System and method for testing grounding impedance of process grounding system ground loop

Abstract

This application provides a grounding impedance testing system and method for a process grounding system. The system includes: an impedance analyzer, used to provide an excitation signal of a specified frequency required for testing, and to measure the voltage and current between a first grounding grid lead-out point and a second grounding grid lead-out point set on the process grounding grid of a particle accelerator grounding system; a test fixture, connected to the impedance analyzer via connecting lines, used to connect the first grounding grid lead-out point and the second grounding grid lead-out point to the impedance analyzer via test leads and auxiliary test leads, and used to inject an excitation signal into the impedance analyzer and measure the excitation signal; and an impedance analyzer control module, connected to the impedance analyzer, used to control the test parameters and procedures of the impedance analyzer, read and process the measurement data of the impedance analyzer, obtain the grounding impedance between the first grounding grid lead-out point and the second grounding grid lead-out point at a specified frequency, and generate a impedance frequency curve.

Description

Technical Field

[0001] This invention relates to the intersection of particle accelerator technology and grounding technology, and more specifically, to a system and method for testing the grounding impedance of a process grounding system ground loop. Background Technology

[0002] As a precision large-scale device, the process grounding system of a particle accelerator is a key support for ensuring stable operation, suppressing electromagnetic interference, and avoiding signal distortion or equipment failure caused by grounding loops. It is directly related to the operational reliability and measurement accuracy of the particle accelerator interconnection subsystem, and the requirement for accurate characterization of grounding impedance parameters is extremely high.

[0003] Existing grounding impedance testing technologies mainly focus on power frequency grounding resistance measurement, which can only obtain grounding performance parameters under a single power frequency. They cannot cover the critical frequency range faced by the ground loop in the actual operation of the particle accelerator process grounding network. This frequency band is precisely the critical frequency range for electromagnetic coupling of signal transmission between particle accelerator subsystems.

[0004] The aforementioned technical limitations directly lead to two major problems. First, it is impossible to accurately quantify the grounding impedance characteristics of ground loops between different lead-out points of the process grounding network in the critical frequency band, resulting in a lack of comprehensive and effective data for evaluating the quality of the process grounding system. Second, due to the lack of ground loop impedance data for the corresponding frequency band, key aspects such as the positioning of electromagnetic interference sources and the anti-interference design of weak signal transmission circuits in particle accelerators are prone to redundancy or insufficient protection in the grounding system design, which in turn affects the overall operational stability and measurement accuracy of the particle accelerator and makes it difficult to meet the high-precision technical requirements of the particle accelerator for the process grounding system. Summary of the Invention

[0005] The purpose of this invention is to provide a grounding impedance testing system for a particle accelerator process grounding system, comprising: an impedance analyzer for providing an excitation signal of a specified frequency required for testing, and measuring the voltage and current between a first grounding grid lead-out point and a second grounding grid lead-out point set on the process grounding grid of the particle accelerator grounding system; a test fixture connected to the impedance analyzer via connecting lines, for connecting the first grounding grid lead-out point and the second grounding grid lead-out point to the impedance analyzer via test lines and auxiliary test lines respectively, and for injecting the excitation signal into the impedance analyzer and measuring the excitation signal; an impedance analyzer control module connected to the impedance analyzer for controlling the test parameters and procedures of the impedance analyzer, reading and processing the measurement data of the impedance analyzer, obtaining the grounding impedance between the first grounding grid lead-out point and the second grounding grid lead-out point at the specified frequency, and generating a impedance frequency curve; and an insulator for laying and securing the auxiliary test lines.

[0006] The system includes an impedance analyzer storage medium for storing data obtained from the impedance analyzer tests.

[0007] The test data of the impedance analyzer is stored in the impedance analyzer storage medium; the impedance analyzer control module is connected to the impedance analyzer storage medium and reads the test data from the impedance analyzer storage medium.

[0008] The test lead and the auxiliary test lead are low-impedance measurement signal lines; the termination points between the test lead and the first grounding grid lead-out point and between the auxiliary test lead and the second grounding grid lead-out point are bolted together with conductive adhesive.

[0009] The present invention also provides a test method for a process grounding system ground loop grounding impedance test system according to an embodiment of the present invention, comprising: connecting a first equipment subsystem and a second equipment subsystem to a first grounding grid lead-out point and a second grounding grid lead-out point respectively through equipment grounding wires; connecting the first equipment subsystem and the second equipment subsystem through interconnecting cables; emitting an excitation signal of a predetermined frequency between the first grounding grid lead-out point and the second grounding grid lead-out point; measuring the voltage between the first grounding grid lead-out point and the second grounding grid lead-out point; measuring the current flowing between the first grounding grid lead-out point and the second grounding grid lead-out point; and obtaining the grounding impedance of the particle accelerator process grounding grid between the first grounding grid lead-out point and the second grounding grid lead-out point at the predetermined frequency.

[0010] This also includes: providing an excitation signal of a specified frequency required for the test; and measuring the voltage between the first grounding grid lead-out point and the second grounding grid lead-out point. and current ;calculate , which serves as the grounding impedance between the first grounding grid lead-out point and the second grounding grid lead-out point at the specified frequency.

[0011] The calibration of the test system before providing the excitation signal of the specified frequency required for the test includes: disconnecting the test lead from the auxiliary test lead before terminating the test lead and the auxiliary test lead with the first grounding grid lead-out point and the second grounding grid lead-out point, respectively; recording the inherent impedance of the test fixture, the test lead, and the auxiliary test lead using the zeroing function of the impedance analyzer; short-circuiting the test lead and the auxiliary test lead together; recording the inherent impedance of the test fixture, the test lead, and the auxiliary test lead using the zeroing function of the impedance analyzer; and terminating the test lead and the auxiliary test lead with the first grounding grid lead-out point and the second grounding grid lead-out point, respectively.

[0012] The process further includes: setting the signal frequency range of the impedance analyzer before testing; independently performing a preset number of measurements on the first grounding grid lead-out point and the second grounding grid lead-out point; confirming the validity of the measurement data by determining that no impedance value jump occurs at a specific frequency point in the measurement data of the preset number of measurements; and verifying the line by determining that an impedance value jump occurs at a specific frequency point in the measurement data of the preset number of measurements.

[0013] The process further includes plotting the impedance frequency curve of the ground loop before the test ends. Specifically, this involves reading multiple sets of measurement data from the impedance analyzer, wherein the measurement data consists of data pairs consisting of a specified frequency and the corresponding ground loop impedance value; mapping the multiple sets of measurement data one by one in a coordinate system where the horizontal axis is the signal frequency and the vertical axis is the ground loop impedance value, and plotting the impedance frequency curve of the ground loop.

[0014] The present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements all or part of the steps of the method for testing the ground loop grounding impedance of a particle accelerator process grounding system according to the above embodiments.

[0015] This invention addresses the grounding impedance testing requirements of ground loops in particle accelerator process grounding systems. It utilizes an impedance analyzer to provide excitation signals in the 50Hz-150kHz frequency band, moving beyond the limitations of existing technologies that can only test power frequency grounding resistance. This precisely covers the critical frequency bands for signal transmission and electromagnetic coupling in the actual operation of the ground loop in the particle accelerator process grounding network, fully meeting the frequency band adaptation requirements for grounding impedance testing in this scenario. Regarding improved testing accuracy, the test fixtures, test leads, and auxiliary test leads are calibrated with open and short circuits before testing, and their inherent impedance is recorded and zeroed. This effectively eliminates interference from the cable's own impedance on the measurement results. Furthermore, the termination points of the test leads, auxiliary test leads, and grounding network leads are crimped with conductive adhesive bolts, further reducing the impact of termination impedance and ensuring the accuracy of voltage and current measurements between the first and second grounding network leads. This provides a strong guarantee for the reliability of the grounding impedance calculation results. Regarding data validity and intuitiveness, by performing a preset number of independent measurements on the same grounding lead point, the system verifies whether there are impedance value jumps at specific frequencies. This allows for the filtering of valid measurement data, avoiding interference from abnormal data in the judgment. Furthermore, it can read multiple sets of data pairs consisting of specified frequencies and corresponding ground loop impedances, plotting impedance-frequency curves to intuitively present the ground loop impedance characteristics at different frequencies, providing a clear and intuitive basis for the status assessment of the process grounding system. In addition, the quantitative grounding impedance data provided by this invention can directly serve the quality evaluation of the particle accelerator process grounding network, assisting in the location of electromagnetic interference sources and the optimization of anti-interference design for weak signal transmission circuits. This reduces redundancy or insufficient protection in the grounding system design, helping to improve the operational stability and overall measurement accuracy of the particle accelerator interconnect subsystem. Simultaneously, the system's accompanying impedance analyzer storage medium and non-transitory computer-readable storage medium effectively preserve the data generated during the test, facilitating subsequent data retrieval, traceability, and in-depth analysis. This further enhances the practicality and ease of application of the technology, better adapting to the actual needs of particle accelerator process grounding system testing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the ground loop grounding impedance definition system involved in the present invention.

[0018] Figure 2 This invention relates to a block diagram of a ground loop grounding impedance testing system for particle accelerator process grounding systems.

[0019] Figure 3 This invention relates to a flowchart of a method for testing the grounding impedance of a ground loop in a particle accelerator process grounding system.

[0020] Figure 4 This invention relates to a ground loop grounding impedance testing system and test setup diagram for particle accelerator process grounding systems.

[0021] Figure 5 This is a schematic diagram of the setup for testing the grounding impedance of a ground loop in a particle accelerator process grounding system, according to a specific embodiment of the present invention.

[0022] Figure 6 This is a impedance frequency characteristic curve plotted in a specific embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100. Process grounding grid; 110. First grounding grid lead-out point; 120. Second grounding grid lead-out point; 130. Equipment grounding wire; 140. Interconnecting cable; 150. Ground loop; 160. Signal with frequency f; 170. Grounding impedance of ground loop; 180. First equipment subsystem; 190. Second equipment subsystem; 200. Grounding impedance test system for particle accelerator process grounding system; 210. Impedance analyzer; 220. Test fixture; 230. Impedance analyzer control module; 240. Impedance analyzer storage medium; 250. Insulator; 260. Test lead; 270. Auxiliary test lead; 280. Connecting wire; 290. Data line; 300. Coaxial cable; 301. Shielding layer; 302. Inner conductor. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] Before describing the grounding impedance test system and method for the ground loop of the particle accelerator process grounding system of the present invention, the definition of the grounding impedance of the ground loop of the particle accelerator process grounding system will be explained first. Figure 1 This is a schematic diagram of the ground loop grounding impedance definition system involved in this invention. Figure 1As shown in the figure, a process grounding grid 100 is included, with a first grounding grid lead-out point 110 and a second grounding grid lead-out point 120. A first equipment subsystem 180 is connected to the first grounding grid lead-out point 110 via an equipment grounding wire 130, and a second equipment subsystem 190 is connected to the second grounding grid lead-out point 120 via the equipment grounding wire 130. The first equipment subsystem 180 and the second equipment subsystem 190 are connected via an interconnecting cable 140, thus forming a ground loop 150 between the process grounding grid 100, the equipment grounding wire 130, the interconnecting cable 140, the first grounding grid lead-out point 110, and the second grounding grid lead-out point 120. The figure also includes a frequency of... The signal is 160, and the frequency is... Signal 160 corresponds to a voltage With current The ground loop impedance of 170Ω refers to the impedance at a frequency of... Under the action of signal 160, the impedance measured between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 is specifically valued using the formula. The grounding impedance characteristics at a specific frequency between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120, which are used to characterize the particle accelerator process grounding grid 100, are calculated.

[0027] The following describes the grounding impedance test system and method for the grounding impedance of the particle accelerator process grounding system, based on the definition of grounding impedance of the grounding loop in the particle accelerator process grounding system mentioned above.

[0028] Figure 2 This invention relates to a block diagram of a ground loop grounding impedance testing system for particle accelerator process grounding systems. (See diagram for reference.) Figure 2 As shown, the grounding impedance testing system 200 for the ground loop of a particle accelerator process grounding system includes: an impedance analyzer 210, used to provide an excitation signal of a specified frequency required for testing, and to measure the voltage and current between a first grounding grid lead-out point 110 and a second grounding grid lead-out point 120 set on the process grounding grid 100 of the particle accelerator grounding system; a test fixture 220, connected to the impedance analyzer 210 via a connecting line 280, used to connect the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 to the impedance analyzer 210 via test lines 260 and auxiliary test lines 270 respectively, and used to inject an excitation signal into the impedance analyzer 210 and measure the excitation signal; and an impedance analyzer control module 230, connected to the impedance analyzer 210, used to control the test parameters and process of the impedance analyzer 210, read and process the measurement data of the impedance analyzer 210, obtain the grounding impedance between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 at a specified frequency, and generate a impedance frequency curve.

[0029] Specifically, the excitation signal frequency output by the impedance analyzer 210 covers 50Hz-150kHz, which can accurately match the key frequency band of the actual operation of the ground loop 150 of the particle accelerator process grounding grid 100. When measuring the voltage and current between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120, it can simultaneously collect multiple sets of frequency and corresponding electrical parameter data, providing a basis for subsequent impedance calculations. The test fixture 220, as a component for signal transmission and connection, achieves stable docking with the impedance analyzer 210 through the connecting line 280. The test line 260 and the auxiliary test line 270 connected to it are both low-impedance measurement signal lines, which can reduce the interference of their own impedance on the test results. Moreover, the termination points of the test line 260 and the first grounding grid lead-out point 110, and the auxiliary test line 270 and the second grounding grid lead-out point 120, are all bolted with conductive adhesive, which can significantly reduce the measurement error caused by the termination impedance.

[0030] According to an embodiment of the present invention, the system includes: an impedance analyzer storage medium 240 for storing data obtained by the impedance analyzer 210; and an insulator 250 for laying and securing auxiliary test leads 270.

[0031] Specifically, the system also includes an impedance analyzer storage medium 240 and an insulator 250. The impedance analyzer storage medium 240 is connected to the impedance analyzer 210 and is used to store the voltage, current, frequency, and calculated impedance data generated during the test in real time. Simultaneously, the impedance analyzer control module 230 is connected to the impedance analyzer storage medium 240 and can directly read the stored data for subsequent processing. The insulator 250 is used for laying and securing the auxiliary test leads 270, preventing unnecessary conductive contact between the auxiliary test leads 270 and other components, ensuring the independence of the test circuit and the accuracy of signal transmission.

[0032] According to an embodiment of the present invention, the test data of the impedance analyzer 210 is stored in the impedance analyzer storage medium 240; the impedance analyzer control module 230 is connected to the impedance analyzer storage medium 240 and reads the test data in the impedance analyzer storage medium 240.

[0033] Specifically, all kinds of data collected and generated in real time by the impedance analyzer 210 during the test are synchronously stored in the impedance analyzer storage medium 240. These data include, but are not limited to, excitation signal parameters within a specified frequency range and the voltage between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120. Data, current The data includes calculated ground loop impedance values, pre-test calibration data, and parameter setting records during the test. The impedance analyzer control module 230 and the impedance analyzer storage medium 240 use a stable wired connection to ensure no data loss or interference during data retrieval. This allows for real-time retrieval of dynamic data during the test for immediate processing and impedance calculation, as well as the ability to read complete historical data for post-test analysis. This data storage and retrieval mechanism not only provides complete data support for generating impedance-frequency curves but also enables long-term retention of test data, facilitating subsequent traceability and verification of test results, and enabling in-depth data mining based on the operational status of the particle accelerator process grounding system, further enhancing the practicality and reliability of the testing technology. The impedance analyzer control module 230 can not only preset parameters such as the test frequency range and the number of measurements but also use built-in algorithms to process the read voltage... and current The data is calculated to obtain the specific value of the grounding impedance of the ground loop of 170Ω. Based on multiple sets of frequency and impedance data pairs, an intuitive impedance-frequency curve is automatically generated, providing a clear basis for test result analysis and process grounding system evaluation.

[0034] According to an embodiment of the present invention, the test line 260 and the auxiliary test line 270 are low-impedance measurement signal lines; the termination points between the test line 260 and the first grounding grid lead-out point 110 and between the auxiliary test line 270 and the second grounding grid lead-out point 120 are bolted together with conductive adhesive.

[0035] Specifically, test lead 260 and auxiliary test lead 270 are made of high-conductivity material and are specially designed as low-impedance measurement signal lines. Their impedance remains stable and extremely low within the 50Hz-150kHz test frequency band, minimizing the impact of the cable's own impedance on the measurement circuit, avoiding attenuation or distortion during signal transmission, ensuring accurate transmission of the excitation signal to the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120, and simultaneously ensuring voltage... and current The accuracy of the measurements is ensured. For the termination process, the connection between test lead 260 and the first grounding grid lead-out point 110, and between auxiliary test lead 270 and the second grounding grid lead-out point 120, both employ a dual fixing method combining conductive adhesive and bolt crimping. The conductive adhesive fills the tiny gaps in the contact surface of the termination points, eliminating the additional impedance caused by the contact gaps, while also enhancing conductivity and oxidation resistance. The bolt crimping provides stable and uniform pressure, ensuring a firm connection and preventing contact resistance fluctuations due to vibration, loosening, or other factors during testing. This termination design effectively reduces the interference of termination impedance on the measurement results, further ensuring the accuracy of the ground loop impedance 170 calculation, and providing crucial support for the high-precision measurement of the entire testing system.

[0036] The present invention also provides a test method for a ground loop grounding impedance test system for a particle accelerator process grounding system according to the above embodiments. Figure 3 This invention relates to a flowchart of a method for testing the grounding impedance of a ground loop in a particle accelerator process grounding system, as shown in the figure. Figure 3 As shown, the process includes: in step S310, connecting the first equipment subsystem 180 and the second equipment subsystem 190 to the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 respectively via equipment grounding wire 130; in step S320, connecting the first equipment subsystem 180 and the second equipment subsystem 190 via interconnecting cable 140; in step S330, emitting an excitation signal of a predetermined frequency between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120; in step S340, measuring the voltage between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120; in step S350, measuring the current flowing between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120; and in step S360, obtaining the grounding impedance of the particle accelerator process grounding grid 100 between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 at a predetermined frequency.

[0037] It is important to clarify that a test environment needs to be set up before conducting tests. Figure 4 This invention relates to a schematic diagram of a ground loop grounding impedance testing system and test setup for particle accelerator process grounding systems. The following is in conjunction with... Figure 4 The test method of the present invention will be described. For example... Figure 4 As shown, the test environment setup needs to be implemented step by step according to the established process, focusing on component functional adaptation and anti-interference requirements, as detailed below:

[0038] First, the components are positioned and placed. The impedance analyzer 210 is placed in a stable area away from the process grounding grid 100 and related operating equipment of the particle accelerator, ensuring sufficient distance between it and the edge of the process grounding grid 100 to avoid electromagnetic signals generated by the equipment operation from coupling interference to the test. At the same time, the environment in which the impedance analyzer 210 is located is well-ventilated, maintaining suitable temperature and humidity conditions to prevent temperature and humidity fluctuations from affecting its measurement accuracy. The test fixture 220 is fixed on an insulating support, with the bottom of the support insulated from the ground. The shortest distance between the test fixture 220 and the process grounding grid 100 and the equipment grounding wire 130 must meet the preset requirements to prevent accidental conduction or stray capacitance interference to the test. The impedance analyzer control module 230 is placed on the operating table next to the impedance analyzer 210, with the distance between them controlled within a range that facilitates operation and connection, providing convenience for subsequent data line connection and parameter adjustment.

[0039] Next, perform precise interconnection of the lines. The first step is to connect the signal transmission lines: using connecting cable 280, firmly connect the signal output / input interface of the impedance analyzer 210 to the corresponding interface of the test fixture 220. After connection, check the interface connection status to ensure there is no looseness to guarantee stable signal transmission. Then, connect one end of the test lead 260 to the designated interface of the test fixture 220, and connect the other end to the first grounding grid lead-out point 110 using conductive adhesive bolts. During the crimping process, ensure the conductive adhesive evenly covers the contact surface, and tighten the bolts appropriately to eliminate contact gaps. Connect one end of the auxiliary test lead 270 to another designated interface of the test fixture 220, and connect the other end to the second grounding grid lead-out point 120 using the same conductive adhesive bolt crimping method. The test lead 260 and the auxiliary test lead 270 must maintain a neat orientation to avoid crossing or tangling, thus reducing the impact of mutual inductance on the test. The second step is to connect the data and storage lines: Connect the data output interface of the impedance analyzer 210 to the data input interface of the impedance analyzer control module 230 using data cable 290 to ensure unobstructed data transmission. The impedance analyzer storage medium 240 is embedded inside the impedance analyzer 210. After connection, the read / write function of the storage medium needs to be tested through the impedance analyzer control module 230 to ensure that test data can be stored in real time. Data cable 290 includes a dedicated computer data cable, which is used to connect another set of data output interfaces of the impedance analyzer 210 to an external computer. The external computer serves as a data interaction and operation auxiliary terminal during the testing process, and can read the excitation signal parameters and voltage transmitted by the impedance analyzer 210 in real time. Current It can provide preliminary impedance data and, in conjunction with the impedance analyzer control module 230, enable the visualization setting of test parameters such as frequency range and number of measurements. It can also synchronously back up key test data to local computer storage, forming a dual data protection system with the impedance analyzer storage medium 240, thereby improving the security of data retention and the convenience of subsequent retrieval and analysis.

[0040] Anti-interference reinforcement measures are then implemented. For the auxiliary test line 270, insulators 250 are used for the entire laying and securing process. The insulators 250 must be evenly distributed along the path of the auxiliary test line 270. There is no fixed standard for the number of insulators 250 used; it must be flexibly determined based on the actual laying length of the auxiliary test line 270, the spatial layout around the process grounding grid 100 (e.g., whether there are obstacles to avoid), and the required flatness of the auxiliary test line 270. This ensures that each section of the auxiliary test line 270 is stably supported by the insulators 250, and that the spacing between adjacent insulators 250 does not cause the auxiliary test line 270 to sag due to its own weight and approach the process grounding grid 100 or surrounding metal structures. The reference height of insulator 250 is 10cm, which can be flexibly adjusted according to the actual situation such as the size of the on-site laying space, the actual distance requirements between the auxiliary test line 270 and the surrounding metal structure, and the laying height of the process grounding grid 100. This ensures that the auxiliary test line 270 maintains a preset distance from the process grounding grid 100, the equipment grounding wire 130, and the surrounding metal structure, thereby eliminating the formation of additional conductive loops from the root. At the same time, the exposed parts of the test line 260 and the auxiliary test line 270 are covered with a shielding structure. One end of the shielding structure needs to be connected to an independent protective grounding electrode, that is, it is set separately from the process grounding grid 100, and the other end is kept suspended, thereby reducing the interference of external electromagnetic radiation on the cable signal transmission.

[0041] To avoid interference with impedance measurement accuracy from non-test equipment connected to the ground loop 150, before performing equipment subsystem connection operations, it is necessary to disconnect the non-test-related equipment connected to the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120, such as existing redundant grounding cables and temporarily connected monitoring instruments. After disconnection, wrap the exposed metal parts at the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 with insulating tape to prevent accidental conductivity or oxidation. This ensures that the subsequent closed ground loop 150 is formed only by the test-related components, namely the equipment grounding wire 130, the first equipment subsystem 180, the second equipment subsystem 190, and the interconnecting cable 140.

[0042] Next, complete the equipment subsystem connection. Check the connection status between the first equipment subsystem 180 and the first grounding grid lead-out point 110 to ensure that the first equipment subsystem 180 is firmly connected to the first grounding grid lead-out point 110 through the equipment grounding wire 130; similarly, check the connection between the second equipment subsystem 190 and the second grounding grid lead-out point 120 to ensure that the second equipment subsystem 190 is reliably connected to the second grounding grid lead-out point 120 through the equipment grounding wire 130; then, use the interconnecting cable 140 to connect the signal port of the first equipment subsystem 180 to the corresponding signal port of the second equipment subsystem 190 to form a complete ground loop 150. After connection, the continuity of the interconnecting cable 140 needs to be tested with a special tool to ensure that there are no broken lines, and the shielding layer of the interconnecting cable 140 needs to be connected to the designated grounding terminal as required.

[0043] Finally, a comprehensive environmental status check is performed. Using specialized instruments, the continuity and impedance of test lead 260 and auxiliary test lead 270 are measured to confirm that their impedance meets design requirements and there are no broken wires. A self-test command is sent from the impedance analyzer control module 230 to the impedance analyzer 210 to check whether the excitation signal output function and voltage and current measurement function of the impedance analyzer 210 are normal. All termination points are checked one by one, including the connection between the test lead and the grounding grid lead-out point, and the connection between the connecting wire and the interface, to confirm that there are no loose connections or problems such as detached conductive adhesive. Once all check items meet the requirements, the test environment setup is complete, and subsequent testing procedures can begin.

[0044] In one specific embodiment, the first device subsystem 180 corresponds to the upper-level cabinet; the second device subsystem 190 corresponds to the front-end amplifier; and the interconnect cable 140 corresponds to the coaxial cable 300, wherein the coaxial cable 300 includes an outer conductor, namely a shielding layer 301, and an inner conductor 302. Figure 5 This is a schematic diagram of the setup for testing the grounding impedance of a ground loop in a particle accelerator process grounding system, according to a specific embodiment of the present invention.

[0045] The following description, using this embodiment as an example, elaborates on the test method of the ground loop grounding impedance test system for particle accelerator process grounding systems involved in this invention. Specifically, in conjunction with... Figure 3 The test method flowchart shown illustrates the actual connection scenario between the first equipment subsystem 180 (upper-level cabinet), the second equipment subsystem 190 (front-end amplifier), and the coaxial cable 300. The test procedure must strictly follow the operating specifications and technical parameters set by the system. Specific implementation details are as follows:

[0046] First, a stable connection is established between the upper-level cabinet, the front-end amplifier, and the grounding grid lead-out point. This is the fundamental step in constructing the test circuit. The upper-level cabinet, which serves as the first equipment subsystem 180, is connected to the first grounding grid lead-out point 110 on the process grounding grid 100 via the equipment grounding wire 130. Before connection, the metal contact surface of the first grounding grid lead-out point 110 must be thoroughly cleaned to remove the surface oxide layer and dust impurities, preventing impurities from increasing contact resistance and affecting test accuracy. Considering the low impedance transmission requirement, the equipment grounding wire 130 is a multi-strand copper cable with a cross-sectional area ≥4mm². Its terminals are fixed to the first grounding grid lead-out point 110 using a bolt crimping method, with the crimping torque controlled at 5-8 N·m. If there are any small gaps on the contact surface, a 0.1-0.2mm thick layer of conductive adhesive should be evenly applied to fill them, further reducing contact resistance and ensuring the conductivity and stability of the connection. Following the same procedure, the front-end amplifier of the second equipment subsystem 190 is connected to the second grounding grid lead-out point 120 through another equipment grounding wire 130 of the same specification. After connection, a multimeter is used to test the continuity and contact resistance of the two connections. The contact resistance is required to be ≤0.1Ω to eliminate problems such as loose connections and looseness, thus laying a reliable conductive foundation for the formation of the subsequent ground loop 150.

[0047] Next, an interconnection loop between the upper-level cabinet and the front-end amplifier is constructed using coaxial cable 300 to simulate the signal transmission scenario in actual operation. The inner conductor 302 of the coaxial cable 300 is used to transmit weak signals between the upper-level cabinet and the front-end amplifier, while the shielding layer 301 is used to isolate external electromagnetic radiation interference and ensure the purity of signal transmission. In this embodiment, the coaxial cable 300, which is adapted to the first equipment subsystem 180 (upper-level cabinet) and the second equipment subsystem 190 (front-end amplifier), has an effective signal transmission frequency range covering DC to 5MHz, which can meet the bandwidth requirements of weak signal transmission in particle accelerators. At the same time, to ensure the quality of weak signal transmission, the electromagnetic noise level of this interconnection loop must be controlled within a limit of no more than 10mV, and the shielding layer 301 of the coaxial cable 300 must maintain a reliable connection with the shielding grounding terminals of the cabinet and amplifier to achieve effective isolation from external electromagnetic noise. During connection, ensure that the inner conductor 302 of the coaxial cable 300 is accurately inserted into the signal output port of the upper-level cabinet and the signal input port of the front-end amplifier. Tighten the interface with the matching nuts to prevent signal attenuation or distortion due to poor contact. Simultaneously, the shielding layer 301 of the coaxial cable 300 must be reliably connected to the shielding grounding terminals of both the upper-level cabinet and the front-end amplifier, forming a complete shielding protection loop. At this point, the process grounding grid 100, the two equipment grounding wires 130, the coaxial cable 300, the first grounding grid lead-out point 110, and the second grounding grid lead-out point 120 together constitute a closed ground loop 150, completely replicating the ground loop structure in the system design and providing a realistic operating environment for subsequent testing.

[0048] Subsequently, an excitation signal of a specified frequency is injected into the ground loop. This step needs to match the system's testing requirements for covering key frequency bands. The frequency range of the excitation signal is set to 50Hz-150kHz using the impedance analyzer control module 230 with preset test parameters. This range accurately covers the critical intervals for signal transmission and electromagnetic coupling in the actual operation of the process grounding grid ground loop. The signal amplitude is adjusted according to the operating thresholds of the upstream cabinet and front-end amplifier, typically controlled between 0.1-5V. This avoids interference with normal equipment operation due to excessive amplitude, and also prevents measurement errors due to insufficient amplitude. Simultaneously, signal output stability parameters are set, with frequency drift ≤0.1%. After parameter confirmation, the impedance analyzer 210 transmits the excitation signal to the test fixture 220 via the connecting line 280. Then, through the test line 260 connecting the first grounding grid lead-out point 110 and the auxiliary test line 270 connecting the second grounding grid lead-out point 120, the excitation signal is finally injected into the ground loop 150 between the two lead-out points. During the injection process, the impedance analyzer control module 230 monitors the signal output status in real time to ensure that the signal frequency and amplitude do not drift, meeting the high-precision test requirements.

[0049] During the continuous injection of the excitation signal, precise measurements of the voltage across the ground loop and the loop current are performed simultaneously; this is a crucial step in obtaining impedance data. The impedance analyzer 210 completes two types of data acquisition through its built-in high-precision measurement module: for voltage measurement, the voltage between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 is directly acquired using test leads 260 and auxiliary test leads 270. The measurement accuracy reaches the millivolt level (≤±1mV), effectively capturing minute changes in ground loop potential difference; for current measurement, the current flowing in the ground loop 150 is monitored in real time through the built-in current sensing unit of the impedance analyzer 210. The measurement accuracy reaches the milliampere level (≤±1mA), avoiding errors caused by current signal attenuation. The acquired voltage... With current The data is transmitted to the impedance analyzer control module 230 in real time and simultaneously stored in the impedance analyzer storage medium 240 to ensure complete data retention and facilitate subsequent traceability and analysis.

[0050] Finally, the ground loop impedance at the specified frequency is calculated and obtained to form quantitative data that can be used for system evaluation.

[0051] According to one embodiment of the present invention, the method further includes: providing an excitation signal of a predetermined frequency required for testing; and measuring the voltage between the first grounding grid lead-out point and the second grounding grid lead-out point. and current ;calculate This serves as the grounding impedance between the first grounding grid lead-out point and the second grounding grid lead-out point at a specified frequency.

[0052] Specifically, providing the required excitation signal at the specified frequency for testing relies on the coordinated operation of the impedance analyzer 210 and the impedance analyzer control module 230, and must strictly match the actual operating frequency band requirements of the particle accelerator process grounding network 100 ground loop 150. The impedance analyzer control module 230 can preset the frequency parameters of the excitation signal, which is fixed at 50Hz-150kHz. This range accurately covers the key frequency bands for signal transmission and electromagnetic coupling between particle accelerator subsystems, ensuring that the test scenario is consistent with the actual operating state of the equipment. At the same time, the signal amplitude can be adjusted according to the operating thresholds of the upstream cabinet, front-end amplifier, and other equipment, usually controlling the amplitude between 0.1-5V. This avoids both excessive amplitude interfering with the normal operation of the equipment and excessive amplitude leading to a weak measurement signal and increased error. After the parameters are set, the impedance analyzer 210 generates a stable excitation signal. The signal is transmitted to the test fixture 220 via the connecting line 280, and then transmitted to the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 via the test line 260 and the auxiliary test line 270, respectively. Finally, it is injected into the ground loop 150 between the two lead-out points. The frequency drift is controlled within ≤0.1% during the entire signal transmission process to ensure the stability of the excitation signal and meet the test accuracy requirements.

[0053] The voltage between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 and current The measurement is carried out synchronously with the excitation signal injection process and is achieved using the high-precision measurement module built into the impedance analyzer 210. Voltage measurement. At the same time, utilizing the low impedance characteristics of test lead 260 and auxiliary test lead 270, the potential difference between the two grounding grid lead-out points is directly acquired, with a measurement accuracy of millivolt level (≤±1mV). This accurately captures subtle changes in the potential difference within the ground loop 150, avoiding measurement deviations caused by cable impedance or signal attenuation; measuring current... At the same time, the current flowing in the ground loop 150 is monitored in real time through the current sensing unit built into the impedance analyzer 210, with a measurement accuracy of milliampere level (≤±1mA), ensuring that the current data truly reflects the current transmission status of the ground loop. The collected voltage... With current The data is transmitted to the impedance analyzer control module 230 in real time and simultaneously stored in the impedance analyzer storage medium 240. This ensures that the data transmission process is free from loss and distortion, and also provides support for the traceability and review analysis of subsequent test data.

[0054] The calculation of the ground loop impedance is automatically performed by the impedance analyzer control module 230, based on the formula. Finish.

[0055] According to an embodiment of the present invention, calibrating the test system before providing an excitation signal of a specified frequency required for testing includes: disconnecting the test line 260 from the auxiliary test line 270 before terminating the test line 260 and the auxiliary test line 270 with the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120, respectively; recording the inherent impedance of the test fixture 220, the test line 260, and the auxiliary test line 270 using the zeroing function of the impedance analyzer 210; short-circuiting the test line 260 and the auxiliary test line 270 together; recording the inherent impedance of the test fixture 220, the test line 260, and the auxiliary test line 270 using the zeroing function of the impedance analyzer 210; and terminating the test line 260 and the auxiliary test line 270 with the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120, respectively.

[0056] Specifically, system calibration is a crucial preliminary operation to ensure test accuracy. Its purpose is to eliminate the interference of the inherent impedance of the test fixture 220, test lead 260, and auxiliary test lead 270 on the final measurement results, ensuring that the grounding impedance data truly reflects the actual characteristics of the process grounding network 100. Before the test lead 260 and auxiliary test lead 270 are terminated with the first grounding network lead-out point 110 and the second grounding network lead-out point 120, an open-circuit calibration is first performed: the free ends of the test lead 260 and auxiliary test lead 270 are completely disconnected to ensure that there is no conductive contact between them, while keeping the connection state of the test lead 260, auxiliary test lead 270, and test fixture 220 unchanged. Then, the zeroing function of the impedance analyzer 210 is activated. The instrument will automatically scan and record the internal impedance of the test fixture 220, the cable impedance of the test lead 260, and the cable impedance of the auxiliary test lead 270 in the current state, forming an inherent impedance data set in the open-circuit state. This data will be transmitted to the impedance analyzer control module 230 in real time and stored in the impedance analyzer storage medium 240.

[0057] After completing the open-circuit calibration, the short-circuit calibration is performed immediately: the free ends of test lead 260 and auxiliary test lead 270 are tightly connected, ensuring there is no looseness or oxide layer interference at the connection point, forming a low-impedance short-circuit loop. At this time, both are reliably connected to the test fixture 220. The zeroing function of the impedance analyzer 210 is then activated again. The instrument will record the combined inherent impedance of the test fixture 220, test lead 260, and auxiliary test lead 270 under short-circuit conditions, supplementing and improving the inherent impedance data system. This step verifies the accuracy of the open-circuit calibration data and captures the contact impedance that may occur when the cable is short-circuited, further enhancing the comprehensiveness of the calibration.

[0058] To further eliminate potential errors in single-sided calibration and ensure calibration consistency at both grounding lead-out points, after completing the open-circuit and short-circuit calibration at the first grounding grid lead-out point 110, the complete calibration process described above must be repeated at the second grounding grid lead-out point 120: First, disconnect the auxiliary test lead 270 and test lead 260 connecting to the second grounding grid lead-out point 120, keeping the connection status of the auxiliary test lead 270, test lead 260, and test fixture 220 unchanged. Use the zeroing function of the impedance analyzer 210 to record the test fixture 220. 20. The inherent impedance of test lead 260 and auxiliary test lead 270; then, the test lead 260 and auxiliary test lead 270 on this side are tightly short-circuited to ensure there is no looseness or oxide layer interference. The inherent impedance of test fixture 220, test lead 260 and auxiliary test lead 270 is recorded again using the zeroing function of impedance analyzer 210. By comparing and integrating the calibration data from both sides, the interference of the inherent impedance of the components on the measurement results is further eliminated, and the voltage between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 is improved. Current The accuracy of the measurement.

[0059] After short-circuit calibration, the formal termination operation between the test leads and the grounding grid leads can be performed: Following the preset termination specifications, connect the free end of test lead 260 to the first grounding grid lead 110, and the free end of auxiliary test lead 270 to the second grounding grid lead 120. During the connection process, ensure the contact surfaces are clean and free of impurities. Fill any small gaps with conductive adhesive before bolting to ensure stable and compliant termination impedance. At this point, the impedance analyzer control module 230 has stored complete inherent impedance data for both open and short circuit states. During subsequent testing, this data will be automatically retrieved, and the inherent impedance of the test accessories will be subtracted from the measured total impedance, effectively eliminating system interference and ensuring voltage stability between the first grounding grid lead 110 and the second grounding grid lead 120. Current The accuracy of measurements and the final calculation of the ground loop impedance of 170Ω is ensured. The entire calibration process is closely integrated with subsequent testing operations, providing a solid foundation for high-precision ground impedance testing.

[0060] According to an embodiment of the present invention, the method further includes: setting the signal frequency range of the impedance analyzer 210 before testing; independently performing a preset number of measurements on the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120; confirming that the impedance value jump at a specific frequency point does not occur in the measurement data of the preset number of measurements, and verifying the validity of the measurement data; and checking the line after determining that the impedance value jump at a specific frequency point occurs in the measurement data of the preset number of measurements.

[0061] Specifically, the purpose of this step is to eliminate accidental interference and line anomalies during the testing process through pre-configuration of parameters and verification of data validity, ensuring the reliability of the final grounding impedance data and providing an accurate basis for the evaluation of the process grounding system. Before the formal test starts, the signal frequency range is first set: through the operation of the impedance analyzer control module 230, the signal frequency range of the impedance analyzer 210 is fixed at 50Hz-150kHz. This range accurately matches the key interval of signal transmission and electromagnetic coupling in the actual operation of the particle accelerator process grounding network 100 ground loop 150, and can comprehensively capture the grounding impedance characteristics at different frequencies. After the parameter settings are completed, they will be automatically stored in the impedance analyzer 210, providing a basis for the subsequent generation of excitation signals.

[0062] After setting the frequency parameters, independent measurements are performed on the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 for a preset number of times. The preset number of measurements is usually set to 5 times, which avoids the random errors of a single measurement while also ensuring testing efficiency. An independent operation mode is used during measurement, that is, an excitation signal is injected into the first grounding grid lead-out point 110 and data is collected separately. After completion, the same process is performed on the second grounding grid lead-out point 120 to avoid signal coupling interference between the two lead-out points and ensure the independence and purity of the data from each measurement. The impedance data from each measurement is transmitted in real time to the impedance analyzer control module 230 and stored in the impedance analyzer storage medium 240 along with the corresponding frequency point, forming a complete set of multiple measurement datasets.

[0063] After data acquisition, the validity assessment stage begins. Specific frequency points refer specifically to the main frequency bands for signal transmission during particle accelerator operation, such as the critical frequency band around 2.48kHz in a weak signal measurement system. The impedance characteristics of these frequency bands significantly affect the operational stability of the equipment. The assessment criteria are as follows: if, in the preset number of measurement data points, the impedance value fluctuation amplitude at all specific frequency points does not exceed ±5%, and there are no sudden increases or decreases, it indicates that the line connection is stable, there is no transient electromagnetic interference, and the measurement data can accurately reflect the actual state of the grounding grid, thus confirming the data's validity. If any specific frequency point experiences an impedance value jump exceeding the reasonable fluctuation range, it indicates a possible abnormality in the test line, requiring immediate suspension of testing and line verification.

[0064] The line verification should be carried out one by one, focusing on the key parts that may affect signal transmission and measurement: First, check the termination status of test lead 260 and the first grounding grid lead-out point 110, and auxiliary test lead 270 and the second grounding grid lead-out point 120, checking whether the conductive adhesive has fallen off, whether the bolts are loose, and whether there is an oxide layer or impurities on the contact surface that may cause unstable contact resistance; Second, check the interface connection between connecting line 280 and impedance analyzer 210 and test fixture 220, confirming that there are no looseness or poor contact issues; Then, check the laying status of auxiliary test lead 270, checking whether the insulator 250 is firmly fixed, and whether the auxiliary test lead 270 has accidentally come into contact with the process grounding grid 100 or surrounding metal structures to form an additional loop; Finally, check the internal connection of test fixture 220 to ensure that no parts are loose or damaged. After all verification items are completed and faults are eliminated, the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 should be independently measured a preset number of times until the measurement data is confirmed to be valid before proceeding to the formal testing process.

[0065] According to an embodiment of the present invention, the method further includes plotting the impedance frequency curve of the ground loop before the test ends. Specifically, this includes: reading multiple sets of measurement data from the impedance analyzer 210, wherein the measurement data consists of data pairs consisting of a specified frequency and the corresponding ground loop impedance value; mapping the multiple sets of measurement data one by one in a coordinate system where the horizontal axis is the signal frequency and the vertical axis is the ground loop impedance value, and plotting the impedance frequency curve of the ground loop impedance 170.

[0066] Specifically, plotting the impedance-frequency curve of the ground loop is a crucial final step in the testing process. Its purpose is to transform the scattered frequency-impedance data into an intuitive, visual curve, providing a clear basis for the characteristic analysis and quality assessment of the process grounding system. First, a data reading operation is performed. The impedance analyzer control module 230, through a stable connection with the impedance analyzer storage medium 240, retrieves all valid measurement data stored during the testing process in batches. This data is precise after pre-calibration and deduction of the inherent impedance of the test fixture 220, test leads 260, and auxiliary test leads 270. Each set of data consists of a "specified frequency" and the corresponding "ground loop impedance value," covering the entire test range of 50Hz-150kHz. The impedance value is calculated using the formula... The calculations ensured the correlation and accuracy of each data pair, and all data had passed the previous validity verification, with no impedance jump issues at specific frequencies.

[0067] Subsequently, a standard two-dimensional coordinate system was constructed. In accordance with the general specifications for impedance frequency characteristic analysis, the horizontal axis was set as the signal frequency, with the unit being Hertz (Hz). The frequency scale can be selected as linear or logarithmic distribution according to the characteristics of the test range to ensure that key frequency points in the main frequency band of weak signal transmission in the 50Hz-150kHz frequency band, such as particle accelerators, can be clearly presented. The vertical axis is the grounding impedance value of the ground loop, with the unit being ohms (Ω). The scale range is flexibly adjusted according to the actual measured impedance value range to ensure that all data points can be displayed completely, while highlighting the subtle changes in impedance values ​​and avoiding the indistinct trend of change due to an excessively large scale range.

[0068] Once the data and coordinate system are ready, the curve plotting process begins. The impedance analyzer control module 230 incorporates a professional plotting algorithm that maps multiple sets of frequency-impedance data pairs one by one into the coordinate system. Each data pair corresponds to a feature point in the coordinate system, ensuring a precise correspondence between frequency and impedance values. Subsequently, the algorithm connects all feature points sequentially in ascending frequency order using a smooth curve fitting method, forming a continuous and regular ground loop grounding impedance-frequency curve. During the fitting process, it automatically avoids any minor data fluctuations while preserving the trend of impedance value changes with frequency.

[0069] The completed impedance-frequency curves visually represent the variation of the grounding impedance of the internal loop within the 50Hz-150kHz frequency band. For example, they show which frequency points have high impedance values, which have low impedance values, and the rate of impedance increase or decrease with frequency. This visualization not only helps technicians quickly assess the grounding performance of the process grounding network 100 but also provides crucial clues for locating electromagnetic interference sources. If the impedance value is abnormally high in a critical frequency band, it may indicate that the band is susceptible to electromagnetic interference. Simultaneously, the curves provide a quantitative reference for optimizing the anti-interference design of weak signal transmission circuits, helping technicians to adjust circuit parameters or grounding methods accordingly, further improving the operational stability and measurement accuracy of the particle accelerator interconnect subsystem.

[0070] Figure 6 This is a impedance frequency characteristic curve plotted in a specific embodiment of the present invention. For example... Figure 6 As shown, the curve, with signal frequency as the horizontal axis (unit: Hz) and ground loop impedance value as the vertical axis (unit: Ω), fully presents the dynamic characteristics of the ground loop impedance 170 in the 50Hz-150kHz test frequency band as a function of frequency. Its data basis is multiple sets of accurate "frequency-impedance" data pairs after system calibration and validity verification. It truly reflects the grounding impedance characteristics between the first grounding grid lead-out point 110 and the second grounding grid lead-out point 120 of the process grounding grid 100 in the scenario where the upper-level cabinet (first equipment subsystem 180) and the front-end amplifier (second equipment subsystem 190) are interconnected through coaxial cable 300.

[0071] From the curve trend, in the low-frequency band (50Hz-2kHz), the grounding impedance 170 of the ground loop exhibits a relatively high value and fluctuates gently. Within this frequency band, the impedance is mainly affected by the soil current dissipation characteristics of the process grounding grid 100 and the resistance of the equipment grounding wire 130. The higher impedance value means that the signal reference consistency of the ground loop is weak during low-frequency signal transmission, which may cause slight interference to the measurement of weak signals related to the power frequency of the particle accelerator. Entering the mid-frequency band (2kHz-50kHz), the curve shows a clear downward trend and gradually stabilizes. Near 2.48kHz, the grounding impedance 170 of the ground loop is close to the impedance value of the shielding layer 301 of the coaxial cable 300. This characteristic highly matches the key frequency band for weak signal transmission in the embodiment. At this point, the inner conductor 302, the shielding layer 301, and the ground loop 150 easily form multiple transmission paths. Electromagnetic noise in the ground loop is easily coupled to the signal loop, becoming the main risk point for weak signal distortion. In the high-frequency band (50kHz-150kHz), the ground loop impedance 170 remains at a low level and has good stability, indicating that the process grounding network 100 has excellent grounding performance and strong signal reference grounding consistency in this frequency band, and can provide reliable grounding protection for high-frequency signal transmission of particle accelerators.

[0072] The plotting of this impedance characteristic curve provides an intuitive quantitative basis for evaluating the quality of the process grounding system. The curve allows for rapid assessment of the grounding performance across different frequency bands. For example, a high impedance value in the low-frequency band suggests that the grounding effect can be improved by optimizing the termination method of the equipment grounding wire 130 or increasing the number of grounding electrodes. It accurately identifies the key risk frequency bands for electromagnetic interference; the impedance matching phenomenon near 2.48kHz clarifies the sensitive range for weak signal transmission, providing a precise direction for subsequent electromagnetic interference source investigation. It provides data support for circuit design optimization. Given the stable impedance in the high-frequency band and the relatively high impedance in the low-frequency band, a low-frequency filter module can be added to the weak signal transmission circuit, or the grounding method of the coaxial cable 300 shielding layer can be adjusted to reduce the impact of ground loop noise. It verifies the effectiveness of the test method of this invention; the clear trend change of the curve is highly consistent with the theoretical analysis, proving that the test system can accurately capture the frequency characteristics of the ground loop impedance, providing solid technical support for the design, operation, and optimization of the particle accelerator process grounding system.

[0073] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a test method for a ground loop grounding impedance test system for particle accelerator process grounding systems provided by the methods described above.

[0074] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0075] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process ground system ground loop impedance test system, comprising: The system comprises: an impedance analyzer for providing an excitation signal of a specified frequency required for testing, the excitation signal of the specified frequency covering a frequency band of 50 Hz-150 kHz matching a key frequency band in actual operation of a particle accelerator process ground net loop, and measuring a voltage and a current between a first ground net extraction point and a second ground net extraction point set on a process ground net of a particle accelerator grounding system; a test fixture connected with the impedance analyzer through a connecting line, for connecting the first ground net extraction point and the second ground net extraction point to the impedance analyzer through a test line and an auxiliary test line respectively, and for the impedance analyzer to inject and measure the excitation signal; the test line and the auxiliary test line are low-impedance measurement signal lines, and the test line and the auxiliary test line are bolted and compressed by conductive glue at terminal points of the first ground net extraction point and the second ground net extraction point, with a contact resistance of ≤0.1Ω; an impedance analyzer control module connected with the impedance analyzer, for controlling test parameters and processes of the impedance analyzer, reading and processing measurement data of the impedance analyzer, obtaining a grounding impedance between the first ground net extraction point and the second ground net extraction point at the specified frequency, and generating a frequency-resistance curve; an insulator for laying and fastening the auxiliary test line.

2. The test system of claim 1, wherein, The system comprises: an impedance analyzer storage medium for storing data obtained by the impedance analyzer in testing.

3. The test system of claim 2, wherein, The test data of the impedance analyzer is stored in the impedance analyzer storage medium; the impedance analyzer control module is connected with the impedance analyzer storage medium, and reads the test data in the impedance analyzer storage medium.

4. The test system of claim 1, wherein, The test line and the auxiliary test line are low-impedance measurement signal lines; terminal points between the test line and the first ground net extraction point and between the auxiliary test line and the second ground net extraction point are bolted and compressed by conductive glue.

5. A method of testing a loop ground impedance test system of a process grounding system according to any one of claims 1-4, characterized in that, The system comprises: connecting a first device subsystem and a second device subsystem to the first ground net extraction point and the second ground net extraction point respectively through device grounding lines; connecting the first device subsystem and the second device subsystem through an interconnection cable; injecting an excitation signal of a specified frequency between the first ground net extraction point and the second ground net extraction point; measuring a voltage between the first ground net extraction point and the second ground net extraction point; measuring a current flowing between the first ground net extraction point and the second ground net extraction point; obtaining a grounding impedance between the first ground net extraction point and the second ground net extraction point of the particle accelerator process ground net at the specified frequency.

6. The test method of claim 5, wherein, The system further comprises: providing an excitation signal of a specified frequency required for testing; measuring a voltage U_sf and a current I_sf between the first ground net extraction point and the second ground net extraction point; calculating Z_sf as a grounding impedance between the first ground net extraction point and the second ground net extraction point at the specified frequency.

7. The test method of claim 6, wherein, Before providing the test required specified frequency excitation signal, the test system is calibrated, comprising: Before the test line and the auxiliary test line are respectively terminated with the first ground net lead-out point and the second ground net lead-out point, the test line and the auxiliary test line are disconnected, and the inherent impedance of the test fixture and the test line and the auxiliary test line is recorded by using the zeroing function of the impedance analyzer; The test line and the auxiliary test line are shorted together, and the inherent impedance of the test fixture and the test line and the auxiliary test line is recorded by using the zeroing function of the impedance analyzer; The test line and the auxiliary test line are respectively terminated with the first ground net lead-out point and the second ground net lead-out point.

8. The test method of claim 6, wherein, Further comprising: Before testing, set the signal frequency range of the impedance analyzer; Independently measure the first ground net lead-out point and the second ground net lead-out point for a preset number of times; Determine that no impedance value jump occurs at a specific frequency in the preset number of measurement data, and confirm that the measurement data is valid; Determine that impedance value jump occurs at a specific frequency in the preset number of measurement data, and check the line.

9. The test method of claim 6, wherein, Further comprising drawing the impedance-frequency curve of the ground loop grounding impedance before the test ends, specifically comprising: Reading a plurality of sets of measurement data of the impedance analyzer, wherein the measurement data is a data pair composed of a specified frequency and a corresponding ground loop grounding impedance value; In a coordinate system with signal frequency as the horizontal coordinate and ground loop grounding impedance value as the vertical coordinate, the plurality of sets of measurement data are one-to-one mapped to draw the impedance-frequency curve of the ground loop grounding impedance. 10.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize all or part of the steps of the ground loop grounding impedance test method of the particle accelerator process grounding system according to any one of claims 5 to 9.

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