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68 Electrical installation
Grid cable
Check the insulation of the grid cable according to local regulations before connecting it to
the converter.
Generator stator and generator cable
Check the insulation of the generator stator and cable as follows:
•
Check that all cables are disconnected from the converter output terminals U2, V2 and
W2.
•
Measure the insulation resistance between each phase conductor and the protective
ground conductor using a measuring voltage of 1000 V DC. The insulation resistance
of an ABB generator must exceed 100 Mohm (reference value at 25 °C or 77 °F). For
the insulation resistance of other generators, please consult the manufacturer's
instructions.
•
Note: Make sure that there is no condensed moisture inside the generator casing. If
you suspect that there is moisture, dry the generator before measurement.
•
Note: When using permanent magnet generator, it must be stable at the time of the
measurement.
ohm
Integrated DC chopper and DC resistor (option +D150+D151)
Every converter equipped with integrated DC chopper and DC resistor is tested for
insulation between the main circuit and the chassis at the factory (2700 V rms 50 Hz for
1 second). Do not make any voltage tolerance or insulation resistance tests.
Connecting the grid cables/busbars
Connection diagram
U1
G
V1
3~
W1
PE
PE
U<
L1
L2
L3
PE
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