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88 Technical data
Derating
￭
The load capacity (current and power) decreases if the installation site altitude exceeds
1000 meters (3281 ft), or if the ambient temperature exceeds 45 °C (113 °F).
Ambient temperature derating
In the temperature range +45 °C (+113 °F) ... +55 °C (+131 °F), the rated output current is
decreased by 2.5% for every additional 1 °C (1.8 °F). The output current is calculated by
multiplying the current given in the rating table by the derating factor.
Example If the ambient temperature is 55 °C (+131 °F), the derating factor is
100% - 2.5 %/°C · 10 °C = 75% or 0.75. The output current is then 0.75 · I
For converter output current derating based on coolant inlet temperature, see section
Temperature limits (page
Altitude derating
At altitudes above 1000 m (3281 ft) above sea level, the derating is 1% for every 100 m
(328 ft) on maximum continuous current. This can be compensated by reducing maximum
ambient air temperature by 1 °C (1.8 °F) for every 100 m (328 ft). Derating is allowed only
on maximum continuous current for grid and generator. If the installation site is located
higher than 2000 m (6562 ft) above sea level, contact your local ABB representative.
Type equivalence table
Converter type
ACS880-77CC-
Generator-side converter
modules + Grid-side con-
verter modules+ LCL
U
= 690 V
N
6880A/5500A-7
2×(4×R9iLC + 4×R9iLC +
121).
Construction type
1×LCL)
Basic module type (R9iLC)
Generator-side converter
ACS880-104LC-... (+E205)
0900A-7
.
gen
Grid-side converter
ACS880-104LC-... (+E205)
0860A-7
3AXD10000011539
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