OLTC Compartment DGA Interpreter
IEEE C57.104 dissolved-gas screening with key-gas fault pattern for a OLTC compartment.
Tap-changer compartments generate arc gases by design — the diagnostic question is abnormal versus normal-for-OLTC. Compare the ethylene/acetylene balance: rising ethylene against the historic ratio signals coking contacts ahead of the service counter.
IEEE C57.104 Condition-1 screening with key-gas pattern matching for this OLTC compartment. Any acetylene above ~1 ppm deserves attention — it only forms in arcs. Trends beat absolutes: resample in 30 days; doubling gas is an active fault regardless of level.
Planning estimate only — interconnection, protection settings and compliance must be reviewed and signed off by a licensed electrical engineer and your utility before energisation.
Use the free OLTC Compartment DGA Interpreter online — IEEE C57.104 dissolved-gas screening with key-gas fault pattern for a OLTC compartment. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About OLTC Compartment DGA Interpreter
Tap-changer compartments generate arc gases by design — the diagnostic question is abnormal versus normal-for-OLTC. Compare the ethylene/acetylene balance: rising ethylene against the historic ratio signals coking contacts ahead of the service counter.
How to use OLTC Compartment DGA Interpreter
- 1Paste the six gas concentrations from the DGA lab report.
- 2Read the condition verdict and the key-gas fault pattern.
- 3Resample per the guidance — doubling gas is an active fault.
Why use OLTC Compartment DGA Interpreter?
- ✓IEEE C57.104 Condition-1 limits with automatic verdicts
- ✓Key-gas pattern matching names the likely fault type
- ✓Acetylene alarm logic — the gas that only means trouble
- ✓Trend guidance: rate-of-change beats absolute levels
Frequently asked questions
What does dissolved gas analysis tell you about a transformer?+
Oil dissolves the gases faults generate, each fault type with a signature: hydrogen from partial discharge, ethylene from hot metal, acetylene only from arcing, CO from cooking paper. A ₹5,000 oil test reads the transformer's internal health without opening it — the cheapest diagnostics in the substation.
Which DGA result demands immediate action?+
Acetylene above ~1–2 ppm, or any gas doubling between samples. Acetylene forms only above ~700°C — essentially arcing — and an active arc escalates on its own schedule, not yours. The screening verdict here flags it red; respond with resampling, loading review and expert analysis.
How often should transformer oil be tested?+
Annually for distribution and healthy power transformers; quarterly to monthly once any gas trends upward; immediately after through-faults, alarms or relay operations. The trend is the diagnosis — single samples only screen, which is exactly what this tool does.
Can this screening replace lab Duval-triangle analysis?+
No — it's the first read, applying C57.104 limits and key-gas heuristics to flag what deserves expert attention. Duval triangles, ratio methods and gassing-rate analysis on accredited lab data make the formal diagnosis. Screen here, escalate with confidence.
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