Surge protection

The IEEE Standards Association has approved a new standard for surge protective equipment for AC rotating machinery rated at 1 KV or greater.

The IEEE Standards Association (IEEE-SA) has approved a new standard for surge protective equipment for AC rotating machinery rated at 1 KV or greater.

It also has approved the start of work on new standards for distribution and power external fuses; high-voltage, current-limiting motor-starter fuses; and automatic circuit reclosers and fault interrupters.

The new standard, IEEE C62.21, ‘Guide for the Application of Surge Voltage Protective Equipment on AC Rotating Machinery 1000V and Greater,’ concerns equipment such as surge arrestors, capacitors, resistors, inductors, and cable and conduit grounding used to protect ac motors and generators rated at 1000V or more in electric utility systems.

It incorporates recent knowledge about insulation and other materials and the response of machine windings to voltage surges.

IEEE-SA also approved the start of three standards. The first is IEEE PC37.43, ‘Standard Specifications for High-Voltage Expulsion, Current-Limiting and Combination Type Distribution and Power Class External Fuses, With Rated Voltages from 1 through 38Kv, Used for the Protection of Shunt Capacitors.’

This standard will set specifications for protecting shunt capacitors complying with IEEE 18 and NEMA CP-1 through the use of high voltage (above 1 KV) distribution and power class expulsion, current-limiting and combination external capacitor fuses and accessories on AC systems.

The second new standard, IEEE PC37.53.1, ‘Standard Conformance Test Procedures for High-Voltage Current-Limiting Motor-Starter Fuses With Rated Voltages from 1 Through 38 kV,’ will bring ANSI C37.53.1-1989 in line with current requirements for high-voltage switches. It will cover conformance test procedures for AC high-voltage motor-starter fuses used as back-up, current-limiting fuses with high-voltage Class E2 motor starters.

The third new standards project, IEEE PC37.60 -2003/Cor 1-200x, ‘Standard Requirements for Overhead Pad-Mounted, Dry Vault, and Submersible Automatic Circuit Reclosers and Fault Interrupters for Alternating Current Systems Up to 38 kV,’ will correct editorial and technical errors this standard before it is submitted to the IEC for dual logo status.

The IEEE-SA also reaffirmed IEEE C37.11-1997, ‘IEEE Standard Requirements for Electrical Control for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current.’