April 13, 2015 © S&C Electric Company 2014-2015, all rights reserved Photo Sheet 695 -700

S&C Vista® SD Underground Distribution SwitchgearOutdoor Distribution (17.5 kV and 29 kV)

With Visi-Gap™ Load-Interrupter Switches and Visi-Gap™ Fault Interrupters — Vault Installation Style

S&C Vista SD Underground Distribution Switchgear features load-interrupter switches for switching 600-ampere main feeders, and microprocessor-controlled fault interrupters for the switching and protection of 600-ampere main feeders and 200- or 600-ampere taps, laterals, and sub-loops. These elbow-connected components are encapsulated in an environmentally friendly solid-dielectric insulating material. Vista SD Switchgear is available in ratings through 29 kV and 16 kA symmetrical interrupting.

Vista SD Underground Distribution Switchgear is considerably smaller than traditional air-insulated gear; it can be installed exactly where it’s needed. It’s completely submersible and thus suitable for installation in subsurface vaults subject to flooding. Single-way Vista SD assemblies are ideally suited for application on the primary side of network transformers. Multi-way assemblies, from three to six load-interrupter switches or fault interrupters, are also available.

Single-way Vista SD switchgear is ideally suited for use on the primary side of network transformers. Model 101 (fault interrupter) shown.

Multi-way Vista SD switchgear can be used in submersible vaults with multiple source ways and/or multiple protected ways (taps).

S&C Visi-Gap load-interrupter switches utilize a vacuum interrupter in series with a manually operated two-position isolating disconnect, for three-pole live switching of 600-ampere three-phase circuits. Load-interrupter switches comply with IEEE Standard 1247 and IEC Standard 62271-103. They feature an easy-to-operate manual operating mechanism.

S&C Visi-Gap fault interrupters utilize a vacuum interrupter in series with manually operated two-position isolating disconnect, for three-pole load switching of 200- or 600-ampere circuits and fault interrupting through 16 kA symmetrical at 17.5 kV and through 12.5 kA symmetrical at 29 kV. Fault interrupters comply with both IEEE Standard C37.60 and IEC Standard 62271-111.

Load-interrupter switches and fault interrupters can be directly opened and closed using the manual handle furnished. Opening and closing speed is not dependent upon the speed with which the handle is moved. Operating shafts are padlockable in either position.

Introducing the industry’s f irst practical solid- dielectric switchgearwith a visible open gap and f ield- replaceable bushings

S&C Vista® SD Underground Distribution Switchgear

Load-interrupter switches and fault interrupters can be directly operated using the manual handle provided, or from the side using a rope, or with a shotgun stick.

Factory-installed and wired motor operators, to facilitate remote power operation of load-interrupter switches and fault interrupters, are optionally available. They can be decoupled from the operating mechanisms to permit testing without changing the positions of the switches or fault interrupters. The motor operators require a user-furnished 100-240 Vac 50/60-Hz control power source.

Motor operators can be factory- or user-installed and facilitate remote operation of load-interrupter switches and fault interrupters.

The motor operators are controlled by an accessory cable-connected (25- or 50-feet length) portable remote control pendant, featuring “Open/Reset” and “Close” push buttons, operator- and isolating-disconnect position-indicating lamps, and lamp test button. The portable remote control pendant is fully submersible.

Easy-to-follow mimic bus and indicators on the front of the switchgear convey the positions of the load-interrupter switches and fault interrupters (and their isolating disconnects), and if a fault interrupter has tripped on a fault. The default color scheme is green for “Open/Reset”

and red for “Closed.” To reverse these colors (i.e., green for “Closed” and red for “Open/Reset”), specify Catalog Number Suffix “-J1.”

Mimic bus and indicators convey positions of load-interrupter switches and fault interrupters (and their isolating disconnects).

Large viewing windows provide a clear view of the isolating disconnects, allowing operating personnel to easily confirm the positions of load-interrupter switches and fault interrupters.

Open Closed

Visible open gap provided by isolating disconnect is easy to see through large viewing windows.

Terminals are equipped with field-replaceable 600-ampere-rated bushing adapters. Fault interrupters may be optionally equipped with 200-ampere bushing well adapters in lieu of 600-ampere bushing adapters. Bushing and bushing-well adapter interfaces conform to IEEE Standard 386, and accept all standard insulated connectors and inserts.

The self-powered overcurrent control can be programmed using a personal computer connected to the control through an adapter cable. The control features a variety of fuse and relay time-current characteristic (TCC) curves that comply with IEEE Standard C37.112.

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S&C Vista® SD Underground Distribution Switchgear

Ratings: IEEE IEC

kV, System Class 15 27 12 24

kV, Maximum 17.5 29 12 24

kV, BIL 95 125 75 125Amperes, Continuous, Main Bus 600 600 630 630Load-Interrupter Switches

Amperes, Continuous 600 600 630 630Amperes, Load Splitting and Load Dropping❶ 600 600 630 630Amperes, RMS, Symmetrical Momentary and One-Second 16 000 16 000 16 000 16 000Amperes, RMS, Symmetrical Fault Closing, Three Time❷ 16 000 16 000 16 000 16 000

Fault InterruptersAmperes, Continuous❸ 600 600 630 630Amperes, Load Splitting and Load Dropping❶❸ 600 600 630 630

Amperes, RMS, Symmetrical, Interrupting 16 000■ 12 500 16 000■ 12 500

Short-Circuit Rating

Amperes, RMS, Symmetrical 16 000■ 12 500 16 000■ 12 500

❶ Parallel or loop switching.❷ Applicable to fault closing into closed position.

❸ 200 amperes if fault interrupters are furnished with optional 200-ampere bushing wells.

■ 12,500 amperes if fault interrupters are furnished with optional 200-ampere bushing wells.

Ground bus(optional)

Visible open gap(isolating disconnect) is easy to see through large viewing windows

Parking stands(optional)

600-A bushing adaptersare field replaceable

Overcurrent control

Operating mechanism

Voltage indication feature (optional)

CT

Vista SD Switchgear has the features and options needed to match user needs. Wet-vault mounted style shown with cables at top, operating mechanism at bottom (Catalog Number Suffix “-V1”).

S&C Photo Sheet 695-700 3