Symbol

Description

Value

Ra

Armature resistance

0.002 Ω

X_d

D-axis armature reactance (p.u)

0.72

X_q

Q-axis armature reactance (p.u)

0.54

X_d^’

D-axis transient reactance (p.u)

0.35

X^”

Machine sub-transient reactance (p.u)

0.062

XI

Leakage reactance (p.u)

0.072

H

Inertial time constant of the shaft and turbine

2 kg/m²∙s

D

Load damping coefficient

0

T_d0'

d-axis open circuit transient time constant

5 sec

T_d0"

d-axis open circuit sub transient time constant

0.05 sec

T_q0^"

q-axis open circuit sub transient time constant

0.06 sec

S₁₀

Saturation factor at a voltage = 1 p.u

0.11

S₁₂

Saturation factor at a voltage = 1.2 p.u

0.48