Advertisement
56 Guidelines for planning electrical installation
￭
Implementing an interlocking between the disconnecting devices
The customer (or the system integrator) must implement an interlocking circuit between the
DC switch/disconnector of the DC/DC converter unit and the energy storage disconnector.
The user must not be able to close the energy storage disconnector before closing the DC
switch/disconnector [Q11] of the DC/DC converter.
Selecting and routing the energy storage cables
￭
Recommended cables
The customer (or the system integrator) must acquire and connect the energy storage
cables. It is possible to use either 3-conductor shielded cable(s) or 4-conductor shielded
cables:
•
If you use a 4-conductor shielded cable, use 2 conductors for plus and 2 conductors
for minus and the shield for PE.
•
If you use a 3-conductor shielded cable, use 1 conductor for plus, 1 conductor for minus
and 1 conductor and the shield for PE.
￭
Typical cable sizes
See the technical data.
￭
Minimizing electromagnetic interference
The customer (or the system integrator) must obey these rules in order to minimize the
electromagnetic interference caused by rapid current changes in the energy storage cables:
•
Shield the energy storage cabling completely, either by using shielded cable or a metallic
enclosure. Unshielded single-core cable can only be used if it is routed inside a cabinet
that efficiently suppresses radiated emissions.
•
Install the cables away from other cable routes.
•
Avoid long parallel runs with other cables. The minimum parallel cabling separation
distance should be 0.3 meters.
•
Cross other cables at right angles.
Keep the cable as short as possible in order to minimize the radiated emissions and stress
on converter IGBT semiconductors. The longer the cable, the higher the radiated emissions,
inductive load and voltage peaks over the IGBTs of the DC/DC converter.
￭
Maximum cable length
The maximum cable length of the energy storage cable(s) is 100 m (328 ft).
Advertisement
