Volume 3 nr 1 / 2011 - Academia Oamenilor de Stiinta din Romania

140 Alexandru Ionuț Chiuță, Liviu Mihai Sima, Nicoleta Doriana SecăreanuUNUAYAUBYBUCY VY Y Yand if the neutral circuit has Y admittance:UAYAUBYBU VY Y Yand so, there is no neutral displacement, then V = 0.5.3. Capacitive unbalanceAABBCCUTo determine the currents passing through capacities from the ground andreturning through the ground (if the homopolar circuit admittance is infinite), theequivalent circuit can be determined either in the form of a voltage equivalentequal to the neutral displacement voltage in series with the capacitive admittanceseither as an injected current.Equation (5.2) can be written in the form:IN UNC YYA Y B Y C U Y KKYCCKkA,B,CFrom this relationship, the capacitive unbalance current I in the normal regime isdetermined, calculating U, I. This has the same value like the current determinedby neutral displacement voltage, applied to the admittance equal to the sum of thecapacitive admittances.In a three-phase power line, the capacities between conductors and betweenconductors and earth cause a capacitive consumption.~IRR RCFig. 4. Equivalent circuits for determining the capacitive currents returning through the earth.Copyright © Editura Academiei Oamenilor de Știință din România, 2011Watermark Protected