S&C Vista Series User Manual

January 20, 2020
© S&C Electric Company 1997-2020, all rights reserved
Instruction Sheet 681-510
Vista
®
Underground Distribution Switchgear
UnderCover™, Vault-Mounted, and Pad-Mounted Styles
Operation
Table of Contents
Section Page Section Page
Introduction
Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . 2
Retain this Instruction Sheet. . . . . . . . . . . . . . . . . . . 2
Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety Information
Understanding Safety-Alert Messages . . . . . . . . . . . 3
Following Safety Instructions . . . . . . . . . . . . . . . . . . 3
Replacement Instructions and Labels . . . . . . . . . . . 3
Location of Safety Labels . . . . . . . . . . . . . . . . . . . . . 4
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . 5
Components
Overview of Components . . . . . . . . . . . . . . . . . . . . . 6
Understanding the Gas Pressure Gauge . . . . . . . . . 8
Gauge Needle Fluctuations from Rapid
Ambient Temperature Changes . . . . . . . . . . . . . . 8
Operation
Pre-Operation Checks . . . . . . . . . . . . . . . . . . . . . . . 9
Operating from Closed to Open Position . . . . . . . . .11
Operating from Open to Grounded Position . . . . . . .12
Operating from Grounded to Open Position . . . . . . .13
Operating from Open to Closed Position . . . . . . . . .14
Resetting a Fault Interrupter After
a Trip Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Locking Out of Grounded Position . . . . . . . . . . . . . .16
Locking Out of the Closed Position . . . . . . . . . . . . .16
Locking In Closed, Open, or Grounded Position . . .16
Checking for Voltage Using Optional
VOLTAGE Indicator . . . . . . . . . . . . . . . . . . . . . . . .17
Low-Voltage Phasing Using Optional
VOLTAGE Indicator with Phasing . . . . . . . . . . . 20
Returning Equipment to Service . . . . . . . . . . . . . . . 22
Maintenance
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Enclosure Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Maintenance Recommendations in
Extremely Corrosive Environments . . . . . . . . . . . 24
Dielectric Testing
Routine Switchgear Testing . . . . . . . . . . . . . . . . . . 25
Cable Testing and Fault Locating . . . . . . . . . . . . . 25
Fault-Interrupter Testing . . . . . . . . . . . . . . . . . . . . . 26
Resistance Measurement . . . . . . . . . . . . . . . . . . . . 27

S&C Vista Series Specifications

General

Voltage Rating	Up to 38 kV
Continuous Current	600 A
Frequency	60 Hz
Interrupting Rating	Up to 25 kA
Interrupting Current	20 kA, 25 kA
BIL	95 kV, 125 kV, 150 kV
Insulation Medium	SF6
Enclosure Type	Metal-clad or Metal-enclosed
Number of Ways	2, 3, 4, 5, or 6
Switching Mechanism	Vacuum Interrupters
Operating Mechanism	Manual
Standards Compliance	IEEE C37.60
Fault Interruption	Yes

Summary

Introduction

Qualified Persons

Defines requirements for personnel operating the switchgear.

Read this Instruction Sheet

Emphasizes the importance of thoroughly reading the instruction sheet before operation.

Retain this Instruction Sheet

Instructs users to keep the instruction sheet as a permanent part of the switchgear.

Proper Application

States that equipment must be selected for specific applications within its ratings.

Warranty

Outlines the warranty terms and conditions for the switchgear.

Understanding Safety-Alert Messages

Explains the meaning of DANGER, WARNING, CAUTION, and NOTICE signal words.

Following Safety Instructions

Advises contacting S&C for assistance if any part of the instruction sheet is unclear.

Replacement Instructions and Labels

Details how to obtain replacement instruction sheets and labels for the equipment.

Location of Safety Labels

Identifies the location and provides reorder information for safety labels on the switchgear.

Safety Precautions

Components

Overview of Components

Describes the Vista Underground Distribution Switchgear, its features, and styles.

Understanding the Gas Pressure Gauge

Explains the four color-coded zones of the SF6 gas pressure gauge and their indications.

Gauge Needle Fluctuations from Rapid Ambient Temperature Changes

Details how ambient temperature changes can affect the gas pressure gauge needle readings.

Operation

Pre-Operation Checks

Lists essential checks before operating the switchgear, including SF6 pressure and blade position.

Operating from Closed to Open Position

Provides step-by-step instructions for opening the load-interrupter switch or fault interrupter.

Operating from Open to Grounded Position

Details the procedure for moving the switchgear from the Open to the Grounded position.

Operating from Grounded to Open Position

Explains how to operate the switchgear from the Grounded to the Open position.

Operating from Open to Closed Position

Outlines the steps for closing the load-interrupter switch or fault interrupter.

Resetting a Fault Interrupter After a Trip

Guides users on how to reset a fault interrupter after it has tripped due to a fault.

Locking Out of the Grounded position

Describes how to lock the switchgear in the Grounded position to prevent operation.

Locking Out of the Closed position

Details the procedure for locking the switchgear in the Closed position to prevent operation.

Locking In Closed, Open, or Grounded Position

Explains how to lock the switchgear into any of its operational positions.

Checking for Voltage Using Optional VOLTAGE Indicator

Provides instructions on testing and using the optional VOLTAGE indicator for voltage checks.

Low-Voltage Phasing Using Optional VOLTAGE indicator with Phasing

Explains how to perform low-voltage phasing using the optional VOLTAGE indicator.

Returning Equipment to Service

Outlines the steps for safely returning the switchgear to service after maintenance or testing.

Maintenance

Components

Discusses general maintenance requirements for switchgear components, emphasizing inspection and exercising.

Enclosure Finish

Describes the maintenance of the switchgear enclosure's outdoor finish and touch-up procedures.

Maintenance Recommendations in Extremely Corrosive Environments

Provides guidance on cleaning and maintaining the switchgear in corrosive environments.

Dielectric Testing

Routine Switchgear Testing

Lists appropriate withstand test values for Vista switchgear and necessary precautions.

Cable Testing and Fault Locating

Describes de testing of cables and fault locating methods, referencing industry standards.

Fault-Interrupter Testing

Advises that routine testing of vacuum fault interrupters is not recommended.

Resistance Measurement

Details the procedure for measuring resistance to identify poor contact in current-carrying parts.