IEEE PC57.13.10/D7.1, May 2025 is a draft guide focused on calibration of energized current transformers for systems rated 34.5 kV and below. It addresses a specialized measurement task in power, energy, and industrial applications where current transformer accuracy affects monitoring, protection, and billing-related confidence. By defining a practical framework for energized calibration, IEEE PC57.13.10/D7.1, May 2025 helps support consistent field and test practices for this voltage class.

What is IEEE PC57.13.10/D7.1, May 2025?

This document is an IEEE draft guide for calibrating current transformers while they remain energized, rather than being removed from service. Its technical context is low- to medium-voltage power systems, specifically installations at 34.5 kV and below. IEEE PC57.13.10/D7.1, May 2025 is intended to guide calibration methods, test conditions, and procedural considerations that help users assess transformer performance with greater consistency. It is especially relevant where current transformer accuracy must be verified without interrupting operation.

Where is IEEE PC57.13.10/D7.1, May 2025 used?

IEEE PC57.13.10/D7.1, May 2025 is commonly applied in utility substations, industrial distribution systems, and other power installations that use current transformers for measurement or protection. It is particularly relevant to workflows involving energized equipment, field calibration, commissioning, maintenance verification, and periodic testing. In practice, the guide supports technicians, engineers, and test personnel working with current transformers serving metering circuits, protective relays, and related electrical systems at 34.5 kV and below.

Why is IEEE PC57.13.10/D7.1, May 2025 important?

Calibration guidance for energized current transformers helps reduce uncertainty when equipment cannot be taken offline. IEEE PC57.13.10/D7.1, May 2025 is important because it can support more consistent test results, better design and maintenance decisions, and improved confidence in measured current values. That matters for safety, operational continuity, and procurement or compliance activities where transformer performance must be documented and compared in a controlled way. For users of IEEE PC57.13.10/D7.1, May 2025, a clear calibration approach can also help limit avoidable measurement error.

• Energized calibration procedures
• Current transformers at 34.5 kV and below
• Field testing and verification
• Measurement accuracy and consistency
• Power and industrial applications