IEEE C57.13.2-1986

C57.13.2-1986 is an American National Standard for conformance test procedures for instrument transformers used in power, energy, and industry applications. It defines how these devices are evaluated so their performance can be checked against expected requirements for measurement and protection service. For utilities, manufacturers, and test laboratories, the standard helps support consistent verification of transformer behavior, accuracy, and suitability in electrical systems where dependable instrument transformers are important.

Overview of C57.13.2-1986

This standard focuses on conformance testing for instrument transformers, which are commonly used to scale high current or voltage values for metering and protective relaying. C57.13.2-1986 provides a technical basis for assessing whether these transformers meet defined expectations in a controlled test environment. In practice, it supports comparison of results across equipment and organizations, helping ensure that test methods are applied consistently when evaluating performance for power-system applications.

Typical use cases

C57.13.2-1986 is typically relevant when testing current transformers and voltage transformers before installation or during qualification of production units. It may be used by equipment manufacturers, utility test groups, and independent laboratories working on metering circuits, protective relay inputs, and substation instrumentation. The standard is also useful during procurement review, where buyers may need a clear reference for acceptable conformance testing of instrument transformers intended for electrical power systems.

Why it matters

Consistent conformance testing helps reduce uncertainty in instrument transformer performance, which is important for measurement accuracy and protective system reliability. By using C57.13.2-1986, organizations can better control design verification, acceptance testing, and procurement specifications. That can lower the risk of mismatched equipment, incorrect readings, or unreliable relay operation. For power and industry applications, this kind of test discipline supports safer operation and more dependable electrical system performance.

• Conformance test procedures for instrument transformers
• Applicable to metering and protective uses
• Supports utility and laboratory test workflows
• Useful for procurement and acceptance checks
• English-language superseded standard