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

Percentage-based single-phase overcurrentANSI code 50-51function n° F03X for phase overcurrent I1F04X for phase overcurrent I2F05X for phase overcurrent I31 i X i 2F11Y for phase overcurrent I1’F12Y for phase overcurrent I2’F13Y for phase overcurrent I3’1 i Y i 2OperationThis function includes 3 independent single-phaseovercurrent protections.Each single-phase overcurrent protection picks upwhen the related current reaches the operation setpoint, expressed as a percentage of 1 A or 5 Aaccording to the parameter setting of the currentinputs.It is time-delayed with a definite time delay (DT).The set point and time delay are independent foreach single-phase function.Current measurementIn order to facilitate commissioning of the function,the values of the 3 single-phase currents may bemeasured as a percentage of 1 A or 5 A usingthe pocket terminal.Commissioning, settingCheck:c the connections,c the positions of the microswitches SW2 associatedwith the current inputs,c the general parameters in the status menu(rated frequency).Set the following:c Is set point: Is is set as a relative value,% of 1 A or 5 A.The 999% 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.SensorsThe percentage-based single-phase overcurrentprotection is related to the currents connectedto the following connectors:current sensor connectorI1, I2, I3 1 A or 5 A CT 2BI1’, I2’, I3’ 1 A or 5 A CT 3BBlock diagramI1(I1’)I2(I2’)I3(I3’)Is set pointsettingresolution 1%accuracy (1) +5%inhibition 999%drop out/pick-up ratio (93.5 ±5)%T time delaysettingresolutionaccuracy (1)3% to 200% of 1 A or 5 A(according to parameter setting)50 ms to 655 ms10 ms or 1 digit±2% or 35 msmeasurement of single-phase current as % of Inmeasurement range1% to 999% of 1 A or 5 A(according to parameter setting)accuracy (1) ±5 %resolution 1%characteristic timesinstantaneous tripping timetime-delayed tripping timememory timefault recognition timereset timeI > IsI > IsI > IsCharacteristics< 85 msT< 65 ms< 65 ms< 85 msoutputs available for program logicinstantaneous F03X/1, F04X 1, F05X/1 1 i X i 2F11Y/1 F12Y/1 F13Y/1 1 i Y i 2time-delayed F03X/2, F04X/2, F05X/2 1 i X i 2F11Y/2, F12Y/2, F13Y/2 1 i Y i 2remote reading, remote setting* (2)TTT000F03X/2 (F11Y/2)F03X/1 (F11Y/1)F04X/2 (F12Y/2)F04X/1 (F12Y/1)F05X/2 (F13Y/2)F05X/1 (F13Y/1)function codeF03X, F04X, F05X03 h, 04 h, 05 hF11Y, F12Y, F13Y11 h, 12 h, 13 hidentification number X, Y (3)parameters Is set point unit: %(order of parameters) T time delay unit: 10 x ms1)in reference conditions (IEC 60255-6).(2)the data formats are defined in the manuals that describe each communication protocol.(3)the number of function modules relays depends on the type of Sepam.* function available as of version 9802 SFT2800.Protection functions2/61