s&c remote supervisory vista underground … current sensor, voltage sensor, and motor operator...

S&C ELECTRIC COMPANY

Specialists in Electric Power Switching and Protection

Instruction Sheet 682-505August 20, 2001

©

2001

Supersedes Instruction Sheet 682-505 dated 8-2-99

S&C Remote Supervisory Vista

®

Underground Distribution Switchgear

Pad-Mounted, Dry-Vault-Mounted, Wet-Vault-Mounted, and UnderCover™ Styles

Instructions For Installation

Section Page Section Page

INTRODUCTION

Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Read this Instruction Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . 2Retain this Instruction Sheet. . . . . . . . . . . . . . . . . . . . . . . . . 2Proper Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SAFETY INFORMATION

Understanding Safety-Alert Messages . . . . . . . . . . . . . . . . . 3Following Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . 3Replacement Instructions and Labels . . . . . . . . . . . . . . . . . 3Location of Safety Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

INSPECTION AND HANDLING—Pad-Mounted Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

INSPECTION AND HANDLING—Dry-Vault-Mounted Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

INSPECTION AND HANDLING—Wet-Vault-Mounted Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

INSPECTION AND HANDLING—UnderCover Style

Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

INSTALLATION

Enclosure Removal—Pad-Mounted Style . . . . . . . . . . . . . 13Tank Placement—Pad-Mounted Style . . . . . . . . . . . . . . . . 14Cable Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Enclosure Placement—Pad-Mounted Style . . . . . . . . . . . 16Tank Placement—Dry-Vault-Mounted, Wet-Vault-Mounted,

and UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . 17Cable Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

INSTALLATION—Continued

Enclosure Placement—Dry-Vault-Mounted and Wet-Vault-Mounted Styles . . . . . . . . . . . . . . . . . . . . . . . 19Enclosure Placement—UnderCover Style . . . . . . . . . . . . 19Grounding—Pad-Mounted Style . . . . . . . . . . . . . . . . . . . . 20Grounding—Dry-Vault-Mounted Style . . . . . . . . . . . . . . . . 22Grounding—Wet-Vault-Mounted and

UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Current Sensors—Pad-Mounted and Dry-Vault-Mounted

Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Current Sensors—Wet-Vault-Mounted and

UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Fault Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Low-Voltage Compartment Wiring—Pad-Mounted Style .28Low-Voltage Enclosure Wiring—

Dry-Vault-Mounted Style . . . . . . . . . . . . . . . . . . . . . . . . . 31Low-Voltage Enclosure Wiring—Wet-Vault-Mounted and

UnderCover Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Motor Operator Installation—

Pad-Mounted and Dry-Vault-Mounted Styles . . . . . . . . 37Motor Operator Installation—

Wet-Vault-Mounted and UnderCover Styles . . . . . . . . . 39Initial Testing of Motor Operators and Controls . . . . . . . . 41Setting Up the Gear for Operation . . . . . . . . . . . . . . . . . . . 42Completing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . 43

DIELECTRIC TESTING

Routine Switchgear Testing . . . . . . . . . . . . . . . . . . . . . . . . . 45Cable Testing and Fault Locating . . . . . . . . . . . . . . . . . . . . 46Fault-Interrupter Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . 47Vista Switchgear Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Fault-Interrupter and Load-Interrupter Switching

Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

SPECIFICATIONS

Switchgear Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Communication and Control Equipment . . . . . . . . . . . . . . 50Motor Operator Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Sensing Options for Motor-Operated Ways . . . . . . . . . . . . 51Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Touch-Up Kit Components. . . . . . . . . . . . . . . . . . . . . . . . . . 55

682-505 2

INTRODUCTION

Ç

WARNING

The equipment covered by this publication must be installed, oper-ated, and maintained by qualified persons who are knowledgeablein the installation, operation, and maintenance of undergroundelectric power distribution equipment along with the associatedhazards. A qualified person is one who is trained and competent in:

•

The skills and techniques necessary to distinguish exposed liveparts from non-live parts of electrical equipment.

•

The skills and techniques necessary to determine the properapproach distances corresponding to the voltages to which thequalified 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 energizedparts of electrical equipment.

These instructions are intended only for such qualified persons.They are

not

intended to be a substitute for adequate training andexperience in safety procedures for this type of equipment.

Qualified Persons

Read this Instruction Sheet

Read this instruction sheet thoroughly and carefully before installingor operating your S&C Remote Supervisory Vista Underground Dis-tribution Switchgear. Familiarize yourself with “SAFETY INFORMA-TION” on pages 3 and 4.

Retain this Instruction Sheet

This instruction sheet is a permanent part of your S&C Remote Super-visory Vista Underground Distribution Switchgear. Designate a loca-tion where you can easily retrieve and refer to this publication.

Proper Application

Warranty

The standard warranty contained in S&C’s standard conditions ofsale, as set forth in Price Sheet 150, is applicable to the S&C RemoteSupervisory Vista Underground Distribution Switchgear covered inthis instruction sheet.

Ç

CAUTION

The equipment in this publication must be selected for a specificapplication. The application must be within the ratings furnishedfor the equipment. Ratings for this gear are listed on a ratings labelat the front of the switchgear tank.

3 682-505

Understanding Safety-AlertMessages

There are several types of safety-alert messages which may appearthroughout this instruction sheet as well as on labels attached to theRemote Supervisory Vista switchgear. Familiarize yourself with thesetypes of messages and the importance of the various signal words, asexplained below.

Following Safety Instructions

If you do not understand any portion of this instruction sheet andneed assistance, contact your nearest S&C Sales Office or S&C Autho-rized Distributor, or call S&C Headquarters at (773) 338-1000, Mondaythrough Friday between 8:30 AM and 5:00 PM Central Standard Time.(In Canada, call S&C Electric Canada Ltd. at (416) 249-9171, Mondaythrough Friday between 8:00 AM and 5:00 PM Eastern StandardTime.)

Replacement Instructions and Labels

If you need additional copies of this instruction sheet, contact yournearest 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 theequipment be replaced immediately. Replacement labels are availableby contacting your nearest S&C Sales Office, S&C Authorized Distrib-utor, S&C Headquarters, or S&C Electric Canada Ltd.

Ç

DANGER

“DANGER” identifies the most serious and immediate hazardswhich

will likely

result in serious personal injury or death if in-structions, including recommended precautions, are not followed.

Ç

WARNING

“WARNING” identifies hazards or unsafe practices which

can

re-sult in serious personal injury or death if instructions, includingrecommended precautions, are not followed.

Ç

CAUTION

“CAUTION” identifies hazards or unsafe practices which

can

resultin minor personal injury or product or property damage if instruc-tions, including recommended precautions, are not followed.

NOTICE

“NOTICE” identifies important procedures or requirements that, ifnot followed,

can

result in product or property damage if instruc-tions are not followed.

NOTICE

SAFETY INFORMATION

Read this instruction sheet thoroughlyand carefully before installing yourS&C Remote Supervisory Vista Under-ground Distribution Switchgear.

682-505 4

SAFETY INFORMATION

Location of Safety Labels

A

Pad-mounted enclosure

B

C D

G

EF

Top of switchgear

Low-voltage compartment

Reorder Information for Safety Labels

Location Safety-Alert Message Description Number

A Ç

WARNING

Keep Out—Hazardous Voltage Inside G-6681

B Ç

DANGER

Hazardous Voltage—Always Consider Circuits and Components Live . . . G-6700

C Ç

DANGER

Never Drill Into Tank—Hazardous Voltage, Contains Pressurized SF

6

Gas G-6682

D Ç

DANGER

Keep Away—Hazardous Voltage (“Mr. Ouch”) G-6699

E Ç

WARNING

Check Gas Pressure Before Operating Switchgear G-6686

F Ç

WARNING

Always Test Voltage Indicator For Proper Operation G-6689

G Ç

WARNING Always Visually Confirm Blade PositionG-6693

G-6694 (Option “-L2”)

5 682-505

Packing Pad-mounted style switchgear consists of the tank and the outerenclosure (which has the low-voltage compartment attached to it).Both are fastened to a wooden skid, with the tank shipped within theouter enclosure. Motor operators are individually packed and shippedin boxes. Optional current sensors are packaged three per box andare shipped separate from the gear.

All current sensor, voltage sensor, and motor operator wiring isrouted to the low-voltage compartment through a junction box that ismounted on the tank. These wires and cables are neatly coiled and seton the tank for user installation.

At the first opportunity, remove all packing materials (cardboard,paper, foam padding, etc.) from the outside of the pad-mounted enclo-sure. This will prevent the finish from being damaged by rainwaterabsorbed by the packing materials and will also prevent wind-inducedabrasion from loose cardboard.

Inspection Examine the shipment for external evidence of damage as soon afterreceipt as possible, preferably before removal from the carrier’s con-veyance. Check the bill of lading to make sure that all shipping skids,crates, and containers listed thereon are present.

If there is visible loss and/or damage:

1. Notify the delivering carrier immediately.2. Ask for a carrier inspection.3. Note condition of shipment on all copies of the delivery receipt.4. File a claim with the carrier.

If concealed damaged is discovered:

1. Notify the delivering carrier within 15 days of receipt of shipment.2. Ask for a carrier inspection.3. File a claim with the carrier.

Also notify S&C Electric Company in all instances of loss and/ordamage.

NOTICE Do not store outside. Weather conditions may damage uninstalledelectrical components.


682-505 6

Handling

Step 1

Use 6-foot or longer hoist slings of equallength to prevent damaging the enclosure ortank during lifting.

Ç WARNINGWhen handling an enclosure or tank with anoverhead hoist, observe standard liftingpractices as well as the general instructionsbelow. Failure to follow these precau-

tions can result in serious personal in-

jury or equipment damage.

Step 2

Arrange the hoist slings so as to distribute thelifting forces equally between the lifting tabs.Avoid sudden starts and stops. See Figures 1and 2.

Ç WARNINGDo NOT lift the pad-mounted enclosurewhile it is bolted to the skid with the tank.The lifting tabs on the pad-mounted enclo-sure will not support the combined weightof the pad-mounted enclosure and the tank.Before lifting with slings, follow the direc-tions under “Enclosure Removal Pad-Mounted Style” on pages 13 and 14. Failure

to follow these precautions can result

in serious personal injury or equipment

damage.


Figure 2. Tank for pad-mounted style.

Figure 1. Enclosure for pad-mounted style.

Lifting points XX

X

7 682-505

Packing Dry-vault-mounted style switchgear consists of the tank and the low-voltage enclosure. Each are fastened to their own wooden skid.Motor operators are individually packed and shipped in boxes.Optional current sensors are packaged three per box and are shippedseparate from the gear.

All external wiring is coiled at the end of the tank for user installa-tion.

At the first opportunity, remove all packing materials (cardboard,paper, foam padding, etc.) from the outside of the low-voltage enclo-sure. This will prevent the finish from being damaged by rainwaterabsorbed by the packing materials and will also prevent wind-inducedabrasion from loose cardboard.







NOTICEDo not store outside. Weather conditions may damage uninstalledelectrical components.


682-505 8

Handling

Step 3





Step 4


Figure 3. Tank for dry-vault-mounted style. (Floor-mount lifting scheme shown.)


Figure 4. Low-voltage enclosure for dry-vault-mounted style.

9 682-505


Packing Wet-vault-mounted style switchgear consists of the tank and the low-voltage enclosure. Each are fastened to their own wooden skid.Motor operators are attached to the cables and are individuallypacked and shipped in boxes. Optional current sensors are shippedattached to the gear by the required wiring.









NOTICEDo not store outside. Weather conditions may damage uninstalledelectrical components.

682-505 10


Handling

Step 5





Step 6


NOTICELow-voltage enclosure is not submersible.The enclosure should be mounted aboveground or in a dry location.

Figure 5. Tank for wet-vault-mounted style. (Floor-mount lifting scheme shown.)

Figure 6. Low-voltage enclosure for wet-vault-mounted style.

11 682-505

Packing

UnderCover style switchgear consists of the tank and the low-voltageenclosure. Each are fastened to their own wooden skid. Motor opera-tors are attached to the cables and are individually packed andshipped in boxes. Optional current sensors are shipped attached tothe gear by the required wiring.



Inspection

Examine the shipment for external evidence of damage as soon afterreceipt as possible, preferably before removal from the carrier’s con-veyance. Check the bill of lading to make sure that all shipping skids,crates, and containers listed thereon are present.






NOTICE

Do not store outside. Weather conditions may damage uninstalledelectrical components.


682-505 12

Handling

Step 7


Ç

WARNING

When handling an enclosure or tank with anoverhead hoist, observe standard liftingpractices as well as the general instructionsbelow.

Failure to follow these precau-



Step 8


NOTICE

Low-voltage enclosure is not submersible.The enclosure should be mounted aboveground.

Figure 7. Tank for UnderCover style.


Figure 8. Low-voltage enclosure for UnderCover style.

13 682-505

INSTALLATION

Enclosure Removal—Pad-Mounted Style

Step 9

Loosen the pentahead bolts securing thehinged roofs to the enclosure using a penta-head socket wrench with extender or a penta-head tool. See Figure 9.

Step 10

Lift the hinged roofs upward and secure themwith the holders. Make sure that the low-volt-age compartment door is closed. SeeFigure 10.

Pentahead wrench with extender

Frontpanel

Holder

Hinged roofs

Operation compartment

Termination compartment

Front panel

Low-voltage compart-ment


Figure 9. Pad-mounted style gear.

Figure 10. Pad-mounted style gear—roofs open.

682-505 14

Step 11

Unbolt the enclosure from the skid andremove it, observing the precautions givenunder “Handling” on page 6. Use a three-pointlifing scheme to properly balance the enclo-sure. Set the enclosure aside in a protectedarea. See Figure 11.

INSTALLATION

Terminationcompartment


Lifting point

Lifting point

Lifting point

Figure 11. Top view of pad-mounted style gear, displaying three-point lifting.

Not to be used as a lifting point

Tank Placement—Pad-Mounted Style

Step 12

Unbolt the tank from the skid and lift it abovethe mounting pad, observing the precautionsgiven under “Handling” on page 6. Use a four-point lifting scheme to properly balance thegear. Verify that the tank is positioned cor-rectly with respect to the cables and anchorbolts.

Step 13

Lower the tank into place. Secure the tank tothe pad using the anchor brackets provided.See Figure 12.

Figure 12. Tank as shipped.

Bushings

shown with covers removed

Shipping coversShipping

covers

Bolts

15 682-505

Cable Terminations

Step 14

Remove the shipping covers from the bush-ings and bushing wells. See Figure 13.

Ç

DANGER

Before energizing the switchgear, replacethe shipping caps on all bushings and bush-ing wells with elbows or insulated protec-tive covers or plugs.

Failure to replace

the shipping caps with elbows or insu-

lated protective covers or plugs can

result in a flashover and serious per-

sonal injury or death.

Step 15

Terminate the cables with elbows followingthe elbow manufacturer’s instructions. SeeFigure 14.

Ç

CAUTION

ALWAYS

follow proper cable installationpractices. When installing cable to theswitchgear, provide a strain-relief segmentto minimize load on the bushings. Cablesmust be allowed to expand and flex withoutputting significant load on the bushings. Forpit installations, either loop the cable in thepit, or bring it into the pit horizontally andup to the gear at a 90º angle.

Failure to fol-

low these precautions can result in

damage to the bushings and bushing

wells and subsequent leakage of the

SF

6

insulating gas.

Shipping covers

are provided for bush-ing wells

Shipping covers

removed

Fault-interrupterterminals

are equippedwith 200-ampere bushing wells or 600-amperebushing as specified

Shipping covers

are provided for bushings

Load-interrupter switch terminals

are equipped with 600-ampere bushings or 200-ampere bushings as specified

Elbows and inserts—

supplied by user

Bushing and bushing well interfaces conform to ANSI/IEEE Standard 386 to accept standard elbows and inserts

Figure 13. Vista tank with shipping covers.

Figure 14. Vista tank shown with user-supplied cables and elbows.

INSTALLATION

682-505 16

INSTALLATION

Enclosure Placement—Pad-Mounted Style

Step 16

Lift the enclosure into place over the tank,observing the precautions given under “Han-dling” on page 6. Again, use a three-point lift-ing scheme to properly balance the enclosure.See Figure 15.

Ç

CAUTION

When installing the pad-mounted enclosureover the tank, place the side of the enclo-sure with the “Termination Compartment”label over the teminators and the side ofthe enclosure with the “Operation Com-partment” label over the operating mecha-nisms. This will ensure that thecompartments are properly identified andthe panels are in their correct locations.

Step 17

Refer to the catalog dimensional drawing fur-nished and verify that the enclosure compart-ments are positioned correctly and that theenclosure is properly aligned with respect tothe anchor bolts.

Secure the enclosure to the pad using theanchor brackets provided. See Figure 16.

Lowering enclosure over tank

Low-voltagecompartment

Figure 15. Three-point lifting scheme.

Gasket

Enclosure

1.5

�

min.

Four

⁵⁄₈

�

dia. anchor bolts by user

Anchor bracket

Figure 16. Anchor bracket placement.

17 682-505

INSTALLATION

Tank Placement—Dry-Vault-Mounted, Wet-Vault-Mounted, and UnderCover Styles

Step 18

Remove the switchgear from its crate and liftthe gear, observing the precautions givenunder “Handling” on pages 8, 10, and 12.

Secure the switchgear in place in accor-dance with the pull box or wall brackets pro-vided by the user. See Figure 17.

Figure 17. Switchgear is bolted to skid in four places for shipment.

Bushings

shown with covers removed

Shipping coversShipping

covers

Bolts

682-505 18

INSTALLATION

Cable Terminations

Step 19

Remove the shipping covers from the bush-ings and bushing wells. See Figure 18.

Ç

DANGER

Before energizing the switchgear, replacethe shipping caps on all bushings and bush-ing wells with elbows or insulated protec-tive covers or plugs.

Failure to replace

the shipping caps with elbows or insu-

lated protective covers or plugs can

result in a flashover and serious per-

sonal injury or death.

Step 20

Terminate the cables with elbows followingthe elbow manufacturer’s instructions. SeeFigure 19.

Ç

CAUTION

ALWAYS

follow proper cable installationpractices. When installing cable to theswitchgear, provide a strain-relief segmentto minimize load on the bushings. Cablesmust be allowed to expand and flex withoutputting significant load on the bushings. Forpit installations, either loop the cable in thepit, or bring it into the pit horizontally andup to the gear at a 90º angle.

Failure to fol-

low these precautions can result in

damage to the bushings and bushing

wells and subsequent leakage of the

SF

6

insulating gas.

Shipping covers

are provided for bushing wells

Shipping covers

removed

Fault-interrupterterminals

are equippedwith 200-ampere bushing wells or 600-amperebushing as specified

Shipping covers

are provided for bushings

Load-interrupter switch terminals

are equipped with 600-ampere bushings or 200-ampere bushings as specified

Elbows and inserts—

supplied by user

Bushing and bushing well interfaces conform to ANSI/IEEE Standard 386 to accept standard elbows and inserts

Figure 18. Vista tank with shipping covers.

Figure 19. Vista tank shown with user-supplied cables and elbows.

19 682-505

INSTALLATION

Enclosure Placement—Dry-Vault-Mounted andWet-Vault-Mounted Styles

Step 21

Unbolt the low-voltage enclosure from its skidand set it upright if necessary, observing theprecautions given under “Handling” on page 8.Use a two-point lifting scheme to properly bal-ance the enclosure. Verify that the enclosure ispositioned correctly for mounting to wall orpost.

Secure the low-voltage enclosure to a wallor post.

Enclosure Placement—UnderCover Style

Step 22

Unbolt the low-voltage enclosure from its skidand set it upright if necessary, observing theprecautions given under “Handling” on page16. Use a two-point lifting scheme to properlybalance the enclosure. Verify that the enclo-sure is positioned correctly for placement onuser pad. See Figure 20.

Secure low-voltage enclosure on user-sup-plied pad.

Figure 20. Low-voltage enclosure for UnderCover style.

682-505 20

Low voltage compartment

Tank ground pad


Termination compartment

Enclosure ground pad

Shortest possible connection

INSTALLATION

Grounding—Pad-Mounted Style

Step 23

Connect the ground pad of the tank and theground pad inside the enclosure to the systemground facility in accordance with the user’sstandard grounding practice. See Figure 21.Use ground pad as indicated in Figure 22.

Use the equivalent of 4/0 copper (or cablesized in accordance with the user’s standardpractice) in either a single or multiple connec-tion to realize the maximum momentary ratingof the switchgear. For a multiple connection,cables smaller than 1/0 copper or equivalentshould not be used.

Ç

IMPORTANTTo ensure proper operation of the compo-nents inside the low-voltage enclosure, con-nect the tank ground pad and the enclosureground pad provided near the low-voltageenclosure, to the system ground facility.

Figure 21. Pad-mounted enclosure ground pad.

Enclosureground pad

Figure 22. Pad-mounted enclosure ground pad orientation.

21 682-505

INSTALLATION

Step 24

Connect the cable concentric-neutral groundwires to the grounding system as appropriate.See Figure 23.

Step 25

Connect the tank ground pad to enclosure padwith the shortest possible connection. Use theequivalent of 4/0 copper (or cable sized inaccordance with the user’s standard practice).See Figure 23.

Tank ground pad

Ground in accordance with user’s standard grounding practice

Figure 23. Tank ground pad.

682-505 22

INSTALLATION

Grounding—Dry-Vault-Mounted Style

Step 26


Step 27

Connect the ground pad of the tank and theground pad inside the enclosure to the systemground facility in accordance with the user’sstandard grounding practice. See Figure 25.

Use the equivalent of 4/0 copper (or cablesized in accordance with the user’s standardpractice) in either a single or multiple connec-tion to realize the maximum momentary ratingof the switchgear. For a multiple connection,cables smaller than 1/0 copper or equivalentshould not be used.

Step 28

Connect tank ground pad to enclosure groundpad with the shortest possible connection.Use the equivalent of 4/0 copper (or cablepractice). See Figure 24.

Grounding—Wet-Vault-Mounted and UnderCover Styles

Step 29


Step 30

Connect the heavy shielded cable tails fromeach of the main cables to the tank groundpad using the clamshell connector provided.The shortest possible connection should bemade. There is one heavy shielded cable tailper motor operated way.

Tank ground pad

Ground in accordance with user’s standard grounding practice

Figure 24. Tank ground pad.

Figure 25. Connect shielded cable to tank ground.

23 682-505

INSTALLATION

Current Sensors—Pad-Mounted andDry-Vault-Mounted Styles

Step 31

Optional current sensors are packaged threein a box.

1. Remove the current sensors, hardware, andwiring harness from the box marked “S&CCurrent Sensors.” Connect the current sen-sors to the wiring harness as shown on theinterconnection wiring diagram providedwith the gear. See Figure 26.

2. Place each current sensor in front of thephase of the way on which it will beinstalled.

Note:

Way and phase numbersare located above the bushing on the termi-nation side.

3. Record the magnitude ratio and phaseangle shift of each current sensor in theappropriate location (in accordance withthe way and phase on which the currentsensor will be installed) on the yellow cardprovided in the “Installation and OperationInformation Kit.” The magnitude ratio andphase-angle shift of each current sensor arewritten on a tag attached to the sensor andon the sensor.

4. Remove the

¹⁄₄

�

–20 gap nut on one of thecurrent sensors. Open the sensor and placeit around the appropriate high-voltagecable. All three current sensors for eachway must be installed with the polaritymarks facing in the same direction—prefer-ably up, so that the magnitude ratio andphase-angle shift values are visible. Thenreplace and tighten the gap nut.

Ç

IMPORTANT

Each S&C current sensor has a unique mag-nitude ratio and phase-angle shift. Thesevalues are used to calibrate the currentsensing inputs to the user-supplied RTU.The magnitude ratio and phase-angle shiftof each current sensor must be recorded onthe yellow card provided in accordancewith the way and phase on which the cur-rent sensor will be installed. The magnituderatio and phase-angle shift of each currentsensor are written on a tag attached to thesensor and on the sensor.

Figure 26. Attach current sensors to required wiring.

682-505 24

INSTALLATION

5. Secure the current sensors to the high-volt-age cable below the cable terminator usingthe plastic tie wraps furnished. If the cablehas a grounded concentric neutral, the cur-rent sensor must be secured in one of thefollowing ways:

a. It may be placed around the concentricneutral, in which case the concentricneutral must be brought back throughthe current sensor. See Figure 27.

b. It may be placed above the concentricneutral, in which case the terminatordrain wire must be brought through thesensor. See Figure 28.

6. Install the other two current sensors of theset by repeating Steps 4 and 5 above.

7. Cross-check the magnitude ratio andphase-angle shift of each current sensorwith the information recorded on the yel-low card.

8. Remove and discard the attached tags.

Figure 27. Current sensors placed around cable’s grounded concen-tric neutral.

Figure 28. Current sensors placed above cable’s grounded concen-tric neutral.

25 682-505

INSTALLATION

Current Sensors—Wet-Vault-Mounted andUnderCover Styles

Step 32

Optional current sensors are already attachedto the required wiring. See Figure 29.

1. Place each current sensor in front of thephase of the way on which it will beinstalled.

Note:

Way and phase numbersare located above the bushing on the termi-nation side.

2. Record the magnitude ratio and phaseangle shift of each current sensor in theappropriate location (in accordance withthe way and phase on which the currentsensor will be installed) on the yellow cardprovided in the “Installation and OperationInformation Kit.” The magnitude ratio andphase-angle shift of each current sensor arewritten on a tag attached to the sensor andon the sensor.

3. Open the sensor with the sensor releasetool provided, place the sensor around theappropriate high-voltage cable. All threecurrent sensors for each way must beinstalled with the polarity marks facing inthe same direction—preferably up, so thatthe magnitude ratio and phase-angle shiftvalues are visible. Then close the sensor.

Ç

IMPORTANT

Each S&C current sensor has a unique mag-nitude ratio and phase-angle shift. Thesevalues are used to calibrate the currentsensing inputs to the user-supplied RTU.The magnitude ratio and phase-angle shiftof each current sensor must be recorded onthe yellow card provided in accordancewith the way and phase on which the cur-rent sensor will be installed. The magnituderatio and phase-angle shift of each currentsensor are written on a tag attached to thesensor and on the sensor.

Figure 29. Wiring is already attached to the current sensors.

682-505 26

INSTALLATION

4. Secure the current sensors to the high-volt-age cable below the cable terminator usingthe plastic tie wraps furnished. If the cablehas a grounded concentric neutral, the cur-rent sensor must be secured in one of thefollowing ways:

a. It may be placed around the concentricneutral, in which case the concentricneutral must be brought back throughthe current sensor. See Figure 31.

b. It may be placed above the concentricneutral, in which case the terminatordrain wire must be brought through thesensor. See Figure 32.

5. Install the other two current sensors of theset by repeating Steps 4 and 5 above.

6. Cross-check the magnitude ratio andphase-angle shift of each current sensorwith the information recorded on the yel-low card.

7. Remove and discard the attached tags.

Figure 31. Current sensors placed around cable’s grounded concen-tric neutral.

Figure 32. Current sensors placed above cable’s grounded concen-tric neutral.

27 682-505

INSTALLATION

Fault Indicators

Step 33

Fault indicators are to be furnished by theuser and installed in accordance with the man-ufacturer’s instructions. Optional mountingprovisions for fault indicators (CatalogNumber Suffix “-F1” or “-F2” or “-F12”) areavailable. See Figure 33.

Step 34

If mounting provisions are specified, mountthe fault indicators on the mounting brackets.See Figure 34.

Figure 33. Mounting provisions for user-furnished fault indicators.

Figure 34. Mounting brackets for user-furnished fault indicators.

682-505 28

INSTALLATION

Motor operator cables

Main cables to low-voltage enclosure

Junction box

Low-Voltage Compartment Wiring—Pad-Mounted Style

Step 35

Uncoil the junction box main cables that willbe routed to the low-voltage compartment.See Figure 35. These cables have low-voltageconnectors on their ends.

Step 36

Using the pipe and sealing kit provided, feedthe junction box main cables with connectorsthrough the access port into the low-voltagecompartment, as follows.

a. Insert the three-inch PVC pipe throughthe access port. See Figure 36. Makesure that equal lengths of pipe are show-ing in the low-voltage compartment andthe pad-mounted enclosure.

b. Gather the ends of the main cablestogether and slip the butyl tubing overthe cables. See Figure 37. Slide the tub-ing far enough on the cables so that it ispositioned approximately two feet awayfrom the connectors.

Access ports

PVC pipe

Butyl tubing

Figure 35. Junction box.

Cables

Figure 36. Insert PVC pipe through access port.

Figure 37. Slide butyl tubing over cables.

29 682-505

INSTALLATION

Figure 40. Attach ground wire G1 to tank.

Figure 38. Insert cables through PVC pipe.

c. Carefully insert the connectors andcables through the three-inch PVC pipeinto the low-voltage compartment. SeeFigure 38.

d. Route the cables into the low-voltagecompartment and attach all connectorsusing the drawings provided. See Fig-ure 39.

Once all connections are made,straighten the cables within the low-voltage compartment and bundle themneatly by installing tie wraps.

e. Carefully insert ground wire G1 from thelow-voltage compartment through thePVC pipe into the main enclosure. Con-nect ground wire G1 to the copperground angle located on the tank usingthe shortest possible connection. SeeFigure 40.

Figure 39. Attach connectors.

682-505 30

INSTALLATION

f. If three-phase voltage sensing is speci-fied (Option D), then one ground wireper voltage sensor way is included withthe main cable assembly. Attach groundwires to the terminal block specified inthe drawings provided. See Figure 41.

g. While supporting the PVC pipe, stretchthe butyl tubing over the cables and overthe end of the PVC pipe by 1

¹⁄₂

inches.Install a large tie wrap around the diam-eter of the stretched butyl tubing that isoverlapping the PVC pipe.

h. Gather and twist the butyl tubing aroundthe cable bundle and apply tie wrapsalong the length of the excess butyl tub-ing. See Figure 42.

Figure 41. Attach ground wires to terminal block.

Figure 42. Stretch tubing over the PVC pipe and secure with tiewraps.

Finished cable connection assembly

To connect 120 volt ac power:

Connect the line and neutral to the fuseblock. See label under the fuse block. Refer toFigure 43. Then attach the ground to the plate.

Ç

CAUTION

Before connecting external power to thefuse block, reference the diagrams toensure proper polarity. Failure to do so cancause damage to the equipment.

Figure 43. Fuse block.

31 682-505

INSTALLATION

Low-Voltage Enclosure Wiring— Dry-Vault-Mounted Style

Step 37

Uncoil the main cables that will be routed tothe low-voltage enclosure. See Figure 44.These cables have low-voltage connectors ontheir ends.

Step 38

Using the conduit/tubing/bracket kit provided,feed the junction box main cables with con-nectors through the access port into the low-voltage enclosure, as follows.

a. Locate the conduit/tubing assembly andthe two holding brackets and bolts asshown in Figure 45.

b. Put the holding brackets in the groovedchannel of the conduit as shown in Fig-ure 46.

Wire pass

Bracket

Figure 44. Junction box.

Figure 45. Conduit/tubing bracket assembly kit, shipped with gear.

Figure 46. Place holding brackets in conduit channel.

Motor operator cables


Junction box

682-505 32

INSTALLATION

Bolts

Figure 47. Set and secure assembly through wire pass.

Figure 48. Channel cables through wire pass.

c. Slide the assembly through the wire pass(located in the bottom of the low-voltageenclosure.) Bolt the brackets down tothe enclosure floor as shown inFigure 47.

d. Gather the ends of the cables togetherand carefully insert the connectors andcables through the tubing and conduit,pushing them up into the low-voltageenclosure as shown in Figure 48.

33 682-505

INSTALLATION

e. If three-phase voltage sensing is speci-fied (Option D), then one ground wireper voltage sensor way is included withthe main cable assembly. Attach groundwires to the terminal block specified inthe drawings provided. See Figure 49.

f. Connect the heavy shielded cable to thecopper lug on the low-voltage enclosuregrounding plate. See Figure 51.

g. Once all connections are made,straighten the cables within the low-volt-age enclosure and bundle them neatly byinstalling the tie wraps.

h. Gather and twist the butyl tubing aroundthe cable bundle and apply tie wrapsalong the length of the excess tubing.

i. Route the cables into the low-voltageenclosure and attach all connectorsusing the drawings provided. SeeFigure 50.

Step 39

When grounding the low-voltage enclosure tothe Vista tank,

it is very important to have onesolid ground connection from the low-voltageenclosure to the Vista tank. Provisions forgrounding wires and clamps on the low-volt-age enclosure are provided on the bottommounting channel. Tank grounding instruc-tions are found on page 20 of this instructionsheet.



Ç

CAUTION

Before connecting external power to thefuse block, reference the diagrams toensure proper polarity.

Failure to do so

can cause damage to the equipment.

Figure 50. Connect shielded cable to copper lug.



682-505 34

INSTALLATION

Low-Voltage Enclosure Wiring Wet-Vault-Mounted and UnderCover Styles

Step 40

Uncoil the main cables that will be routed tothe low-voltage enclosure. These cables havelow-voltage connectors on their ends. SeeFigure 52.

Step 41

Route the main cables to the low-voltageenclosure.

Step 42

Position the low-voltage enclosure on the cus-tomer-supplied pad so that the cableentrances are properly aligned.

Step 43

Using the conduit/tubing/bracket kit provided,feed the main cables with connectors throughthe access port into the low-voltage enclosure,as follows.

a. Locate the conduit/tubing assembly andthe two holding brackets and bolts asshown in Figure 53.

b. Put the holding brackets in the groovedchannel of the conduit as shown in Fig-ure 54.

Packaged motor operators


Packaged current sensors

Wire pass

Bracket

Figure 52. Main cables.

Figure 53. Conduit/tubing bracket assembly kit, shipped with gear.

Figure 54. Place holding brackets in conduit channel.

35 682-505

INSTALLATION

Bolts

Figure 55. Set and secure assembly through wire pass.

Figure 56. Channel cables through wire pass.

c. Slide the assembly through the wire pass(located in the bottom of the low-voltageenclosure.) Bolt the brackets down tothe enclosure floor as shown inFigure 55.

d. Gather the ends of the cables togetherand carefully insert the connectors andcables through the tubing and conduit,pushing them up into the low-voltageenclosure as shown in Figure 56.

682-505 36

INSTALLATION

f. Connect the heavy shielded cable to thecopper lug on the low-voltage enclosuregrounding plate. See Figure 58.

g. Once all connections are made,straighten the cables within the low-volt-age enclosure and bundle them neatly byinstalling the tie wraps.

h. Gather and twist the butyl tubing aroundthe cable bundle and apply tie wrapsalong the length of the excess tubing.

i. Route the cables into the low-voltageenclosure and attach all connectorsusing the drawings provided. SeeFigure 59.

Step 44

When grounding the low-voltage enclosure tothe Vista tank,

it is very important to have onesolid ground connection from the low-voltageenclosure to the Vista tank. Provisions forgrounding wires and clamps on the low-volt-age enclosure are provided on the bottommounting channel. Tank grounding instruc-tions are found on page 20 of this instructionsheet.



Ç

CAUTION

Before connecting external power to thefuse block, reference the diagrams to en-sure proper polarity.

Failure to do so can

cause damage to the equipment.

Figure 58. Connect shielded cable to copper lug.



e. If three-phase voltage sensing is speci-fied (Option D), then one ground wireper voltage sensor way is included withthe main cable assembly. Attach groundwires to the terminal block specified inthe drawings provided. See Figure 57.

37 682-505

INSTALLATION

Set screw

Selector lever

Motor Operator Installation—Pad-Mounted and Dry-Vault-Mounted Styles

Step 45

Attach the motor operator to the gear. Placeeach motor operator over the operating shafton the gear. See Figure 60. Note: It may be nec-essary to manually rotate the motor operatorshaft (by twisting the operating disk) to lineup the operator key with the shaft notch key.See Figure 61.

Step 46

Remove the protective cap from the motoroperator mating plug. Insert motor operatorcable connector onto mating plug on operator,making sure the connector is keyed in prop-erly. Thoroughly tighten the connector ontothe mating plug by applying at least 4 full turnsto the connector.

Stop ring

Shaft

Notch key

Figure 60. Place the motor operator over the operating shaft on thegear.

Figure 61. Line up the operator key with the shaft notch key.

682-505 38

INSTALLATION

Bolt

Electrical operation mechanical blocking key

Operator mating plug

Figure 62. Connect the motor operator cable to the mating plug onthe operator.

Step 47

Secure each motor operator to the stop ringon the tank using the bolt provided. SeeFigure 62.

Step 48

An electrical operation mechanical blockingkey is attached to the back of the motor opera-tor with a chain. Fit this item into the operat-ing disk. See Figure 63.

Figure 63. Insert mechanical blocking key.

39 682-505

INSTALLATION

Motor Operator Installation—Wet-Vault-Mounted andUnderCover Styles

Step 49

Attach the motor operator to the gear. Placeeach motor operator over the operating shafton the gear. See Figure 64. Note: It may be nec-essary to manually rotate the motor operatorshaft (by twisting the operating disk) to line upthe operator key with the shaft notch key. SeeFigure 65.

Figure 64. Place the motor operator over the operating shaft on thegear.

Figure 65. Line up the operator key with the shaft notch key.

Stop ring

Shaft

Notch key

682-505 40

INSTALLATION

Figure 66. Secure the motor operator to the stop ring.

Step 50

Secure each motor operator to the stop ringon the tank using the bolt provided. SeeFigure 66.

Step 51

An electrical operation mechanical blockingkey is attached to the back of the motor opera-tor with a chain. Fit this item into the operat-ing disk. See Figure 67.

Figure 67. Insert mechanical blocking key.

41 682-505

INSTALLATION

Initial Testing ofMotor Operators and Controls

Step 52

Once all of the preceding steps have been suc-cessfully completed, turn on the batterycharger power switch. See Figure 68. This willconnect ac power to the battery charger andto the motor operator controls.

The motor operator controls will indicatethe correct position of the motor operatorsand mechanism operating shafts via LEDs onthe front panel assembly. See Figures 69and 70.

Figure 70. “Close” indication on motor control board matches motor operator position.

Figure 68. Turning on the power supply.

Figure 69. “Close” position indication on motor operator.

Power switch

Operating disk

Selector lever

Electrical-operation mechanical blocking key

Close LED

682-505 42

INSTALLATION

Step 53

Verify that all LEDs are functional by pressingthe “PUSH-TO-TEST-LAMPS” push button oneach control board. See Figure 71.

Step 54

Perform the following system test to ensureproper installation and operation. Location ofthe motor operator controls is shown inFigure 72.

•

Place the “LOCAL/REMOTE” switch into“LOCAL.” Perform the following operationsusing the control board buttons as shownin Figure 71. Verify that the motor operatormoves to the desired position and that thecontrol board LEDs also indicate theproper position. There is an electrical inter-face in the controls that will not allow theuser to move to/from the close positiondirectly from/to the ground position.

•

Close-to-Open

•

Open-to-Ground

•

Ground-to-Open

•

Open-to-Close

Note:

The electrical-operation mechanicalblocking key must be removed so it does notinterfere with the selector lever during opera-tion.

Step 55

For the optional RTU/Communication Devicecustom package: Place the “LOCAL/REMOTE”switch into the “REMOTE” position. Performthe tests described in Step 54 above with theuser-supplied SCADA or automation system.

Setting Up the Gear forOperation

Step 56

Place the “LOCAL/REMOTE” switch into“LOCAL.” Use the motor operator controls orthe manual handle to place the load switchesand fault interrupters in their desired operat-ing positions as shown in Figure 73.

Note:

The electrical-operation mechanicalblocking key must be removed so it does notinterfere with the selector lever during opera-tion.

Step 57

Program the overcurrent control per S&CInstruction Sheet 681-515. Write the controlsettings on the label provided on the overcur-rent controls enclosure.

Figure 71. Testing LEDs.

Figure 72. Location of motor operator controls.

Figure 73. Vault-style low-voltage enclosure shown with provisionsfor RTU and communications.

Push-to-test lamps button

43 682-505

INSTALLATION

Bottom ofenclosure

Front panelTerminationcompartment

Padlock

RTV silicon-rubber caulk


Front panel


Completing the Installation

Step 58

For Pad-Mounted Style:

A resilient closed-cell gasket on the bottom flange of the enclo-sure protects the finish from being scratchedduring installation and isolates it from thealkanlinity of a concrete foundation. Thisgasket also helps to seal the enclosure to thefoundation to guard against the entry ofrodents, insects, or weeds, and to discouragetampering.

In the event the gasket does not compen-sate for irregularities in the foundation, groutthe bottom of the enclosure as necessary. Anygrout applied should be recessed enough topermit caulking. To complete the installation,caulk around the bottom of the enclosure; aweatherproof silicon-rubber room tempera-ture vulcanizing (RTV) compound is recom-mended. Apply the caulk to fill the spacesbetween the cable and the conduit, and cap allempty conduits to prevent the entry of mois-ture and rodents. See Figure 74.

Step 59

Reinstall the front panels of the operation andtermination compartments. Lower the hingedroofs and secure them with the pentaheadbolts. Then insert a padlock into each hasp.Lock the low-voltage compartment or enclo-sure. See Figure 75.

Figure 74. Caulk around bottom of enclosure.

Figure 75. Lock the gear.

682-505 44

INSTALLATION

Red-oxide primer

Touch-up finish

Step 60

Wipe down the exterior of the enclosure witha clean, damp cloth. Refinish any scratches orabrasions with S&C touch-up finish and red-oxide primer which are available in aerosolspray cans. See Figure 76. Order CatalogNumber 9999-058 for olive green finish, 9999-080 for light gray finish, and 9999-061 for red-oxide primer. No other finish or primer isapproved. The area to be touched up shouldbe cleaned to remove all oil and grease. Sandthe area, removing any traces of rust that maybe present, and make sure that all edges arefeathered before applying primer.

Figure 76. S&C touch-up finish and red-oxide primer.

45 682-505

DIELECTRIC TESTING

Ç

WARNING

When performing electrical withstand tests on Vista switchgear,always observe the following precautions.

Failure to observe

these precautions can result in a flashover, injury, and

equipment damage.

1. Completely de-energize the switchgear and disconnect itfrom all power sources.

2. Terminate bushings with an insulated cap or other appropri-ate cable termination capable of withstanding the test volt-age.

3. Verify that the SF

6

pressure gauge is in the green zone.

MAXIMUM INSULATION TEST VOLTAGES

Vista Switchgear Rating, kV Withstand Test Voltage, kV

50 Hertz 60 Hertz Impulse (BIL) Power Frequency1

Dc23

12 15.5 95 27 42

24 27 125 40 62

36 38 150 50 82

1 The power-frequency withstand test voltages listed in the table areapproximately 80% of the design values for new equipment.2 The dc withstand test voltages listed in the table are approximately80% of the design values for new equipment.3 Dc withstand test voltages are given for reference only for those usersperforming dc withstand tests. The presence of these values does not

imply a dc withstand rating or performance requirements for the switch-gear. A dc withstand design test is specified for new equipment becausethe switchgear may be subjected to dc test voltage when connected to thecable. The dc withstand test values listed in the table are approximatelyequal to the ac peak test voltage.

Routine Switchgear Testing

For the convenience of users who normallyperform electrical tests on system compo-nents such as switchgear, appropriate with-stand test values for Vista switchgear aregiven in the table below. These test values aresignificantly greater than the normal operatingvoltage of the switchgear and are near theflashover voltage of the gear. They should beapplied only when the switchgear is com-pletely de-energized and disconnected fromall power sources.

Ç

CAUTION

On Vista switchgear equipped with internalvoltage transformers (option suffix “-Y4”):Do not apply test voltage greater thannormal system voltage to the B phase of theincoming source ways. Refer to diagrambelow to determine location of B phase ofincoming sourceways. If above is not fol-lowed, damage to the voltage transformerswill result.

X X

X Do not apply test voltage to phase B.

Dielectric testing on phases A and C can be performed usingstandard industry practices, in accordance with the warnings andmaximum test voltages indicated on this page. See below.

682-505 46

DIELECTRIC TESTING

Cable Testing and FaultLocating

Dc testing of installed cables is performed todetermine the condition of the cables and tolocate faults. Industry standards, such asIEEE 400, “IEEE Guide for Making High-Direct-Voltage Tests on Power Cable Systemsin the Field,” describe such testing and shouldbe referenced for selection of the test proce-dures. Dc testing also includes cable “thump-ing,” i.e., the sudden application of dc voltagefrom a large capacitor for the purposes offault locating, which causes transients andvoltage doubling at the end of the open cable.When the cables are attached to the switch-gear, the gear will also be subjected to the dctest voltages.

On A and C phases, cable testing can beperformed using standard industry practices,in accordance with the warnings and maxi-mum test voltages indicated on pages 44 and46. If testing is to be performed on a cableattached to phase B of any load-interrupterswitch or fault-interrupter way, the voltagetransformer, (if provided optionally), must beisolated from the test voltage. This can bedone by opening the load-interrupter switchway or fault-interrupter way connected to thecable that is being tested (or just open phase Bif it is a single-pole fault-interrupter way).

Ç

WARNING

The dc withstand capability of the switchgear may be reduceddue to aging, damage, gas leakage, or electrical or mechanicalwear. Therefore, the dc test voltage must be selected such that itdoes not exceed the withstand limits of the switchgear.

Applica-

tion of dc test voltages greater than the withstand capabil-

ity of the switchgear can result in a flashover, injury, and

equipment damage.

In addition, always verify that the SF

6

pressure gauge is inthe green zone before proceeding with any testing.

Ç

DANGER

Do not exceed the test voltages given in the table on pages 45and 47. Exceeding the test voltages can cause a flashover of theisolating gap or phase-to-phase insulation of the switchgear.

This can lead to a power-frequency fault in the gear or of

the dc test source and result in severe personal injury or

death.

47 682-505

DIELECTRIC TESTING

Vista switchgear has been designed to allowdc testing of the cables with the other ways ofthe gear energized. The integral groundingswitch may be used to ground the cable. Aftertesting, the dc test equipment should be usedto discharge any stored charge on the cablebefore grounding with the grounding switch.The dc test voltages and dc cable thumpingvoltages should not exceed the voltages givenin the table below.

MAXIMUM CABLE TEST AND CABLE THUMPING VOLTAGES

Vista Switchgear Rating, kVdc Cable Test Voltage, kV dc Cable Thumping

Voltage, kV1

50 Hertz 60 Hertz Impulse (BIL)

12 15.5 95 30 15

24 27 125 40 20

36 38 150 40 20

1 The dc cable thumping voltage is 50% of the dc cable test voltagebecause of voltage doubling that will occur at the open end of the cablewhich is assumed to be a unit of Vista switchgear. If the open end of the

cable is grounded, the dc cable thumping voltage applied to the cable andswitchgear can be increased to the dc cable test voltage.

Fault-Interrupter Testing

When performing dielectrical tests on Vistaswitchgear, the vacuum fault interrupters willnot be subject to voltage across the open gapbecause the disconnect switch will isolate thevacuum interrupter from the test voltage.Since the vacuum interrupter will not be ener-gized across the open gap, there is no expo-sure to X-rays that are normally associatedwith high-voltage testing of vacuum devices.Routine testing of the vacuum fault interrupt-ers is not recommended. For those users whodesire to test the vacuum interrupters, contactthe nearest S&C Sales Office for specificinstructions.

Ç

WARNING

When it is necessary to test the cables connected to a unit ofenergized switchgear, proper isolation of the power-frequencysource from the dc test source must be maintained. Follow therecommendations by the manufacturer of the dc test equipmentor fault-locating equipment. The user’s operating and safety pro-cedures should be followed for grounding the cable, connectingthe dc test source, isolating the dc test source (in case of flash-over), ungrounding the cable, applying the dc test source, dis-charging the cable, and regrounding the cable.

682-505 48

DIELECTRIC TESTING

VISTA SWITCHGEAR RATINGS12

Rating, kV

System ClassMax BIL

IEC ANSI

12

24

36

15.5

27

38

15.5

29

38

95

125

150

1 IEC ratings have been tested in accordance with the applicable por-tions of IEC 265-1 for a Class A switch.2 ANSI ratings have been tested in accordance with the applicable por-tions of ANSI C37.71, C37.72, and C37.73.

FAULT-INTERRUPTER AND LOAD-INTERRUPTER SWITCH RATINGS1234

ApplicableStandard

Amperes, RMS

Frequency,Hertz

Fault Interrupter Load-Interrupter Switch

Short-Circuit (Sym.)Cont.5

Load Splitting

(Parallel or Loop

Switching)5

LoadDrop-

ping56

Ten-Time Duty-Cycle

Fault-Closing (Sym.)

Ten-Time Duty-Cycle

FaultInterrupting

(Sym.)

Cont.

Load Splitting

(Parallel or Loop

Switching)

LoadDrop-ping6

Ten-TimeDuty-Cycle

Fault-Closing (Sym.)

Momentary (Sym.)

1 Sec. (Sym.)

IEC 50 or 60 200 200 200 12 500d

12 500 630 630 630 12 500d 12 500 12 500 12 500

ANSI 50 or 60 200 200 200 12 500d 12 500 600 600 600 12 500d 12 500 12 500 12 500

1 IEC ratings have been tested in accordance with the applicable por-tions of IEC 265-1 for a Class A switch.

2 ANSI ratings have been tested in accordance with the applicable por-tions of ANSI C37.71, C37.72, and C37.73.

3 The bus terminals of Model 201 are equipped with 200-ampere bush-ings wells, and the bus terminals of all other models are equipped with600-ampere bushings unless option suffix “-M4” is specified.

4 Contact the nearest S&C Sales Office for other possible ratings.

5 Fault interrupters furnished with optional 600-ampere bushings inlieu of 200-ampere bushing wells are rated 600 amperes (630 amperes forIEC) continuous, load splitting, and load dropping.

6 The fault-interrupter and load-interrupter switch can switch the mag-netizing current of transformers associated with the load-droppingrating. In addition, unloaded cable switching ratings are as follows: 10amperes at 15.5 kV and 20 amperes at 29 kV and 38 kV.

d 32,500 amperes peak.

49 682-505

SPECIFICATIONS

SWITCHGEAR STYLES

Item

Suffix tobe Added

to Switchgear

Catalog Number

Applicable toModels

Net Wt., Lbs.(Kg)

UnderCover Style. Includes stainless-steel tank, submersible wiring, and25-foot submersible control cable for attachment to mild-steel low-voltageenclosure

-U

201, 210, 211

1

320, 321, 330

413, 422, 431, 440

514, 523

624, 633

Dry-Vault-Mounted Style. Includes mild-steel tank and 15-foot control cable to mild-steel low-voltage enclosure. Does not include submersible wiring -V3 All models

2Wet-Vault-Mounted Style. Includes stainless-steel tank, submersible wiring, and 15-foot submersible control cable for attachment to mild-steel low-voltageenclosure

-V4 All models

Pad-Mounted Style. Includes mild-steel tank and pad-mounted enclo-sure for mounting switch-gear with integral low-voltage compartment ona pad.

Mild-Steel Options include mild-steel outer enclosure and low-volt-age compartment.

Stainless-Steel Options include stainless-steel outer enclosure and low-voltage compartment.

Two-wayunit

Mild-steelOlive green finish -P2 201, 210, 211

5343(240.3)

Light gray finish -P7 201, 210, 211

Stainless-steelOlive green finish -P12 201, 210, 211

Light gray finish -P17 201, 210, 211

Three- orfour-wayunit

Mild-steelOlive green finish -P4 320, 321, 330, 413, 422, 431, 440

6933(311.85)

Light gray finish -P9 320, 321, 330, 413, 422, 431, 440

Stainless-steelOlive green finish -P14 320, 321, 330, 413, 422, 431, 440

Light gray finish -P19 320, 321, 330, 413, 422, 431, 440

Five- orsix-wayunit

Mild-steelOlive green finish -P6 514, 523, 624, 633

9863(443.7)

Light gray finish -P11 514, 523, 624, 633

Stainless-steelOlive green finish -P16 514, 523, 624, 633

Light gray finish -P21 514, 523, 624, 633

1 Weight of low-voltage enclosure (less components) is 185 pounds,(83.25 kg).

2 Weight of low-voltage enclosure (less components) is 174 pounds,(78.3 kg).

3 Weight includes outer enclosure, base spacer, and empty low-voltagecompartment.

682-505 50

SPECIFICATIONS

COMMUNICATION AND CONTROL EQUIPMENT

Item

Suffix tobe Added

to Base Catalog Number

Applicable toModels

Custom Communication and Control Package. Includes user-specified remote terminal unit (RTU), user-specified communication device, battery charger, and battery packs. Requires user-supplied 120-volt 50/60 Hz ac external power source for battery charger. Other voltages are available upon request

f All

Control Unit for Use With RTU by Others. Includes provisions for mounting user-supplied, user-installed RTU and communication device in low-voltage enclosure or compartment. Also includes battery charger and battery packs. Requires user-supplied 120-volt 50/60 Hz ac external power source for bat-tery charger. Other voltages are available upon request

-Y3 All

Control Unit for Use Without RTU. Includes pushbuttons for local control of motor operators, LED posi-tion indicators, operation counter, battery charger, and battery packs. Requires user-supplied 120-volt 50/60 Hz ac external power source for battery charger. Other voltages are available upon request

-Y6 All

Internal Control Power. Voltage transformer mounted inside the Vista UDS tank supplies control power to battery charger and battery packs. This option increases the tank size by one way. For example, the tank of a Model 422 with internal control power is now a 5-way sized tank

-Y4All, through

5 ways

f Contact your nearest S&C Sales Office for application and pricingassistance.

MOTOR OPERATOR OPTIONS—“A” Option Suffix

Item Total Number of Motor-Operated Wayson the Gear12

Motor Operator Package. Includes motor-operator for use on a load-interrupter switch way or on a three-pole fault-interrupting way; motor-operator control board with “CLOSE,” “OPEN,” and, optionally “GROUND” pushbuttons; push-to-test indicator lamps; operation counter; and adapter for portable remote-control station. There is only one “LOCAL/REMOTE” switch for the entire gear. Also includes connections for the external user-supplied control power; the “close,” “open,” and optionally, “ground” command inputs; and switch-position indication

1

2

3

4

5

6

1 Refer to the “How to Order” section on pages 4 through 6 to computethe total number of motor-operated ways on the gear and to generate theproper option suffix for the motor operator option.

2 Each motor operator weighs 24.5 pounds, (11.03 kg).

51 682-505

SPECIFICATIONS

SENSING OPTIONS FOR MOTOR-OPERATED WAYS

Item Total Number of Motor-Operated Ways with Sensing Options12

Current SensingThree-Phase Current Sensing.Includes three current sensors for each way selectedOption Suffix “-B”

1

2

3

4

5

6

Voltage SensingSingle-Phase Voltage Sensing.Includes single-phase line-to-ground voltage sensing for each way selectedOption Suffix “-C”

1

2

3

4

5

6

1 Refer to the “How to Order” section on pages 4 through 6 to computethe total number of motor-operated with current sensing and to generatethe proper option suffix for the current sensing.

2 Refer to the “How to Order” section on pages 4 through 6 to com-pute the total number of motor-operated ways with each type of voltagesensing and to generate the proper option suffix for the desired voltagesensing.

682-505 52

SPECIFICATIONS

Item

Suffix tobe Added

to Switchgear

Catalog Number

Applicable to Models

Stainless-Steel Tank. Applicable only to Dry-Vault-Mounted Style and Pad-Mounted Style switchgear -S

201, 210, 211

320, 321, 330

413, 422, 431, 440

514, 523

624, 633

Stainless-Steel Low-voltage Enclosure. Applicable only to UnderCover Style and Vault-Mounted Style switchgear -E All

Mounting Provisions for FaultIndicator for Each Load-Interrupter Switch. Applicable only to Pad-Mounted Style switch-gear

NOTE: Accommodates three-phase indicator with single-phase sensors

Without viewing window in pad-mounted enclosure -F1

210, 211, 413, 514

320, 321, 422, 523, 624

330, 431, 633

440

With viewing window in pad-mountedenclosure -F2d

210, 211, 413, 514

320, 321, 422, 523, 624

330, 431, 633

440

Three-Pole Manual Fault Interrupter in lieu of single-pole.

Note: Number of ways indicate the number of fault interrupter ways using three-pole mecha-nism. Replaces single-pole fault interrupters from left to right. For example, Catalog Num-ber 944222-T1 would include—from left to right—two load switches, one three-pole fault interrupter, and one single-pole fault interrupter1

One way -T1 201, 211, 321, 413, 422, 431, 514, 523, 624, 633

Two ways -T2 413, 422, 514, 523, 624, 633

Three ways -T3 413, 514, 523, 624, 633

Four ways -T4 514, 624

Five ways -T5 Special models with 5 fault interrupters

Six ways -T6 Special models with 6 fault interrupters

Control cable for UnderCover Style Switchgear (25-foot length is standard) connects Vista UDS tank to low-voltage enclosure

35-foot length (10.7 m) -J35All

45-foot length (13.7 m) -J45

Control cable for Vault-Mounted Style Switch-gear (15-foot length is standard) connectsVista UDS tank to low-voltage enclosure

25-foot length (7.35 m) -H25

All35-foot length (10.7 m) -H35

45-foot length (13.7 m) -H45

Ground-Position Pushbutton Control2. Provides local motor operation to and from the “ground” position. Remote operation to and from the “ground” position is accomplished via Scada or through a hard-wired connection activated via a pushbutton control

-G All

1 Contact your nearest S&C Sales Office for other possible configura-tions.

2 Applies to all motor operated ways in the gear.

d When ordering optional feature “-F2” for use with a stainless-steelpad-mounted enclosure, specify suffix “-F12” instead of “-F2.”

TABLE CONTINUED v

OPTIONAL FEATURES

53 682-505

SPECIFICATIONS

OPTIONAL FEATURES—Continued

Item

Suffix tobe Added

to Switchgear

Catalog Number


600-Ampere Bushings without Studs, at load-interrupter switch and bus terminals -M1

211, 413, 514

210, 321, 422, 523, 624

320, 330, 431, 633

440

600-Ampere Bushings in lieu of 200-Ampere Bushing Wells, at fault interrupter and bus terminals

Without studs -M2

211, 321, 431

201, 422

413, 523, 633

514, 624

With studs -M3

211, 321, 431

201, 422

413, 523, 633

514, 624

200-Ampere Bushing Wells in lieu of 600-Ampere Bushings, at load-interrupter switch andbus terminals1

-M4

211, 413, 514

210, 321, 422, 523, 624

320, 330, 431, 633

440

Arc Resistance for Vault-Mounted Style Vista (Arc Resistance is standard for pad-mountedand UnderCover Styles), per IEC 298 Appendix AA, for arcs occurring internal to the VistaUDS tank (15 cycles, 12 kA symmetrical)

-N Vault-Mounted Styles only

Two-Hole Ground Pads, one per way, located below bushings or bushing wells (in lieu ofstandard one-ground pad per tank)

-O

201, 210, 211

320, 321, 330

413, 422, 431, 440

514, 523

624, 633

Remote Low-Pressure Alarm—Includes internal contact for remote low-pressure indi-cation, with wiring to outside of tank

With wires routed on tank for future customer connections

-R11 For Pad-Mounted and Dry-Vault-Mounted installation styles

-R12 For UnderCover and Wet-Vault-Mounted installation styles

With wiries terminated in enclosure that is furnished with a terminal block for customer connection

-R2 Only available for Pad-Mounted andDry-Vault-Mounted Styles

1 Except for the Model 201, all bus terminals are normally equippedwith 600-ampere bushings.

TABLE CONTINUED v

682-505 54

SPECIFICATIONS

OPTIONAL FEATURES—Continued

Item

Suffix tobe Added

to Switchgear

Catalog Number


External Trip Provisions, allows three-pole tripping of single-pole or three-pole fault interrupters via a trip signal from a remote location or an external relay. Requires 120 Vac control power2

In addition tostandard over-current controlfor all faultinterrupters

For Pad-Mounted and Dry-Vault-Mounted installation styles -R31

201, 211, 321, 422, 431

413, 514, 523, 624, 633

For UnderCover and Wet-Vault-Mounted installation styles -R32

201, 211, 321, 422, 431

413, 514, 523, 624, 633

In lieu of stan-dard overcurrent control and current trans-formersfor all faultinterrupters

For Pad-Mounted and Dry-Vault-Mounted installation styles -R41

201, 211, 321, 431

422

413, 523, 633

514, 624

For UnderCover and Wet-Vault-Mounted installation styles -R42

201, 211, 321, 431

422

413, 523, 633

514, 624

Potential Indication with Test Feature. Includes LCD display to indicate presence of voltage on each phase, and solar panel to supply power for testing of complete voltage-indication circuit and phasing circuit (if furnished). One potential indi-cator is provided for each bus-terminal, load-interrupter switch, and fault-interrupter way

Without provisions for low-voltage phasing -L1

201, 210, 211

320, 321, 330

413, 422, 431, 440

514, 523

624, 633

With provisions for low-voltagephasing -L2

201, 210, 211

320, 321, 330

413, 422, 431, 440

514, 523

624, 633

Copper Bus -Z5

201, 210, 211

320, 321, 330

413, 422, 431, 440

514, 523

624, 633

1 Contact your nearest S&C Sales Office if single-pole remote tripping isdesired.

55 682-505

SPECIFICATIONS

ACCESSORIES

Item Catalog Number

Overcurrent-Control Adapter Cable. Required for programmingovercurrent control

For connecting control to user-furnished personal computer in the field

For personal computers having 25-pin serial communication port TA-2366


For connecting control (removed from its enclosure) to user-furnished personal computer in the shop



Portable Remote Control for Permanent Motor Operator. Requires one of the control cables listed below TA-2424

25-foot length Control Cable for Portable Remote Control for Permanent Motor Operator 9931-615

50-foot length Control Cable for Portable Remote Control for Permanent Motor Operator 9931-616

Pentahead Socket, for ¹⁄₂-inch drive 9931-074

Portable Motor Operator. Permits operation of load-interrupter switches and single- or three-pole fault interrupters from a remote location. Includes carrying case and 50-foot length control cable with remote controls, utilizes powersupplied by

User-furnished 12-volt battery andbattery charger 38320

S&C-furnished 2-volt battery andbattery charger 38322

S&C-furnished ac input power supply 38323

TOUCH-UP KIT COMPONENTS—Aerosol Coatings in 9-Ounce Cans

Item Catalog Number

S&C Light Gray Outdoor Finish 9999-080

S&C Olive Green (Munsell 7GY3.29/1.5) Outdoor Finish 9999-058

S&C Red-Oxide Primer 9999-061

s&c remote supervisory vista underground … current sensor, voltage sensor, and motor operator...

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