Ri4Power Installation instructions Ri4Power switchgear combinations may be installed either The substructure must be suitably prepared to support the directly in front of a wall or free-standing in the room. When weight of the switchgear enclosure. installing in front of a wall, a distance of 50 mm from the wall Particularly with raised floor constructions or suspended must be maintained. Free-standing switchgear must be ade- ceilings, the weights of the switchgear enclosures must be quately secured to the floor. If opting for free-standing instal- taken into account in the static calculations. lation, a back-to-back design is also supported. Here too, there must be 50 mm of free space to the left and right of a switchgear. Care must be taken to ensure that the switchgear enclosure is installed on a level surface. Suitable measures should be taken to compensate for uneven surfaces. Before baying the busbar systems, the individual switch panels should be aligned so that the busbar connections can be fitted prop- erly and without mechanical stresses. Design of the busbar systems with regard to infeed and rated current InA and rated short-time withstand current Icw There are various options for feeding the rated current InA Multiple infeed points: into a low-voltage switchgear enclosure. If two or more parallel infeeds are required, care should With many applications, the switchgear may only be ade- be taken to ensure that the chosen transformers are suitable in terms of their technical specifications. quately supplied with one infeed, and the infeed point is on the left or right of the switchgear enclosure. This means The infeeds should be arranged inside the low-voltage that the main busbar and the main switch of the switchgear switchgear enclosure in such a way that the distances enclosure must carry the entire current. Alternatively, a between the largest pieces of equipment and the infeed switchgear may infeed into the central area and distribute points are as short as possible. Only in this way is it possible the currents evenly to the left and right via the busbar to achieve a low-loss, optimum design in terms of the bus- system. With this arrangement, the heat loss arising in the bar cross-sections. busbar system can be reduced compared with a one-sided infeed, and the cross-section of the main busbar systems With a parallel infeed from several transformers, however, it may be reduced to the maximum current flowing to the left should be noted that the short-circuit output that can be sup- plied per transformer must be added together, provided the or right on the main busbar. upstream medium-voltage network can supply this energy. This can be avoided by dividing the switchgear into various busbar sections, if the various busbar sections are sepa- rated via coupling switches in normal operation and only need to be connected for servicing purposes. Since an increase in the required short-circuit withstand capability may entail huge additional costs for the main busbar system and the connected equipment, under some circumstances it may be more cost-effective to sub-divide the busbar into separate sections and use coupling switches. This addition- ally increases the system’s operational reliability in the event of a malfunction. In the case of ring shaped systems, the infeeds of the short- circuit currents and the rated currents are added together. Rittal Technical System Catalogue/Power distribution 2 - 44
Technical System Catalogue Ri4Power
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