Category Technical FAQs

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.

Discover the essential circuit breaker testing methods to ensure electrical safety and system reliability. Learn about mechanical timing, DRM, coil current profiling, and specific SF6 or vacuum breaker diagnostics.

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.

Discover advanced static electric motor analyzers for testing motors, generators, coils, and windings. Improve reliability with insulation resistance, surge, and partial discharge testing to detect early faults, reduce downtime, and support predictive maintenance in industrial applications.

Learn how surge and lightning arresters protect power systems from overvoltage. Discover working principles, MOV technology, arrester types, and key testing methods including insulation resistance, power factor, and V-I testing.

Learn what winding resistance testing is, why it is important for transformers, and how to ensure accurate and safe test results. Understand common faults and best practices.

Learn what motor inrush current is, why it occurs during startup, its impact on electrical systems, and how to reduce it using soft starters and VSDs.

Learn the basics of VLF cable testing, its origins, and how it improves cable insulation diagnostics. Explore VLF withstand testing, PD detection, and tan delta analysis for reliable power cable maintenance.