Distribution pattern of electrical field in the node under investigation (Fig. 2) was obtained for analytical
calculation in software package Elcut 5.5 (corresponding region is denoted in Fig. 1 by rectangular frame).
Herewith axially-symmetrical problem of electrostatics was solved. Field distribution is denoted by
equipotential lines, intensity distribution is denoted by arrows. Elements designations are given in accordance
with Fig. 1. Contours (a-b) and (c-d-e-f) indicate possible directions of discharge formation.
Axially-symmetrical problem setting slightly impairs calculation accuracy (in comparison with three dimensional
model), but it allows to carry out an estimative analysis. The most probable directions of
discharge formation, subject to calculation, are given in Fig. 2. Basic parameters of gaps, under investigation,
are given in Table 1. Two main gaps types can be distinguished in construction under investigation: purely
gas-insulated gap (a-b, c-d, e-f) and a gap along insulator surface (d-e).
Distribution pattern of electrical field in the node under investigation (Fig. 2) was obtained for analytical
calculation in software package Elcut 5.5 (corresponding region is denoted in Fig. 1 by rectangular frame).
Herewith axially-symmetrical problem of electrostatics was solved. Field distribution is denoted by
equipotential lines, intensity distribution is denoted by arrows. Elements designations are given in accordance
with Fig. 1. Contours (a-b) and (c-d-e-f) indicate possible directions of discharge formation.
Axially-symmetrical problem setting slightly impairs calculation accuracy (in comparison with three dimensional
model), but it allows to carry out an estimative analysis. The most probable directions of
discharge formation, subject to calculation, are given in Fig. 2. Basic parameters of gaps, under investigation,
are given in Table 1. Two main gaps types can be distinguished in construction under investigation: purely
gas-insulated gap (a-b, c-d, e-f) and a gap along insulator surface (d-e).
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