A system and method for testing the grounding resistance of transmission line poles and towers based on the two-pole method

Abstract

The invention discloses a system and method for testing the grounding resistance of transmission line towers based on the two-pole method. The system includes a tower to be tested, and the bottom of the tower to be tested includes a plurality of tower feet, and is characterized in that it also includes an auxiliary electrode F1 (8 ), the auxiliary electrode F2 (9) and the grounding resistance test device (7); the auxiliary electrode F1 (8) and the auxiliary electrode F2 (9) are respectively buried outside the tower grounding grid; during measurement, the auxiliary electrode F1 (8 ) and the auxiliary electrode F2 (9) are respectively connected to the two voltage feedback ports P1 and P2 of the grounding resistance testing device (7) through the grounding lead wire, and the grounding grid connection line of the tower foot to be tested is connected to the grounding resistance testing device (7) The current output of the E port. The invention is portable and free of wires, and is not limited by the scope of use, and solves the problem that the measurement results of the prior art are easily disturbed.

Description

technical field [0001] The invention relates to the field of high-voltage technology, in particular to a system and method for testing the grounding resistance of transmission line poles and towers based on the two-pole method. Background technique [0002] The grounding of transmission line poles and towers is very important to the safe and stable operation of the power system. Poor grounding of poles and towers will cause lightning accidents and cause line tripping. Grounding resistance measurement is a necessary means to check whether the grounding device meets the requirements of the regulations. Accurate measurement of grounding resistance can verify whether the design of the grounding system is reasonable, detect changes or defects in the grounding system in time, and avoid economic losses or accidents that may be caused by unqualified grounding. In order to ensure that the grounding resistance meets the design requirements, the "Operation Regulations for Overhead Pow...

AI Technical Summary

Problems solved by technology

This method requires auxiliary laying of current electrodes and voltage electrodes, and the layout position and self-resistance of the auxiliary electrodes have a great influence on the test results; some tower locations may not have the space for arranging auxiliary ground electrodes, resulting in the failure of the test; a large number of tests must be carried during the test Lines and related tools, low efficiency, inconvenient testing

The latter representative instrument is the clamp meter. The clamp meter method uses the nearby pole tower as the loop, and tests the loop resistance through the induced current. This method is convenient for testing and is used in some practical applications, but this method is less affected by the connection mode of the lightning conductor. Large, and weak anti-interference ability, the accuracy is low in practical applications

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