Power transformers represent the single most expensive asset in substations. Online monitoring replaces periodic manual sampling with continuous sensors that detect incipient faults months before scheduled maintenance would find them.
Online DGA
Online DGA monitors use gas chromatography or photo-acoustic spectroscopy to measure hydrogen, acetylene, ethylene, methane, ethane, CO, and CO2 in real time. Hydrogen-online monitors provide early partial discharge or thermal fault warning. Multi-gas monitors enable Duval Triangle fault classification.
Bushing Monitoring
Bushing monitoring measures capacitance (C1) and power factor (tan delta) online. Capacitance change exceeding 10% or tan delta exceeding 0.7% indicates impending bushing failure—responsible for transformer catastrophic failures.
Equipment Integration
The Surge Arrester Monitor protects transformer bushings. The Smart Grid Platform aggregates all sensor data. The Cable Monitor monitors connected cable circuits. The Overhead Line Monitor monitors incoming lines. The Cable Current Monitor detects grounding issues.
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