Siemens 3AP2-FI, Operation & Maintenance Manual

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9
3 Description
3.1.3 Insulation Rating
Rated voltage 420 kV
Rated short-duration power-frequency
withstand voltage
to earth 520 kV
across the open circuit-breaker 610 kV
between phases 520 kV
Rated lightning impulse withstand
voltage
to earth 1425 kV
across the open circuit-breaker 1425 kV
between phases 1425 kV
Impulse against power frequency
voltage 1425 kV +240 kV
Rated switching impulse withstand
voltage
to earth 1050 kV
across the open circuit-breaker 1050 kV
between phases 1575 kV
Impulse against power frequency
voltage 900 kV + 345 kV
Flashover distance in air
to earth 3180 mm
across the open circuit-breaker 3200 mm
between phases
see dimension drawing
Minimum creepage distance over the
insulators' surfaces
to earth 10050 mm
across the open circuit-breaker 10500 mm
Table 1 Insulation rating
3.1.4 Electrical
Data
Rated voltage 420 kV
Rated frequency 50 Hz
Rated normal current 3150 A
Rated short-circuit breaking current 50 kA
Rated line-charging breaking current
(1.4 p.u.)
600 A
Rated cable-charging breaking
current (1.4 p.u.)
400 A
Transient recovery voltage under
terminal fault conditions
ace. to IEC
Rated short-circuit making current 135kA
Rated short-circuit duration 3s
Rated operating sequence O-0,3s-CO-3min-CO
Table 2
Electrical data