Determining Cellulose Degradation in Transformers Using Indirect Tests
August 31, 2021The design life of a transformer is usually about 20 to 25 years. In the United States, estimates show the average age of a transformer is currently around 42 years, which means a number of even older units are still in service. As with all things, transformers age and degrade over time. Transformer failures can come from a variety of sources including through faults, faulty crimps and brazes, corrosive sulfur, poor design, water intrusion, collateral damage from a bushing or load tap changer (LTC) failure, incorrectly sized leads, and a host of other issues. Overall, however, the demise of a transformer from normal aging is linked directly to the condition of the solid insulation (i.e. paper, cellulose).
Condition Monitoring Realities: Dealing with the Unexpected
August 15, 2021We should have expectations when applying condition monitoring to transformers. If we know what to expect then we can identify measurements which are unexpected or anomalous and worthy of deeper investigation.
Doble acquiert le fabricant de systèmes de test haute tension Phenix Technologies
August 9, 2021Doble Engineering Company, leader des solutions de diagnostic pour les réseaux électriques et filiale de ESCO Technologies Inc. (NYSE : ESE), a annoncé aujourd’hui l’acquisition des actifs de Phenix Technologies, le principal fabricant de systèmes et de composants de test haute tension. L’acquisition permet à Doble de développer son catalogue d’équipements de test et de mesure haute tension, et de continuer son développement dans les secteurs commerciaux et industriels.
Doble Engineering Company Launches F8000 Power System Simulators
June 8, 2021Configurable next-generation hardware seamlessly blends conventional and digital test performance
Doble Engineering Company lance les simulateurs de réseaux électriques F8000
June 8, 2021Ce matériel configurable de dernière génération allie les performances des
ESCO Announces Acquisition of Global Utility Supplier
May 20, 2021ESCO Technologies Inc. (NYSE: ESE) today announced that it has entered into an agreement to acquire I.S.A Altanova Group S.R.L. (Altanova), a well-established, leading supplier in the field of advanced condition assessment technologies centered around partial discharge (PD) measurement and analysis, as well as test instruments for electrical apparatus (www.altanova-group.com).
Doble simplifie les tests des systèmes d’isolation des équipements à haute tension avec Spark P3
April 12, 2021L’analyseur universel de décharges partielles et d’interférences électromagnétiques évite d’avoir recours à un expert pour interpréter les données grâce à la classification automatique des signaux, aux assistants de mesures et bien d’autres fonctionnalités.
Avec Calisto H1, Doble popularise la surveillance d’état des transformateurs
April 8, 2021Ce nouveau détecteur d’hydrogène prélève l’huile du transformateur en temps réel, ce qui permet aux compagnies d’électricité de disposer de davantage d’informations sur la santé pour prendre des décisions plus rapides et plus sûres.
Successful application of AI techniques: A hybrid approach
November 23, 2020AI systems provide a lot of promise in the analysis and evaluation of power system data. This article shows some of the benefits of the application of AI, identifying the strengths and weaknesses of the approach, and provides a way forward to apply AI in a meaningful and controlled manner.
Think of a number…
November 5, 2020An asset health index (AHI) summarises a lot of disparate data into a single value in order to estimate the condition of the asset, such as a transformer. The big question is: does everyone understand what the AHI really means? Technical information used to derive an AHI is lost. At the same time, looking at the AHI value, the end-user can get a feeling that they know all they need to know, which sometimes can be misleading.
Doble augmente la productivité, la précision et les performances des tests de transformateurs avec le nouvel analyseur de réponse en fréquence de balayage M5500
November 2, 2020Cet instrument SFRA nouvelle génération réduit considérablement le temps de test et les coûts de maintenance tout en garantissant des mesures de haute qualité sur site.
Impact of SFRA Setup Issues on Transformer Frequency Response
November 1, 2020Sweep frequency response analysis (SFRA) is a popular test to confirm the mechanical and electrical integrity of a transformer. However, the resulting traces can be difficult for field personnel to interpret due to the visual nature of the data. It is more straightforward to compare numbers against prior data or against a stated limit than to interpret subtle differences in SFRA traces. If setup-related issues are not addressed during the testing process, return trips are often required to take additional shots to represent the transformer more accurately. These trips cost time and resources, so being able to identify a setup problem early can keep extra work to a minimum. A trained eye can focus in on a problem area quickly and identify a test setup issue promptly. Such confidence only comes at the expense of hours spent analyzing data. This article discusses common setup problems and their impacts.
An Intelligent System for Condition Assessment of Power Transformers
October 23, 2020Health index (HI) approach has been adopted widely as a tool that assists the asset managers to prioritise their plans and actions. However, the conventional computation of HI, which is based on scoring and ranking, has several drawbacks. In this work, the fuzzy logic approach is utilised to build up an intelligent HI system to assess the condition of power transformers based on oil quality and DGA results.
PSDcast – Do Cali Wildfires Emphasize Need for Green Energy?
October 19, 2020The episode covers the importance of upscaling infrastructure and maintenance with the transition of renewables against the background of climate-driven weather events, the expansion of microgrids, and how Doble, specifically can support utilities through the transition.
La montée en compétences de la main-d’œuvre électrotechnique : L’évolution des compétences offre de nouvelles opportunités
October 14, 2020Une main-d’œuvre qui comprend le fonctionnement du réseau électrique est essentielle au succès de l’industrie.