136 Technical data
AC output connection specification
Voltage Types -0100kW-A, -0250kW-A and -0500kW-A: 300 V AC 3-phase ± 10%
Types -0315kW-B, -0630kW-B and -0875kW-B: 350 V AC 3-phase ± 10%
Type -1000kW-C : 400 V AC 3-phase ± 10%
Allowed electrical system
type
3-phase IT (ungrounded) system. Galvanic isolation for each inverter is
needed.
Transformer The transformer must be suitable for IGBT-based inverter use with high du/dt
values against the ground. Dedicated low-voltage winding is needed for each
inverter. Static screen between windings with proper dimensioning is
needed.
For details on selecting the transformer, see Selecting the transformer on
page 73.
Short-circuit withstand
strength (IEC 60439-1)
Type -0100kW-A
: Maximum allowable prospective short-circuit current is
10 kA when protected by fuses given in fuse tables.
Types
-0250kW-A … -1000kW-C: Maximum allowable prospective short-
circuit current is 50 kA when protected by fuses given in fuse tables.
When
temporary grounding for work is applied (the grounding cables are
connected to the connecting knobs of the AC and DC busbars and PE of the
inverter): the maximum allowable prospective short-circuit current is
decreased to 25 kA / 1 s. If the connected grounding cables and clamps are
not equivalent to the prospective short-circuit rating of the inverter, the total
rating will be lower.
Frequency 48 to 63 Hz withstand with normal dimensioning (grid-compliance may
require disconnection at smaller values.) Maximum rate of change 17%/s
Imbalance Max. ± 3% of nominal phase to phase AC line voltage
Voltage dips Max. 25%
Note: If the inverter is expected to survive voltage dips (low-voltage ride-
through), auxiliary power supply must be ensured, for example, by an
uninterruptible power supply.
Fundamental power factor
(cos phi
1
)
1
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