Sepam - HV/MV Protection and control units (ENG) - Trinet

Resistive earth fault (cont’d)SensorsResistive earth fault protection is related to thecurrents connected to the following connector:current sensor connectorCSH120 or2ACSH200Special usesThe resistive earth fault function is used in publicdistribution networks.The EPATR-B curve defined by Electricité de Francecorresponds to the time delay setting T = 0.8 saccording to the following chart:Io time delay (s) Io time delay(s)(A) t=1s t=0.8s (A) t=1s t=0.8s0.6 153.24 122.59 14.0 13.38 10.700.7 137.40 109.92 15.0 12.50 10.000.8 125.00 100.00 16.0 11.74 9.390.9 115.00 92.00 17.0 11.06 8.851.0 106.74 85.39 18.0 10.46 8.371.1 99.76 79.81 19.0 9.93 7.941.2 93.81 75.05 20.0 9.44 7.551.3 88.64 70.91 25.0 7.60 6.081.4 84.11 67.29 30.0 6.36 5.091.5 80.10 64.08 35.0 5.48 4.381.6 76.53 61.22 40.0 4.80 3.841.7 73.30 58.64 45.0 4.29 3.431.8 70.40 56.32 50.0 3.86 3.091.9 67.75 54.20 55.0 3.53 2.822.0 65.34 52.27 60.0 3.24 2.592.5 55.79 44.63 65.0 2.99 2.393.0 49.04 39.23 70.0 2.79 2.233.5 43.96 35.17 75.0 2.60 2.084.0 40.00 32.00 80.0 2.44 1.954.5 36.80 29.44 85.0 2.30 1.845.0 34.15 27.32 90.0 2.18 1.745.5 31.93 25.54 95.0 2.06 1.656.0 30.01 24.01 100.0 1.96 1.576.5 28.25 22.60 110.0 1.79 1.437.0 26.29 21.03 120.0 1.65 1.327.5 24.58 19.66 130.0 1.53 1.228.0 23.08 18.46 140.0 1.41 1.138.5 21.75 17.40 150.0 1.33 1.069.0 20.58 16.46 160.0 1.24 0.999.5 19.51 15.61 170.0 1.18 0.9410.0 18.56 14.85 180.0 1.11 0.8911.0 16.91 13.53 190.0 1.05 0.8412.0 15.54 12.43 200.0 1.00 0.8013.0 14.38 11.50 >200 1.00 0.80Commissioning, settingEarth fault current is measured by a CSH120 or CSH200 core balance CTconnected to the 30 A rating (terminals 3 and 4).SettingsCheck:c the connections,c the positions of the microswitches SW associated with the current inputs,c the general parameters in the status menu.Set the following:c Iso current: Iso is set in rms, amps or kiloamps.The 999 kA setting may be used to inhibit the protection: all the outputs are set to 0.c T time delay: T is the operation time delay for Io > 200 A.CharacteristicsIs set pointsettingresolution0.6 A i Iso i 5 A0.1 Aaccuracy (1) ±5%inhibitiondrop out/pick-up ratio15 A set pointsetting999 kA(93.5 ±5)% for Io u 1.5 Afixedaccuracy (1) ±5%return varianceT time delaysettingresolution1 Aaccuracy (1) ±10%characteristic timesinstantaneous tripping timetime-delayed tripping timememory timefault recognition timereset timeinhibition input relayK857outputs available for control logic500 ms i T i 1 s10 ms or 1 digit< 50 mssee curve< 30 ms< 30 ms< 45 ms1 = inhibition0 = validationinstantaneous F101/1time-delayed F101/2Io ≥ 15A F101/3remote reading and remote setting* (2)function code F10identification number 110hparameters Iso set point unit: 0.1 x A(order of parameters) T time delay unit: 10 x ms(1)in reference conditions (IEC 60255-6).(2)the data formats are defined in the manuals which describe each communication protocol.* function available as of version 9802 SFT2800.2/20 Protection functions