IEEE PC57.13.10/7.2, Jul 2025 is a draft IEEE technical document for calibrating energized current transformers used at 34.5 kV and below. It addresses a specialized measurement and verification process for transformers that remain in service during calibration, making it relevant to power system instrumentation and field testing. By defining a consistent approach for this equipment class, IEEE PC57.13.10/7.2, Jul 2025 helps support more reliable current measurement, better comparison of results, and improved confidence in operating performance.

IEEE PC57.13.10/7.2, Jul 2025 overview

This standard focuses on the calibration of energized current transformers, with attention to applications where removal from service may not be practical. Its technical context is rooted in power, energy, and industrial electrical systems that depend on accurate transformer performance for metering, protection, and evaluation. IEEE PC57.13.10/7.2, Jul 2025 is useful where controlled calibration methods are needed to assess transformer behavior under energized conditions and to support consistent test practice for systems operating at 34.5 kV and below.

Typical use cases

This document is commonly relevant when utilities, industrial facilities, or testing teams need to verify current transformers installed in live electrical equipment. It may be used for calibration planning, acceptance checks, maintenance testing, and periodic performance verification of energized current transformers in distribution or substation environments. IEEE PC57.13.10/7.2, Jul 2025 is also a practical reference for engineers working on instrumentation accuracy, protection circuit reliability, and field workflows where shutdowns are limited or undesirable.

Why this standard matters

Accurate current transformer calibration is important because these devices influence metering, relay operation, and system assessment. A clear standard helps reduce variation in test methods, improve consistency between organizations, and support more dependable procurement and compliance decisions. IEEE PC57.13.10/7.2, Jul 2025 also helps limit risk when working with energized equipment by encouraging a defined technical approach. For teams responsible for electrical performance and verification, it provides a focused basis for repeatable and defensible calibration practice.

• Energized current transformer calibration
• 34.5 kV and below applications
• Power system measurement and verification
• Field testing and maintenance workflows
• Instrumentation and protection performance