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Keywords

high voltage transmission; power transmission and distribution corridor; induced voltage; maintenancework; grounding protection

Abstract

The extra-high voltage and ultra-high voltage transmission lines pose significant induced voltage hazards to the adjacent distribution lines beneath them, creating difficulties for distribution maintenance work.Installing grounding wires on the lines is one of the most effective protective measures against induced voltage, but there is a lack of experimental simulations and quantitative guidance that can support practical engineering.Based on the principle of induced voltage, experiments are designed to verify the effectiveness and distance limitation of induced voltage grounding protection during distribution maintenance.The influence of voltage level, number of circuits, and grounding interval distance on induced voltage is explored, and a simplified calculation formula for induced voltage under distribution line single-side grounding conditions is derived；the safe grounding interval distance under various typical operating conditions is calculated, and the selection of protective equipment is refined after the distribution line is grounded.The results show that the measured induced voltage of the ungrounded conductor under the 220 kV double-circuit line is approximately 963.7 V, and it decreases by 99.69% after grounding, showing a significant effect.The grounding protection for distribution lines has a distance limitation, and the induced voltage increases as the line voltage level, number of circuits, and grounding interval distance increase.After grounding the distribution line under various operating conditions, the induced voltage is reduced by 92.77%~97.71%.The safe grounding interval distance for the distribution line under the ultra-high voltage line is only 0.094 km, and there are five risk levels, for which different protective equipment must be adopted to address.The results obtained can provide a reference for the safety work in distribution line maintenance.

DOI

10.19781/j.issn.1673-9140.2025.05.028

First Page

297

Last Page

305

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