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7.4 Front panel of Bus-section unit
The
bus-section
unit
modules with following main elements:
1.
left module: one three -position disconnector (Ds)
and one circuit-breaker (E)
2.
right module: one three -position disconnector (Dd).
Both three-position disconnectors are mechanically
F i g u re 105: F ro n t p an el o f Bu s - secti o n u n i t.
consists
of
two
indiv isible
interlocked together and with the circuit-breaker in
order to prevent their operation when the circuit -
breaker is closed and to prevent the circuit-breaker
being operated when either selector is in use. Th e
selector and circuit-breaker status is indicated on the
front panel of the unit.
59
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