What is a transformer bushing current transformer (BCT)? Learn how BCTs protect power systems, why core saturation happens, and essential diagnostic testing methods.

Learn how variable frequency tan delta testing works, including NB DFR and dielectric frequency response (DFR) methods. Discover how these advanced insulation diagnostics improve moisture detection, temperature correction, and transformer condition assessment.

Learn what partial discharge is, how it damages electrical insulation, and why it is critical for asset reliability. Discover key testing methods, monitoring techniques, and how PD detection helps prevent costly failures in transformers, cables, and switchgear.

Learn how CCVTs work, their construction, and key field tests including insulation, capacitance, ratio, and dielectric diagnostics for reliable substation performance.

Learn how the IET Wiring Regulations (BS 7671) apply to loop impedance testing, including Zs limits, the 80% rule, RCD effects, and compliance requirements. A clear guide for electricians to ensure safe installations, accurate testing, and proper certification in modern electrical systems.