Since the existing electric power standards have not provided the safe production and operation distance for the ±200 kV convertor station, based on the relative position of the charged equipment and grounded equipment in the DC field, 6 kinds of possible discharge gaps are summarized, such as tube bus wall gap, tube bus worker gap, divided bus-worker gap, divided bus-wall gap, smoothing reactor-fence, and divided bus-fence gap. To make the production and operation of the 200 kV Convertor Station to go smoothly and avoid discharge between the charged equipment and grounded equipment or worker in the DC field, 1:1 models of the equipment are made, and positive 250/2 500 μs switching impulse voltage is applied to carry out discharge tests to get the switching impulse discharge curves of the gaps. Meanwhile, based on the correlative regulations of hot-line work, the safe distances are calculated under the different safety margin of 10%, 20%, 30%, besides, the hazard rates of safe distances are verified. The minimum safe distance of each gap is given: the tube bus-ground gap is 2.95 m, tube bus-wall gap is 1.44 m, divided bus-ground gap is 3.12 m, divided bus-wall gap is 1.4 m, and the smoothing reactor-fence gap is 1.17 m.
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