Eaton Rapid Link 5 Manual

Also see for Rapid Link RAMO5: Manual

2 Engineering2.6 Power bus48 Rapid Link 5 · RAMO5 · RASP5 05/20 MN034004EN www.eaton.comCalculate the short-circuit current and the voltage drop as specified inDIN VDE 0100 to make sure that the protection requirements are being met.The power bus' cable length can be calculated as follows:Figure 18: Example: RAMO5Requirements for the group protection device during short-circuits.The short-circuit current Ik must be greater than the tripping current of theshort-circuit trip actuator Irm . It depends on the impedance or length of theenergy bus and the stub line.Depending on the power bus’ length and the configuration of the powerbranches, the total of all RAMO5 and RASP5 supply system currents duringcontinuous operation must not exceed 25 A (4-mm2 power bus).l =U 0 x 1000 – Zv – (Z stub x l stub )IrmZ power busl = Cable length (maximum: 100 m)U0 = 230 V (single-phase no-load voltage)Irm = Tripping current of short-circuit releasez v = External supply impedance (e.g., 100 mΩ)ZStub = 35.50 mΩ/m (stub line 1.5 mm2 )Z power bus = 13.40 mΩ/m (power bus 4.0 mm2 )21.50 mΩ/m (power bus 2.5 mm2 )￫ Take the voltage drop under load into account when selectingthe cable cross-section.The user is responsible for taking other applicable standards(e.g., VDE 0113, VDE 0289) into account.3 AC 400 V∼, 50/60 HzI rmI kQ1lM3 ∼RAMO1.5 mm24 mm2I >lStich1.5 m(4.92 ft)1.5 m(4.92 ft)