Trip Idiff = ( Idmin + slope section 2 /100 * (Ibias – End section 1)) A I bias ( A) I H.V ( Expected Id calculated Measured IL.V Errors % A) IL.V ( A) (A) R Y B R Y B Limits: ±-------- % Ir according to the technical ref catalogue Slope Section 3: When bias current is more than Ibias ≥ End section 2 Trip = ( Idmin + slope section 2 / 100 * ( End section 2 – End section 1 ) + slope section 3 / 100 * ( Ibias – End section 2 ) A I bias (A) I H.V Expected Id calculated Measured IL.V (A) Errors % (A) IL.V ( A) R Y B R Y B Limits: ±-------- % Ir according to the technical ref catalogue TEST OF 2ND HARMONICS:
Trip Idiff = ( Idmin + slope section 2 /100 * (Ibias – End section 1)) A I bias ( A) I H.V ( A) Expected IL.V ( A) Id calculated Measured IL.V (A) Errors % R Y B R Y B Limits: ±-------- % Ir according to the technical ref catalogue Slope Section 3: When bias current is more than Ibias ≥ End section 2 Trip = ( Idmin + slope section 2 / 100 * ( End section 2 – End section 1 ) + slope section 3 / 100 * ( Ibias – End section 2 ) A I bias (A) I H.V (A) Expected IL.V ( A) Id calculated Measured IL.V (A) Errors % R Y B R Y B Limits: ±-------- % Ir according to the technical ref catalogue TEST OF 2ND HARMONICS:
7ut_-_transformer_diff_relay_test.docx