System-wide Dynamic Ratings (SDR)

Overview

System-wide Dynamic Ratings (SDR) is Splight's real-time transmission line DLR/AAR monitoring and forecasting solution. It continuously calculates the thermal capacity of each transmission line segment based on real-time environmental data and terrain-aware physics-based modeling. Unlike static or seasonal ratings, DLR/AAR enables operators to unlock latent capacity by dynamically adjusting line ratings based on actual field conditions.

Splight's SDR is a 100% digital, sensorless solution requiring no hardware installation. The system provides real-time and forecasted ratings, sag estimates, limiting segment identification, and GIS visualizations. It also supports downstream control integrations and is designed for seamless EMS compatibility.

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Required Inputs

DLR relies on high-quality line metadata and environmental telemetry sourced via Splight's supported data providers.

Real-Time Input Attributes

N/A

Metadata Requirements

For all transmission lines

Metadata	Description	Required?	Example
conductor_type	Physical type of conductor used on the line (e.g., material, strand count)	Yes	"Drake 795 ACSR"
absorptivity	Solar absorptivity coefficient of the conductor (dimensionless, 0–1 scale)	Yes	0.5
atmosphere	Atmospheric condition setting (used to model cooling effect and air density)	Yes	"clean"
capacitance	Electrical capacitance per unit length of the conductor	Yes	0.012 µF/km
conductance	Electrical conductance per unit length of the conductor	Yes	0.001 mS/km
conductor_mass	Mass per unit length of conductor	Yes	1.07 kg/m
diameter	Outer diameter of the conductor	Yes	28.14 mm
emissivity	Emissivity coefficient of the conductor surface (dimensionless, 0–1 scale)	Yes	0.85
length	Total length of each line segment	Yes	1.2 km

For all segments

Metadata	Description	Required?	Example
segment_coordinates	Geographic polyline representing the spatial route of each line segment	Yes	GPS polyline
absorptivity	Solar absorptivity coefficient of the conductor (dimensionless, 0–1 scale)	Yes	0.5
atmosphere	Atmospheric condition profile (used for air density and cooling models)	Yes	"clean"
capacitance	Electrical capacitance per unit length of the conductor	Yes	0.012 µF/km
conductance	Electrical conductance per unit length of the conductor	Yes	0.001 mS/km
conductor_mass	Mass per unit length of conductor	Yes	1.07 kg/m
azimuth	Orientation angle of the line segment relative to true north (in degrees)	Yes	125°

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Features

• Our ratings and forecastings include: DLR_rating, AAR_rating, DLR_STER_rating, DLR_LTER_rating, AAR_STER_rating, AAR_LTER_rating, DLR_forecast_48, DLR_forecast_72, DLR_forecast_240, AAR_forecast_48, AAR_forecast_72, AAR_forecast_240

• Daily retraining of forecastings

• Real time and historical irradiance, sag estimate, conductor temperature, temperature, wind speed, wind direction for each segment. Highlightning the current most limited segment.

• Real time and historical wind speed used in DLR calculation (each point is the most limited segment of that moment in time wind speed)

• Most limited segment ranking

• Interactive 3D world map

• Real-time GIS layers showing wind speed and ambient temperature across the geography of interest

• Custom integration with any Energy Management System (EMS)

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Control Capabilities

While DLR itself does not issue control commands, it can integrate with other Splight control modules such as DCMG to enable real-time automated response based on DLR limits.

Safety Controls

• Forecast confidence thresholds prevent false positives

• Time delay logic to avoid reacting to short-lived weather noise

• EMS override modes available to keep operator in control

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Operating Constraints

• Accuracy depends on the quality of metadata and geolocalization precision given by the user/customer

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Deployment Notes

• No hardware installation required

• Typical deployment time: 2 weeks depending on metadata availability

• Splight provides full connector setup and API integration support

• Models retrain daily using operational performance data

• Future features (e.g., confidence scoring, fault localization) are modular upgrades

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Support

For assistance with onboarding, telemetry setup, or understanding control behavior, contact your Implementation Manager or email [email protected].

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Watch this video walkthrough

Video comming soon

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