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Siemens 38-3AH3 38 kV Instruction Manual page 64

Vacuum circuit breaker
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Table 12: Type 38-3AH3 vacuum circuit breaker ratings (new "constant kA" ratings basis)
General
Rated
Rated
values
voltage
Insulation
levels
Rated
current
Related
Current
required
capabilities
Closing and
latching
(momentary)
64
Appendix
Measured parameter
Nominal voltage class
Maximum design voltage (V)
Voltage range factor (K)
Withstand
Power-frequency
voltage levels
Lightning-impulse (BIL)
Continuous
Short-circuit (at rated maximum design voltage)
(I)
Interrupting time
Permissible tripping delay (Y)
Rated maximum design voltage (V) divided by K =
(V/K)
Maximum symmetrical (sym) interrupting (K x I)
%dc component
Short-time current (K x I) (three-seconds)
Asymmetrical (1.55 x I)
Peak (2.6 x I)
These ratings are in accordance with:
ANSI/IEEE C37.04-1999 Standard Rating
Structure for AC High-Voltage Circuit
Breakers
ANSI/IEEE C37.06-2009 AC High-
Voltage Circuit Breakers Rated on a
Symmetrical Current Basis - Preferred
Ratings and Related Required
Capabilities
ANSI/IEEE C37.09-1999 Standard Test
Procedure for AC High-Voltage Circuit
Breakers Rated on a Symmetrical
Current Basis
ANSI/IEEE C37.010-1999 Application
Guide for AC High-Voltage Circuit
Breakers Rated on a Symmetrical
Current Basis.
2
3
4
5, 6
7
Footnotes:
"xxxx" in type designation refers to the
1
continuous current rating 1,200, 2,000 or
3,000 A, as appropriate. The 3,000 A fan-
cooled rating is achieved using fan cooling as
indicated in Footnote 4.
Maximum design voltage the circuit breaker is
2
designed for and the upper limit for operation.
K is listed for informational purposes only. For
3
circuit breakers rated on a "constant kA basis,"
the voltage range factor is 1.0.
4
3000FC indicates fan cooling is included in the
switchgear structure for this rating. 3000 A
rating is not available in outdoor equipment.
5
All values apply to polyphase and line-to-line
faults.
6
Standard duty cycle is O - 0.3s - CO - 3 min. -
CO.
7
Three-cycle (50 ms) interrupting is optionally
available.
Units
Circuit breaker type
38-3AH3-31
kV
38.0
kV rms
38.0
----
1.0
kV rms
80
kV peak
150
A rms
1,200, 2,000,
3,000FC
kA rms sym
31.5
Cycles/ms
5/83
Sec
2
kA rms
38.0
kA rms sym
31.5
%
47
kA rms sym
31.5
kA rms
49
kA peak
82
1
38-3AH3-40
38.0
38.0
1.0
80
150
1,200, 2,000,
3,000FC
40
5/83
2
38.0
40
47
40
62
104

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