IEEE Approves And Revises Standards For Energy Transmission

Piscataway, NJ - The IEEE has approved one new standard and two revised standards related to energy transmission.

The new standard is IEEE C57.12.38, "Standard for Padmounted Type, Self-Cooled, Single Phase Distribution Transformers; High Voltage, 34 500 GrdY/19 920 Volts and Below, Low Voltage, 240/120 Volts; 167 kVA and Smaller." The standard covers certain electrical, dimensional, and mechanical characteristics and takes into consideration certain safety features of single-phase, 60 Hz., mineral-oil-immersed, self-cooled, pad-mounted, compartmental-type distribution transformers. These transformers are rated 167 kVA and smaller, with high voltages of 34 500 GrdY/19 920 volts and below, and with low voltages of 240/120 volts. These transformers are generally used for step-down purposes from an underground primary cable supply. This standard covers the connector, bushing and terminal arrangements for radial or loop feed systems.

IEEE C57.13.5, "Standard of Performance and Test Requirements for Instrument Transformers of a Nominal System Voltage of 115 kV and Above," has been revised to replace the 2003 standard. It applies to single-phase instrument transformers of a nominal system voltage of 115 kV and above with capacitive insulation system for line-to-ground connection and for both indoor and outdoor application. This standard is intended for use as a supplement to IEEE Std C57.13 and as a basis for performance and safety of equipment.

The revision to IEEE C57.15, "Standard Requirements, Terminology, and Test Code for Step-Voltage Regulators," replaces the 1999 version of the standard. It provides descriptions to design types, tables of 50 and 60 Hz ratings, supplementary ratings, construction and available accessories. The standard covers resistance measurements, polarity tests, power factor and megger tests, ratio tests, no load loss and excitation current measurements, impedance and load loss measurements, dielectric tests, temperature tests, routine and design impulse tests, short-circuit tests, control tests, calculated data and certified test data.

SOURCE: IEEE