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Dynamic Line Rating System .pdf

Original filename: Dynamic Line Rating System.pdf
Title: LindseySmartline02-05-16(3)

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Dynamic Line Rating System


Next generation transmission line dynamic
rating and forecasting system using
real-time measured conductor data
combined with reliability-based methods

The SMARTLINE™ dynamic line rating (DLR) system uses
reliability-based rating and forecasting techniques, and
real-time conductor and weather data. Compared to conventional dynamic line rating (DLR) methods, SMARTLINE ratings
are developed by actively learning how the conductor
behaves with regard to conductor temperature, weather,
current, and the conductor’s exact clearance-to-ground.
Using reliability-based methods, SMARTLINE’s ratings demonstrate clearance compliance in addition to traditional thermal
limit compliance. The result are true capacity limits and
reliable capacity forecasts. SMARTLINE eliminates fixed-capacity transmission assets, and replaces them with a living set of
transmission pathways whose capacities reflect real-time
conditions. SMARTLINE is key to a true “smart” transmission

SMARTLINE provides a
convenient snapshot view of line status
at any monitored point.

DLR based uniquely on Measured Conductor
Clearance, Temperature and Load
Unlike other DLR techniques, SMARTLINE utilizes actual, simultaneously measured values of conductor clearance, temperature and
load. This data is calibrated to IEEE Standard 738’s relationship
between load, conductor temperature and actual weather data.
This provides an accurate and intelligent basis for determining
thermal and clearance based line ratings under all conditions. In
comparison, other methodologies interpolate values from look-up
tables, relying on data such as vibration to infer critical span sag.
SMARTLINE works just as well on bundled as well as single


SMARTLINE provides a variety of transmission line ratings:


Dynamic line rating has always had one meaning: A line’s maximum
instantaneous current carrying capacity while ensuring no thermal
damage occurs. SMARTLINE can provide either this traditional,
basic, DLR or a more operationally useful clearance-enhanced DLR.
This improved DLR rating results when Lindsey TLM™ LiDAR-based
conductor monitors are installed on clearance-limited spans.
The use of clearance-limited spans ensures clearance requirements
are not violated while also eliminating risk of conductor thermal
damage. If the selection of monitored spans is given no consideration as to clearance limit monitoring, SMARTLINE provides basic
DLR, consistent with traditional DLR solutions.

SMARTLINE RBR – A Reliability Based Rating
Alternative to Static Ratings
Instantaneous by nature, dynamic line ratings change constantly,
and can appear quite erratic. Unique to SMARTLINE, the Reliability
Based Rating (RBR) is a statistically stabilized DLR rating. This

stabilized value can act as a reduced risk line rating alternative. SMARTLINE RBR is designed for operators to ensure, with
a 98% or greater confidence factor, the transmission line is
operating over time within both clearance and thermal

SMARTLINE RBF – Reliability Based Forecasts
for Dispatch Applications
SMARTLINE’s Reliability Based Forecast (RBF) ratings are
SMARTLINE RBR line capacity ratings adjusted for forecasted
future weather conditions. Available for any timeframe for
which weather forecasts are available, SMARTLINE RBF
ratings are tailored to address energy dispatch and trading
needs. SMARTLINE line capacity forecasts are available for
periods ranging from hours, to days, ahead.

Cost Effective Alternative to Reconductoring
SMARTLINE RBR can quickly document 10-25% additional
capacity availability on existing lines, allowing for deferral or
elimination of reconductoring projects.


Line Rating System
Dynamic Line Rating System

Static Line Rating
Static Rating

Extreme events, such as severe ice loading or
emergency loading conditions, are recognized
and the resulting changes in conductror behavior
are automatically incorporated in SMARTLINE’s


Recognize Extreme Events

Eliminate Transmission Constraints &

SMARTLINE ratings can be used to eliminate or
reduce congestion costs. The combination of
actual conductor measurements and learning
over time produce ratings that are reliable and


SMARTLINE DLR is a real-time line rating meeting clearance and thermal limits.
SMARTLINE RBR is a statistically smoothed DLR rating providing superior
operational visibility compared to static ratings.

Critical Span Measurements

The SMARTLINE system uses data from Lindsey
TLM conductor monitors which maybe placed on
all critical spans on a transmission line. The
measurement of actual critical span clearance
makes obsolete the need to use data from several
spans away to infer critical span clearance.

Static Line Rating

The SMARTLINE system is the first and only
ratings solution based on directly monitored
clearances by the Lindsey TLM conductor
monitor. SMARTLINE ratings are based on
continuous geospatial clearances; a requirement
of legal and safety standards. Clearance compliance to standards is directly monitored and
conductor behavior is learned and understood.


Clearance Monitoring

Computing Requirements

The SMARTLINE system supports flexible hosting
options. Host in a secured virtual environment, or
integrate into an existing IT environment.

Lindsey Manufacturing
760 N. Georgia Avenue
Azusa, CA 91702 USA
Tel. 626-969-3471
©2016 Lindsey Manufacturing. Lindsey, TLM, SMARTLINE, TOUCHING HIGH VOLTAGE
EVERYDAY are trademarks or registered trademarks of Lindsey Manufacturing. IEEE is a
trademark of the Institute of Electrical and Electronics Engineers, Inc. U.S. Patent
7, 786,894 and other U.S. and foreign patents pending.
Publication Number 11F-002 SMARTLINE • February 2016


SMARTLINE RBF provides stable forecast line capacity forday
ahead dispatch or current day operations.

Touching High Voltage Everyday™


Dynamic Line Rating System.pdf - page 1/2
Dynamic Line Rating System.pdf - page 2/2

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