Function Range or value AccuracyRelay open angle ROA (0-90) degrees ± 2.0 degreesOperate time, non-directionalresidual over current60 ms typically at 0 to 2 x Iset 60 ms typically at 0 to 2 x 1setReset time, non-directionalresidual over current65 ms typically at 2 to 0 x Iset 65 ms typically at 2 to 0 x 1setOperate time, non-directionalresidual overvoltage45 ms typically at 0.8 to 1.5 x Uset 45 ms typically at 0.8 to 1.5 x UsetReset time, non-directionalresidual overvoltage85 ms typically at 1.2 to 0.8 x Uset 85 ms typically at 1.2 to 0.8 x UsetOperate time, directionalresidual over current140 ms typically at 0.5 to 2 x Iset -Reset time, directionalresidual over current85 ms typically at 2 to 0.5 x Iset -Critical impulse time non-directional residual overcurrent35 ms typically at 0 to 2 x Iset -Impulse margin time non-directional residual overcurrent25 ms typically -8.4 Thermal overload protection, two time constantsTRPTTR (49)8.4.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberThermal overload protection, two timeconstantsTRPTTRSYMBOL-A V1 EN498.4.2 FunctionalityIf a power transformer or generator reaches very high temperatures the equipment mightbe damaged. The insulation within the transformer/generator will have forced ageing. Asa consequence of this the risk of internal phase-to-phase or phase-to-ground faults willincrease. High temperature will degrade the quality of the transformer/generatorinsulation.Section 8 1MRK 502 048-UUS ACurrent protection234Technical manual
