Category Technical FAQs

Learn what partial discharge testing is in transformers and high-voltage systems, how it improves power reliability, and where it is used in GIS, cables, and rotating machines. Discover PD measurement methods and commonly used diagnostic instruments.

Learn what low resistance testing is and how Kelvin four-wire measurement works. Discover how high test current, probe setup, temperature correction, and noise reduction improve micro-ohm accuracy in electrical systems, including cables, switchgear, and circuit breakers.

Learn how an insulation tester (Megger) works, including capacitive charging current, polarization current, surface leakage, and conduction current. Understand insulation resistance measurement, Ohm’s Law, and why timing and discharge are critical for accurate electrical testing.

Explore key stationary battery technologies including lead-acid, lithium-ion, flow batteries, sodium-ion, and nickel-based systems. Learn working principles, applications, advantages, disadvantages, and why battery testing is critical for reliable grid storage and renewable energy systems.

Explore the key challenges in testing converter and rectifier transformers on-site. Learn about vector group complexity, multi-tap phase shift variation, and modern TTR-based testing solutions used to improve accuracy and reduce manual errors in field diagnostics.

Understand how transformer phase shift is tested in special transformers. This guide explains measurement methods, vector groups like Dyn11, testing tools such as TTR analyzers, and how phase shift impacts harmonic performance in power systems.

Learn what transformer frequency response is and how SFRA testing detects winding deformation, core movement, and internal faults. Understand working principles, applications, and when to use frequency response analysis for transformer condition monitoring and maintenance.

Learn what on-site testing of special transformers means, including ratio test, vector group verification, and phase shift measurement. Understand why converter and rectifier transformers require advanced field testing for reliable performance and power quality assurance.

Learn how transformer oil Tan Delta (DDF) testing evaluates insulation health. Discover BDV, resistivity, moisture impact, high-temperature testing methods, and how to detect oil contamination early to prevent transformer failures.

Learn how surge testing detects early turn-to-turn insulation faults in electric motors. Discover Line-Line & Pulse-Pulse EAR methods, motor failure causes, and why surge testing is safe, non-destructive, and essential for predictive maintenance.

Discover how Narrow-Band DFR (Variable Frequency Tan Delta) improves transformer insulation testing. Learn how it detects hidden moisture, provides accurate temperature correction, and outperforms traditional power factor tests for early fault diagnosis.

Discover why testing self-powered protection relays can be tricky. Learn how non-linear loads and pre-fault conditions affect accuracy, and explore the best testing solutions for modern smart grids.