Determining Crossing Conductor Clearance Using Line-Mounted LiDAR

Determining Crossing Conductor Clearance Using Line-Mounted LiDAR Determining Crossing Conductor Clearance Using Line-Mounted LiDAR - Start

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Determining Crossing Conductor Clearance Using Line-Mounted LiDAR - Description

McCall, J., Spillane, P., Lindsey, K.. Lindsey Manufacturing. USA . CIGRE. US National Committee. 2015 Grid of the Future Symposium. The Trouble with Line Crossings. Numerous variables affect clearance between crossing or co-located lines:. ID: 654610 Download Presentation

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Determining Crossing Conductor Clearance Using Line-Mounted LiDAR




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Presentations text content in Determining Crossing Conductor Clearance Using Line-Mounted LiDAR

Slide1

Determining Crossing Conductor Clearance Using Line-Mounted LiDAR

McCall, J., Spillane, P., Lindsey, K.Lindsey ManufacturingUSA

CIGRE

US National Committee

2015 Grid of the Future Symposium

Slide2

The Trouble with Line Crossings

Numerous variables affect clearance between crossing or co-located lines:

Conductor

characteristics

Ambient temperature and wind assumptions (for conductor movement)

Insulator and structure deflection

Sag of each line, which depend on:

Current (for heating)

S

olar radiation

C

ooling

associated with

wind

Insulator

swing and tower movement from wind and conductor expansion/contraction,

Weight

effects of ice and snow

loading

etc

Slide3

ENMAX

’ Particular Problem

138kV line co-located above a 25kV circuit for 9.3km

The T and D

lines

have

very

different

loading

profiles

New Shepard Energy Centre

adds

800MW

local generation

Altered

power flows

result

in very

different loading profiles on

138kV circuit

Identified

system

contingencies

could

result in

greatly

increased sag

Concern over verifying clearance

Slide4

Transmission Line Monitor with Integrated LiDAR

Enmax

chose the Lindsey TLM conductor monitor designed for dynamic line rating applications

Integrated LiDAR provides direct and continuous measurement of conductor

c

learance to ground

Accurately detects changes in clearance from:

Conductor sag from heating / cooling

Vegetation growth

Slide5

138kV

25kV

Difference in measurements provides inter-line clearance

Slide6

Added algorithm to blocks s

tep

changes of

>1m:

Reported

line-to-ground clearance reported by

either TLM

Calculated difference

between monitor

sets

Bad Measurement

TRUCKING

Slide7

LiDAR Geometrical Corrections

LiDAR Angular CorrectionsBoth TILT (conductor slope) and ROLL (conductor roll) are correctedResult is a direct downward looking measurement

Conductor Swing (Lateral)Swing will result in either:

Slight under-reporting

(report C instead of B),or

Report worse case (A)

Based on application need, no compensation required

Slide8

Clearance varies by 2.3m over the day

BUT…

138kV line current is 2x as high here

as it is here,

While 25kV current is almost constant

Counterintuitive:

Increased current produces increased sag

Should reduce clearance

What’s happening?

Slide9

138kV Span Clearance Comparison

Why

do spans

less than ¼ mile away behave so differently?

Slide10

138kV Span Elevation Comparison

Span A

Span B

Slide11

138kV Span Elevation Comparison

Span A

Span B

Uniform adjacent spans

Elevated adjacent spans

Sag of the elevated spans lift the middle span.

A 100mm outward pull on the insulators results in 1.5m sag decrease

Slide12

Summary

Ensuring clearance between line crossings or parallel lines is awkward at bestLine mounted LiDAR-based monitors successfully provide direct measurement of crossing clearanceUnexpected phenomena, such as traffic, can be successfully dealt withNext Steps

Additional deployment of monitor steps along lineEvaluation of moving to pilot dynamic line rating system

Slide13


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