Analysis of Induced Voltage of a Single-Point Grounded OPGW in 35 kV Distribution Lines

The optical fiber composite overhead ground wire (OPGW) has been widely used in power transmission lines. It can not only serve as an overhead ground wire for lightning protection but also be used for information communication for power system as well as achieving functions such as online monitoring. There are two common grounding methods for OPGW: all-tower grounding and single-point grounding. Adopting a single-point grounding method can effectively reduce induction current and energy loss by 50 Hz power transmission, but may generate a larger induction voltage. This paper studied the induced voltage of insulated OPGW by single-point grounding on 35 kV single-circuit distribution lines. The conditions of segmented insulation and mid-point grounding are adopted for numerical simulation, and the influence of tower height and wire displacement on induction voltage was discussed. The results showed that tower height and wire displacement have almost no effect on the induced voltage.