CONSTRUCTION OF GENERATOR CAPABILITY A CURVES
construction of generator ca atcs ca atcs capability curves construction of generator ca atcs ca atcs capability curves
BASIC PRINCIPLES FOR THE DESIGN OF CAPABILITY CURVE • Vector diagrams of excitation currents of saturated machine • The curve of saturated machine, derived from no-load test, i f0 (e) • It is particularly difficult to quantify additional magnetic saturation on the part of the rotor of loaded d machine, i.e. . i fl = f(e l ). • Influence of additional saturation of the rotor magnetic circuit is taken into account by introduction of Potier reactance (x P >x l , x l is stator leakage reactance) which h results in increased EMF( (e P = u+x P·i > u+x+ l i = e l ). Figure 3: Magnetization curves i f0 (e) and i fl (e l ); diagrams of excitation currents: i fa,n = x d -x P and i fR fR =i fP +i fa,n
BASIC PRINCIPLES FOR THE DESIGN OF CAPABILITY CURVE • Capability ity curve of generator e with saturated a magnetic circuit cu • The increase part of saturation current • Δi f (e P ) = Δi fu + Δi fs+ Δi fr (Figure 3) • beginning point C uns goes down for Δi f (e P ) (C R ,C 1 ,C 2 and C M ) • the corresponding arches i fi =Const Const. are moved down as well. • Thus, for pure reactive load (p = 0), • instead of point q' M , point q M < q' M is obtained • q' M - reactive load maximum for generator with saturated magnetic circuit. Figure 4: Diagrams of electromotive forces and excitation currents for generator with saturated magnetic circuit
- Page 1 and 2: CONSTRUCTION OF GENERATOR CAPABILIT
- Page 3 and 4: Introduction • Capability curves,
- Page 5: 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 and 22: Potier reactance dependence on the
- Page 23 and 24: Potier reactance dependence on the
- Page 25: Thank you for your attention
BASIC PRINCIPLES FOR THE DESIGN<br />
<strong>OF</strong> <strong>CAPABILITY</strong> CURVE<br />
• Capability ity curve of generator e with saturated a magnetic circuit<br />
cu<br />
• The increase part of saturation current<br />
• Δi f (e P ) = Δi fu<br />
+ Δi fs+ Δi fr (Figure 3)<br />
• beginning point C uns goes down for Δi f (e P ) (C R ,C 1 ,C 2<br />
and C M )<br />
• the corresponding arches i fi =Const Const. are moved<br />
down as well.<br />
• Thus, for pure reactive load (p = 0),<br />
• instead of point q' M , point q M < q' M is obtained<br />
• q' M - reactive load maximum for generator with<br />
saturated magnetic circuit.<br />
Figure 4: Diagrams of electromotive forces and excitation currents<br />
for generator with saturated magnetic circuit
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