... secondary circuit and bus differential protection systemDisplay the phase relationship among the CT groups of a ... 6) Amplitude range of measured signal when measuring phase, 100~220V, 0.5A~1.5A(7) External reference ... RD+2)2A1mA10A10mA (3) Phase U-U,U-I,I-I(see Table 3) Table 3 Error of Power-frequency ... signal when measuring phase, Phase U1-U2, 30V~500V Phase I1-I2, 10mA~10.00A Phase U1-I2 or ...