SACE Emax DC: Direct Current Applications - VAE ProSys sro

Protection functions and setting values - PR122/DCFunction Trip Threshold Trip Time Poss. Relation Thermal Zonethreshold steps Time Step excl. t=f(I) memory selectivityOTOverload I1= 0.4….1 x In 0.01 x In With current I = 3 x I1 3 s (1) – IEC60255-8 ■ –protectiont1= 3 s....102 sTolerance (2) Release between ± 10% If ≤ 6 x In.05 and 1.2 x I ± 20% If > 6 x InSelective short-With current I > I2circuit protection I2= 0.6….10 x In 0.1 x In t2= 0.05 s….0.8 s 0.01 s ■ t=k – ■t2sel= 0,04 s…..0,2 s 0,01 sTolerance (2) ± 7% If ≤ 6 x In The better of the two figures:± 10% If > 6 x In ± 10% or ± 40 msWith current I = 10 x InI2= 0.6….10 x In 0.1 x In t2= 0.05 s….0.8 s 0.01 s ■ t=k/I 2 ■ –Tolerance (2) ± 7% If ≤ 6 x In ± 15% If ≤ 6 x In± 10% If > 6 x In ± 20% If > 6 x InInstantaneousshort-circuitprotection I3= 1.5….10 x In 0.1 x In Instantaneous – ■ t=k – –Tolerance (2) ± 10% ≤ 30 msProtection againstovertemperature may not be set – Instantaneous – – temp=k – –(1) The minimum trip value is 1 s, regardless of the type of curve set (self-protection)(2) These tolerances are valid in the following conditions:- self-supplied release at full power and/or auxiliary power supply (without start-up)- trip time set ≥ 100 ms(3) Non intervention timeThe following tolerance values apply in all cases not covered by the above:Trip thresholdTrip timeL Release between 1.05 and 1.25 x I1 ± 20%S ± 10% ± 20%I ± 15% ≤ 60msOthers ± 20%ABB SACE