On-line measurement device and measurement method of grounding resistor

Abstract

The invention discloses an on-line measurement device and measurement method of a grounding resistor. The on-line measurement device comprises an on-site measurement device and a background algorithm processing center. The on-site measurement device comprises a power supply module, a variable-frequency power supply module, a weak signal conditioning module, a data acquisition module, a main control chip, a man-machine interaction module and a ground loop; the variable-frequency power supply module, the data acquisition module, the power supply module and the man-machine interaction module are connected with the main control chip; and the variable-frequency power supply module and the weak signal conditioning module are connected with the data acquisition module. The ground loop comprises a voltage jaw and a current jaw. The background algorithm processing center adopts a hybrid genetic algorithm to perform data processing, and then a grounding resistance value of a measured electrode is obtained. After the structure and the method are adopted, on-line real-time detection can be achieved, and a grounding lead does not need to be disconnected; and a grounding equation set is constructed through the grounding resistance value obtained through measurement, and a calculation of the grounding resistance value is achieved through an application of the hybrid genetic algorithm, so a measurement error is reduced, and the measurement is convenient and accurate.

Description

technical field [0001] The invention relates to the technical field of building grounding resistance measurement, in particular to an online measuring device and method for grounding resistance. Background technique [0002] The measurement of grounding resistance is an important factor to measure whether the grounding system meets the regulations, and it is also an important content of the current lightning protection safety inspection. The double-clamp method is more and more favored by scientific and technological workers in the detection because it does not need to set up auxiliary ground electrodes, and does not need to disconnect the ground down-conductor during the measurement process, and can realize the advantages of online measurement. [0003] When the traditional double-clamp method is used to measure the grounding resistance value, the influence of the loop resistance on the grounding resistance of the measured grounding electrode is ignored, and the measured va...

AI Technical Summary

Problems solved by technology

[0003] When the traditional double-clamp method is used to measure the grounding resistance value, the influence of the loop resistance on the grounding resistance of the measured grounding electrode is ignored, and the measured value is directly approximated.

However, the double-clamp method measurement loop includes multiple branches, and there is obviously a measurement method error between the measured loop resistance and the ground electrode resistance.

And when the branch circuit has poor contact due to reasons such as ground electrode corrosion and open circuit, it will have a negative impact on the resistance value of the entire circuit, making the measurement results inaccurate and with large errors

Since the entire measurement circuit is related to multiple resistance values, it is impossible to directly determine the location of the over-standard resistance value, which has great limitations.

Images