Module Twelve - Mechanical Construction Methods and Materials - NCCER Substation Slides

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Power Line Worker Level Two: Substation – Mechanical Construction Methods and Materials
Module 82205-12
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Mechanical Construction Methods and
Materials
Module Twelve – 82205-12

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Power Line Worker Level Two: Substation – Mechanical Construction Methods and Materials
Module 82205-12
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Objectives
Upon completion of this module, you will be able to do the following:
1. Identify the types and materials of steel structures.
2. Identify types of fasteners and torque methods and values.
3. Identify types of bus and connectors.
4. Identify the types of bus supports.

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Module 82205-12
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Performance Tasks
Under the supervision of the instructor, you should be able to do the
following:
1. Properly torque fasteners.

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Power Line Worker Level Two: Substation – Mechanical Construction Methods and Materials
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Figure 1 — Transmission substation by Oconee Nuclear Generating Station

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Figure 2 — Subtransmission and distribution substations

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Figure 3 — Construction work high above ground

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Figure 4 — Caution and danger signs

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Figure 5 — Substation structures

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Figure 6 — Detail B of connection with stiffener plates

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Figure 7 — Section from erection drawing

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Figure 8 — Typical distribution substation support structure

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Figure 9 — Steel lattice structure

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Figure 10 — Box truss supports

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Figure 11 — A-frame dead-end structure

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Figure 12 — H-shaped dead-end structure

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Figure 13 — Polygonal A-frame structure

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Figure 14 — A-frame of angle iron and lattice construction

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Figure 15 — Lightning mast tip

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Figure 16 — Polygonal lightning mast

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Figure 17 — Insulators

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Figure 18 — Support insulators

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Figure 19 — Suspension insulator

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Figure 20 — Suspension insulator bells

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Figure 21 — Lightning arresters

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Figure 22 — 115kV ground switch

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Figure 23 — One phase of a gang-operated transmission line switch

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Figure 24 — Circuit breakers

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Figure 25 — Threaded fasteners

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Figure 26 — Screw thread designations

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Figure 27 — Thread types

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Figure 28 — Grade markings for steel bolts and screws

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Figure 29 — Bolt markings for A325 bolts

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Figure 30 — A325 hex nuts

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Figure 31 — Type 3 washers

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Figure 32 — Proper tightening sequence

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Figure 33 — Safety-wired fasteners

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Table 1 — Bolt Chart Information

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Figure 34 — Torque value charts

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Figure 35 — Beam-type torque wrench

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Figure 36 — Click-type torque wrench

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Figure 37 — Digital torque wrench

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Figure 38 — Torque multiplier

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Figure 39 — Installation of tension control bolts

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Feature — Intelligent Bolts

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Figure 40 — Bolt load indicator installation methods

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Table 2 — Gap Measurement

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Figure 41 — Amount of gap before and after turning

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Figure 42 — Belleville washer

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Figure 43 — Fastener elastic and plastic ranges

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Figure 44 — Torque angle gauge

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Figure 45 — Torque angle gauge in use

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Figure 46 — Rigid busbar

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Figure 47 — Tubular aluminum busbar

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Figure 48 — SF6 bus

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Figure 49 — Aluminum strain bus conductor

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Figure 50 — Tubular bus compression fittings

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Figure 51 — Bolted terminal connections

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Figure 52 — Dead-end clamp

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Figure 53 — Aluminum compression connection

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Figure 54 — Welding busbar fittings

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Supplemental Art

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