IEEE approves three transformer standards and begins work on two others

PISCATAWAY, N.J., July 17, 2002 — The Institute of Electrical and Electronics Engineers Standards Association (IEEE-SA) Standards Board has approved the new standard, IEEE C57.123, “Guide for Transformer Loss Measurement,” as well as two revised transformer standards that involve underground transformers and insulating oil. The board also approved the start of work on two new standards projects.

IEEE PC57.123 is a guide to the instrumentation, circuitry, calibration and measurement methods used in evaluating no-load and load losses and excitation current in power and distribution transformers. It provides supplemental information for tests in the test code, IEEE C57.12.90-1993.

The two revised standards approved are:

IEEE PC57.12.23, “Standard for Underground Type, Self-Cooled, Single-Phase, Distribution Transformers with Separable Insulated High-Voltage Connectors; High Voltage 25000 V and Below; Low Voltage 600 V and Below; 167 kVA and Smaller,” expands the scope of the existing standard by adding ratings of 25,000 V and below and 600 V and below.

IEEE PC57.106, “Guide for Acceptance and Maintenance of Insulating Oil in Equipment,” recommends analytical test and evaluation procedures for the acceptance and use of the petroleum (mineral) dielectric oils contained in transformers, voltage regulators, switchgear, reactors, circuit breakers and load tap changers.

The Board also approved the start of the following two standards

IEEE PC57.12.36, “Standard Requirements for Liquid-Immersed Distribution Substation Transformers,” will be the first standard to provide adequate requirements for 50 and 60 Hz systems rated at 10,000 kVa and below three phase and 6,667 kVa and below single phase with a primary voltage of 69,000 and below and a secondary voltage of 34,500 and below. It will include issues concerned with indoor and outdoor applications, cover and wall terminations and switchgear coordination.

IEEE PC57.93, “Guide for Installation of Liquid-Immersed Power Transformers,” will update an existing standard by adding present practices.

The above standards are sponsored by the Transformer Committee of the IEEE Power Engineering Society.

The IEEE Standards Association (IEEE-SA), a global standards-setting body, develops consensus standards through an open process that brings diverse parts of an industry together. It has a portfolio of more than 870 completed standards and more than 400 in development. IEEE-SA promotes the engineering process by creating, developing, integrating, sharing and applying knowledge about electro- and information technologies and sciences for the benefit of humanity and the profession.

For further information on IEEE-SA visit: .

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