Replacement of 600-Ampere Bushing and 200-Ampere Bushing-Well Adapters

Transcription

1 S&C Vista SD Underground Distribution Switchgear Pad-Mounted and Vault-Mounted Style Outdoor Distribution (17.5 kv and 29 kv) With Visi-Gap Load Interrupter Switches and Visi-Gap Fault Inetrrupters Replacement of 600-Ampere Bushing and 200-Ampere Bushing-Well Adapters Table of Contents Section Page Section Page Introduction Qualified Persons Read this Instruction Sheet Retain this Instruction Sheet Proper Application Warranty Warranty Qualifications Safety Information Understanding Safety-Alert Messages Following Safety Instructions... 4 Replacement Instructions and Labels Safety Precautions Tools Needed Ampere Bushing-Well Adapters Removal Installation Ampere Bushing-Well Adapters Removal Installation March 9, 2015 S&C Electric Company , all rights reserved Instruction Sheet

2 Introduction Qualified Persons Read this Instruction Sheet Retain this Instruction Sheet Proper Application WARNING The equipment covered by this publication must be installed, operated, and maintained by qualified persons who are knowledgeable in the installation, operation, and maintenance of underground electric power distribution equipment along with the associated hazards. A qualified person is one who is trained and competent in: The skills and techniques necessary to distinguish exposed live parts from non-live parts of electrical equipment. The skills and techniques necessary to determine the proper approach distances corresponding to the voltages to which the qualified person will be exposed. The proper use of the special precautionary techniques, per sonal protective equipment, insulating and shielding materials, and insulated tools for working on or near exposed energized parts of electrical equipment. These instructions are intended only for such qualified persons. They are not intended to be a substitute for adequate training and experience in safety procedures for this type of equipment. This instruction sheet covers the replacement of 600-ampere bushing adapters or 200-ampere bushing-well adapters used in S&C Vista SD Underground Switchgear. Read this instruction sheet thoroughly and carefully before replacing 600-ampere bushing adapters or 200-ampere bushing-well adapters. Familiarize yourself with the safety information and precautions on pages 4 and 5. The latest version of this publication is available online in PDF format at sandc.com/support/product-literature.asp 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 it. CAUTION The equipment in this publication must be selected for a specific application. The application must be within the ratings furnished for the equipment. 2 S&C Instruction Sheet

3 Introduction Warranty Warranty Qualifications The warranty and/or obligations described in S&C s standard conditions of sale, as set forth in Price Sheet 150, plus any special warranty provisions, as set forth in the applicable product-line specification bulletin, are exclusive. The remedies provided in the former for breach of these warranties shall constitute immediate purchaser s or end user s exclusive remedy and a fulfillment of all seller s liability. In no event shall seller s liability to immediate purchaser or end user exceed the price of the specific product which gives rise to immediate purchaser s or end user s claim. All other warranties whether express or implied or arising by operation of law, course of dealing, usage of trade or otherwise, are excluded. The only warranties are those stated in Price Sheet 150, and THERE ARE NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. ANY EXPRESS WARRANTY OR OTHER OBLIGATION PROVIDED IN PRICE SHEET 150 IS GRANTED ONLY TO THE IMMEDIATE PURCHASER AND END USER, AS DEFINED THEREIN. OTHER THAN AN END USER, NO REMOTE PURCHASER MAY RELY ON ANY AFFIRMATION OF FACT OR PRIMISE THAT RELATES TO THE GOODS DESCRIBED HEREIN, ANY DESCRIPTION THAT RELATES TO THE GOODS, OR ANY REMEDIAL PROMISE INCLUDED IN PRICE SHEET 150. Seller s standard warranty does not apply to components not of S&C manufacture that are supplied and installed by the purchaser, or to the ability of seller s equipment to work with such components. S&C Instruction Sheet

4 Safety Information Understanding Safety-Alert Messages There are several types of safety-alert messages which may appear throughout this instruction sheet as well as on labels and tags attached to the S&C Vista SD Underground Distribution Switchgear. Familiarize yourself with these types of messages and the importance of the various signal words, as explained below. DANGER DANGER identifies the most serious and immediate hazards which will likely result in serious personal injury or death if instructions, including recommended precautions, are not followed. WARNING WARNING identifies hazards or unsafe practices which can result in serious personal injury or death if instructions, including recommended precautions, are not followed. CAUTION CAUTION identifies hazards or unsafe practices which can result in minor personal injury or product or property damage if instructions, including recommended precautions, are not followed. NOTICE NOTICE identifies important procedures or requirements that can result in product or property damage if instructions are not followed. Following Safety Instructions If you do not understand any portion of this instruction sheet and need assistance, contact your nearest S&C Sales Office or S&C Authorized Distributor. Their telephone numbers are listed on S&C s website sandc.com Or call the S&C Global Support and Monitoring Center at NOTICE Read this instruction sheet thoroughly and carefully before replacing 600-ampere bushing adapters or 200-ampere bushing-well adapters. Replacement Instructions and Labels If you need additional copies of this instruction sheet, contact your nearest S&C Sales Office, S&C Authorized Distributor, S&C Head quarters, or S&C Electric Canada Ltd. It is important that any missing, damaged, or faded labels on the equipment be replaced immediately. Replacement labels are available by contacting your nearest S&C Sales Office, S&C Authorized Distrib utor, S&C Headquarters, or S&C Electric Canada Ltd. 4 S&C Instruction Sheet

5 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. Where a discrepancy exists, follow your company s operating procedures and rules. 1. Qualified Persons. Access to the Vista SD underground distribution switchgear must be restricted only to qualified persons. See Qualified Persons on page Safety Procedures. Always follow safe operating procedures and rules. Always maintain proper clearance from energized components. 3. Personal Protective Equipment. Always use suitable protective equipment such as rubber gloves, rubber mats, hard hats, safety glasses, and arc-flash clothing in accordance with safe operating procedures and rules. 4. Doors. High-voltage compartment doors must be securely closed and latched, with padlocks in place at all times unless work is being performed inside the enclosure. 5. Key Interlocks. Optional key interlocks, if furnished, must be in place. Check the operating sequence of key interlocks to verify proper sequencing. After the switchgear is installed, destroy all duplicate keys or make them accessible only to authorized persons so that the keyinterlock scheme will not be compromised. 6. Opening Doors. Do not apply any undue force when attempting to open a door. The use of undue force may damage the door-latching mechanism. 7. Safety Labels. Do not remove or obscure any of the DANGER, WARNING, CAUTION, or NOTICE labels. 8. Energized Bushings. Always assume that the bushings are energized unless proven otherwise by test, by visual evidence of an open-circuit condition at the load-interrupter switch or fault interrupter, or by observing that the loadinterrupter switch or fault interrupter is grounded. 9. Backfeed. Bushings, cables, load-interrupter switches, and fault interrupters may be energized by backfeed. 10. Grounding. Vista SD Switchgear must be connected to a suitable earth ground before energizing, and at all times when energized. The ground wire(s) must be bonded to the system neutral, if present. If the system neutral is not present, proper precautions must be taken to ensure that the local earth ground cannot be severed or removed. After the switchgear has been completely disconnected from all sources of power and tested for voltage, prop-erly ground the load-interrupter switches and fault interrupters before touching any bushings or components that are to be inspected, replaced, serviced, or repaired. 11. Load-Interrupter Switch or Fault Interrupter Position. Always confirm the open/closed position of the load-interrupter switch or fault interrupter by visually observing the position of the isolating disconnect. Load-interrupter switch or fault interrupter may be energized by backfeed. Load-interrupter switch or fault interruper may be energized in any position. 12. Maintaining Proper Clearance. Always maintain proper clearance from energized components. S&C Instruction Sheet

6 Tools Needed The following tools are needed to remove and install 600-ampere bushing adapters or 200-ampere bushing-well adapters used on S&C Vista SD Underground Distribution Switchgear. See Figures 1 and 2 on page 7. S&C Bushing and Bushing-Well Adapter Assembly Tool. See Figure 3 on page 7. Socket wrench 1-inch socket with extension ⅞-inch socket with extension Torque wrench (10-60 ft.-lbs.) Silicone grease (Dow Corning Molykote 111 or Novagard G661 or equivalent) Isopropyl alcohol (to clean bushings). CAUTION Isopropyl alcohol is the only solvent approved for cleaning 600-ampere bushing adapters or 200-ampere bushing-well adapters used on S&C Vista SD Underground Distribution Switchgear. Petroleum-based solvents should not be used on or around Vista SD underground distribution switchgear. Failure to follow these precautions can result in damamge to the bushing or bushing-well adapters. 6 S&C Instruction Sheet

7 Tools Needed Figure Ampere Bushing Adapter (CHA-1522). Figure Ampere Bushing-Well Adapter (CHA-1732). Figure 3. S&C Bushing and Bushing-Well Adapter Assembly Tool (CHA-2728). S&C Instruction Sheet

8 200-Ampere Bushing-Well Adapters Removal Step 1 De-energize and ground the cables following user s operating procedures and rules. Then remove the cables from the switchgear assembly. DANGER Before touching the bushing to be replaced, always disconnect load-interrupter switches and fault interrupters from all power sources (including backfeed), test for voltage, and properly ground them. Failure to observe these precautions will result in serious personal injury or death. Step 2 Using a socket wrench with a ⅞-inch socket and socket extension, remove the threaded stud at the center of the bushing-well adapter. Rotate the stud counterclockwise. See Figure 4. Threaded stud Figure Ampere bushing-well adapter with threaded stud installed. Step 3 Fully insert the S&C Bushing and Bushing-Well Adapter Assembly Tool (CHA-2728) into the bushing-well adapter. By hand, rotate the tool a few degrees in either direction to engage the hex feature of the tool with the bushing-well adapter attachment bolt. Step 4 Using a socket wrench with a 1-inch socket and socket extension, rotate the S&C Bushing and Bushing-Well Adapter Assembly Tool counterclockwise to loosen the bushing-well adapter. See Figure 5. Figure 5. Loosening the bushing-well adapter. Step 5 Grasp the bushing-well adapter, and continue rotating the S&C Bushing and Bushing-Well Adapter Assembly Tool counterclockwise until the bushing-well adapter can be pulled off of the bushing interface. See Figure 6. Figure 6. Removing the bushing-well adapter. 8 S&C Instruction Sheet

9 200-Ampere Bushing-Well Adapters Installation Step 1 Thoroughly clean the light-gray conical bushing interface on the switchgear assembly using a clean lint-free cloth dipped in isopropyl alcohol. Allow alcohol to thoroughly evaporate. Then apply a smooth, even coating of silicone grease. Step 2 Clean the inside of the larger diameter end of the replacement bushing-well adapter with a clean lint-free cloth dipped in isopropyl alcohol. Allow alcohol to thoroughly evaporate. Then apply a smooth, even coating of silicone grease. Step 3 To attach the bushing-well adapter to the bushing interface on the switchgear assembly, insert the S&C Bushing and Bushing-Well Adapter Assembly Tool into the bushing-well adapter. By hand, rotate the tool a few degrees in either direction to engage the hex feature of the tool with the bushing-well adapter attachment bolt. Holding the tool and the bushing-well adapter as an assembly, position the bushing-well adapter on the bushing interface while aligning the orientation features. See Figures 7 and 8. Step 4 While pushing on the bushing-well adapter, by hand, rotate the S&C Bushing and Bushing-Well Adapter Assembly Tool clockwise to engage the bolt in the bushing-well adapter with the bushing interface on the switchgear assembly. See Figure 9. Continue rotating the wrench clockwise until the bushing-well adapter is fully attached to the bushing interface of the switchgear assembly; tighten and torque to a value of ft.-lbs. Check that the bushing-well adapter is positioned under the ground clip. See Figure 16 on page 11. Step 5 Insert the threaded stud into the bushing-well adapter, with the larger diameter end facing inwards. Using a socket wrench with a socket extension and a ⅞-inch socket rotate the stud clockwise; tighten the stud to a value of 12 ft.-lbs. of torque. See Figure 10. Step 6 Clean the bushing-well adapter interface using a soft lint-free cloth dipped in isopropyl alcohol. Allow the alcohol to thoroughly evaporate. Apply a smooth, even coating of silicone grease before attaching the cables to the switchgear assembly. Figure 7. Orientation features aligned. Figure 9. Tightening the bushing-well adapter. Larger diameter Figure 8. Orientation features misaligned. Smaller diameter Figure 10. Larger diameter of threaded stud faces into bushing-well adapter. S&C Instruction Sheet

10 600-Ampere Bushing Adapters Removal Step 1 De-energize and ground the cables following user s operating procedures and rules. Then remove the cables from the switchgear assembly. DANGER Before touching the bushing to be replaced, always disconnect load-interrupter switches and fault interrupters from all power sources (including backfeed), test for voltage, and properly ground them. Failure to observe these precautions will result in serious personal injury or death. Figure 11. Loosening the bushing adapter. Step 2 Fully insert the S&C Bushing and Bushing-Well Adapter Assembly Tool (CHA-2728) into the bushing adapter. By hand, rotate the tool a few derees in either direction to engage the hex feature of the tool with the bushing adapter attachment bolt. Step 3 Using a socket wrench with a 1-inch socket and socket extension, rotate the S&C Bushing and Bushing-Well Adapter Assembly Tool counterclockwise to loosen the bushing adapter. See Figure 11. Step 4 Grasp the black portion of the bushing adapter, NOT the dark gray portion (see Figure 12), and continue rotating the S&C Bushing and Bushing- Well Adapter Assembly Tool counterclockwise until the bushing adapter can be pulled off the bushing interface. Do NOT grasp the gray tapered portion of the bushing adapter, as it is covered with silicone grease. See Figure 13. Figure 12. Correct method for removal of the bushing adapter. Figure 13. Incorrect method for removal of the bushing adapter. 10 S&C Instruction Sheet

11 600-Ampere Bushing Adapters Installation Step 1 Thoroughly clean the light-gray conical bushing interface on the switchgear assembly using a clean lint-free cloth dipped in isopropyl alcohol. Allow alcohol to thoroughly evaporate. Then apply a smooth, even coating of silicone grease. Step 2 Clean the dark-gray recessed cone on the inside of the bushing adapter with a clean lint-free cloth dipped in isopropyl alcohol. Allow alcohol to thoroughly evaporate. Then apply a smooth, even coating of silicone grease. Figure 14. Orientation features aligned. Figure 15. Orientation features misaligned. Step 3 To attach the bushing adapter to the bushing interface on the switchgear assembly, insert the S&C Bushing and Bushing-Well Adapter Assembly Tool into the bushing adapter. By hand, rotate the tool a few degrees in either direction to engage the hex feature of the tool with the bushing adapter attachment bolt. Holding the tool and the bushing adapter as an assembly, position the bushing adapter on the bushing interface while aligning the orientation features. See Figures 14 and 15. Check that the bushing adapter is positioned under the ground clip. See Figure 16. Figure 16. Bushing adapter should be positioned under the groud clip. Step 4 While pushing on the bushing adapter, by hand, rotate the S&C Bushing and Bushing-Well Adapter Assembly Tool clockwise to engage the bolt in the bushing adapter with the bushing interface on the switchgear assembly. See Figure 17. Continue rotating the wrench clockwise until the bushing adapter is fully attached to the bushing interface of the switchgear assembly; tighten and torque to a value of ft.-lbs. Step 5 Clean the dark gray conical section of the bushing adapter using a soft lint-free cloth dipped in isopropyl alcohol. Allow alcohol to thoroughly evaporate. Apply a smooth, even coating of silicone grease before attaching the cables to the switchgear assembly. Figure 17. Tightening the bushing adapter. S&C Instruction Sheet