Featured Stories
Investigating an Electromechanical Differential Relay Misoperation
Transformer differential protection based on ANSI 87 is one of the most common protection methods for large power transformers due to its outstanding speed and accuracy. However, given the complexity ...
Testing Techniques for Protection-Class Current Transformers
Relaying current transformers serve as critical components in the design of a protection scheme. CT performance under fault conditions should be within its operating characteristics for a true representation of ...
Testing and Commissioning a Distribution Recloser in Grid-Tie Solar Farms
Rapid photovoltaic (PV) penetration into the electric grid has mandated deeper operational and technical understanding of protection schemes in PV farms. An effective protection scheme ensures a grid-connected system functions ...
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Industry Topics
Impact of SFRA Setup Issues on Transformer Frequency Response
Sweep 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 ...
CAP corner
PF Measurements On Complete Stator Windings
Power factor (PF) measurement has been performed on stator windings for many decades and is a widely accepted and recommended ...
Specs & Standards
ANSI/NETA Standards Update
ANSI/NETA ATS–2017 Revision Underway ANSI/NETA ATS–2017, Standard for Acceptance Testing Specifications for Electrical Power Equipment & Systems continues an American National Standard revision process that is scheduled to be completed by the end of 2020. The new edition will be ...