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.