IEEE C57.13.5-2019

IEEE C57.13.5-2019 is a technical standard for the performance and test requirements of instrument transformers used in nominal system voltages of 115 kV and above. It addresses how these components should be evaluated for accurate measurement and dependable operation in high-voltage power systems. For utilities, manufacturers, and engineers working with power, energy, and industry applications, this specification helps support consistent design, testing, and procurement decisions where measurement accuracy and reliability matter.

About IEEE C57.13.5-2019

This standard defines the performance and test framework for high-voltage instrument transformers, with attention to equipment intended for systems at 115 kV and above. IEEE C57.13.5-2019 is relevant where current and voltage sensing must remain dependable under demanding electrical conditions. It provides a clear technical reference for evaluating behavior, test methods, and expected performance, helping align product design and acceptance criteria. In practice, it supports more consistent comparison of compliant devices across procurement, engineering, and quality assurance processes.

Where is IEEE C57.13.5-2019 used?

IEEE C57.13.5-2019 is typically used in high-voltage substations, transmission networks, and other power-system installations that rely on instrument transformers for measurement, metering, or protective functions. It is relevant to transformer manufacturers, utility engineering teams, test laboratories, and equipment specifiers working with systems at 115 kV and above. The standard is especially useful when selecting or verifying transformers for revenue metering, control circuits, and protective relaying where predictable performance is essential.

Importance in practice

In practice, IEEE C57.13.5-2019 helps reduce uncertainty in how instrument transformers are designed and tested for high-voltage service. Clear performance and test requirements support safer system integration, better consistency between products, and more reliable measurement results. For procurement and compliance teams, it offers a defined benchmark that can simplify specification review and acceptance testing. For engineers, it can help manage risk by aligning equipment capabilities with the demands of transmission-level applications and associated accuracy expectations.

• Instrument transformer performance criteria
• Test requirements for 115 kV and above
• High-voltage measurement and protection use
• Utility and substation application focus
• Compliance and acceptance testing support