S&C VacuFuse II Instruction Sheet
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S&C VacuFuse II Instruction Sheet

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VacuFuse
®
II Self-Resetting Interrupter
Outdoor Distribution (7.2 kV through 15 kV)

Table of Contents

Section
Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . 2
Retain this Instruction Sheet . . . . . . . . . . . . . . . . . . . 2
Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operating Considerations . . . . . . . . . . . . . . . . . . . . . 4
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Understanding Safety-Alert Messages . . . . . . . . . . . 5
Following Safety Instructions . . . . . . . . . . . . . . . . . . 5
Replacement Instructions and Labels . . . . . . . . . . . 5
Location of Safety Labels . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . 7
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Returning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
January 24, 2022
© S&C Electric Company 2022, all rights reserved
For Overhead Distribution Transformer
Protection
Installation
Page
Section
Installation
Before Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Understanding the Closing Sequence . . . . . . . . . . .12
Is Found Open . . . . . . . . . . . . . . . . . . . . . . . . . . .13
from the Cutout Mounting . . . . . . . . . . . . . . . . . . .18
Troubleshooting
Removing the VacuFuse II Interrupter
from the Cutout Mounting Using
Instruction Sheet 466-500
Page

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Summary of Contents for S&C VacuFuse II

  • Page 1: Table Of Contents

    Shipping and Handling Opening and Closing the VacuFuse II Interrupter . . .16 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Removing the VacuFuse II Interrupter Packing .

  • Page 2: Introduction

    Safety Precautions on pages 5 through 7 . The latest version of this publication is available online in PDF format at sandc.com/en/support/product-literature/ . Retain this This instruction sheet is a permanent part of your VacuFuse II Self-Resetting Interrupter. Designate a location where you can easily retrieve and refer to this publication. Instruction...
  • Page 3 Introduction The VacuFuse II Self-Resetting Interrupter, selected for a specific application, should have a maximum voltage rating equal to or greater than system line-to-line voltage when used in phase- to-phase applications. The VacuFuse II Self-Resetting Interrupter can be applied on the primary side of 7.2-kV overhead distribution transformers up to 150 kVA and on 15-kV transformers up to...

  • Page 4: Operating Considerations

    Then, it will close, and the fuse-link curve will again become active (TCC1). If the fault is still on the line, the VacuFuse II Self-Resetting Interrupter will lock open and drop out. If fault current is not still on the line, the Sequence Reset Time timer will begin timing. If another fault occurs during this time, the VacuFuse II Self-Resetting Interrupter will lock open and drop out.

  • Page 5: Safety Information

    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 VacuFuse II Self-Resetting Interrupter. Familiarize yourself with Safety-Alert these messages and the importance of these signal words:...

  • Page 6: Location Of Safety Labels

    OPEN and de-energized . G-9842 Device may be energized from either side… DANGER Fuse Link (Label displaying the VacuFuse II interrupter’s protection curve) ● TCC Curve ● Contact your nearest S&C Sales Office . S&C Instruction Sheet 466-500...

  • Page 7: Safety Precautions

    Safety Precautions DANGER The VacuFuse II Self-Resetting Interrupter 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 . Where a discrepancy exists, follow your company’s operating procedures and rules .

  • Page 8: Shipping And Handling

    When returning the VacuFuse II Self-Resetting Interrupter If concealed damage is discovered: for any reason, place the VacuFuse II interrupter in 1. Notify the delivering carrier within 15 days of receipt of the original shipping carton to prevent damage during shipment.

  • Page 9: Before Starting

    Familiarize yourself with the parts of the VacuFuse II Self-Resetting Interrupter. See Figure 3. Jaw-end contact Pull-ring CHARGING LED READY TO CLOSE LED Hinge-end contact Trunnion POSITION indicator OPEN/CLOSE lever Figure 3. An overview of the VacuFuse II Self-Resetting Interrupter. S&C Instruction Sheet 466-500...

  • Page 10: Installing A Vacufuse Ii Interrupter Into The Cutout Mounting

    VacuFuse II Self-Resetting Interrupter . The VacuFuse II interrupter is different from other cutout-mounted devices . Failure to properly handle a VacuFuse II interrupter with a hotstick and/or an extendostick may lead to serious injury or death . Mounting...

  • Page 11: Closing The Vacufuse Ii Interrupter Into The Cutout Mounting

    Figure 5. Closing the VacuFuse II Interrupter into the Cutout Mounting Trunnion Complete the following steps to close a VacuFuse II Self- Resetting Interrupter into its mounting: NOTICE Read the “Understanding the Closing Sequence” section on page 12 before closing the VacuFuse II Self-Resetting Interrupter into its cutout mounting .

  • Page 12: Understanding The Closing Sequence

    1-second interval as long as there is voltage available at the cutout and the vacuum interrupter is OPEN. The READY TO CLOSE LED will steadily illuminate when the VacuFuse II Self-Resetting Interrupter has har- vested enough energy to close the vacuum interrupter. The VacuFuse II Self-Resetting Interrupter requires 45 ±...

  • Page 13: Operation

    WARNING The VacuFuse II Self-Resetting Interrupter is designed to protect distribution transformers from internal and external fault current . A VacuFuse II Self-Resetting Interrupter found in the Open and Drop Out position should not be closed using the OPEN/CLOSE lever until the cause of the fault current has been determined and repaired .

  • Page 14: If Maintenance Is To Be Performed On The Transformer

    If required by OPEN/CLOSE utility practice, follow the steps in the “Removing lever the VacuFuse II Interrupter from the Cutout Mounting” section starting on page 18. This creates a visible “open gap” showing the transformer is isolated from the feeder.

  • Page 15: Understanding The Led Indicators And Position Indicator

    Operation Understanding the LED Indicators and POSITION Indicator LED Indicators Two LEDs are on the base of the VacuFuse II interrupter. See Figure 8. The CHARGING LED is white and indicates the CHARGING VacuFuse II interrupter is harvesting energy to close the vacuum interrupter.

  • Page 16: Opening And Closing The Vacufuse Ii Interrupter

    Do not refer to the position of the OPEN/CLOSE lever to know the position of the vacuum interrupter. When the POSITION VacuFuse II interrupter trips in response to a fault, the lever indicator in the does not move, leaving the lever in the Closed position when Closed (Red) the vacuum interrupter is in the Open position.
  • Page 17 VacuFuse II interrupter will close after 45 seconds of the unit being powered, and the POSITION indicator will show the red target. See Figure 12. If the VacuFuse II interrupter is inadvertently closed into a fault, the vacuum interrupter will trip open independently of any force still applied to OPEN/CLOSE lever.

  • Page 18: Removing The Vacufuse Ii Interrupter

    Removing the VacuFuse II Interrupter from the Cutout Mounting WARNING DO NOT attempt to remove a VacuFuse II Self- Resetting Interrupter from its cutout mounting with the vacuum interrupter in the Closed position . The vacuum interrupter is in the Closed position when the POSITION indicator at the base of the VacuFuse II interrupter displays a red target .
  • Page 19 Closed position and operating the OPEN/CLOSE lever to the Open position does not work, or the VacuFuse II interrupter is to be removed from its cutout mounting in the Closed position for any other reason, follow the instructions in the “Removing the VacuFuse...

  • Page 20: Loadbuster®-The S&C Loadbreak Tool

    The S&C Loadbreak Tool Interrupter that is in the Closed position without using If the VacuFuse II Self-Resetting Interrupter is in its cutout a loadbreak tool such as S&C’s Loadbuster tool . An mounting with the vacuum interrupter in the Closed...
  • Page 21 Troubleshooting WARNING Stay at least 5 feet (152 cm) below the VacuFuse II interrupter when operating the Loadbuster tool from a bucket truck . Operating the Loadbuster tool from less than 5 feet away is difficult and may result in an improper opening operation, leading to arcing, faults, equipment damage, serious injury, or death .
  • Page 22 Interrupter. The pull-ring latch will deflect and, upon complete entry of the pull-ring, will spring back, locking the Loadbuster tool to the pull- ring. The Loadbuster tool is now connected across the upper contacts of the VacuFuse II Self-Resetting Interrupter, shown Figure 18 on page 23.
  • Page 23 STEP 7. To reset the Loadbuster tool for the next operation, hold it as shown in Figure 19. Extend Figure 18. The Loadbuster tool attached to a VacuFuse II the tool slightly and lift the resetting latch with Self-Resetting Interrupter.

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