CN-121978412-A - Three-point method ground resistance intelligent test method and system based on electric explosion-proof environment

CN121978412ACN 121978412 ACN121978412 ACN 121978412ACN-121978412-A

Abstract

The invention discloses an intelligent three-point method grounding resistor testing method and system based on an electric explosion-proof environment, and relates to the technical field of intelligent resistor testing. The method comprises the steps of collecting electrical environment characteristic data of an electrical explosion-proof environment, adjusting resistance intelligent test parameters according to the electrical environment characteristic data, obtaining adjusted resistance intelligent test parameters, executing ground resistance intelligent test according to the adjusted resistance intelligent test parameters, monitoring measurement characteristic data of the ground resistance intelligent test in the ground resistance intelligent test process, analyzing measurement stability information of the ground resistance intelligent test according to the measurement characteristic data of the ground resistance intelligent test, executing ground resistance intelligent test condition verification optimization according to the measurement stability information of the ground resistance intelligent test, obtaining test results of the ground resistance intelligent test, and improving accuracy and reliability of the ground resistance intelligent test.

Inventors

GAO JIAN
WANG SHUAI
WANG ZONGNING
TANG JIE
TIAN RAN
HUANG KAIMING
WANG HAODONG
DENG JIN
WANG LUFEI
LIU HAONAN

Assignees

江苏省安全生产科学研究院

Dates

Publication Date: 20260505
Application Date: 20260318

Claims (10)

1. The intelligent three-point method ground resistance testing method based on the electric explosion-proof environment is characterized by comprising the following steps of: Acquiring electrical environment characteristic data of an electrical explosion-proof environment, and adjusting resistance intelligent test parameters according to the electrical environment characteristic data to obtain adjusted resistance intelligent test parameters; according to the adjusted intelligent resistance test parameters, performing an intelligent ground resistance test, and monitoring measurement characteristic data of the intelligent ground resistance test in the intelligent ground resistance test process; Analyzing and obtaining measurement stability information of the intelligent ground resistance test according to measurement characteristic data of the intelligent ground resistance test; and executing the verification optimization of the intelligent test condition of the ground resistance according to the measurement stability information of the intelligent test of the ground resistance to obtain the test result of the intelligent test of the ground resistance.
2. The intelligent three-point method ground resistance testing method based on the electrical explosion-proof environment according to claim 1, wherein the method for adjusting intelligent resistance testing parameters according to the electrical environment characteristic data is as follows: the electrical environment characteristic data of the electrical explosion-proof environment comprise soil resistivity, grounding body resistance, environment average temperature and environment average humidity of the electrical explosion-proof environment; the intelligent resistance test parameters comprise an output current value and a filtering bandwidth; comprehensively analyzing the grounding body resistance, the environment average temperature and the environment average humidity of the electric explosion-proof environment to obtain an environment interference evaluation value of the electric explosion-proof environment, wherein the environment interference evaluation value of the electric explosion-proof environment represents a quantification result of the influence degree of the grounding body resistance, the environment average temperature and the environment average humidity on the stability of a grounding resistance measurement signal; According to the soil resistivity of the electric explosion-proof environment and a preset soil resistivity threshold, adjusting an output current value to obtain an adjusted output current value; and adjusting the filter bandwidth according to the environmental interference evaluation value of the electric explosion-proof environment and a preset environmental interference evaluation threshold value to obtain the adjusted filter bandwidth.
3. The intelligent three-point method ground resistance testing method based on the electric explosion-proof environment according to claim 1, wherein the method for analyzing the measurement stability information of the intelligent ground resistance test is as follows: the measurement characteristic data of the intelligent ground resistance test comprise a contact resistance value, an actual loop current value, a voltage response signal amplitude value and a voltage response signal noise level value of the intelligent ground resistance test; the measurement stability information of the intelligent ground resistance test comprises abnormal contact, abnormal current, abnormal voltage response signal, abnormal noise interference, normal contact, normal current, normal voltage response signal and normal noise interference; Comparing the contact resistance value with a preset contact resistance threshold, if the contact resistance value is higher than the preset contact resistance threshold, marking the measurement stability information of the intelligent test of the grounding resistance as abnormal contact, otherwise marking the measurement stability information of the intelligent test of the grounding resistance as normal contact; Recording the absolute value of the difference between the actual loop current value and the adjusted output current value as the absolute value of the current deviation of the intelligent ground resistance test, comparing the absolute value of the current deviation of the intelligent ground resistance test with a preset current deviation absolute value threshold, marking the measurement stability information of the intelligent ground resistance test as abnormal current if the absolute value of the current deviation is higher than the preset current deviation absolute value threshold, otherwise marking the measurement stability information of the intelligent ground resistance test as normal current; Comparing the amplitude value of the voltage response signal with a preset amplitude threshold value of the voltage response signal, if the amplitude value of the voltage response signal is lower than the preset amplitude threshold value of the voltage response signal, marking the measurement stability information of the intelligent test of the ground resistance as abnormal voltage response signal, otherwise marking the measurement stability information of the intelligent test of the ground resistance as normal voltage response signal; Comparing the voltage response signal noise level value with a preset voltage response signal noise level threshold, if the voltage response signal noise level value is higher than the preset voltage response signal noise level threshold, marking the measurement stability information of the intelligent test of the ground resistance as abnormal noise interference, otherwise marking the measurement stability information of the intelligent test of the ground resistance as normal noise interference.
4. The intelligent three-point method ground resistance testing method based on the electrical explosion-proof environment according to claim 3, wherein the method for executing the intelligent ground resistance testing condition verification optimization is as follows: If the measurement stability information of the intelligent ground resistance test is normal in contact, normal in current, normal in voltage response signal and normal in noise interference, a multipoint verification mechanism of the intelligent ground resistance test by a three-point method is executed; If the measurement stability information of the intelligent ground resistance test is abnormal contact, executing a first optimization flow of the intelligent ground resistance test; If the measurement stability information of the intelligent ground resistance test is abnormal current, executing a second optimization flow of the intelligent ground resistance test; If the measurement stability information of the intelligent ground resistance test is abnormal in the voltage response signal, executing a third optimization flow of the intelligent ground resistance test; And if the measurement stability information of the intelligent ground resistance test is abnormal in noise interference, executing a fourth optimization flow of the intelligent ground resistance test.
5. The intelligent testing method for the three-point grounding resistor based on the electric explosion-proof environment according to claim 4, wherein the method for executing the multi-point verification mechanism of the intelligent testing for the three-point grounding resistor is as follows: The potential probe for controlling the intelligent test of the grounding resistance is respectively moved to a first preset proportionality coefficient, a second preset proportionality coefficient and a third preset proportionality coefficient of the distance between the detected grounding electrode and the current auxiliary electrode, and grounding resistance measurement is carried out once at each position to obtain three original resistance measurement values corresponding to different measurement positions; And if the absolute values of the differences among the three original resistance measured values are within a preset tolerance range, determining the average value of the three original resistance measured values as a test result of the final intelligent ground resistance test, otherwise, generating measurement data inconsistency early warning information, and displaying the measurement data inconsistency early warning information through a user interface or sending the measurement data inconsistency early warning information to a mobile terminal of a worker through a communication interface.
6. The intelligent three-point method ground resistance testing method based on the electrical explosion-proof environment according to claim 4, wherein the method for executing the first optimization flow of the intelligent ground resistance testing is as follows: Adding the adjusted output current value and a preset output current increment value to obtain a candidate output current value, determining the candidate output current value as an output current target value if the candidate output current value is smaller than or equal to a preset intrinsic safety maximum output current limit value, determining the intrinsic safety maximum output current limit value as an output current target value if the candidate output current value is larger than the preset intrinsic safety maximum output current limit value, and re-executing the intelligent grounding resistance test according to the output current target value.
7. The intelligent three-point method ground resistance testing method based on the electrical explosion-proof environment according to claim 4, wherein the method for executing the second optimization flow of the intelligent ground resistance testing is as follows: And adding the adjusted filter bandwidth with a preset filter bandwidth increment value to obtain a filter bandwidth target value, and re-executing the intelligent test of the grounding resistance according to the filter bandwidth target value.
8. The intelligent three-point method ground resistance testing method based on the electrical explosion-proof environment according to claim 4, wherein the method for executing the third optimization flow of the intelligent ground resistance testing is as follows: And adding the voltage output amplitude value with a preset voltage output amplitude value to obtain a voltage output amplitude target value, and re-executing the intelligent test of the grounding resistor according to the voltage output amplitude target value.
9. The intelligent three-point method ground resistance testing method based on the electrical explosion-proof environment according to claim 4, wherein the method for executing the fourth optimization flow of the intelligent ground resistance testing is as follows: And adding the measurement frequency with a preset measurement frequency increment value to obtain a measurement frequency target value, and re-executing the intelligent test of the ground resistance according to the measurement frequency target value.
10. Three-point method ground resistance intelligent test system based on electric explosion-proof environment, its characterized in that includes: The test parameter adjustment module is used for acquiring electrical environment characteristic data of the electrical explosion-proof environment, adjusting the intelligent resistance test parameters according to the electrical environment characteristic data, and obtaining the adjusted intelligent resistance test parameters; the resistor testing module is used for executing the intelligent test of the grounding resistor according to the adjusted intelligent resistor testing parameters, and monitoring the measurement characteristic data of the intelligent test of the grounding resistor in the intelligent test process of the grounding resistor; the stability information analysis module is used for analyzing and obtaining measurement stability information of the intelligent ground resistance test according to measurement characteristic data of the intelligent ground resistance test; and the verification optimization module is used for executing verification optimization of the intelligent ground resistance test conditions according to the measurement stability information of the intelligent ground resistance test to obtain the test result of the intelligent ground resistance test.

Description

Three-point method ground resistance intelligent test method and system based on electric explosion-proof environment Technical Field The invention relates to the technical field of intelligent resistance testing, in particular to an intelligent three-point method grounding resistance testing method and system based on an electric explosion-proof environment. Background In an electrical explosion-proof environment, the ground resistance test is critical to ensuring the safety of equipment and personnel, and is usually measured by a three-point method. However, the explosion-proof area requires the use of intrinsically safe equipment whose output voltage, current and energy are severely limited to prevent sparks or overheating. How to accurately measure the grounding resistance and overcome the influence of the environment on the signal quality under the condition of safety energy limit is a core task for designing an intelligent test system. In an explosion-proof environment, the strength of the ground resistance test signal may be reduced due to high soil resistivity, poor auxiliary electrode contact, or limited wiring conditions. Due to the limitations of intrinsically safe devices, the test instruments do not provide a sufficient current output, which makes the test signal too weak to ensure a stable voltage measurement. In this case, some intelligent testers may process by means of filtering, increasing the average number, or prolonging the integration time, so that the measurement result appears stable, in order to give a stable reading, but in practice this stability does not represent the physical reality of the measurement. The method of the algorithm compensation treatment can mask the real grounding problem, especially when the test condition is poor or the grounding body is not in accordance with the specification, the instrument can still output an incorrect grounding resistance value, so that the misleading of the test result is caused, and the grounding system on site can be misjudged as qualified, thereby bringing risks to equipotential connection and fault current discharge of the explosion-proof device. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a three-point method ground resistance intelligent test method and system based on an electric explosion-proof environment, which can effectively solve the problems related to the background art. The intelligent three-point method ground resistance testing method based on the electric explosion-proof environment comprises the steps of collecting electric environment characteristic data of the electric explosion-proof environment, adjusting intelligent resistance testing parameters according to the electric environment characteristic data, and obtaining the adjusted intelligent resistance testing parameters. And executing the intelligent ground resistance test according to the adjusted intelligent resistance test parameters, and monitoring measurement characteristic data of the intelligent ground resistance test in the intelligent ground resistance test process. And analyzing and obtaining measurement stability information of the intelligent ground resistance test according to measurement characteristic data of the intelligent ground resistance test. And executing the verification optimization of the intelligent test condition of the ground resistance according to the measurement stability information of the intelligent test of the ground resistance to obtain the test result of the intelligent test of the ground resistance. Further, the method for adjusting the intelligent resistance test parameters according to the electrical environment characteristic data comprises the steps that the electrical environment characteristic data of the electrical explosion-proof environment comprise the soil resistivity, the grounding body resistance, the environment average temperature and the environment average humidity of the electrical explosion-proof environment. The intelligent resistance test parameters comprise an output current value and a filter bandwidth. And comprehensively analyzing the grounding body resistance, the environment average temperature and the environment average humidity of the electric explosion-proof environment to obtain an environment interference evaluation value of the electric explosion-proof environment, wherein the environment interference evaluation value of the electric explosion-proof environment represents a quantification result of the influence degree of the grounding body resistance, the environment average temperature and the environment average humidity on the signal stability of the measurement signal of the grounding resistance. And adjusting the output current value according to the soil resistivity of the electric explosion-proof environment and a preset soil resistivity threshold value to obtain an adjusted output current value. And adjusting the filter bandwidth according