Electrical Substations Guide & Maintenance | Fahad's Electrical Encyclopedia

75+ questions with short and professional answers across five categories — from fresh graduates to control & SCADA engineers.

Calculate the required capacitor bank size in kVAr to raise the power factor from its current value to the target value.

The companion section: 50 lessons on transformers, from fundamentals to testing and protection.

Introduction to Substations

Start here: what a substation is, its functional types, its components, and how to read its single-line diagram.

Air-insulated vs. gas-insulated substations: the full comparison and SF6 gas.

The concept of maintenance and its types, safety procedures, periodic inspections, and thermal imaging.

The function of capacitor banks, their maintenance, the golden discharge rule, and power factor improvement.

The purpose of earthing, its resistance, improvement, and measurement, and the difference between protective and neutral earthing.

The heart of medium-voltage distribution: cells, components, types, and the interlocking system.

Load-break switches, earthing switches, fuses, and the key difference from a circuit breaker.

Circuit breakers and their types, disconnectors, surge arresters, instrument transformers, and protection relays.

The brains of the operation: control rooms, control centers, SCADA, RTUs, and fault-handling scenarios.

Total blackouts and their causes, load shedding, and modern FACTS systems.

For those who want structured, step-by-step learning with videos and practical explanations.

Follow trainer Fahad Refai's Substations and Electrical Maintenance courses — a practical walkthrough from maintenance fundamentals to SCADA systems.