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consider an upgrade of a three-phase transmission system in which the operating line-to-line voltage is doubled and the
consider a lossless transmission line with only a series reactance x as shown in figure p1031a find an expression for
a balanced three-phase wye-connected 2400- v 60-hz source supplies two balanced wye connected loads in parallel the
a three-phase load connected to a 440-v bus draws 120 kw at a power factor of 085 lagging in parallel with this load is
a single-phase industrial plant consists of two loads in parallelit is operated from a 500-v 60-hz source an additional
a 15-kva 2200220-v two-winding single phase transformer is connected as an auto trans-former to step up voltage from
a single-line diagram of a three-phase transformer bank connected to a load is given in figure p1154 find the
a 5-kva 480120-v two-winding 60-hz single-phase transformer has an efficiency of 95 while delivering rated load at
a three-phase 600-kva 2300230-v y-y transformer bank has an iron loss of 4400 w and a full load copper loss of 7600 w
three single-phase 100-kva 2400240-v 60-hz transformers each of which has an equivalent series impedance of 0045j016
a three-phase transformer bank consisting of three 10-kva 2300230-v 60-hz single-phase transformers connected in y- is
a 5-mva 66132 kv three-phase transformer supplies a three-phase resistive load of 4500 kw at 132 kv what is the load
a one-line diagram of a three-phase distribution system is given in figure p1151 determine the line-to-line voltage at
two 1150115-v transformers are to be interconnected for a 2300230-v operation and b 1150230-v operation show the
two single-phase transformers each rated 2400 120-v are to be interconnected for a 4800240- v operation and b 2400120-v
three single-phase 10-kva 2400120-v 60- hz transformers are connected to form a three phase 4160208-v transformer bank
a single-phase 10-kva 2300230-v 60-hz two-winding distribution transformer is connected as an autotransformer to step
consider the solution of example 1141 by means of a phasor diagram determine the load power factor for which the
a 300-kva transformer has a core loss of 15 kw and a full-load copper loss of 45 kwa calculate its efficiency
a 75-kva 230115-v 60-hz transformer was tested with these resultsbull open-circuit test 115 v 163 a 750 wbull
a 3-kva 220110-v 60-hz single-phase transformer yields these test databull open-circuit test 200 v 14 a 50 wbull
these data were obtained from tests carried out on a 10-kva 2300230-v 60-hz distribution transformerbull open-circuit
the efficiency of a 400-kva single-phase 60-hz transformer is 9877 when delivering full-load current at 08 power factor
the following data were obtained on a 25- kva 2400240-v 60-hz single-phase distribution transformerbull open-circuit
a 25-kva 2200220-v 60-hz single-phase transformer has an equivalent series impedance of 35 j40 referred to the primary