Alstom GRID

Transformadores de TensinCapacitivo

Andr Fernando da Silva20/08/2012

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Agenda

1st topic Finalidad de un TPC Page 3

2nd topic Circuito equivalente y Clculo de los errores Page 12

3rd topic Tipos constructivos y partes constituyentes Page 16

4th topic Como especificar um TPC (Guia) Page 50

5th topic Accesorios y Conclusin Page 74

Transformadores de Potencial Capacitivo

Finalidad de un TPC

ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.

Definicin

Para facturacin de energa y proteccin en redes de alta tensin;

Aplicaciones de onda portadora (transmisin de datos utilizando la red elctrica).

Los Transformadores de Tensin Capacitivos (CVT ) son equipos cuya finalidad es reproducir en su circuito secundario una seal de tensin proporcional a la tensin del circuito primario.

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Histrico

En el pasado, divisores capacitivos eran utilizados para la obtencin de seales de tensin para sistemas indicativos y de sealizacin y de comunicacin a travs de la alta tensin.

Divisor de Potencial Capacitivo paraSistema de Indicao

Capacitor de Acoplamentopara Comunicao

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Histrico

Buscando el aumento de la potencia de la carga y una mejor precisin, el divisor de tensin capacitivo se desarrolla desde su forma mas simple hasta el actual transformador de tensin capacitivo (CVT).

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Ventajas

Ejecuta la funcin de dos equipos, un TP y un Condensador de Acoplamiento, economizando estructuras y consecuentemente espacio.

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Ventajas

Siendo utilizados para medicin o proteccin son mas econmicos que el TP para clases de tensin igual o superiores a 170kV, dependiendo de las caractersticas de precisin y carga.

Son equipados con accesorios de sistemas de ondas portadoras para seren usados en sistemas de comunicacin. Conocido como sistema OPLAT (onda portadora en linea de alta tensin), utiliza la liena de transmissin al invs de cables telefnicos para hacer comunicacin entre subestaciones.

Con base en el sistema OPLAT, permite la emissin y recepcin de voz, sinales elctricos para operaren equipamientos de telemetria, telecomando y proteccin.

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Desventajas

La respuesta del circuito secundario es mas lenta comparada al TP durante un cortocircuito secundario y cortocircuito primario.

No es aplicable para descarga de lnea en vacio, el TPC no es capable de disipar la energa, visto que seu primario es un capacitor y no una bobina de cobre como el TP convencional.

Desempeo en rgimen transitorio y en la ferroresonancia (ambos solucionados por dispositivos internos).

Si la respuesta transitoria requerida por la norma de fabricacin del CVT es suficiente para la actuacin correcta de los rels de proteccin, entonces los costos entre el CVT y el TP deben ser comparados.

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Transformador de Potencial Inductivo

Transformador de Potencial Capacitivo

P1

P2

S1

S2

P1

P2

S1

S2

Diferencia de circuito: TP x TPC

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CVT en el Sistema Elctrico

Deben ser conectados entre los dos puntos del circuito de transmisin donde har la comunicacin.

Transformadores de Potencial Capacitivo

Circuito equivalente y Clculo de los errores

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Circuito Equivalente del TPC

Uo

U2

Ls RsRpLp

RwL

C

a

r

g

a

Z

CE

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Rp = Resistencia primaria del TPI + resistencia representa pierdas en el hierro y cobre de la indutancia de ajuste LA + prdidas dielctricas de C1 y C2.

Lp = Inductancia de ajuste LA + Inductancia de fuga del primario del TPI

L = Inductancia equivalente a las perdidas dewattadas del circuito magntico del TPI

Rw = Resistencia equivalente a las perdidas wattadas del circuito equivalente del TPI

Ls = Inductancia de fuga del secundario del TPI

Rs = Resistencia del secundario del TPI

Z = Carga conectada en el secundario del TPC

Circuito Equivalente del TPC

ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subject to change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particular purpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.

Error de relacin:

Error de fase:

+=

sen

CLR

UP

eN

1cos.

.100% 22

Clculos de los errores

=

cos1..3438% 2

2min

eN CLRsen

UP

Transformadores de Potencial Capacitivo

Tipos constructivos y partes constituyentes

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Lnea de Productos

Transformadores de Potencial Capacitivos 72kV hasta 765kV OTCF

Condensadores de Acoplamiento 72kV hasta 765kV OCCF

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Caractersticas generales

Un: 72,5kV hasta 765kV;

Cn de 1750 hasta 37500pF;

Capacidad trmica hasta 1500VA;

Aislamiento en laminas de Al/pelicula de prolipropileno/papel kraft-aceite de alta calidad;

Excelente respuesta a transitorios;

Capacidad de resistencia ssmica;

Cumplimiento con IEC, ANSI/IEEE, NBR o normativas equivalentes;

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Tipos Constructivos

Hasta 170kV - 1 mdulo 245kV Un362kV - 2 mdulos

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Tipos Constructivos

420kV Un550kV - 3 mdulos

Los equipos de 765kV presentan 4 mdulos;

La utilizacin de mdulos es para hacer el transporte, los CVT son transportados en la posicin vertical;

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Tipos Constructivos

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Partes Constituyentes

Columna Capacitiva

TTI Inductivo

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Partes constituyentes

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Partes constituyentes

1- Terminal primario: 4 agujeros NEMA (aluminio fundido);

2- Cubierta del fuelle en aluminio fundido;

3- Fuelle de expansin en acero inoxidable, uno para cada modulo. Tienen la funcin de controlar la presin del aceite;

4- Resorte de compresin: sirve para dar resistencia mecnica a los pacotes dentro del aislador, para no alterar la capacitancia;

5- Conexin aislada de voltaje: Conecta el ultimo elemento al flange;

6- Elementos del capacitor: forman la columna capacitiva

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3- Fuelle de expansin

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6- Elementos del capacitor

Los elementos del capacitor tienen una mezcla de material dielctrico que consiste en capas alternadas de pelcula de polipropileno, lminas de aluminio y papel dielctrico kraft.

Las capas de papel kraft sirven como agente de succin para asegurar una impregnacin homognea del aceite sinttico;

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6- Elementos del capacitor

La relacin papel/pelcula/ lmina Al se determina cuidadosamente a fin de proporcionar una capacitanciaconstante para diferentes temperaturas;

Los elementos capacitivos estn conectados con laminillas de cobre estaado de baja inductancia;

2 eletrodos

dielectrico

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Los elementos son enrolados con precisin en mquinas controladas por microprocesadores.

6- Elementos del capacitor

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Elementos capacitivos individuales y uniformes que estn conectados en serieatravs de una laminilla de cobre estaado.

Una placa de carton prensado en cadaextremo sujeta todos los elementoscapacitivos. Luego se comprimehidrulicamente y se unen con cinta de fibra de vidrio epxica a fin de obtener el factor de espacio ptimo para los requisitos de capacitancia y circulacin del aceite.

Una placa de conexin ubicada en cada extremo se utiliza para mantener la continuidad entre cada agrupamiento capacitivo.

Contactos

Placa para sujetarPlaca de contacto

Elementocapacitivo

Cinta de fibra

de vidrio

6- Elementos del capacitor

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6- Elementos del capacitor

Los conjuntos de elementos capacitivos son presionados hidraulicamente y conectados con una fita de fibra de vidrio y resina epoxica.

Conectase el pasamuro fundido en resina epxica: permite la pasaje de tensin para alimentar el transformador

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Partes constituyentes

Es un divisor de tensin que proporciona un voltaje reducido en el pasamuro del TP intermedio para una determianda voltajeaplicada en el terminal primario;

Ofrecer un camio para el seal de alta frecuencia;

Es un paquete de unidades (elementos) mltiples de condensadores;

Cada paquete est alojado en un aislador individual;

Cada columna est hermticamente cerrada: fuelle de expansin;

Estn acopladas mecnicamente mediante un resorte de compresin en el topo de la columna y la conexin de tensin es hecha por los flanges;

Columna capacitiva

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Partes constituyentes

7- Aislador: porcelana o compuesto;

8- Conexin de la toma del divisor de tensin: 11/V3kV que alimenta el transformador dentro del tanque;

9- Pasamuro fundido en resina epoxica: permite la pasaje de tensin para alimentar el transformador;

10- Conexin de la terminal (HF) de alta frecuencia (caja sec.), en la parte final de la columna capacitiva;

11- Dispositivo de supresin de ferroresonancia;

12- Terminales secundarios;

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Partes constituyentes

13- Indicador de nivel de aceite ubicado en el tanque => proyecto standard;

14- Caja de terminales en aluminio;

15- Transformador intermedio;

16- Sellador de resina: aceite/aire;

17- Dispositivos de toma de muestras de aceite;

18- Reactor de compensacin;

19- Placa de cierre del tanque, donde est alojada la unidad electromagntica (UEM). El tanque est lleno de aceite y ubicado en la base de la columna capacitiva.

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Partes constituyentes

Los aceites aislantes utilizados presentan propiedades como: capacidad dielctrica, estabilidad contra el envejecimiento y absorcin de gases;

Unidades capacitivas: aceite sinttico SAS-60E (excelente propiedades para llegar a valores de Cn deseables) tiene propiedades superiores de absorcin de gases, lo que resulta en bajas descargas parciales con altos niveles de tensin de aparicin/extincin; Presenta baja viscosidad, mejor impregnacin; Aumenta Cn sin aumentar la columna cap.

Unidad electromagntica: aceite mineral naftnico Nitro 4000A,el mismo utilizados en los TCs y TPs.

Los aceites son libres de PCBs.

Aceite Aislante

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Partes constituyentes

Disminuye el voltaje intermediario proporcionado por el divisor de tensin a valores apropiados para aplicaciones de proteccin y medicin;

Se aloja en un tanque-base con tapa, ambos de aluminio fundido;

El tanque-base se llena con aceite mineral tratado y sellado hermticamente del aire ambiente y del aceite sinttico de las unidades del capacitor;

En la base del tanque hay un tapn de purga del aceite;

Unidad Electromagntica (UEM)

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Circuito Equivalente del CVT

1. Terminal primario;

2. Reactor de compensacin;

3. Transf. Voltaje intermedio;

4. Terminal de tierra;

5. Dispositivo de supresin de ferroresonancia;

6. Resistencia de amortiguamiento;

7. Terminal de onda portadora (AF);

8. Dispositivo de prot. sobretensiones;

9. Terminales secundarios;

10. Llave de aterramiento de pot., abrir en caso de prueba

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Esquema Electrico

1- Coluna Capacitiva2- Bobina de Drenagem3- Gap para proteo da bobina4- Chave de aterramento de Carrier5- Bobina de Bloqueio6- Chave de aterramento do Circuito Magntico7- Transformador de Potencial Indutivo8- Circuito de Amortecimento9- Reator de Compensao10- Gap para atuao do enrolamento auxiliar

R

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Accesorios para onda portadora (caja de terminales sec.)

Bobina de drenaje (2) hecha con nucleo y arrollamiento de cobre sirve para orientar el seal AF (sistema carrier);

La bobina es calculada para que junto con Cn del TPC, presente una atenuacin conforme norma de 3500V.

La llave de aterramiento del carrier (4) debe aterrar el sistemade carrier para manutencin o cuando este no estiver en operacin.

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2- Bobina de drenaje

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Accesorios para onda portadora (interior del tanque)

Bobina de bloqueo (5) debe bloquear el seal de alta frecuencia para tierra cuando el TP est aterrado y bloquear el seal de AF para el TP.

La llave de aterramiento del circuito magntico (6) sirve para aterrar la parte magntica para manuntencin o cuando esta no est siendo utilizada.

El TP (7) sirve para bajar la tensin intermediaria a valores normalizados, alimentar el circuito de supressin de ferroresonancia y aislamiento galvanico.

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8- Dispositivo de supresin de ferroresonancia

La capacitancia inerente y la unidad eletromagnctica con el ncleo de hierro exigen la supresin de ferroresonancia;

El DSF contiene un reactor saturable que actua como una llave,que presenta una impedancia muy alta en condiciones normales pero que activa un resistor de amortiguamiento en el secundario a un voltaje prescrito y desactiva la carga amortiguadora cuandoel voltaje se ha normalizado;

Un resistor es permanente, el otro es activado solamente cuando el reactor satura.

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8- Dispositivo de supresin de ferroresonancia

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9- Reactor de compensacin

Reactor de compensacin: reactancia en serie cancela el erro de fase producida durante la transformacin del voltaje en el divisor de tensin capacitivo; Tambin sirve para reducir los efectos transitorios.

Inductancia en fase con capacitancia equivalente del divisor capacitivo => Z=0

Un juego de tomas internas en el reactor y en el TPI son usados para los ajustes de precisin y ngulo de defasaje en fbrica.

La proteccin contra sobretensiones se logra mediante un explosor (gap) de proteccin (10) conectado en paralelo a las reactancias en serie.

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9- Reactor de compensacin

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Caja de terminales secundarias

Material: Aluminio fundido;

La zona de la caja se calienta por transferencia trmica del tanque lleno de aceite. Esto evita la condensacin en la caja terminal y elimina la necesidad de utilizar un calentador;

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Partes constituyentes

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Supresin del efecto corona

Para niveles de tensin iguales o superiores a 245kV, los TPCs son suministrados con un eletrodo de aluminio para garantizar la performance de aislamiento.

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Instalacin de Trampa de Onda en la partesuperior del CVT

Para verificar la posibilidad de instalacin de una Trampa de Onda la parte superior del CVT deben ser llevados en consideracin:

Las dimensiones de la Trampa de Onda (altura y dimetro);

Cuantas trampas de onda (1,2 o 3) sern instaladas, pues una presenta interferencia en la otra;

Velocidad del viento en el local de instalacin;

Sismicidad;

Mximo esfuerzo aplicado a los terminales de la Trampa de Onda

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Instalacin de Trampa de Onda en la partesuperior del CVT

Las trampas de onda sirven para direccionar el seal de un TPC para otro;

Para no dejar que el seal de alta frecuencia escape de la regin delimitada de comunicacin;

Es necesario suminsitrar una placa de adaptacin y retirar el terminal primario;

Transformadores de Potencial Capacitivo

Como especificar un TPC (Guia)

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Normas que se aplican

Niveles de aislamiento, frecuencia y Clase de Tensin;

Clase de precisin y Potencia Trmica;

Capacitancia y rango de frecuencia de Carrier (TPC)

Tensin primaria nominal y Factor de Tensin;

Calculo de los errores;

Ferro resonancia;

Respuesta al cortocircuito primario;

Ventajas y desventajas;

Gua de una especificacin

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1. IEC ( International Eletrotechnical Comission)

IEC 61869-1 Requisitos generales

IEC 61869-5 Capacitive Voltage Transformers

Sustitui IEC 60044-5/04 Capacitive Voltage Transformers

2. IEEE ( Institute of Electrical and Electronics Engineers)

IEEE C93.1/99 Coulpling Capacitor VoltageTransformers

Normas que se aplican

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La tensin mxima del equipo debe ser como mnimo, la tensin ms elevada del sistema dnde el CVT ser instalado y de acuerdo a la norma;

Niveles de aislamiento son valores estndar y deben ser definidos con base en la clase de tensin de servicio del circuito en el que el CVT ser instalado, y as representados:

NA: tensin soportable nominal a la frecuencia industrial/ tensin de choque de rayo/ tensin de impulso de maniobra*

* Establecido para tensin arriba de 245kV

Tensin mxima y niveles de aislamiento

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Segn Norma IEC-60044.5, valores en kV

Tensin mxima del equipo ( Um) Tensin soportable a la frecuencia industrial 1 min Tensin soportable de choque de rayo Tensin de impulso de maniobra

72.5 140 325 -

100 185 450 -

123185 450 -

230 550 -

145230 550 -

275 650 -

170275 650 -

325 750 -

245395 950 -

460 1050 -

300395 950 750

460 1050 850

362460 1050 850

510 1175 950

420570 1300 1050

630 1425 1050

525630 1425 1050

680 1550 1175

765880 1950 1425

975 2100 1550

Tensin mxima y niveles de aislamiento

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Segn Norma IEEE C93.1, valores en kV

Tensin mxima del equipo ( U

m)

Tensin soportable a la frecuencia industrial 1 min

Tensin soportable de choque de rayo

Tensin de impulso de maniobra

72.5 140 350 -

123185 450 -

230 550 -

145 275 650 -

170 325 750 -

245395 900 -

460 1050 -

362 575 1300 825

550750 1675 1175

800 1800 1175

800 920 2500 1425

Tensin mxima y niveles de aislamiento

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30VA, Cl 0,2 - cos =0,8 30VA = Potencia aparente nominal

CL 0,2 = Clase de precisin garantizada con 100% y 25% de la potencia nominal con 80% y 120% de la Vn.

Servicio de medicin IEC

Potencia y clase de precisin

0,3WXY - cos =0,9 WXY = Potencia aparente 75VA

0,3 = Clase de precisin garantizada con 90% hasta 110% de la tensin nominal con carga desde cero ( 0 ) hasta la carga nominal.

Servicio da medicin IEEE

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Servicio de medicin IEC

Potencia y clase de precisin

CLASE DE PRECISICLASE DE PRECISICLASE DE PRECISICLASE DE PRECISINNNN PorcentajePorcentajePorcentajePorcentaje del del del del errorerrorerrorerror

DefasajeDefasajeDefasajeDefasaje

MinutosMinutosMinutosMinutos CentiradianosCentiradianosCentiradianosCentiradianos

0.1 0.1 5 0.15

0.2 0.2 10 0.3

0.5 0.5 20 0.6

1.0 1.0 40 1.2

3.0 3.0 No especificado No especificado

El CVT de medicin debe mantener su precisin, con la frecuencia nominal, para tensiones entre 80% y 120% de la tensin nominal, con carga secundaria entre 25% y 100% de potencia secundaria nominal;

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0,30,6

Mnimo Mximo Mnimo Mximo0,9970,994

1.0030,988 1.0121.006

E rro re s de C orrie nte

C on 100% In y 110% Un C on 10% de Un

C L A SE DE

PREC IS IN

0,994 1.006

Servicio de medicin IEEE

Potencia y clase de precisin

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30VA, 3P - cos =0,8 El TPC tiene un error de tensin menor que 3% desde 5% hasta el factor de tensin nominal veces la tensin nominal. Con 2% de la tensin nominal el error debe ser dos veces el error nominal de la clase. Los errores deben ser mantenidos con 25% y 100% de la potencia nominal.

Servicio de la proteccin IEC

Potencia y clase de precisin

1,2R - WXY - cos =0,85Servicio de la proteccin IEEE

El TPC tiene un error de tensin menor que 1,2% desde 90% hasta 110% de la tensin nominal con la potencia nominal desde cero ( 0 ) hasta 75VA..

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Classe e Carga de Exatido

NormaVariaes da freqncia Variaes na

Temperatura AmbienteMedio Proteo

IEC 99 a 101% fN(59,4 a 60,6 Hz)96 a 102% fN

(57,6 a 61,2 Hz) -25 a +40C

ANSI No possui variao 58 a 62 Hz -40 a +45C

ABNT (Projeto)

99 a 101% fN59,4 a 60,6 Hz

97 a 103% fN58,2 a 61,8 Hz -5 a +40C

A Classe e a Carga de Exatido devem ser garantidas nas seguintes condies:

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Capacidad mxima

Factores de influencia en la capacidad mxima del equipo y consecuentemente el costo:

Clase y carga de precisin;

Factor de sobretensin;

Frecuencia;

Nmero de devanados secundarios;

Capacitancia nominal;

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Potencia Trmica

Es la potencia mxima que el TP debe soportar sin exceder el lmite de elevacin de temperatura de acuerdo a la norma a la cual ha sido especificado.

La clase de precisin no es garantizada para la potencia trmica.

La norma ABNT (Brasil) menciona como calcular la Pth:

...*)( 2 nompotmxFstPth =

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Capacitancia Nominal y Frecuencia de Carrier

Capacitancia nominal: es el valor nominal de la capacitancia de la columna.

l responsable por la eleccin de la capacitancia mnima del CVT es el Ingeniero de comunicaciones, ya que su inters es que la seal de CARRIER inyectado en el extremo de la lnea llegue con suficiente intensidad al otro extremo. Adems el rango de frecuencia que de acuerdo a la norma debe ser entre 30 y 532 kHz.

Capacitancia mnima para que las pierdas no influencien la comunicacin del sinal;

La perdida de la seal por insercin de la bobina de drenaje debe ser menor que 0,5dB;

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Capacitancia Nominal y Frecuencia de Carrier

Capacitancia nominal: cuanto > aislador; < capacitancia;

940041503150OTCF 300

4000--OTCF 765

540022501750OTCF 550

625027702100OTCF 420

810033502650OTCF 362

1125050003750OTCF 245

1620067005250OTCF 170

1880083006250OTCF 145

22500100007500OTCF 123

375001670012500OTCF 72.5

Capacitancia (pF)

ER,EMIR,II,IMSR,SI,SMTipo (Um(kV))

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Faja de Frecuencia de Comunicacin

Es el rango de frecuencia que ser utilizado para la comunicacin.

Se no especificado utilizase de 30 hasta 532kHz

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Tensin primaria-secundaria nominal y factor de tensin

La tensin primaria nominal debe ser la tensin nominal, entre fase y tierra, del sistema donde el equipo ser instalado.

69.000/3 / 115 3 V

138.000/ 3 / 110/ 3 V

230.000 3 / 115/1153 V

El factor de tensin debe ser especificado de acuerdo a la norma y las condiciones de puesta a tierra del local de instalacin del CVT.

IEC => 1,2Un continuo y 1,5Un por 30 segundos

IEEE => 1,1Un continuo y 1,4Un por 30 segundos

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Ejemplo de una especificacin

Transformador de Tensin Capacitivo 145kV, f=60Hz

Norma IEC 60044-5

138.000/3 - 115/115/3 (2x)

50VA, Cl 0.2, 50VA, CL 3P

Carga simultanea=100VA

FT - 1,2Un continuo y 1,5Un por 30 segundos

Pth=800VA (total), Cn=6300pF

Nivel de contaminacin: 25 mm/kV

Altitud: < 1000 msnm

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Rgimen Transitorio

Los CVT estn sometidos a dos condiciones de transitorio:

La Ferro Resonancia que aparece principalmente en la apertura de un cortocircuito secundario;

Al tiempo de recuperacin o respuesta a un Cortocircuito Primario;

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Rgimen Transitorio

La causa de las oscilaciones es debido al hecho del equipo ser constituido por elementos capacitivos, inductivos y resistivos.

Estas oscilaciones son inadmisibles, una vez que pueden ocasionar sobretensiones elevadas que pueden deteriorar el CVT y los equipos a l conectados.

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Efecto de la Ferro Resonancia

Ocurrido un cortocircuito secundario y estando el CVT energizado, el interruptor de proteccin del secundario acta eliminando este cortocircuito.

Despus del cambio de cierre del interruptor, toda la energa almacenada en los elementos capacitivos es bruscamente descargada, criando una corriente de circulacin en el primario del TP que se refleja en el secundario.

Esta energa se disipa haciendo el ncleo del TP y del reactor saturar, para eso sirve el circuito de supresin de Ferro resonancia.

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El producto de esta corriente por la impedancia primaria causa una sobretensin en la unidad electromagntica, haciendo con que las inductancias del TP satrense y el dispositivo de proteccin contra sobre tensiones acte.

Esto ocasiona oscilaciones en el circuito, que no desaparecen almenos que el CVT sea desconectado del sistema.

Para suprimir estas oscilaciones se coloca una impedancia de amortiguamiento de bajo valor, con la finalidad de disipar la energa almacenada, eliminando las oscilaciones y el efecto de la Ferro Resonancia.

Efecto de la Ferro Resonancia

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Efecto de la Ferro Resonancia

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Respuesta al Cortocircuito Primario

Presenta una respuesta menos rpida que los TPs, siendo importante hacer un estudio real del tiempo de respuesta necesario parael sistema de proteccin.

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Cortocircuito

Transformadores de Potencial Capacitivo

Accesorios

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Accesorios

Accesorios ya inclusos (standard)

Accesorios conforme solicitacin

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Accesorios ya incluidos

Indicador del nivel de aceite en la unidad electromagntica

Vlvula para retirada de muestra de aceite

Membrana metlica par expansin del aceite de la columna capacitiva (acero inoxidable)

Dispositivo para izamiento

Conector de puesta a la tierra

Terminal primario (4 agujeros NEMA Al)

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Accesorios ya incluidos

Caja de terminales secundarios

Placas de identificacin y diagramtico

Dispositivo contra sobre-tensiones en la unidad electromagntica

Llave de puesta a la tierra del TP

Dispositivo supresor de ferroresonancia

Bobina de drenaje, llave carrier, terminal HF (se no solicitados pueden ser sacados)

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Accesorios conforme solicitacin

Mini-interruptores de proteccin del secundario, con o sin contacto de alarme

Termostato

Caja secundaria bipartida con dispositivo para lacre de la caja secundaria

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Accesorios conforme solicitacin

Tipo de material del terminal primario

Agujeros para entrada de cables en la caja secundaria

Indicador de nivel de aceite para cada modulo capacitivo

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Accesorios conforme solicitacin

Pintura de las partes metlicas

Conector primario

Rango de cables para el conector de puesta a la tierra

Sub-base con entre-eje de fijacin especial

Adaptador para la Trampa de Onda (suministrado en sustitucin al terminal primario)

Transformadores de Potencial Capacitivo

Conclusin

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Aumento del Costo del equipo

Nmero de devanados

Clase e carga de precisin (individual y simultanea)

Capacitancia nominal

Condiciones especiales de instalacin

Accesorios extras

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Muchas Gracias!

Ing. Andr Fernando da Silva

Sales Specialist - AIS

Tel. 55 35 3629-7094

Fax:(35) 3629-7007

andre-fernando.silva@alstom.com