IEEE C37.71-1984 pdf free.IEEE Standard for Three-Phase, ManuallyOperated Subsurface Load InterruptingSwitches for Alternating-Current Systems.
IEEE C37.71 applies to three-phase, group operated,60 Hz, subsurface, load interrupting switches with maximumratings of 600 A and 38 kV, and utilizing separable insulated connectors.
When the following standards referred to in this document are superseded by a revision, the latest revision shal apply.[1]ANSI C37.85-1972 (R1978),American National Standard Safety Requirements for X-Radiation Limits for ACHigh-Voltage Power Vacuum Interrupters Used in Power Switchgear.1
[2]ANSIC57.12.26-1975,American National Standard Requirements for Pad-Mounted Compartmental-Type, Self-Cooled,Three-Phase Distribution Transformers for Use with Separable Insulated High-Voltage Connectors,High-Voltage; 24940 Grd Y/14,400 Volts and Below; 2500 kVa and Smaller.
[3]ANSI/IEEE Std 4-1978,Standard Techniques for High-Voltage Testing.
[4]ANSIIEEE Std 386-1977, Separable Insulated Connectors for Power Distribution Systems Above 600 v.
[5]ANSIIEEE Std 454-1973(R1979)，Recommended Practice for the Detection and Measurement of PartialDischarges (Corona) During Dielectric Tests.
[6]ANSIIEEEC37.09-1979, Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a SymmetricalCurrent Basis.
[7]ANSI/IEEE C37.100-1981，IEEE Standard Definitions for Power Switchgear.
The definitions of terms contained in this standard, or in other standards referred to in this document, are not intendedto embrace allthe legitimate meanings of the terms. They are applicable only to the subject treated in this standard.Foradditional definitions see ANSI/IEEE C37.100-1981[7].2
bus: (as used in this standard). A three-phase junction common to two or more ways.
subsurface switch:A submersible switching assembly suitable for application in a below-grade enclosure that doesnot allow space for personnel access.
surface operable: A term indicating that the switch and its accessories are operable from above grade.way: A three-phase circuit entrance to a switching assembly.switched way: A way connected to the bus through a three-pole, group operated switch.tapped way: A way solidly connected to the bus.
NOTE — For clarification of definitions, see Fig 1.
Switches may be applied at altitudes higher than 3300 ft (1000 m).However, the basic impulse insulation level andrated maximum voltage of air insulated switches shall be multiplied individually by the correction factor shown inTable 1, column (3), to obtain values at which the application may be made.
In addition, the continuous current rating shall be multiplied by the correction factor shown in Table 1, column (4).However,switches designed for standard temperature rise may be used at normal current rating without exceedingtotal temperature limits, provided that the upper ambient temperature does not exceed the ambient allowed in 3.1multiplied by the factor shown in Table 1, column (5).(Other ratings are not affected by altitude.)IEEE C37.71 pdf download.