Renewable Energy Transformer DGA Monitoring
Renewable energy transformers — in wind farms, solar PV plants, and battery energy storage systems (BESS) — face a fundamentally different stress profile than conventional utility transformers. Intermittent generation means daily 0–100% load cycling, inverter harmonics cause additional winding heating, and remote locations make manual oil sampling logistically difficult and expensive.
Wind Farm Transformers
Onshore Wind
Wind farm GSU transformers cycle daily with wind speed — often from 10% to 100% load in hours. Each thermal cycle mechanically stresses the winding insulation. Hydrogen monitoring with LoRa wireless is the standard solution: the DGA-200 mounts to the transformer, data transmits wirelessly to the O&M building, and trend analysis identifies accelerating gas generation before a fault forces a turbine outage.
Offshore Wind
Offshore substation transformers are the most expensive to monitor manually: a single technician visit costs $2,000–8,000 in crew vessel or helicopter transport, and weather windows may limit access to 6 months per year. Online DGA with wireless communication is not optional — it is the only economically viable monitoring strategy. Read the offshore wind case study →
Solar PV Plant Transformers
Utility-scale solar plants (100–500 MW) use multiple inverter transformers that operate only during daylight hours — experiencing a cold-start thermal cycle every single day. This daily expansion and contraction accelerates mechanical wear on winding insulation. The DGA-200 on each inverter transformer provides fleet-wide early warning at a per-unit cost that is viable even for 20+ transformer solar sites.
Battery Energy Storage (BESS)
BESS PCS (Power Conversion System) transformers experience bidirectional power flow and rapid mode transitions (charging ↔ discharging in seconds). The resulting harmonic content and frequent thermal transients create a unique DGA signature: elevated H₂ from partial discharge combined with cyclic ethylene/ethane patterns from thermal stress. The DGA-900 provides the multi-gas diagnostic capability needed to distinguish normal BESS cycling stress from a developing fault.