Public Downloads

Brochures

DSTAR Brochure

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Executive Summaries

Distributed Generation Impact

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Ferroresonance Guidelines for Modern Transformer Application

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Padmounted Transformer Tank Fault Withstand Capabilities

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Newsletters

DSTAR Newsletter Volume 1 - August 2013

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DSTAR Newsletter Volume 2 - November 2013

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DSTAR Newsletter Volume 3 - March 2014

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Papers

A Practical Approach for Designing Operationally Efficient Secondary Distribution Systems

Electric utilities in the US are faced with a unique and often conflicting set of challenges in their current operating environment. They are under increasing pressure to design “smarter” systems and improve operational efficiency, even as the integrity of their physical infrastructure declines, and human resources are more constrained. In order to meet these challenges, today’s distribution designer must be equipped with tools that will help him/her do their job more efficiently. There is a wide range of applications and technologies focused on primary systems, substations and transmission grids, but the design of secondary systems is often overlooked. This paper presents a method and application for the optimal design of secondary systems to meet technical requirements while minimizing total owning costs, including the impact of losses.

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Best Practices for Storm Response on U.S. Distribution Systems

In 2009, the DSTAR consortium commissioned a study of the best practices for utility storm response. The study examined the practices, procedures and experiences of U.S. utilities during major storm occurrences with the goal of understanding and conveying what went right and what went wrong during the build-up, restoration and ramp-down phases. The investigation included detailed utility surveys, interviews with storm bosses, vendors and consultants, and reviews of reports, proceedings, and papers. The result is comprehensive discussion of many important aspects of storm restoration with an emphasis on best practices and lessons-learned from past experiences. This paper summarizes some discussion items and key findings from the study, particularly revealing cases, and recommendations from utility experiences.

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Distribution Transformer Thermal Behavior and Aging in Local Delivery Distribution Systems

This paper characterizes the themal behavior and insulation aging of transformers applied in the local delivery concept of distribution, based on measured data and thermal models.

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DSTAR’s Transformer Cost Analysis Software Enhances Utility Decision Process

Distribution transformers represent a significant cost to electric utilities, both as a capital investment and as an ongoing operating expense. A survey of seven 2003 FERC Form 1 filings shows that distribution transformers can account for approximately 9 to 20% of total distribution capital spending in a year. Productivity tools that help to minimize transformer total owning costs and increase overall asset utilization can make a significant impact on a distribution utility’s bottom line. The Distribution Systems Testing, Application, and Research (DSTAR) utility consortium commissioned the development of the Transformer Owning Cost Software (TOCS) tool for analyzing and comparing the total owning cost of distribution transformers. This white paper describes the concepts and applications of the tool.

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The Breakdown and Mitigation of Technical Losses on Distribution Power Systems

There has been an increasing focus on energy efficiency and demand reduction among utility companies and regulatory agencies in the United States. Technical losses within distribution systems are under increasing scrutiny. One of the key issues is to understand where losses occur along a “typical” feeder and what aspects of feeder engineering and construction contribute to or mitigate losses. In a recent project1, the DSTAR utility research consortium looks for answers to both questions. This paper summarizes approaches and findings from the project.

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Presentations

Best Practices for Storm Response - DistribuTech 2010 Presentation

In 2009, the DSTAR consortium commissioned a study of the best practices for utility storm response. The study examined the practices, procedures and experiences of U.S. utilities during major storm occurrences with the goal of understanding and conveying what went right and what went wrong during the build-up, restoration and ramp-down phases. The investigation included detailed utility surveys, interviews with storm bosses, vendors and consultants, and reviews of reports, proceedings, and papers. The result is comprehensive discussion of many important aspects of storm restoration with an emphasis on best practices and lessons-learned from past experiences.

This presentation summarizes some discussion items and key findings from the study, particularly revealing cases, and recommendations from utility experiences.

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DSTAR Overview

Short Overview of DSTAR
Who We Are; What Distinguishes US; Where Do We Fit; Consortium Structure; Research Areas; Program Content; Selected Project Descriptions.

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Surge Protection of Electronic Controllers for Overhead Distribution Feeder Capacitor Banks

Utilities have installed many electronic devices (IEDs) to enable safe, reliable, and efficient operation of the distribution system. These IEDs include controllers for overhead feeder capacitor banks. Some utilities have reported controller failures due to power surges and overvoltage events.

This presentation is based on Project 14-4: Surge Protection of Electronic Capacitor Controllers in Distribution Systems. It summarizes an investigation by which controller installations at several utilities were simulated in the Alternative Transient Program (ATP) to quantify the surge voltage and currents on the distribution circuit as well as on the controller circuits. The controller is powered via the control power transformer (CPT) which reduces the feeder voltage (typically 15, 25, or 35 kV) to 120 V. The impact of surge arresters at the CPT and/or the controller were investigated relative to surge voltages at the controller.

In addition, the impact of transformer and controller ground connections were also investigated. To improve quality of the CPT model, several frequency scans were performed on a 0.5 kVA CPT from which a terminal model was synthesized for the ATP model. From the parametric analysis, several recommendations for CPT and controller grounding as well as surge arrester placement were developed.

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