S&C Vista Series Instruction Sheet
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S&C Vista Series Instruction Sheet

S&C Vista Series Instruction Sheet

Underground distribution switchgear
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Vista
Underground Distribution Switchgear
®
UnderCover™, Vault-Mounted, and Pad-Mounted Styles

Table of Contents

Section
Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . 2
Retain this Instruction Sheet. . . . . . . . . . . . . . . . . . . 2
Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Understanding Safety-Alert Messages . . . . . . . . . . . 3
Following Safety Instructions . . . . . . . . . . . . . . . . . . 3
Replacement Instructions and Labels . . . . . . . . . . . 3
Location of Safety Labels . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . 5
Overview of Components . . . . . . . . . . . . . . . . . . . . . 6
Ambient Temperature Changes . . . . . . . . . . . . . . 8
Pre-Operation Checks . . . . . . . . . . . . . . . . . . . . . . . 9
January 20, 2020
© S&C Electric Company 1997-2020, all rights reserved
Operation
Page
Section
a Trip Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Locking Out of Grounded Position . . . . . . . . . . . . . .16
Locking Out of the Closed Position . . . . . . . . . . . . .16
VOLTAGE Indicator . . . . . . . . . . . . . . . . . . . . . . . .17
VOLTAGE Indicator with Phasing . . . . . . . . . . . 20
Returning Equipment to Service . . . . . . . . . . . . . . . 22
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Enclosure Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Extremely Corrosive Environments . . . . . . . . . . . 24
Routine Switchgear Testing . . . . . . . . . . . . . . . . . . 25
Cable Testing and Fault Locating . . . . . . . . . . . . . 25
Fault-Interrupter Testing . . . . . . . . . . . . . . . . . . . . . 26
Resistance Measurement . . . . . . . . . . . . . . . . . . . . 27
Instruction Sheet 681-510
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Summary of Contents for S&C Vista Series

  • Page 1: Table Of Contents

    Vista Underground Distribution Switchgear ® UnderCover™, Vault-Mounted, and Pad-Mounted Styles Operation Table of Contents Section Page Section Page Introduction Operating from Grounded to Open Position ..13 Qualified Persons ......2 Operating from Open to Closed Position .

  • Page 2: Introduction

    Introduction Qualified Persons WARNING Only qualified persons who are knowledgeable in the installation, operation, and maintenance of underground electric distribution equipment, along with all associated hazards, may install, operate, and maintain the equipment covered by this publication. A qualified person is someone who is trained and competent in: •...

  • Page 3: Safety Information

    Safety Information Understanding Several types of safety-alert messages may appear throughout this instruction sheet and on labels attached to the Vista switchgear. Familiarize yourself with these types of Safety-Alert messages and the importance of these various signal words: Messages DANGER “DANGER”...

  • Page 4: Location Of Safety Labels

    Safety Information Location of Safety Labels Reorder Information for Safety Information Location Safety Alert Message Description Part Number WARNING Keep Out—Hazardous Voltage Inside G-6681 DANGER Hazardous Voltage—Always Consider Circuits and Components Live . . . G-6700 DANGER Never Drill Into Tank—Hazardous Voltage, Contains Pressurized SF6 Gas G-6682 DANGER Keep Away—Hazardous Voltage (“Mr.

  • Page 5: Safety Precautions

    Safety Precautions DANGER Vista 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 company operating procedures and rules. Where a discrepancy exists, users should follow their company’s operating procedures and rules.

  • Page 6: Components

    Components Overview of Components manually operated three-position (CLOSED/OPEN/ GROUNDED) disconnects for isolation and internal S&C Vista Underground Distribution Switchgear features grounding of each phase. Fault interrupters provide load-interrupter switches for switching 600-ampere main three-pole load switching and fault interruption through feeders.
  • Page 7 Components Submersible tank Fault-interrupter and load- interrupter switch terminals interrupter switch terminals are equipped with 200-ampere are equipped with 200-ampere bushing wells or 600-ampere bushings as specified Figure 4. Termination side of switchgear. Trip indicators Viewing window for single-pole under the VOLTAGE indicator fault interrupters fault interrupters (can be seen...

  • Page 8: Understanding The Gas Pressure Gauge

    Components Understanding the Gas Pressure Gauge Vista switchgear incorporates a temperature-compensated Green Green/Yellow zone gas pressure gauge inside the tank to provide indication zone of the SF -gas pressure gauge is in the green and yellow- striped zone gas pressure. The gas pressure gauge includes Orange four distinct color-coded zones.

  • Page 9: Operation

    Operation Pre-Operation Checks WARNING Do not operate this switchgear if the SF -gas pressure gauge is in the Red zone. Failure to follow this precaution can result in a flashover and equipment damage. Make sure that the SF -gas pressure gauge is in STEP 1.
  • Page 10 Operation STEP 3. If the OPERATION selector is blocking the Operating disk operation, rotate the selector out of the way. The OPERATION selector prevents inadvertent operation directly from the Closed position to the Grounded position, and vice versa. See Figures 11 through 13. Operation Selector Operation Selector Figure 11.

  • Page 11: Operating From Closed To Open Position

    Operation Operating from Closed to Open Position Manual operating handle Manual operating handle WARNING Make sure to complete pre-operational checks shown on pages 9 and 10 prior to operation. Failure to do so can result in equipment damage and personal injury. STEP 1.

  • Page 12: Operating From Open To Grounded Position

    Operation Operating from Open to Grounded Position WARNING Make sure to complete pre-operational checks shown on pages 9 and 10 prior to operation. Failure to do so can result in equipment damage and personal injury. Make sure Steps 1 through 3 on pages 9 and 10 STEP 1.

  • Page 13: Operating From Grounded To Open Position

    Operation Operating from Grounded to Open Position WARNING Make sure to complete pre-operational checks shown on pages 9 and 10 prior to operation. Failure to do so can result in equipment damage and personal injury. STEP 1. Make sure Steps 1 through 3 on pages 9 and 10 are completed.

  • Page 14: Operating From Open To Closed Position

    Operation Operating from Open to Closed Position WARNING Make sure to complete pre-operational checks shown on pages 9 and 10 prior to operation. Failure to do so can result in equipment damage and personal injury. STEP 1. Make sure Steps 1 through 3 on pages 9 and 10 are completed.

  • Page 15: Resetting A Fault Interrupter After A Trip Operation

    Operation Resetting a Fault Interrupter After a Trip Operation WARNING Make sure to complete pre-operational checks shown on pages 9 and 10 prior to operation. Failure to do so can result in equipment damage and personal injury. STEP 1. Make sure Steps 1 through 3 on pages 9 and 10 are completed.

  • Page 16: Locking Out Of Grounded Position

    Operation Locking Out of the Grounded position Operating disk To prevent the operation of a load-interrupter switch or fault interrupter into the Grounded position, insert a padlock through the OPERATION selector and the right- side hole of the locking collar. See Figure 26. Locking Out of the Closed position To prevent the operation of a load-interrupter switch or fault interrupter into the Closed position, insert a padlock...

  • Page 17: Checking For Voltage Using Optional Voltage Indicator

    Operation Checking for Voltage Using Optional Photocell TEST window TEST button PHASE indicator VOLTAGE Indicator WARNING Before using a VOLTAGE indicator, ALWAYS test for proper operation. If the VOLTAGE indi cator is not operating properly, test for volt age using an alternate method.
  • Page 18 Operation (c) If the dot or any of the fl ashing lightning bolts do not appear, make sure the TEST button is completely covered with a gloved fi nger so no light shines on the photoreceptor and there is adequate light (provided either by a fl ashlight or the sun) to power the test circuit.
  • Page 19 Operation Check the PHASE indicators for the desired STEP 3. A blank LCD panel indicates an absence of voltage phases of the load-interrupter switch or fault at the associated bush ing, provided the VOLTAGE interrupter to determine whether there is any indicator circuitry has been tested and determined voltage at the associated bushings.

  • Page 20: Low-Voltage Phasing Using Optional Voltage Indicator With Phasing

    Operation Low-Voltage Phasing Using Optional Phasing Pin 1 Phasing Pin 2 Phasing Pin 3 VOLTAGE indicator with Phasing STEP 1. Clean the surface and phasing pins of the VOLTAGE indicator of dirt and debris. See Figure 38. STEP 2. Test the VOLTAGE indicators for proper oper- ation by following Step 3 under “Checking for Voltage Using Optional Voltage Indica tor”...
  • Page 21 Operation Determine the phase-to-phase relationships of STEP 4. the two ways to be phased as follows: (a) Remove the test probe of the voltmeter from the switchgear tank. (b) Place one of the test probes on Phasing Pin 1 of the fi rst way and place the other probe on Phasing Pin 1 of the second way.

  • Page 22: Returning Equipment To Service

    Operation Returning Equipment to Service STEP 1. Make sure the load-interrupter switch and fault- interrupter grounding means are removed. STEP 2. Make certain the load-interrupter switches and fault interrupters are in the correct positions (Open or Closed). STEP 3. If a pad-mounted enclosure is furnished, close and padlock the termination compart ment before energizing the circuit and operating any Padlock...

  • Page 23: Maintenance

    Maintenance★ Components No mechanical maintenance typically is required for S&C Vista Underground Distribution Switch gear. However, occasional inspection of the switchgear and exercising of the load-inter rupter switches and fault interrupters is recommended. DANGER When access to the bushings or high-voltage components inside the switchgear tank is re quired for inspection, service, or repairs, always observe the precautions below.

  • Page 24: Enclosure Finish

    Maintenance Enclosure Finish The responsibility for ensuring a fi nish protects the pad- mounted enclosure lies with both the manufacturer and the user. The enclosure provided for pad-mounted style switchgear is fi nished with the S&C Ultradur II Outdoor Finish, which provides lasting pro tection for the enclosure. Touch-up To retain this pro tection, the user should take periodic finish...

  • Page 25: Dielectric Testing

    Dielectric Testing Routine Switchgear Testing Cable Testing and Fault Locating For the convenience of users who normally perform Dc testing of installed cables is performed to determine electrical tests on system compo nents such as switchgear, the condition of the cables and to locate faults. Industry appropriate with stand test values for Vista switchgear are standards, such as IEEE 400, “IEEE Guide for Making given in Table 1.

  • Page 26: Fault-Interrupter Testing

    Dielectric Testing Vista switchgear has been designed to allow dc testing of the cables with the other ways of the gear energized. The integral GROUNDING switch may be used to ground the cable. After testing, the dc test equipment should be used to discharge any stored charge on the cable before regrounding with the GROUNDING switch.

  • Page 27: Resistance Measurement

    Dielectric Testing Resistance Measurement DANGER De-energize the Vista Underground Distribution Switchgear before performing resistance measurements described in this procedure. Follow all applicable safety procedures. Failure to de-energize the Vista switchgear before taking resistance measurements can result in serious injury or death. Resistance measurements are used to look for areas of the gear that may exhibit poor contact between current Figure 46.

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