Intelligent online monitoring and diagnosing device for N600 multipoint grounding of transformer substation

Abstract

The invention relates to a transformer station N600 multipoint grounding intelligent on-line monitoring and diagnosis device, which comprises a body, open-close type current transformers and a box body, the body comprises a lower bottom and an upper cover, a buckle is arranged above the lower bottom, a four-loop current acquisition end is arranged in front of the upper cover, the four-loop current acquisition end is connected with the corresponding open-close type current transformer through a connecting line, and the open-close type current transformer is connected with the box body. A TF card is arranged below the four-loop current acquisition end, an alarm indicating lamp is arranged on the left side of the four-loop current acquisition end, a work indicating lamp is arranged on the left side of the alarm indicating lamp, terminal strips are arranged on the upper side and the lower side of the body, a 485 communication interface is arranged on the terminal strip below the body, and an alternating voltage input end is arranged on the terminal strip above the body. The AC voltage input end is respectively connected with A, B, C and N phases through connecting wires; the system has the advantages of reasonable structure, real-time online monitoring, fault diagnosis and alarm, preliminary positioning of multi-point grounding points, and guarantee of power supply reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of secondary operation and inspection of substations, and in particular relates to an intelligent online monitoring and diagnosis device for N600 multi-point grounding of substations. Background Art

[0002] Voltage transformer is an important primary equipment in substation. Its secondary circuit is usually connected to TV parallel device and then led to voltage busbar to provide secondary AC voltage for protection, measurement and metering devices. In order to protect personal and equipment safety, TV secondary circuit N600 must be grounded. When there is multi-point grounding in N600 circuit, once the system fails, a large current may flow in the substation grounding network, resulting in neutral point potential deviation and voltage-related protection malfunction. At present, there is no N600 multi-point grounding alarm mechanism in substation. Most of them are after the protection is not properly operated, and the recording analysis shows that there is N600 multi-point grounding in the substation, and then the investigation is carried out, which is a post-event remedial measure. At the same time, due to the large number of complex wiring, the investigation process requires experienced relay protection personnel, and it takes a lot of time and is inefficient. Therefore, it is very necessary to provide a substation N600 multi-point grounding intelligent online monitoring and diagnosis device with reasonable structure, real-time online monitoring to realize fault diagnosis and alarm, preliminarily locate multi-point grounding points, and ensure power supply reliability. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a substation N600 multi-point grounding intelligent online monitoring and diagnosis device with a reasonable structure, real-time online monitoring to realize fault diagnosis and alarm, preliminarily locate multi-point grounding points, and ensure power supply reliability.

[0004] The object of the present invention is achieved as follows: a substation N600 multi-point grounding intelligent online monitoring and diagnostic device, which includes a body, an open-close current transformer and a box body, the body includes a lower bottom and an upper cover, a buckle is arranged above the lower bottom, a 4-loop current acquisition terminal is arranged in front of the upper cover, the 4-loop current acquisition terminal is connected to the corresponding open-close current transformer through a connecting line, a TF card is arranged below the 4-loop current acquisition terminal, an alarm indicator light is arranged on the left side of the 4-loop current acquisition terminal, a working indicator light is arranged on the left side of the alarm indicator light, terminal blocks are arranged on the upper and lower sides of the body, a 485 communication interface is arranged on the terminal block below the body, an AC voltage input terminal is arranged on the terminal block above the body, and the AC voltage input terminal is connected to A, B, C, and N respectively through connecting lines.

[0005] The body also includes an acquisition module, an amplification module, a data conversion module, a power processing module and a microcomputer processing module. The acquisition module is connected to the open-close current transformer, the acquisition module, the amplification module and the data conversion module are respectively connected to the power processing module, the acquisition module is connected to the amplification module, the amplification module is connected to the data conversion module, and the data conversion module is connected to the microcomputer processing module.

[0006] The first output end of the microcomputer processing module is connected to the alarm output unit module, the second output end of the microcomputer processing module is respectively connected to the alarm indicator light and the display module, and the third output end of the microcomputer processing module is connected to the storage unit module.

[0007] The first input end of the microcomputer processing module is connected to the automatic reset module, the second input end of the microcomputer processing module is connected to the timing module, and the third input end of the microcomputer processing module is connected to the fixed value setting module.

[0008] The amplification module adopts the LM332 operational amplifier.

[0009] The box body comprises a base, a box shell is arranged above the base, a carrying strap is arranged in front of the box shell, angle irons are arranged on both sides above the box shell, an opening is arranged on the top of the box shell, and ventilation holes are arranged on both sides of the opening.

[0010] A display is arranged in front of the base, and a fan is arranged below the display; an opening and closing cover is arranged on the outside of the box shell, a handle is arranged above the opening and closing cover, and the opening and closing cover is movably connected to the box shell through a hinge.

[0011] A flat plate is arranged inside the box shell, a placing table is arranged above the flat plate, stabilizing plates are arranged on both sides below the placing table, rod sleeves are arranged at the outer ends of the stabilizing plates, guide light rods are arranged inside the rod sleeves, a wire sleeve is arranged at the inner end of the stabilizing plate, a wire rod is arranged inside the wire sleeve, and a public measurement and control device is arranged at the lower part of the box shell.

[0012] The public measurement and control device includes a remote dispatching main station monitoring module and a monitoring background signal alarm module. The remote dispatching main station monitoring module is connected to the monitoring background signal alarm module through a cable. A rotating plate is provided at the bottom of the monitoring background signal alarm module. One end of the rotating plate is movably connected to the top of the remote dispatching main station monitoring module. A connecting joint is provided above the monitoring background signal alarm module, and a signal light is provided below the connecting joint.

[0013] Beneficial effects of the invention: The present invention is an intelligent online monitoring and diagnosis device for multi-point grounding of N600 substation. During use, the present invention can be installed at the single-point grounding point of the voltage parallel panel of the substation to realize real-time and safe online monitoring of multi-point grounding current of the N600 circuit, intelligent diagnosis of multi-point grounding faults of the N600 circuit and alarm, and preliminary positioning of multi-point grounding points, and upload monitoring data and alarm information to the monitoring background and protection information substation, which is convenient for operation and maintenance personnel to handle in time and quickly, and has important practical significance for maintaining the safe operation of the power grid and ensuring the reliability of power supply. The present invention has the advantages of reasonable structure, real-time online monitoring to realize fault diagnosis and alarm, preliminary positioning of multi-point grounding points, and ensuring the reliability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a schematic diagram of the use status of a substation N600 multi-point grounding intelligent online monitoring and diagnosis device.

[0015] Figure 2 This is a main structural block diagram of a substation N600 multi-point grounding intelligent online monitoring and diagnosis device of the present invention.

[0016] Figure 3 The present invention is a flowchart of the intelligent online monitoring and diagnosis device for N600 multi-point grounding of a substation.

[0017] Figure 4 The present invention is a schematic diagram of an open-close current transformer of a substation N600 multi-point grounding intelligent online monitoring and diagnosis device.

[0018] Figure 5 The present invention is a schematic diagram of the control circuit of an alarm output unit module of a substation N600 multi-point grounding intelligent online monitoring and diagnosis device.

[0019] Figure 6 This is a three-dimensional diagram of the box of a substation N600 multi-point grounding intelligent online monitoring and diagnosis device of the present invention.

[0020] Figure 7 For the present invention Figure 6 Side view of.

[0021] Figure 8 For the present invention Figure 6 Rear view of.

[0022] Fig. 9 This is a schematic diagram of the structure of a common measurement and control device of a substation N600 multi-point grounding intelligent online monitoring and diagnosis device of the present invention.

[0023] In the figure: 1, body 11, buckle 12, lower bottom 13, upper cover 14, 4-loop current collection terminal 15, TF card 16, alarm indicator light 17, working indicator light 18, 485 communication interface 19, AC voltage input terminal 2, open and close current transformer 20, connecting line 3, box body 31, base 32, box shell 33, portable bag 34, angle iron 35, opening 36, ventilation hole 37, opening and closing cover 38, handle 39, hinge 310, display 311, fan 312, flat plate 313, placement table 314, stabilizing plate 315, rod sleeve 316, guide light rod 317, wire sleeve 318, screw rod 319, public measurement and control device 91, remote dispatching main station monitoring module 92, monitoring background signal alarm module 93, cable 94, rotating plate 95, connecting joint 96, signal light. Implementation

[0024] The present invention will be further described below in conjunction with the accompanying drawings. Example

[0025] like Figure 1-9 As shown, a substation N600 multi-point grounding intelligent online monitoring and diagnosis device includes a body 1, an open-close current transformer 2 and a box 3. The body 1 includes a lower bottom 12 and an upper cover 13. A buckle 11 is arranged above the lower bottom 12. A 4-loop current acquisition terminal 14 is arranged in front of the upper cover 13. The 4-loop current acquisition terminal 14 is connected to the corresponding open-close current transformer 2 through a connecting line 20. A TF card 15 is arranged below the 4-loop current acquisition terminal 14. An alarm indicator light 16 is arranged on the left side of the 4-loop current acquisition terminal 14. A working indicator light 17 is arranged on the left side of the alarm indicator light 16. Terminal blocks are arranged on the upper and lower sides of the body 1. A 485 communication interface 18 is arranged on the terminal block below the body 1. An AC voltage input terminal 19 is arranged on the terminal block above the body 1. The AC voltage input terminal 19 is connected to A, B, C, and N respectively through a connecting line 20.

[0026] In this embodiment, when the device needs to be moved, the portable carrying and mobile monitoring functions of the main body can be realized through the box and the portable carrying of the present invention; the box can also provide effective protection for the main body being measured, so that the device of the present invention can be flexibly applied to various branch sites, with a compact structure, convenient carrying and installation, three-way voltage direct access, and four-way current using 200A open-close current transformer input, which can simultaneously measure the amplitude of 1 to 3 AC voltages and 1 to 4 AC currents on the secondary side and the phase between each quantity, and is used for AC voltage, current amplitude and phase, power, power factor, waveform, harmonics (2nd to 50th) and other electrical parameters measurement, and can also be used for electric energy meter reading, the device structure is as follows Figure 1As shown, interface and function description: ① Voltage input interface: directly connected to the AC three-phase power supply to ensure long-term power supply of the device, and can also measure the amplitude and phase of the three-phase AC voltage; ②4-way current measurement loop: used for the access of 200A split current transformers. The transformers are plug-in, which is convenient for outdoor wiring of the instrument. It has 4 current channels and can monitor whether there is leakage current in the line. It uses an external high-precision split current transformer to directly access the grounding current line of each loop without affecting the safe operation of the system, and obtains the current of multiple loops in real time. The other end is input into the device, and the current value is processed internally by the device to obtain the collected current value in real time, monitor the current size of the grounding line, and realize current detection with milliampere-level accuracy. The detection range is 0-0.2A. By comparing the current size of each interval N600 loop and analyzing the abnormal current point, the interval where the multi-point grounding point is located can be effectively found out, and the multi-point grounding point can be located. ③485 interface: With 485 meter reading function, it can realize the data reading of single-phase and three-phase electric energy meters; ④ In actual use, the device of the present invention may also be provided with a pulse input and output interface: the pulse input and output interface is used for pulse input and output of electric energy verification; ⑤ In actual use, the device of the present invention can also be equipped with a Type-c interface: it can be used to power the instrument, using a power adapter and a Type-c data cable; ⑥Working indicator light: The red light stays on for 10s to 20s after power-on, and the green light flashes during normal measurement and data upload communication; ⑦Alarm indication and fault location: N600 multi-point grounding alarm and preliminary diagnosis and location of multi-point grounding points: check the interval where the multi-point grounding points are located, connect the normally open point of the relay action to the signal contact of the public measurement and control device, collect current through the device, and compare it with the set threshold value (the set alarm threshold current is 50mA). For multi-point grounding events, switch quantity action is performed. If the set alarm threshold is exceeded, relevant alarm information is immediately triggered for preliminary diagnosis and location; and the monitoring current results and fault alarms are uploaded to the background in real time, and the background light is lit, and the alarm window pops up the alarm information. The synchronization device has an alarm indicator light. When the relay is activated, the synchronization alarm indicator light flashes to remind; realize the preliminary diagnosis and location of the multi-point grounding points of the N600 loop; ⑧TF card: The device's measurement data is directly stored in the TF card that comes with the device as a data record backup. It cannot be plugged in or out while the device is powered on, and should be operated after the device is powered off.

[0027] The present invention is an intelligent online monitoring and diagnosis device for N600 multi-point grounding of a substation. During use, the present invention can be installed at a single-point grounding point of a voltage parallel panel of a substation to realize real-time and safe online monitoring of multi-point grounding current of an N600 circuit, intelligent diagnosis of multi-point grounding faults of an N600 circuit and alarm, preliminary positioning of multi-point grounding points, and uploading of monitoring data and alarm information to a monitoring background and a protection information substation, which is convenient for operation and maintenance personnel to handle in a timely and rapid manner, and has important practical significance for maintaining safe operation of a power grid and ensuring power supply reliability. The present invention has the advantages of reasonable structure, real-time online monitoring to realize fault diagnosis and alarm, preliminary positioning of multi-point grounding points, and ensuring power supply reliability. Example

[0028] like Figure 1-9 As shown, a substation N600 multi-point grounding intelligent online monitoring and diagnosis device includes a body 1, an open-close current transformer 2 and a box 3. The body 1 includes a lower bottom 12 and an upper cover 13. A buckle 11 is arranged above the lower bottom 12. A 4-loop current acquisition terminal 14 is arranged in front of the upper cover 13. The 4-loop current acquisition terminal 14 is connected to the corresponding open-close current transformer 2 through a connecting line 20. A TF card 15 is arranged below the 4-loop current acquisition terminal 14. An alarm indicator light 16 is arranged on the left side of the 4-loop current acquisition terminal 14. A working indicator light 17 is arranged on the left side of the alarm indicator light 16. Terminal blocks are arranged on the upper and lower sides of the body 1. A 485 communication interface 18 is arranged on the terminal block below the body 1. An AC voltage input terminal 19 is arranged on the terminal block above the body 1. The AC voltage input terminal 19 is connected to A, B, C, and N respectively through a connecting line 20.

[0029] The main body 1 also includes an acquisition module, an amplification module, a data conversion module, a power processing module and a microcomputer processing module. The acquisition module is connected to the open-close current transformer 2, and the acquisition module, the amplification module and the data conversion module are respectively connected to the power processing module, the acquisition module is connected to the amplification module, the amplification module is connected to the data conversion module, and the data conversion module is connected to the microcomputer processing module.

[0030] The first output end of the microcomputer processing module is connected to the alarm output unit module, the second output end of the microcomputer processing module is respectively connected to the alarm indicator light 16 and the display module, the third output end of the microcomputer processing module is connected to the storage unit module, and the alarm output unit module is connected to the public measurement and control device 319.

[0031] The first input end of the microcomputer processing module is connected to the automatic reset module, the second input end of the microcomputer processing module is connected to the timing module, and the third input end of the microcomputer processing module is connected to the fixed value setting module.

[0032] The amplification module adopts the LM332 operational amplifier.

[0033] In this embodiment, ① the open-type current transformer can also be replaced by a high-precision clamp-on current transformer in actual use. The high-precision clamp-on current transformer uses an open CT clamp to collect the current of the secondary neutral point N600 grounding wire of the substation voltage transformer, which will not affect or change the original N600 grounding wire condition of the substation. Figure 4 As shown, the current flowing through the only N600 grounding wire in the entire station is collected in real time on the PT parallel screen of the substation, and the output current data of the high-precision clamp-on current transformer is input into the collection module; ②Acquisition module, amplification circuit, A / D data conversion module: The acquisition module processes the input analog current value, removes the interference, and inputs it into the amplification module after processing. A two-stage amplification circuit is used. The first operational amplifier and the second operational amplifier both use LM332 operational amplifier chips. The output end of the two-stage operational amplifier circuit is input into the A / D data conversion module. The A / D data conversion module converts the acquisition module and the amplified voltage transformer secondary neutral line N600 grounding line current into digital signals and inputs them into the microcomputer processor; ③ Microcomputer processing module: The A / D data conversion module converts the analog current data of the neutral line N600 into digital data and inputs it into the microcomputer processing module. The microcomputer processing module has the functions of logic analysis and judgment. When the input current exceeds the set value, the relay coil is triggered to act. When the relay coil acts, the alarm module is triggered, the alarm indicator light is lit, and the display module is connected to the microprocessing module. When the value exceeds the set value of the microcomputer processing module, the alarm indication related circuit is triggered, the alarm light is lit, and the device can determine that N600 has a multi-point grounding fault; ④ Automatic reset module: automatic reset function, that is, the automatic reset module is connected to the microprocessor module, and the microprocessor monitors, analyzes and determines that the current of the neutral line N600 grounding line is normal, and automatically resets; the reset module is composed of a reset relay, an alarm reset unit, a power supply and related protection resistors, and can achieve automatic reset, such as Figure 6 As shown, the alarm reset unit of the reset-related circuit has the function of resetting the relay coil action, that is, the coil returns. When the reset circuit is closed, the alarm indicator light of the action relay goes out, and the normally open contact of the alarm signal is restored from the action closed state to the open state; Figure 6 In, R 1 , R 2 , R 3 K is the related protection element of the control circuit (resistance, inductance, capacitance), 1 , K 2is a relay, L is an alarm indicator light, and S is a reset button in the reset module; when the collected current exceeds the set value (50mA) of the microcomputer processing module, the relay K is triggered after a certain delay. 1 , relay K 1 Action, relay K 1 The normally open contact closes and triggers the signal contact of the public measurement and control device. The light-emitting sign on the monitoring background is lit, and the alarm window pops up the relevant alarm "Multiple-point grounding of the secondary neutral line N600 of the substation PT"; at the same time, the relay K 1 The other pair of normally open contacts of the trigger device is closed, the alarm module of the trigger device is activated, and the signal light is on. The reset button S is activated, triggering the relay K 2 , device reset signal alarm and relay K 1 , the device returns to normal working state; ⑤ Timing module: The timing module is suitable for accessing the GPS clock in the substation and has GPS timing function; ⑥ Fixed value setting module: The fixed value setting module is applied to the adjustable relay, and the action alarm current threshold is preset. The current standard value is 50mA. When the current of the PT secondary neutral line N600 is greater than the action alarm value 50mA, the relay is actuated, see Table 1; Table 1 Fixed value design Serial number Setting name Setting range Level difference Setting Value 1 Current determination value / mA 00.00-99.99 0.10 50.00 2 Abnormal detection delay time / s 0.06-99.99 0.01 0.50 3 Export delay time / s 0.06-99.99 0.01 0.50 The judgment logic and action start conditions are triggered when the current is greater than the set current judgment value, the default value is 50mA; ⑦ Storage unit module: The storage unit module stores the action events of the relay, which is convenient for querying the latest n (n≥20) fault information; ⑧ Alarm output unit module: The relay triggers the relay, the normally open node of the relay closes, triggering the alarm output, which is output to the public measurement and control device including the monitoring background signal alarm module and the telecontrol dispatching master station monitoring module. When the current collected by the online monitoring device exceeds the alarm setting current value, it is judged as multi-point grounding, and the microprocessor module triggers the relay K 1 Coil action, relay K 1 The normally open node is closed, triggering the N600 multi-point grounding alarm signal of the control loop to the public measurement and control device to close, the monitoring background light sign is lit, and the alarm window pops up the "N600 multi-point grounding" alarm information; ⑨Display module: displays the current and multi-point grounding information of the current substation PT secondary neutral line N600; ⑩ Power supply module: power supply processing module, the power supply processing module is connected to the acquisition module, amplification module, data conversion module and microcomputer processing module, the power supply module outputs DC 24V as the working power supply of the acquisition module, amplification module and data conversion module; outputs DC 48V as the working power supply of the microcomputer processing module; the power supply processing module provides the working power supply of the present invention, and adopts the DC power supply (110V or 220V) of the substation to ensure the stable operation of the working state of the device; Flow chart of the device of the present invention: The present invention realizes the real-time online monitoring function of the current flowing through the secondary neutral line N600 of the substation PT through a high-precision split current transformer, an acquisition module, an amplification module, a data conversion module, a microcomputer processing module, an automatic reset module, a time synchronization module, a fixed value setting module, a storage unit module, a data output module, an alarm output unit module, a display module, and an alarm indicator light. The microcomputer processing module has an analysis and judgment function, and compares and analyzes the current of the secondary neutral line N600 of the PT. If the current exceeds the set relay action current of 50mA, the relay will act to alarm, the alarm light sign of the backstage monitoring in the station will be lit, and the alarm window will pop up relevant alarm information, indicating that multiple points of grounding of the neutral point N600 have occurred; at the same time, the automatic reset module is set to relay K 1 The coil action is reset, so that the device in the alarm state is restored to the online monitoring working state. The setting of the monitoring background signal alarm module and the remote control dispatching master station monitoring module is conducive to uploading the collected and identified monitoring status to the dispatching master station server through the remote control device in the station, realizing accurate and efficient real-time monitoring of the grounding condition of the substation PT secondary neutral line N600, notifying the operation and maintenance personnel in time to eliminate safety hazards, reduce the false operation of out-of-zone fault protection, and improve work efficiency.

[0034] The box body 3 includes a base 31, a box shell 32 is arranged above the base 31, a carrying strap 33 is arranged in front of the box shell 32, angle irons 34 are arranged on both sides above the box shell 32, an opening 35 is arranged on the top of the box shell 32, and ventilation holes 36 are arranged on both sides of the opening 35.

[0035] A display 310 is arranged in front of the base 31, and a fan 311 is arranged below the display 310; an opening and closing cover 37 is arranged on the outside of the box shell 32, and a handle 38 is arranged above the opening and closing cover 37. The opening and closing cover 37 is movably connected to the box shell 32 through a hinge 39.

[0036] A flat plate 312 is arranged inside the box shell 32, a placing table 313 is arranged above the flat plate 312, stabilizing plates 314 are arranged on both sides below the placing table 313, rod sleeves 315 are arranged at the outer ends of the stabilizing plates 314, guide light rods 316 are arranged inside the rod sleeves 315, a wire sleeve 317 is arranged at the inner end of the stabilizing plate 314, a screw rod 318 is arranged inside the wire sleeve 317, and a public measurement and control device 319 is arranged at the lower part of the box shell 32.

[0037] The public measurement and control device 319 includes a remote dispatching main station monitoring module 91 and a monitoring background signal alarm module 92. The remote dispatching main station monitoring module 91 is connected to the monitoring background signal alarm module 92 via a cable 93. A rotating plate 94 is provided at the bottom of the monitoring background signal alarm module 92. One end of the rotating plate 94 is movably connected to the top of the remote dispatching main station monitoring module 91. A connecting joint 95 is provided above the monitoring background signal alarm module 92, and a signal light 96 is provided below the connecting joint 95.

[0038] The present invention is an intelligent online monitoring and diagnosis device for N600 multi-point grounding of a substation. During use, the present invention can be installed at a single-point grounding point of a voltage parallel panel of a substation to realize real-time and safe online monitoring of multi-point grounding current of an N600 circuit, intelligent diagnosis of multi-point grounding faults of an N600 circuit and alarm, preliminary positioning of multi-point grounding points, and uploading of monitoring data and alarm information to a monitoring background and a protection information substation, which is convenient for operation and maintenance personnel to handle in a timely and rapid manner, and has important practical significance for maintaining safe operation of a power grid and ensuring power supply reliability. The present invention has the advantages of reasonable structure, real-time online monitoring to realize fault diagnosis and alarm, preliminary positioning of multi-point grounding points, and ensuring power supply reliability.

Claims

1. A substation N600 multi-point grounding intelligent online monitoring and diagnosis device, which includes a body, a split current transformer and a box, and is characterized by: The body includes a lower bottom and an upper cover, a buckle is provided above the lower bottom, a 4-loop current acquisition terminal is provided in front of the upper cover, the 4-loop current acquisition terminal is connected to the corresponding open-and-close current transformer through a connecting line, a TF card is provided below the 4-loop current acquisition terminal, an alarm indicator light is provided on the left side of the 4-loop current acquisition terminal, and a working indicator light is provided on the left side of the alarm indicator light. Terminal blocks are provided on the upper and lower sides of the body, a 485 communication interface is provided on the terminal block below the body, and an AC voltage input terminal is provided on the terminal block above the body, and the AC voltage input terminal is connected to A, B, C, and N respectively through connecting lines.

2. A substation N600 multi-point grounding intelligent online monitoring and diagnosis device as claimed in claim 1, characterized in that: The body also includes an acquisition module, an amplification module, a data conversion module, a power processing module and a microcomputer processing module. The acquisition module is connected to the open-close current transformer, the acquisition module, the amplification module and the data conversion module are respectively connected to the power processing module, the acquisition module is connected to the amplification module, the amplification module is connected to the data conversion module, and the data conversion module is connected to the microcomputer processing module.

3. A substation N600 multi-point grounding intelligent online monitoring and diagnosis device as claimed in claim 2, characterized in that: The first output end of the microcomputer processing module is connected to the alarm output unit module, the second output end of the microcomputer processing module is respectively connected to the alarm indicator light and the display module, and the third output end of the microcomputer processing module is connected to the storage unit module.

4. A substation N600 multi-point grounding intelligent online monitoring and diagnosis device as claimed in claim 3, characterized in that: The first input end of the microcomputer processing module is connected to the automatic reset module, the second input end of the microcomputer processing module is connected to the timing module, and the third input end of the microcomputer processing module is connected to the fixed value setting module.

5. The substation N600 multi-point grounding intelligent online monitoring and diagnosis device according to claim 2, characterized in that: The amplification module adopts the LM332 operational amplifier.

6. A substation N600 multi-point grounding intelligent online monitoring and diagnosis device as claimed in claim 1, characterized in that: The box body comprises a base, a box shell is arranged above the base, a carrying strap is arranged in front of the box shell, angle irons are arranged on both sides above the box shell, an opening is arranged on the top of the box shell, and ventilation holes are arranged on both sides of the opening.

7. A substation N600 multi-point grounding intelligent online monitoring and diagnosis device as claimed in claim 6, characterized in that: A display is arranged in front of the base, and a fan is arranged below the display; an opening and closing cover is arranged on the outside of the box shell, a handle is arranged above the opening and closing cover, and the opening and closing cover is movably connected to the box shell through a hinge.

8. The intelligent online monitoring and diagnosis device for N600 multi-point grounding of a substation according to claim 7, characterized in that: A flat plate is arranged inside the box shell, a placing table is arranged above the flat plate, stabilizing plates are arranged on both sides below the placing table, rod sleeves are arranged at the outer ends of the stabilizing plates, guide light rods are arranged inside the rod sleeves, a wire sleeve is arranged at the inner end of the stabilizing plate, a wire rod is arranged inside the wire sleeve, and a public measurement and control device is arranged at the lower part of the box shell.

9. A substation N600 multi-point grounding intelligent online monitoring and diagnosis device as claimed in claim 8, characterized in that: The public measurement and control device includes a remote dispatching main station monitoring module and a monitoring background signal alarm module. The remote dispatching main station monitoring module is connected to the monitoring background signal alarm module through a cable. A rotating plate is provided at the bottom of the monitoring background signal alarm module. One end of the rotating plate is movably connected to the top of the remote dispatching main station monitoring module. A connecting joint is provided above the monitoring background signal alarm module, and a signal light is provided below the connecting joint.

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