What this site is
I'm a senior SCADA engineer working utility-scale solar in Texas. Day job: PPC and RTAC programming, DNP3 and Modbus telemetry, substation communications, and the 2 AM calls when a plant drops off the utility's screen.
TelemetryLoop is my field notebook, cleaned up and published. Every article comes from work on real plants. Where an article depends on a specific software version, it says what it was verified against — and when a vendor changes something, I update the page or mark it.
What it isn't
Nothing here is vendor-sponsored. When I recommend the SEL RTAC or a MOXA box, it's because that's what I'd put in the panel, not because anyone paid for the sentence. Any affiliate links (book recommendations) are marked as such.
This site is reference material, not engineering services. Verify anything you take from here against your own plant's documentation, interconnect agreement, and safety procedures before acting on it. Working around energized equipment kills people who skip steps — nothing on this site replaces your site's LOTO, arc flash, and switching procedures.
Sign convention used on this site
Unless a page says otherwise: Q positive = plant injecting VARs (overexcited — raises POI voltage). Q negative = plant absorbing VARs (underexcited — lowers POI voltage). Your utility, your inverter vendor, and IEC-convention meters may define it the opposite way. Validate against a known operating state before trusting any signed Q from any device.
Corrections
Found a mistake? I want to know. Corrections and war stories: contact@telemetryloop.com.