Page 1: Table Of Contents
S&C Vista SD Underground Distribution Switchgear With Visi-Gap Load-Interrupter ® ® Outdoor Distribution (17.5 kV and 29 kV) Switches and Visi-Gap ® Fault Interrupters Installation Table of Contents Section Page Section Page Introduction Installation Qualified Persons ......2 Vault-Mounted Style Read this Instruction Sheet .
Page 2: Introduction
“–Sx” has been speci ed, where “x” is the way on which the auxiliary contacts are installed). A variety of optional features are available for S&C Vista SD Underground Distribution Switchgear. The catalog number stamped on the nameplate affixed to the unit is suffixed with letter-number combinations applicable to the gear furnished.
Page 3: Retain This Instruction Sheet
Introduction Retain this This instruction sheet is a permanent part of your S&C Vista SD Underground Distribution Switchgear. Designate a location where you can easily retrieve and refer to this publication. Instruction Sheet Proper Application WARNING The equipment in this publication must be selected for a specific application. The application must be within the ratings furnished for the selected equipment.
Page 4: Safety Information
Understanding Several types of safety-alert messages may appear throughout this instruction sheet and on labels and tags attached to your S&C Vista SD Underground Distribution Switchgear. Safety-Alert Familiarize yourself with these types of messages and the importance of these various...
Page 5: Location Of Safety Labels And Tags Single-Way Vault-Mounted Style
Safety Information Location of Safety Labels and Tags—Single-Way Vault-Mounted Style Note: The manul operating handle is stored on the mounting stand (not visible). Note: The installation and operation information kit is taped to the switchgear assembly. Designate a location where you can easily retrieve it and refer to it.
Page 6: Multi-Way Vault-Mounted Style
Safety Information Location of Safety Labels and Tags—Multi-Way Vault-Mounted Style Note: Manual operating handle is stored on mounting stand (not visible). Note: The installation and operation information kit is taped to the switchgear assembly. Designate a loca- tion where you can easily retrieve it and refer to it. Reorder Information for Safety Labels Location Safety Alert Message...
Page 7: Pad-Mounted Style
Safety Information Location of Safety Labels and Tags—Pad-Mounted Style WARNING KEEP OUT Padlock Hazardous voltage inside. Can shock, burn, or cause death. If open or unlocked, immediately call electric company. G-6398 Note: The installation and operation information kit is stored in a slot behind the manual operation handle to the left of Way 1.
Page 8: Safety Precautions
Safety Precautions DANGER S&C Vista SD Underground Distribution Switchgear operates at high voltage. Failure to observe the precautions below will result in serious personal injury or death. Some of these precautions may differ from your company’s operating procedures and rules.
Page 9: Shipping And Handling
Shipping and Handling Packing Vault-Mounted Style S&C Vista SD Underground Distribution Switchgear is shipped in a wooden crate. Pad-Mounted Style S&C Vista SD Underground Distribution Switchgear is fastened to a wood skid. At the rst opportunity, remove all packing materials (cardboard, paper, foam padding, etc.) from the switchgear assembly.
Page 10: Handling
Failure to follow this pre-caution may result in damage to the motor operator or to the switchgear assembly from contact with the hoist sling. Horizontal orientation (catalog number “-V3”) Figure 4. Hoisting a single-way vault-mounted style Vista SD switchgear assembly. S&C Instruction Sheet 695-505...
Page 11 Shipping and Handling Figure 5. Hoisting a multi-way vault-mounted style Vista SD switchgear assembly. Figure 6. Hoisting a pad-mounted style Vista SD switchgear assembly (multi-way assembly shown). S&C Instruction Sheet 695-505...
Page 12: Vault-Mounted Style Switchgear Placement
Installation Vault-Mounted Style Switchgear Placement STEP 1. At the installation site, remove all separately packaged components (if any) that were shipped with the switchgear assembly and set them aside. STEP 2. Remove switchgear assembly from its crate and lift it into place, observing the precautions given under the “Handling”...
Page 13: Single-Way Vault-Mounted Style Unit Installed Through 31½-Inch Manhole
Installation Single-Way Vault-Mounted Style Unit Installed Through 31½-Inch Manhole STEP 1. At the installation site, remove all separately packaged components (if any) that were shipped with the switchgear assembly and set them aside. STEP 2. Remove switchgear assembly from its crate. Bushing or bush- ing well adapters STEP 3.
Page 14: Cables
Installation Cables DANGER Before energizing the switchgear, replace the shipping covers on all bushings and bushing wells with elbows or insulated protective covers or caps. Failure to replace the shipping covers on all bushings with elbows or insulated protective covers or caps can result in a flashover and serious personal injury or death.
Page 15: Grounding
Installation Grounding STEP 1. Connect the ground pads on each way of the switchgear assembly to the system ground in accordance with the user’s standard grounding practice. See Figure 9 on page 14. STEP 2. If the switchgear is furnished with the continuous ground bus (catalog number suffix “-O”), connect the ground bus to the system ground in accordance with the user’s standard practice.
Page 16: Pad-Mounted Style Switchgear Placement
Installation Pad-Mounted Style Switchgear Placement STEP 1. At the installation site, remove all separately Shipping Shipping packaged components (if any) that were shipped clamp within the pad-mounted gear enclosure and set them aside. STEP 2. Unbolt the switchgear assembly from its skid lift unit onto...
Page 17 Installation STEP 3. Lift the hinged roof to approximately 45° above horizontal; the “hold-open” latching mechanism will engage automatically. See Figure 13. WARNING After lifting the roof open and ensuring the “hold- open” latching mechanism is engaged, release pressure on the hinged roof slowly. Failure to engage the “hold-open”...
Page 18: Cables
Installation Cables STEP 1. Remove the cover panels by unscrewing the pins connecting the panels to the front of the enclosure. Lift the front of each panel upwards and pull outwards to disengage the tab at the back of the panel from the slot at the bottom of the operating mechanism.
Page 19 Installation CAUTION ALWAYS follow proper cable-installation practices. When installing cable that will be attached to the switchgear, provide a strain- relief segment to minimize the load on the bushings. Cables must be allowed to expand and flex without putting a significant load on the bushings.
Page 20: Attach Hinged Roof Counterweights
Installation Attach Hinged Roof Counterweights STEP 1. If the roof was previously lifted to the second most vertical position, return it to the 45° position. On the right-hand side of the switchgear enclosure, while pushing up on the hinged roof, release the latch on the “hold-open”...
Page 21: Install Termination Compartment
Installation Install Termination Compartment Cover Panels Carefully re-install the cover panels over each way by inserting the tab at the back of the panel into the slot at the bottom of the operating mechanism. See Figure 19. When lowered to the horizontal position, tighten the pins on the front of the panel to engage them with the front of the enclosure.
Page 22: Fault Indicators
Installation Fault Indicators Fault indicators are to be furnished by the user and installed in accordance with the manufacturer’s instructions. Optional mounting provisions for fault indicators (catalog number suf x “-F1” or “-F2”) are available for S&C Vista SD Underground Distribution Switchgear. If mounting provisions are speci ed, mount the fault indicators on the mounting brackets and attach the associated sensors to the cables below the cable terminations.
Page 23: Closing The Doors And The Hinged Roof
Installation Closing the Doors and the Hinged Roof STEP 1. Lift door-holder mechanism up to allow left-hand door to swing closed. See Figure 22. Make sure the nger latch engages the pin. See Figure 15 on page 17. STEP 2. Lift the door-holder mechanism up to allow right-hand door or the center door to swing closed.
Page 24: Completing The Installation
Installation Completing the Installation STEP 1. A resilient closed-cell gasket on the bottom ange of the enclosure protects the nish from being scratched during installation and isolates it from the alkalinity of a concrete foundation. This gasket also helps to seal the enclosure; to guard against entry of rodents, insects, and Bottom of weeds;...
Page 25: Routine Switchgear Testing
Industry appropriate withstand test values for Vista SD Underground standards such as IEEE 400, “IEEE Guide for Making Distribution Switchgear are given in the following tables.
Page 26: Very Low Frequency (Vlf) Cable Testing
① age because voltage doubling will occur at the open end of the cable, which is assumed to be a unit of Vista SD Underground Distribution Switchgear. If the open end of the cable is grounded, the dc cable- thumping voltage applied to the cable and switchgear can be increased to the dc cable test voltage.
Page 27: Fault-Interrupter Testing
(in case of flashover), ungrounding the cable, applying the VLF test source, discharging the cable, and regrounding the cable. Table 5. Vista SD Switchgear Very Low Frequency (.01- to 1-Hz) Sinusoidal Waveform Maximum Test Voltages Acceptance Test (phase to ground) Maintenance Test (phase to ground)

S&C Vista SD Manual

Table of Contents

Introduction

Safety Information

Safety Precautions

Shipping and Handling

Appendix A

Quick Links

Table of Contents

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Summary of Contents for S&C Vista SD

Table of Contents