A grounding equipotential box and its use method

Abstract

The present invention relates to a grounding equipotential box and its use method, comprising: a box body, on which a distribution ground terminal and a process ground terminal are provided; a switch assembly, disposed within the box body, with its two ends respectively connected to the distribution ground terminal and the process ground terminal, isolating the distribution ground from the process ground; a microcontroller module, disposed within the box body, with its output control end connected to the signal control end of the switch assembly; a first input end and a second input end of the microcontroller module respectively connected to the distribution ground terminal and the process ground terminal, for real-time detection of the voltage across the switch assembly; and a third input end connected to the process power distribution cabinet for detecting sudden current changes; the microcontroller module controls the operating state of the switch assembly based on the detected voltage and current signals, thereby achieving equipotentiality. The present invention can be applied in the field of accelerator grounding technology.

Description

Technical Field

[0001] The present invention relates to the technical field of accelerator grounding, and in particular to a grounding equipotential box and a use method thereof. Background Art

[0002] A heavy ion accelerator is a device that artificially accelerates heavy ions to form a heavy ion beam and is used to conduct heavy ion physics research. Heavy ion accelerators are crucial tools for understanding the deep structure of matter and have widespread applications in industry, agriculture, medicine, scientific research, and national defense.

[0003] In addition to ensuring safety, the grounding system in a heavy ion accelerator is also crucial for the electromagnetic compatibility of the device. The power distribution system of a heavy ion accelerator is usually TN-S, with overcurrent protection and high safety. However, due to the long PE line and high ground impedance, ground crosstalk problems may occur. A dedicated ground grid is usually laid in a heavy ion accelerator, and grounding is carried out nearby according to needs. This is called "process grounding", and the structure of its grounding system conforms to the TT standard. This solution can ensure good grounding performance, but when an equipment grounding fault occurs, it is not easy to detect it in time due to the small fault current. At the same time, there is a risk of generating a dangerous potential difference between the two types of grounding systems. If the TN-S standard is used for repeated grounding on the load side, although safety is improved, it will cause ground interference problems. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to provide a grounding equipotential box and its use method, which can enable the sensitive process equipment of the heavy ion accelerator device to operate according to the TT standard in normal times. When a grounding fault occurs or the potential difference between the two types of grounding systems exceeds the safety threshold, the grounding equipotential box can quickly switch to the TN-S repeated grounding mode or achieve equipotential.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a grounding equipotential box, comprising: a box body, on which a distribution ground terminal and a process ground terminal are provided; a switch assembly is arranged in the box body, and its two ends are respectively connected to the distribution ground terminal and the process ground terminal to isolate the distribution ground and the process ground; a micro-control module is arranged in the box body, and its output control end is connected to the signal control end of the switch assembly, the first input end and the second input end of the micro-control module are respectively connected to the distribution ground terminal and the process ground terminal, for real-time detection of the voltage at both ends of the switch assembly, and the third input end is connected to the process distribution cabinet for detecting sudden current; the micro-control module controls the working state of the switch assembly according to the detected voltage and current signals to achieve equipotential.

[0006] Further, the switch assembly includes a spark gap switch and a contact switch connected in parallel;

[0007] Two ends of the spark gap switch are respectively connected to the power distribution ground terminal and the process ground terminal;

[0008] The two ends of the contact switch are respectively connected to the power distribution ground terminal and the process ground terminal; the control end of the contact switch is the signal control end of the switch component, which is connected to the output control end of the microcontrol module.

[0009] Furthermore, the microcontrol module includes a microcontroller, a trigger, a current detection module, a voltage detection module and a current probe;

[0010] The input end of the current detection module is connected to the output end of the current probe, and the input end of the current probe is connected to the process power distribution cabinet as the third input end, for detecting sudden current changes and transmitting the sudden current to the microcontroller;

[0011] The two ends of the voltage detection module serve as the first input end and the second input end, respectively, and are connected to the power distribution ground terminal and the process ground terminal, and transmit the detected transient overvoltage peak value and power frequency voltage value between the power distribution ground and the process ground to the microcontroller;

[0012] The input end of the microcontroller is connected to the output end of the current detection module and the output end of the voltage detection module respectively, and the output end of the microcontroller is connected to the input end of the trigger, and the trigger is controlled to be turned on and off according to the received voltage and current signals;

[0013] The output end of the trigger is connected to the signal control end of the switch component for sending a driving signal to realize repeated grounding of the power distribution ground on the process ground side.

[0014] Furthermore, the current probe includes a signal line and a current sensor; the current sensor is arranged on the incoming neutral line and the process ground line in the process power distribution cabinet, and transmits the detected sudden current to the current detection module via the signal line.

[0015] Furthermore, the current probes are arranged in two or more groups to achieve isolation between two or more groups of different grounds.

[0016] Furthermore, a control screen is provided on the box body; the control screen is connected to the microcontroller MCU for information interaction, and is used for parameter setting and grounding equipotential box status display.

[0017] Furthermore, a communication interface is provided on the box; the communication interface is connected to the output end of the microcontroller MCU, and the data in the microcontroller MCU is uploaded to the background through the communication interface to realize remote control.

[0018] Furthermore, a power port is provided on the box; the power port is connected to the microcontroller module and is used to supply power to the microcontroller module.

[0019] A method for using the above-mentioned grounding equipotential box includes: detecting voltage signals at both ends of a switch assembly to obtain voltage signals between two or more electrical devices that need to establish an equipotential situation; installing current sensors on the incoming neutral line and process ground line in the process power distribution cabinet, so that when a ground fault occurs, the current sensors generate mutual induction current excitation signals for the ground fault current flowing through the neutral line or the process ground line, and obtain current signals between the two or more electrical devices that need to establish an equipotential situation; under normal operating conditions, the process grounding is isolated and grounded from the distribution ground system through the switch assembly; when a lightning surge occurs between the two grounds, equipotentiality is achieved through a spark gap switch; when the power frequency or DC potential difference between the two grounds exceeds a set safety threshold or a ground fault occurs in the equipment of the process grounding system, causing the monitored current to exceed the set safety threshold, the microcontroller triggers the contact switch to close quickly, thereby achieving repeated grounding of the distribution ground on the process ground side, and the protection device is activated; after the fault is resolved, the grounding equipotential box is manually or automatically reset through the control panel or background.

[0020] Furthermore, the safety threshold is set by the control panel or background.

[0021] The present invention has the following advantages due to the adoption of the above technical solution:

[0022] 1. The present invention can realize the switching function of the ground structure between the heavy ion accelerator process ground and the power distribution ground under different working conditions, taking safety and performance into comprehensive consideration.

[0023] 2. The voltage and current thresholds of the present invention are adjustable. The use requirements of different environments can be met by simply replacing the spark gap switch or increasing or decreasing the number of current sensors, and the present invention has good versatility.

[0024] 3. The present invention can achieve the isolation function of power frequency and high-frequency noise between the heavy ion accelerator process grounding system and the power distribution ground system under normal working conditions, which is of great significance for the realization of electromagnetic compatibility of the accelerator.

[0025] 4. The present invention provides a ground wire parameter testing basic platform for background data processing and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a grounding equipotential box in one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the grounding structure of a process power distribution cabinet in one embodiment of the present invention;

[0028] Figure 3This is a schematic diagram of the connection of the equipotential box of the grounding system in one embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of grounding mode switching in one embodiment of the present invention;

[0030] Reference numerals:

[0031] 1-Box; 1.2-Power distribution ground terminal; 1.3-Control panel; 1.4-Communication interface; 1.5-Process ground terminal; 1.6 Power port;

[0032] 2-Switch assembly; 2.1-Spark gap switch; 2.2-Contact switch;

[0033] 3- Microcontroller module; 3.1- Microcontroller MCU; 3.2- Trigger; 3.3- Current detection module; 3.4- Voltage detection module; 3.5- Current probe;

[0034] 4-Process power distribution cabinet; 4.1-Cabinet; 4.2-Neutral line (total); 4.3-Neutral line bus; 4.4-PE line (total); 4.5-PE bus; 4.6-Process ground bus; 4.7-Process ground line (total);

[0035] 5-Technical ground grid;

[0036] 6-Power distribution network. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] In one embodiment of the present invention, a grounding equipotential box is provided. Figures 1 to 3 As shown, the grounding equipotential box includes:

[0040] The box body 1 is provided with a distribution ground terminal 1.2 and a process ground terminal 1.5, which are connected to two types of grounding systems respectively through the distribution ground terminal 1.2 and the process ground terminal 1.5;

[0041] The switch assembly 2 is arranged in the box 1, and its two ends are respectively connected to the distribution ground terminal 1.2 and the process ground terminal 1.5, isolating the distribution ground network 6 from the process ground network 5;

[0042] The microcontrol module 3 is disposed in the housing 1. Its output control terminal is connected to the signal control terminal of the switch assembly 2. The first and second input terminals of the microcontrol module 3 are respectively connected to the distribution ground terminal 1.2 and the process ground terminal 1.5, and are used to detect the voltage across the switch assembly 2 in real time. The third input terminal is connected to the process power distribution cabinet 4 for detecting sudden current changes.

[0043] The microcontroller module 3 controls the working state of the switch assembly 2 according to the detected voltage and current signals to achieve equal potential.

[0044] In the above embodiment, the switch assembly 2 includes a spark gap switch 2.1 and a contact switch 2.2 connected in parallel. The two ends of the spark gap switch 2.1 are connected to the power distribution ground terminal 1.2 and the process ground terminal 1.5, respectively. The two ends of the contact switch 2.2 are connected to the power distribution ground terminal 1.2 and the process ground terminal 1.5, respectively. The control terminal of the contact switch 2.2 serves as the signal control terminal of the switch assembly 2 and is connected to the output control terminal of the microcontroller module 3.

[0045] In the above embodiment, the microcontroller 3 includes a microcontroller 3.1, a trigger 3.2, a current detection module 3.3, a voltage detection module 3.4, and a current probe 3.5. The input of the current detection module 3.3 is connected to the output of the current probe 3.5, and the input of the current probe 3.5 serves as a third input to the process power distribution cabinet 4 for detecting sudden current changes and transmitting them to the microcontroller 3.1. The two ends of the voltage detection module 3.4 serve as a first input and a second input, respectively connected to the distribution ground terminal 1.2 and the process ground terminal 1.5, transmitting the detected transient overvoltage peak and power frequency voltage between the distribution ground and the process ground to the microcontroller 3.1. The input of the microcontroller 3.1 is respectively connected to the output of the current detection module 3.3 and the output of the voltage detection module 3.4. The output of the microcontroller 3.1 is connected to the input of the trigger 3.2, controlling the on and off of the trigger 3.2 based on the received voltage and current signals. The output end of the trigger 3.2 is connected to the signal control end of the switch component 2, and is used to send a driving signal to achieve repeated grounding of the power distribution ground on the process ground side.

[0046] In the above embodiment, the current probe 3.5 includes a signal line and a current sensor. The current sensor is installed on the incoming neutral line 4.2 and the process ground line 4.7 in the process power distribution cabinet 4, and transmits the detected sudden current to the current detection module 3.3 via the signal line.

[0047] In the above embodiment, Figure 3 As shown, the current probes 3.5 are arranged in two or more groups to achieve isolation between two or more groups of different grounds.

[0048] In the above embodiment, a control panel 1.3 is provided on the box body 1. The control panel 1.3 is connected to the microcontroller MCU3.1 for information exchange and is used for parameter setting and grounding equipotential box status display.

[0049] In the above embodiment, the housing 1 is provided with a communication interface 1.4, which is connected to the output terminal of the microcontroller MCU3.1, and uploads data in the microcontroller MCU3.1 to the backend via the communication interface 1.4, thereby realizing remote control.

[0050] In this embodiment, the communication interface 1.4 can be in the form of an Ethernet port, USB, etc. as needed. To ensure reliability, this embodiment preferably uses optical fiber.

[0051] In the above embodiment, the box body 1 is provided with a power port 1.6, which is connected to the microcontroller module 3 and is used to supply power to the microcontroller module 3.

[0052] In summary, in this embodiment, under normal operating conditions, the two grounds are isolated and grounded via the switch assembly 2. Current detection module 3.3 and voltage detection module 3.4 respectively detect the voltage across the contactor switch (power frequency and DC), the process ground line, and the power frequency current of the N line in real time. When a high-frequency transient overvoltage occurs between the two grounds, the spark gap switch 2.1 quickly conducts, achieving equipotentiality. When a power frequency grounding fault occurs in the equipment in the process grounding system, the current probe 3.5 monitors the sudden current on the incoming neutral line 4.2 and the process ground line 4.7 in the process distribution cabinet 4. When the current exceeds the threshold, the microcontroller MCU3.1 generates a drive signal via the trigger 3.2 to control the contactor switch 2.2 to close, achieving repeated grounding of the distribution ground on the process ground side and triggering the upper protection device. The voltage detection module 3.4 is used to measure the transient overvoltage peak between the two grounds for data analysis and parameter optimization. Simultaneously, the power frequency voltage value between the two grounds is monitored. When the current exceeds the threshold, the microcontroller MCU3.1 controls the contactor switch 2.2 to close, achieving equipotentiality. The control panel 1.3 is used for parameter setting and grounding equipotential box status display; the microcontroller MCU3.1 uploads data to the background through the communication interface 1.4.

[0053] In one embodiment of the present invention, a method for using a grounding equipotential box is provided. The method is based on the grounding equipotential box in the above embodiments. Figure 4 As shown, the method includes the following steps:

[0054] 1) By detecting the voltage signal at both ends of the switch component 2, the voltage signal between two or more electrical devices where equipotential needs to be established is obtained;

[0055] The process grounding grid 5 is laid along the process system, with a grounding lead-out point located near the process power distribution cabinet. The process power distribution cabinet consists of a general power distribution cabinet and an additional process ground bar 4.6 insulated from cabinet 4.1, which serves as a grounding connection for process equipment. The process ground bar is connected to a grounding point on the process grounding grid 5 via a process ground line (total) 4.7. The neutral bar 4.3 and PE bar 4.5 within the process power distribution cabinet 4 are connected to the power cabinet in the upper-level power distribution room via 4.2-neutral line (total) and 4.4-PE line (total). The power distribution ground terminal 1.2 and the process ground terminal 1.5 are connected to the PE bar 4.5 and the process ground bar 4.6, respectively. Two sets of current sensors are used, connected to the neutral line (total) 4.2 and the process ground line (total) 4.7, respectively. The power port 1.6 is connected to the AC power supply. The communication interface 1.4 is selected based on the actual communication line to be connected.

[0056] Preferably, Figure 3 As shown, the grounding equipotential box can also be used to achieve joint and isolated grounding between independently laid grounding grids;

[0057] 2) By installing current sensors on the incoming neutral line 4.2 and the process ground line 4.7 in the process power distribution cabinet 4, when a ground fault occurs, the current sensors generate a mutual induction current excitation signal for the ground fault current flowing through the neutral line or the process ground line, and obtain the current signal between the two or more electrical devices where equipotentiality needs to be established;

[0058] When a ground fault occurs, the current sensor generates a mutual induction current excitation signal for the ground fault current flowing through the neutral wire or process ground wire;

[0059] 3) Under normal operating conditions, the process ground is isolated from the power distribution system through the switch assembly;

[0060] 4) When a lightning surge occurs between the two grounds, spark gap switch 2.1 achieves equipotentiality. When the power frequency or DC potential difference between the two grounds exceeds a set safety threshold, or a ground fault occurs in equipment in the process grounding system, causing the monitored current to exceed a set safety threshold, microcontroller 3.1 triggers contact switch 2.2 to quickly close, achieving double grounding of the distribution ground on the process ground side and triggering device protection.

[0061] 5) After the fault is eliminated, the grounding equipotential box can be reset manually or automatically through the control panel 1.3 or the background.

[0062] In the above step 4), the safety threshold is set by the control panel 1.3 or the background.

[0063] In the above embodiment, before step 5), a data storage and transmission step is also included: the grounding equipotential box status, monitored voltage and current parameters are uploaded to the background through the communication interface 1.4 for data analysis and optimization.

[0064] In this embodiment, the power frequency and DC voltage thresholds, as well as the power frequency current mutation thresholds for the neutral line and process ground line, are set through the control panel 1.3 or the backend. The setting of the thresholds is based on actual project needs. The high-frequency transient voltage threshold is determined when the spark gap switch 2.1 is selected based on the actual needs of the grounding system and can be optimized later based on test data.

[0065] The system provided in this embodiment is used to execute the above-mentioned method embodiments. Please refer to the above-mentioned embodiments for specific processes and detailed contents, which will not be repeated here.

[0066] In summary, the grounding equipotential box of the present invention enables the sensitive process equipment of the heavy ion accelerator device to operate according to the TT standard at ordinary times. When a grounding fault occurs or the potential difference between the two types of grounding systems exceeds the safety threshold, the grounding equipotential box can quickly switch to the TN-S repeated grounding mode or achieve equipotentiality, which is very important for ensuring the safety of the heavy ion accelerator and the electromagnetic compatibility performance.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A grounding equipotential box, characterized in that: include: A box body (1) is provided with a power distribution ground terminal (1.2) and a process ground terminal (1.5); A switch assembly (2) is arranged in the box (1), with two ends respectively connected to the power distribution ground terminal (1.2) and the process ground terminal (1.5), thereby isolating the power distribution ground from the process ground; A micro-control module (3) is arranged in the box (1), and its output control end is connected to the signal control end of the switch assembly (2); a first input end and a second input end of the micro-control module (3) are respectively connected to the power distribution ground terminal (1.2) and the process ground terminal (1.5) for real-time detection of the voltage across the switch assembly (2); and a third input end is connected to the process power distribution cabinet (4) for detecting sudden current changes; The microcontrol module (3) controls the working state of the switch component (2) according to the detected voltage and current signals to achieve equipotentiality; The switch assembly (2) comprises a spark gap switch (2.1) and a contact switch (2.2) connected in parallel; Two ends of the spark gap switch (2.1) are respectively connected to the power distribution ground terminal (1.2) and the process ground terminal (1.5); The two ends of the contact switch (2.2) are respectively connected to the power distribution ground terminal (1.2) and the process ground terminal (1.5); the control end of the contact switch (2.2) is the signal control end of the switch component (2), which is connected to the output control end of the microcontrol module (3); The microcontrol module (3) includes a microcontroller (3.1), a trigger (3.2), a current detection module (3.3), a voltage detection module (3.4) and a current probe (3.5); The input end of the current detection module (3.3) is connected to the output end of the current probe (3.5), and the input end of the current probe (3.5) is connected to the process power distribution cabinet (4) as the third input end, for detecting sudden current changes and transmitting the sudden current to the microcontroller (3.1); The two ends of the voltage detection module (3.4) serve as the first input end and the second input end, respectively, and are connected to the power distribution ground terminal (1.2) and the process ground terminal (1.5), respectively, and transmit the detected transient overvoltage peak value and power frequency voltage value between the power distribution ground and the process ground to the microcontroller (3.1); The input end of the microcontroller (3.1) is respectively connected to the output end of the current detection module (3.3) and the output end of the voltage detection module (3.4), and the output end of the microcontroller (3.1) is connected to the input end of the trigger (3.2), and the trigger (3.2) is controlled to be turned on and off according to the received voltage and current signals; The output end of the trigger (3.2) is connected to the signal control end of the switch component (2) and is used to send a drive signal to achieve repeated grounding of the power distribution ground on the process ground side.

2. The grounding equipotential box according to claim 1, characterized in that: The current probe (3.5) comprises a signal line and a current sensor; the current sensor is arranged on the incoming neutral line (4.2) and the process ground line (4.7) in the process power distribution cabinet (4), and transmits the detected sudden change current to the current detection module (3.3) via the signal line.

3. The grounding equipotential box according to claim 1 or 2, characterized in that: The current probes (3.5) are arranged in two or more groups to achieve isolation between two or more groups of different grounds.

4. The grounding equipotential box according to claim 1, characterized in that: A control screen (1.3) is provided on the box body (1); the control screen (1.3) is connected to the microcontroller (3.1) for information exchange and is used for parameter setting and grounding equipotential box status display.

5. The grounding equipotential box according to claim 1, characterized in that: The box (1) is provided with a communication interface (1.4); the communication interface (1.4) is connected to the output end of the microcontroller (3.1), and data in the microcontroller (3.1) is uploaded to the backend via the communication interface (1.4), thereby realizing remote control.

6. The grounding equipotential box according to claim 1, characterized in that: The box (1) is provided with a power port (1.6); the power port (1.6) is connected to the microcontrol module (3) and is used to supply power to the microcontrol module (3).

7. A method for using the grounding equipotential box according to any one of claims 1 to 6, characterized in that: include: By detecting the voltage signal at both ends of the switch component (2), a voltage signal between two or more electrical devices where an equipotential situation needs to be established is obtained; By installing current sensors on the incoming neutral line (4.2) and the process ground line (4.7) in the process power distribution cabinet (4), when a ground fault occurs, the current sensors generate a mutual induction current excitation signal for the ground fault current flowing through the neutral line or the process ground line, and obtain the current signal between two or more electrical devices where equipotential conditions need to be established; Under normal working conditions, the process ground is isolated from the power distribution system through the switch assembly; When a lightning surge occurs between the two grounds, the spark gap switch (2.1) achieves equipotentiality; when the power frequency or DC potential difference between the two grounds exceeds the set safety threshold or a ground fault occurs in the equipment of the process grounding system, causing the monitoring current to exceed the set safety threshold, the microcontroller (3.1) triggers the contact switch (2.2) to close quickly, achieving repeated grounding of the distribution ground on the process ground side, and the protection device is activated; After the fault is eliminated, the grounding equipotential box can be reset manually or automatically through the control panel (1.3) or the background.

8. The method of use according to claim 7, wherein: The safety threshold is set by the control panel (1.3) or the background.

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