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58 Planning the electrical installation
Not allowed power cable types
Generator cable shield
If the generator cable shield is used as the sole protective earth conductor of the
generator, make sure that the conductivity of the shield is sufficient. See subsection
above, or IEC 61800-5-1.
To effectively suppress radiated and conducted radio-frequency emissions, the cable
shield conductivity must be at least 1/10 of the phase conductor conductivity. The
requirements are easily met with a copper or aluminum shield. The minimum requirement
of the generator cable shield of the converter is shown below. It consists of a concentric
layer of copper wires with an open helix of copper tape or copper wire. The better and
tighter the shield, the lower the emission level and bearing currents.
A four-conductor system (three phase conductors and a PE conductor in a PVC
conduit)
Corrugated cable with three phase conductors and a protective conductor or
cable in EMT
conduit
A well-shielded (Al/Cu shield) four-conductor system (three phase conductors
and a PE conductor or four conductors)
Symmetrical shielded cable with individual shields for each phase conductor is
not allowed on any cable size for grid and generator cabling.
1
Insulation jacket
2
Helix of copper tape or copper wire
3
Copper wire screen
4
Inner insulation
5
Cable core
PVC
EMT
PE
1
3
4
5
2
Содержание ACS880-87CC
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Страница 17: ...Safety instructions 17 1 3 2 4 5 6 7 ...
Страница 18: ...18 Safety instructions 8 9 ...
Страница 28: ...28 Introduction to the manual ...
Страница 52: ...52 Mechanical installation ...
Страница 66: ...66 Planning the electrical installation ...
Страница 74: ...74 Electrical installation Diagrams for the customer connections are presented below ...
Страница 75: ...Electrical installation 75 optional Fast shutdown ...
Страница 85: ...Maintenance 85 b c a Air flow direction 2 3 4 6 ...
Страница 87: ...Maintenance 87 2 5 4 ...
Страница 88: ...88 Maintenance 7 Arrow indicating the air flow direction 5 6 6 ...
Страница 90: ...90 Maintenance Air flow circulation b a ...
Страница 106: ...106 Maintenance ...
Страница 124: ...124 Control units of the converter ...
Страница 126: ...126 Dimension drawings ...
Страница 127: ...Dimension drawings 127 ...
Страница 128: ...128 Dimension drawings ...
Страница 142: ...142 Cooling and heating ...