Planning with SIVACON 8 PS - Siemens

Further information about planning7.2 Planning exampleDetermining the rated current per floorIBSUecos φPinstα= rated current per floor (A)= rated operating voltage (V)= power factor= installed power rating (kW)= load factor Determining the rated current of the trunking runIB = (INS · β) (INS = N · IBS)IB = 15 · 200 · 0.5 = 1500 AThe reduction factor is the demand and rated load factors for the total number of loads. Inthe absence of precise figures, reliable empirical values can be obtained from local utilitycompanies. However, these vary from region to region. Average values are listed in the tablebelow:Type of loadβResidential accommodation with electric ovens and water heaters 0.1...0.2Off-peak storage heating 0.8...1Lighting in office blocks and commercial buildings 0.7...0.9Lifts and and general facilities 0.6...0.8Conference rooms 0.6...0.8Small offices 0.5...0.7Large offices 0.4...0.8In accordance with the system selection criteria based on technical data and areas ofapplication in the "Planning principles" section, the LX high-voltage system is used in theplanning for this example (power distribution in multi-storey buildings with primarily verticaltrunking layout).Combining the assessment criteria and calculations results in an LXA busbar system beingselected with 5 conductors and full neutral conductor cross section, a current carryingcapacity of 1600 A and a short-circuit rating of Icw (t = 1 s) 60 kA.Selected busbar system: LXA0551Tap-off units with 3-pole 250 A fuse switch disconnectors (designed for use with NH1 fuselinks) are used to supply power to the distribution boards on each floor.Selected tap-off unit: LX-AK/FS250IEC-3Planning with SIVACON 8 PS244 Planning Manual, 10/2007, A5E01541101-01