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Data Sheet 821-300

The document provides allowable continuous-current capabilities for S&C Loadbuster Disconnect Switches for outdoor transmission between 14.4 kV and 34.5 kV. It lists the current capabilities in amps for different voltage ratings, ambient temperatures, and wind velocities.

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68 views

Data Sheet 821-300

The document provides allowable continuous-current capabilities for S&C Loadbuster Disconnect Switches for outdoor transmission between 14.4 kV and 34.5 kV. It lists the current capabilities in amps for different voltage ratings, ambient temperatures, and wind velocities.

Uploaded by

airtupas
Copyright
© © All Rights Reserved
Available Formats
Download as PDF, TXT or read online on Scribd
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S&C Loadbuster Disconnect® Switches Allowable Continuous-Current

Outdoor Transmission (14.4 kV through 34.5 kV) Capability

The allowable continuous-current capabilities of S&C is a qualitative appraisal of the ability of a sample switch in
Loadbuster Disconnect Switches, listed below, were new condition to perform properly after once carrying 180%
determined from temperature rise tests conducted according of rated current for 8 hours, at an ambient temperature of
to the requirements of IEEE Standard C37.34-1994 and equal 25° C or higher. It is not intended that installed switches be
or exceed the minimum loadability requirements specified intentionally subjected in service to such overloads on a
therein. The values below are based on an allowable repetitive basis since, as the standard points out, cumulative
maximum temperature of 90° C at the terminal pads. overloading of hard-drawn copper (as is typically used in
As a point of information, overload capabilities of switch blades) causes cumulative annealing. As the standard
switches cannot be determined from the “switch perfor- further points out, the switch performance test does not
mance test” specified in IEEE Standard C37.34-1994, which establish an overload rating.

Rating
Amperes, kV, Allowable Continuous-Current Capability, Amperes
Cont. Nominal
Ambient Temperature, Degrees C 0 10 20 30 40
Wind Velocity, Feet per Second 0 2 0 2 0 2 0 2 0 2

14.4
630 1055 1180 995 1125 930 1070 860 1015 785 930
25
14.4
25
900 1300 1425 1225 1355 1145 1285 1060 1215 970 1115
25/34.5
34.5

June 29, 2015


© S&C Electric Company 1982-2015, all rights reserved Data Sheet  821-300

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