p10.2 - Excitation circuit parameters and transfer function Gov(p)

Excitation circuit parameters

10.2

if✱

Iб/Kf

Rв✱·

Sб

Ef✱ · Kf · Sб/Iб

(Kf)²

(Iб)^-2

1
1+p·Uб·tб/Ifб·Ifб/Uб

Lв✱/Rв✱

i_f*·R_в*

E_f*

1 + p·T_{_в}

; T_{_в} =

L_в*

R_в*·ω_{_н}

G_{_ов}(p) =

Δi_f*

ΔE_f*

1/R_в*

1 + p·T_{_в}

o.e.

Rotor active resistance at 15°C:
r_{_рх} = 0.122 Ω
Design resistance of the rotor winding:
r_{_р} = 1.32 · r_{_рх} = 0.16 Ω
Excitation circuit resistance: R_{_в} = r_{_р} + r_{_доб} = 0.16 + 0.032 = 0.19 Ω r_{_доб} = R_{_э} + 2 · R_{_б} + R_{_пр} (resistance equivalent to commutation

nose, two phases of exciter, wires)
We accept r_{_доб} = 0.2 · r_{_р} = 0.2 · 0.16 = 0.032 Ω

R_{_в*}

1 · R_{_б}

R_{_в}

93.2

0.19

= 490

Excitation circuit inductance, we accept:
L_{_в} = L_{_р} = X_{_гх} · T_{_д0} = 0.122 · 9.3 = 1.13 H
Excitation circuit time constant (with open stator winding):

T_{_в} =

L_{_в}

R_{_в}

1.13

0.19

= 5.94 s

G_{_ов}(p) =

490

1 + p·5.94