Cap 5.2 VA

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Características Principais
 Uso interno
 Meio de extinção a vácuo
 Acionamento extremamente simples
Dimensões reduzidas
 Longo período sem manutenção
 Longa duração
 Grande número de manobras
Polo
Carcaça
Isolador
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Mercado dos diversos tipos de disjuntores
o
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Generalidades	
Enquadram-se nas normas:
IEC - 56
ABNT NBR 7118
VDE 0670
ANSI C37.06
NEMA Standart Publication No SG4
Temperatura do ar ambiente:
Máxima				40ºC
Média durante 24 horas		35ºC
Mínima				-5ºC
Ambiente não poluído por gases corrosivos, vapores ou salinidade
Altitude máxima de instalação	1000m acima do nível do mar
Ambientes sem condensação de umidade
Manobras de isolação
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Definições
Características nominais 
Tensão nominal – é a tensão máxima de operação do sistema para qual o disjuntor é previsto
Corrente nominal – é a corrente que o disjuntor conduz em regime permanente, sem aquecer demasiadamente os contatos e as partes condutoras
Freqüência nominal
Características de interrupção
Capacidade de estabelecimento
Capacidade de interrupção em curto circuito
Corrente suportável em 3s
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Definições
Tensões de serviço simétrico e assimétrico – a relação entre as capacidades assimétrica e simétrica de interrupção depende do tempo de abertura do disjuntor mais um tempo mínimo para operação do relé
Tempos
Abertura
Fechamento
Arco
Interrupção
Duração mínima do comando
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Tempos
Início do processo de abertura
Instante em que o circuito de disparo é acionado
Abertura completa dos contatos
Instante de extinção final do arco em todos os polos
Fechamento dos contatos principais
Tempo de interrupção
Tempo de retardo
Tempo de abertura
dos contatos
Tempo de arco
Tempo de religamento
Tempo de abertura
Tempo total de interrupção
Unidade de operação
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Nomenclatura
VA 8012/17
		 Tensão máxima do disjuntor - 17 kV
		 
		 Corrente nominal - 1250 A
		 
		
Capacidade de estabelecimento - 80 kA
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Características Técnicas
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Detalhes do polo
1 - Isolador superior
2 - Tirante Posterior
3 - Haste Telescópica com mola de contato móvel
4 - Haste de operação (ou haste de transmissão)
5 - Alavanca de operação
6 - Indicador mecânico de desgaste dos contatos
7 - Alavanca de transmissão
8 - Alavanca pendular
9 - Suporte de contato inferior
10 - Contato com segmentos (Contato Leopoldo)
11 - Cilindro de cerâmica
12 - Foles de metal
13 - Contato móvel
14 - Contato fixo
15 - Tirante Frontal
16 - Terminal Superior
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Funcionamento
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Acionamento
1-Disparador de Abertura
2-Disparador de Fechamento
3-Motor
4-Contatos auxiliares
5-Régua de bornes
6-Contador de manobras
7-Mecanismo indicador
8-Encaixe da manivela para acionamento manual
9-Atuação da botoeira de abertura
10-Atuação da botoeira de fechamento
11-Botoeira de abertura
12-Botoeira de fechamento
13-Manivela para acionamento manual
14-Visor com indicação do estado do disjuntor : aberto, fechado, carregado e descarregado.
15-Placa de características
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Funcionamento do Acionamento
1. Eixo principal
2. Mola de abertura
3. Mola de fechamento
4. Eixo para acionamento manual
5. Transmissão
6. Eixo de acionamento
7. Botoeira de fechamento
8. Botoeira de abertura 
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Acessórios opcionais
Disparador de abertura em derivação
Disparador de subtensão (relé de mínima)
Disparador de abertura energizada por capacitor (trip-capacitivo
Disparador de fechamento em derivação
Contatos auxiliares
Acionamento motorizado
Contador de operações mecânico
Sistema antipumping
Suporte com rodas e trilhos
Carrinho extraível
Quadro mural
Intertravamento Kirk
Relés de máxima primários
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Aterramento
Abaixo do suporte do isolador inferior encontra-se o parafuso de aterramento devidamente identificado com o sinal |||, que deverá ser necessariamente conectado ao aterramento da instalação.
Se o disjuntor estiver montado sobre um carrinho extraível, o aterramento se efetua automaticamente através de uma lâmina condutora que desliza sobre os trilhos.
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Providências a tomar antes da colocação em serviço
- Verificar se o disjuntor não sofreu danos externamente.
- Verificar se os parafusos de fixação do disjuntor estão apertados .
- Verificar com dinamômetro o torque de aperto dos parafusos de fixação dos barramentos ou conectores.
- Verificar se os barramentos não transmitem esforços mecânicos sobre os pólos.
- Reapertar o parafuso de aterramento.
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Providências a tomar antes da colocação em serviço
- Energizar o disparador de sub-tensão (relê de mínima), se for o caso.
- Efetuar operação de teste 
- Carregar manualmente a mola de fechamento e acionar a botoeira “FECHAR” e “ABRIR”.
- Observar mecanismo indicador em cada posição.
- Testar a função dos acessórios (vide “Operação”, próxima transparência).
- Conectar a tensão de comando. Energizar os disparadores para testar seu funcionamento.
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Providências a tomar antes da colocação em serviço
- Observar o mecanismo indicador.
Em todos os serviços devem ser obedecidas rigorosamente as normas de segurança correspondentes.
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Detalhes do polo
Eixo de
fixação
Invólucro
Superfície de contato
Contatos
Blindagem
Isolador de cerâmica
Fole de metal
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Princípio de extinção do arco
 Ao iniciar a abertura dos contatos, se estabelece uma descarga em forma de vapor metálico. A corrente flui através deste plasma até a próxima passagem por zero. O arco se extingue.
Na fabricação a pressão é de 10-9 mbar
Funcionamento - pressão menor que 10-4 mbar
Medidor de pressão da câmara tipo VT60
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Ensaios
Rotina
São realizados em nossa fábrica, em todos os nossos disjuntores, os ensaios de rotina conforme prescrevem as normas ABNT NBR 7118 e IEC 56
Tipo
Mecânico
Tempo de abertura e fechamento
Características do movimento
Mecanismo de proteção
Elétrico
Suportabilidade dielétrica
Condições de corrente e resistência
 
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Manutenção
 Após 5 anos ou 10.000 operações 	
	
 Após 30.000 operações		
	
Controle do desgaste dos contatos 
 Verificação de deposição de pó		
- Lubrificação dos polos e do comando
- Trocar a câmara de vácuo
- Quando os contatos atingirem o limite de desgaste, a câmara deverá ser trocada
- Em intervalos de pelo menos um ano, dependendo do ambiente.
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Medidas de segurança
A manutenção deverá ser realizada por profissionais com conhecimento em disjuntores, acionamentos e cabines elétricas.
Para trabalhar no disjuntor, o mesmo deverá estar na posição ABERTA, e as molas deverão estar DESCARREGADAS. 
- Desligar energia auxiliar externa.
- Pressionar as botoeiras de comando na sequência: FECHAMENTO e ABERTURA.
- Após os serviços de manutenção, operar o disjuntor desenergizado na sequência FECHAMENTO e ABERTURA.
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Controle do desgaste dos contatos
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Número de aberturas admissível
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