Method for measuring power frequency grounding resistance of iron pipe tower with double ground wires

Abstract

The invention discloses a method for measuring the power frequency grounding resistance of an iron pipe tower with double ground wires, which can greatly improve the test efficiency and the test accuracy, discover bad grounding in time and improve the lightning withstand level of equipment. The method comprises the following steps: (a) checking a ground electrode of the iron pipe tower, recording and timely processing abnormalities that a ground wire is damaged or a bolt is stolen and the like; (b) measuring the grounding resistance of the iron pipe tower using a clamp meter method under the condition that one ground wire is opened, checking whether ironware connecting bolts are loosed or in bad contact if the grounding resistance of the iron pipe tower is obviously increased relative to the grounding resistance of other surrounding tower and the conventional value of the iron pipe tower or exceeds the provision of the corresponding standard or regulation on the grounding resistance, re-measuring the grounding resistance after excluding, and executing step (c) if the grounding resistance is still increased or exceeds the standard; and (c) measuring the grounding resistance of the iron pipe tower using a three-pole method under the condition that the two ground wires are disconnected from tower metal.

Description

technical field [0001] The invention relates to a method for measuring the power frequency grounding resistance of an iron pipe tower with double lightning protection lines. Background technique [0002] At present, the grounding test of iron pipe towers generally adopts the three-pole method, which has a large workload and low efficiency. The test results are affected by many factors on site, and it is difficult to guarantee the accuracy and timeliness of the test in actual operation and maintenance. Although the test method of the clamp meter is simple, it is not suitable for the measurement of the grounding resistance of the iron pipe tower because the iron pipe tower itself does not have a separate grounding down conductor. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for measuring the power frequency grounding resistance of iron pipe towers with double lightning protection lines that can greatly ...

AI Technical Summary

Problems solved by technology

[0002] At present, the three-pole method is generally used in the grounding test of iron pipe towers, which has a large workload and low efficiency. The test results are affected by many factors on site, and it is difficult to guarantee the accuracy and timeliness of the test in actual operation and maintenance.

Although the test method of the clamp meter is simple, it is not suitable for the measurement of the grounding resistance of the iron pipe tower because the iron pipe tower itself does not have a separate grounding down conductor.

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