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3035: Power Apparatus Bushing Condition Assessment and Diagnostics

Bushing failures are responsible for a large number of costly forced outages of transformers, breakers and reactors. Almost half of the bushing failures are catastrophic in nature. Many diagnostic techniques are available for assessing the insulation condition of oil-paper insulated equipment in general and bushings in particular. However, no single technique seems to work all the time. Some techniques are too costly for implementation on a large scale. What is needed is a combination of ef

SE

Research

4302: Confined Space Program - Best Practices

H&S

Research

33137: Validation of Existing Lattice Transmission Towers Using 2D and 3D Models

OTD

Research

7071B: Intelligent Use of Energy in the Production of Cannabis in Greenhouses

Energy consumption in the production of cannabis in greenhouses is characterized by a large variation between the different producers. This is the result of differences in equipment, but even more indifferences in starting points for climate control. Cannabis is very sensitive to quality loss caused by ‘botrytis’, a fungal disease that destroys the flower. The production of cannabis in greenhouses has just recently started. That is why proper recipes to control the disease and produc

Aug 31, 2021 - Mar 31, 2022

ADO

DSM

Research

03108: Gates Inspection and Maintenance Guide

Hydroelectric facilities have been constructed since the early 1890s. As of this writing, the majority of the headgates, spillway gates, and other water control devices at these facilities are at an average age of approximately 70 years. Although gates are essential components of an operating hydro facility for reasons such as river flow regulation, reservoir safety, and flood control, and meeting environmental and recreational priorities, they are often not recognized as a critical priority for

Sep 8, 2020 - Jul 27, 2022

Research

3113: Utility Design Practices and Operating Experience with Shunt Capacitor Banks

Shunt capacitor banks are applied universally on power transmission and distribution networks for power factor correction to regulate voltage and reduce losses. Their ratings typically range from 10 MVAr to 400 MVAr when applied at substations, depending on the level of reactive power compensation required. Because individual capacitor units are manufactured in ratings limited to about 20 kV, 1000 kVAr, numerous units need to be interconnected in series-parallel arrangements to support the desir

PSPO

Research

0429: CPF: Benchmarking of Ensemble Streamflow Forecast Usage in Hydropower Planning

Streamflow forecast information is increasingly available to hydropower owners and operators to assist with real-time operations of hydropower projects; however, this forecast information is regularly used incorrectly, is misunderstood, or is under-utilized, especially in the case of streamflow ensembles. Streamflow ensembles are multiple forecast traces that provide an indication of potential forecast uncertainty (or certainty) at a range of time horizons, and they can inform the operational de

Aug 29, 2016 - Apr 4, 2018

Research

3012: Application of the Recovery Voltage Method for the Condition Assessment of Power Transformers

A test system, consisting of a test chamber and a conditioning chamber to hold oil and coilsamples, was built at Powertech Labs to carry out recovery voltage measurements (RVM). Acomputer controlled test system for recovery voltage measurement, which had been alreadyconstructed at Powertech Labs, was installed to measure and monitor the response voltage,temperature, and moisture content inside the test chamber. Experiments were performed onnaphthenic and paraffinic transformer oils, on bare-wire

SE

Research

5134: Interharmonics: A Tutorial on Their Sources, Characteristics, Measurement and Mitigation

Interharmonics are spectral components whose frequencies are not integral multipliers of the supplyfundamental frequency. They can be produced by variable frequency drives, arc furnaces, andfluctuating loads. Interharmonics are more troublesome than harmonics. Firstly, the frequencies ofinterharmonics can vary with the operating conditions of the interharmonic‐producing loads, whichmakes them more difficult to mitigate. Secondly, interharmonics can cause flicker in addition todistorting the wave

PQ

Research

0391: CPF: Hydro Turbine Generator Start/Stop Cost Study

This report reviews the literature, studies, and presentations regarding the effects of start/stops on hydroelectric equipment. Changes in power marketing and the need for renewable resource integration have increased attention to the impacts of increased start/stops. Hydropower’s operational characteristics have made it a valuable resource for traditional load balancing and following. The value of this flexible operation increased in the 1990s when deregulation of some energy markets crea

Aug 24, 2015 - Jul 25, 2016

HPE

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