AC mitigation in a shared power corridor

Induced voltage modelled on 14 km of pipeline beside a 240 kV line, then brought under the 15 V touch limit.

14 kmCorridor modelled

< 15 VTouch voltage after mitigation

6Decouplers installed

0Lost-time incidents

The problem

A 14 km pipeline runs beside a 240 kV transmission line.

Field readings showed induced AC above the safe touch limit at two valve sites, and the operator needed a plan before a scheduled dig.

01

Model
Induced voltage modelled for normal and fault conditions along the corridor.
02

Design
Zinc ribbon and six DC decouplers specified at the worst-case locations.
03

Install
Ribbon laid in the existing trench; decouplers set at the valve sites.
04

Verify
Touch and step voltages re-measured under load.

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