Catenary to POA (Point of Attachment) (CatPoi)

Type: Batch Application

Extends or hacks existing catenary (power line) lines to existing POA (Point of Attachment) symbols.

Detailed Description

Power lines are typically represented as catenaries.  A catenary is the curve that an idealized hanging chain or cable assumes under its own weight when supported only at its ends. The curve has a U-like shape and mathematically, the curve is the graph of the hyperbolic cosine function.

Power line catenaries

The function Insert Catenaries (InsCat) is used to place lines on power line catenaries and these lines may fall short or overshoot the intended POAs (Points of Attachments).  If the POAs are represented in the VrOne file as symbols then Catenary to POA can be used to attach these lines to their POAs in a batch mode.  The catenaries do not need to be edited before running this batch application.

Please see also Insert Catenaries (InsCat)

Power line catenaries before (left) and after (right) running Catenary to POA

Method

The catenary lines are identified by layer numbers and the POA symbols are identified by layer numbers and optional Graphic Pointers.  During processing, the catenary lines are used to determine the POA symbol for each end of the line.  A catenary formula is used to determine the distance each POA symbol is from the line so the symbols do not need to physically overlap the original catenary line.

The catenaries are then recomputed using the POAs and original catenary lines.  The POA coordinate positions become the first and last coordinate position for each catenary line.  If a line does not have a corresponding POA symbol within a user defined tolerance then the coordinate position of that end of the catenary remains unchanged.

Parameters for Catenary to POA

Parameters for Catenary to POA

Workspaces to consider

Defines the workspaces to consider when running Catenary to POA.  Options are Current or All open.

Search distance from catenaries to POA symbols (ground)

The search distance from existing line catenaries to existing POA symbols.  POA symbols that are within this offset distance from a catenary will be considered and the closest one will be used.  This parameter is entered as ground units.

Point spacing (ground)

Approximate distance between the points on the final catenary curve in ground units.

Line layers to search (NumLine)

The layers containing the existing line catenaries are defined with this parameter and a Number Line may be used to specify multiple layers.

Symbol layers to search (NumLine)

The layers containing the existing POA symbols are defined with this parameter and a Number Line may be used to specify multiple layers.

Symbol Graphic Pointers to search (NumLine)

Along with symbol layers, symbol graphic pointers may also be searched.  A Number Line may be used to specify multiple graphic pointers.

Available Key-ins