to 300 meters. The first, second, third, fourth, and fifth test poles may be disposed on the transformer housing.

And (3) measuring by adopting a four-terminal method, and judging the electrical integrity by measuring the direct current resistance between the measuring point and the reference point.

The electrical integrity measurement result is judged and processed by the following method:

a. the measured value of the direct current resistance between the grounding measurement point of the equipment or the cable with good connection state and the reference point is below 50m omega;

b. if the measured value of the direct current resistance between the grounding measuring point of the equipment or the cable and the reference point is between 50m omega and 200m omega, the connection state of the equipment or the cable is reflected, the change of the equipment or the cable is preferably concerned in the routine measurement in the future, and the important equipment or the cable is checked and processed at proper time;

c. if the direct current resistance measured value between the equipment or cable grounding measuring point and the reference point is 200m omega-1 omega, the connection state of the equipment or cable is not good, important equipment or cable is treated by checking as soon as possible, and other equipment or cable is treated by checking at proper time;

d. if the measured value of the direct current resistance between the grounding measuring point of the equipment or the cable and the reference point is more than 1 omega, the equipment or the cable is not connected, and the checking and processing should be carried out as soon as possible.

Fig. 9 is the utility model discloses an use circuit diagram of comprehensive ground connection on-line measuring system intelligent object at railway traction substation.

The intelligent module adopts STM32 series, specifically adopts STM32F103VGT6 chip, and STM32F103VGT6 chip adopts ARMCortex-M3 kernel, has first-class peripheral simultaneously: a dual 12-bit ADC of 1 μ s, a UART of 4 megabits/second, and an SPI of 18 megabits/second.

Fig. 10 is a circuit diagram of a power module of an integrated grounding on-line detection system applied to a railway traction substation according to the present invention;

the power module is connected with the display module, the intelligent module and the communication module and supplies power.

The power supply module adopts TBB520, TB6806 or TB6818 chips. The power module adopts a TB6806 chip, the TB6806 chip does not have abnormal sound in work, and meanwhile, excellent dynamic performance can be guaranteed. By utilizing the integrated line loss compensation function, high-performance constant voltage output performance can be obtained; the integrated multiple protection function: VDD under voltage protection (UVLO), VDD Over Voltage Protection (OVP), cycle-by-cycle current limit protection (OCP), short circuit protection (SLP), VDD clamping, and the like.

Fig. 11 is a circuit diagram of a display module of an integrated grounding on-line detection system applied to a railway traction substation according to the present invention;

the LCD display module adopts chips such as CH463, HBS1621 or TM1722, and preferably adopts pins SDA and SCL 35 of a CH463 two-wire serial interface to be connected with pins I2C2 SDA and I2C 2SCL 47 of a chip 48 of an intelligent module STM32F103VGT6, so that pins are saved; a clock oscillation circuit is arranged in the device, so that a clock is not required to be provided externally or an oscillation component is not required to be connected externally, and the device is more anti-interference; and providing the LQFP44 leadless package which is compatible with RoHS.

Fig. 12 is a circuit diagram of a communication module of the integrated grounding on-line detection system applied to a railway traction substation according to the present invention;

the communication module adopts RS485, and concretely adopts an ADM2483BRWZ chip. The ADM2483BRWZ chip is connected with an upper computer system through a 13 pin B and a 12 pin A. ADM2483BRWZ is an isolated RS485 differential bus transceiver. It is an integrated electrical isolation assembly designed for bi-directional data communication over balanced multi-drop bus transmission lines. It is constrained from wobbling to reduce reflections from the transmission line. The controlled slew rate limits the data rate to 500 kbps. The input impedance of the device is 96k omega, and the bus can accommodate 256 transceivers at most. The driver has a high level enable function. The driver differential outputs and the receiver differential inputs are internally connected to form differential I/O ports. The receiver input has a true fail-safe function that ensures a logic high receiver output level when the input is open or short circuited. This ensures that the receiver output is in a known state before the start of the communication and at the end of the communication.

The communication module may also employ RS232(MAX232, MC1489, etc.), CAN (SP 491E, PCA82C250 chip, etc.), Power Carrier, Ethernet, bus, wifi (QCA4531 chip, etc.), Bluetooth (CC 264 chip, etc.), Zigbee (CC3530 chip), 2G, 3G, 4G chip, etc.

Fig. 13 is a circuit diagram of an analog signal processing unit of an integrated grounding on-line detection system applied to a railway traction substation according to embodiment 11 of the present invention.

Step voltage and contact voltage monitoring box includes voltage signal acquisition subunit, analog signal processing unit, subunit takes place for the electric current, voltage signal acquisition subunit is connected with analog signal processing unit, signal analog signal processing unit includes OP417 operational amplifier chip and LM324 operational amplifier chip, realize analog signal processing, 33 pin connections through UAP interface and STM32F103VGT6 chip, subunit takes place for the electric current is connected through the DOUT interface and 84 pin of STM32F103VGT6 chip.

The ground net backward flow monitoring case includes current signal acquisition unit, the analog signal processing unit of connection, and the analog signal processing unit includes OP417 operational amplifier chip and LM324 operational amplifier chip, realizes analog signal processing, is connected with the 24 pins of STM32F103VGT6 chip through the AIN1 interface.

The analog signal processing unit connected with the soil resistivity monitoring box, the electrical integrity monitoring box and the grounding resistance monitoring box is similar to the voltage and current signal analog signal processing unit, so that analog signal processing is realized.

The analog signal processing unit connected with the soil resistivity monitoring box is connected with a 34 pin of an STM32F103VGT6 chip through an UBP interface, is connected with a 25 pin of an STM32F103VGT6 chip through an AIN2 interface,

the analog signal processing unit connected with the electrical integrity monitoring box is connected with 35 pins of an STM32F103VGT6 chip through a UCP interface, is connected with 26 pins of an STM32F103VGT6 chip through an AIN3 interface,

and an analog signal processing unit connected with the grounding resistance monitoring box is connected with a 23 pin of an STM32F103VGT6 chip through an AIN0 interface.

FIG. 15 is a block diagram of the comprehensive grounding on-line detection system of the present invention;

a comprehensive grounding on-line detection system applied to a railway traction substation comprises a traction substation comprehensive grounding on-line monitoring screen cabinet and a soil resistivity monitoring box, a step voltage monitoring box, a contact voltage monitoring box, an electrical integrity monitoring box, a grounding resistance monitoring box and a ground network backflow monitoring box which are respectively connected with the traction substation comprehensive grounding on-line monitoring screen cabinet, wherein the traction substation comprehensive grounding on-line monitoring screen cabinet comprises a display module, an intelligent module and a communication module;

the method comprises the following steps of collecting a plurality of grounding parameters such as soil resistivity, step voltage, contact voltage, electrical integrity, grounding resistance, grounding grid backflow and the like through a soil resistivity monitoring box, a step voltage monitoring box, a contact voltage monitoring box, an electrical integrity monitoring box, a grounding resistance monitoring box and a grounding grid backflow monitoring box, comprehensively reflecting the condition of a grounding system, and when the parameters are abnormal, drawing a comprehensive grounding on-line monitoring screen cabinet of a substation and a monitoring center upper computer to give an alarm so as to process in time and ensure the safety and reliability of a railway comprehensive grounding system; and monitoring the ambient temperature and humidity values of the traction substation through a temperature sensor and a humidity sensor. The intelligent module is used for setting alarm upper limit and lower limit values of the temperature and the humidity of each temperature and humidity sensor, when data detected by any temperature and humidity sensor exceed the set upper limit or lower limit, the traction substation comprehensively grounds the online monitoring screen cabinet and the monitoring center upper computer to send out an alarm, and the equipment is ensured to be in a proper temperature and humidity environment; through pyroelectric infrared sensor and entrance guard control module device, judge whether someone gets into the warning district through pyroelectric infrared sensor, entrance guard control module device realizes the entrance guard management who draws the electric substation, ensures that the equipment of drawing the electric substation obtains the guarantee, provides effective way for drawing the electric substation safety protection control.

The system can be connected with a secondary centralized intelligent lightning protection cabinet product to form a railway comprehensive intelligent lightning protection grounding monitoring system; the product can also be connected to a traction substation auxiliary monitoring system to become one of the subsystems.

It is worth pointing out that the protection scope of the present invention is not limited to the above specific example, and according to the basic technical concept of the present invention, the same basic structure can be used, so as to achieve the purpose of the present invention, as long as the ordinary skilled person in the art does not need to work creatively, the conceivable embodiments all belong to the protection scope of the present invention.

Claims

1. The comprehensive grounding on-line detection system applied to the railway traction substation is characterized by comprising a traction substation comprehensive grounding on-line monitoring screen cabinet, and a soil resistivity monitoring box, a step voltage monitoring box, a contact voltage monitoring box, an electrical integrity monitoring box, a grounding resistance monitoring box and a ground network backflow monitoring box which are respectively connected with the traction substation comprehensive grounding on-line monitoring screen cabinet.

2. The comprehensive grounding on-line detection system applied to the railway traction substation of claim 1, wherein the comprehensive grounding on-line monitoring screen cabinet of the traction substation comprises a display module, an intelligent module and a communication module; the display module and the communication module are both connected with the intelligent module; the soil resistivity monitoring box, the stepping voltage monitoring box, the contact voltage monitoring box, the electrical integrity monitoring box, the grounding resistance monitoring box and the ground network backflow monitoring box are respectively connected with the intelligent module.

3. The system for on-line detection of comprehensive grounding applied to the railway traction substation as claimed in claim 2, further comprising a temperature sensor and a humidity sensor connected with the intelligent module.

4. The comprehensive grounding on-line detection system applied to the railway traction substation according to claim 3, characterized by further comprising an access control device and a pyroelectric infrared sensor which are connected with the intelligent module.

5. The comprehensive grounding on-line detection system applied to the railway traction substation of claim 1, wherein the grounding grid backflow monitoring box comprises a backflow detection terminal and a sensor which are arranged at a test point outside a comprehensive grounding on-line monitoring screen cabinet of the traction substation; and the backflow detection terminal and the sensor are connected to a comprehensive grounded online monitoring screen cabinet of the traction substation through an AC220V power line and a 485 bus.

6. The comprehensive grounding on-line detection system applied to the railway traction substation according to claim 1, wherein the grounding resistance monitoring box is connected with an auxiliary grounding electrode through a detection wiring; the auxiliary grounding electrode comprises a voltage electrode and a current electrode, the grounding resistance monitoring box is provided with 3 test points, the 3 test points respectively select equipotential busbars of a control room and a transformer room and outdoor points to be monitored, the 3 test points share the voltage electrode and the current electrode, and switching operation is carried out through a switch;

the soil resistivity monitoring box is provided with 4 test points through a detection wiring, the 4 test points are distributed on a straight line, and the distances between the adjacent test points are the same; two test points at two sides are provided with current poles, and two test points in the middle are provided with voltage poles; the distance between adjacent test points is more than or equal to 100 meters, and the distance between each test point electrode and the railway roadbed is not less than 100 meters.

7. The on-line comprehensive grounding detection system applied to the railway traction substation is characterized in that the step voltage monitoring box and the contact voltage monitoring box are connected with a first current pole, a second current pole, a first voltage pole, a second voltage pole, a third voltage pole and a fourth voltage pole through detection wiring; the first voltage pole and the second voltage pole are used for contact voltage testing, the third voltage pole and the fourth voltage pole are used for step voltage testing, and the first current pole and the second current pole are a pair of current poles shared in step voltage and contact voltage testing.

8. The on-line comprehensive grounding detection system applied to the railway traction substation is characterized in that the electrical integrity monitoring box is connected with a first test pole, a second test pole, a third test pole, a fourth test pole and a fifth test pole through detection wiring;

the first test electrode is connected to a grounding terminal connected with the comprehensive grounding system and used as a reference point; the second test pole, the third test pole, the fourth test pole and the fifth test pole are connected to a point connected with the comprehensive grounding system, and the distance between the second test pole and the first test pole is less than or equal to 300 meters.

9. The comprehensive grounding on-line detection system applied to the railway traction substation is characterized by further comprising a monitoring center upper computer, wherein the comprehensive grounding on-line monitoring screen cabinet of the traction substation is in communication connection with the monitoring center upper computer through the communication module;

the communication module is at least one of an RS485 interface, an RS232 interface, a USB interface, a network port and a ZigBee wireless module.

10. The system for comprehensively detecting the grounding of the railway traction substation in the on-line manner as claimed in claim 4, wherein the intelligent module adopts an STM32F103VGT6 chip, the communication module adopts an ADM2483BRWZ chip in RS485, and the STM32F103VGT6 chip is connected with the ADM2483BRWZ chip through a USART interface;

the temperature sensor and the humidity sensor adopt a temperature and humidity composite sensor DHT11, and the temperature and humidity composite sensor DHT11 is connected with the STM32F103VGT6 chip;

the access control device comprises an STC89C52 single chip microcomputer, an FM-180 fingerprint identification module, an LCD1602 liquid crystal display, an electronic lock access control circuit, a clock circuit DS1302 and a key circuit;

the STC89C52 single chip microcomputer and the STM32F103VGT6 chip are connected through NRF24L01 to achieve radio frequency communication;

the pyroelectric infrared sensor adopts a PD632 chip, and the PD632 chip is connected with the STM32F103VGT6 chip.