It also includes the weather case assumed to cause creep, the heavy load case which potentially causes permanent stretch of the various cables, and various weather cases needed for displaying the cables at various temperatures.A weather cases table typically includes a group of weather cases for checking the strength of the structures, a group for g various g geometric clearances ((to g ground, blow out, checking between phases, swings, etc.), and a group for checking ground wires and conductors tensions.All weather cases which will be used in a particular design must be described in the Weather Cases table which you reach with Criteria / Weather.In PLS-CADD, all cable sags and tensions calculations, and consequently all loads and clearance calculations, are made for designated weather cases. Such a combination is defined herein as a "weather case".Many strength and serviceability (clearances) criteria assume that the line is subjected to a given combination of wind, ice (or snow) and temperature.POWER TRANSMISSION LIMITED, GANDHINAGAR, GUJARAT, INDIA Training Programme on Design of Transmission Lines, Structures and Foundations in Sri Lanka from 01 to 05 July 2013 for CEB Engineers
POWER TRANSMISSION LIMITED, GANDHINAGAR, GUJARAT, INDIA 11 If, after having developed some criteria, you want to save them to become part of a permanent library you can do so with the Criteria / Save CRI command. This action will copy all the data in “Standard.cri” into the new project criteria file “project.cri”.If standard criteria already exist in a file “Standard.cri”, all you need to do to use them in a new project is to load “St d d i” with “Standard.cri” ith Criteria C it i / Load L d CRI.When you save a project, the criteria in use at the time of saving are saved in the file “Project.cri”.or they can be developed only for a specific project.Criteria file can be developed in standard libraries to be shared among various projects.A set of criteria can be saved in a single file, file which has the “.cri” extension.The design criteria are selected in the Criteria menus.Design criteria that can be used and checked with PLSCADD.For example, the data for a Drake conductor is permanently stored in the file named Drake.This is done in the g Cable Data dialog box (see Figure 97 and 9.10) which you reach with Sections / Edit Cable Data.POWER TRANSMISSION LIMITED, GANDHINAGAR, GUJARAT, INDIA 7
The feature code used to define the ground clearance line is specified in the Terrain / Feature Code Data / Ground Clearance Feature Code dialog.Terrain / Feature Code Data / Edit command or loaded from existing feature code tables with Terrain / Feature Code Data / Load FEA File.Feature code files use the “.fea” extension. These feature codes must be defined in the project feature code file before they can be used in a terrain file.A separate feature code must be created for each category of terrain or obstacle points. Code clearances depend on the voltage of particular conductors.These requirements include minimum code clearances to be met above or to the side of the points as well as symbols to be used to display these points on the screen or on the final drawings.Before generating a terrain file, one should decide on broad categories of terrain or obstacle points which have unique requirements.POWER TRANSMISSION LIMITED, GANDHINAGAR, GUJARAT, INDIA Ch -16
GANDHINAGAR, GUJARAT, INDIA ENGINEERING DEP PARTMENT POWER TRANSMISSION LIMITED, GANDHINAGAR, GUJARAT, INDIA 3
Software f installation ll Setting preferences Defining Feature codes Generating cable files Generating criteria files Generating structure files getting data from site and generating XYZ file Defining line alignment Adding structures Adding section (stringing wire) Plotting files Generating stringing files Steps are required to perform tower spotting using PLS CADD Training Programme on Design of Transmission Lines, Structures and Foundations in Sri Lanka from 01 to 05 July 2013 for CEB EngineersĬHAPTER - 16 BRIEF ON TOWER SPOTTING IN PLS-CADD POWER TRANSMISSION LIMITED, GANDHINAGAR, GUJARAT, INDIA TRAINING PROGRAMME ON DESIGN OF TRANSMISSION LINES, STRUCTURES AND FOUNDATIONS CEB ENGINEERS By GANDHINAGAR, GUJARAT, INDIA Training Programme on Design of Transmission Lines, Structures and Foundations in Sri Lanka from 01 to 05 July 2013 for CEB Engineers