IEEE Approves Revised Standards For Interrupter Switches, Network Protectors, Surge Protectors

Source: IEEE

Piscataway, NJ - The IEEE has approved three revised electric power-related standards for ac interrupter switches, secondary network protectors and low-voltage surge protectors. It also has begun work on new standards for high-voltage circuit breakers and low-voltage power circuit breaker switchgear, as well as revisions to standards for high-voltage power circuit breakers, grounding devices, and neutral grounding in electrical utility systems.

The revision of IEEE 1247(TM), "Standard for Interrupter Switches for Alternating Current, Rated Above 1000 Volts", corrects technical errors in this document, which covers the basic requirements of ac switching devices, interrupters and interrupter switches used indoors, outdoors and in enclosures.

IEEE C57.12.44(TM), "Standard Requirements for Secondary Network Protectors", was updated. This standard addresses the performance, safety, and electrical and mechanical interchangeability of the low-voltage (600 V and below) network protectors that automatically connect and disconnect network transformers from secondary spot or grid networks.

IEEE C62.42(TM), "Guide for the Application of Component Surge-Protective Devices for Use in Low-Voltage (Equal to or Less Than 1000 Vrms or 1200 Vdc) Circuits", was expanded to include component varistors and avalanche junction semiconductor surge-protective devices. The prior version had only included component air gap and gas tube surge protective devices.

Work was begun on IEEE PC37.09b(TM), "Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis -- Amendment 2: Transient Recovery Voltage Requirements During Power Tests". This amendment will revise transient recovery voltage (TRV) requirements for power tests in order to coordinate the standard with revisions to IEEE C37.04(TM) and to harmonize IEEE TRV requirements during power tests with those in IEC 62271-100.

Work was also begun on IEEE PC37.20.1b(TM), "Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear -- Amendment 2: Additional Requirements for Control and Auxiliary Power Wiring in dc Traction Power Switchgear". This amendment will address input on the standard from users, specifiers and manufacturers of dc traction power switchgear. Rectifier substations incorporating such switchgear supply power for rail transportation.


The IEEE has also begun to revise three standards:

  • IEEE PC37.17(TM), "Standard for Trip Systems for AC and General Purpose DC Low Voltage Power Circuit Breakers". The revision will bring this document, which was transferred from NEMA to IEEE in 2002, into compliance with formatting requirements of IEEE standards. It also will be updated to reflect current practice.
  • IEEE PC37.20.6(TM), "Standard for 4.76 kV to 38 kV Rated Grounding and Testing Devices Used in Enclosures", covers indoor, medium-voltage grounding and testing devices used in drawout, metal-clad switchgear. The standard will be revised to reflect changes in related standards and current practice and expanded to include devices having circuit breaker
    characteristics.
  • IEEE PC62.92.4(TM), "Guide for the Application of Neutral Grounding in Electrical Utility Systems, Part IV – Distribution", provides definitions and practices for grounding of single- and three-phase ac electric utility primary distribution systems with nominal voltages in the
    range of 2.4 kV to 34.5 kV.

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

    SOURCE: IEEE