Power Transformer Testing & Commissioning Guide
Routine, type and site tests explained in plain language — insulation resistance, turns ratio, winding resistance, vector group checks, oil testing and safe energisation, step by step.
Start here: the most useful pages on LOTICI
Transformer Calculators
Three working calculators: convert three-phase kVA to amps (and back), check transformer load percentage, and calculate turns ratio and secondary voltage. No sign-up, instant results.
Electrical Test Tools Buying Guide
How to choose a multimeter, clamp meter, insulation tester and thermal camera — safety categories (CAT III / CAT IV) explained, and what genuinely matters for field work.
AI Tools for Electrical Engineers
Practical, honest ways engineers use AI today: drafting test reports, checking calculations, summarising standards and turning site notes into clean documentation.
Latest guides
Transformer Oil Testing Explained
Breakdown voltage, moisture, acidity and dissolved gas analysis: what each oil test measures, what the results mean, and when to act before a failure.
Insulation Resistance & PI Test, Step by Step
Setup, safety, connections, readings at 15 seconds, 60 seconds and 10 minutes, temperature correction, and how to interpret polarization index values.
Transformer Vector Groups Explained
What Dyn11, YNd11 and other clock numbers mean, why phase displacement matters, and the four rules for safe parallel operation.
Best Clamp Meters for Electricians
A criteria-based buying guide with no fake reviews: AC/DC, True RMS, jaw size, CAT safety ratings and inrush, plus a checklist to take to the shop.
Why engineers trust LOTICI
LOTICI is written by Abdul Wadood, an electrical site engineer whose day job is power transformer execution — installation, testing and commissioning of large transformers and high-voltage substation equipment in Saudi Arabia. Nothing here is copied from a catalogue: every guide is written the way the work is actually done on site, with the safety checks a competent person performs before energising equipment.
The companion YouTube channel, Volt & Coil, turns the same topics into visual explainers — watch at youtube.com/@voltandcoil and then come back here for the written transformer testing and commissioning guide and the online electrical calculators you can use on your phone at site.
Frequently asked questions
What is LOTICI?
LOTICI is an electrical engineering, AI tools and product lab run by electrical site engineer Abdul Wadood. It publishes free transformer testing guides, online electrical calculators, honest test-tool buying guides and practical AI workflows for engineers.
Are the transformer calculators free to use?
Yes. The three-phase kVA to amps calculator, transformer load percentage calculator and turns ratio calculator on LOTICI are completely free and run instantly in your browser with no sign-up.
Who writes the guides on LOTICI?
The guides are written from the field experience of Abdul Wadood, an electrical site engineer with more than eight years of work on power transformers, substation testing and commissioning in Saudi Arabia.
Latest thinking: AI on site
AI will not terminate a cable or torque a busbar connection for you — but it already drafts the report afterwards in a fraction of the time. Our guide to AI tools for electrical and site engineers shows realistic workflows, where AI helps, and where a qualified engineer must always verify the output before it goes into a signed document.