IEEE C37.38:1989 pdf download.IEEE Standard for Gas-Insulated, Metal-Enclosed Disconnecting, Interrupter,and Grounding Switches.
IEEE C37.38 applies to switches rated 72.5 kV and above intended for use in metal-enclosed, gas-insulated substations, including disconnecting, interrupter, and grounding switches. These switches are characterized by grounded. leak-tight metal enclosures that are filled with a gas (most commonly sulfur hexa-fluoride, SF6) at some pressure above atmospheric, with live parts contained within the housing and insulated therefrom by the gas and by suitable solid insulation that supports the live parts in their proper position. Gas-insulated switches are normally electrically connected to and structurally joined to other gas-insulated components such as buses, gas-to-air bushings. circuit breakers, instrument transformers, cable terminations, etc. Switches may he manually or power operated.
1.2 References
The following publications shall he used in conjunction with this standard. When standards in this document are referred to, the latest revision shall apply.
[1] ANSI C2- 1990, National Electrical Safety Code.
[2] ANSI C37.33-1987, Switchgear—High-Voltage Air Switches—Rated Control Voltages and Their Ranges.
[3] ANSI C63.2-1987, American National Standard for Instrumentation—Electromagnetic Noise and Field Strength, 10 kHz to 40 GHz——Specifications.
[4] ANSI MC96.1-1982, Temperature Measurement Thermocouples.
[5] ANSI/ASME 1989, Boiler and Pressure Vessel Code, Section Viii (Pressure Vessels). Division 1.2
[6] ANSI/ASME B3 1.1-1986, Power Piping.
[7] ANSI/IEEE C37.0l0-1979, IEEE Application Guide for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis.
[8] ANSI/IEEE C37.04-1979, IEEE Standard Rating Structure for AC High-Voltage Circuit Breakers Rated on Symmetrical Current Basis.
[9] Draft ANSI/IEEE C37.24-1986, IEEE Guide for Evaluating the Eftct of Solar Radiation on Outdoor Metal- Enclosed Switchgear.
[10] ANSI/IEEE C37.30-1971 (R1977), American National Standard Definitions and Requirements for High-Voltage Air Switches, Insulators, and Bus Supports (includes Supplement C37.30a- 1975).
[11] ANSI/IEEE C37.34-1971 (R1977), American National Standard Test Code for High-Voltage Air Switches.
[12] ANSI/IEEE C37.100-l981, IEEE Standard Definitions for Power Switchgear.
[13] ANSI/IEEE C37. 122-1983, IEEE Standard for Gas Insulated Substations.
1141 ANSI/IEEE Std 4-1978, IEEE Standard Techniques for High-Voltage Testing.
[15] ASTM D2472- 1971 (R 1980), Standard Specification for Sulfur Hexafluoride.
[16] IEEE Std 119-1974, IEEE Recommended Practice for General Principles of Temperature Measurement as Applied to Electrical Apparatus.
2. Definitions
The definitions in this section establish the meanings of words in the context of their use in this document. Other terms shall he defined in accordance with ANSI/IEEE C37.100-1987 [121 and other ANSI standards referenced in the text
design pressure: The maximum gas pressure to which a gas-insulated substation enclosure will be subjected under normal operating conditions. This is the result of the nominal gas density at initial filling plus ambient and current loading effects.
enclosure: The grounded metal part surrounding the gas-insulated switch, used to retain the pressurized gas under the prescribed conditions necessary to maintain the insulation level safely. The enclosure prevents personnel from inadvertently approaching live or moving parts contained therein and protects the internal components of the equipment against external effects.
enclosure currents: Currents that result from the voltages induced in the metallic enclosure by effects of currents flowing in the enclosed conductors.
gas barrier insulator: An insulator specifically designed to prevent passage of gas from one side to its other.IEEE C37.38 pdf download.