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Investigating an Electromechanical Differential Relay Misoperation

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 ...
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Testing Techniques for Protection-Class Current Transformers

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 ...
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Testing and Commissioning a Distribution Recloser in Grid-Tie Solar Farms

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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NETA technicians are encouraged to share their stories via our “In the Field column, which explores real-world examples and challenges faced by the electrical testing industry today. Submit your stories by clicking below or learn more about how to submit additional articles.

Industry Topics


Impact of SFRA Setup Issues on Transformer Frequency Response

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 ...
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CAP corner


PF Measurements On Complete Stator Windings

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 ...
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Specs & Standards


ANSI/NETA Standards Update

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 ...
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