PISCATAWAY, N.J., USA, 12 April 2005 The IEEE
has begun work on a new standard for surge voltage
protection in ac rotating machinery. It also began
revisions to existing standards for surge protection
in power plants, motor control centers in nuclear
power plants and pad-mounted transformers.
The IEEE began to develop IEEE PC62.21.1(TM), "Recommended
Practice for the Application of Surge Voltage Protective
Equipment on AC Rotating Machinery Rated 1000 V or
Greater and Less than 30 kV, Generators and Single-Turn
Coil Motors". This new standard will provide
guidance in selecting and applying surge protective
devices to protect or extend the life of rotating
generators, both with and without generator circuit
breakers, as well of single-turn coil motors.
The first of the standards being revised is IEEE
PC62.23(TM), "Application Guide for Surge Protection
of Electric Generating Plants", which is being
updated to encompass the latest technology. This standard
looks at how to reduce surges and protect indoor and
outdoor equipment, controls and communication systems.
It is designed to help engineers decide if plants
and parts of plants need protection from lightning
and switching surges and provides guidance in selecting
and applying surge protective devices.
The second revision project is for IEEE P649(TM),
"Standard for Qualifying Class 1E Motor Control
Centers for Nuclear Power Generating Stations".
This update will add information on current technology,
including solid-state equipment, and address comments
received on the standard. IEEE P649 describes the
basic principles, requirements and methods for qualifying
Class 1E motor control centers for both mild and harsh
environments.
The third revision project is for IEEE PC57.12.34(TM),
"Requirements for Pad-Mounted, Compartmental
Type, Self Cooled; Three Phase Distribution Transformers,
5 MVA and Smaller; High Voltage, 34.5kV Nominal System
Voltage and Below; Low Voltage, 15kv Nominal System
Voltage and Below".
The revision will accommodate a number of end-use
changes, such as the trend toward increasing transformer
size from 2.5 MVA to 5 MVA. This standard covers connectors,
bushings and terminal arrangements for radial or loop-feed
systems in these transformers, which are most often
found in step-down service from an underground primary
cable supply.
The IEEE also reaffirmed the continued use of three
standards:
IEEE 62(TM), "Guide for Diagnostic Field
Testing of Electric Power
Apparatus - Part 1: Oil Filled Power Transformers,
Regulators, and
Reactors",
IEEE C37.20.2(TM), "IEEE Standard for Metal-Clad
Switchgear", and
IEEE 845(TM), "IEEE Guide for the Evaluation
of Human-System
Performance in Nuclear Power Generating Stations".
The above standards are sponsored by the IEEE Power
Engineering Society.
About the IEEE Standards Association
The IEEE Standards Association, a globally recognized
standards-setting body, develops consensus standards
through an open process that brings diverse parts
of an industry together. These standards set specifications
and procedures based on current scientific consensus.
The IEEE-SA has a portfolio of more than 870 completed
standards and more than 400 standards in development.
For information on IEEE-SA see: http://standards.ieee.org/.
About the IEEE
The IEEE has more than 360,000 members in approximately
175 countries. Through its members, the organization
is a leading authority on areas ranging from aerospace,
computers and telecommunications to biomedicine, electric
power and consumer electronics. The IEEE produces
nearly 30 percent of the world's literature in the
electrical and electronics engineering, computing
and control technology fields. This nonprofit organization
also sponsors or cosponsors more than 300 technical
conferences each year. Additional information about
the IEEE can be found at http://www.ieee.org.
IEEE PC62.21.1, PC62.23, P649,
PC57.12.34, 62, C37.20.2, and 845 are trademarks of
the IEEE. All other names or product names are the
trademarks, service marks or registered trademarks
of their respective holders.
