Ajụjụ: Achọrọ m ịnwale eriri 220 kV, ogologo 8 km. Kedu ọkwa SR ka m chọrọ?
A: Usoro nhazi usoro 7: chọpụta ihe nlele chọrọ → gbakọọ C → atụmatụ L → gbakọọ f_res → nyochaa ọkwa → iterate → mechaa.
Nzọụkwụ -site -szọụkwụ - 220 kV USB, 8 km:
1. IEC 60840: V_ule=2.0 × 127 kV=254 kV. Ogologo oge 60 min.
2. C ≈ 8 km × 0.2 μF/km=1.6 μF.
3. Tụlee 3 × 100 kV/2 A reactors n'otu n'otu: L=26.7 H, f=24.4 Hz.
4. Ugbu a na 254 kV: I=V × 2πf × C=6.9 A. Mana 3×2A → 6A ngụkọta → Ọ BỤGHỊ OK.
5. Nweta nkwalite na 3× 100 kV/4 A reactors: ngụkọta m=12 A → OK. P_in=254×6.9/35=50 kW.
6. Ngụkọta arọ: 3×450 n'arọ + 200 + 150 + 100=~1,800 n'arọ.
Nchịkọta nha maka ọnọdụ ndapụta:
|
Ihe atụ |
V_ule (kV) |
C (μF) |
f (Hz) |
Sistemu akwadoro |
|
eriri 33 kV, 3 km |
48 |
0.6 |
45 |
60kV/2A ×1, 5 kW |
|
110 kV USB, 5 km |
160 |
1.0 |
24 |
200 kV/4A ×2, 20 kW |
|
220 kV USB, 8 km |
254 |
1.6 |
24 |
300kV/4A ×3, 50 kW |
|
eriri 400 kV, 5 km |
330 |
1.0 |
48 |
400 kV/2A ×2, 25 kW |
|
GIS 245 kV, 10 bays |
230 |
0.05 |
80 |
300kV/1A ×2, 5 kW |
|
Generator 100 MVA |
28 |
2.5 |
45 |
30kV/5A, 10kW |
Ihe ncheta dị mkpa:
• +20% oke na ogo voltaji reactor . +30% oke na ọkwa dị ugbu a.
• Ọ bụrụ P_in> 100 kW, tụlee ule ngalaba (nke ọtụtụ ụkpụrụ kwadoro).
• Ezi Q nwere ike ịdị ala karịa atụmatụ - conservative na-ezere ọdịda ubi.