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Source-Transfer Vista
Underground Distribution Switchgear
This green leaf icon designates information specifically for Vista® Green Underground Distribution Switchgear
that uses a CO
mix insulating gas. Unless otherwise designated, instructions provided apply to all Vista switch-
2
gear products
Table of Contents
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November 18, 2024
© S&C Electric Company 1999-2024, all rights reserved
®
Installation
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Related Manuals for S&C Source-Transfer Vista Underground Distribution Switchgear
Summary of Contents for S&C Source-Transfer Vista Underground Distribution Switchgear
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Page 1: Table Of Contents
Source-Transfer Vista Pad-Mounted, Dry-Vault Mounted, Wet-Vault ® Underground Distribution Switchgear Mounted, and UnderCover™ Styles Installation This green leaf icon designates information specifically for Vista® Green Underground Distribution Switchgear that uses a CO mix insulating gas. Unless otherwise designated, instructions provided apply to all Vista switch- gear products Table of Contents Introduction... -
Page 2: Introduction
Introduction Qualified Persons WARNING Only qualified persons knowledgeable in the installation, operation, and maintenance of overhead and underground electric distribution equipment, along with all associated hazards, may install, operate, and maintain the equipment covered by this publication . A qualified person is someone trained and competent in: ●... -
Page 3: Retain This Instruction Sheet
Introduction Along with this instruction sheet are copies of: ● S&C Instruction Sheet 683-510, “Source-Transfer Vista® Underground Distribution Switchgear, Pad-Mounted, Dry-Vault Mounted, Wet-Vault Mounted, and UnderCover™ Styles: Operation” ● S&C Instruction Sheet 681-530, “Vista® Underground Distribution Switchgear: Programming” ● For models with batteries: S&C Instruction Sheet 680-540, “Remote Supervisory Vista®... -
Page 4: Safety Information
Safety Information Safety Information Understanding Several types of safety-alert messages may appear throughout this instruction sheet and on labels and tags attached to the source-transfer Vista Underground Distribution Switch- Safety-Alert gear. Become familiar with these types of messages and the importance of these various Messages signal words: DANGER... -
Page 5: Location Of Safety Labels
Safety Information Location of Safety Labels Pad-mounted enclosure Low-voltage compartment Top and termination side of switchgear Top of switchgear (manual unit shown for illustration purposes) Reorder Information for Safety Labels Location Safety Alert Message Description Part Number WARNING Keep Out—Hazardous Voltage Inside . G-6681 DANGER Hazardous Voltage—Always Consider Circuits and Components Live …... -
Page 6: Safety Precautions
Safety Precautions Safety Precautions DANGER Vista Underground Distribution Switchgear operate 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 7: Shipping And Handling
Shipping and Handling Packing Inspection Pad-mounted style Vista switchgear consists of the Examine the shipment for external evidence of damage gas-tight tank (SF ) or hermetically sealed tank (CO as soon after receipt as possible, preferably before mix) and the outer enclosure, which has the low-voltage removal from the carrier’s conveyance. -
Page 8: Handling
Shipping and Handling Handling WARNING Lifting points When handling an enclosure or tank with an overhead hoist, observe standard lifting practices and the general instructions below . Failure to follow these precautions can result in serious personal injury or equipment damage . NOTICE Refer to the nameplate affixed to exterior of switchgear assembly for the net weight . - Page 9 Shipping and Handling Arrange the hoist slings so the lifting forces are STEP 2 . equally distributed between the lifting tabs. Lift the tank or enclosure into position per the STEP 3 . appropriate installation section. Avoid sudden starts and stops. NOTICE The low-voltage enclosure is not submersible .
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Page 10: Installation-Pad-Mounted Style
Installation—Pad-Mounted Style Enclosure Removal Pentahead wrench with extender NOTICE Custom-engineered single-lift designs are available so the tank and enclosure can be lifted together . Unless a custom single-lift design has been specified, the enclosure must be removed from the tank to be lifted or equipment damage may result . For pad-mounted style Vista switchgear, follow these Termination compartment Removable panel... - Page 11 Installation—Pad-Mounted Style Remove the removable panel from the oper- STEP 4 . ation compartment and the upper removable Upper panel from the termination compartment by removable panel loosening the fasteners securing the panels in removed place and lifting the panels upward. Set the (not shown) Front panels aside in a safe, clean place.
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Page 12: Tank Placement
Installation—Pad-Mounted Style Tank Placement Shipping Bushings shown Shipping For pad-mounted style Vista switchgear, complete the covers with covers removed covers following steps for tank placement: Remove any packing or foam from around the STEP 1 . viewing window and check the gas-pressure gauge to make sure it is in the Green zone. -
Page 13: Units With Base Spacers
Installation—Pad-Mounted Style Units With Base Spacers Note: Pad-mounted Vista switchgear with base spacers is also designed to accommodate a two-lift installation. When installing pad-mounted Vista switchgear with base spacers, the enclosure above the base-spacer connection should be removed first. The base spacers and tank-sup- port rails remain connected to the base of the tank. -
Page 14: Cable Terminations
Installation—Pad-Mounted Style Cable Terminations Shipping covers Bushings Shipping covers DANGER are provided for shown with are provided for bushing wells covers removed bushings Before energizing the switchgear, replace the shipping covers on all bushings and bushing wells with elbows or insulated protective caps . Failure to replace the shipping covers on all bushings with elbows or caps can result in a flashover and serious personal injury or death . -
Page 15: Enclosure Placement
Installation—Pad-Mounted Style Enclosure Placement Four ⅝ -inch Note: When installing the pad-mounted enclosure over dia . anchor the tank, place the side of the enclosure with the “Termi- bolts by user Anchor bracket nation Compartment” label over the terminators and the Enclosure side of the enclosure with the “Operation Compartment”... -
Page 16: Grounding
Installation—Pad-Mounted Style Grounding Complete the following steps to properly ground pad-mounted style Vista switchgear: Connect the cable concentric-neutral ground STEP 1 . wires to the grounding system as appropriate. Enclosure ground pad Connect the ground pad of the tank and the STEP 2 . - Page 17 Installation—Pad-Mounted Style Use the equivalent of 4/0 copper (or cable STEP 3 . sized in accordance with the user’s standard Low voltage practice) in either a single or multiple connec- compartment tion to realize the maximum momentary rating Operation compartment of the switchgear. For a multiple connection, cables smaller than 1/0 copper or equivalent should not be used.
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Page 18: Current Sensors
Installation—Pad-Mounted Style Current Sensors NOTICE Each S&C current sensor has a unique magnitude ratio and phase-angle shift . These values are used to calibrate the current-sensing inputs to the user- supplied remote terminal unit (RTU) . The magnitude ratio and phase-angle shift of each current sensor must be recorded on the yellow card provided in accordance with the way and phase on which the current sensor will be installed . - Page 19 Installation—Pad-Mounted Style Remove the ¼–20 gap nut on one of the current STEP 5 . sensors. Open the sensor and place it around the appropriate high-voltage cable. There is an “H” polarity mark embossed on the current sensor. All three current sensors for each way must be installed with the polarity marks facing in the same direction.
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Page 20: Fault Indicators
Installation—Pad-Mounted Style Fault Indicators Fault indicators are to be furnished by the user and installed in accordance with the manufacturer’s instruc- tions. Optional mounting provisions for fault indicators (catalog number suffix “-F1,” “-F2,” “-F3,” or “-F4”) are available. If mounting provisions are specified, mount the fault indicators on the mounting brackets. -
Page 21: Low-Voltage Compartment Wiring
Installation—Pad-Mounted Style Low-Voltage Compartment Wiring Junction box Motor operator cables Complete the following steps to route the low-voltage compartment wiring for pad-mounted style Vista switchgear: NOTICE Failure to follow wiring and grounding instructions will result in electronic damage and may cause nuisance operation . - Page 22 Installation—Pad-Mounted Style (c) There will be up to three pairs of ground wires, VS-G1 and VS-G2, that are included VS-G1 and VS-G2 Temporary grounding leads in the main enclosure. See your wiring diagram for details. VS-G1 and VS-G2 wires are marked with a hanging Notice tag. Disconnect the VS-G1 and VS-G2 ground wires from the temporary grounding leads and route them into the low-voltage...
- Page 23 Installation—Pad-Mounted Style Fully seat each plug, and tighten the retaining screws for each connector, making sure none of the individual conduc- tor’s pins were backed out during seating. An example of a conductor pin that is backed out is shown in connection 5. See Figure 32.
- Page 24 Installation—Pad-Mounted Style (f) Gather and twist the butyl tubing around the cable bundle and apply the largest tie-wrap over the PVC pipe and butyl tubing. Gather the excess butyl tubing and attach the smaller tie-wrap over the cable and tubing. See Figure 34. To connect external control power, connect the STEP 3 .
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Page 25: Motor Operator Installation
Installation—Pad-Mounted Style Motor Operator Installation Complete the following steps to install the motor opera- tor(s) for pad-mounted Vista switchgear: Place each motor operator over the operating STEP 1 . shaft on the gear. See Figure 36. Note: It may be necessary to manually rotate the motor operator shaft (by twisting the oper- ating disk) to line up the operator key with the shaft notch key. -
Page 26: Initial Testing Of Motor Operators And Controls
Installation—Pad-Mounted Style Initial Testing of Motor Operators and Controls Where voltage transformers internal to the tank provide power for the motor operators and controls, test acces- sory TA-2669 is necessary to power the controls when the gear is not energized. Refer to S&C Instruction Sheet 515-510 for instructions on how to connect and operate the test accessory. - Page 27 Installation—Pad-Mounted Style Verify all LEDs are functional by pressing the STEP 3 . PUSH TO TEST LAMPS button on each control board. See Figure 43. On the Micro-AT® Source-Transfer Control, STEP 4 . place the MANUAL/AUTOMATIC switch into PUSH TO TEST LAMPS button Manual mode. See Figure 44. Perform the following operations using the control board buttons as shown in Figure 43: Verify the motor operator moves to the...
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Page 28: Setting Up The Gear For Operation
Installation—Pad-Mounted Style Setting Up the Gear for Operation Follow these steps to set up the switchgear for operation: Use the motor operator controls or the STEP 1 . manual handle to place the load switches and fault interrupters in their desired operating positions. -
Page 29: Completing The Installation
Installation—Pad-Mounted Style Completing the Installation NOTICE A resilient closed-cell gasket on the bottom flange of the enclo sure protects the finish from being scratched during installation and isolates it from the alkalinity of a concrete foundation . This gasket also helps to seal the enclosure to the foundation to guard against the entry of rodents, insects, or RTV silicon rubber caulk weeds, and to discourage tampering . -
Page 30: Installation-Dry-Vault Mounted Style
Installation—Dry-Vault Mounted Style Tank Placement Complete the following steps to place the tank for Shipping Bushings shown Shipping covers with covers removed covers dry-vault mounted style Vista switchgear: Remove any packing or foam from around the STEP 1 . viewing window and check the gas-pressure gauge to make sure it is in the Green Zone. -
Page 31: Cable Terminations
Installation—Dry-Vault Mounted Style Cable Terminations Shipping covers Shipping covers DANGER are provided for are provided for bushing wells bushings Before energizing the switchgear, replace the shipping covers on all bushings and bushing wells with elbows or insulated protective caps . Failure to replace the shipping covers on all bushings with elbows or insulated protective caps can result in a flashover and serious... -
Page 32: Low-Voltage Enclosure Placement
Installation—Dry-Vault Mounted Style Low-Voltage Enclosure Placement Complete the following steps to place the enclosure for dry-vault mounted style Vista switchgear: Unbolt the low-voltage enclosure from its skid STEP 1 . Tank ground pad and set it upright if necessary, observing the precautions given in the “Handling”... -
Page 33: Current Sensors
Installation—Dry-Vault Mounted Style Current Sensors NOTICE Each S&C current sensor has a unique magnitude ratio and phase-angle shift . These values are used to calibrate the current-sensing inputs to the user- supplied remote terminal unit (RTU) . The magnitude ratio and phase-angle shift of each current sensor must be recorded on the yellow card provided in accordance with the way and phase on which the current sensor will be installed . - Page 34 Installation—Dry-Vault Mounted Style Remove the ¼–20 gap nut on one of the current STEP 5 . sensors. Open the sensor and place it around the appropriate high-voltage cable. There is an “H” polarity mark embossed on the current sensor. All three current sensors for each way must be installed with the polarity marks facing in the same direction.
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Page 35: Low-Voltage Enclosure Wiring
Installation—Dry-Vault Mounted Style Low-Voltage Enclosure Wiring Junction box Motor operator cables NOTICE Failure to follow wiring and grounding instructions will result in electronic damage, and may cause nuisance operation . Complete the following steps to route the low-voltage compartment wiring for dry-vault mounted style Vista switchgear. - Page 36 Installation—Dry-Vault Mounted Style (d) Gather the ends of the cables together and carefully insert the connectors and cables through the tubing and conduit, pushing them up into the low-voltage enclosure as shown in Figure 62. (e) Route the cables into the low-voltage enclosure and attach all connectors to the Vista switchgear rack backplane board using the drawings provided.
- Page 37 Installation—Dry-Vault Mounted Style (g) Connect the heavy-shielded cable to the copper lug on the low-voltage enclosure grounding plate. See Figure 67. (h) When all connections are made, straighten the cables within the low-voltage enclosure and bundle them neatly by installing the tie wraps. (i) Gather and twist the butyl tubing around the cable bundle and apply the tie wraps along the length of the excess tubing.
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Page 38: Motor Operator Installation
Installation—Dry-Vault Mounted Style Motor Operator Installation Complete the following steps to install the motor opera- tor(s) for dry-vault mounted style Vista switchgear: Place each motor operator over the operating STEP 1 . shaft on the gear. See Figure 68. Note: It may be necessary to manually rotate the motor operator shaft (by twisting the oper- ating disk) to line up the operator key with the shaft notch key. -
Page 39: Initial Testing Of Motor Operators And Controls
Installation—Dry-Vault Mounted Style Initial Testing of Motor Operators and Controls NOTICE Do not test switchgear without batteries connected . This can result in a misoperation . Power In cases where voltage transformers internal to the tank supply provide power for the motor operators and controls, test switch accessory TA-2669 is necessary to power the controls when the gear is not energized. - Page 40 Installation—Dry-Vault Mounted Style Perform the following operations using the STEP 4 . control board buttons, as shown in Figure 75: Verify the motor operator moves to the desired position among the four noted below and the control board LEDs also indicate the proper position. See Figure 76 (There is an electrical interface in the controls that will not allow the user to move to/from the Close position directly from/to the Ground...
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Page 41: Setting Up The Gear For Operation
Installation—Dry-Vault Mounted Style Setting Up the Gear for Operation Follow these steps to set up the switchgear for operation: Use the motor operator controls or the STEP 1 . manual handle to place the load switches and fault interrupters in their desired operating positions. -
Page 42: Installation-Wet-Vault Mounted Style
Installation—Wet-Vault Mounted Style Tank Placement Complete the following steps to place the tank for Shipping Bushings shown Shipping covers with covers removed covers wet-vault mounted style Vista switchgear: Remove any packing or foam from around the STEP 1 . viewing window and check the gas-pressure gauge to make sure it is in the Green zone. -
Page 43: Cable Terminations
Installation—Wet-Vault Mounted Style Cable Terminations Shipping covers Shipping covers DANGER are provided for are provided for bushing wells bushings Before energizing the switchgear, replace the shipping covers on all bushings and bushing wells with elbows or insulated protective caps . Failure to replace the shipping covers on all bushings with elbows or insulated protective caps can result in a flashover and serious... -
Page 44: Low-Voltage Enclosure Placement
Installation—Wet-Vault Mounted Style Low-Voltage Enclosure Placement The standard low-voltage enclosure is not submersible. Complete the following steps to place the enclosure for wet-vault mounted style Vista switchgear: Unbolt the low-voltage enclosure from its skid STEP 1 . and set it upright if necessary, observing the precautions given in the “Handling”... -
Page 45: Grounding
Installation—Wet-Vault Mounted Style Grounding Complete the following steps to properly ground wet-vault mounted style Vista switchgear: Connect the cable concentric-neutral ground STEP 1 . Tank ground pad wires to the grounding system as appropriate. See Figure 81. Ground in accordance with the user’s standard Connect the ground pad of the tank to the STEP 2 . -
Page 46: Current Sensors
Installation—Wet-Vault Mounted Style Current Sensors NOTICE Each S&C current sensor has a unique magnitude ratio and phase-angle shift . These values are used to calibrate the current sensing inputs to the user- supplied RTU . The magnitude ratio and phase-angle shift of each current sensor must be recorded on the yellow card provided in accordance with the way and phase on which the current sensor will be installed . - Page 47 Installation—Wet-Vault Mounted Style Secure the current sensors to the high- STEP 4 . voltage cable below the cable terminator using the plastic tie wraps furnished. If the cable has a grounded concentric neutral, the current sensor must be secured in one of the following ways: (a) It may be placed around the concentric neutral, in which case the concentric...
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Page 48: Low-Voltage Enclosure Wiring
Installation—Wet-Vault Mounted Style Low-Voltage Enclosure Wiring Complete the following steps to route the low-voltage compartment wiring for wet-vault mounted style Vista switchgear: Uncoil the main cables that will be routed STEP 1 . to the low-voltage enclosure. These cables have low-voltage connectors on their ends. See Figure 86. - Page 49 Installation—Wet-Vault Mounted Style (d) Gather the ends of the cables together and carefully insert the connectors and cables through the tubing and conduit, pushing them up into the low-voltage enclosure as shown in Figure 90. (e) Route the cables into the low-voltage enclosure and attach all connectors to the Vista switchgear rack backplane board using the drawings provided.
- Page 50 Installation—Wet-Vault Mounted Style (f) There will be up to three pairs of ground wires, VS-G1 and VS-G2, that are included in the main enclosure. See the wiring diagram for details. Attach the ground wires to the terminal block specified in the drawings provided, and fully tighten the set screws.
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Page 51: Motor Operator Installation
Installation—Wet-Vault Mounted Style Motor Operator Installation Complete the following steps to install the motor opera- tor(s) for wet-vault mounted style Vista switchgear: Place each motor operator over the operating STEP 1 . shaft on the gear. See Figure 96. Note: It may be necessary to manually rotate the motor operator shaft (by twisting the oper- ating disk) to line up the operator key with the shaft notch key. -
Page 52: Initial Testing Of Motor Operators And Controls
Installation—Wet-Vault Mounted Style Initial Testing of Motor Operators and Controls NOTICE Do not test switchgear without batteries connected . This can result in a misoperation . Power In cases where voltage transformers internal to the tank supply provide power for the motor operators and controls, test switch accessory TA-2669 is necessary to power the controls when the gear is not energized. - Page 53 Installation—Wet-Vault Mounted Style Verify all LEDs are functional by pressing the STEP 2 . PUSH TO TEST LAMPS button on each control board. See Figure 103. On the Micro-AT Source-Transfer Control, STEP 3 . place the MANUAL/AUTOMATIC switch into PUSH TO TEST LAMPS button Manual mode.
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Page 54: Setting Up The Gear For Operation
Installation—Wet-Vault Mounted Style Setting Up the Gear for Operation Follow these steps to set up the switchgear for operation: Use the motor operator controls or the manual STEP 1 . handle to place the load switches and fault interrupters in their desired operating posi- tions. -
Page 55: Installation-Undercover™ Style
Installation—UnderCover™ Style Tank Placement Complete the following steps to place the tank for Shipping Bushings shown Shipping covers with covers removed covers UnderCover Style Vista switchgear: Remove any packing or foam from around the STEP 1 . viewing window and check the gas-pressure gauge to make sure it is in the Green zone. -
Page 56: Cable Terminations
Installation—UnderCover™ Style Cable Terminations Shipping covers Shipping covers DANGER are provided for are provided for bushing wells bushings Before energizing the switchgear, replace the shipping covers on all bushings and bushing wells with elbows or insulated protective caps . Failure to replace the shipping covers on all bushings with elbows or insulated protective can result in a flashover and serious personal injury or death . -
Page 57: Low-Voltage Enclosure Placement
Installation—UnderCover™ Style Low-Voltage Enclosure Placement Complete the following steps to place the enclosure for UnderCover Style Vista switchgear: Unbolt the low-voltage enclosure from its skid STEP 1 . and set it upright if necessary, observing the precautions given under the “Handling” section on page 8. -
Page 58: Grounding
Installation—UnderCover™ Style Grounding Complete the following steps to properly ground the UnderCover Style Vista switchgear: Connect the cable concentric-neutral ground STEP 1 . Tank ground pad wires to the grounding system as appropriate. See Figure 111. Ground in accordance with the user’s standard Connect the ground pad of the tank to the STEP 2 . -
Page 59: Current Sensors
Installation—UnderCover™ Style Current Sensors NOTICE Each S&C current sensor has a unique magnitude ratio and phase-angle shift . These values are used to calibrate the current sensing inputs to the user- supplied RTU . The magnitude ratio and phase-angle shift of each must be recorded on the yellow card provided in accordance with the way and phase on which the current sensor will be installed . - Page 60 Installation—UnderCover™ Style Open the sensor with the sensor-release tool STEP 3 . provided. Place the sensor around the appro- priate high-voltage cable. All three current sensors for each way must be installed with the polarity marks facing in the same direction. There is an “H”...
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Page 61: Low-Voltage Enclosure Wiring
Installation—UnderCover™ Style Low-Voltage Enclosure Wiring Complete the following steps to route the low-voltage compartment wiring for UnderCover Style Vista switchgear: Uncoil the main cables that will be routed STEP 1 . to the low-voltage enclosure. These cables have low-voltage connectors on their ends. See Figure 116. - Page 62 Installation—UnderCover™ Style (d) Gather the ends of the cables together and carefully insert the connectors and cables through the tubing and conduit, pushing them up into the low-voltage enclosure as shown in Figure 120. (e) Route the cables into the low-voltage enclosure and attach all connectors to the Vista switchgear rack backplane board using the drawings provided.
- Page 63 Installation—UnderCover™ Style (f) There will be up to three pairs of ground wires, VS-G1 and VS-G2, that are included in the main enclosure. See your wiring diagram for details. Attach the ground wires to the terminal block specified in the drawings provided, and fully tighten the set screws.
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Page 64: Motor Operator Installation
Installation—UnderCover™ Style Motor Operator Installation Complete the following steps to install the motor opera- tor(s) for UnderCover Style Vista switchgear: Place each motor operator over the operating STEP 1 . shaft on the gear. See Figure 126. Note: It may be necessary to manually rotate the motor operator shaft (by twisting the oper- ating disk) to line up the operator key with the shaft notch key. -
Page 65: Initial Testing Of Motor Operators And Controls
Installation—UnderCover™ Style Initial Testing of Motor Operators and Controls NOTICE Do not test switchgear without batteries connected . This can result in a misoperation . Power In cases where voltage transformers internal to the tank supply provide power for the motor operators and controls, test switch accessory TA-2669 is necessary to power the controls when the gear is not energized. - Page 66 Installation—UnderCover™ Style Verify all LED displays are functional by STEP 2 . pressing the PUSH TO TEST LAMPS push on each control board. See Figure 133. On the Micro-AT Source-Transfer Control, STEP 3 . place the MANUAL/AUTOMATIC switch into PUSH TO TEST LAMPS button Manual mode.
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Page 67: Setting Up The Gear For Operation
Installation—UnderCover™ Style Setting Up the Gear for Operation Follow these steps to set up the switchgear for operation: Use the motor operator controls or the manual STEP 1 . handle to place the load-interrupter switches and fault interrupters in their desired operating positions. -
Page 68: Gas-Pressure Gauge
Gas-Pressure Gauge Understanding the Gas-Pressure Gauge Orange zone Green zone Green/Yellow zone Red zone Vista switchgear incorporates a temperature-compen- sated gas-pressure gauge inside the tank to provide indication of the insulating gas pressure. The gas-pres- sure gauge includes four distinct color-coded zones. See Figure 135, Figure 136, and Figure 137 on page 69. -
Page 69: Gauge Needle Fluctuations From Rapid Ambient Temperature Changes
Gas-Pressure Gauge Gauge Needle Fluctuations from Rapid Ambient Temperature Changes When the Vista switchgear tank experiences rapid changes in ambient temperature, the gas-pressure gauge needle may temporarily move to indicate a higher gas pressure when the tank is rapidly cooled or a lower gas pressure when the tank is rapidly heated. -
Page 70: Dielectric Testing
Dielectric Testing Routine Switchgear Testing For the convenience of users who normally perform elec- trical tests on system components such as switchgear, appropriate withstand test values for Vista Underground Distribution Switchgear are given in Table 1 and in Table 2 on page 72. These test values are significantly greater than the normal operating voltage of the switchgear and are near the flashover voltage of the gear. -
Page 71: Dc Cable Testing And Fault Locating
Dielectric Testing Dc Cable Testing and Fault Locating Dc testing of installed cables is performed to determine the condition of the cables and to locate faults. Industry standards like IEEE 400, “IEEE Guide for Making High- Direct-Voltage Tests on Power Cable Systems in the Field,”... - Page 72 Dielectric Testing DANGER Do not exceed the test voltages given in Table 2 . Exceeding the test voltages can cause a flashover of the isolating gap or phase-to-phase insulation of the switchgear . This can lead to a power-frequency fault in the gear or the dc test source, and result in severe personal injury or death .
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Page 73: Very Low Frequency (Vlf) Cable Testing
Dielectric Testing Very Low Frequency (VLF) Cable Testing WARNING WARNING When VLF cable testing has been completed, or has been interrupted, you must discharge the cable The VLF ac withstand capability of the switchgear system and the test equipment . Allow the time may be reduced because of aging, damage, needed to fully discharge the cable system and test gas leakage, or electrical or mechanical wear . - Page 74 Dielectric Testing VLF cable testing may subject the Vista Underground Distribution Switchgear to the ac test voltage when the cables are attached to the switchgear. S&C recommends the Vista switchgear be completely de-energized and disconnected from all power sources when performing VLF cable testing.
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Page 75: Fault-Interrupter Testing
Dielectric Testing Fault-Interrupter Testing When performing dielectrical tests on Vista Underground Distribution Switchgear, the vacuum fault interrupters will not be subject to voltage across the open gap because the disconnect switch isolates the vacuum interrupters from the test voltage. Because the vacuum interrupter will not be energized across the open gap, there is no exposure to the X-rays normally associated with high-voltage testing of vacuum devices. - Page 76 Dielectric Testing NOTICE Current-carrying surface DO NOT take resistance measurements from the threaded area of the bushing stud . Resistance measurements taken through the threads of the bushing stud will be inaccurate . See Figure 139 . Clamp or touch the voltage-carrying probes of the resistance-measuring device to the flat conductive surface of the bushings that make up the current carrying path.
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Page 77: Long-Term Storage
Long-Term Storage Pad-Mounted Style Source- Transfer Vista Switchgear Pad-mounted source-transfer Vista switchgear tanks are designed to be in a pad-mounted enclosure. Pad-mounted source-transfer Vista switchgear can be stored outdoors on its shipping skid until installation. The tank should remain as shipped, i.e. inside the pad-mount enclosure. (See the “Low-Voltage Enclosures (LVE)”...
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