Single Line Diagrams (SLDs) can look intimidating at first. Rows of switches, transformers, and feeder numbers fill a single sheet. But once you understand the logic behind the layout, an SLD tells a clear story. It shows how power comes in, how the system protects it, how transformers step it down, and how it finally…
Category: Electrical Courses
LV Panel Components: Switches, Relays & Meters
This is the fourth post in our LV Panel Engineering Series. The earlier posts cover the standards, construction, and enclosure design. This post looks at what actually sits inside the panel: the devices that switch power, control operation, and measure what’s happening on the system. Open any Main LV Board or MCC, and you’ll find…
HV Substation Construction Sequence: A Phase-by-Phase Guide
If you’ve ever read an SEC tender scope of work or a project schedule for a Bulk Supply Point (BSP), you’ll know the sequence looks deceptively simple on paper — engineering, civil, installation, testing, energization etc. In reality, the schedule that wins the tender & survives contact with the site are often two different documents….
Autotransformers in EHV Power Systems: Theory, Maths & Practice
Autotransformers are among the most misunderstood yet critically important assets in modern power systems. While they appear deceptively simple at low voltages, at EHV levels (380–500 kV) they become system-defining components that directly influence fault levels, insulation coordination, grounding, and grid stability. This article provides a complete, utility-grade explanation of autotransformers, covering theory, mathematics, IEC…
Feeder Protection Signaling
High-voltage power systems like 380kV transmission lines are the backbone of modern grids. They carry electricity over long distances, and any fault (like a short circuit or flashover) the system must detect it instantly and isolate it to protect equipment and keep the grid stable. That’s where feeder protection signaling comes in. In this post,…
Most Common Electrical engineering interview questions
in this post we are going to explain most Common Electrical engineering interview questions. The question here will focus on Overhead Power Transmission Lines. Following are some of the important and most Common Electrical engineering interview questions Why use high-voltage instead of low Voltage for transmission? The best answer to that question is that high-voltage…
Top software programs for Electrical Engineers
This unique post about Top software programs for Electrical Engineers is for those engineers who are seeking jobs in Saudi Arabia. Mastering key software tools can significantly boost their employability, especially in industries like power generation, transmission, oil & gas, and construction. Below is a list of the top software programs to focus on: 1. PLS-CADD…
Main Components of Substation-Power Transformers
In this series of Posts we are going to Explore Main Components of Substation. We will focus on a 380 kV substations or Bulk Supply Points (BSP) that are most common in Saudi Arabia. A substation is designed to manage the transmission and distribution of electrical power at high voltages. These include several key components…
Electrical Engineering Courses on Coursera
This Post is for Electrical Engineers who want to excel or become an Electrical Design Engineer, Site Engineer, Construction and Planning Engineer, Protection Engineer or Testing and Commissioning Engineer in Transmission, Distribution or Substation fields. Below is the list of Top and Best free Electrical Engineering Courses on Coursera. If you want to know how…