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ETT Study Guide Book 2: Fundamentals and Theory

H. System Tests Analysis and Operation

1. Electrical Drawings and Diagrams

Electrical diagrams are drawings which are used to represent electrical circuits, these circuits are represented by using lines, symbols, and number combinations. Electrical diagrams show the wiring between components and the relative position of the components.

Demonstrate understanding of electrical one-line diagrams 2

Interpret electrical one-line diagrams 3, 4

Interpret ac and dc schematic diagrams, ac three-line diagrams, and connection and interconnection drawings 2, 3, 4

Identify electrical symbols and ANSI device numbers 2, 3, 4

Interpret time-current curves 2, 3, 4

2. Power System Studies

Power system studies are essential tools in understanding the expected performance of an electrical system and determining the severity of a fault or other unexpected event. The data contained within a power system study can be used to safeguard workers by calculating the level of personal protective equipment involved and reduce damage to equipment by optimizing the fault clearing capabilities of protective devices.

Recognize essential components of short-circuit and coordination studies 2, 3, 4

Demonstrate basic understanding of short-circuit and coordination studies 2

Apply data extracted from short-circuit and coordination studies 3, 4

3. Harmonics

Harmonics are the result of nonlinear loads that convert AC line voltage to DC. Harmonics flow into the electrical system because of nonlinear electronic switching devices, such as variable frequency drives (VFDs), computer power supplies and energy-efficient lighting.

Recognize cause and effects of power system harmonics 3, 4

4. Industry Standards

Demonstrate advanced understanding of industry standards as they apply to frequency of power system studies 3, 4

Last Update: May 25, 2022