Module Nine - Grounding Systems - NCCER Substation Slides

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Power Line Worker Level Two: Substation – Grounding Systems
Module 82203-12
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Grounding Systems
Module Nine – 82203-12

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Power Line Worker Level Two: Substation – Grounding Systems
Module 82203-12
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Objectives
Upon completion of this module, you will be able to do the following:
1. Explain the purpose of a ground grid system.
2. Describe the methods and materials for installing an underground
grid.
3. Explain the safety precautions used and the PPE required when
repairing and/or expanding an existing ground grid.
4. Describe how connections are made in a ground grid system using
exothermic welded, compression, and mechanical connectors.

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Power Line Worker Level Two: Substation – Grounding Systems
Module 82203-12
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Performance Tasks
Under the supervision of the instructor, you should be able to do the
following:
1. Make connections in a ground grid system using exothermic
welded, compression, and mechanical connectors.

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Power Line Worker Level Two: Substation – Grounding Systems
Module 82203-12
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Figure 1 — Substation

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Figure 2 — Electrostatic induction

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Figure 3 — Electromagnetic induction

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Figure 4 — Energized soil around an energized grounded object

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Figure 5 — Step potential hazard

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Figure 6 — Touch potential hazard

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Figure 7 — Connections to a grounded grid

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Figure 8 — Substation grounding plan

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Figure 9 — Wenner four-point method

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Figure 10 — Electrolytic electrode

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Figure 11 — Ground grid layout

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Table 1 — Ground Grid Conductor Sizes

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Figure 12 — Fence ground grid dimensions

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Figure 13 — Ground grid connections

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Table 2 — Connection Method Advantages and Disadvantages

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Figure 14 — Mechanical connector

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Figure 15 — Cable-to-cable mechanical connectors

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Figure 16 — Mechanical ground connection assembly

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Figure 17 — Compression connector

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Figure 18 — Types of compression connectors

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Figure 19 — Die number stamped in connector body

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Figure 20 — Crimping tool

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Figure 21 — Exothermic weld mold

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Figure 22 — Exothermic electronic igniter

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Figure 23 — Completed exothermic weld

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Figure 24 — Cable-to-cable mold configurations

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Figure 25 — Exothermic welding steps

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Figure 26 — Ground rod placement

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Figure 27 — Ground rod installation

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Figure 28 — Equipotential zone below switch handle

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Figure 29 — Fall-of-potential test setup

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Figure 30 — Ground grid test report form

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Figure 31 — Temporary ground mat

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Supplemental Art

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Course Map

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