Visual grounding device electricity testing unit for rail transit

Abstract

The utility model discloses an electricity testing unit of a rail transit visual grounding device. The electricity testing unit comprises a residual voltage discharge loop, a live detection loop and an MCU controller. The residual voltage discharge loop and the live detection loop are arranged in parallel; two ends of one side of the residual voltage release loop are respectively connected with the contact rail and the walking rail, and the other side of the residual voltage release loop is connected with the MCU controller; the two ends of one side of the live detection loop are connected with the contact rail and the walking rail respectively, and the other side of the live detection loop is connected with the MCU controller. According to the utility model, live detection loop access does not affect the insulation level of the overhead line system; and the fault state of the high-voltage direct-current voltage transmitter and the performance reduction state of the high-voltage direct-current voltage transmitter can be automatically identified.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of visual grounding device, concretely relates to a rail transit visual grounding device. BACKGROUND

[0002] Visual grounding device is often applied to DC1500V urban rail transit depot, parking lot and main line station, replaces manual work, realizes automatic electricity testing, automatic ground wire hanging, ground wire dismounting and other functions when the line is powered off for maintenance.

[0003] The existing visual grounding device electricity testing circuit often adopts Figure 1 The circuit shown in the figure, two electricity testing circuits are redundantly arranged, each electricity testing circuit includes a high-voltage direct-current fuse and a high-voltage direct-current voltage transmitter, and a residual voltage discharge circuit is connected in parallel behind the high-voltage direct-current fuse of one of the electricity testing circuits, including a high-voltage relay and a high-voltage power resistor.

[0004] This electricity testing circuit mainly has the following problems or deficiencies:

[0005] 1) The catenary cable on the electricity testing circuit is always connected with the catenary, which inevitably reduces the insulation level of the catenary.

[0006] 2) The high-voltage direct-current voltage transmitter in the electricity testing circuit often adopts a DC05V or DC010V voltage signal output, which cannot identify the fault state of the transmitter.

[0007] 3) The high-voltage direct-current voltage transmitter in the electricity testing circuit may have performance degradation during long-term use, and the existing grounding device cannot automatically identify the performance change of the high-voltage direct-current voltage transmitter and give early warning. INVENTION CONTENTS

[0008] The utility model aims at the above-mentioned deficiencies in the prior art, and provides a rail transit visual grounding device electricity testing unit to solve the problems of reduced insulation level of the catenary, inability to automatically identify the fault state and performance degradation state of the high-voltage direct-current voltage transmitter.

[0009] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0010] A rail transit visual grounding device electricity testing unit, which includes a residual voltage discharge circuit, a live detection circuit and an MCU controller, wherein the residual voltage discharge circuit and the live detection circuit are connected in parallel, one side of the residual voltage discharge circuit is connected to the contact rail and the running rail at both ends, the other side of the residual voltage discharge circuit is connected to the MCU controller, one side of the live detection circuit is connected to the contact rail and the running rail at both ends, and the other side of the live detection circuit is connected to the MCU controller.

[0011] Further, the residual voltage discharge circuit comprises a high-voltage DC fuse FU1, a high-voltage relay K1, a high-voltage power resistor R1, a driving resistor R4, a driving opto-isolator U1 and a freewheeling diode D1.

[0012] The high-voltage DC fuse FU1, the switch of the high-voltage relay K1 and the high-voltage power resistor R1 are connected in series and arranged between the contact rail and the running rail.

[0013] The coil of the high-voltage relay K1 and the freewheeling diode D1 are connected in parallel and connected with the driving opto-isolator U1; the driving opto-isolator U1 is connected with the MCU controller through the driving resistor R4.

[0014] Further, the driving opto-isolator U1 is a TLP127 driving opto-isolator U1; the 4th pin of the TLP127 driving opto-isolator U1 is connected with the coil of the high-voltage relay K1; the 2nd pin of the TLP127 driving opto-isolator U1 is connected with the 49th pin of the MCU controller through the driving resistor R4.

[0015] Further, the electrification detection circuit comprises an electrification interface circuit one and an electrification interface circuit two.

[0016] Further, the electrification interface circuit one comprises a high-voltage DC fuse FU2, a high-voltage relay K2, a high-voltage DC voltage transmitter BT2, a sampling resistor R3, an ADC analog-digital converter U4, a driving resistor R5, a driving opto-isolator U2 and a freewheeling diode D2.

[0017] One end of the high-voltage DC fuse FU2 is connected with the contact rail, and the other end of the high-voltage DC fuse FU2 is connected with the switch of the high-voltage relay K2 and the high-voltage DC voltage transmitter BT2 in sequence.

[0018] The coil of the high-voltage relay K2 and the freewheeling diode D2 are connected in parallel and connected with the driving opto-isolator U2; the driving opto-isolator U2 is connected with the MCU controller through the driving resistor R5.

[0019] The high-voltage DC voltage transmitter BT2 is connected with the ADC analog-digital converter U4 through the sampling resistor R3; the ADC analog-digital converter U4 is connected with the MCU controller through an SPI interface.

[0020] Further, the driving opto-isolator U2 is a TLP127 driving opto-isolator U2; the 4th pin of the TLP127 driving opto-isolator U2 is connected with the coil of the high-voltage relay K2; the 2nd pin of the TLP127 driving opto-isolator U2 is connected with the 50th pin of the MCU controller through the driving resistor R5.

[0021] Further, the high-voltage DC voltage transmitter BT2 is a HY-SYB01A / 4 high-voltage DC voltage transmitter BT2; the ADC analog-to-digital converter U4 is an AD7606BST analog-to-digital converter U4;

[0022] The 5th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 is connected with the running rail, the 6th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 is connected with the switch of the high-voltage relay K2; the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 are respectively connected with the 51st pin and the 52nd pin of the AD7606BST analog-to-digital converter U4; and the sampling resistor R3 is arranged between the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2.

[0023] Further, the electricity testing interface circuit two comprises a high-voltage DC fuse FU3, a high-voltage relay K3, a high-voltage DC voltage transmitter BT1, a sampling resistor R2, an ADC analog-to-digital converter U4, a driving resistor R5, a driving opto-isolator U2 and a freewheeling diode D3.

[0024] One end of the high-voltage DC fuse FU3 is connected with the contact rail, and the other end of the high-voltage DC fuse FU3 is sequentially connected with the switch of the high-voltage relay K3 and the high-voltage DC voltage transmitter BT1.

[0025] The coil of the high-voltage relay K3 and the freewheeling diode D3 are connected in parallel and then connected with the driving opto-isolator U2; the driving opto-isolator U2 is connected with the MCU controller through the driving resistor R5.

[0026] The high-voltage DC voltage transmitter BT1 is connected with the ADC analog-to-digital converter U4 through the sampling resistor R2; the ADC analog-to-digital converter U4 is connected with the MCU controller through an SPI interface.

[0027] Further, the driving opto-isolator U3 is a TLP127 driving opto-isolator; the 4th pin of the TLP127 driving opto-isolator is connected with the coil of the high-voltage relay K3; the 2nd pin of the TLP127 driving opto-isolator is connected with the 50th pin of the MCU controller through the driving resistor R5.

[0028] Further, the high-voltage DC voltage transmitter BT1 is a HY-SYB01A / 4 high-voltage DC voltage transmitter BT1;

[0029] The 5th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1 is connected with the running rail and the 5th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 respectively;

[0030] The 6-pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1 is connected with the switch of the high-voltage relay K3; the 3-pin and the 4-pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1 are connected with the 49-pin and the 50-pin of the AD7606BST analog-digital converter U4 respectively; and the sampling resistor R2 is arranged between the 3-pin and the 4-pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1.

[0031] The rail transit visualized grounding device electricity testing unit has the following beneficial effects:

[0032] 1. The electrification detection loop is not connected to affect the insulating level of the contact network: by connecting the high-voltage relay in series in the electrification detection loop, the electrification detection loop is only put into operation when electrification is needed, and is withdrawn after electrification is completed, and the insulating level of the contact network is not affected during the non-electrification period.

[0033] 2. The electrification detection loop can automatically identify the fault state of the high-voltage DC voltage transmitter: the high-voltage DC voltage transmitter adopts 4-20mA signal output, and when the output current is less than 4mA, it is judged that the high-voltage DC voltage transmitter output is disconnected, and the grounding device closing operation is locked.

[0034] 3. The electrification detection loop can automatically identify the performance degradation state of the high-voltage DC voltage transmitter: during electrification, the voltage detection values of the two high-voltage DC voltage transmitters in the electrification interface loop one and the electrification interface loop two are compared in real time, and when the difference between the two is greater than the set value, the alarm is started. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a circuit diagram of the existing rail transit visualized grounding device electricity testing unit.

[0036] Figure 2 It is a circuit diagram of the rail transit visualized grounding device electricity testing unit of the present application. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application are described below in order to facilitate the understanding of the present application by those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, it is obvious that all changes within the spirit and scope of the present application defined and determined by the appended claims are obvious, and all applications using the concept of the present application are within the scope of protection.

[0038] Example 1

[0039] The embodiment provides a rail transit visual grounding device static electricity detection unit, which can effectively solve the problems of reduced insulation level of a contact network, inability to automatically identify a high-voltage direct-current voltage transmitter fault state and performance decline state, and the like Figure 2 , and specifically comprises the following:

[0040] a residual voltage discharge circuit, a live detection circuit and an MCU controller.

[0041] In the embodiment, the residual voltage discharge circuit and the live detection circuit are connected in parallel, two ends of one side of the residual voltage discharge circuit are connected with the contact rail and the running rail respectively, and the other side of the residual voltage discharge circuit is connected with the MCU controller; two ends of one side of the live detection circuit are connected with the contact rail and the running rail respectively, and the other side of the live detection circuit is connected with the MCU controller.

[0042] Specifically, as a preferred embodiment, the preferred settings of the residual voltage discharge circuit and the live detection circuit are given below.

[0043] The residual voltage discharge circuit comprises a high-voltage direct-current fuse FU1, a high-voltage relay K1, a high-voltage power resistor R1, a driving resistor R4, a driving opto-isolator U1 and a freewheeling diode D1.

[0044] The high-voltage direct-current fuse FU1, the switch of the high-voltage relay K1 and the high-voltage power resistor R1 are connected in series in sequence and are arranged between the contact rail and the running rail; the coil of the high-voltage relay K1 and the freewheeling diode D1 are connected in parallel and are connected with the driving opto-isolator U1; the driving opto-isolator U1 is connected with the MCU controller through the driving resistor R4.

[0045] Preferably, the driving opto-isolator U1 is a TLP127 driving opto-isolator U1.

[0046] In the specific connection, the coil of the high-voltage relay K1 and the freewheeling diode D1 are connected in parallel and are connected with the 4th pin of the TLP127 driving opto-isolator U1; the 2nd pin of the TLP127 driving opto-isolator U1 is connected with the 49th pin of the MCU controller through the driving resistor R4.

[0047] The live detection circuit comprises a static electricity detection interface circuit I and a static electricity detection interface circuit II.

[0048] The live detection circuit comprises a static electricity detection interface circuit I and a static electricity detection interface circuit II.

[0049] The live detection circuit comprises a static electricity detection interface circuit I and a static electricity detection interface circuit II.

[0050] The static electricity detection interface circuit I comprises a high-voltage direct-current fuse FU2, a high-voltage relay K2, a high-voltage direct-current voltage transmitter BT2, a sampling resistor R3, an ADC analog-digital converter U4, a driving resistor R5, a driving opto-isolator U2 and a freewheeling diode D2.

[0051] One end of the high-voltage DC fuse FU2 is connected with the contact rail, and the other end of the high-voltage DC fuse FU2 is connected with the switch of the high-voltage relay K2 and the high-voltage DC voltage transmitter BT2 in sequence;

[0052] The coil of the high-voltage relay K2 and the freewheeling diode D2 are connected in parallel and then connected with the driving opto-isolator U2; the driving opto-isolator U2 is connected with the MCU controller through the driving resistor R5;

[0053] The high-voltage DC voltage transmitter BT2 is connected with the ADC analog-to-digital converter U4 through the sampling resistor R3; the ADC analog-to-digital converter U4 is connected with the MCU controller through the SPI interface.

[0054] The driving opto-isolator U2 is preferably TLP127 driving opto-isolator U2 in the embodiment; the 4th pin of the TLP127 driving opto-isolator U2 is connected with the coil of the high-voltage relay K2, and the 2nd pin of the TLP127 driving opto-isolator U2 is connected with the 50th pin of the MCU controller through the driving resistor R5.

[0055] The high-voltage DC voltage transmitter BT2 is preferably HY-SYB01A / 4 high-voltage DC voltage transmitter BT2, and the ADC analog-to-digital converter U4 is AD7606BST analog-to-digital converter U4 in the embodiment;

[0056] The 5th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 is connected with the running rail, the 6th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 is connected with the switch of the high-voltage relay K2, the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 are respectively connected with the 51st pin and the 52nd pin of the AD7606BST analog-to-digital converter U4, and the sampling resistor R3 is arranged between the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2.

[0057] The second electricity testing interface circuit comprises a high-voltage DC fuse FU3, a high-voltage relay K3, a high-voltage DC voltage transmitter BT1, a sampling resistor R2, an ADC analog-to-digital converter U4, a driving resistor R5, a driving opto-isolator U2 and a freewheeling diode D3.

[0058] One end of the high-voltage DC fuse FU3 is connected with the contact rail, and the other end of the high-voltage DC fuse FU3 is connected with the switch of the high-voltage relay K3 and the high-voltage DC voltage transmitter BT1 in sequence;

[0059] The coil of the high-voltage relay K3 and the freewheeling diode D3 are connected in parallel and then connected with the driving opto-isolator U2; the driving opto-isolator U2 is connected with the MCU controller through the driving resistor R5;

[0060] The high-voltage direct-current voltage transmitter BT1 is connected with the ADC analog-digital converter U4 through a sampling resistor R2; the ADC analog-digital converter U4 is connected with the MCU controller through an SPI interface.

[0061] The driving optoelectronic isolator U3 is a TLP127 driving optoelectronic isolator; the 4th pin of the TLP127 driving optoelectronic isolator is connected with the coil of the high-voltage relay K3, and the 2nd pin of the TLP127 driving optoelectronic isolator is connected with the 50th pin of the MCU controller through a driving resistor R5.

[0062] The high-voltage direct-current voltage transmitter BT1 is a HY-SYB01A / 4 high-voltage direct-current voltage transmitter BT1.

[0063] The 5th pin of the HY-SYB01A / 4 high-voltage direct-current voltage transmitter BT1 is connected with the walking rail and the 5th pin of the HY-SYB01A / 4 high-voltage direct-current voltage transmitter BT2 respectively.

[0064] The 6th pin of the HY-SYB01A / 4 high-voltage direct-current voltage transmitter BT1 is connected with the switch of the high-voltage relay K3; the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage direct-current voltage transmitter BT1 are connected with the 49th pin and the 50th pin of the AD7606BST analog-digital converter U4 respectively; and the sampling resistor R2 is arranged between the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage direct-current voltage transmitter BT1.

[0065] The specific model or parameter of the related electronic components in the embodiment is as follows:

[0066] The high-voltage direct-current fuses FU1, FU2 and FU3 are DC1500V / 1A.

[0067] The high-voltage direct-current fuses K1, K2 and K3 are HVR24-1A10.

[0068] The high-voltage resistor R1 is RI80 10W / 5M.

[0069] The high-voltage direct-current transmitters BT1 and BT2 are HY-SYB01A / 4.

[0070] The sampling resistors R3 and R4 are 200Ω.

[0071] The ADC analog-digital converter U4 is AD7606BST.

[0072] The MCU controller U3 is GD32F450ZKT6.

[0073] R4 and R5 are 1KΩ.

[0074] The driving optoelectronic isolators U1 and U2 are TLP127.

[0075] Free-wheeling diodes D1, D2, D2: 1N4007

[0076] The working principle of the rail transit visual grounding device electricity testing unit of the embodiment is as follows:

[0077] When the subway line needs to be overhauled, the operation personnel of the operation unit operate the "apply electricity testing" button of the visual grounding device. After the visual grounding device controller detects the request signal, the MCU controller U3 outputs a low-level signal through the 50th pin, drives the opto-isolator U2, thereby driving the on-off switch of the high-voltage relay K2 and the high-voltage relay K3 to be closed, and further connecting the redundantly set electricity testing interface loop one and the electricity testing interface loop two.

[0078] After the redundantly set electricity testing interface loop one and the electricity testing interface loop two are connected,

[0079] The catenary voltage signal is divided into two paths. One path of the catenary voltage signal passes through the high-voltage fuse FU3 and the high-voltage relay K3 switch and is input to the primary side of the high-voltage DC transmitter BT1. The secondary side of the high-voltage DC transmitter BT1 is isolated output 4-20mA, which is converted into a 0.8-4V voltage signal on the sampling resistor R2 and is input to the ADC analog-to-digital converter U4.

[0080] The other path of the catenary voltage signal passes through the high-voltage fuse FU2 and the high-voltage relay K2 switch and is input to the primary side of the high-voltage DC transmitter BT2. The secondary side of the high-voltage DC transmitter BT2 is isolated output 4-20mA, which is converted into a 0.8-4V voltage signal on the sampling resistor R3 and is input to the ADC analog-to-digital converter U4.

[0081] The ADC analog-to-digital converter U4 is connected with the MCU controller U5 through the SPI port. Under the control of the MCU, A / D sampling, conversion and calculation are performed to realize catenary voltage measurement.

[0082] The MCU controller controls the ADC analog-to-digital converter through the SPI interface. The measured catenary voltage is a direct current voltage, which has a pulsating component. The response time of the high-voltage DC voltage sensor is ≤10ms. A point is sampled every 5ms. The data buffer area uses a FIFO with a length of 5. Every time a new data is sampled, the data in the buffer area moves forward. The front data in the queue overflows, and the new data is placed at the tail. The data is calculated once every 5ms. The data in the buffer area is defined as D1-D5. The specific calculation is as follows:

[0083] The A / D sampling calculation value is as follows:

[0084]

[0085] The channel voltage measurement value U is as follows:

[0086]

[0087] Wherein, D1~D5 are A / D real-time sampling values; Data is A / D sampling smooth filter calculation value; Zero is A / D sampling channel zero point; Full is A / D sampling channel zero point; Range is A / D sampling channel range.

[0088] When the channel voltage measurement value U corresponding to the output signal of the high-voltage DC voltage transmitter is less than -125V (0V corresponds to the output 4mA of the secondary side of the high-voltage DC voltage transmitter, and corresponds to the input 0V of the primary side of the high-voltage DC voltage transmitter), it is judged that the output of the high-voltage DC voltage transmitter is disconnected or fails, and the closing operation of the grounding device is blocked.

[0089] When the channel voltage measurement value U corresponding to the output signal of the high-voltage DC voltage transmitter is greater than 900V, it is judged that the overhead contact system is not powered off, the closing operation of the grounding device is prohibited, the MCU controller outputs a high-level signal through the 50th pin, the driving signal of the opto-isolator U2 is disconnected, the high-voltage relays K3 and K4 are released, and the redundant test circuit loop one and the test circuit loop two are disconnected, thereby exiting the test operation.

[0090] When the channel voltage measurement value U corresponding to the output signal of the high-voltage DC voltage transmitter is greater than the test threshold voltage (generally 600V by default) and less than 900V, it is judged that the overhead contact system has been powered off, but there is residual voltage that needs to be discharged, the MCU controller outputs a low-level signal through the 49th pin to drive the opto-isolator U1, thereby driving the high-voltage relay K1 to close the switch and connect the residual voltage discharge circuit to the overhead contact system to discharge the residual voltage.

[0091] The MCU controller starts a delay, and during the delay time, the MCU controller continuously monitors the overhead contact system voltage, when the overhead contact system voltage is lower than the test threshold voltage, the MCU controller outputs a high-level signal through the 49th pin to remove the residual voltage discharge circuit, ends the test, and allows the closing operation of the grounding device; if the overhead contact system voltage is still higher than the test threshold voltage during the delay time, the test fails, the closing operation of the grounding device is prohibited, and the MCU controller outputs a high-level signal through the 49th pin to remove the residual voltage discharge circuit and end the test.

[0092] The application is connected in series with the normally open high-voltage relay behind the high-voltage DC fuse of each test circuit, when the test is needed, the visual grounding device controller outputs a control signal to control the high-voltage relay contact to close, so that the test circuit is connected with the overhead contact system to complete the test, after the test is completed, the visual grounding device controller removes the control signal output, thereby disconnecting the high-voltage relay contact to disconnect the test circuit (live detection circuit) from the overhead contact system.

[0093] The charged detection circuit adopts a high-voltage DC voltage transmitter outputting a DC 4-20 mA signal, and a 0V high-voltage signal input corresponds to a high-voltage DC voltage transmitter secondary side 4mA current output. Through threshold judgment, when the output current is less than 4mA, it is judged that the high-voltage DC voltage transmitter has internal failure, and an alarm is given, and the grounding device closing operation is locked out.

[0094] In the charged detection circuit, the high-voltage DC voltage transmitter may have performance degradation during long-term use, and the existing grounding device controller cannot automatically identify the performance change of the high-voltage DC voltage transmitter. In view of this situation, the voltage detection values of the electricity testing interface circuit 1 and the electricity testing interface circuit 2 are compared in real time, and a judgment threshold is set. When the difference between the voltage detection values of the two circuits is greater than the set threshold value, an early warning is given to prompt the user to check and repair in time.

[0095] Although the specific embodiments of the utility model are described in detail in combination with the drawings, it should not be understood as limiting the protection scope of the patent. Various modifications and changes made by those skilled in the art within the scope described in the claims are still within the protection scope of the patent.

Claims

1. A rail transit visual grounding device static electricity detection unit, characterized in that: The residual voltage relief circuit, the electrification detection circuit and the MCU controller are included; the residual voltage relief circuit is arranged in parallel with the electrification detection circuit; two ends of one side of the residual voltage relief circuit are connected with the contact rail and the running rail respectively, and the other side of the residual voltage relief circuit is connected with the MCU controller; two ends of one side of the electrification detection circuit are connected with the contact rail and the running rail respectively, and the other side of the electrification detection circuit is connected with the MCU controller.

2. The rail transit visual grounding device static electricity detection unit according to claim 1, characterized in that: The residual voltage relief circuit includes a high-voltage direct-current fuse FU1, a high-voltage relay K1, a high-voltage power resistor R1, a driving resistor R4, a driving opto-isolator U1 and a freewheeling diode D1. The high-voltage direct-current fuse FU1, the switch of the high-voltage relay K1 and the high-voltage power resistor R1 are sequentially connected in series and arranged between the contact rail and the running rail. The coil of the high-voltage relay K1 and the freewheeling diode D1 are connected in parallel and connected with the driving opto-isolator U1; the driving opto-isolator U1 is connected with the MCU controller through the driving resistor R4.

3. The rail transit visual grounding device static electricity detection unit according to claim 2, characterized in that: The driving opto-isolator U1 is a TLP127 driving opto-isolator U1; the 4th pin of the TLP127 driving opto-isolator U1 is connected with the coil of the high-voltage relay K1; the 2nd pin of the TLP127 driving opto-isolator U1 is connected with the 49th pin of the MCU controller through the driving resistor R4.

4. The rail transit visualization grounding device electrostatic detection unit of claim 1, wherein: The electrification detection circuit includes an electrification interface circuit one and an electrification interface circuit two.

5. The rail transit visual grounding device static electricity detection unit according to claim 4, characterized in that: The electrification interface circuit one includes a high-voltage direct-current fuse FU2, a high-voltage relay K2, a high-voltage direct-current voltage transmitter BT2, a sampling resistor R3, an ADC analog-digital converter U4, a driving resistor R5, a driving opto-isolator U2 and a freewheeling diode D2. One end of the high-voltage direct-current fuse FU2 is connected with the contact rail, and the other end of the high-voltage direct-current fuse FU2 is sequentially connected with the switch of the high-voltage relay K2 and the high-voltage direct-current voltage transmitter BT2. The coil of the high-voltage relay K2 and the freewheeling diode D2 are connected in parallel and connected with the driving opto-isolator U2; the driving opto-isolator U2 is connected with the MCU controller through the driving resistor R5. The high-voltage direct-current voltage transmitter BT2 is connected with the ADC analog-digital converter U4 through the sampling resistor R3; the ADC analog-digital converter U4 is connected with the MCU controller through an SPI interface.

6. The rail transit visual grounding device static electricity detection unit according to claim 5, characterized in that: The driving opto-isolator U2 is a TLP127 driving opto-isolator U2; the 4th pin of the TLP127 driving opto-isolator U2 is connected with the coil of the high-voltage relay K2; the 2nd pin of the TLP127 driving opto-isolator U2 is connected with the 50th pin of the MCU controller through the driving resistor R5.

7. The rail transit visualization grounding device electrostatic detection unit of claim 5, wherein: The high-voltage direct-current voltage transmitter BT2 is a HY-SYB01A / 4 high-voltage direct-current voltage transmitter BT2; the ADC analog-digital converter U4 is an AD7606BST analog-digital converter U4. The 5th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 is connected with the running rail, the 6th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 is connected with the switch of the high-voltage relay K2; the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 are respectively connected with the 51st pin and the 52nd pin of the AD7606BST analog-to-digital converter U4; and the sampling resistor R3 is arranged between the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2.

8. The rail transit visual grounding device static electricity detection unit according to claim 7, characterized in that: The electrostatic test interface circuit two comprises a high-voltage DC fuse FU3, a high-voltage relay K3, a high-voltage DC voltage transmitter BT1, a sampling resistor R2, an ADC analog-to-digital converter U4, a driving resistor R5, a driving opto-isolator U2 and a freewheeling diode D3; One end of the high-voltage DC fuse FU3 is connected with the contact rail, and the other end of the high-voltage DC fuse FU3 is sequentially connected with the switch of the high-voltage relay K3 and the high-voltage DC voltage transmitter BT1; The coil of the high-voltage relay K3 and the freewheeling diode D3 are connected in parallel and then connected with the driving opto-isolator U2; the driving opto-isolator U2 is connected with the MCU controller through the driving resistor R5; The high-voltage DC voltage transmitter BT1 is connected with the ADC analog-to-digital converter U4 through the sampling resistor R2; and the ADC analog-to-digital converter U4 is connected with the MCU controller through an SPI interface.

9. The rail transit visual grounding device static electricity detection unit according to claim 8, characterized in that: The driving opto-isolator U3 is a TLP127 driving opto-isolator; the 4th pin of the TLP127 driving opto-isolator is connected with the coil of the high-voltage relay K3; and the 2nd pin of the TLP127 driving opto-isolator is connected with the 50th pin of the MCU controller through the driving resistor R5.

10. The rail transit visualization grounding device electrostatic detection unit of claim 8, wherein: The high-voltage DC voltage transmitter BT1 is a HY-SYB01A / 4 high-voltage DC voltage transmitter BT1; The 5th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1 is connected with the running rail and the 5th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT2 respectively; The 6th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1 is connected with the switch of the high-voltage relay K3; the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1 are respectively connected with the 49th pin and the 50th pin of the AD7606BST analog-to-digital converter U4; and the sampling resistor R2 is arranged between the 3rd pin and the 4th pin of the HY-SYB01A / 4 high-voltage DC voltage transmitter BT1.

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