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

Negative sequence overvoltageANSI code 47Block diagramfunction n° F40X 1 i X i 2U21U32Vi > VsiT0F40X/2OperationF40X/1This function picks up when the negative sequenceof voltages (Vi) is greater than the setting (Vsi).It includes a definite time T time delay.The negative sequence voltage Vi is determined fromthe three phase voltages:–> –> –> –>Vi = (1/3) [V1 + a 2 V 2+ aV 3]–> –> –>Vi = (1/3) [U 21- a U 32]with a = e j2π / 3This function is used to display the negativesequence voltage on the pocket terminal.The voltage is expressed in primary volts or kilovolts.Commissioning, settingCheck:c the connections,c the positions of the microswitches SW associatedwith the voltage inputs,c general parameters in the status menu.Access to the protection settings is impossible if theNumber setting accessible via the status menu is setto V or 1U. The protection is inhibited in this case:all the outputs are set to zero.Set the following:c Vsi set point: Vsi is set in rms, volts or kilovolts.The 999 kV setting may be used to inhibitthe protection: all the outputs are set to 0.c T time delay.SensorsThis protection is related to the voltages of the VTsconnected to the following connector:SepamconnectorS36* 4A (1)S26* 3A(1)3A connector for S36*TR and S36TS models.CharacteristicsVsi set pointsettingaccuracy (1)drop out/pick-up ratioresolutionT time delaysettingaccuracy (1)resolutioncharacteristic timesinstantaneousoutput response timetime delayed tripping timememory timefault recognition timereset timeVi measurementmeasurement rangeaccuracyresolution2%Vn to 80%Vn±2% for Vi u 10% Un±5% for Vi < 10% Un(97.5 ±2.5)% with Vsi > 10% Un1 V ou 1 digit50 ms to 655 s±2% or 25 ms with 2 Vsi10 ms or 1 digit< 85 msT< 65 ms< 60 ms< 80 ms0 to 150% Un±2% for Vi > 10% Un±5% for Vi < 10% Un1 V or 1 digitoutputs available for program logicinstantaneous F40X/1 1 i X i 2time delayedF40X/2remote reading, remote setting** (2)function code F4040hidentification number X (3)parameters Vs set point unit: V(order of parameters) T time delay unit: 10 x msVn = Un / e(1)in reference conditions (IEC 60255-6).(2)the data formats are defined in the manuals which describe each communication protocol.(3)the number of protection functions depends on the type of Sepam 2000.* S35, S25 for earlier versions.** function available as of version 9802 SFT 2800.2/46 Protection functions