Traditional operational limits of a transmission line are established through “static” transmission line rating methodologies. The common practice for transmission line rating is to select very conservative values for the environmental operating conditions of the line. The resulting static line rating is similarly very conservative.
Today, seasonally adjusted ratings (SAR) and ambient adjusted ratings (AAR) push upward a line’s traditional static ratings by simply acknowledging that more realistic environmental conditions exist. Dynamic Line Rating, or DLR, is a transmission line’s actual real-time or forecast power carrying capacity. It is based on the conductor’s operating temperature using real-time line behavior data and weather conditions. Dynamic Line Rating (DLR) is the natural and logical extension of the seasonal and ambient adjusted ratings trend. Why assume a line has only four ratings a year based on seasons when real-time data and line behavior modeling can provide reliable daily or even hourly ratings? This is especially significant as a line’s DLR is typically 10 – 25% higher than its static rating. electricenergyonline
Numerous studies have shown this additional capacity provides opportunities in economic dispatch, trading, operations, and congestion mitigation. Application of DLR is also a powerful tool for improving contingency planning, cost effectively addressing lines with slow load growth, and deferring or eliminating the need for line upgrades.
Yet with all these economic advantages, DLR is sparsely deployed. The reasons are two-fold. First generation DLR systems presented numerous issues to early adopters, discouraging wider deployment. Secondly, demand drivers were either weak in the deregulating transmission environment, or were poorly understood.
For more details click here: Dynamic Line Rating
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