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Over the last 5 years or so, a number of micro-shock incidents have occurred under 220 kV and 110 kV transmission lines in New Zealand. Each micro-shock incident had differing circumstances. Investigation into these micro-shock incidents showed these were all caused by capacitive coupling (also known as electrostatic induction), from the nearby high-voltage lines. In some instances, modelling, using specialist software, CDEGS, was conducted to calculate the capacitive coupling issues. The initial aim of this modelling was to model the various scenarios experienced, and to ensure future micro-shock incidents are minimised as far as practically possible. Examples of the micro-shock incidents include:
In this paper: