Page 1: Table Of Contents
S&C Vista SD Underground Distribution Switchgear ® PMH and PME Configurations Outdoor Distribution (15 kV and 27 kV) Operation Table of Contents Section Page Section Page Introduction Closing the Doors ......12 Qualified Persons .
Page 2: Introduction
PDF format at sandc.com/en/support/ product-literature/. 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...
Page 3: Warranty
Introduction Warranty The warranty and/or obligations described in S&C’s Price Sheet 150 “Standard Conditions of Sale – Immediate Purchasers in the United States” (or Price Sheet 153, Standard Conditions of Sale – Immediate Purchasers Outside the United States) plus any special warranty provisions, as set forth in the applicable product-line speci cation bulletin, are exclusive.
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
Safety Information Location of Safety Labels and Tags WARNING Padlock KEEP OUT Hazardous voltage inside. Can shock, burn, or cause death. If open or unlocked, immediately call electric company. G-6398 DANGER Hazardous voltage—more than 4000 volts. DANGER Failure to follow these instructions will likely cause shock, burns, or death.
Page 6: Safety Precautions
Safety Precautions DANGER S&C Vista SD Underground Distribution Switchgear operates at high voltage. Failure to observe these precautions will result in serious personal injury or death. Some of these precautions may differ from your company’s operating procedures and rules. Where a discrepancy exists, follow your company’s operating procedures and rules.
Page 7: Components
RESET indicator and red for the CLOSED indicator. These environmentally friendly solid-dielectric insulating colors will be reversed (i.e., green for the CLOSED indi- material. Vista SD switchgear is available in ratings cator and red for the OPEN/RESET indicator) if catalog through 27 kV and 16 kA symmetrical interrupting.
Page 8 Fault indicator viewing Overcurrent control window (optional) Figure 2. S&C Vista SD switchgear PMH and PME configurations have the features and options needed to match user needs. Model 431 (4-way) unit shown (Catalog Number Suffix 924313-E11). S&C Instruction Sheet 695-545...
Page 9: Operation
Vista Underground Distribution Switchgear: Installa- tion and Operation of Vista SD Motor Operator,” and 695-525, “S&C Vista SD Underground Dis- tribution Switchgear: Vista SD Portable Remote Control Pendant.” Figure 3. To unlock the front doors, turn the pentahead socket STEP 1.
Page 10 Operation STEP 5. Retrieve the manual operating handle from its storage location at the top-left side of the switchgear assembly. See Figure 5. Manual operating handle STEP 6. Pull the knob forward at the top of the enclosure entryway to move the manual operating guide ring to the active (down) position.
Page 11 Operation STEP 7. To operate the load-interrupter switch or fault interrupter, rotate the operating handle in the appropriate direction rmly, and without hesitation, all the way to the stops. See Figure 7. (a) To open the load-interrupter switch or fault interrupter, rotate the handle counterclockwise.
Page 12: Closing The Doors
Operation Closing the Doors STEP 1. Lift the door holder up to allow the door to swing closed. See Figure 10. Make sure the door holder is placed back in the storage position to allow the door to be fully closed. See Figure 11. Repeat Step 1 for the right door.
Page 13: Resetting Visi-Gap Fault Interrupters
Operation Resetting Visi-Gap Fault Interrupters STEP 1. Check the POSITION indicators to con rm the fault interrupter has tripped. See Figure 14. STEP 2. Retrieve the manual operating handle from its storage location. Attach the handle to the shaft of the operating mechanism. Rotate the handle counterclockwise rmly, and without hesitation, all the way to the stops to reset the fault interrupter.
Page 14 Operation STEP 6. Repair the fault in accordance with your company’s operating procedures and rules. STEP 7. When you are ready to re-energize the circuit, rotate the manual operating handle clockwise to close the fault interrupter. See Figure 18. STEP 8. Check the POSITION indicators to con rm the fault interrupter is closed.
Page 15: Locking In Open Or Closed Position
Operation Locking in Open or Closed Position To prevent operation of a load-interrupter switch or fault interrupter, insert a padlock through the operating mechanism and the center hole in the locking collar. See Figure 21. Locked open Locked closed Figure 21. The load-interrupter switches or fault interrupters may be padlocked in either position.
Page 16: Checking For Voltage Using The Optional
Potential Indication feature. Figure 22. The Potential Indication feature with the cover removed. Petroleum-based solvents should not be used on or around Vista SD Underground Distribution Switchgear. STEP 2. Unscrew the aluminum cap covering the Potential Indication feature. See Figure 22.
Page 17: Voltage-Indication Feature
Using water and mild soap, if necessary, clean STEP 1. the surface of the operating mechanism front panel around the Potential Indication feature. Petroleum-based solvents should not be used on or around Vista SD Underground Distribution Switchgear. Unscrew the aluminum cap covering the STEP 2. Voltage-Indication feature.
Page 18 Operation STEP 4. Determine the phase-to-phase relationships of the two ways to be phased as follows: (a) Remove the test probe of the voltmeter from the neutral jack. (b) Place one of the test probes on Test Jack 1 of the rst way and place the other probe on Test Jack 1 of the second way.
Page 19: Maintenance
Sheet 695-590, “S&C Vista® SD Underground Distribution Switchgear: Inspection Recommendations.” DANGER When access to the bushings on S&C Vista SD Underground Distribution Switchgear is required for inspection, service, or repairs, always observe the Figure 26. Location of the hand bolts on the shelf for shelf following precautions.
Page 20: Pad-Mounted Enclosure Finish
The responsibility for ensuring a finish protects the enclosure lies with both the manufacturer and the user. S&C Vista SD Underground Distribution Switchgear is nished with the S&C Ultradur® Finishing System, which provides lasting protection for the enclosure. To retain...
Page 21: 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 Table 1 as well as High-Direct-Voltage Tests on Power Cable Systems in the Table 2 on page 22.
Page 22: Very Low Frequency (Vlf) Cable Testing
VLF cable testing may subject the S&C Vista SD isolating the dc test source (in case of flashover), Underground Distribution Switchgear to the ac test volt- ungrounding the cable, applying the dc test source, age when the cables are attached to the switchgear.
Page 23: Fault-Interrupter Testing
Appendix A Table 3. Vista SD Switchgear Very Low Frequency WARNING (.01- to 1-Hz) Sinusoidal Waveform Maximum Test Voltages Aging, damage, or electrical or mechanical wear may Acceptance Test Maintenance Test reduce the VLF ac withstand capacity of the switch-...
Page 24 Appendix B Table 4. Auxiliary Contacts Receptacle Connector Pin # Function Vacuum interrupter closed (NO) Vacuum interrupter closed (NC) Vacuum interrupter open (NO) Vacuum interrupter open (NC) Isolating disconnect closed (NO) Isolating disconnect closed (NC) Isolating disconnect open (NO) Isolating disconnect open (NC) Common Shield Figure 28.

S&C Vista SD Instruction Sheet

Table of Contents

Introduction

Safety Information

Safety Precautions

Components

Appendix B

Operation

Maintenance

Appendix A

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