1412175446 Appendix A - Technical Specifications.pdf

JEA

SJRPP Unit 3 Combined Cycle

Unit Auxiliary Transformers

424014.63.3802

Request for Proposal Issue

15 May 2026

Black & Veatch

Overland Park, KS

Proprietary and Confidential All information contained herein is not for use or disclosure outside the Black & Veatch family of companies, including all subsidiaries and affiliates, except under written agreement by the contracting parties.

Table of Contents

01100 - Technical Scope and Performance Requirements

01100.1 Technical Scope of Work

01100.1.2 Technical Submittals

01100.2 Technical Attachments

01100.2.1 Engineer’s Attachments

16151 – Power Transformers Datasheet 19000 - Quality System Requirements

19000.1 General Quality System Requirements

19000.1.1 Quality System

19000.1.2 Subtier Suppliers

19000.1.3 Inspection and Test Plan

19000.1.4 Inspections by Purchaser

19000.1.5 Code and Non-Code Inspection

21000 - Technical Supplemental Specifications

21000.1 Summary of Applicable Supplementals

21000.2 Technical Supplemental Specifications

D100 Site Meteorological and Seismic Data (Revised by Project: 09Sep25) Q170 Welding of Electrical Equipment (Revised by Project: N/A)

Q170.1 General Q170.2 Welding Processes Q170.3 Filler Materials Q170.4 Joint Design Requirements Q170.5 Welding Procedure Requirements Q170.6 Welder/Welding Operator Performance Qualification Q170.7 Fabrication Controls Q170.8 Nondestructive Examination (NDE)

Q301 Manufacturer's Standard Coating (Revised by Project: 7-Jan-2026) Q301.1 Control and Electrical Equipment Q301.2 Mechanical Equipment Q301.3 Documentation

Q500 Shop Drawings and Instruction Manuals (Revised by Project: 09Sep25) Q500.1 Submittal Requirements Q500.2 Compliance Reports Q500.3 Motor and Electric Actuator Information Q500.4 Drawings Q500.5 Wiring Diagrams Q500.6 Instruction Manuals Q500.7 Manufacturer’s Data Report Requirements Q500.8 Binding

Q501 Instruction Manuals (Revised by Project: 07Apr26) Q501.1 Submittal Requirements Q501.2 Instruction Manuals

Q502 Electrical Data (Revised by Project: 09Sep25) Q502.1 Submittal Requirements Q502.2 Motor and Electric Actuator Information Q502.3 Wiring Diagrams

Q520 OEM 3D Equipment Model Development (Revised by Project: 09Sep25) Q520.1 Submittal Requirements Q520.2 Model Development Q520.3 Piping System Requirements Q520.4 Model Data Q520.5 Out of Scope Content Q520.6 Model Submittal Q520.7 JEA’s Review

Q520.8 Tekla Structures Model(s) (Structural Steel Detailing Models) S100 Seismic Design (Revised by Project: 16Feb26)

S100.1 General S100.2 Seismic Forces S100.3 Seismic Design and Certifications S100.4 Documentation

S400 Contractor Loads for Structures, Equipment, and Components (Revised by Project: N/A) S400.1 General S400.2 Required Contractor Loads S400.3 Load Table Requirements

V100 Noise Abatement (Revised by Project: 09Apr26)

JEA SJRPP Unit 3 Combined Cycle

RFP Issue

424014.63.3802 15May2026

Source: 01100, 2024, v2.7 Technical Scope and Performance Requirements Page 1 of 81

01100 - Technical Scope and Performance Requirements

01100.1 Technical Scope of Work

The work under these specifications shall include furnishing the following:

1. Unit Auxiliary Transformers (quantity and site location note below)

2. Oil for all transformers

3. Delivery DDP transformer to jobsite

All Work shall be produced in accordance with the current laws, ordinances, regulations, codes, standards, and rules applicable to Professional Engineers practicing in the state of Florida. If required by the applicable current laws, ordinances, regulations, codes, standards and rules; the Supplier design documents (calculations, drawings, specifications, statements of special inspections, certificates of compliance, etc.) shall be certified and sealed by an engineer licensed to practice in the state of Florida and shall be submitted to JEA.

In the event of technical conflicts, errors, or discrepancies, the detailed technical specifications, including this Section 01100 and all higher numbered sections, take precedence over Section 21000, Technical Supplemental Specifications.

Major Equipment Scope

Item Description Site Tag Number(s) Quantity

1. Unit 3- Unit Auxiliary Transformer A

SJRPP 3APE-XF-1000

2. Unit 3- Unit Auxiliary Transformer B

SJRPP 3APE-XF-1001

3. Unit 4-Unit Auxiliary Transformer A

SJRPP 4APE-XF-1000

4. Unit 4- Unit Auxiliary Transformer B

SJRPP 4APE-XF-1001

Miscellaneous Materials Scope

Item Description Supplier (applies to)

Purchaser (applies to)

1. All nuts, bolts, gaskets, special fasteners, backing rings, and other accessories required for installation of components and furnished equipment.

All technical sections

2. All piping integral equipment and skids. All technical

3. All coupling guards, belt guards, and personnel safety items required for furnished equipment.

4. All connections on furnished equipment for interfacing to Purchaser-furnished piping and instruments.

Source: 01100, 2024, v2.7 Technical Scope and Performance Requirements Page 2 of 81

Miscellaneous Materials Scope

Supplier (applies to)

Purchaser (applies to)

5. All valves and instruments required for automatic control and monitoring of the furnished system (or for manual control and monitoring of the system).

6. All instrument, power, and control wiring and RGS conduit integral to equipment, skids, or packages furnished. Junction boxes shall be furnished with terminal blocks and internal wiring to these terminal blocks for equipment requiring external connection.

7. Electrical and control wiring to connect furnished equipment terminal points to the plant electrical and control systems.

All technical sections

8. Motor controls and starters for furnished equipment (integral to transformer control panel).

9. Ground pads and lugs for furnished equipment, skids and structures (NEMA two-hole pad on all four corners).

10. Start-up commissioning spare parts. All technical

11. One set of consumable materials required for startup and testing (if required).

12. Touchup paint for field All technical

13. Permanent foundations/tie-down pads and foundation

All technical sections

14. All other features as specified in this procurement package.

Miscellaneous Engineering/Services Scope

Supplier (applies to)

Purchaser (applies to)

1. Design, fabrication, Factory Acceptance Testing, packaging, and delivery of all equipment.

2. Shop drawing submittals. All technical

3. Provide site-specific foundation load tables D100, S100, S400

4. Shop testing including Purchaser Witness of transformer testing

5. Shop material inspection and testing. All technical

Source: 01100, 2024, v2.7 Technical Scope and Performance Requirements Page 3 of 81

Miscellaneous Engineering/Services Scope

Supplier (applies to)

Purchaser (applies to)

6. Calibration of all instrumentation and relay furnished as part of Supplier equipment.

7. Field technical advisor service time (rates for time and travel).

8. Receiving, unloading, storing, and field erection of all equipment including oil dry and filling.

All technical sections

9. Transformer field testing All technical

01100.1.2 Technical Submittals

This article identifies all of the Technical Submittals that are required to be submitted to JEA by the Supplier. Included is the schedule basis for each submittal to support the overall engineering cycle for this project.

Item No.

Submittal Item

Submittal Dates

Calendar Days

Event Due Date LD’s Apply

1 Advance Shipping Notice including Final Detailed Packing List

2 Before Delivery of Equipment

No

2 Shipment Origin and Profile Reports for All Shipments of Work

90 Before Initial Shipment with

Monthly Updates

No

3 Engineering/Procurement/Production/ Testing and Inspection/Shipping Schedule and Status Report

30 After Effective Date with Monthly

Updates

Yes

4 Preshipment Inspection Notice 30 Before Shipment of Equipment

No

5 Electronic Material List 30 After Effective Date with Monthly

Updates

Yes

6 Preventative Maintenance and Jobsite Handling and Storage Requirements, if Applicable

With Electronic Material List

Yes

7 Safety Data Sheet (SDS) Forms With Each Shipment No

8 Completed Spare Parts List (SPIR) and/or Recommended Spare Parts List, with Unit Prices and Names of Suppliers, Necessary to Cover a Full Operations Maintenance for a 3 year Cycle

90 After Effective Date No

9 Inspection and test plan including references to applicable standards and method of inspecting subtier suppliers

90 Before Start of Fabrication

Yes

Source: 01100, 2024, v2.7 Technical Scope and Performance Requirements Page 4 of 81

Submittal Item

Submittal Dates

Calendar Days

Event Due Date LD’s Apply

10 Inspection and test report for each inspection on the inspection and test plan

21 After Test of Inspection

No

Power Transformers - Unit Auxiliary

11 Certification Letter or Certificate of Authorization (copy), if certified by a registered agency, e.g., ASME Certificate of Authorization, ISO Certificate

30 After Effective Date No

12 Subsupplier listing 5 Before Issue of Subsupplier Purchase

Order

No

13 Notification of inspection/test (for JEA hold/witness points)

14 Before Test/Inspection No

14 Quality Manual, uncontrolled copy 28 After Effective Date No

15 Leak Test Procedure 90 After Effective Date No

16 Factory Acceptance Test Procedure 90 Before Test Yes

17 Outline Drawing Containing the Following Information Required for Transformer Foundation Design (Not to Exceed Information as a Minimum):

• Weights (Shipping & Oil Filled).

• Oil Volume.

• Dimensions of Rad/COPS Tanks for Oil Containment Design.

• Overall Transformer Dimensions Including all Auxiliary Equipment, Base Dimensions and Top of Oil Tank.

• Clearance Requirements from Buildings or Fire Walls.

• Horizontal & Vertical Location of Center of Gravity.

30 After Effective Date Yes

18 Detailed Outline Drawing, including the following:

• Location of Major Auxiliary Equipment.

• List of transformer items, including the vendor’s name, model number and quantity.

• Iso-Phase Flange Details.

• Certified Data for Items listed in Item 510.

60 After Effective Date Yes

19 Bushing & Arrester Outline Drawings 60 After Effective Date Yes

Source: 01100, 2024, v2.7 Technical Scope and Performance Requirements Page 5 of 81

Submittal Item

Submittal Dates

Calendar Days

Event Due Date LD’s Apply

20 Wiring Diagrams & Elementary Diagrams

60 After Effective Date Yes

21 Nameplate Drawings 60 After Effective Date No

22 Recommended Erection Sequence in Detail

90 Before Shipment of Equipment

Yes

23 Transformer Design Review Input Data

75 After Effective Date No

24 Short-Circuit Withstand Type Data or certificate of successfully passed short circuit test

With Proposal (if requested)

No

25 Design Data & Transformer Performance Curves Including:

- No Load Overexcitation Capability(%

vs. time): No Load Overexcitation Capability shall be furnished as a curve: V/HZ capability as a function of time. There shall be a short-time capability curve with a time scale from 0 to 120 minutes. There shall be a long-time capability curve with a time scale from 2 hours to 30 hours.

No Load Overexcitation Capability shall be furnished in a numeric format.

The time shall extend from 0 to 120 minutes with a one minute resolution.

- Full Load Overexcitation Capability(% vs. time): Full Load Overexcitation Capability shall be furnished as a curve: V/HZ capability as a function of time. There shall be a short-time capability curve with a time scale from 0 to 120 minutes. There shall be a long-time capability curve with a time scale from 2 hours to 30 hours.

Full Load Overexcitation Capability shall be furnished in a numeric format.

The time shall extend from 0 to 120 minutes with a one minute resolution.

- MVA Capability vs. Average Ambient Temperature

- I²t Damage Curves

75 After Effective Date Yes

26 Auxiliary Power requirements 60 After Effective Date Yes

27 Current transformer ratio correction factor and excitation curve with internal resistance (at stated temperature reference) of the CT stated on the secondary excitation characteristic curve.

90 After Effective Date Yes

Source: 01100, 2024, v2.7 Technical Scope and Performance Requirements Page 6 of 81

Submittal Item

Submittal Dates

Calendar Days

Event Due Date LD’s Apply

28 Current transformer ANSI relaying and metering accuracy; thermal rating;

secondary resistance at 75° C; phase angle correction factor curves

Welding of Electrical Equipment

29 Welding Procedure Specifications (WPS) with applicable Procedure Qualification Records (PQR) (when required by Q170)

60 Before Start of Fabrication

No

Manufacturer's Standard Coating .

30 Shop drawings that identify shop-applied coating systems

30 Before Start of Fabrication

No

31 Manufacturer's product data sheets, to include DFT per coat, number of coats and total coating system DFT

30 After Release to Proceed

No

Shop Drawings and Instruction Manuals

32 Completed Instruction Manuals (for instruction manual submittal requirements, refer to Technical Supplemental Q501 and the commercial submittals section.)

Upon Shipment of Equipment

Yes

Electrical Data

33 Completed motor information sheets 60 After Effective Date Yes

34 Completed electric actuator information sheet

01100.2 Technical Attachments

This article lists the drawings and other technical attachments that have been prepared for the work under these specifications.

01100.2.1 Engineer’s Attachments

None

Source: 16151, 2023, 1.8 Power Transformers Page 7 of 81

16151 – Power Transformers Datasheet

Specific Ratings

1 Scope of Supply for UAT connected to CTG IPB (“A/B” Transformers)

2 SJRPP Unit 3 - Unit Auxiliary Transformer A

SJPRP Unit 3 - Unit Auxiliary Transformer B

3 Rating

Winding

MVA

Ratings at 65° C

Nominal System Voltage

(kV)

Winding Rated

Voltage (kV)

Highest Equip-ment

Voltage (kV)

Line

BIL

(kV)

Neutral BIL (kV)

Connection

5 High Voltage; HV

20/26.7/33.3 25 24 26 150 N/A Delta

6 Low Voltage; XV

20/26.7/33.3 8.7 6.9 6.9 110 110 Res Grd

Wye

7 Frequency, Hz 60 Application Outdoor

8 Number of Phases

Transformer Type Step Down 2 Windings

Cooling Class ONAN/ONAF/ONAF

Winding Material 100% Copper

10 Vector Group LV lags HV by 30 deg (Dyn1)

Altitude for Design

Below 3300 ft (1000 m)

11 Ambient Temperature Range of Design

30 ⁰C Daily Average / 40 ⁰C Max. for Any 24 Hour Period, -20 ⁰C Min.

12 Temperature Rise (Winding average) 65 Temperature Rise (Top oil) 65

Max. Winding Hot Spot Rise 80

14 Oil Preservation System Inert Gas Pressure System

15 Seismic Ground Acceleration Level See D100/S100

16 Audible Sound at Max. MVA (dBA) 71 / 74 dB at ONAN/ONAF (0.3m / 2m)

17 Impedances (at rated voltage, 85 ° C Reference Temperature and 20 MVA Base)

18 Windings Impedance (%) Tolerance (%)

19 H-X 18 ±7.5%

20 Tap Changers

Regulated Windings

Type Tap

Changer Control

Number of Steps Total % Above

Rated kV

Total % Below

Rated kV Plus Minus

HV

De- Energized

Local Manual

2 2 5 5

23 Bushings

BIL (kV)

Termination Compartment

Min Current Rating [A] Termination Type Location Segment**

Source: 16151, 2023, 1.8 Power Transformers Page 8 of 81

HV 200 Yes

Isolated Phase Bus** Cover 3

XV 150 Yes 3300 Cable Bus Wall 1

X0 110 No

Conductor to Bushing Cover 1

28 The Physical Arrangement and Terminal Identification Shall

Be X1-X2-X3 from Left to Right When Facing the Low

Voltage Side, H1-H2-H3 and from Right to Left When Facing HV Side.

** IPB to be provided by IPB supplier.

29 Neutral Grounding Equipment

30 Connection Point

Method Ohms Amperes kV Time

Duration Mounted on

Transformer?

X0 Resistance 8 500 6.9 seconds

Yes

32 Current Transformers

33 Location Point Bushings

Ratio Primary:

Secondary

Accuracy Class

Burden Position on Bushing

Qty per Bushing

Total

34 HV

1200:5A MR

(IEEE)

C800 B-8.0 Relaying

(IEEE)

Lower 2 6

35 HV

2000:5A MR

(IEEE)

0.3 Metering

(IEEE)

B-1.8 Metering

(IEEE)

Upper 1 3

36 XV

3000:5A MR

(IEEE)

C800 B-8.0 Relaying

(IEEE)

Middle 1 3

37 X0

500:5A SR

(IEEE)

C400 B-4.0 Relaying

(IEEE)

Middle 1 1

38 Scope of Supply for UAT connected to STG IPB (Train “B” Transformers)

39 SJRPP Unit 4- Unit Auxiliary Transformer A

SJPRP Unit 4- Unit Auxiliary Transformer B

40 Rating

Winding MVA Ratings at 65° C

Nominal System Voltage

(kV)

Winding Rated

Voltage (kV)

Highest Equip-ment

Voltage (kV)

Line

BIL

(kV)

Neutral BIL (kV)

Connection

42 High Voltage; HV

20/26.7/33.3 25 18 26 150 N/A Delta

43 Low Voltage; XV

20/26.7/33.3 8.7 6.9 6.9 110 110 Res Grd Wye

44 Frequency, Hz 60 Application Outdoor

45 Number of Phases

Transformer Type

Step Down 2 Windings

46 Cooling Class ONAN/ONAF/ONAF Winding Material 100% Copper

Source: 16151, 2023, 1.8 Power Transformers Page 9 of 81

Vector Group

LV lags HV by 30 deg (Dyn1)

Altitude for Design

Below 3300 ft (1000 m)

48 Ambient Temperature Range of Design

30 ⁰C Daily Average / 40 ⁰C Max. for Any 24 Hour Period, -20 ⁰C Min.

49 Temperature Rise (Winding average) 65 Temperature Rise (Top oil) 65

Max. Winding Hot Spot Rise 80

51 Oil Preservation System Inert Gas Pressure System

52 Seismic Ground Acceleration Level See D100/S100

53 Audible Sound at Max. MVA (dBA) 71 / 74 dB at ONAN/ONAF (0.3m / 2m)

54 Impedances (at rated voltage, 85 ° C Reference Temperature and 20 MVA Base)

55 Windings Impedance (%) Tolerance (%)

56 H-X 18 ±7.5%

57 Tap Changers

Regulated Windings

Type Tap

Changer Control

Number of Steps Total % Above

Rated kV

Total % Below

Rated kV Plus Minus

HV

De- Energized

Local Manual

2 2 5 5

60 Bushings

BIL (kV)

Termination Compartment

Min Current Rating [A] Termination Type Location Segment**

HV 200 Yes

1200 Isolated Phase Bus** Cover 3

XV 150 Yes

Cable Bus Wall 1

X0 110 No

3300 Conductor to Bushing Cover 1

65 The Physical Arrangement and Terminal Identification Shall

Be X1-X2-X3 from Left to Right When Facing the Low

Voltage Side, H1-H2-H3 and from Right to Left When Facing HV Side.

** IPB to be provided by IPB supplier.

66 Neutral Grounding Equipment

67 Connection Point

Method Ohms Amperes kV Time

Duration Mounted on

Transformer?

X0 Resistance 8 500 6.9 seconds

Yes

69 Current Transformers

70 Location Point Bushings

Ratio Primary:

Secondary

Accuracy Class

Burden Position on Bushing

Qty per Bushing

Total

Source: 16151, 2023, 1.8 Power Transformers Page 10 of 81

71 HV

1200:5A MR

(IEEE)

C800 B-8.0 Relaying

(IEEE)

Lower 2 6

72 HV

2000:5A MR

(IEEE)

0.3 Metering

(IEEE)

B-1.8 Metering

(IEEE)

Upper 1 3

73 XV

3000:5A MR

(IEEE)

C800 B-8.0 Relaying

(IEEE)

Middle 1 3

74 X0

500:5A SR

(IEEE)

C400 B-4.0 Relaying

(IEEE)

Middle 1 1

General Requirements: The Following Requirements are Applicable to All Transformers

75 Items Furnished by others and Interfaces

76 Refer to 01100 section.

77 Applicable Codes and Standards

78 Work In Accordance With

79 Transformer (applicable versions of the following):

IEEE C57 Series and all reference documents (Latest Revision)

80 Materials

81 The following materials shall be used:

82 Component Material

83 Core High Grade Domain Refined CGRO steel

84 Approved Manufacturers of Components

85 Component Material

86 Core Steel AK Steel TRANCOR, JFE, POSCO

87 Insulation WEIDMANN

88 Copper CTC from Sam Dong, MW from SamDong, ESSEX, REA

89 Press Rings Rochling

90 Radiators TTP

91 CT Meramec

92 Fans Krenz

93 Bushings HITACHI ABB, PCORE

94 Paint System and Colors Power

Supplies Nominal Voltage

No. of Sources

Available Fault Current

95 Tank and Accessories Color

ANSI #70

Light Gray

Auxiliary Power

480V Three Phase, 3-wire

2 65 kA

96 Painting System Mfr Std Control

DC

125V, 2-wire 1 10 kA

Porcelain Color

Mfr Std

Control

AC

120V Single Phase, Derived by Supplier from the

480V supplied

As Required

Source: 16151, 2023, 1.8 Power Transformers Page 11 of 81

98 Convenience Outlet Yes

99 Loss Evaluation (at rated voltage) US$/kW

100 No Load Losses (20° C Reference Temperature) 5000

101 Load Losses at Maximum MVA Rating (85° C Reference Temp.)

102 Auxiliary Cooling Losses at Maximum MVA Rating 1600

103 Accessories

104 Resistance Temperature Detector

(RTD)

Hot Oil and Hot Spot – PT100

Dissolved Gas Detector

Provisions may be made for future installation of an online dissolved gas monitoring system.

Buchholz Relay

Yes – Double Float Type, Alarm and Trip Contacts

Pressure Relief Device (PRD)

Yes – Mechanical Type, Vendor Neutral

108 Winding temperature

Yes – Dial Type Indicator with Alarm Contacts

109 Oil level

Yes – Magnetic Oil Level Gauge (MOG) with Alarm

Contacts

110 Oil temperature

Yes – Dial Type Indicator with Alarm Contacts

111 Fan failure alarm Yes

112 Power supply failure alarm Yes

113 Annunciator Panel No

114 Ancillary Equipment Locations

115 Equipment Segment

116 Control Cabinet 4

117 Neutral Grounding Resistor 2,4

118 Temperature Indicators 4

119 Oil Level Indicators 4

Source: 16151, 2023, 1.8 Power Transformers Page 12 of 81

120 Ground Pads 1, 2, 3 and 4

121 Additional Requirements

122 1. Core Flux Density at 110% Rated Voltage (Web/M2 or Tesla)

Not to exceed 1.925 T

123 2. Winding Conductor Current Density (Amp/mm2)

Not to exceed 4.0 A/mm2 (Only unloaded Tertiary and Regulating windings can have up to 4.5 A/mm2)

124 3. Current transformer leads shall be extended into the control cabinet and shall be terminated on shorting type terminal blocks with preinsulated ring type connectors.

Testing

125 Test Requirements

126 Tests In Accordance With (latest applicable version)

Conducted By

127 Factory testing IEEE C57

(Latest Revision)

Supplier

128 Field Testing IEEE C57

(Latest Revision)

Supplier or Supplier’s Subcontractor

129 Technical Attachments

130 Technical attachments relevant to the work under this section are listed in Section 01100.

131 Supplemental Specifications

132 Technical supplemental specifications that are applicable to the work covered under this technical specification section are identified and included in Section 21000.

Products

133 General

134 This specification is intended for procurement of outdoor oil-immersed power transformers.

The Supplier shall provide a standard design for items within the scope of this specification, but which are not covered in detail by these specifications.

135 The standard design shall be in accordance with accepted industry practices for electrical power generation.

136 Transformer shall be suitable for both step-up and step-down operation and the source of power to be assumed from HV, LV or tertiary windings (if existed).

137 Loading and Rating

138 The current carrying capability shall be limited only by the capacity of the core and coils and not by other components such as winding leads, bushings, and tap changers.

139 The vendor shall verify, by computer simulations, that above temperatures are not exceeded at any time during this overload condition. Calculations shall be provided to verify that neither top oil nor the hot spot conductor temperatures specified above are exceeded during the overload condition described.

140 Generation Step-Up Application

141 The transformer should be designed for application of generating step-up and follow relevant standard (IEEE C57.116 ).

Source: 16151, 2023, 1.8 Power Transformers Page 13 of 81

142 Generator step-up and unit auxiliary transformers will be directly connected to the generator in such a way that they may be subjected to load rejection conditions that result in an abnormally high voltage from the generator.

143 Therefore, these transformers shall be designed to withstand, as a minimum, the resulting stresses with 1.4 times the rated voltage for 5 seconds, applied at the transformer terminals to which the generator is to be connected.

144 Through-Fault Withstand

145 Transformers furnished under these specifications shall be capable of withstanding, without damage, the mechanical and thermal stresses caused by short-circuit currents limited only by the impedance of the transformer.

146 System impedance shall be considered equal to zero.

147 System pre-fault voltage shall be equal to the voltage rating of the maximum tap or 1.05 times the principal tap, whichever is greater.

148 Generator step-up and unit auxiliary transformers shall also be designed to withstand the resulting forces caused by a surge in terminal voltage and fault current contribution from the generator while coasting to a standstill.

149 Unless additional information is specified about the time/current/voltage characteristics of the generator under fault conditions, the following criteria shall be considered the minimum acceptable to account for these factors:

150 Type of Generator

Type of Transformer

Voltage Overshoot (times rated voltage)

Time Duration of Fault (seconds)

151 Combustion turbine

Unit auxiliary 1.25 2

152 If requested by Purchaser, conformance to these requirements shall be demonstrated by certified short-circuit test data on a transformer with similar core and coil design.

153 Mechanical Construction

154 Tanks, bases, radiators, covers, junction boxes, and any other attached compartments fabricated from steel shall withstand normal transportation, installation, and service stresses without distortion or damage.

155 Tank shall have welded construction. Corner welds are not accepted, and the welds shall be at least 6 inches from the corners. Cover shall be welded and verified to resist any deflection under full vacuum condition.

No sound mitigation is allowed to be installed inside the tank unless it is approved by JEA.

156 Fall arrester plates shall be mounted on the tank cover as close as possible to the center of the cover.

157 If a winding has multiple voltage levels, using a link-board is not acceptable. A properly selected switch shall be used to change the voltage.

158 Two manholes of minimum 22 inch-diameter with handles shall be provided on the tank cover to easy access the bushings, CTs and leads inside the tank. Manholes cover shall be bolted to the tank by a raised flange.

159 The complete tank shall be designed to withstand:

full vacuum and at least 125 percent of the maxium operating pressure of the oil preservation system furnished

160 The tank cover shall be sloped or domed to shed water and to assist with the flow of gas bubbles to the gas detector piping and/or relay.

Source: 16151, 2023, 1.8 Power Transformers Page 14 of 81

161 Field installation shall not require any welding. The base shall allow skidding or moving on rollers in any direction.

162 Lifting lugs and jacking pads shall be provided for lifting and jacking the completely assembled transformer. The jacking pads must be located near each of the four corners.

163 The tank shall be designed so that all current transformers can be removed easily without removing the main transformer tank cover.

164 Holes with automatic drain valves shall be provided at the low point of the bus duct flange enclosures so that condensate and water will not accumulate.

165 The transformer tank base shall be engraved, or a placard shall be installed to clearly identify the dimensional centerline near the base of the tank on all four sides. If abbreviated, “C.L” shall be used to signify dimensional centerline.

166 The tank shall be marked on a minimum of two adjacent sides to show center of gravity. If abbreviated, “C.G.” shall be used to signify center of gravity.

167 Drawings, nameplates, test reports, and correspondence must use the English language and English units of measure with the metric equivalent in parentheses. The following minimum information must be shown on the transformer outline drawing:

• All multiple quantities

• Weights and oil volumes

• Paint color

• Footprint of base

• Dimensional centerline. Location of Purchaser connections (bus duct, etc.)

shall be referenced to centerline on all outline drawings.

• Center of gravity (shown on two views)

• Valve sizes and types

• 77° F (25º C) oil level and low oil level

• Location and detail sketch of ground pads

• Location, cutout size, and open door dimensions of all cabinets

• Bushing and arrester ratings, stud dimensions with thread information, and space arrangements with hole patterns

• Location, hole sizes, and detail sketch of jacking, lifting, and pulling facilities.

A statement should be made describing which lugs are for lifting the transformer when completely assembled and full of oil

• Distance clearances around the envelope of the transformer that JEA must meet so as not to interfere with operation or maintenance of the transformer and its accessories. Some examples are cooling control cabinet swing door distance, pullout of radiator banks maintenance distances, etc.

• List of items including vendor name, quantity, and model number of the equipment where applicable

• All four sides and top view, as well as ISO view of the transformer.

Source: 16151, 2023, 1.8 Power Transformers Page 15 of 81

168 Core and Coils

169 The transformer shall be Core-Type, shell-type construction is not acceptable. The core shall have high quality CRGO steel sheets, with step-lap mitered joint construction that is burr-free (less than 0.6 mils).

The core highest temperature (hottest spot) shall not exceed 130° C at 30° C ambient temperature at any loading conditions or over-excitations.

170 Core through bolts of any materials (metal, fiberglass etc.) is not acceptable. Nuts, bolts, and clamps of the core assembly shall be provided with positive locking devices to prevent loosening. For core form transformers, the complete core and coil assembly shall be removable from the tank for repairs. Torque verification documents for all factory torqued connections shall be available for review by Purchaser.

171 The core shall be securely grounded to the tank. For core form transformers, the core ground connection shall be detachable and made in an externally located terminal box, accessible without requiring entry into the main tank.

If the design includes a Series Transformer (Booster Transformer) or Preventive Autotransformer (PA), a separate core ground shall be brought out for each one.

172 The outermost core steel packets and tie bars/plates (if located internal to the windings) shall be divided as needed so that the maximum operating temperature does not exceed the Supplier's standard practice. This is an item that will be verified in design review meeting.

173 Flitch plates shall be designed to withstand the stresses not to exceed 60% of the material elastic limit. The stresses shall be considered as the maximum of short circuit stresses and the lifting stresses.

174 In no case shall tie bar sections be wider than 3 inches (75 mm) or core packet sections wider than 4-1/2 inches (115 mm).

175 For units large enough to require slit core packets and/or tie bars/plates as described above, and having tie bars/plates located adjacent to the core packet, and also between core clamps and the core limbs, insulation material provided between the bars/plates and the core packets as well as core cooling duct insulation shall be a high temperature, non-cellulosic material such as Nomex.

176 Windings shall be fixed under pressure with single piece clamping plate, located at the top and bottom of each set of windings (multiple piece end rings are not acceptable). End ring deflection for top and bottom press rings shall be limited to 2.5 mm.

177 These clamping plates shall be properly sized and braced for short circuit forces, made from suitable materials, and locked into place with suitable means.

178 Core and windings for the main unit, as well as the series transformers and preventive autotransformers shall be circular and power class. All windings shall be copper. When a continuously transposed conductor is used, it shall be epoxy bonded. Netting tape CTCs are acceptable for use in Helical design only.

179 Main unit’s windings shall be Disc-type or Helical. Foil-wound (sheet-wound), layer windings or pancake windings are not acceptable. The only exception is foil wound Preventive Autotransformers (PA) for transformers rated less than 60MVA top rating.

Regulating windings shall have a fully distributed construction. Exception is Tapped Helix RV windings that have the same magnetic center for all taps. Type of windings must be given in the bid proposal document.

180 T Internal arresters or non-linear devices to limit the dielectric stresses are not allowed, unless it is approved by Purchaser.

Using a reactor to control the short circuit forces is not preferred, and it should be approved by

JEA.

Source: 16151, 2023, 1.8 Power Transformers Page 16 of 81

181 All windings shall be self-supporting for inward (buckling) and outward (hoop) forces.

Windings shall not rely on the core assembly for support to resist inward radial short-circuit forces.

182 Winding capability to resist inward radial forces shall be based on the ability of the conductor to resist forces in a "free-buckling" mode, which shall be less than 0.65 of the conductor’s RP0.2 (2 percent yield strength).

Tensile stresses in all windings shall be limited to 80% of 0.2% yield strength of the conductor material.

183 Stress in oil ducts shall not exceed 80% of Weidmann PD-inception curves for degassed oil.

The DIL factor used for impulse waves shall be considered not greater than 2.5.

New concept design for this transformer is not accepted unless it is approved by Purchaser, that means the Manufacturer shall have an experience in the design concept and successfully passed testing of this transformer.

184 Windings of 115kV and above shall be designed for basic switching impulse insulation levels (BSL) according to the IEEE C57.12.00 - Table 5 standard.

185 When the coils use paper insulation, it shall be thermally upgraded paper insulation. Proof of paper quality, testing and specifications shall be furnished upon request and shall be subject to acceptance/approval by JEA.

The conductor insulation papers shall have a minimum 30% overlapped.

186 The active part shall go through vapor phase drying process (VPD) before placed in tank and filled with insulating oil.

187 All the leads shall be permanently stamped with their own ID and not with marker. Leads shall be fastened with cleats (pressboard clamps).

188 If there is a Series Transformer in the design, the turn ratio and the resistances of all its windings shall be measured and documented before the leads have been made. The document shall be provided to JEA.

In such case, if the regulation winding is the innermost winding, proper calculations shall be made and provided to JEA regarding the temperature rise and hottest spot gradient of the winding as that winding cannot be accessed during the temperature rise test. Therefore, if it is found necessary (agreed by Purchaser), proper paper insulation with higher thermal capability (such as Nomex) shall be used for that winding.

189 De-Energized Tap Changer (DETC)

190 The operating handle shall have provisions for padlocking and shall be located no more than 60 inches (1,500 mm) above ground level. The tap position indicator shall be clearly visible from ground level.

191 The DETC shall be full capacity for all tap positions and the contacts shall be maintenance-free.

The 3-phase transformers shall have a DETC mechanism such that no separate operation is required for tap-changing each phase. DETC Contacts shall be silver plated.

192 There shall be provisions for accessing the DETC without removing the cover. Each DETC shall have a nameplate.

A locking mechanism shall be provided, the locking device shall accept use of padlock.

193 Insulating Oil

194 Unless otherwise specified, insulating oil for complete filling shall be furnished with each transformer. The oil shall not contain any polychlorinated biphenyls (PCBs) and shall be Type II, inhibited with 0.15 percent to 0.30 percent by weight of DBPC (2-6 ditertiary butyl paracresol).

Source: 16151, 2023, 1.8 Power Transformers Page 17 of 81

195 The transformer main nameplate shall state that the oil is inhibited and contains no detectable PCBs (<2ppm) at the time of manufacture.

196 The electrical insulating mineral oil to be permanently installed in all transformers furnished under these specifications shall be new, unused oil. The oil shall be tested in accordance with ASTM D-1275, Method B and to Doble CCD or IEC/CIGRE CCD, and shall be deemed "non-corrosive" according to criteria stated in these documents.

197 Also, a Dibenzyl Disulfide (DBDS) test shall be performed and shall yield results less than 20 mg/kg by weight. Results of these oil tests shall be submitted to JEA at least 15 days before the oil is dispatched to the site (whether in the transformer body or by separate transport means.

198 The Oil Quality shall meet the limits of the latest revision of the applicable standards.

199 Oil shall be shipped by bulk container, such as a tanker or large flexible tank, designed specifically for such use. Shipment in drums is not allowed unless approved by JEA. Each shipping container shall have its oil tested for dielectric integrity prior to being installed in the transformer.

200 When shipping weight permits, the transformer shall be shipped oil-filled. If the transformer is shipped without oil, then it shall be shipped pressurized with dry air or nitrogen.

201 A pressure vacuum gauge and suitable shutoff valve shall be provided to monitor or add dry air or nitrogen during shipment.

202 Each transformer and its associated equipment shall be designed and delivered capable of full vacuum filling in the field. The manufacturer's recommended assembly and filling procedures shall be submitted for Purchaser's review prior to shipment.

203 Oil Preservation System

204 The system shall include a gauge alarm contact and a gas sampling valve at ground level.

205 The system shall be designed with an oil temperature alarm range of -13° F to 248° F (-25° C to 120° C). Unless specified, the Supplier will have the option of furnishing a sealed tank system, an automatically maintained inert gas pressure system, or a sealed bladder conservator system. Based on this choice, the appropriate following paragraph shall be applied:

Inert Gas Pressure System

An alarm device with alarm contacts for remote indication of low gas supply shall be furnished. Valves shall be provided to permit purging the gas space and testing the seal on the tank by admitting dry nitrogen under pressure. The gas control equipment, including adequate space for nitrogen bottles, shall be protected by an easily accessible weatherproof stainless steel enclosure mounted on the transformer at the ground level. Sufficient nitrogen gas shall be furnished for the initial flushing, filling, and operation. If necessary, used gas cylinders may be returned to the manufacturer at his expense. A flexible hose made from stainless steel shall be provided between cylinder and regulator. Proper pressure gauge and alarms shall be provided.

207 Bushings

208 Bushings mounted in a vertical position shall have a self-contained oil supply if they are oil type. Bushings shall be mounted on a raised flange.

209 Oil-filled bushings shall have a sight gauge or other means to indicate oil level.

Source: 16151, 2023, 1.8 Power Transformers Page 18 of 81

210 All bushings shall be condenser type, with capacitance graded layers of insulating material for the purpose of controlling the distribution of the electric field, and shall be equipped with a capacitance or power factor test tap. If the bushing is mounted in a metal enclosed bus duct, the external terminal shall be designed for connection to a bus operating at 221° F (105° C). Gaskets, oil expansion areas, and paper insulation used in the assembly of the bushings shall be suitable for the required operating temperatures. All bushings shall be constructed by using wet process porcelain materials with a homogeneous surface. Porcelain parts of each bushing rated below 450 kV BIL shall be one piece. For "draw lead" type bushings, the transformer outline drawing shall indicate the size, number of strands, and material of the bushing draw lead.

211 Each bushing shall have a nameplate that includes the general information and electrical characteristics such as BIL, tested capacitances (C1 & C2) and power factors or Tan δ.

Bushings below 1200A shall be Draw-lead type. All bushings supplied with the unit shall be tested on the transformer regardless of the vendor’s test certificate.

Bushings shall not limit the loading capability of the transformer.

Bushings’ power factor C1 shall not exceed 0.5 at 20° C, and C2 shall not exceed 1% at 20° C.

The only exception for C1 power factor is the resin impregnated paper insulated bushings below 150kV BIL that shall not exceed 0.85% at 20° C.

212 Outline drawings of each bushing shall be included with the transformer approval drawings.

Instruction manuals for each style of bushing shall be included with the transformer instruction manuals.

213 Terminals

214 Bushings shall be supplied with a NEMA 4-hole stud connector selected according to the bushing current rating. Aluminum-to-copper bimetallic transition plates shall be furnished.

215 At 230 kV and above, the terminals shall be corona free. System line connections will first connect to the associated surge arrester, if specified

216 Terminations to the Transformer

217 If a termination compartment is specified, then an air termination compartment should be provided on the tank wall to allow for cable entry from below. Details shall be provided with outline drawings.

218 Supplier shall provide a bolted flange connection to cable, nonsegregated, segregated, or isolated phase bus duct as specified.

219 Termination flanges shall be installed to within +/- 1/8” (3 mm) tolerance of the location indicated on the transformer outline drawing. Horizontal flange surfaces shall be level to within 1/8” (3 mm) tolerance side-to-side across the face of the flange. Vertical flange surfaces shall be installed “plumb” and oriented perpendicular to the centerline of the mating bus within 1/8” (3 mm) tolerance side-to-side across the face of the flange.

220 Neutral Grounding Resistor (NGR)

221 If specified, an NGR shall be mounted on the transformer and shall be of the heavy-duty, outdoor, stainless steel strip type with aluminum enclosure. The resistor assembly shall rest on station post type porcelain insulators. Electrical terminals on the resistor shall be insulated bushings. One resistor terminal shall be connected by copper bar bus to the transformer neutral and the other resistor terminal shall be connected by copper bar bus to the transformer ground pad. The grounding resistor enclosure shall be painted the same color as the transformer tank.

Source: 16151, 2023, 1.8 Power Transformers Page 19 of 81

222 Current Transformers (CTs)

223 CTs shall be of the bushing type and shall be mounted internal to the transformer tank. Multi-ratio CTs must have five leads. The continuous current thermal rating factor (TRF) shall be

2.0 minimum. The CT secondary leads shall be fed through the tank to a CT junction block and then brought down to the transformer control cabinet. CT excitation and overcurrent curves shall be submitted for approval.

All CTs shall be accessible for replacement without removing the active part.

224 Cooling Equipment and Controls

225 Integrally mounted, removable cooling equipment shall be provided to maintain the specified transformer rating.

226 Radiators mounted on the transformer shall be detachable.

227 Manual control switches shall be provided in the control cabinet to allow testing and maintenance of the cooling fans and pumps, and for selecting automatic or manual control.

Controls shall provide for changing the sequence of cooler groups.

228 If any of the Supplier's control switches include an off position that prevents operation of any of the cooling equipment, a Form C alarm contact shall be provided for JEA's use.

229 The cooling equipment control system shall have terminal points for incorporating a normally closed contact from JEA's protective relaying equipment. The open status of this contact shall stop the operation of all cooling equipment.

230 Multiple contact points shall be provided for cooling systems that have redundant, separate power supplies.

231 On ODAF only transformers, cooling equipment controls shall be arranged so that no single fault in the control circuitry will cause a loss of more than one half of the transformer's megavolt-ampere (MVA) capability.

232 Cooling fans shall be located a minimum of 24 inches (610 mm) above the base of the transformer. Personnel protection OSHA-compliant guards shall be placed over fan blades.

Fans shall be mounted on the sides of the radiators. Bottom mounted fans needs Purchaser’s approval before using in the design.

233 Cooling Equipment Maintenance

234 To support the removal and maintenance of the equipment without draining oil or removing the transformer from service, the following shall be provided:

Isolation valving for each cooler and/or each pump.

Flange mounted, manually operated shutoff valves with bolts and provisions for padlocking in the open or closed position.

Oil-tight covers for each connection to be used when cooling equipment is detached.

Lifting eyes, oil drain, and vents for each cooling unit piping and pump section.

Source: 16151, 2023, 1.8 Power Transformers Page 20 of 81

235 In addition, supports for arresters, conservator tanks, etc., mounted above the cooling equipment must be designed in such a way that no disassembly is required to access the cooling equipment for removal.

236 Alarms and Indicators

237 Alarm indication contacts shall be of the dry type, electrically separate and insulated from the ground, for operation on the specified dc control power system. All alarm and spare contacts and indication leads shall be wired to terminal blocks in the control cabinet for use by JEA.

238 These contacts shall be Form C, one normally open and one normally closed contact, which change status on an alarm condition. The functional description and actuation state of all alarm (and trip) contacts shall be clearly indicated with recommended set points, as applicable, on the Supplier's electrical schematics and interconnection wiring diagrams.

239 A dial type liquid temperature indicator relay shall be furnished to indicate top oil temperature.

In addition to providing visible indication, it shall be equipped with separate high alarm and high-high alarm contacts, and with a manually resettable maximum temperature indicating hand.

240 A dial type, hot spot winding temperature indicator relay shall be furnished for the hottest winding. In addition to providing visible indication of the temperature of the winding, each indicator relay shall be equipped with separate alarm and control contacts for the cooling equipment.

241 Each winding temperature indicator relay shall incorporate a current transformer responsive to its associated phase winding current, calibrating resistor, temperature detector element, and heater, all mounted and connected to simulate the hot spot temperature of the winding.

242 If specified, an additional temperature detection system shall be furnished for the remote logging of oil temperature and hot spot winding temperature. The hot spot devices shall be located in one phase of each winding.

243 Each detector shall have 3 wire or 4 wire shielded cable and shall be either 10 ohm copper at 77° F (25° C) or 100 ohm platinum at 32° F (0° C) as indicated on the 16151 Specification Sheets.

244 A fault pressure relay and gas detector relay or Buchholz type system (combination gas detector and oil surge) shall be provided that will operate upon gas accumulation and for abnormal rates of pressure rise in the main tank and OLTC compartment, if provided. The system shall not be affected by mechanical shock, inrush currents, or impulse voltages.

245 The fault pressure relay system shall provide an auxiliary seal-in relay and reset switch arranged and connected to provide manually resettable lockout function on operation of the primary element. Isolation valves shall be provided for the testing of sudden pressure monitors.

246 The auxiliary seal-in relay shall be designed for operation on a dc protection scheme, shall include four electrically separate, field convertible contacts for use with remote equipment, and shall be mounted inside the main control cabinet.

247 A local dc indicating light shall be furnished to indicate relay reset required. Units not having oil conservator tanks do not require gas detection relays.

248 If cooling pumps are provided, an oil flow indicator with alarm contacts shall be provided for each pump

249 If cooling pumps are provided, an oil flow indicator with alarm contacts and bearing wear monitor system shall be provided for each pump.

Source: 16151, 2023, 1.8 Power Transformers Page 21 of 81

250 If specified, a fault gas monitoring system shall be installed and shall be capable of detecting combustible gases and providing visual indication. Alarm contacts shall be provided for remote indication. The fault gas sensor shall be positioned in the tank as recommended by the manufacturer.

251 If a dissolved gas monitoring system is specified it shall be capable of detecting all combustible gases (hydrogen, methane, ethane, ethylene, acetylene), oxygen, carbon monoxide, carbon dioxide and moisture and providing a digital link to plant monitoring systems.

252 Data shall also be able to be downloaded on to a portable computer at the device. Required software for downloading and analyzing data shall be provided.

253 Alarm contacts shall be provided for remote indication. The fault gas sensor shall be positioned in the tank as recommended by the manufacturer.

254 Transformer gauges shall be tilted for ease of reading from ground level.

255 Additional Accessories

256 Sudden Pressure Relay(s) (SPR) or sometimes called Rapid Pressure Rise Relays (RPRR) including the seal-in relay shall be supplied with the transformer.

Pressure Relief Device(s) (PRD) shall be installed on the tank (and a separate PRD shall be mounted on LTC compartment – if any).

257 A stainless steel nameplate shall be provided and mounted on the transformer such that it can be easily read at the eye-level.

258 The following accessories shall be provided and clearly identified in the proposal:

Resetting mechanical pressure relief device with alarm contact and visual indicator. Associated piping, fittings, and attachments shall be provided to route the discharge from the pressure relief device to grade.

Valve for drainage of the oil to within 1 inch (25 mm) of the bottom of the tank, including built-in, capped sampling connection on the discharge side.

Upper filter valve located below the 77° F (25° C) liquid level and on the diagonally opposite wall as the drain valve for the return of filtered oil to the transformer.

One set of single-pole, double-throw (spdt) alarm contacts for liquid level indicator and mechanical pressure relief device.

Two grounding pads on each transformer tank,…