# Power System Fundamentals

Power system fundamentals covers short-circuit studies, load flow studies, arc flash studies etc. Articles here cover some of the basics too which are important if you want to understand some of these studies. The basics include per unit systems, symmetrical components, current ratings etc.

## Power Cable Neutral and System Grounding

Installing medium voltage power cables underground comes with its own set of challenges. From the engineering standpoint, there are several factors one needs to consider before installing the cable. The most overlooked if not well understood factor is the type of power cable that’s required for the application and when to ground the cable’s neutral …

## Why We Need Electrical Power Substations

We build substations for the following reasons: Practical Considerations To satisfy load growth When people or businesses move to a new location that has little to no power supply infrastructure, it might make a case for building a substation close to the community. Supplying this new load from distant substations is inefficient because a little …

## Determine How To Load Two Paralleled Transformers

The maximum load in kVA the transformers can supply (combined) without overloading any one , is determined by the transformers impedance. They load up inversely proportional to their impedance.

## Per Unit System – Practice Problem Solved For Easy Understanding

Let’s understand the concept of per unit system by solving an example. In the one-line diagram below, the impedance of various components in a power system, typically derived from their nameplates, are presented. The task now is to normalize these values using a common base.

## What Do Symmetrical, Asymmetrical, Momentary, Interrupting, Close & Latch Ratings Mean?

These terms were coined over a time period to identify the appropriate short circuit current magnitude that engineers could use to size the switchgears, switchboards, panelboards, and the circuit breakers.

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