S&C Vista SD User Manual

28 S&C Instruction Sheet 695-510
Vista SD
Underground
Distribution
Switchgear Ratings
Table 4. Vista SD Switchgear Ratings
①
Voltage, kV Amperes, RMS
System Class Max BIL
Main Bus
Continuous Current
Short-Circuit,
RMS, Sym.
15
(12)
1 7. 5
(12)
95
(75)
600
(630)
16 000
★
27
(24)
29
(24)
125
(125)
600
(630)
12 500
① IEEE ratings are given first, with the IEC ratings
in parentheses.
★
12 500 amperes if fault interrupters are furnished
with optional 200-ampere bushing wells in lieu of
600-ampere bushings.
Ratings for S&C
Visi-Gap Load-
Interrupter Switches
Complete ratings for Visi-Gap load-interrupter switches are shown in Table 5. Besides the
load-dropping ratings shown, the switches are capable of interrupting transformer magnetizing
currents associated with the applicable loads as well as line-charging and cable-charging
currents typical for distribution systems of these voltage ratings. For applications involving
load currents with high harmonic content (such as rectier load currents), refer to the nearest
S&C Sales Ofce. The duty-cycle fault-closing rating shown for the switch denes the ability
to close the switch into the Closed position the designated number of times against a three-
phase fault equal to the rated value, with the switch remaining operable and able to carry
and interrupt rated current.
Table 5. Vista-Gap Load-Interrupter Switch Ratings
Applicable
Standard
Freq.,
Hertz
Visi-Gap Load Interrupter Switches
Voltage, kV Amperes
Nom. Max BIL
Continuous, Load
Dropping, and
Load Splitting①
Momentary and
One-Second,
Short-Time
Withstand, RMS,
Symmetrical
Three-Time
Duty Cycle Fault
Making, RMS,
Symmetrical②
IEEE 60
15 1 7. 5 95 600 16 000 16 000
27 29 125 600 16 000 16 000
IEC 50
12 12 75 630 16 000 16 000
24 24 125 630 16 000 16 000
① Parallel or loop switching. ② Applicable to fault closing into the Closed
position.
Ratings for S&C
Visi-Gap Fault
Interrupters
Complete ratings for Visi-Gap fault interrupters are shown in Table 6. Besides the load-dropping
ratings shown, the fault interrupters are capable of interrupting transformer magnetizing
currents associated with the applicable load as well as line-charging and cable-charging
currents typical for distribution systems of these voltage ratings.
Table 6. Visi-Gap Fault Interrupter Ratings
Applicable
Standard
Freq.,
Hertz
Visi-Gap Fault Interrupters
Voltage, kV Amperes
Nom. Max BIL
Continuous, Load Dropping,
and Load Splitting①
Short-Circuit Interrupting,
RMS, Symmetrical
IEEE 60
15 1 7. 5 95 600
16 000
★
27 29 125 600 12 500
IEC 50
12 12 75 630
16 000
★
24 24 125 630 12 500
① 200 amperes if the fault interrupters are
furnished with optional 200-ampere bushing wells.
★
12 500 amperes if the fault interrupters are
furnished with optional 200-ampere bushing wells
in lieu of 600-ampere bushings.
Appendix B

S&C Vista SD Specifications

General

Brand	S&C
Model	Vista SD
Category	Switch
Language	English