Power Transformer DGA Monitoring for Utilities
For electric utilities, transformer failure is the highest-consequence equipment event on the network. A single transmission transformer failure costs $2–15 million in equipment replacement, environmental cleanup, and replacement power — and 12–18 months of lead time for a new unit. Online DGA monitoring is the most effective single technology for preventing catastrophic transformer failures.
Tiered Monitoring Strategy
A risk-based monitoring strategy aligns DGA capability with transformer criticality. The table below maps voltage class and MVA rating to the appropriate monitoring tier:
| Transformer Class | Voltage | Power Rating | Recommended Monitor | Gases |
|---|---|---|---|---|
| Tier 1: Critical | ≥220 kV | >200 MVA | DGA-900 Premium | 9 gases + moisture |
| Tier 2: Transmission | 110–220 kV | 50–200 MVA | DGA-900 Standard | 7–9 gases |
| Tier 3: Sub-Transmission | 33–110 kV | 10–50 MVA | DGA-200 | H₂ |
| Tier 4: Distribution | <33 kV | <10 MVA | DGA-500 | H₂ |
SCADA Integration
PAS DGA monitors communicate natively with utility SCADA infrastructure. The DGA-900 supports IEC 61850 Edition 3 (MMS and GOOSE) for modern digital substations, plus MODBUS RTU/TCP for legacy RTU integration. Alarm thresholds are user-configurable: a Level 2 alarm triggers a maintenance work order in the CMMS; a Level 4 alarm escalates directly to the control room operator.
Fleet-Wide Deployment
Utilities managing hundreds of transformers benefit from mixed-fleet monitoring: DGA-900 on GSU and transmission assets for full diagnostics; DGA-200 hydrogen monitors on distribution transformers for low-cost early warning. A single PAS Dashboard software instance manages the entire fleet, with automated reporting for regulatory compliance. The LoRa wireless option eliminates communication cable installation at remote substations, reducing per-site deployment cost by 60–80%.