Emax Low voltage air circuit-breakers - ABB Download Center

Additional Protection functions and setting values - PR122 with PR120/VFunction Trip Threshold Trip Time Poss. Relationthreshold steps Time Step excl. t=f(I)UVOVRVRPUFOFUndervoltage I8= 0.5….0.95 x Un 0.01 x Un With current U < U8 0.1 s ■ t=kprotectiont8= 0.1 s....5 sTolerance (1)The better of the two figures:± 5% ± 20% or ± 100 msOvervoltage I9= 1.05….1.2 x Un 0.01 x Un With current U > U9 0.1 s ■ t=kprotectiont9= 0.1 s....5 sTolerance (1)The better of the two figures:± 5% ± 20% or ± 100 msResidual voltage I10= 0.1….0.4 x Un 0.05 x Un With current U 0 > U10 0.5 s ■ t=kprotectiont10= 0.5 s....30 sTolerance (1)The better of the two figures:± 5% ± 10% or ± 100 msReverse power P11= -0.3….-0.1 x Pn 0.02 x Pn With current P < P11 0.1 s ■ t=kprotectiont11= 0.5 s....25 sTolerance (1)The better of the two figures:± 5% ± 10% or ± 100 msUnderfrequency f12= 0.90….0.99 x fn 0.01 x fn With current f < f12 0.1 s ■ t=kprotectiont9= 0.5 s....3 sTolerance (1)The better of the two figures:± 5% ± 10% or ± 100 msOverfrequency f13= 1.01….1.10 x fn 0.01 x fn With current f > f13 0.1 s ■ t=kprotectiont10= 0.5 s....3 sTolerance (1)The better of the two figures:± 5% ± 10% or ± 100 ms(1) These tolerances are valid in the following conditions:- self-supplied trip unit at full power and/or auxiliary power supply (without start-up)- two- or three-phase power supply4Power supplyThe PR122 trip unit does not normally require any external power supplies, being self-suppliedfrom the current sensors (CS): a three-phase 70 A current is sufficient to activate the protectionfunctions and the ammeter, whereas three-phase 160 A are required to turn the display on.Once the display is turned on, the minimum current for visualisation is I > 5% of the rating plug.The unit ensures fully self-supplied operation. When an auxiliary power supply is present, it isalso possible to use the unit with the circuit-breaker either open or closed with very low currentflowing through.It is also possible to use an auxiliary power supply provided by the PR030/B portable battery unit(always supplied), which allows the protection functions to be set when the trip unit is not selfsupplied.PR122/P stores and shows all the information needed after a trip (protection tripped, trip current,time, date). No auxiliary supply is required for this functionality.PR122/P PR120/D-M PR120/K PR120/D-BTAuxiliary power supply 24 V DC ± 20% from PR122/PR123 from PR122/PR123 from PR122/PR123(galvanically insulated)Maximum ripple 5%Inrush current @ 24V ~10 A for 5 msRated power @ 24V ~3 W +1 W +1 W +1 W(*) PR120/V can give power supply to the trip unit when at least one line voltage is equal or higher to 85V RMS.ABB SACE 4/17