The In-Situ Temperature Indicating System

 The ChemTracer In-Situ Temperature Indicating System is a passive, patented indicator installed directly on load tap changer contacts. When a contact reaches a prescribed temperature, the indicator releases a proprietary chemical tracer into the insulating oil. The tracer is detectable at parts-per-billion levels in the routine dissolved gas analysis samples utilities already collect. No dedicated sensors, no wiring, no monitoring hardware, and nothing new to install in the substation. 

1. Install. The indicator mounts directly on the LTC contacts during a routine maintenance interval.
2. Operate. The transformer runs normally. The indicator sits passive until a contact reaches the prescribed temperature.
3. Detect. The released tracer appears in standard DGA oil sampling, telling you which unit needs attention and why.

 Industry research attributes roughly one third of transformer failures to load tap changers, and overheating contacts are a leading driver. With replacement transformers now carrying multi-year lead times and sharply higher costs, early warning at the component level is one of the highest-value interventions a utility can make. 

 A major Northeastern utility's internal business case identified $2.29 million per year in maintenance savings across its LTC fleet by moving from calendar-based to condition-based maintenance. Avoided failures add to that: a single prevented LTC failure can save the cost of a transformer. 

 The tracer-and-detection foundation was validated through research cosponsored by EPRI, progressing from bench testing through accelerated laboratory testing of roughly 60,000 switching operations to in-service installations, with field and laboratory programs spanning 16 utilities. The patented temperature-triggered indicator is the production evolution of that work, protected by five issued U.S. patents with terms extending to 2038.