- Rcd Residual Current Device Selection Tt Grounding System L1 L2 L3 U N 88 Z R Ra Total Resistance Of The Ground E 1 (138.25 KiB) Viewed 34 times
!!!!!!!RCD (Residual Current Device) Selection: TT grounding system: L1 L2 L3 U₂ N 88 Z R₁ RA: Total resistance of the ground electrode and protective conductor of the exposed conductive part to be protected. Zs: Loop impedance of the error loop (consisting of power source, line conductor to the fault location and protective conductor between fault location and power source) L1 12 RCD L3 N Nominal Current (I) of RCD Zs: 0,1 Ω RA: 100 0 50 If RA < the residual-current device can guarantee protection through automatic 1.3xlan disconnection. Rated residual current of the residual-current device (lan) What is the risk of using a residual current device that has a larger residual current (Ian) detection characteristic? Single Line Diagram of the PV System: III