Section of Wrindu Knowledge include Products How-to Guides, Best Practices, Case Studies, Technical Articles and Products FAQs.
Learn about OLTC working principle, types, design, maintenance, and how Wrindu testers stand out for OLTC diagnostics. A complete engineering guide for power transformers.
Full transformer lifecycle guide to ratio testing: FAT, commissioning, annual maintenance, post-repair & pre-energization checks per IEC/IEEE standards.
Debunk top transformer ratio testing myths, clarify IEC/IEEE standards, avoid false failures and learn accurate testing best practices for field & factory.
Complete 2026 buying guide for portable transformer ratio testers: check accuracy, voltage range, IEC/IEEE compliance and features for field & factory use.
Fix transformer ratio test failures fast: learn top 7 causes (shorted turns, faulty tap changers) + actionable fixes to meet IEC & IEEE C57.12.90 standards.
Learn what transformer ratio testing is, its purpose, how it works, key IEC/IEEE standards and critical testing best practices for all transformers.
Follow this step-by-step transformer ratio testing guide for field & factory use, covering prep, wiring, OLTC testing, data logging and IEC/IEEE compliance.
2026 updated IEC 60076-1 and IEEE C57.12.90 standards for transformer ratio testing, ±0.5% tolerance, test procedures & compliant portable test kits.
Learn the key differences between transformer turns ratio and voltage ratio, master accurate testing per IEC 60076-1 & IEEE standards, and avoid common measurement errors.
Learn how CT testers verify current transformer accuracy, ratio error & polarity. Comply with IEC/IEEE standards for grid safety, metering & relay protection.
Learn how to repair transformers effectively, diagnose faults, use proper testing tools and maintain equipment to boost longevity and avoid costly outages.
Complete guide to measuring winding resistance for China-based OEMs: 4-wire Kelvin method, temp compensation, QA standards and factory testing best practices.
