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

Setting Adjust = None does not take into account the unbalance value and doesnot allow single-phase injection to be used.c example: heat riseCase of an unbalanced motor. Use of diagram B9.In = 400 AIb = 280 AI1, I2, I3v set OL1 = 95%v set OL2 = 115%v set T1 = 5 mnv set T2 = 20 mnv set Adjust = High (= 9)v Heating = 0%The equivalent current value should be calculated so as to enable the user toselect the right I/Ib ratio in the chart that gives t/T1 for f(OL, I/Ib).In the example i = 1.3 Ibieq 2 = (Ib+30%Ib) 2 + 9([Ib+30%Ib] / 1.732) 2i.e. ieq 2 = 364 2 + 9(210) 2 fi ieq = 728 Ahence I/Ib = 728 A/280 A = 2.6For an injection i = 364 A, in accordance with diagram B9 or B10, the protectionwill trip OL1 in a time period of t1 = 0.1514 x 5 x 60 = 45 s and OL2 in a timeperiod of t2 = 0.1865 x 5 x 60 = 55.9 sMonitor Heating the variation in heat rise Heating on the pocket terminal.Hot curvev reach Heating = 100%v start up injection and the chronometer at the same timev monitor the injection value on the ammeter (stability)v use the pocket termial to monitor the variation in heat rise HeatingWhen OL2 is reachedv the Sepam 2000 output relay stops the chronometerv read the t value measured by the chronometerv stop the injectionv press reset (1) on Sepam 2000 to erase the messages and reset the relay(if Heating > OL).Practical method of protection time measurement and testing using initialheat risev set OL2 to the initial heat rise value Eiv reset heat rise to zero using the pocket terminal (password + clear)v start up injection and the chronometerWhen OL2 = Ei is reachedv the chronmeter indicates the time tiv set OL2 to the desired valuev reset heat rise Heating to zero using the pocket terminal (access code + clear)v start up injection and the chronometer.When OL2 is reachedv the chronmeter indicates the time tf.v the protection operating time starting from initial heat rise Ei is t = tf - ti.Sepam 2000 - Testing1/19