Data Sheet 695-93 [English, 502 KB, 8/10/2015]

Data Sheet 695-93 [English, 502 KB, 8/10/2015]
S&C Vista® SD Underground Distribution Switchgear
Outdoor Distribution (17.5 kV and 29 kV)
With Visi-Gap™ LoadInterrupter Switches and
Visi-Gap™ Fault Interrupters
Specifications for S&C Potential Indication Feature
This data sheet provides specifications for S&C Vista SD
UDS potential indication feature (Catalog Number Suffix
“-L2”). The potential indication feature consists of a
capacitive tap molded inside the bushing or bushing well.
The capacitive tap transforms the system voltage down at
a 2400:1 ratio to a level measurable with a high-impedance
true RMS-reading voltmeter set to read ac volts. For
instructions on using the potential indication feature, please
refer to Instruction Sheet 695-510.
To Phase 2
High-voltage
conductor
1
Cypoxy
dielectric
material
Bushing or Bushing Well
2
3
To Phase 3
N
Embedded
capacitive screen
Figure 1. Schematic of Vista SD potential indication feature (Phase 1 shown).
Potential Indication Output
System Voltage
Nominal (kV)
Checking for Voltage, Single-Way ①
Phase-Neutral Voltage
(V)
Phase-Phase Voltage
(V)
Low-Voltage Phasing②
Phase-Phase Voltage,
Corresponding
Phases
(2° Shift) (V)
Phase-Phase Voltage,
Corresponding
Phases
(30° Shift) (V)
Phase-Phase Voltage,
Different Phase (V)
4
0.962
1.667
0.135
0.599
1.843
10
2.406
4.167
0.339
1.499
4.608
12.47
3.000
5.196
0.423
1.869
5.747
13.2
3.175
5.500
0.448
1.979
6.083
17.5
4.210
7.292
0.584
2.491
8.065
20
4.811
8.333
0.678
2.997
9.217
23
5.533
9.583
0.779
3.446
10.599
25
6.014
10.417
0.847
3.746
11.521
27.6
6.640
11.500
0.935
4.136
12.719
29
6.976
12.083
0.982
4.345
13.364
①Accuracy of the potential indication feature for a single potential indicator is ±8%.
August 10, 2015
© S&C Electric Company 2015, all rights reserved
②Accuracy of the potential indication feature when performing low-voltage phasing tests is ±5.3%.
Data Sheet 695-93
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