IEEE C37.110-1996

IEEE C37.110-1996 is a technical guide for the application of current transformers used for protective relaying purposes in power, energy and industry applications. It helps engineers evaluate how current transformers should be selected and applied so protective relays receive reliable current information. For substations, industrial power systems, and other relay-protected networks, the document supports better design decisions, more consistent performance, and lower risk of measurement or protection errors.

What is IEEE C37.110-1996?

This standard is a practical engineering guide focused on current transformers that feed protective relaying circuits. IEEE C37.110-1996 addresses the application side of current transformer use, helping users understand how CT characteristics affect relay operation, burden, accuracy, and overall protection performance. It is especially relevant when specifying or reviewing protection schemes, since the guide can help align current transformer selection with the intended relay duty and system conditions.

Where is IEEE C37.110-1996 used?

IEEE C37.110-1996 is commonly used in power-system protection work involving substations, switchgear, feeder protection, transformer protection, and other relay-based control schemes. It is relevant wherever current transformers are installed to provide input to protective relays in utility, industrial, and power-distribution environments. The guide is useful for engineering teams, protection specialists, and procurement staff who need to match CT application details with the requirements of the relay system.

Why is IEEE C37.110-1996 important?

The value of IEEE C37.110-1996 lies in reducing application mistakes that can affect protection reliability. Proper current transformer application helps improve relay accuracy, avoid saturation-related issues, and support consistent fault detection. For specification and design review, the guide offers a reference point for comparing CT performance against protective-relaying needs. That makes it useful for compliance checks, equipment selection, and risk reduction in critical power applications.

• Current transformer application guidance
• Protective relaying focus
• Power and industry system use
• Relay burden and performance considerations
• Superseded IEEE technical document