Question

Problem 1.A (2 pnts) In a balanced 3-phase circuit, a 3-phase voltage source with negative phase sequence is connected to a three phase load. If the current between the C and B nodes at the load is ſcb = 1202 - 120° Arms what is the line current ſaa? + CC Cm A 2 line Problem 1.B (8 pnts) A balanced 3-phase circuit consists of a Y-connected 3-phase source with negative phase sequence, a delta-connected load, and a 3-phase transmission line listed below. Find the reading (in watts) of the wattmeter. Van = 12020°, ZAL = 9.0+ j9.0 22, Z, = 2.0+ j2.0 22, Zline = 1.0+ jl.0 22 LI

Answer 1

D) 36 voltage Source with -ve phasae sequency . Va = V me Consider source is in stas and - VG = Um L-240 load also in star Vervm 1-1200 in stare line Current-phone Current fCB²120 L-120 A Top 120 LE IN PD) van = 12010 i20 atja ; Zs=2412 : . Perphase & circuit Pa van. zsteline & R . van 25 = 12000 (2+j2)(4+j)(3+33) Pas loojio = 1416 L-454 Isa 14.144-45-100 = 16.14 l-165A; Tc=16:144-45-240 = 16114142854 zine

34 power indicated by watt meter ß Vab Pa Vaz 12010 Y = 1201260 Ve=120 [-120 E B x 14.141-45 x 1201-30 Vab= 120430 - 760.65-2838.80 V360s Power indicated legualtmeter is 760.65