cung cấp cho sinh viên với một kiến thức làm việc của các vấn đề hệ thống điện và kỹ thuật máy tính được sử dụng để giải quyết một số vấn đề. Các chủ đề bao gồm: phân tích dòng tải, công văn tối ưu của các thế hệ, lỗi ba pha đối xứng, các thành phần đối xứng | i. miXMlVLO I Example A 500-kV three-phase transposed line IS composed of one AC SR 1 272 000-cmil 45 7 Bittern conductor per phase with horizontal conductor configuration as shown in Figure . The conductors have a diameter of m and a GMR of in. Find the inductance and capacitance per phase per kilometer of the line. a b c C3----------- 12 35 ---------- 73 ------- 23 35 --------- n13 - 70 FIGURE Conductor layout for Example . Conductor radius IS r ft and GMRl 12 ft. GMD is obtained using 4 42 GMD 35 X 35 x 70 ft From the inductance per phase IS L In 7 mH km and from the capacitance per phase IS c - 0-Q juF km ln Example The line m Example IS replaced by two ACSR 636 000-cmĩl 24 7 Rook conductors which have the same total cross-sectional area of aluminum as one Bittern conductor. The line spacing as measured from the center of the bundle IS the same as before and is shown m Figure . a b c 0 0 O O 0 0 18 - I r---D12 - 35 ---------r 23 - 35 --- - D13 70 - FIGURE Conductor layout for Example . . OT l i f ON 1 HU O AHACJ IANUU JLZV The conductors have diameter of ir and ư GMR of m. Bundle spacing IS 18 m. Find the inductance and capacilance per phase per kilometer of the line and compare II with that of Example 42. Conductor radius IS r --El in. and irom Example GMD it. The equivalent geometric mean radius with two conductors per bundle for calculating inductance and capacitance arc by I and GMRl --- Si . ft to and 9 X 7 x To GMRC - - ft 12 .2 From the inductance per phase IS r . L In - - 1 .ÍẸ188 mH km and from 92 the capacitance per phase IS Comparing with the results of Example there S a. percent reduction in the inductance and a percent increase m the capnciiance. The function GMĐ. GMRL GMRC1 - emu IS .
