Power Systems

Transformer Primary & Secondary Protection based on National Electrical Code

Part of our job as an engineer is to check the design of other designers, engineers and of electrical product manufacturers. We call this QA/QC or Quality Assurance and Quality Control. Most companies have this system in place. It is a process to make sure that deliverables are thoroughly checked before they go for construction. […]

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Power Systems Protection & Control – The Anti-Pumping Relay Application

Background – The Anti-Pumping Relay Function In power systems protection, the control circuits of circuit breakers are designed in such a way to prevent the circuit breaker from closing and opening multiple times successively as it will damage the breaker closing mechanism.   Imagine this scenario, the operator turned the control switch in order to […]

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Effects of Harmonic Currents on Power System Part 2

Click on the Registration link for a Free Account so you can access training and videos as I add them as we go along. For those interested to get a copy of a Professional Electrical Engineer (Philippines) Technical Engineering Report HERE, login required to access.   This is the continuation of Part 1 where we […]

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Effects of Harmonic Currents on Power System Part 1

Click on the Registration link above for a Free Account so you can access training and videos as I add them as we go along. For those interested to get a copy of a Professional Electrical Engineer (Philippines) Technical Engineering Report HERE, login required to access. Introduction As an electrical practitioner or electrical engineering student, […]

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Transformer Vector Groups Basic Concepts – Part 2

Click on the Registration link above for a Free Account so you can access training and videos as I add them as we go along. In Part 1 (Click Here to read part Part 1), we laid out some basic concepts and background for transformer vector groups. We did some calculations to prove how the […]

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Transformer Vector Groups Basic Concepts – Part 1

Click on the Registration link above for a Free Account so you can access training and videos as I add them as we go along. Introduction The International Elctrotechnical Commission (IEC) has established a method of recognizing the configurations of high voltage and low voltage windings of transformers, called the Vector Group. In the most […]

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Figure-1: High Voltage Transmission and Distribution Electrical Diagram

Power Systems Protection Basic Principles

Click on the Registration link above for a Free Account so you can access training and videos as I add them as we go along. Power Systems Protection Criteria The three (3) basic criteria when designing protection schemes for power systems – Selectivity, Speed and Reliability. Selectivity is the ability of the protection scheme to […]

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