Amendment_No._006 _Specification_Sections.pdf

Amendment No. 006 Trinity Powerplant Generator Rewinds Specifications No. 20-C0841

Contract Document Management System

01 31 30 - 1

SECTION 01 31 30

CONTRACT DOCUMENT MANAGEMENT SYSTEM

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Cost:

1. Include in prices offered in the Price Schedules for other items of work.

1.02 DEFINITIONS

A. CDMS: Contract Document Management System.

1. Contract Documents include, but are not limited to:

a. Specifications.

b. Contract Drawings.

c. Submittals.

d. RFCs : Request for Change (Contractor generated document).

e. RFIs: Request for Information (Contractor generated document).

f. RFPs: Request for Proposal (Government generated document).

g. CMs: Contract Modifications.

h. Contractor Proposals.

i. Value Engineering Proposals.

j. Government Inspection Reports.

k. Contract Schedules.

l. Meeting Agendas and Meeting Minutes.

m. Letters and Memos.

1.03 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 - Submittals.

B. RSN 01 31 30-1, Approval Data:

1. System provider experience, number of systems operating, references.

2. Documentation of system capabilities.

3. Instructions for system use.

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C. RSN 01 31 30-2, Final Data:

1. DVD or CD of documents uploaded to CDMS.

1.04 QUALIFICATIONS

A. System provider: At least 5 years successful performance in providing required services.

1.05 CDMS REQUIREMENTS

A. CDMS shall be capable of generating, storing, tracking, categorizing, and managing Contract Documents.

B. Access:

1. Web-based:

a. Contract Documents are stored and accessed by authorized individuals via an internet site.

b. Compatible with web browsers MS Internet Explorer, Apple Safari, Mozilla Firefox and Google Chrome.

2. Ability to upload Contract Documents and make available for user download in supported file formats, minimum:

a. Adobe Acrobat.

b. MS Word.

c. MS Excel.

d. MS Project.

e. Oracle Primavera P6 Project Manager.

f. Autodesk AutoCAD.

3. Allow Contract Documents to be prepared by the Contractor or by Government.

a. Preparing organization will control access of documents. See Document Security and Backup paragraph below.

4. Contractor and Government shall each have a project manager for CDMS.

a. Each project manager shall have capabilities to assign users within their organization and to assign user rights which control access to documents based on user class and document type.

b. Each organization shall be capable of defining its access hierarchy.

c. Inclusion of users will be prerogative of organizational project manager.

d. Government shall be able to create and modify project properties (i.e., Contractor, project location, description, bid amount, project directory, etc.).

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5. Email notifications shall be automatically sent to selectable users when new documents are submitted and available for viewing, or alerts are generated.

Examples:

a. Updates to project information (e.g., entry of a new submittal).

b. Changes to project information (e.g., approval of a submittal).

c. Alerts (e.g., submittal under review for greater than 15 days without action).

6. Ability to link files; examples:

a. RFP linked to a CM.

b. Submittal linked to a Specification Section or Drawing.

C. Reports:

1. Generate reports that list and sort documents by status, examples include:

a. Submittals that have been approved.

b. Invoices paid to date.

c. RFIs under review.

2. Generate alerts when documents requiring action approach or exceed allowable time.

3. Generate customizable summary reports, examples include:

a. Submittal Turn-around.

b. RFI Turn-Around.

c. CM Processing Turn-Around.

d. Total CM costs.

e. Total CM Request Exposure.

4. Reports shall be printable, exportable as searchable pdf or printer friendly HTML, and exportable to Excel, XML, CSV, or Word.

5. Ability to link from an item in a report directly to item by clicking on it.

a. For example: in a submittal report, clicking on a submittal that is 15 days old takes you directly to information on that submittal.

6. Capable of producing a complete and logically organized set of documents within CDMS in both pdf and xml format.

D. Document Security and Backup:

1. SSL encryption for secured data exchange between browser and server (Secure access to documents and information).

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2. Allow document access security until authoring party chooses to share it with others.

a. Show parties that have access to a document.

b. Extent of document sharing shall be determined by authoring party.

c. Once documents are shared, track documents so that changes cannot occur without a record of changes.

3. Backup/Archiving to FTP site of documents to which an organization has access on a regular (minimum monthly) basis.

a. Backups shall be in pdf format.

4. Documents shall be downloadable to FTP sites where Government and other organizations can each access their own data confidentially.

E. General Tracking and Control:

1. Documents shall be grouped into categories (Submittals, RFC, RFI, RFP, CM, Daily Inspection Reports, Meeting Minutes).

2. CDMS shall track:

a. When documents were received or returned, as well as status of documents (e.g. Under Review; or Returned, Approved or Rejected, etc.).

b. Document changes including who entered or changed document and date change was made.

c. When a reviewer has opened an item.

F. Submittal Tracking and Control:

1. Ability to create master list of submittals (“Schedule of Submittals”).

2. Supply standard submittal form for entering information. CDMS shall allow customizing of standard submittal form. Contractor shall be able to enter submittal summary information (required submittal number, title, description, due date, and specification section shall be required fields) and then upload submittal data in electronic format.

3. Track date received, date response due, date returned, and approval status.

a. Status designations may be modified to fit Government standard designations - A/AAN/PAR/NA/ACK (Approved/Approved As Noted/Partially Approved - Resubmit/Not Approved/Acknowledged).

4. Supply Submittal Tracking form for Government to enter review comments and action taken. CDMS shall allow customizing of submittal tracking form.

a. Allow for Government to route submittal to third parties by generating design-review transmittals with each submittal package item, to track

01 31 30 - 5 status of individual sub-items within submittal package, and to route each sub-item to appropriate reviewers.

5. Ability to generate automatic notification after specified days without response.

G. RFI Tracking and Control:

1. Supply standard RFI form to enter information.

2. Ability to create or attach documents to the RFI form or links to other documents within CDMS.

3. Ability for Government to route RFI to appropriate reviewers and for reviewers to enter comments into standard response form.

H. Inspection Reports Tracking and Control:

1. Ability to attach Government standard inspection and report forms into CDMS and ability to create customizable inspection forms in CDMS. Typical forms:

a. Daily Inspection Report (DIR).

b. Survey requests.

c. Plant inspection reports.

d. Testing reports.

2. Ability to link or attach photos to forms and link forms to other documents within

CDMS.

I. Contract Modifications:

1. Supply standard Contractor Proposal form with ability to attach documents and link to other documents within CDMS.

2. Supply ability to upload Government’s standard CM form and RFP forms, or create an acceptable alternative, to enter information.

3. Ability to attach documents to these forms, and link to other documents within

CDMS.

4. Ability for Contractor to respond to RFP and CM form with Cost & Time impacts.

5. Ability to track date CM issued and date responded, with automatic notification after specified days without response.

J. Correspondence:

1. Ability to generate letters and memos.

a. Ability to attach documents to letters and memos, and to reference other documents within CDMS.

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b. CDMS shall ability automatically assign sequential numbers to letters and memos.

2. Ability to generate responses to letters and memos.

a. System automatically generates memo suffixes; e.g., 1st response to Memo 32 to be 32.1, 2nd response to be 32.2, etc.

3. Official correspondence from Government to Contractor shall contain Government’s official letterhead and corresponding logos.

4. Ability to generate meeting agendas and meeting minutes and to attach documents to minutes.

a. CDMS shall automatically assign sequential meeting numbers.

K. Miscellaneous Tracking and Controls. Ability to:

1. Generate reports tracking RFCs, RFIs, RFPs, CMs, Submittals, Memos, DIR’s, survey requests, plant inspection reports and testing reports.

2. Filter Logs Based on Criteria:

a. Submittals: Specification Section, Days Out, Status (A/AAN/R&R/

ACK/RWR).

b. RFI’s: Days out, Status (Open/Closed), Specification Section/Dwg No., Responsibility/Ball-In-Court.

3. Sort Logs based on a criteria; e.g., for Submittal, Specification Section, Days Out, Status, or other criteria determined by the COR.

4. Supply forms to match Government’s CM Form or other forms when needed.

5. Track Cost Exposure with links to RFI and CM requests.

6. Measure productivity benchmarks on a project such as computing average review days for RFIs and submittals, categorize CMs, and track total CM percentages by category.

7. Keyword search of documents in database.

L. Budget and Funding Source Tracking:

1. Ability to enter funding sources and assign contract line items to multiple funding sources.

PART 2 PRODUCTS

Not Used

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PART 3 EXECUTION

3.01 IMPLEMENTATION

A. CDMS shall be in place and operating before Contractor transmits Contract Documents to Government, except RSN 01 31 30-1, Approval Data.

1. CDMS operation includes COR, or other authorized Government representative, having program control to assign users and user rights to Government personnel to access appropriate areas of system.

B. Contractor shall input Schedule of Submittals before making submittals. Include:

1. RSNs listed in Table 01 33 00A - List of Submittals.

2. Scheduled submittal date.

C. Contractor shall provide a report of submittal status monthly or as requested by COR.

Submittal status report shall be in a table format and include:

1. Required Submittal Number (RSN).

2. Section Title.

3. Submittal Title.

4. Date Submitted.

5. Date of Response.

6. Approval Status (Approved-Complete, Approved as Noted - Resubmit, Received, Not Approved).

7. Days in Review.

8. Due Date.

D. CDMS shall be operational until final project closeout.

END OF SECTION

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Contractor’s Onsite Safety Personnel

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SECTION 01 35 30

CONTRACTOR’S ONSITE SAFETY PERSONNEL

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Cost:

1. Include in prices offered in the Price Schedule for other items of work.

1.02 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 - Submittals.

B. RSN 01 35 30-1, Resume:

1. Contractor’s Onsite Safety Representative.

2. Safety Professional.

C. RSN 01 35 30-2, Safety Inspection Reports:

1. List noted deficiencies, their abatement dates, and follow-up action for jobsite activities.

2. Base inspection report on findings of jobsite walk-through with Government personnel.

1.03 QUALIFICATIONS

A. Contractor’s Onsite Safety Representative:

1. Safety trained supervisor with safety responsibility adjunct, corollary or ancillary to their duties. Their main job duties are a craft or trade, in leadership, supervision/management, or in a technical specialty.

2. Has completed at a minimum OSHA recognized 30-hour Construction Industry training program and has a minimum of 3 years of experience on projects similar to this contract.

B. Safety Professional:

1. Holds professional status in the safety field by virtue of education, training, certification and experience.

1.04 APPLICATION

A. Designate an employee as the Contractor’s Onsite Safety Representative prior to start of construction.

Contractor’s Onsite Safety Personnel

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B. Contractor’s Onsite Safety Representative Authorities, Duties, and Responsibilities:

1. Full authorization to correct unsafe acts on the spot.

2. Prepare safety inspection reports.

3. Onsite during construction activities.

C. Safety Professional Duties and Responsibilities:

1. Review and approve the Contractor’s Safety Program prior to submittal.

2. Visit the site on an as-needed basis, but at a minimum of one time per week month.

1.05 QUALITY ASSURANCE

A. Contractor’s Onsite Safety Representative:

1. The effectiveness of the Contractor’s Onsite Safety Representative in prosecuting the safety program will be subject to continued review and approval by the CO.

2. Should the Contractor’s safety effort be considered inadequate, the CO has the option to require the Contractor to employ a full-time qualified Safety Professional at no cost to the Government.

B. Safety Program:

1. The effectiveness of the Contractor’s Safety Program will be subject to continued review and approval by the CO.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used

Trinity Powerplant Generator Rewinds Specification No. 20-C0841

Stator Cores 48 13 64 - 1

SECTION 48 13 64

STATOR CORES

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Furnish and Factory Test New Stator Core for Generator G1:

1. Payment: Lump sum price offered in Price Schedule A.

B. Install and Field Test New Stator Core for Generator G1:

1. Payment: Lump sum price offered in Price Schedule A.

C. Furnish and Factory Test New Stator Core for Generator G2:

1. Payment: Lump sum price offered in Price Schedule B.

D. Install and Field Test New Stator Core for Generator G2:

1. Payment: Lump sum price offered in Price Schedule B.

E. Stator Core Spare Parts for Two Generators:

1. Payment: Lump sum price offered in Price Schedule C.

1.02 REFERENCE STANDARDS

A. ASTM International (ASTM)

1. ASTM A343/A343M-14 Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method and 25-cm Epstein Test Frame

2. ASTM A717/A717M-12 Surface Insulation Resistivity of Single-Strip Specimens

3. ASTM E376-11 Measuring Coating Thickness by Magnetic Field or Eddy-Current (Electromagnetic) Test Methods

4. ASTM E1282-11 Specifying the Chemical Compositions and Selecting Sampling Practices and Quantitative Analysis Methods for Metals, Ores, and Related Materials

B. American Welding Society (AWS)

1. AWS D1.1/D1.1M - 2010 Structural Welding Code – Steel

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C. Institute of Electrical and Electronics Engineers (IEEE)

1. IEEE 62.2-2004 Diagnostic Field Testing of Electric Power Apparatus – Electrical Machinery

D. National Electrical Manufacturer’s Association (NEMA)

1. NEMA 250-2014 Enclosures for Electrical Equipment (1000 Volts Maximum)

1.03 DESIGN REQUIREMENTS

A. Core and winding combination shall maximize generator efficiency at rating specified in Section 48 13 71 –Armature Windings. Provide the same design and materials for both units.

B. Optimize lamination thickness; surface insulation film type and thickness; number of air ducts; and clamping assembly materials and arrangement to minimize core losses.

C. Stiffness, rigidity, and resonance characteristics of core and clamping bolt assemblies shall minimize temporary and permanent core distortion, material fatigue, waviness, and vibration.

D. Design laminations for use with key bars and for continuous stacking, spanning frame splits.

E. Design laminations and key bar interaction for core thermal expansion and contraction.

F. Vertically align core slots; arrange vent ducts and spacers between lamination packets for optimal air circulation through existing coolers.

G. Coordinate clamping devices at each core end; prevent lamination looseness including finger areas near bore. Maximize the length of the core clamping bolts that will be pre-tensioned when during torqueing of the nuts.

1.04 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 - Submittals and 01 33 26 - Electrical Drawings and Data.

B. RSN 48 13 64-1, Approval Drawings and Data:

1. Calculated flux densities and losses for new core.

2. Drawings showing design and details:

a. Laminations, special laminations and vent spacers including materials, dimensions, and coatings.

b. Clamping assembly including fingers, flanges, bolts, nuts, and keybars showing materials and dimensions.

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c. Overall stator assembly details including stator frame, stator winding, stator core including air gap requirements, air ducts, and clamping bolt assemblies.

d. Bill of materials.

3. Resistance Temperature Detectors (RTDs): wiring diagrams and assembly details.

4. New generator junction box:

a. Manufacturer’s technical data including terminal blocks.

b. Location and installation details.

c. Wiring diagram.

C. RSN 48 13 64-2, Manufacturing and Factory Test Procedures:

1. Factory test procedures and acceptable test criteria.

2. Manufacturing procedures and quality control measures including lamination punching or cutting, insulating film characteristics, and finishing operations.

D. RSN 48 13 64-3, Factory Test Reports:

1. Furnish reports or records and data for each factory test preformed.

E. RSN 48 13 64-4, Field Assembly and Test Procedures:

1. Core stacking and clamping:

a. Method of keybar attachment and verification of concentricity, roundness, and verticality.

b. Stacking and compacting of partial layers.

c. Method of checking and adjusting stator core compression and level, including clamping and bolt tension or torque control.

d. Final pressing procedure including compression amount and final torqueing of clamping bolts.

2. Core loop test procedures:

a. Calculations of operating flux, magnetizing current, and ampere-turns required to establish appropriate flux levels for detecting overall and differential heating of core iron.

b. Procedure for installing magnetizing and search coil loops, including safety precautions for equipment and personnel.

c. Method of general and differential heat monitoring and recording.

F. RSN 48 13 64-5, Final Data:

1. Dimensions of finished laminations; installation records, finished stack dimensions, and core compression; and RTD wiring.

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2. Bill of materials.

G. RSN 48 13 64-6, Field Test Reports:

1. Furnish data and video records of core loop flux tests.

1.05 QUALIFICATIONS

A. Designer:

1. Professional Engineer experienced in design of this type.

B. Manufacturer:

1. Company specializing in manufacturing products specified in this Section with minimum three years documented experience.

C. Welders: Certified per AWS D1.1 requirements.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Do not ship materials or equipment until required tests, analyses, shop inspections are completed, submittals are approved by Government, and Government gives permission to ship or inspection at shipping point is waived.

B. Coordinate onsite storage with COR.

1.07 EXTRA MATERIALS

A. Furnish with same material and workmanship identical to installed parts of generator and that meet requirements of these specifications.

B. If items intended as spare parts are used for replacements during installation process, they shall not deplete number of spare part sets required to be furnished.

C. Mark and package spare parts for storage in separate moisture tight wrappings or containers.

D. Furnish the following spare parts (total for two generators): 2,000 full laminations and 2,000 total step-back laminations.

PART 2 PRODUCTS

2.01 LAMINATIONS

A. Thin, non-aging, cold-rolled silicon steel with low hysteresis loss, produced and sample tested in accordance with ASTM E1282.

B. Two-sided coating with insulating varnish resistant to water, industrial solvents, and lubricating oil; control coating thickness in accordance with ASTM E376.

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C. Smooth edges; oriented and treated for assembly to reduce eddy current losses due to surface bridging.

D. Provide split-tooth or step-back lamination at both ends of core.

E. Provide thicker vent laminations at ends of lamination packets.

F. Provide non-magnetic vent spacers between lamination packets and spot welded on one side to vent lamination.

2.02 CLAMPING FLANGES AND FINGERS

A. Clamping Flanges: Provide with adequate strength to transmit clamping press to clamping fingers.

B. Clamping Fingers:

1. Non-magnetic; relative permeability less than 3 under operating conditions specified in Section 48 13 71 – Armature Windings.

2. Integral or separately arranged solid fingers, adequately supporting laminations in slot tooth area. If separate fingers are used, align and support them securely under clamping flanges.

2.03 CLAMPING STUDS, NUTS, BOLTS, VENT SPACERS AND KEYBARS

A. Provide new through bolts, nuts and key bars. Provide necessary hardware for installation of key bars.

B. Provide separate keybars and clamping bolts. Do not weld clamping bolts near the core ends to allow for the majority of the bolt to be pre-tensioned.

C. Clamping bolts shall be of ASTM or SAE standards with proof stress greater than the required pre-stress.

D. Provide clamping pressures with adequate safety factors under operating conditions specified in Section 48 13 71 – Armature Windings.

E. Assembly of clamping bolts, keybars and associated materials, at nominal range of clamping pressures, to be free from resonance at operating frequencies and dominant harmonics.

2.04 RESISTANCE TEMPERATURE DETECTORS (RTD)

A. Provide 20 copper, 10-Ohm RTDs, plus/minus 0.2 percent at 25 degrees Celsius.

B. Nominal Temperature Coefficient of Resistance: 0.00427 Ohm/Ohm/degree Celsius.

C. Leads: 4-conductor, stranded, tinned copper encapsulated in flexible heat-cured compound or protected with acrylic resin-coated fiberglass sleeving.

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2.05 GENERATOR RTD BOX

A. Type: NEMA 250, Type 12.

B. Full size back panel.

C. Seams continuously welded and ground smooth.

D. Continuous door hinge.

E. Pad-lockable handle.

F. Wall-mountable.

G. Terminal blocks:

1. Provide appropriate number of terminal blocks for new armature winding RTDs, stator core RTDs, generator CTs, and air-gap probes.

2. Type: Molded-block with molded-insulating barrier between terminals.

3. Terminals: Binding-head or washer-head screws with serrated or grooved contact surfaces allowing for ring-tongue connectors.

4. Full-size marking strips.

2.06 CONTRACTOR SOURCE QUALITY TESTING

A. Sample lots of sheet steel or finished laminations:

1. Epstein test:

a. Test sheet steel samples in Epstein frame in accordance with ASTM A343; record sample weight, thickness, specific iron losses, and permeability; furnish test results.

2. Franklin test:

a. Test insulation properties in accordance with ASTM A717; record electrical resistivity data and statistical distribution within sample batch;

furnish test results.

3. Insulation thickness and ductility:

a. Test insulation thickness in accordance with ASTM E376; furnish test results.

b. Determine bending angle from horizontal when insulation film separates after single bend over 3/4-inch mandrel; furnish test results.

c. Record other observations on insulation cracking or film application flaws; furnish together with test results.

B. Quality Control Measures:

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1. Coordinate sampling frequencies with batch sizes of incoming materials. Monitor incoming inspection results in conjunction with manufacturing controls to limit hysteresis and eddy current losses in final core assembly.

2. Maintain optimal punching die or laser cutting machinery performance for lamination finish quality and dimensional consistency.

C. RTD Test:

1. Test RTDs at 25, 80 and 120 degrees Celsius.

PART 3 EXECUTION

3.01 PREPARATION

A. Frame preparation: Provide qualified inspector to perform a visual inspection of the stator frame including frame splits, welds, and support assemblies for mechanical integrity and alignment.

3.02 INSTALLATION

A. Installation of Key Bars:

1. Install key bars to frame concentric about the unit centerline. Concentricity shall be within plus or minus 2 percent of the nominal air gap.

2. Verticality and circularity shall be within plus or minus 5 percent of the nominal air gap.

3. Verify the circularity, verticality, and concentricity after installation.

4. Perform welding in accordance with AWS D1.1.

5. Paint areas on frame with primer and match existing color where original paint was removed for welding of key bars.

B. Core Assembly:

1. Adequately key laminations to frame key bars.

2. Support lamination stack by clamping flanges, fingers, and bolts at both core ends.

3. Stagger-stack laminations in continuous layers on temporary bottom supports.

4. Furnish adequate number of laminations to support installation needs.

5. Intermediately press core packets on stacking guides for smooth slot surfaces.

a. After each core press, measure the core for proper alignment including level, circularity, verticality, and concentricity.

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b. After final press verify core concentricity to be within plus or minus 2 percent of the nominal air gap, and verticality and circularity to be within plus or minus 5 percent of the nominal air gap.

6. Install, align, and secure vent spacers between lamination packets.

7. Final press with clamping flanges and studs in place to manufacturer’s clamping pressure specifications.

C. Slot Preparation:

1. Coat stator core slots evenly with semi-conducting, heat-resistant compound to provide corona shielding.

2. Coordinate film thickness with slot and bar width to accept the new winding required in Section 48 13 71 - Armature Windings.

3. Application of coating by compressed air methods is not acceptable.

4. Prevent excess paint from contaminating adjacent areas.

D. RTDs:

1. Distribute 20 RTDs evenly around on back of core, producing temperature profile representative of core bulk heating during operation.

E. RTD Cables:

1. Install RTD extension cable from leads of stator RTDs to new generator RTD terminal box. Terminate with soldered ring terminals on terminal blocks on new generator RTD box shared with armature winding RTDs.

F. Generator RTD Box:

1. Install new generator RTD box next to the existing generator terminal box.

2. Terminate new stator core and armature winding RTD wires, generator CT wires, and aig-gap probe wires in new generator RTD box.

3. Seal air-housing penetrations to prevent gas, smoke and fire from exiting air-housing.

4. Form wiring into compact groups bound together and firmly supported. Run wiring groups straight, horizontally, or vertically with short-radius, right-angle bends.

5. Support and secure wire bundles with cable tie mounting bases. Mounting cable tie bases with only adhesive will not be allowed.

6. Install ring tongue pressure-crimp-type connectors for terminations at terminal blocks.

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3.03 CONTRACTOR FIELD QUALITY TESTING

A. Test for general core alignment, concentricity of bore, uniform slot dimensions, smooth walls, and uniform clamping pressures in accordance with manufacturer’s recommendations and applicable IEEE standards.

B. RTDs:

1. Confirm proper identification.

2. Prepare for use with core heating tests to correlate data between independent recording sources.

C. Perform Core Loop Flux Test:

1. Stator core high energy test in accordance with IEEE 62.2.

2. Provide power source.

3. Provide magnetizing (excitation) coil conductors around stator core, (exclude frame if practical).

a. Unshielded insulated conductors rated for required excitation current and voltage.

b. Divide magnetizing coil conductors in two or more groups spaced approximately equally around core periphery.

c. Provide insulating supports to maintain a minimum 3-inch clearance from conductors to metal parts of machine, (core and frame).

4. Provide single-turn search coil around cross section of stator core, excluding the frame if practicable.

a. Place in bottom of a slot and displace from magnetizing coil conductors.

b. If entire cross section of core is not accessible for the search coil, encircle largest possible portion of core cross section and proportionally scale measured induced voltage in the search coil to the full cross sectional area of the core.

5. Monitor magnetizing coil current and voltage and search coil voltage during test.

Use true rms reading volt and amp meters.

6. Provide over-current and ground fault protection for the magnetizing coil circuit.

7. Install four or more contact type temperature sensors, (thermocouple, etc.), on back of core, (frame side), in equally spaced locations around the periphery and in the center third section of the core stack.

8. Record ambient air temperature and core temperature prior to initiation of test.

9. Perform trial test run to adjust magnetizing coil power supply or number of turns in coil as necessary to achieve approximately rated voltage core flux density.

10. Perform test at approximately 80 to 100 percent of normal working flux density at rated frequency for minimum of 60 minutes.

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a. Do not exceed rated core temperature rise.

b. Check stator core for hot spots at core surfaces and heat flux within the bulk of the core.

c. Scan core surface temperatures using infra-red thermographic device capable of resolving temperature differences to 1/10 of a degree Celsius.

d. Record temperature patterns at hot spots, back core sensors temperatures, time, magnetizing coil current and voltage and search coil voltage in intervals not exceeding 10 minutes and for 60 minutes after magnetizing circuit is de-energized. Half way into test, scan and record temperature of back core steel, (frame side), if visible, with thermographic equipment.

11. Repair hot spots that exceed a 5 degrees Celsius temperature rise at 100 percent rated flux.

a. Hot spots are located by observing differences in temperature between similar areas of stator core, (e.g. slot bottom, wedge grooves, or tooth face). The temperature rise of a hot spot is determined by comparing measured temperature of the hot area to a sampling of similar areas in other places of the core that represent ambient temperature for that specific part of the core. Do not compare temperatures of non-similar areas of core.

b. Correct the temperature rise of a hot spot for a variation in actual core test flux density from rated flux density by multiplying the observed temperature rise by the square of the ratio of rated flux density to test flux density.

12. After repair of core hot spots, repeat core loop flux test to demonstrate that previously observed hot spots have been corrected and no new hot spots have developed.

D. Core tests required during performance tests: See Section 48 13 71 – Armature Windings.