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

Directional phase overcurrent (cont’d)Commissioning, settingCheck:c the connections,c the positions of the microswitches SW associatedwith the current and voltage inputs,c the general parameters in the status menu.Set the following:c type of time delay,v definite time DT,v IDMT: standard inverse time SIT,very inverse time VIT, extremely inverse time EIT,ultra inverse time UIT.c Is current: Is is set in rms, amps or kiloamps.The 999 kA setting may be used to inhibit theprotection: all the outputs are set to 0.c T time delay:v DT: T is the operation time delay,v SIT, VIT, EIT, UIT:T is the operation time delay at 10 Is,c characteristic angle θ.Please noteWhen several directional phase overcurrentprotections are included in the same Sepam,the characteristic angle setting applies to all of them.The normal and inverse directions correspondto the diagram below:inversenormalProtection detection directionCharacteristicscurvesettingcharacteristic angle θsetting (2) 30°, 45°, 60°acccuracy (1) ±5%Is set pointdefinite, std. inv., very inv., ext. inv, ultra inv.setting definite time 0.3In i Is i 24In expressed in ampsresolutionIDMTaccuracy (1) ±5%inhibition0.3In i Is i 2.4In expressed in amps1 A or 1 digit999 kAdrop out/pick-up ratio (93.5 ±5)%T time delaysetting definite time 50 ms i T i 655 sresolutionIDMTaccuracy (1) definite timeIDMTϕ1, ϕ2, ϕ3 measurement100 ms i T i 12.5 s10 ms or 1 digit±2% or +25 msclass 5 or +25 ms±12.5% at 2Ismeasurement range 0° to 359°accuracy (1)resolution 1°characteristic timesinstantaneous tripping timetime delayed tripping timememory timefault recognition timereset timeoutputs available for program logic±7.5%, or from 0 to +25 ms at 5 Is±5%, or from 0 to +25 ms at 10 Is±5%, or from 0 to +25 ms at 20 Is3° at In, Un50 ms < t < 70 ms60 ms typicalaccording to time delay20 ms < t < 55 ms35 ms < t < 53 ms30 ms < t < 70 msinstantaneous F52X/1 for normal zone 1 i X i 2F52X/3 for inverse zonetime-delayed F52X/2 for normal zone 1 i X i 2F52X/5 for normal zone (2 out of 3 phases)F52X/4 for inverse zoneF52X/6 for inverse zone (2 out of 3 phases)remote reading and remote setting* (3)function code F5252hidentification number X (4)parameters curve unit: 0..4 (5)(order of parameters) Is set point unit: AT time delayunit: 10 x mscharacteristic angle unit: degree(1)in reference conditions (IEC 60255-6).(2)setting is common to both relays.(3)the data formats are defined in the manuals which describe each communication protocol.(4)the number of protection functions depends on the type of Sepam.(5)meaning of curve index:0: definite time,1: inverse time,2: very inverse time,3: extremely inverse time,4: ultra inverse time.* function available as of version 9802 SFT2800.2/8 Protection functions