Q: Q txhais li cas, xam, thiab ua kom zoo rau kev sim teb?
A: Q=X_L / R=lub zog khaws cia / lub zog dissipated × 2π. Nws txiav txim siab voltage amplification thiab input zog txuag.
Cheebtsam ntawm tag nrho cov kuj R:
• Reactor tooj liab: 40–60%. Core poob: 15-25%. Lead tsis kam: 5-10%.
• Load dielectric (tanδ): 10–25%. Corona/PD: 0-5%.
Yam Q tus nqi los ntawm kev thauj khoom:
|
Load Hom |
Capacitance |
Hom Q |
|
Fais fab transformer |
5-20 nF |
30–60 |
|
GIS/substation |
1–50 nF |
40–100 |
|
MV kab (< 1 km) |
0.1–0.5 μF |
30–50 |
|
HV cable (>5 km) |
1–5 μF |
15–30 |
|
Lub tshuab hluav taws xob stator |
0.5–5 μF |
20–50 |
|
Capacitor bank |
10–100 μF |
10–20 |
Q vs. Input Power (rau 500 kVA tso zis):
Q=10 → 50 kW (loj diesel)|Q=30 → 16.7 kW (nruab nrab gen)
Q=50 → 10 kW (small gen)|Q=80 → 6.25 kW (mains)|Q=100 → 5 kW (mains)
Factors cuam tshuam Q:
• Reactor: loj dua qhov sib txawv → Q. Siv nplej-oriented steel. Litz hlau> 200 Hz.
• Ntau zaus: siab dua f → qis Q (cov nyhuv ntawm daim tawv nqaij).
• Load: siab dua C → qis Q. Voltage: siab dua V → qis Q (corona poob).
Teb kwv yees: Q_est ≈ 1/(tanδ_specimen + tanδ_reactor).
Yog tias tanδ_specimen=0.005 thiab tanδ_reactor=0.02 → Q ≈ 40.
⚠ Ib txwm xav tias Q 20% qis dua nominal rau lub tshuab hluav taws xob loj.