Arc Flash Study

Added: Apr 27, 2015 8:52 am THIS IS A REQUEST FOR SF-330's, AND NOT A REQUEST FOR PROPOSAL. The Veterans Affairs Medical Center in Canandaigua, NY is seeking the services of a qualified Architectural Engineering (A/E) firm with specialized experience to provide short circuit protective device coordination and arc flash hazard analysis under the supervision and approval of a Registered Professional Electrical Engineer skilled in performing and interpreting power system studies utilizing SKM or Easy Power software. The equipment manufacturer or approved engineering firm shall demonstrate experience with Arc Flash Hazard Analysis with at least ten projects performed in the past year.

This project will include but is not limited to the following:



SCOPE OF WORK

SHORT-CIRCUIT/COORDINATION STUDY/ARC FLASH HAZARD ANALYSIS

PROJECT NUMBER 528A5-15-520

PART 1 GENERAL

1.01 SCOPE

The contractor shall furnish a short-circuit, protective device coordination and arc flash analysis performed in accordance with IEEE Std. 1584-2002 equations that are presented in NFPA70E-2015, Annex D.

The contractor shall perform a review of the Overall Power System and verify all equipment data as required to support a complete study and analysis. Generalized assumptions are not permitted to be utilized for calculations.

The scope of the studies shall include all existing electrical distribution equipment at the Canandaigua VA Medical Center. One line diagrams are not available and the contractor shall provide as part of this contract a new one-line drawing of the existing electrical distribution system. Contract pricing shall be based on (Reference drawings - equipment count) provided below.



Reference Drawings for Equipment to be Analyzed and Labeled:



" Campus Map

" Power System Study for the BioMass Co-Generation project, July 2014



One line diagrams shall detail all equipment in which a label is being provided. This includes all switchgear, switchboards, panelboards, motor control centers, machine control panels, bus ducts and bus plugs as required by the scope of work above. The supplied One line diagrams shall be provided in hard copy format and in AutoCAD format.

Arc Flash label installation shall be included as part of this proposal.

1.01 REFERENCES

Institute of Electrical and Electronics Engineers, Inc. (IEEE):

IEEE 141 - Recommended Practice for Electric Power Distribution and Coordination of Industrial and Commercial Power Systems

IEEE 242 - Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems

IEEE 399 - Recommended Practice for Industrial and Commercial Power System Analysis

IEEE 241 - Recommended Practice for Electric Power Systems in Commercial Buildings

IEEE 1015 - Recommended Practice for Applying Low-Voltage Circuit Breakers Used in Industrial and Commercial Power Systems.

IEEE 1584 - Guide for Performing Arc-Flash Hazard Calculations

American National Standards Institute (ANSI):

ANSI C57.12.00 - Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers

ANSI C37.13 - Standard for Low Voltage AC Power Circuit Breakers Used in Enclosures

ANSI C37.010 - Standard Application Guide for AC High Voltage Circuit Breakers Rated on a Symmetrical Current Basis

ANSI C 37.41 - Standard Design Tests for High Voltage Fuses, Distribution Enclosed Single-Pole Air Switches, Fuse Disconnecting Switches and Accessories.

The National Fire Protection Association (NFPA)

NFPA 70 - National Electrical Code, latest edition

NFPA 70E - Standard for Electrical Safety in the Workplace

1.02 QUALIFICATIONS

The short-circuit, protective device coordination and arc flash hazard analysis studies shall be conducted under the supervision and approval of a Registered Professional Electrical Engineer skilled in performing and interpreting the power system studies.

The equipment manufacturer or approved engineering firm shall demonstrate experience with Arc Flash Hazard Analysis by submitting names and owner contact information of at least ten actual arc flash hazard analyses it has performed in the past year.

The studies shall be performed using SKM or Easy Power software made to analyze the systems used.

PART 2 PRODUCT

2.01 DATA COLLECTION

The engineering firm conducting the power system study shall collect all data as required by the power system studies.

Source contribution shall include minimum and maximum utility contribution.

If applicable, include fault contribution of all existing motors 50 hp and above in the study. The Contractor shall obtain required existing equipment data, if necessary, to satisfy the study requirements.

Data collection shall verify protective devices found within each switchgear line-up, switchboard, panel board and bus duct plug.



2.02 SHORT-CIRCUIT AND PROTECTIVE DEVICE EVALUATION STUDY

Use actual conductor impedances if known. If unknown, use typical conductor impedances based on IEEE Standard 141-1993.

Transformer design impedances shall be used when test impedances are not available.

Provide the following:

Calculation methods and assumptions

Selected base per unit quantities

One-line diagram of the system being evaluated

Source impedance data, including electric utility system and motor fault contribution characteristics

Tabulations of calculated quantities

Results, conclusions, and recommendations.

Calculate short-circuit momentary and interrupting duties for a three-phase bolted fault

at each:

Electric utility's supply termination point

Incoming switchgear

Unit substation primary and secondary terminals

Low voltage switchgear

Motor control centers

Standby generators and automatic transfer switches

Branch circuit panelboards

Machine control panels

Bus Ducts

Other significant locations throughout the system.

For grounded systems, provide a bolted line-to-ground fault current study for areas as defined for the three-phase bolted fault short-circuit study.

Protective Device Evaluation:

Evaluate equipment and protective devices and compare to short circuit ratings

Adequacy of switchgear, motor control centers, and panelboard bus bars to withstand short-circuit stresses

Notify Owner in writing, of existing, circuit protective devices improperly rated for the calculated available fault current.

2.03 PROTECTIVE DEVICE COORDINATION STUDY

Proposed protective device coordination time-current curves (TCC) shall be displayed on log-log scale graphs.

Include on each TCC graph, a complete title and one-line diagram with legend identifying the specific portion of the system covered.

Terminate device characteristic curves at a point reflecting maximum symmetrical or asymmetrical fault current to which the device is exposed.

Identify the device associated with each curve by manufacturer type, function, and, if applicable, tap, time delay, and instantaneous settings recommended. Plot the following characteristics on the TCC graphs, where applicable:

Electric utility's overcurrent protective device

Medium voltage equipment overcurrent relays

Medium and low voltage fuses including manufacturer's minimum melt, total clearing, tolerance, and damage bands

Low voltage equipment circuit breaker trip devices, including manufacturer's tolerance bands

Transformer full-load current, magnetizing inrush current, and ANSI through-fault protection curves

Conductor damage curves

Ground fault protective devices, as applicable

Pertinent motor starting characteristics and motor damage points, where applicable

Pertinent generator short-circuit decrement curve and generator damage point

The largest feeder circuit breaker in each motor control center and applicable panelboard.

Provide adequate time margins between device characteristics such that selective operation is provided, while providing proper protection.

2.04 ARC FLASH HAZARD ANALYSIS

The arc flash hazard analysis shall be performed according to the IEEE Std. 1584-2002 equations that are presented in NFPA70E-2015, Annex D.

The flash protection boundary and the incident energy shall be calculated at all equipment location referenced in 1.01D.

The Arc-Flash Hazard Analysis shall include all significant locations in 240 volt and 208 volt systems fed from transformers equal to or greater than 125 kVA where work could be performed on energized parts.

Safe working distances shall be based upon the calculated arc flash boundary considering an incident energy of 1.2 cal/cm2.

When appropriate, the short circuit calculations and the clearing times of the phase overcurrent devices will be retrieved from the short-circuit and coordination study model. Ground overcurrent relays should not be taken into consideration when determining the clearing time when performing incident energy calculations

The short-circuit calculations and the corresponding incident energy calculations for multiple system scenarios must be compared and the greatest incident energy must be uniquely reported for each equipment location. Calculations must be performed to represent the maximum and minimum contributions of fault current magnitude for all normal and emergency operating conditions. The minimum calculation will assume that the utility contribution is at a minimum and will assume a minimum motor contribution (all motors off). Conversely, the maximum calculation will assume a maximum contribution from the utility and will assume the maximum amount of motors to be operating. Calculations shall take into consideration the parallel operation of synchronous generators with the electric utility, where applicable.

The incident energy calculations must consider the accumulation of energy over time when performing arc flash calculations on buses with multiple sources. Iterative calculations must take into account the changing current contributions, as the sources are interrupted or decremented with time. Fault contribution from motors and generators should be decremented as follows:

Fault contribution from induction motors should not be considered beyond 3-5 cycles.

Fault contribution from synchronous motors and generators should be decayed to match the actual decrement of each as closely as possible (e.g. contributions from permanent magnet generators will typically decay from 10 per unit to 3 per unit after 10 cycles).

For each equipment location with a separately enclosed main device (where there is adequate separation between the line side terminals of the main protective device and the work location), calculations for incident energy and flash protection boundary shall include both the line and load side of the main breaker.

When performing incident energy calculations on the line side of a main breaker (as required per above), the line side and load side contributions must be included in the fault calculation.

Mis-coordination shall be checked amongst all devices within the branch containing the immediate protective device upstream of the calculation location and the calculation shall utilize the fastest device to compute the incident energy for the corresponding location.

Arc Flash calculations shall be based on actual overcurrent protective device clearing time. Maximum clearing time will be capped at 2 seconds based on IEEE Std. 1584-2002 section B.1.2. Where it is not physically possible to move outside of the flash protection boundary in less than 2 seconds during an arc flash event, a maximum clearing time based on the specific location shall be utilized.

2.05 REPORT SECTIONS

Input data shall include, but not be limited to the following:

Feeder input data including feeder type (cable or bus), size, length, number per phase, conduit type (magnetic or non-magnetic) and conductor material (copper or aluminum).

Transformer input data, including winding connections, secondary neutral-ground connection, primary and secondary voltage ratings, kVA rating, impedance, % taps and phase shift.

Reactor data, including voltage rating, and impedance.

Generation contribution data, (synchronous generators and Utility), including short-circuit reactance (X"d), rated MVA, rated voltage, three-phase and single line-ground contribution (for Utility sources) and X/R ratio.

Motor contribution data (induction motors and synchronous motors), including short-circuit reactance, rated horsepower or kVA, rated voltage, and X/R ratio.

Short-Circuit Output Data shall include, but not be limited to the following reports:

Low Voltage Fault Report shall include a section for three-phase and unbalanced fault calculations and shall show the following information for each applicable location:

Voltage

Calculated fault current magnitude and angle

Fault point X/R ratio

Equivalent impedance

Momentary Duty Report shall include a section for three-phase and unbalanced fault calculations and shall show the following information for each applicable location:

Voltage

Calculated symmetrical fault current magnitude and angle

Fault point X/R ratio

Calculated asymmetrical fault currents

Based on fault point X/R ratio

Based on calculated symmetrical value multiplied by 1.6

Based on calculated symmetrical value multiplied by 2.7

Equivalent impedance

Interrupting Duty Report shall include a section for three-phase and unbalanced fault calculations and shall show the following information for each applicable location:

Voltage

Calculated symmetrical fault current magnitude and angle

Fault point X/R ratio

No AC Decrement (NACD) Ratio

Equivalent impedance

Multiplying factors for 2, 3, 5 and 8 cycle circuit breakers rated on a symmetrical basis

Multiplying factors for 2, 3, 5 and 8 cycle circuit breakers rated on a total basis

Recommended Protective Device Settings:

Phase and Ground Relays:

Current transformer ratio

Current setting

Time setting

Instantaneous setting

Recommendations on improved relaying systems, if applicable.

Circuit Breakers:

Adjustable pickups and time delays (long time, short time, ground)

Adjustable time-current characteristic

Adjustable instantaneous pickup

Recommendations on improved trip systems, if applicable.

Incident energy and flash protection boundary calculations

Arcing fault magnitude

Protective device clearing time

Duration of arc

Arc flash boundary

Working distance

Incident energy

Hazard Risk Category

Recommendations for arc flash energy reduction

PART 3 EXECUTION

3.01 ARC FLASH WARNING LABELS

The contractor of the Arc Flash Hazard Analysis shall provide a thermal transfer type label of high adhesion polyester for each work location analyzed.

All labels will be based on recommended overcurrent device settings and will be provided after the results of the analysis have been presented to the owner and after any system changes, upgrades or modifications have been incorporated in the system.

The label shall include the following information, at a minimum:

Location designation

Nominal voltage

Flash protection boundary

Include necessary PPE for as required by incident energy

Areas below 40 Calcm2 shall be indicate WARNING with orange background with black font.

Areas greater than 40 Calcm2 shall be indicate DANGER with red background with white font.

Hazard risk category (Note that Per 2015 NFPA 130.5 D you cannot have both Incident Energy and Hazard Risk Category on the same label.)

Working distance

Shock Protection Boundaries Per 2015 NFPA 70E

Engineering report number, revision number and issue date.

Labels shall be machine printed, with no field markings.

Arc flash labels shall be provided in the following manner and all labels shall be based on recommended overcurrent device settings.

For each 600, 480 and applicable 208 volt panelboard, one arc flash label per panelboard section shall be provided.

For each motor control center, one arc flash label per section shall be provided.

For each low voltage switchboard, one arc flash label per section shall be provided.

For each switch gear, one flash label per section shall be provided.

For medium voltage switches one arc flash label per section shall be provided

For each machine control panel, one arc flash label per section shall be provided.

For each horizontal bus duct, one hanging arc flash label 8.5"x 5.5" shall be provided every 30'.

For each vertical bus duct, one arc flash label 4"x4" for each bus plug shall be provided.

All labels shall be field installed by the contractor performing the engineering analysis.

3.02 ARC FLASH TRAINING

The contractor of the Arc Flash Hazard Analysis shall train the owner's qualified electrical personnel of the potential arc flash hazards associated with working on energized equipment (minimum of 4 hours), on site. The training shall be certified for continuing education units (CEUs) by the International Association for Continuing Education Training (IACET) or equivalent.







***************************************THIS IS A 100% SDVOSB SET-ASIDE.*********************************************************

This procurement is 100% set-aside for Service Disabled Veteran Owned Small Business in accordance with Public Law 109-461 as codified by 38 USC 8127 & 8128. The offeror shall submit proof from Department of Veterans Affairs (VA) Center for Veteran's Enterprise (CVE) that they are either Verified as an SDVOSB, or have applied for Verification in accordance with VAAR 804.1102.

There is no estimate for a construction range, as this is merely an analysis. Site location for this project is the Canandaigua VAMC 400 Fort Hill Ave., Canandaigua, NY 14424.



THIS IS A SOURCES SOUGHT NOTICE. Please send all SF-330's electronically to Emily.Lindsey2@va.gov by May 29, 2015 at 9:00AM EDT. The preferred area of consideration is within 300 commuting miles, although all SF-330's will be accepted. SCORING WILL BE BASED UPON THE ATTACHED SCORE SHEET.



The point of contact for this procurement is Emily Lindsey, Contract Specialist, and can be reached via email at Emily.Lindsey2@va.gov.