Indepth Electrical engineering

  Importance of Checking Electrical Wires and Cables in Houses to Prevent Overheating and Fire Introduction Electricity powers our modern lives, but when neglected, it can also become one of the most silent and deadly hazards in our homes. Every year, thousands of house fires occur due to faulty or overheated electrical wires. According to the National Fire Protection Association (NFPA) , nearly 34% of residential fires worldwide are caused by electrical faults , with a major share linked to deteriorated or overloaded wiring. In India alone, the National Crime Records Bureau (NCRB) 2022 report recorded over 7,000 deaths annually from electrical short circuits and fires —most of which were preventable with timely wire inspections. This makes regular inspection of electrical wires and cables not just a recommendation but a life-saving necessity . In this article, we will explore why checking wires matters, the risks of negligence, practical methods to inspect cables, and real-w...

  🔧 Transformer Maintenance Values and Limits 1. Oil-Type Transformers A. Oil Testing Parameters Parameter Typical Limit / Value Notes Dielectric Strength ≥ 30 kV (1 mm gap) Below this, oil needs filtration or replacement Moisture Content ≤ 30 ppm (for new/healthy oil) Higher moisture → reduce insulation strength Dissolved Gas Analysis (DGA) Gas ratios per IEC standard (e.g., Rogers ratio, Doernenburg ratio) Used to detect overheating/arcing Acidity (Neutralization Number) ≤ 0.1 mg KOH/g Higher value indicates oil deterioration Interfacial Tension ≥ 40 mN/m Indicates presence of polar contaminants Flash Point ≥ 140°C Safety limit for oil B. Electrical Tests Test Typical Value / Limit...

  Transformer Nameplate Details: A Complete Guide for Engineers The nameplate of a transformer is often referred to as the “identity card” of the equipment. It carries critical information about the transformer’s design, performance, and operational limits. For engineers, operators, and maintenance teams, understanding these details is essential for safe operation, correct installation, and effective troubleshooting. In my 20+ years of working with transformers—ranging from distribution units in urban substations to large power transformers in industrial plants—I’ve seen how misinterpretation of nameplate data can lead to costly errors, system inefficiencies, and even equipment failures. This article provides a detailed explanation of transformer nameplate details , along with their significance. 1. Manufacturer Details Name of Manufacturer : Identifies the maker of the transformer. Crucial for spare parts, warranty, and service support. Serial Number : A uni...