Dth 31 relay manual

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Relay operating current = Pickup setting + Bias Setting * Bias current The pickup setting in DTH 31 = (constant) Bias Current = (I1+I2)/2 Operating Current at normal tap with Bias setting Is = (or) I Operating 1A = + * Bias Current Bias current = (I1+I2)/2 I Difference 1A = I1- I2 Operating current at extreme taps is calculated with the same procedure. areva mbch 12 13 differential protection pdf document, type dth 31 32 dttm 11 12 high speed biased differential, alstom l3 kbch br 04 05 gb pdf document, areva mbch 12 13 differential protection relay scribd, ddt electricalmanuals net, ge p technical manual pdf download, pdf. All other DTH 31/DTH 32 The relay complies with IS /IEC circuitry is similar to that of the DTH The highset circuit operates when Appendix C to class III. 31 relay. the differential current exceeds 10 times the rated current.