Technical data

These ratings are in accordance with the
following standards:
g
ANSI/IEEE C37.04-1979 Standard
Rating Structure for AC High-Voltage
Circuit Breakers Rated on a
Symmetrical Current Basis
g
ANSI C37.06-1987 AC High-Voltage
Circuit Breakers Rated on a
Symmetrical Current Basis – Preferred
Ratings and Related Required
Capabilities
g
ANSI/IEEE C37.09-1979 Standard Test
Procedure for AC High-Voltage Circuit
Breakers Rated on a Symmetrical
Current Basis
g
ANSI/IEEE C37.010-1979 Application
Guide for AC High-Voltage Circuit
Breakers Rated on a Symmetrical
Current Basis.
Footnotes:
1.
“xxxx” in type designation refers to the 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.
2.
Maximum design voltage for which the circuit breaker is
designed, and the upper limit for operation.
3.
K is the ratio of the rated maximum design voltage to the
lower limit of the range of operating voltage in which the
required symmetrical and asymmetrical interrupting
capabilities vary in inverse proportion to the operating
voltage.
4.
3,000FC indicates that fan cooling is included in the
switchgear structure for this rating. 3,000 A rating is
not available in outdoor equipment.
5.
To obtain the required symmetrical interrupting capability of a
circuit breaker at an operating voltage between 1/K times
rated maximum design voltage and rated maximum design
voltage, the following formula shall be used: Required
symmetrical interrupting capability = rated short-circuit
current (I) x [(rated maximum design voltage)/(operating
voltage)]. For operating voltages below 1/K times maximum
design voltage, the required symmetrical interrupting
capability of the circuit breaker shall be equal to K times rated
short-circuit current.
6.
Within the limitations stated in ANSI/IEEE C37.04-1979, all
values apply to polyphase and line-to-line faults. For single
phase-to-ground faults, the specific conditions are stated in
clause 5.10.2.3 of ANSI/IEEE C37.04-1979.
7.
Current values in this row are not to be exceeded even for
operating voltage below 1/K times rated maximum design
voltage. For operating voltages between rated maximum
design voltage and 1/K times rated maximum design voltage,
follow Footnote 5.
8.
Current values in this row are independent of operating
voltage up to and including rated maximum voltage.
9.
“Nominal 3-phase MVA class” is included for reference only.
This information is not listed in ANSI C37.06-1987.
10.
Standard duty cycle is CO - 15s - CO.
11.
Three-cycle (50 ms) interrupting is optionally available.
Technical data
23
Measure parameter Units
Circuit
breaker type
1
38-3AH3-
1500
General
Nominal voltage class kV 38.0
Nominal 3-phase MVA
class
9
MVA 1,500
Rated values
Rated voltage
Maximum design voltage (V)
2
kV rms 38.0
Voltage range factor (K)
3
---- 1.65
Insulation levels Withstand voltage levels
Power frequency kV rms 80
Lightning impulse
(BIL)
kV peak 150
Rated current
Continuous current
4
A rms
1,200
2,000
3,000FC
Short-circuit (at rated maximum
design voltage) (I)
5, 6, 10
kA rms sym 21
Interrupting time
11
ms
cycles
83
5
Permissible tripping delay (Y) Sec 2
Related
required
capabilities
Current
Rated maximum design voltage
(V) divided by K (=V/K)
kA rms 23
Maximum symmetrical interrupting
(K x I)
7
kA rms sym 35
Short-time current (K x I)
(three- Seconds)
kA rms sym 35
Closing and latching
(momentary)
Asymmetrical (1.6 x K x I)
8
kA rms 56
Peak (2.7 x K x I)
8
kA peak 95
Table 2: Type 38-3AH3 circuit breaker ratings (historic “constant MVA” ratings basis)