CONSTRUCTION OF GENERATOR CAPABILITY A CURVES
construction of generator ca atcs ca atcs capability curves construction of generator ca atcs ca atcs capability curves
Potier reactance dependence on the load and the new method for its determination • The Potier reactance value for the rated regime (x Pn )is approximately equal to the value of the reactive load i’ = i an·sinφ n (u = u n , i’ = i an·sinφ n i φ = 90 o ), i.e. (Figure 4): x P,n P,n = x’ P,90 , for i 90 ’ = i an· · sinφ n ……………………….… (1) • This rule was verified on the example of generator GTHW 360 (360 MW) for regimes around the nominal (P G ≈ P Gn and Q G ≈ Q Gn )i ), i.e. by comparison of: • measured values (I f,meas ), and • calculated values (I f,calc ), on the basis of Potier reactances (x P ) for Q G,cosφ=0 ≈ Q Gn . And, it is obtained I f,calc = I f,meas ±04% ±0.4%
Potier reactance dependence on the load and the new method for its determination • Based on the equivalence (1) and Figure 4, it is possible to write a general equivalence x P,n P,n = x’ P,90 , for i 90 ’ = i a· sinφ n ………………………….. (2) • The explanation is based on following facts: • The electromotive force has approximately the same values (e P ≈e l ), in • reactive load region i’ = i an·sinφ n and • nominal generator region, i.e. e’ l90 90≈e ln =0B and e’ P90 ≈ e Pn =0C (Figure 4), • The corresponding components of the magnetic leakage of • the rotor excitation coil and • the armature winding (on the stator), depend mostly on the reactive load.
- Page 1 and 2: CONSTRUCTION OF GENERATOR CAPABILIT
- Page 3 and 4: Introduction • Capability curves,
- Page 5 and 6: BASIC PRINCIPLES FOR THE DESIGN OF
- Page 7 and 8: BASIC PRINCIPLES FOR THE DESIGN OF
- Page 9 and 10: DETERMINATION OF GENERATORS POTIER
- Page 11 and 12: CONSTRUCTION OF GENERATOR CAPABILIT
- Page 13 and 14: Conclusion • It has been establis
- Page 15 and 16: Abstract The author came to the fol
- Page 17 and 18: THE POTIER REACTANCE DEPENDENCE ON
- Page 19 and 20: DETERMINATION OF POTIER REACTANCE (
- Page 21: Potier reactance dependence on the
- Page 25: Thank you for your attention
Potier reactance dependence on the load and<br />
the new method for its determination<br />
• Based on the equivalence (1) and Figure 4, it is possible to write a<br />
general equivalence<br />
x P,n<br />
P,n = x’ P,90<br />
, for i 90 ’ = i a· sinφ n ………………………….. (2)<br />
• The explanation is based on following facts:<br />
• The electromotive force has approximately the same values (e P ≈e l ), in<br />
• reactive load region i’ = i an·sinφ<br />
n and<br />
• nominal generator region, i.e. e’ l90 90≈e ln =0B and e’ P90<br />
≈ e Pn =0C (Figure 4),<br />
• The corresponding components of the magnetic leakage of<br />
• the rotor excitation coil and<br />
• the armature winding (on the stator),<br />
depend mostly on the reactive load.
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