Substation Design

Practical Implementation of Transformer Winding Connections – 3 Critical Steps to Consider

Substation Design / By Aleen Mohammed / August 29, 2020 / 7 minutes of reading

To understand how transformer winding connections are made, in this article I will build a three-phase transformer delta-delta (with 180degree phase-shift) using three (3) single-phase transformers. Although this exercise seems moot for substation design, practical applications of single-phase transformers exist. For instance, as a station-service source. Also, to guide you step-by-step, I’ve prepared the below …

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Transformer winding connections using single phase transformers

Cheatsheet for calculating lightning surge arrester ratings

Substation Design / By Aleen Mohammed / June 12, 2020 / 5 minutes of reading

Are you sizing a lightning surge arrester for installation inside a substation? Electrical parameters: MCOV, TOV, and discharge voltage; should be on top of your list – for the correct application. If you are familiar with these parameters, then check out the below infographic, showing how to pick their values.

Easily correct phase shift on a delta-to-wye transformer for paralleling

Substation Design / By Aleen Mohammed / May 17, 2020 / 6 minutes of reading

Are you adding a new transformer, or perhaps replacing an existing one? Is the transformer’s phase shift different compared to another transformer in the same yard?
You need to get two things right when it’s time to parallel two transformers at a substation.

Changing A-B-C rotation to C-B-A? Don't do this.

Power Substation Design Calculations – A Checklist of 18 Studies for Engineers to Consider

Substation Design / By Aleen Mohammed / June 25, 2019 / 13 minutes of reading

What does it take to design a masterpiece of a substation? Quite a bit, honestly. In this article, I will share 18 design studies or calculations that will set you up to create a beautiful substation. Here’s the list.

Transient Recovery Voltage and Its Effect on a Circuit Breaker

Substation Design / By Aleen Mohammed / April 11, 2019 / 6 minutes of reading

One problem that is pervasive in the power grid and not well understood is called the Transient Recovery Voltage (TRV). When a short-circuit due to a fault in high voltage or medium voltage system is switched-out by a circuit breaker, the voltage across the breaker poles rapidly increases; as high as twice the operating voltage. …

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Practical Implementation of Transformer Winding Connections – 3 Critical Steps to Consider

Cheatsheet for calculating lightning surge arrester ratings

Easily correct phase shift on a delta-to-wye transformer for paralleling

Power Substation Design Calculations – A Checklist of 18 Studies for Engineers to Consider

Transient Recovery Voltage and Its Effect on a Circuit Breaker

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