IEEE PC37.110/D5, Oct 2022 is a draft guide focused on the application of current transformers used for protective relaying purposes. In the context of power, energy, and industry applications, it addresses how current transformers support accurate relay inputs so protection systems can respond correctly under fault and abnormal conditions. IEEE PC37.110/D5, Oct 2022 is relevant when engineers need guidance on transformer selection, application, and performance considerations that affect protection scheme reliability.

IEEE PC37.110/D5, Oct 2022 overview

This technical document is centered on current transformer use in protective relaying, where measurement accuracy and response characteristics can directly influence system protection. It typically helps frame how current transformers should be applied to support relays in power system environments, including considerations tied to burden, ratio performance, and operating behavior. As a draft guide, IEEE PC37.110/D5, Oct 2022 is useful for reviewing application expectations before final design, procurement, or specification decisions.

Typical use cases

This standard is commonly consulted for substation protection, feeder and line relay applications, and other electrical systems that rely on current transformers to provide inputs to protective relays. It can support engineering work on transformer sizing, relay compatibility, and review of protection schemes in utility and industrial power installations. IEEE PC37.110/D5, Oct 2022 may also be useful during equipment selection or documentation checks where current transformer performance needs to align with relay requirements.

Why this standard matters

Protective relaying depends on current transformers that behave predictably under normal and fault conditions. Guidance such as IEEE PC37.110/D5, Oct 2022 helps reduce application errors that could affect relay accuracy, coordination, or fault response. For designers, specifiers, and test teams, it supports more consistent engineering decisions and clearer procurement requirements. That can improve protection reliability, lower the risk of misapplication, and help align equipment selection with expected operating conditions.

• Current transformer application for protective relays
• Relay input accuracy and burden considerations
• Protection scheme design and review
• Substation, feeder, and line applications
• Draft guidance for engineering and procurement checks