Liquid-filled, medium-voltage S-VFI pad-mounted transformer specification

Liquid-Filled, Medium-Voltage s-vfi Pad-Mounted Transformers

SECTION 26 12 19.02

Eaton Guide SpecificationComment by Note to Specwriter: Delete this text before printing or copying

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section 26 12 19.02

Liquid-Filled, Medium-Voltage s-vfi Pad-Mounted Transformers

generalScopeThis specification applies to three-phase, 45–12,000 kVA, 50-60 Hz, dead front or live front, compartmental pad-mount transformers. Transformer overcurrent protection shall be accomplished utilizing a 24VDC microprocessor-based feeder relay paired with a resettable vacuum fault interrupter (VFI) which shall be provided with three-pole ganged operation. [The unit shall have a motor operator] [The unit shall have motor operator provisions] [the unit shall be manually operated]. Comment by Note to Specwriter: Select oneThe VFI unit is to be used for transformer [[primary] [secondary] protection & local/remote on/off switch] [transformer loop protection] [dual feed VFI protection] [transformer & loop protection].Comment by Note to Specwriter: Choose VFI on primary or secondary of transformer for standard protectionComment by Note to Specwriter: Select required VFI protectionThe unit is to be insulated with Envirotemp™ FR3™ less-flammable dielectric fluid. The unit shall utilize vacuum interrupters for all fault current interruption such that the dielectric media is not consumed or contaminated by normal operations of the interrupters. The unit shall be designed for installation on a concrete or fiberglass pad at ground level. The transformer shall use resettable interrupter controls and shall not use expulsion fuses (use of PRCLFs for increased interrupt rating are allowable).This specification shall only cover the purchase and shipment of transformers. The purchaser and/or user shall be responsible for all site-work, electrical connections, and installation.Applicable StandardsAll characteristics, definitions, and terminology, except as specifically covered in this specification, shall be in accordance with the latest revision of the following IEEE®, Department of Energy, and NEMA® standards.IEEE Std C37.60™-2012 standard – IEEE Standard Requirements for Overhead, Pad-Mounted, Dry Vault, and Submersible Automatic Circuit Reclosers and Fault Interrupters for Alternating Current Systems Up to 38 kVIEEE Std 386™-2016 standard – Standard for Separable Insulated Connector Systems for Power Distribution Systems Above 600 V.IEEE Std C37.90™-2005 standard – IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus.IEEE Std C37.90.2™-2004 standard – Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers.IEEE Std C57.12.00™ standard – Standard for Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers.IEEE Std C57.12.28™ standard – Pad-Mounted Equipment - Enclosure Integrity.IEEE Std C57.12.29™ standard - IEEE Standard for Pad-Mounted Equipment - Enclosure Integrity for Coastal Environments – applicable when stainless steel construction is specified.IEEE Std C57.12.34™ standard – IEEE Standard Requirements for Pad-Mounted, Compartmental-Type, Self-Cooled, Three-Phase Distribution Transformers (2500 kVA and Smaller) - High Voltage: 34500GrdY/19920 Volts and Below; Low-Voltage: 480 Volt 2500 kVA and Smaller (issued in March 2005 - combines C57.12.22 and C57.12.26). – applicable when padmount style transformer is specifiedIEEE Std C57.12.90™ standard – IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers and IEEE Guide for Short-Circuit Testing of Distribution and Power Transformers.IEEE Std C57.12.91™ standard – Guide for Loading Mineral-Oil-Immersed Transformers.IEEE Std C57.154™ -2012 – IEEE Standard for the Design, Testing, and Application of Liquid-Immersed Distribution, Power, and Regulating Transformers Using High-Temperature Insulation Systems and Operating at Elevated TemperaturesNEMA TR 1-1993 (R2000) – Transformers, Regulators and Reactors, Table 0-2 Audible Sound Levels for Liquid-Immersed Power Transformers.NEMA 260-1996 (2004) – Safety Labels for Pad-Mounted Switchgear and Transformers Sited in Public Areas.10 CFR Part 431 – Department of Energy – Energy Conservation Program for Commercial Equipment: Distribution Transformers Energy Conservation Standards; Final Rule.ProductsManufacturersA. Eaton Comment by Note to Specwriter: List additional approved manufacturers, if any.B. __________C. __________ratingsThe transformer shall be designed in accordance with this specification and the base kVA rating shall be one of the following:[45] [75] [112.5] [225] [300] [500] [750] [1000] [1500] [2000] [2500] [3000] [3750] [5000] [7500] [10000] kVAComment by Note to Specwriter: Select oneThe transformer shall have a high voltage and the basic lightning impulse insulation level (BIL) of ____ V and ____ kV BIL (For standard BIL transformers select HV and BIL ratings from Table 1 using the standard transformer column for BIL. For Critical load (CLT) or Hardened Datacenter (HDC) designs requiring higher BIL ratings select HV and BIL from table 1 using the CLT/HDC column for BIL. CLT/HDC designs require FR3 high fire point fluid))Comment by Note to Specwriter: Delete this section if dual voltage primary requiredComment by Note to Specwriter: Enter value for primary voltageComment by Note to Specwriter: Enter value for BILThe transformer shall have a dual high voltage to be reconnected with an externally operable, de-energized switch. The voltages provided and the basic lightning impulse insulation level (BIL) shall be _________ x________ V and ___ kV BIL (For standard BIL transformers select HV and BIL ratings from Table 1 using the standard transformer column for BIL. For Critical load (CLT) or Hardened Datacenter (HDC) designs requiring higher BIL ratings select HV and BIL from table 1 using the CLT/HDC column for BIL). Dual voltage HV ratings shall not exceed a 3:1 ratio. CLT/HDC designs require FR3 high fire point fluid))Comment by Note to Specwriter: Delete this section if single voltage primary requiredComment by Note to Specwriter: Enter value for dual voltage primaryComment by Note to Specwriter: Enter value for BILThe low voltage and the basic lightning impulse insulation level (BIL) shall be ________ V and __ kV BIL. (For standard BIL transformers select LV and BIL ratings from Table 1 using the standard transformer column for BIL. For Critical load (CLT) or Hardened Datacenter (HDC) designs requiring higher BIL ratings select LV and BIL from table 1 using the CLT/HDC column for BIL. CLT/HDC designs require FR3 high fire point fluid))Comment by Note to Specwriter: Enter value for voltageComment by Note to Specwriter: Enter value for BIL

Table 1

Transformer Ratings and Electrical

Characteristics

Transformer

Basic Impulse Insulation Level – BIL (kV)

Voltage Ratings (volts)

Standard Transformers

CLT/HDC Transformers

Secondary Voltages

208Y/120

480Y/277

575Y/332

600Y/347

690Y/398

240 Delta

480 Delta

240 Delta with 120 Mid-Tap

480 Delta with 240 Mid-Tap

30

30

30

30

30

30

30

30

30

45

45

45

45

45

45

45

45

45

Primary Voltages

2400 Delta

4160 Delta

4800 Delta

7200 Delta

12000 Delta

12470 Delta

13200 Delta

13800 Delta

14400 Delta

16340 Delta

34500 Delta

43800 Delta

4160GrdY/2400

8320GrdY/4800

12470GrdY/7200

13200GrdY/7620

13800GrdY/7970

22860GrdY/13200

23900GrdY/13800

24940GrdY/14400

34500GrdY/19920

43800GrdY/25300

60

60

60

75

95

95

95

95

95

95

150

-

60

75

95

95

95

125

125

125

150

-

95

95

95

95

125

125

125

125

125

125

200

250

95

95

125

125

125

150

150

150

200

250

** Note to Specifier – The above table is not meant to list every voltage available.

(note: CLT/HDC designs require FR3 high fire point fluid)Comment by Note to Specwriter: Delete note before printing or copying

The transformer may be furnished with full capacity high-voltage taps. The tap changer shall be clearly labeled to reflect that the transformer must be de-energized before operating the tap changer as required in Section 4.3 of IEEE Std C57.12.34™-2009 standard. The tap changer shall be operable on the higher voltage only for transformers with dual voltage primaries. The unit shall have one of the following tap configurations:[]No TapsComment by Note to Specwriter: Insert x in the brackets next to the desired tap configuration[]Two – 2 ½% taps above and below rated voltage (split taps)[]Four – 2 ½% taps below rated voltage (four below)[]NEMA taps (14400, 13800, 13200, 12470, 12540)[]Non-standard tap configuration _________________Comment by Note to Specwriter: If checked, Enter values for non-standard tapsThe average winding temperature rise above ambient temperature, when tested at the transformer rating, shall be: (note: 75 rise designs require FR3 high fire point fluid)Comment by Note to Specwriter: Delete note before printing or copying[]65°C average winding temperature rise rating. The above winding temperature rise shall not exceed 65°C when loaded at base kVA rating.Comment by Note to Specwriter: Insert x in the brackets next to desired temperature rise rating[]75°C average winding temperature rise rating. The above winding temperature rise shall not exceed 75°C when loaded at base kVA rating. This transformer is identified as a PEAK transformer.[]55/65°C average winding temperature rise rating. The above winding temperature rise shall not exceed 55°C when loaded at base kVA rating. The transformer shall provide an additional 12% continuous operating capacity at the 65°C rating.[]65/75°C average winding temperature rise rating. The above winding temperature rise shall not exceed 65°C when loaded at base kVA rating. The transformer shall provide an additional 12% continuous operating capacity at the 75°C rating. This transformer is identified as a PEAK transformer. []55/75°C average winding temperature rise rating. The above winding temperature rise shall not exceed 55°C when loaded at base kVA rating. The transformer shall provide an additional 22% continuous operating capacity at the 75°C rating. This transformer is identified as a PEAK transformer.The percent impedance voltage, as measured on the rated voltage connection, shall be per Table 2. For target impedances, the tolerance on the impedance shall be +/- 7.5% of nominal value for impedance values greater than 2.5%. The tolerance on the impedance shall be +/- 10.0% for impedance values less than or equal to 2.5%.Table 2

Percent Impedance Voltage

kVA Rating (Low voltage < 700 V)

Impedance

75

1.10 - 5.75

112.5-300

1.40 - 5.75

500

1.70 - 5.75

750-3750

5.75 nominal

kVA Rating

Low voltage > 700 V (all nominal values)

150 kV BIL

200 kV BIL

250 kV BIL

1000 - 5000

5.75

7.00

7.50

7500 - 10000

6.50

7.00

7.50

ConstructionThe core and coil shall be vacuum processed to ensure maximum penetration of insulating fluid into the coil insulation system. While under vacuum, the windings will be energized to heat the coils and drive out moisture, and the transformer will be filled with preheated filtered degassed insulating fluid. The core shall be manufactured from burr-free, grain-oriented silicon steel and shall be precisely stacked to eliminate gaps in the corner joints. The coil shall be insulated with B-stage, epoxy coated, diamond pattern, insulating paper, which shall be thermally cured under pressure to ensure proper bonding of conductor and paper. Coils shall be [copper] [aluminum] [either aluminum or copper]. Comment by Note to Specwriter: Select one. Preferred is either aluminum or copper which maximizes cost/size optimizationThe dielectric coolant shall be listed less-flammable fluid meeting the requirements of National Electrical Code Section 450-23 and the requirements of the National Electrical Safety Code (IEEE Std C2™-2002 standard), Section 15. The dielectric coolant shall be non-toxic*, non-bioaccumulating and be readily and completely biodegradable per EPA OPPTS 835.3100. The base fluid shall be 100% derived from edible seed oils and food grade performance enhancing additives. The fluid shall not require genetically altered seeds for its base oil. The fluid shall result in zero mortality when tested on trout fry *. The fluid shall be certified to comply with the US EPA Environmental Technology Verification (ETV) requirements and tested for compatibility with transformer components. The fluid shall be Factory Mutual Approved®, UL® Classified Dielectric Medium (UL-EOUV) and UL® Classified Transformer Fluid (UL-EOVK), Envirotemp™ FR3™ fluid.*(Per OECD G.L. 203)

Note: The transformer can be supplied with mineral oil as the dielectric coolant. Replace the above statement with “Transformer will be supplied with mineral oil as the dielectric coolant.” If mineral oil is chosen, the following designs will not be available as they require FR3 high fire point fluid. Comment by Note to Specwriter: Delete note before printing or copying

· 75°C, 65/75°C, and 55/75°C PEAK transformers

· HDC or CLT designs

Tank and Cabinet EnclosureThe high-voltage and low-voltage compartments, separated by a metal barrier, shall be located side-by-side on one side of the transformer tank. When viewed from the front, the low-voltage compartment shall be on the right. Each compartment shall have a door that is constructed so as to provide access to the high-voltage compartment only after the door to the low-voltage compartment has been opened. There shall be one or more additional fastening devices that must be removed before the high-voltage door can be opened. Where the low-voltage compartment door is of a flat panel design, the compartment door shall have three-point latching with a handle provided for a locking device. Hinge pins and associated barrels shall be constructed of corrosion-resistant material, passivated ANSI® Type 304 or the equivalent.A recessed, captive, penta-head or hex-head bolt that meets the dimensions per IEEE Std C57.12.28™-2014 standard shall secure all access doors.The compartment depth shall be in accordance with IEEE Std C57.12.34™-2009 standard, unless additional depth is specified.The tank base must be designed to allow skidding or rolling in any direction. Lifting provisions shall consist of four lifting lugs welded to the tank.The tank shall be constructed to withstand 7 psi without permanent deformation, and 15 psi without rupture. The tank shall include a 15 psig pressure relief valve with a flow rate of minimum 35 SCFM.The exterior of the unit shall be painted Munsell 7GY3.29/1.5 green (STD), ANSI® 70 gray, or ANSI® 61 gray in color. If a special paint color is specified, a federal spec number or paint chip must be provided at the time of order. The cabinet interior and front plate shall be painted gray for ease of viewing the inside compartment.The tank shall be complete with an anodized aluminum laser engraved nameplate. This nameplate shall meet Nameplate B per IEEE Std C57.12.00™-2010 standard.High Voltage Bushings and TerminalsHigh voltage bushings will be installed in the high voltage termination compartment located on the front left of the transformer and requiring access via the low voltage termination compartment on the front right.Bushing Style[]15/25 KV DEADFRONT, CURRENTS BELOW 200 AMPS: The high voltage bushings shall be 15/25 kV 200A bushing wells with bushing well inserts installed. The bushings shall be externally removable and be supplied with a removable stud (Re: Catalog Data CA800016EN, 500-12, and 500-26).Comment by Note to Specwriter: Insert an X in the brackets next to desired bushing style[]35 KV DEADFRONT, CURRENTS BELOW 200 AMPS: The high voltage bushing shall be a one-piece, 150 kV, 200-amp large interface load-break bushing (Re: Catalog Data CA800021EN).[]15/25/35 KV DEADFRONT, CURRENTS ABOVE 200 AMPS: The high voltage bushing shall be a 600A dead-break primary one-piece bushing externally removable, 3Ø rated, integral design. An optional 900 A bushing is available upon request (Re: Catalog Data CA800025EN and CA800020EN).[]15/25/35 KV LIVEFRONT, 200 KV BIL MAX: The high voltage bushing shall be a porcelain bushing with a [two-hole spade] [four-hole spade] [six-hole spade] [eyebolt connector].Comment by Note to Specwriter: If checked, Select oneBushing Configuration[]15/25 KV RADIAL FEED DEADFRONT: The transformer shall be provided with three (3) high voltage bushings in accordance with [Figure 1 dimensions] [Figure 4A dimensions] (Figure 1 is standard. Figure 4a dimensions may be specified when a larger termination compartment for greater working space is desired) from IEEE Std C57.12.34™-2009 standard for radial feed configurations. The bushing heights shall be in accordance with [Figure 3 dimensions] [Figure 6 dimensions] (Figure 3 is standard. Figure 6 dimensions may be specified for greater bushing height) of IEEE Std C57.12.34™-2009 standard.Comment by Note to Specwriter: If checked select oneComment by Note to Specwriter: Delete notes before printing or copyingComment by Note to Specwriter: If checked, select oneComment by Note to Specwriter: Delete notes before printing or copying[]15/25 KV LOOP FEED DEADFRONT: The transformer shall be provided with six (6) high voltage bushings in accordance [Figure 2 dimensions] [Figure 5A dimensions] (Figure 2 is standard. Figure 5a dimensions may be specified when a larger termination compartment for greater working space is desired) of IEEE Std C57.12.34™-2009 standard for loop feed configurations. The bushing heights shall be in accordance with [Figure 3 minimum dimensions] [figure 6 dimensions] (Figure 3 is standard. Figure 6 dimensions may be specified for greater bushing height) of IEEE Std C57.12.34™-2009 standard.Comment by Note to Specwriter: If checked, select oneComment by Note to Specwriter: Delete notes before printing or copyingComment by Note to Specwriter: If checked, select oneComment by Note to Specwriter: Delete notes before printing or copying[]35 KV RADIAL FEED DEADFRONT: The transformer shall be provided with three (3) high voltage bushings in accordance with Figure 4b dimensions of IEEE Std C57.12.34™-2009 standard for radial feed configurations. The bushing heights shall be in accordance with Figure 6 dimensions of IEEE Std C57.12.34™-2009 standard.[]35 KV LOOP FEED DEADFRONT: The transformer shall be provided with six (6) high voltage bushings in accordance with Figure 5c dimensions of IEEE Std C57.12.34™-2009 standard for loop feed configurations. The bushing heights shall be in accordance with Figure 6 dimensions of IEEE Std C57.12.34™-2009 standard.[]15/25/35 KV LIVEFRONT, 150 KV BIL MAX: The transformer shall be provided with three (3) bushings in accordance with Figure 9 of IEEE Std C57.12.34™-2009 standard for radial feed configurations. The bushing heights shall be in accordance with Figure 10 of IEEE Std C57.12.34™-2009 standard.Low Voltage Bushings and TerminalsBushing StyleVoltages less than 700 Volts: The transformer shall be provided with tin-plated spade-type bushings for vertical takeoff. The spacing of the connection holes shall be 1.75” on center, per IEEE Std C57.12.34™-2009 standard Figure 13a. The quantity of connection holes shall be 4, 6, 8, 12, 16, or 20 holes. Transformers 300 kVA and below, and 500 kVA with 480Y/277 secondary will have two-piece low voltage bushings with studs and screw on spades. Transformers 500 kVA with 208Y/120 secondary and all transformers above 500 kVA will have one-piece bushings.Table 3Standard / Maximum Bushing Hole QuantitiesKVA208Y/120480Y/277 and higher45-3004 standard, 16 maximum4 standard, 16 maximum5006 standard, 12 maximum4 standard, 16 maximum750-150012 standard, 20 maximum6 standard, 12 maximum2000-3750 N/A 12 standard, 20 maximum(Re: Catalog Data CA800017EN, CA800023EN, and CA800018EN)Bushing supports shall be provided for transformers requiring 10 or more connection holes. Bushing supports shall be affixed to the cabinet sidewalls; tank-mounted supports mountings are not acceptable.Bushing ConfigurationThe transformer shall be provided with bushings in a staggered arrangement in accordance with [Figure 11a dimensions] [Figure 12A dimensions] (Figure 11A is standard. Figure 12a dimensions may be specified when a larger termination compartment for greater working space is desired) of IEEE Std C57.12.34™-2009 standard.Comment by Note to Specwriter: Select oneComment by Note to Specwriter: Delete notes before printing or copyingVoltages greater than 700 Volts: Secondary arrangements shall be live-front or dead-front. Dead-front application with a required neutral shall have a porcelain X0 bushing. Dead-front application may be loop feed when specified. Provide additional front barrier for high voltage live front secondary, creating an additional barrier after the low voltage door has been opened. Dead front bushings are limited to below 900amps.SwitchingThe primary switching scheme provided with the transformer shall beComment by Note to Specwriter: Insert an X in the brackets next to desired switching options[][One (only available option for radial feed)] [two] [three] on-off under-oil load-break switch(s)Comment by Note to Specwriter: If checked, Select 1,2 or 3 switches[]One four-position [V] [T]-blade load-break sectionalizing switch. Refer to Appendix 1 for the schematics of these switching options (Re: Catalog Data CA800005EN and CA800019EN).Comment by Note to Specwriter: If checked, Select V or T blade switch[]Make-before-break option for four-position, sectionalizing switch: This switch option provides improved system reliability by eliminating momentary interruptions during switching operations.[]External Visible Loadbreak On/Off switch: The external visible loadbreak switch allows customers to visibly confirm that the transformer is de-energized without having to expose themselves to dangerous arc flash in the transformer compartment.[]External Visible Loadbreak On/Off/Ground switch: The external visible loadbreak switch allows customers to visibly confirm that the transformer is de-energized without having to expose themselves to dangerous arc flash in the transformer compartment. This feature also allows the end user to ground the transformer using the load break switch. Overvoltage Protection []Deadfront bushings: (maximum 150 kV BIL, for voltages up to 18 kV delta and 35 kV grounded wye). Externally mounted, Distribution Class M.O.V.E. Dead-front elbow arresters shall be supplied. (Re: Catalog Data 235-65.) M.O.V.E. arresters are for installation on 200 A rated dead-front bushing interfaces only. If transformer bushings are rated 600 A or 900 A, BT-TAP elbow connectors, T-OP II elbow connectors, or 600 A bushing adapters, each with a load-reducing tap plug for arrester connection, are required (Re: Catalog Data CA235018EN and CA235012EN).Comment by Note to Specwriter: Insert an X in the brackets next to desired overvoltage protection options[]Livefront bushings: (up to 200 KV BIL). Distribution- and Intermediate-Class arresters shall be supplied beneath the high-voltage bushings (Re: Catalog Data CA235018EN and CA235012EN).[]Under oil: (for voltages up to 27 kV delta and 35 KV grounded wye). Internally mounted, Distribution Class MOV under-oil surge arresters shall be supplied (Re Catalog Data CA235023EN).[]Optional Accessory: Three (3) disconnect switches shall be included to disconnect the under-oil arresters from ground for transformer testing (Re: Catalog Data 800-51).To demonstrate the increased power reliability requirement to the mission critical load by reducing the possibility of transformer failure, the manufacturer shall provide the following with the proposal; test documentation to demonstrate the transformer design proposed is able to withstand switching transient voltages and avoid harmful resonant frequencies without the use of a snubber circuit or a system study. (note: CLT/HDC designs require FR3 high fire point fluid)Comment by Note to Specwriter: Delete this section if CLT or HDC designs are not requiredComment by Note to Specwriter: Delete note before printing or copyingIntegral vacuum fault interrupterRatingsThe switchgear shall be rated* [15 kV, 12.5 kA] [15 kV, 16 kA] [25 kV] [35 kV] as follows:Comment by Note to Specwriter: Select one

Nominal Voltage

15 kV

15 kV

25 kV

35 kV

Maximum Design Voltage, kV

15.5

15.5

27.0

38.0

BIL, kV

95

95

125

150

1-Minute Withstand Voltage (60 Hz), kV

 

35

35

60

70

Momentary Current, 10 Cycles (sym.), kA

 

12.5

16.0

12.5

12.5

3-second Withstand Current (sym.), kA

 

12.5

16.0

12.5

12.5

Fault Interrupter

Continuous Current, (max), A

900

900

900

900

Interrupting Current (sym./asym.)

12.5/20.0

16/25.8

12.5/20.0

12.5/20.0

Making Current (sym.), kA

12.5

16.0

12.5

12.5

Cable Charging Interrupting Current, A

10.0

10.0

25.0

40.0

Load-Break Switch

Continuous Current, (max), A

600

600

600

600

Load Switching, A

600

600

600

600

Fault Making, kA (sym./asym.)

12.5/20.0

16/25.8

12.5/20.0

12.5/20.0

Minimum Full Life Fault Interrupting Duty Cycleper IEEE Std C37.60™-2003 standard (2 duty cycles)

Number of Operations

Percent of Interrupting Current Rating:

15-20%

88

88

88

88

45-55%

112

112

112

112

90-100%

32

32

32

32

Total

232

232

232

232

* Continuous and short-circuit currents may be limited by ratings of selected bushings.Vacuum Fault InterruptersThe transformer shall incorporate a vacuum fault interrupter for overcurrent protection, such that the major dielectric media is never contaminated by circuit interruption arc products. The interrupter shall be manually resettable, with no consumable parts (i.e. fuses). The maximum interrupting time from issuance of a trip signal from the electronic control shall be 2 cycles.The vacuum fault interrupter may be tripped via the incorporated relay control by sensing anomalies in the system provided there is adequate sensing equipment also incorporated into the transformer. That is, the VFI may be tripped (opened) in the event of anomalies such as, but not limited to, overcurrent, over/undervoltage, over temperature, over pressure, under frequency, etc. provided the appropriate associated devices are also incorporated into the transformer (i.e. potential transformers, thermometers, pressure relief devices, transducers, etc.) and the appropriate relay control is selected.To maximize safety to the operator, the interrupter shall incorporate a trip-free mechanism to prevent the possibility of holding the interrupter mechanism closed under a faulted circuit condition.The vacuum fault interrupter shall act as a three-phase group operated circuit breaker. The trip mechanisms for each phase shall be mechanically linked and the electronic control shall be set so that an overcurrent condition on any one phase shall simultaneously trip all three phases. A single operating handle shall be provided for manual opening, reset and closing. The operating handle(s) shall be mounted on the front plate of the tank in close relation to the VFI being controlled and shall have three distinct operating positions corresponding to the vacuum fault interrupter positions of closed, open, or tripped. A pointer attached to the handle shall be provided for ready identification of the handle’s position. The handle shall be designed for operation with a lineman’s hot stick and have a push to close / pull to open / pull to reset operation requiring no more than 75 lbs. of force and 60 degrees of movement for complete operation. Except when equipped with the optional motor operator, when the vacuum fault interrupter is tripped by automatic action of the VFI control, the operating handle shall drop to an intermediate position between its closed and open positions, to provide indication that it is tripped. The operating handle assembly shall include provisions to padlock the handle in the open position.Electronic Trip ControlThe protective relays for the transformer protection shall be a single multifunction, microprocessor-based relay that incorporates feeder overcurrent protection for the primary or secondary of a two-winding transformer. Relay will have fixed or variable percentage, using one or two settable slopes with adjustable intersection points and minimum pickup. The relay shall be Eaton device type EDR-3000, EDR-5000, or approved equal feeder relay having all, but not limited to, the features and functions herein specified.Relay shall be wired to directly trip the VFI mechanism.The relay shall be a solid-state microprocessor-based multifunctional type that operates from a 5 ampere or 1 ampere secondary output of current transformers. The relay shall provide ANSI 50/51 protective functions, and ANSI 50/51N or 50/51G ground fault protection functions for each winding as shown on the plans or as determined by the coordination study. The relay shall be configurable between true rms or fundamental sensing for each phase and ground. Ground element shall be capable of being utilized in residual, zero sequence, ground source connection schemes, or deactivated.The current transformer ratings being used for percentage overcurrent protection, phase, negative sequence, and ground protection feeding device shall have primary current ratings from 1 through 10,000 amperes. Relay may be programmable for current transformers 1 through 50,000 amperes. Provide phase and ground (as applicable) CT’s on transformer primary. CTs will be connected to transformer relay via test switches within control cabinet. CT ratio shall be as appropriate for the full amp output of the given transformer kVA rating.Control cabinet will be equipped with ABB test switches as needed for application or approved equalControl cabinet will be supplied with terminal block for customer connectionsControl cabinet will be supplied with 24V UPS system supplied by 120VAC from internal CPT and 12VDC from cabinet mounted 12V battery capable of 24hour back up (optional: customer supplied power)Control cabinet to include heaterControl cabinet will be NEMA 4X, UL listed, 100% stainless steel boxThe relay shall provide, but is not limited to, the following protection devices:Phase overcurrent (50/51): Four inverse time and instantaneous overcurrent (50/51-1, 50/51-2, 50/51-3, 50/51-4) functions with adjustable time delay. The element is assigned to either the primary or secondary side of the transformer.Ground overcurrent (50R/51R): One inverse time overcurrent (51R) function and one instantaneous overcurrent (50R) function from calculated values with adjustable time delay. The element can be assigned to either side of the transformer.The phase, negative sequence, and ground protection curves shall be independently field-selectable. Curves shall be selectable from the following:IEEE: Moderately inverse, very inverse, extremely inverseIEC: A, B, C or DThermal: Flat, lt, I2t, I4t The relay shall have 8 contact outputs that may be programmed for any protection function operation outputThe relay shall have a front panel display of relay condition, and 7 programmable LEDs that can be used for trip condition or breaker statusThe relay shall have a LCD display with LED background illumination capable of displaying the following information with metering accuracy of +/- half (0.5) percent of measured value (ln) for ln < 2 ln and +/- one (1) percent of measured value (ln) for ln > 2:Relay will be able to measure the following values from the transformer (*voltage and power measurements require inclusion of PTs and PT inputs):Individual RMS and fundamental phase currentsGround RMS and fundamental currentPhase-to-ground and phase-to-phase voltages with phase anglesWattsVarsVAFrequencyPower factor – apparent and displacementMinimum/maximum values of current, voltage, watts, vars, VA, frequency, apparent pf and displacement pf phase anglesRelay shall have the following features:Trip coil-monitoring and IRIG-BZone selective interlocking capability Real-time clock for stamping of events, trips and minimum/maximum values with 1ms time resolution or betterUser interface for programming and retrieving data from the front of the unit without additional equipmentFour (4) contact inputs that are user programmableContinuous self-testing of internal circuitry, self-diagnostic capability. Programmable lockout/self-reset after trip function (86 lockout)Programmable set points for device curve selectionProgrammable inputs, such as current transformer ratiosRelay shall be suitable for operating temperatures from -20 degrees to 60 degrees C. Relay shall be suitable for operating with humidity from 0 to 95% relative humidity Relay shall record information on the last 20 faults including:Date, time, and currents at the time of faultRelay shall record 3600 cycles of waveform data for the currentRelay shall record the last 300 events into an event log with date and time stampingRelay shall have the following communications ports available if specified:Rear communications port(s) that support: IEC61850, Modbus TCP, and DNP3.0 TCP via RJ-45 connectorA USB front communication port for programing and interrogation of the relay via personal or laptop computerCommunication ports shall have the ability to transmit all information contained in the relay such as currents, set points, cause of trip, magnitude of trip current, and open-close trip status over the connected network. Relay trip contacts shall not change state if power is lost or an undervoltage occurs. These contacts shall only cause a trip upon detection of an overcurrent or fault condition based upon programmed settingsThe relay shall be suitable for operating on control power with a nominal input voltage of 24Vdc The Relay shall be fully programmable through the face of the relay. In addition, a means to be able to program the relay through a communication port needs to be provided.Meet the specified time-current curve immediately upon energization.No “warm-up”, initialization, or arming time delays adjustments shall be necessary.No minimum load requirement or battery back-up device shall be necessary to meet the specified time-current characteristics.VFI Optional Features[]VFI operating handle located on transformer tank sidewall in padlockable enclosure Comment by Note to Specwriter: Insert an X in the brackets next to desired VFI options[]Motor OperatorsWhen specified, a DC motor operator, with integral control shall be supplied for the S-VFI transformer. The unit shall include the appropriate VFI mechanism for use with motor operation and all standard motor operator mounting hardware. The motor operator shall utilize 24-Vdc motor actuators to open and close the respective VFI. The time required to open or close the VFI shall be approximately 2.5 seconds. The motor control shall be equipped with a 50 amp-hour sealed lead acid gel-cell battery to supply energy to activate the motor operator and control functions. Battery charge shall be maintained by a temperature/voltage regulated charger within the motor control that shall be capable of fully re-charging a low battery within 24 hours.The motor control shall utilize an integral 120-Vac potential transformer for control power supply. (If a user supplied power supply to the motor control has been specified, the unit shall be provided with all necessary wiring connections.)The motor control shall include the following features:Open, Close, and Stop pushbuttons shall be provided for operation of the motor actuator.Open and Closed indicating lights shall be provided to indicate status of the VFI. These status lights shall use auxiliary switch inputs from the source VFI to determine open or closed status.Opening and closing indicating lights shall be provided to verify that the motor actuator is in process of opening or closing a switch. A lamp test pushbutton shall be provided to confirm that indicating lights are functional.A Power On/Off toggle switch shall be provided that shall disconnect the dc voltage supply from the control and the motor actuator and shall function as a dc circuit breaker to interrupt the dc supply in the event of a short circuit or overload.An indicator light shall be provided to verify that 12Vdc battery is healthy and voltage is present and that the battery charging circuit is providing a charging voltage to the battery.A Local/Remote toggle switch shall be provided. In the Local position, the switch shall allow operation of the motor actuator by the pushbuttons on the control panel only and shall not allow remote or SCADA operation. In the Remote position, the switch shall only respond to the remote or SCADA operation of the motor actuator.[]Visible Disconnect WindowThe VFI mechanism will be mechanically interlocked with a 3ph ganged disconnect switch such that the VFI must be in the ‘open’ position to operate the disconnect. The contacts of the visible disconnect switch will be clearly visible through a 4” x 11” view window. When specified with motor operator: Visible disconnect switch must be interlocked with auxiliary contacts such that the motor cannot close the VFI mechanism when the visible disconnect is in the ‘open’ position.[]Open/Closed SemaphoresWhen specified, an Open (green) /Closed (red) mechanical semaphore shall be provided and shall indicate the open or closed status of the vacuum fault interrupter. The semaphore shall be visible through a window on the tank in direct logical proximity to the operating handle of its fault interrupter. Semaphore is provided as standard with motor operator kit.[]Kirk-Key Interlock ProvisionsWhen specified, mounting provisions for Kirk key interlocks shall be provided on each switched and VFI protected way. []Auxiliary SwitchesWhen specified, the VFI shall be provided with [one extra set] [two extra sets (non-motor op only)] of stage “a” and “b” auxiliary switches for the purpose of remote indication of status. These auxiliary switches shall be rated for 15-amps @ 120-Vac / 1-amp @ 125-Vdc and wired to an external terminal strip.Comment by Note to Specwriter: If checked Select one[]Partial Range Current Limiting Fuses in series with VFIWhen specified, the VFI shall be provided with separate partial range current limiting fuse. The VFI will be connected in series with the partial range current limiting fuse. The partial range current limiting fuse will provide protection up to 50 kA. LabelingA temporary bar code label shall be attached to the exterior of the transformer in accordance with IEEE Std C57.12.34™-2009 standard.Finish Performance RequirementsThe tank coating shall meet all requirements in IEEE Std C57.12.28™-2014 standard including:Salt SprayCrosshatch adhesionHumidityImpactOil resistanceUltraviolet accelerated weatheringAbrasion resistance – taber abraserThe enclosure integrity of the tank and cabinet shall meet the requirements for tamper resistance set forth in IEEE Std C57.12.28™-2014 standard including but not limited to the pry test, pull test, and wire probe test.Optional features to reduce exposure to arc flash[]Additional transformer rating nameplate – In addition to the standard nameplate located on the transformer tank, a second nameplate shall be included. The nameplate shall be mounted external to the termination compartments with an industrial grade double-sided adhesive. Its location shall be identified on the data sheet.Comment by Note to Specwriter: Insert an X in the brackets next to desired optional features to reduce arc flash exposure[]External drain valve with sampler – A 1.0” drain valve with sampling device shall be located outside of the cable compartment on the [low voltage] [high voltage] side of the tank. The valve shall be protected by a hinged cover with padlock provisions.Comment by Note to Specwriter: If checked, Select one[]External instrumentation package – All included gauges and instrumentation devices shall be located outside of the cable compartments such that access to them does not require exposure to any live circuits. They shall be located inside a separate NEMA® 4 rated enclosure on the [low voltage] [high voltage] side of the tank. Devices shall include the following: liquid level gauge, dial-type thermometer, pressure/vacuum gauge, pressure relief valve, ½” fluid sampling valve, [temperature transducer], [pressure transducer], [winding temperature indicator], [rapid rise relay], [upper fill plug/valve]. (Note; If supplied with integral VFI with external cabinet for the VFI operating handle, then gauges can be installed in the same cabinet)Comment by Note to Specwriter: If checked, Select oneComment by Note to Specwriter: If checked, select additional items as requiredComment by Note to Specwriter: Delete note before printing or copying

[]Alarm contacts shall be included on the [liquid level gauge] [dial-type thermometer] [ pressure/vacuum gauges]. Any of the accessories above with contacts shall be wired [to terminal blocks located within the enclosure] [via liquid-tight flexible conduit to a terminal block in a [NEMA® 4] [NEMA® 4X] control box located below the instrument box].Comment by Note to Specwriter: If checked, select items to include with alarm contactsComment by Note to Specwriter: If checked, Select terminal block location optionComment by Note to Specwriter: If checked, Select one[]External load break switch – The high voltage switch handle shall be located on the exterior tank wall on the high voltage side of the transformer. The switch shall be operable without exposure to any live circuits. The handle shall be protected by a hinged cover with padlock provisions.[]External visible load break (EVLB) switch – The high voltage switch shall be located on the exterior tank wall on the high voltage side of the transformer and shall include a viewing window that provides visible confirmation of the switch blade position. The switch shall be of a [2-position, on/off] [3-position, on/off/ground] configuration and shall be operable without exposure to any live circuits. Hinged covers with padlock provisions shall be provided over the window and over the switch handle. Properly sized current-limiting fuses shall be included in the transformer for additional safety.Note: The EVLB option is limited to the following ratings:

Line voltage (kV)

Maximum kVA

≥ 12.0 ≤ 34.5

3000

≥ 7.2 < 12.0

2000

≥ 4.16 < 7.2

1000

[]For additional safety and ease of maintenance, the following instrumentation devices shall be located on the front of the external load break switch compartment: liquid level gauge, dial-type thermometer, pressure/vacuum gauge, pressure relief valve and ½” fluid sampling valve. These devices shall be protected by a hinged cover with padlock provisions. If alarm contacts are required a second set of gauges shall be provided in the low voltage cable compartment with the contacts wired to a terminal block on the metal divider between the compartments.

[]Infrared (IR) inspection windows – To monitor connections in the high voltage and low voltage compartments without opening the compartment doors, IR window shall be provided. The window(s) shall be IRISS model VPFR-75 or approved equal. The quantity and location of the window(s) shall be indicated on the data sheets.The following standard accessories and options shall be provided:1.0” Upper Fill Plug with Filter Press Connection1.0” Drain/Sampling ValveBolted CoverLifting Lugs (4)Liquid Level GaugeDial Type ThermometerPressure/Vacuum GaugeAccessories []Welded main tank cover with bolted handhole (1500 kVA & above)Comment by Note to Specwriter: Insert x in the brackets next to all required accessories and options[]1.0” upper fill plug[]1.0” drain plug in LV compartment (500 kVA & below)[]1.0” drain valve w/ sampling device in LV compartment (750 kVA & above)[]Automatic pressure relief valve[]Metal drip shield (when bayonets specified)[]20” deep cabinet (2500 kVA & below)[]24” deep cabinet (3000 kVA & above)[]Ground provisions per IEEE Std C57.12.34™-2009 standard section 9.11.[]Meet NEMA® TR-1 sound levels[]1.0” drain valve w/ sampling device in (LV or HV) compartment (500 kVA & below)[]Upper fill valve[]Pressure vacuum bleeder[]24” deep cabinet []30” deep cabinet[]36” deep cabinet[]40” deep cabinet[]Spare bayonet fuse links[]Fault indicator provisions[]Ground connectors[]Mr. Ouch warning & danger signs[]Danger high voltage warning signs[]Miscellaneous stenciling[]Non-PCB decal[]Touch-up paint[]Interphase barriers (for live front primary units only)[]Seismic zone 3 and 4 tank anchoring[]Complete 304L stainless steel tank and cabinet []304L stainless steel tank base and cabinet sides & sill (partial)[]Liquid level gauge with auxiliary contacts[]Dial-type thermometer gauge with auxiliary contacts[]Pressure vacuum gauge with auxiliary contacts[]Current or potential transformers[]Rapid rise relay with seal-in panel[]Winding temperature indicator[]Watt-hour meter package – includes GE kV2c Encompass™ Electronic Meter. Factory supplied wiring shall be internal to the cabinet, not in conduit. Communication connection shall be the OPTOCOM port.[]Harmonic resistant K-factor design, K= [4] [9] [13] [20]Comment by Note to Specwriter: If checked, select one[]Forced air ONAF (mineral oil) or KNAF (Envirotemp™ FR3™ fluid) rating. Forced air rating requires documentation from Eaton’s customer that they are aware this transformer is no longer tamper resistant and is no longer in compliance with ANSI® standards.[]Future forced air rating []Forced Air Fan Control Package []FM Global® (FM) Approved transformer (to comply with NEC® 450-23 listing restrictions for installations on, near, or inside of buildings)[]Combination UL® Listed & Classified transformer (to comply with NEC® 450-23 listing restrictions for installations on, near, or inside of buildings) per UL XPLH[]UL® Listed transformer (certifying compliance with ANSI® standards only) per UL® XPLH[]External visible break with gauges: Gauges include liquid level, dial-type thermometer gauge, pressure/vacuum, pressure relief valve, and a 1.0” oil sampler valve, and fill plug.Optional Transformer Evaluation[]No unit evaluation but include quote losses as reference only on bid.Comment by Note to Specwriter: Select losses only or loss evaluation to be performed[]Unit loss evaluation guaranteed average losses. Criteria to properly evaluate quoted losses:Core loss evaluation (A-factor) ____ $/wattComment by Note to Specwriter: If selected, Enter A factorWinding loss evaluation (B-factor) ____ $/watComment by Note to Specwriter: If selected, Enter B factorExecutionProduction TestingAll units shall be tested for the following:No-Load (85 °C or 20 °C) losses at rated currentTotal (85 °C) losses at rated currentPercent Impedance (85 °C) at rated currentExcitation current (100% voltage) testWinding resistance measurement testsRatio tests using all tap settingsPolarity and phase relation testsInduced potential testsFull wave and reduced wave impulse testTransformers shall conform to efficiency levels for liquid immersed distribution transformers, as specified in the Department of Energy ruling “10 CFR Part 431 Energy Conservation Program: Energy Conservation Standards for Distribution Transformers; Final Rule; April 18, 2013.” Manufacturer shall comply with the intent of all regulations set forth in noted ruling. In addition, the manufacturer shall provide certification upon request for all design and other tests listed in IEEE Std C57.12.00™-2010 standard, including verification that the design has passed short circuit criteria per IEEE Std C57.12.00™-2010 standard and IEEE Std C57.12.90™-2010 standard.In the event of proposal bid evaluated with guaranteed losses due to a loss evaluation (see section 10.0), manufacturer shall conform to guaranteed average losses as specified in IEEE Std C57.12.00™-2010 standard. The no-load losses of a transformer shall not exceed the specified no-load losses by more than 10%, and the total losses of a transformer shall not exceed the specified total losses by more than 6%.ShippingTransformers, 1000 kVA and below, shall be palletized. Transformers, 1500 kVA and larger, shall be loaded and unloaded with overhead cranes, so a pallet is not to be provided for these transformers.Data with ProposalThe following data shall be submitted with the proposal:Core losses Winding losses Percent Impedance Typical bid drawingApproval drawing – drawings shall show final dimensions and features. When requested, approval drawings shall be provided per quoted leadtime. Record Drawing – drawings shall show final dimensions and features. When requested, record drawings shall be provided.ServiceThe manufacturer of the transformer shall have regional service centers located within two (2) hours flight time of all contiguous 48 states. Service personnel shall be factory trained in commissioning and routine service of quoted transformers.

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