Monitoramento abrangente do estado dos transformadores: temperatura, DGA, descargas parciais e avaliação da integridade dos ativos | WhatsApp: +86 13599070393 | E-mail: [email protected]

Aplicações — Monitoramento de transformadores

Monitoramento de transformadores em subestações

Continuous monitoring of critical substation transformers across temperature, dissolved gases, partial discharge, bushings, OLTC, oil-system conditions and cooling performance.

Por que isso é importante

Why Continuous Monitoring Matters in Substations

Substation transformers operate under continuous loading with limited tolerance for unplanned outages, so their condition needs to be visible at all times — not just during scheduled visits.

  • ●Continuous loading
  • ●Estresse térmico
  • ●Envelhecimento do isolamento
  • ●Internal faults
  • ●Degradação por resfriamento
  • ●Deterioração da bucha
  • ●OLTC abnormalities
  • ●Remote / unattended substations

Periodic inspection provides only a snapshot, while online monitoring provides condition trends between inspections — see the broader picture in Monitoramento de transformadores de potência.

What Should Be Monitored on a Substation Transformer
Escopo do monitoramento

What Should Be Monitored on a Substation Transformer?

  • ●Winding & Temperature — hot spot temperature, oil temperature, cooling performance.
  • ●Óleo para transformadores — dissolved gas analysis, oil condition.
  • ●Isolamento — partial discharge.
  • ●Buchas — insulation condition.
  • ●OLTC — operating condition.
  • ●Tanque e acessórios — oil level, pressure, fans / pumps.
Monitor Thermal Stress Under Real Operating Load
Condição térmica

Monitor Thermal Stress Under Real Operating Load

Substation transformers can experience varying and sometimes high load conditions, making direct visibility into thermal behavior important for condition assessment.

  • ●Pontos críticos de enrolamento
  • ●Temperatura máxima do óleo
  • ●Aumento de temperatura relacionado à carga
  • ●Resposta de resfriamento
  • ●Temperature trends
Provas químicas

Dissolved Gas Monitoring for Developing Internal Faults

Changes in dissolved gas trends can provide chemical evidence of developing conditions inside an oil-filled substation transformer.

  • ●Superaquecimento interno
  • ●Descarga elétrica
  • ●Decomposição do isolamento
  • ●Tendências de evolução das falhas
Dissolved Gas Monitoring for Developing Internal Faults
Partial Discharge Monitoring for Insulation Risk
Provas elétricas

Partial Discharge Monitoring for Insulation Risk

Partial discharge activity can be associated with developing insulation defects inside the transformer's high-voltage structures.

  • ●Defeitos no isolamento em fase de desenvolvimento
  • ●Discharge trends
  • ●Early abnormality indication
  • ●Avaliação do estado
Componentes essenciais

Monitor Critical Transformer Components

Bushings and on-load tap changers can develop condition changes independently from the transformer winding and oil system. Dedicated online monitoring gives maintenance teams continuous trend information between scheduled inspections.

Transformer bushing condition monitoring in a substation

Monitoramento de buchas

Online bushing monitoring provides continuous visibility into high-voltage bushing insulation condition and helps identify developing electrical abnormalities between scheduled inspections.

  • Capacitance and dielectric-condition trends
  • Leakage-current monitoring
  • Phase comparison and long-term trend review
  • Monitoring-tap signal acquisition where applicable
Transformer OLTC online monitoring system

Monitoramento do OLTC

Online OLTC monitoring tracks tap-changer operating behavior and helps identify developing mechanical or electrical abnormalities during repeated switching operations.

  • Motor-drive current and operating behavior
  • Tap position and switching history
  • Operation count and condition trends
  • Temperature, vibration or timing information where configured
Oil System Condition

Oil Temperature, Level & Pressure Monitoring

For oil-immersed substation transformers, these three parameters provide a compact view of oil-system and tank operating condition.

  • ●Temperatura do óleo — supports thermal-condition and cooling-performance assessment.
  • ●Nível de óleo — helps identify abnormal oil-volume changes, oil loss or leakage.
  • ●Pressão — provides additional indication of abnormal tank or oil-system pressure conditions.

The integrated monitoring device combines oil temperature, oil level and pressure measurement in one unit for transformer condition monitoring.

Transformer oil temperature, oil level and pressure monitoring system
Avaliação Combinada

From Abnormal Signal to Maintenance Attention

Condição observadaPossível preocupaçãoMonitoramento relevante
Aumento da temperatura do enrolamentoMay indicate a thermal or cooling issueMonitoramento de temperatura
Abnormal gas trendCan help identify a developing internal faultDGA
Increasing partial dischargeMay indicate an insulation abnormalityMonitoramento de PD
Bushing condition changeSupports assessment of insulation deteriorationMonitoramento de buchas
Anomalia do OLTCPode indicar um problema mecânico ou elétricoMonitoramento do OLTC
Oil level / pressure abnormalitySupports assessment of an oil-system concernOil Level / Pressure Monitoring

Os sinais isolados contribuem para a avaliação do quadro clínico; devem ser interpretados em conjunto, e não como um diagnóstico por si só.

Arquitetura

From Field Sensors to the Substation Control System

Bringing every monitored parameter into one centralized view is what separates substation-level monitoring from single-transformer monitoring.

Transformador de subestação
→
Temperatura
DGA
Descarga parcial
Buchas
OLTC
Nível de óleo / Pressão
Resfriamento
→
Monitoring / Data Acquisition
→
Gateway / Communication
→
SCADA / Centro de Controle / Monitoramento Remoto
  • ●Centralized alarms
  • ●Historical trends
  • ●Remote visibility
  • ●Multi-parameter condition review
Visibility

Local Alarms and Remote Condition Visibility

Local Monitoring

  • ●Exibição local
  • ●Alarme
  • ●Status do resfriamento

Monitoramento remoto

  • ●Centralized alarms
  • ●Historical trends
  • ●Supervisão remota
  • ●Maintenance planning

Condition monitoring does not replace transformer protection.

Scale

Monitoring One Transformer or Multiple Substation Assets

Single Critical Transformer

A focused monitoring configuration built around one high-value or high-risk substation transformer.

Multiple Transformer Monitoring

A centralized configuration covering several transformers within the same substation under one monitoring and alarm view.

Monitoring architecture can scale according to transformer quantity and monitoring requirements.

Where It's Used

Typical Substation Monitoring Applications

Transmission Substations
High-voltage substations where transformer availability is critical to grid reliability.

Distribution Substations
Substations supplying end users, where continuous condition visibility supports service reliability.

Remote / Unattended Substations
Sites without permanent on-site staff, where remote monitoring is especially valuable.

Renewable Energy Substations
Substations serving wind, solar or other renewable generation with variable loading patterns.

Substation transformer monitoring supports asset visibility across Subestações and the wider Rede Elétrica e Serviços Públicos sector.

Planejamento

New Substation Project or Existing Transformer Retrofit?

Novo projeto

  • ●Plan monitoring points
  • ●Selecionar funções de monitoramento
  • ●Plan SCADA integration

Modernização

  • ●Analisar os sensores existentes
  • ●Reuse suitable instruments
  • ●Add monitoring functions
  • ●Integrate existing systems where feasible
Informações sobre o projeto

What Information Helps Us Recommend a Monitoring Configuration?

Informações sobre o transformador

  • ●Tipo de transformador
  • ●Potência nominal
  • ●Nível de tensão
  • ●Quantity

Existing Equipment

  • ●Sensores existentes
  • ●Dispositivos de monitoramento existentes
  • ●Sistema SCADA existente

Requisito de monitoramento

  • ●Parâmetros de monitoramento obrigatórios
  • ●Novo projeto ou reforma
Perguntas frequentes

Perguntas frequentes

What should be monitored on a substation transformer?

Typical parameters include winding and oil temperature, dissolved gases, partial discharge, bushing condition, OLTC condition, and oil level / pressure / cooling status.

Which parameters are most important for online monitoring?

This depends on transformer criticality, age and known concerns — critical or aging substation transformers generally benefit from broader parameter coverage.

What is the difference between protection and condition monitoring?

Protection systems act to isolate a transformer during a fault, while condition monitoring tracks ongoing trends to support maintenance planning — condition monitoring does not replace protection.

Can DGA and PD monitoring be used together?

Yes — they provide complementary chemical and electrical evidence and are often used together for a fuller condition picture.

Why monitor bushings and OLTC?

Ambos são componentes essenciais que podem apresentar problemas independentemente do isolamento do enrolamento principal; por isso, é recomendável que sejam monitorados separadamente.

Os sensores de transformador já existentes podem ser reutilizados?

In many retrofit cases yes, depending on sensor type, condition and compatibility with the monitoring system.

Os dados de monitoramento podem ser conectados ao SCADA?

Monitoring data can generally be made available to a substation SCADA or control system as part of the overall monitoring architecture; specific integration details depend on the project.

Todos os transformadores exigem a mesma configuração de monitoramento?

No — the appropriate configuration depends on transformer type, criticality, operating history and site requirements.

Build the Right Monitoring Architecture for Your Substation Transformers

Send us your transformer type, quantity, existing sensors and monitoring requirements to evaluate the right configuration for your substation.

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