Influence of Ground Wire Shunting on Tower Grounding Resistance Measurement

doi:10.3969/j.issn.1000-7229.2016.04.011

Abstract

Abstract:

When using the method of current-voltage three-electrode method to measure the power frequency grounding resistance of overhead line tower, the ground wire has a role in separating the measuring current into the tower grounding grid, which can affect the measurement accuracy of grounding resistance. This paper establishes a shunting model of measuring current into the tower grounding grid for overhead ground wire, and analyzes the degree of the ground wire shunting, the factors affecting the shunting effect and its influence law. The results show that：（1）the share of the ground wire shunting can reach more than 60%； the effect of shunting is more obvious when the grounding resistance of the measurement tower is greater, the grounding resistance of the non-measurement tower is smaller and the measurement tower is the first two tower from the substation；（2）only considering the effect of shunt size on grounding resistance measurement is not enough, ignoring the phase angle difference between the ground wire shunting and the measuring current can also cause big errors, which will make the measuring value of the grounding resistance higher.

Key words: tower, grounding resistance, overhead ground wire, shunt, phase angle difference

CLC Number:

TM 754

ZHANG Bocheng，HU Zhijian，ZHANG Kaijun. Influence of Ground Wire Shunting on Tower Grounding Resistance Measurement[J]. Electric Power Construction, 2016, 37(4): 70-75.

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