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

Excessive starting time and locked rotor protectionANSI codefunction n°51LRF441Equipmentc single-phase current generatorc contactorc ammeterc chronometerc adapter for ECA modulec documentationWiringc diagram B1 or B2 or B8 or B12c protective relays:F441/1 for excessive starting timeF441/2 for start time delay in progressF441/3 for locked rotorF441/4 for excessive starting time or locked rotorF441/5 for i greater than 5% IbTestc read the section entitled measurement and testingmethodThe protection may be tested on each phaseindividually with single-phase current.c status parameter settingv select the In value of the CT primary circuitsv set the value of Ibv check the microswitches on the ECM modulev or check and set the microswitches on the ECAmodule.Procedurec protection parameter setting: LR/EStv set Is to the desired value as a % of Ibv set ST motor start timev set LT locked rotor timev disable the protections (2) :O/C X, Unbalance, E/F X (if sum of 3 CTs is used)Testing of Is set point (diagram B1 or B2 or B8).IIsIb5%Ib0STc parameter settingv set ST to 0.5 s (minimum)v set LT to 0.5 s (minimum)c testv start up the injection unit with a current > 5% Ib and then, after 1 sv gradually inject the current or currents until the locked rotor protective relaypicks upv read the i value on the ammeterTesting of excessive starting time ST (diagram B1 or B2 or B8)c parameter settingv set ST to the desired valuec testv preset the injection to 1.2 times Isv stop the injection and reset Sepam 2000 and the chronometer to zero (1)v start up injection and the chronometer at the same timev Sepam's 2000 output relay stops the chronometerv read the t value on the chronometerLTtRemark:If current injection is controlled by a static contactor, it is necessary to ensure thatleakage current is less than 5% of Ib and does not interfere with testing.(1)this function may only be activated if your program logic hasbeen customized.(2)remember to reactivate the protections at the end of testing.X = number of the protective relay.Testing of locked rotor time LT (diagram B12)c parameter settingv set ST to 0.5 sv set LT to the desired valuec testv preset the injection as follows:- contactor closed i > Is- with load resistance Is > i > 5% Ibv stop injection and reset Sepam 2000 to zerov start up injection with the contactor openv reset the chronometer to zerov after a first time period greater than ST (0.5 s), close the contactor and start upthe chronometer at the same timev Sepam's 2000 output relay stops the chronometerv read the t value on the chronometer1/30Sepam 2000 - Testing