IEEE Power & Energy Magazine - Spanish - November/December 2022 - 85

Estándares como C50.13 del IEEE
y 60034-3 de CEI definen la capacidad
de Mvar en los terminales
del generador, con un factor de
potencia sobreexcitado de 0.8; 0.85
y 0.9. Mientras más bajo sea el factor
de potencia, más grande será la
máquina. Además, se recomienda
que el generador también sea capaz
de operar con un factor subexcitado
de 0.95 MW nominal. La
figura 4 muestra cómo los códigos
de red pueden definir la capacidad
reactiva como límites, ya sea en los
terminales del generador (en rojo)
o la conexión de la red en el lado
de AT del transformador elevador
generador (en púrpura), donde se
utilizan ecuaciones tradicionales
de dos puertos para completar la
transformación matemática.
cp [J/kgK]
mr [kg]
(Ifn)2 [A]
×
[kW/∆K]
Rr(75 °C) [Ω]
Tr [K]
-
Tcair
[K]
∆[K]
÷
cp [J/kgK]
3 (In)2 [A]
×
Rs(75 °C) [Ω]
Ts [K]
TFe [K]
-
×
[kW]
ms [kg]
[kW]
÷
[kW/∆K]
∆[K]
cp[KWs/K]
÷
{seg.]
Inercia térmica
[kW]
Inercia térmica
×
Cp [KWs/K]
÷
{seg.]
Estator
Rotor
figura 5. Método general utilizado para estimar la constante de inercia térmica del
rotor y estator de un un generador síncrono.
Rotor
Inercia térmica (masa)
10,000
5,000
100
200
Sn (MVA)
(a)
Constante de tiempo térmico
40
30
20
0 200 400 600 800 1,000
Momento de inercia, GD2 (tm2)
(c)
Masa de cobre
32,458
24,000
12,000
0 200 400 600 800 1,000
Momento de inercia, GD2 (tm2)
(c)
22,000
12,000
100
200
Sn (MVA)
(d)
figura 6. Características térmicas de los sistemas de cinco máquinas de generación hidroeléctrica que se presentan en la
tabla 5.
noviembre/diciembre 2022
ieee power & energy magazine
85
300
400
5
300
400
10,000
5,000
100
200
Sn (MVA)
(b)
Constante de tiempo térmico
300
400
Estator
Inercia térmica (masa)
100
200
Sn (MVA)
(d)
Masa de cobre
300
400
mr (Cu) (kg)
Tr (min.)
Cpr (Cu) (kWs/K)
ms (Cu) [kg]
Cpr (Cu) (kWs/K)
Tr (min.)

IEEE Power & Energy Magazine - Spanish - November/December 2022

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - Spanish - November/December 2022

Contents
IEEE Power & Energy Magazine - Spanish - November/December 2022 - Cover1
IEEE Power & Energy Magazine - Spanish - November/December 2022 - Cover2
IEEE Power & Energy Magazine - Spanish - November/December 2022 - Contents
IEEE Power & Energy Magazine - Spanish - November/December 2022 - 2
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IEEE Power & Energy Magazine - Spanish - November/December 2022 - Cover3
IEEE Power & Energy Magazine - Spanish - November/December 2022 - Cover4
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