IEEE PC57.13.5/D6, May 2009 is a draft technical standard for instrument transformers used on nominal system voltages of 115 kV and above. It addresses performance and test requirements that help define how these high-voltage devices should be evaluated for power-system service. For utilities, manufacturers, and test engineers, this document is relevant because it supports consistent design expectations, procurement decisions, and compliance-oriented testing in high-voltage energy applications.

Overview of IEEE PC57.13.5/D6, May 2009

This draft standard focuses on instrument transformers intended for high-voltage power systems, where measurement accuracy, insulation coordination, and dependable performance are critical. IEEE PC57.13.5/D6, May 2009 provides a framework for assessing these devices under conditions typical of 115 kV and above, helping align product design with testing practices. As a technical document, it is useful when specifying transformer performance, reviewing test methods, or comparing equipment for transmission and substation applications.

Typical use cases

This standard is typically referenced in the specification and evaluation of current transformers and voltage transformers used in transmission substations, metering installations, and protection schemes. It may also be used during factory testing, acceptance review, and procurement of instrument transformers for high-voltage switchyards. In engineering workflows, IEEE PC57.13.5/D6, May 2009 helps teams compare design claims against testable requirements for systems operating at 115 kV and above.

Why it matters

For high-voltage instrumentation, clear performance and test requirements reduce the risk of mismatched equipment, measurement errors, and insulation-related issues. IEEE PC57.13.5/D6, May 2009 supports more consistent compliance checks and gives buyers and engineers a common basis for evaluating products. In practice, that can improve procurement confidence, testing consistency, and long-term reliability in power and energy applications where instrument transformers play a critical monitoring and protection role.

• Instrument transformers for 115 kV and above
• Performance and test requirements
• High-voltage power-system applications
• Substation and transmission equipment
• Specification and compliance review