instrument transformer in which the secondary voltage, in normal conditions of use, is substantially proportional to the primary voltage and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections, mõõtetrafo, milles sekundaarne pinge on tavapärastes kasutustingimustes oluliselt võrdeline primaarpingega ja erineb sellest faasis nurga all, mis on ühenduste sobiva suuna jaoks ligikaudu null