FINAL COORDINATION STUDY -- 12-17-19.pdf

Contego Environmental LLC 433 Harrison Avenue Panama City, Florida 34201

Project: 621-16-105 - Implementation of Electrical Infrastructure Upgrades - Phase 2

Mountain Home VA Medical Center Mountain Home, Tennessee 37684

Final Stamped coordination study SPEC SECTION: SUBMITTAL MANAGER: W. David Warden (Contego

Environmental, LLC)

STATUS: Open DATE CREATED: 12/13/2019

ISSUE DATE: 12/13/2019 REVISION: 0

RESPONSIBLE

CONTRACTOR:

Kingsport Armature & Electric Co., Inc RECEIVED FROM: Paul Haun

RECEIVED DATE: SUBMIT BY:

FINAL DUE DATE: 12/27/2019 LOCATION:

SUB JOB: COST CODE:

LEAD TIME: TYPE: Document

APPROVERS: David Billings (VAMC - VISN 9 Mountain Home VA Healthcare System - James H. Quillen VA Healthcare System - Mountain Home, TN), Chad Fralick (Akea Design, Inc.)

BALL IN COURT:

David Billings (VAMC - VISN 9 Mountain Home VA Healthca), Chad Fralick (Akea Design, Inc.)

DISTRIBUTION:

Paul Haun (Kingsport Armature & Electric Co., Inc) , Marcus Demetrikopolous (Contego Environmental, LLC)

DESCRIPTION:

Please see attached for Final Stamped Coordination Study that was revised based on comments to the previous submittal. Thanks

ATTACHMENTS:

VAMC - Mountain Home Power System Study Final stamped.pdf

SUBMITTAL WORKFLOW

NAME SUBMITTER/

APPROVER SENT DATE DUE DATE RETURNED

DATE RESPONSE ATTACHMENTS COMMENTS

David Billings Approver 12/13/2019 12/27/2019 Pending

Chad Fralick Approver 12/13/2019 12/27/2019 Pending

BY DATE COPIES TO

Contego Environmental LLC Page 1 of 1 Printed On: 12/17/2019 11:32 AM

Submittal #69.0 https://app.procore.com/357156/project/submittal_logs/document_downloader?attachment_id=2175305463&item_id=19496812&item_type=SubmittalLog

Electrical Engineering Services & Systems 9400 Globe Center Dr.

Suite 121 Morrisville, NC 27560

(678) 656-8380

GENERAL ORDER NUMBER: GOELV9090

REPORT NUMBER: TQSIELV9090.1

SUBMITTED BY: J. HENRY

www.EatonElectrical.com

SHORT-CIRCUIT, PROTECTIVE DEVICE

COORDINATION, AC ARC FLASH INCIDENT

ENERGY ANALYSIS

FOR

VA MEDICAL CENTER

INFRASTRUCTURE UPGRADES

MOUNTAIN HOME, TN

FINAL

DECEMBER 2019

This item has been digitally signed and sealed by James E. Henry, PE on the date adjacent to the seal.

Printed copies of this document are not considered signed and sealed, and the signature must be verified on any electronic copies.

VAMC - Mountain Home i

REVISION HISTORY

Rev # General Order

Number Issued Revision / Modification Description

- TQSIELV9090.1 08/2019 Initial Study Report Issue TQSIELV9090.1 12/2019 Final Study Report Issue

VAMC - Mountain Home ii

TABLE OF CONTENTS

EXECUTIVE SUMMARY ....................................................................................... 1-1

SHORT-CIRCUIT ANALYSIS................................................................................ 2-1

PROTECTIVE DEVICE COORDINATION STUDY ................................................ 3-1

RECOMMENDED PROTECTIVE DEVICE SETTINGS.......................................... 4-1

ARC FLASH INCIDENT ENERGY ANALYSIS ..................................................... 5-1

SYSTEM DATA ..................................................................................................... 6-1

SHORT-CIRCUIT INPUT REPORT ....................................................................... 7-1

SHORT-CIRCUIT RESULTS ................................................................................. 8-1

UTILITY DATA ...................................................................................................... 9-1

APPLICABLE CODES AND STANDARDS ........................................................ 10-1

ONE-LINE DIAGRAM INDEX .............................................................................. 11-1

VAMC - Mountain Home 1-1

EXECUTIVE SUMMARY

This summary report contains the results of analyses performed on the electrical distribution system for the VA Medical Center facility in Mountain Home, TN. The purpose of this study is to evaluate new electrical equipment provided for this facility.

and portions of the existing electrical system. System data and necessary modeling assumptions are provided under Section 6.0.

1. Short-Circuit Analysis

Perform a short-circuit study on the electrical distribution system shown in order to determine the available fault current at pertinent locations throughout the distribution system. The scope of the study includes:

The analysis included the main 15 kV switchgear, the B208 Switchgear, the two

(2) new MV pad mount Switches, the new 208V transformer for the Building 42 and 43 ATS feeds, the three (3) new enclosed low-voltage breakers, and the new low-voltage panel for Building 115

The available fault currents determined by the short-circuit study will be used in the electrical distribution analyses.

2. Equipment Evaluation

Evaluate the short-circuit ratings of new and existing protective devices and other distribution equipment supplied by Eaton under this contract.

3. Coordination Study

Develop time-current coordination plots to derive coordinated settings for new protective devices.

Review the existing system overcurrent protection and coordination. Where applicable, provide suggestions for improvement.

4. Arc Flash Analysis

Perform an arc flash incident energy analysis per NFPA 70E on the electrical distribution system as per Eaton’s scope of work.

An incident energy analysis is defined by NFPA 70E to be a component of an arc flash risk assessment used to predict the incident energy of an arc flash for a specified set of conditions.

5. Recommendations

Provide specific recommendations for improving the electrical distribution system performance and correcting any deficiencies found by the studies.

VAMC - Mountain Home 1-2

1. Short-Circuit Study

Cases for multiple operation scenarios are evaluated. See Section 2.0, Section 7.0, and Section 8.0 for more information.

2. Equipment Evaluation

The Equipment Evaluation is based on the power system worst-case short-circuit current configuration. The short-circuit ratings of protective devices and other distribution equipment are evaluated in Section 2.0.

In summary of Table 2.1 through Table 2.6, all equipment included in this study has passed the equipment evaluation.

The short-circuit withstand ratings of low voltage disconnect switches are not evaluated in this study. Care should be taken in order to ensure that these devices are applied within their UL listed short-circuit withstand ratings. The typical withstand ratings for Eaton disconnect switches (safety switches) range from 10,000A to 200,000A for certain fused types.

See Section 2.0 for detailed analysis and evaluation results.

3. Coordination Study

The time-current coordination plots of the protective overcurrent devices are shown in Section 3.0. In developing the device settings, consideration was given to the isolation of faults, protection of cables, and protection of transformers.

Efforts were made to provide the best coordination possible with the protective devices supplied under this contract and existing protective devices. It should be understood that selective coordination between two instantaneous trip units cannot be achieved for fault levels above the instantaneous pickup of the upstream device.

There is some overlapping of curves that cannot be avoided.

The phase pickup settings for most relays were lowered to better coordinate with the utility relays, while still coordination with the downstream substation primary fuses.

The ground pickup settings were lowered significantly to allow coordination with the utility ground relays where possible, and to try and coordinate with the Building 208 relays which are now in series in the primary circuits when using Building 208 as a feed-thru mode.

There are several locations where the MV transformer primary fuses contained in the SKM model received from the Customer do not clear the respective transformer inrush point (assuming 12X inrush factor).

In summary of the coordination study, the following recommended changes would maximize coordination while maintaining adequate protection:

Feeder 1:

Relay CIRC 1: Lower 51P1P from 7.5 to 6

Lower 50P1P from 100 to 60

Lower 51N1P from 10 to 6

VAMC - Mountain Home 1-3

Raise 51N1TD from 1 to 2

Feeder 3:

Relay CIRC 3: Lower 51P1P from 14 to 6

Raise 51P1TD from 2 to 3.5

Lower 50P1P from 100 to 85

Lower 51N1P from 15 to 7.5

Raise 51N1TD from 0.5 to 3

Feeder 4:

Relay CIRC 4: Lower 51P1TD from 4 to 3

Lower 50P1P from 100 to 70

Lower 51N1P from 15 to 6

Raise 51N1TD from 1 to 2

Feeder 5:

Relay CIRC 5: Lower 51P1P from 14 to 6

Raise 51P1TD from 2 to 5

Lower 50P1P from 100 to 65

Lower 51N1P from 15 to 6

Raise 51N1TD from 0.5 to 2

Feeder 6:

Relay CIRC 6: Lower 51P1P from 14 to 6

Raise 51P1TD from 2 to 5

Lower 50P1P from 100 to 65

Lower 51N1P from 15 to 6

Raise 51N1TD from 0.5 to 2

Feeder 7:

Relay CIRC 7: Lower 51N1P from 10 to 4.5

Raise 51N1TD from 0.8 to 4

Feeder 8:

Relay CIRC 8: Lower 50P1P from 75 to 50

Lower 51N1P from 10 to 4

Raise 51N1TD from 1 to 4

Building 115 Main1:

Relay B115 MAIN1: Turn off 50P1P element

Lower 51P1TD from 3.3 to 2.6

VAMC - Mountain Home 1-4

Lower 51G1P from 5 to 2.5

Raise 51G1TD from 4 to 4.3

Request that the utility raise the settings for the B254 relay ground pickup from 180A to 240A, and raise the time dial to 0.4. It is suggested that the utility B254 relay INST setting be raised to 5040 amps for better coordination. The settings received from BrightRidge for the B254 ground relay settings, listed the ground INST settings was 12,600 amps. But according to the manufacturer documentation, the maximum INST setting that can be obtained with a 180A pickup is 5,580 amps. This value will still coordinate with the revised settings.

Building 115 Main2:

Relay B115 MAIN2:

Lower 51G1P from 5 to 2.4

Raise 51G1TD from 4 to 4.5

Request that the utility raise the settings for the B214 relay ground time dial from 2.5 to 3.3. The newly installed Intellirupter was assumed to be controlled by a SEL-351R relay, as that information was not provided. Coordination cannot be achieved with the Intellirupter. It may be unlikely that the utility will change settings for this device, as this is installed on the Alternate circuit. Possible changes to this device would be to raise the pickup. It was also not known if this is a directional device. The ground settings for the Intellirupter cannot be coordinated with. It is recommended to meet with the utility and show the utility the TCC’s for this circuit to see if they can make any improvements. Possible changes to the Intellirupter can be seen on Page 3-28- Rec in the Section 3.0 of this report.

Building 208 Main:

Relay B208 Main: Raise 51P Pickup from 5 to 6

Raise 51P Time Dial from 1.5 to 4.6

Lower the 50P Pickup from 10 to 8.4

Raise the 51N Pickup from 1 to 2.5

Change curve shape to Extremely Inverse

Raise the 51N Time Dial from 2 to 5.2

Relay B115 FDR (52-F1): Change the curve shape to Extremely Inverse

Raise 51P Pickup from 7.5 to 8.5

Lower 51P Time Dial from 10 to 4.6

Raise the 51N Pickup from 2 to 4

Change curve shape to Extremely Inverse

Raise the 51N Time Dial from 4 to 4.2

The above changes are a result of trying to obtain coordination when the utility Primary and Alternate incoming feeds go through Building 208. The settings had to be revised to coordinate with the Building 115 main relays.

VAMC - Mountain Home 1-5

All of the adjustable medium voltage relays should be tested and adjusted according to the recommended settings given in Section 4.0.

4. Protective Device Settings

Settings for the protective devices supplied by Eaton should be set as shown and recommended in Section 4.0.

Each entry references a coordination plot number found in Section 3.0. The referenced plot illustrates the coordination of the listed device with the relevant “upstream” and “downstream” protective devices.

5. Arc Flash Incident Energy Analysis

Details of the arc flash incident energy analysis are shown in Section 5.0. Please note for this study, the arc flash hazard has been calculated by performing an incident energy analysis. The results of this study can be used by qualified workers to determine the arc flash boundary and select appropriate arc flash PPE as part of an overall arc flash risk assessment. NFPA 70E Table 130.5(g) provides guidance on the selection of arc rated clothing and other PPE based on the results of an incident energy analysis. It is the responsibility of the employer and qualified person(s) to conduct an overall arc flash risk assessment as detailed in NFPA 70E- 2018 Article 130.5 before the commencement of work on electrical equipment. The risk associated with performing energized electrical work will vary based on the work being performed as well as the condition of the equipment and other factors that can be best determined by a qualified person in the field.

The PPE requirements outlined in NFPA 70E only address the thermal hazards associated with arc flash events and do not provide protection against other possible physical trauma resulting from an arc flash event. See NFPA 70E Article 120 for details on establishing an electrically safe work condition.

a) Expanded Arc Flash Incident Energy Analysis:

It is recommended the scope of this study be expanded to include a complete system wide arc flash incident energy analysis of all equipment. The existing SKM system model received for this facility is incomplete, and has incomplete data for portions of the system. The results of the arc flash incident energy analysis are used to determine the incident energy, arc flash boundary, and personal protective equipment requirements for each location. The arc flash incident energy analysis is required by NFPA 70E as part of an arc flash risk assessment, and is required by OSHA through the general duty clause.

NFPA 70E requires that the arc flash analysis be updated:

Every five years (at minimum)

When the electrical system is modified, including renovations, additions, or subtractions to the system

6. Testing and Preventative Maintenance

The 2018 edition of NFPA 70E Section 205.3 and 205.4 requires that regularly scheduled testing and preventative maintenance be performed to ensure that the

VAMC - Mountain Home 1-6 electrical distribution equipment continues to perform at an optimum level. Testing should entail primary injection testing of all circuit breakers to verify proper tripping ranges, contact resistance testing, insulation resistance testing and complete switchgear and transformer cleaning and inspection. Refer to NFPA-70B for specific types of testing and interval recommendations. The industry generally performs breaker testing every 3-5 years.

7. Additional Recommendations

While performing the analysis for this project, using the Customer provided SKM model created by others, there is a significant amount of low-voltage equipment that reports as overdutied. None of the previous studies provided performed any equipment evaluation, only coordination and/or arc flash analysis. It is pointed out here that arc flash labels should not be provided for equipment that is overdutied. If the equipment is overdutied, it may not have the ability to clear the fault, therefore making any incident energy calculations invalid.

VAMC - Mountain Home 2-1

SHORT-CIRCUIT ANALYSIS

The short-circuit study determines the fault currents that flow in the system during various fault conditions. An existing SKM system model was received from the VAMC to use for this analysis. The calculated fault currents are used in the device evaluation and coordination studies. See Section 7.0 and Section 8.0 for the computer generated input data and output data. NEC-2017, Article 110.24(A) requires that service entrance equipment is labeled with the following pieces of information:

Maximum available fault current

Date on which the fault current was calculated

Article 110.24(B) adds that if there is a modification that may change this fault current value, it must be recalculated. The field marking must be updated to reflect the new value of maximum fault current.

Separate “Z” (complex), “X” (reactive), and "R" (resistive) networks are used for the short-circuit analysis. Complex network reduction and the relationship E/Z are used to calculate the fault current magnitude and angle at each faulted bus. The complex equivalent circuit impedance, Z, is calculated by the reduction of the “Z” (complex) network. The X/R ratios calculated for each fault condition are based on the separate reduction of the X and R networks. These X/R ratios are used for the calculation of fault duty multipliers, to evaluate the short-circuit ratings of system components.

The software is capable of generating three types of short-circuit reports for both balanced (three-phase bolted) and unbalanced (line-to-ground) faults. The reports that are generated depend on the system that is being evaluated.

The three types of short-circuit reports are:

Fault Report (for low voltage)

Momentary Duty Report (for medium voltage)

Interrupting Duty Report (for medium voltage)

1. Fault Report

The fault currents reported in the “Fault Report” are applicable to low voltage devices and components. The fault currents calculated in this report are based on the contribution data derived from IEEE Std C37.13™. The fault currents are calculated as follows:

Motor and generator subtransient reactance values (Xd”) are adjusted per the first cycle duty multipliers described in IEEE Std 141™.

The complex equivalent circuit impedance, Z, is calculated by network reduction of the “Z” (complex) network.

The momentary symmetrical current = E/Z.

The X/R ratio is equal to the equivalent circuit reactance, X, divided by the equivalent circuit resistance, R. As discussed above, X is calculated by the reduction of the “X” (reactive) network and R is calculated by the reduction of the “R” (resistive) network.

VAMC - Mountain Home 2-2

Multiplying factors are determined, and used to adjust the calculated symmetrical fault current. The adjusted current is used to evaluate low voltage protective devices. Low voltage output algorithms and output reports reflect NEMA AB-1 molded case breaker de-rating multipliers. Breakers are de-rated for circuits where the power factor is lower than the NEMA test circuit (higher X/R ratio). The multipliers adjust the symmetrical fault current to the value associated with the systems fault point X/R ratio. The adjusted value listed on the report may then be compared directly with the manufacturer's published interrupting rating.

2. Momentary Duty Report

The “Momentary Duty Report” contains the calculated fault currents that occur during the first half-cycle of the fault. The momentary fault currents are used to evaluate medium and high voltage fuses, and the “closing and latching” capability (momentary rating) of medium and high voltage breakers. The fault currents reported in the “Momentary Duty Report” are calculated as follows:

Motor and generator subtransient reactance values (Xd”) are adjusted per the first cycle duty multipliers described in IEEE Std 141.

The complex equivalent circuit impedance, Z, is calculated by network reduction of the “Z” (complex) network.

The momentary symmetrical current = E/Z.

The X/R ratio reported is equal to the equivalent circuit reactance, X, divided by the equivalent circuit resistance, R. As discussed above, X is calculated by the reduction of the “X” (reactive) network and R is calculated by the reduction of the “R” (resistive) network.

The momentary asymmetrical current is calculated and reported in two different ways, once as “sym*1.6” and again as “momentary based on X/R”. The “sym*1.6” value is the momentary symmetrical current multiplied by 1.6. The “momentary based on X/R” value is the momentary symmetrical current multiplied by e

RX

3. Interrupting Duty Report

The fault currents reported in the “Interrupting Duty Report” are used to evaluate the interrupting rating of medium- and high-voltage breakers. The interrupting symmetrical current is calculated as follows:

Motor and generator subtransient reactance values (Xd”) are adjusted per the interrupting duty multipliers described in IEEE Std 141.

The complex equivalent circuit impedance, Z, is calculated by network reduction of the “Z” (complex) network.

The interrupting symmetrical current = E/Z.

The X/R ratio reported is equal to the equivalent circuit reactance, X, divided by the equivalent circuit resistance, R. As discussed above, X is calculated by the

VAMC - Mountain Home 2-3 reduction of the “X” (reactive) network and R is calculated by the reduction of the “R” (resistive) network.

The calculated X/R ratio is used to determine the minimum contact parting time multiplying factors for 2, 3, 5, and 8 cycle breakers. The multiplying factors are based on IEEE Std C37.5™ and IEEE Std C37.010™ standards. The multiplying factors are applied to the interrupting symmetrical current in order to calculate the RMS short-circuit current interrupting duty for 2, 3, 5, and 8 cycle breakers. This duty is compared to the symmetrical current interrupting rating of the circuit breaker. NACD (No AC Decrement) ratios are calculated with consideration of generator "Local" and "Remote" contributions as outlined in IEEE Std C37.010™.

Motor and generator impedance multipliers for the short-circuit calculations are summarized in the following table. This is based on the recommended combination network for comprehensive multi-voltage system calculations (from IEEE Std 141:

Machine Type Impedance

(First Cycle Duty) Impedance

(Interrupting Duty)

Turbine generators, Condensers, Hydrogenerators with amortisseur windings

1.0 Xd" 1.0 Xd"

Synchronous motors 1.0 Xd" 1.5 Xd"

Induction motors > 1000 hp at speed 1800 RPM, or > 250 hp at 3600 RPM.

1.0 Xd" 1.5 Xd"

Induction motors50 hp not covered above.

1.2 Xd" 3.0 Xd"

Induction motors < 50 hp 1.67 Xd" Neglect

Note: Xd" is the subtransient reactance of the rotating machine.

The objective of the short-circuit analysis is to calculate the maximum short-circuit currents produced by balanced three-phase and unbalanced faults at each bus shown on the one-line diagrams.

1. Short-Circuit System Model

The system was modeled for worst-case fault currents. Short-circuit currents were calculated for a three-phase bolted fault and single-line-to-ground fault at each bus shown on the study one-line diagrams.

a) Evaluated Short-Circuit Cases:

The following short-circuit study cases were evaluated:

VAMC - Mountain Home 2-4

Study Case No. 1 – Campus fed from primary JCPB via new MV switchgear (supplied through B208).

Study Case No. 2 – Campus fed from primary JCPB via new MV switchgear (not supplied through B208).

Study Case No. 3 – Campus fed from alternate JCPB via new MV switchgear (supplied through B208).

Study Case No. 4 – Campus fed from alternate JCPB via new MV switchgear (not supplied through B208).

Study Case No. 5 - Campus fed from alternate JCPB via Alternate main breaker in B115 – not via new MV switchgear.

Study Case No. 6 - Campus fed from primary JCPB, through B208, with B208 generators on grid-tie configuration.

The purpose of the equipment evaluation is to compare the maximum calculated short-circuit currents to the short-circuit ratings of protective devices. The comparison is made in order to determine if the device can interrupt or withstand the available fault currents of the electrical system to which the device is applied, as required by NEC Articles 110.9 and 110.10. The device evaluation follows the evaluation procedures outlined in IEEE Std C37.13, IEEE Std C37.010, IEEE Std C37.5, IEEE Std C37.41™, IEEE Std 1015™, and applicable ANSI, NEMA, and UL standards.

The results of the short-circuit equipment evaluation are summarized in Table 2.1 through Table 2.6. The tables indicate “Bus I.D.” (corresponds to bus designations used in the one-line diagrams, “Manufacturer”, “Status” (Pass, fail, unknown, or marginal), “Type” (equipment category), “Equip Volts”, calculated short-circuit duty, the equipment short-circuit rating, the series rating (if applicable), and the maximum duty rating.

The maximum duty rating is calculated by:

RatingCDeviceS dutyCS

If the short-circuit rating of a device is not known, and/or short-circuit rating information is not available, a Minimum Required short-circuit rating is listed. For equipment with series ratings, the maximum duty rating is calculated using the series rating instead of the individual device short-circuit rating. All short-circuit current values are reported in units of kA.

1. For low voltage devices:

The calculated short-circuit duty is reported under “Calc Isc (kA)" and the device short-circuit rating is reported under "Equip Isc (kA)". The calculated duty has been adjusted accordingly per the system X/R and device test X/R.

VAMC - Mountain Home 2-5

2. For medium/high voltage breakers:

The calculated interrupting short-circuit duty is reported under "Calc Isc (kA)" and the breaker short-circuit interrupting rating is reported under "Equip Isc (kA)". The interrupting duty has been adjusted per multiplying factors based on the breaker clearing time and system X/R. The calculated momentary duty (i.e. close-and-latch duty) is reported under "Calc Mom (kA)". The breaker momentary (i.e. close-and-latch) rating is reported under "Equip Msc (kA)".

3. For medium/high voltage fuses, switches, and motor starters:

The calculated momentary symmetrical short-circuit duty is reported under "Calc Isc (kA)" and the device's momentary symmetrical short-circuit rating is reported under "Equip Isc (kA)". The calculated momentary asymmetrical duty is reported under "Calc Mom (kA)". The device's momentary asymmetrical short-circuit rating is reported under "Equip Mom (kA)".

Information used in modeling the power system to provide conservative, worst-case results is listed in Section 6.0. The results of the short-circuit analysis, including calculated branch contributions, are provided under Section 8.0. The one-line diagrams with referenced bus identification are included in Section 11.0.

VAMC - Mountain Home 2-6

Table 2.1 – Equipment Evaluation – Study Case No. 1

Bus I.D. Manufacturer Status Type Bus Voltage (V) Calc Isc (kA)

Equip Isc (kA)

Isc Rating %

Calc Mom (kA)

Equip Mom (kA)

Mom Rating %

115 SWGR-A SIEMENS Passed MV Switchgear 12470 5.94 21.65 (*N2) 27.45 7.05 37.00 19.06

115 SWGR-B SIEMENS Passed MV Switchgear 12470 5.94 21.65 (*N2) 27.45 7.05 37.00 19.06

42-0-A SIEMENS Passed LV Panelboard 208 5.73 10.00 57.26

42-0-B Passed LV Panelboard 208 4.52 10.00 45.20

43-0-A Passed LV Panelboard 208 4.27 10.00 42.73

BLDG 208 BUS Passed 12470 7.60 18.00 42.22 8.83 37.00 23.86

BLDG 208 EM BUS Passed 12470 2.79 18.00 15.55 4.46 37.00 12.05

BLDG 42-ATS' ASCO Passed LV ATS 208 9.03 35.00 25.80

BLDG 43-ATS' ASCO Passed LV ATS 208 9.03 35.00 25.80

ECB-BLDG 115 Passed LV Enclosed Breaker 208 11.10 65.00 17.08

ECB-BLDG-42 Passed LV Enclosed Breaker 208 11.10 65.00 17.08

ECB-BLDG-43 Passed LV Enclosed Breaker 208 11.10 65.00 17.08

MV SW 1 S&C Passed MV Switchgear 12470 8.12 12.50 64.95 9.33 20.00 46.66

MV SW 2 S&C Passed MV Switchgear 12470 6.80 12.50 54.42 7.90 20.00 39.50

PNL B115 EATON Passed LV Panelboard 208 4.92 10.00 49.24

(*N2) Dev Isc kA modified based on Max Rating Voltage and K Factor.

VAMC - Mountain Home 2-7

Table 2.2 – Equipment Evaluation - Study Case No. 2

Bus I.D. Manufacturer Status Type Bus Voltage (V) Calc Isc (kA)

Equip Isc (kA)

Isc Rating %

Calc Mom (kA)

Equip Mom (kA)

Mom Rating %

115 SWGR-A SIEMENS Passed MV Switchgear 12470 6.61 21.65 (*N2) 30.53 8.12 37.00 21.95

115 SWGR-B SIEMENS Passed MV Switchgear 12470 6.61 21.65 (*N2) 30.53 8.12 37.00 21.95

42-0-A SIEMENS Passed LV Panelboard 208 5.73 10.00 57.34

42-0-B Passed LV Panelboard 208 4.53 10.00 45.25

43-0-A Passed LV Panelboard 208 4.28 10.00 42.78

BLDG 208 BUS Passed 12470 7.60 18.00 42.22 8.83 37.00 23.86

BLDG 208 EM BUS Passed 12470 2.79 18.00 15.55 4.46 37.00 12.05

BLDG 42-ATS' ASCO Passed LV ATS 208 9.05 35.00 25.86

BLDG 43-ATS' ASCO Passed LV ATS 208 9.05 35.00 25.86

ECB-BLDG 115 Passed LV Enclosed Breaker 208 11.13 65.00 17.12

ECB-BLDG-42 Passed LV Enclosed Breaker 208 11.13 65.00 17.12

ECB-BLDG-43 Passed LV Enclosed Breaker 208 11.13 65.00 17.12

MV SW 1 S&C Passed MV Switchgear 12470 8.12 12.50 64.95 9.33 20.00 46.67

MV SW 2 S&C Passed MV Switchgear 12470 8.10 12.50 64.79 9.31 20.00 46.57

PNL B115 EATON Passed LV Panelboard 208 4.93 10.00 49.30

VAMC - Mountain Home 2-8

Table 2.3 – Equipment Evaluation - Study Case No. 3

Bus I.D. Manufacturer Status Type Bus Voltage (V) Calc Isc (kA)

Equip Isc (kA)

Isc Rating %

Calc Mom (kA)

Equip Mom (kA)

Mom Rating %

115 SWGR-A SIEMENS Passed MV Switchgear 12470 3.60 21.65 (*N2) 16.62 4.34 37.00 11.74

115 SWGR-B SIEMENS Passed MV Switchgear 12470 3.60 21.65 (*N2) 16.62 4.34 37.00 11.74

42-0-A SIEMENS Passed LV Panelboard 208 5.68 10.00 56.83

42-0-B Passed LV Panelboard 208 4.50 10.00 44.95

43-0-A Passed LV Panelboard 208 4.25 10.00 42.51

BLDG 208 BUS Passed 12470 3.96 18.00 21.05 4.92 37.00 13.30

BLDG 208 EM BUS Passed 12470 2.79 18.00 15.55 4.46 37.00 12.05

BLDG 42-ATS' ASCO Passed LV ATS 208 8.91 35.00 25.46

BLDG 43-ATS' ASCO Passed LV ATS 208 8.91 35.00 25.46

ECB-BLDG 115 Passed LV Enclosed Breaker 208 10.92 65.00 16.80

ECB-BLDG-42 Passed LV Enclosed Breaker 208 10.92 65.00 16.80

ECB-BLDG-43 Passed LV Enclosed Breaker 208 10.92 65.00 16.80

MV SW 1 S&C Passed MV Switchgear 12470 4.05 12.50 32.37 5.07 20.00 25.34

MV SW 2 S&C Passed MV Switchgear 12470 3.79 12.50 30.30 4.64 20.00 23.18

PNL B115 EATON Passed LV Panelboard 208 4.89 10.00 48.91

VAMC - Mountain Home 2-9

Table 2.4 – Equipment Evaluation - Study Case No. 4

Bus I.D. Manufacturer Status Type Bus Voltage (V) Calc Isc (kA)

Equip Isc (kA)

Isc Rating %

Calc Mom (kA)

Equip Mom (kA)

Mom Rating %

115 SWGR-A SIEMENS Passed MV Switchgear 12470 3.83 21.65 (*N2) 17.68 4.71 37.00 12.73

115 SWGR-B SIEMENS Passed MV Switchgear 12470 3.83 21.65 (*N2) 17.68 4.71 37.00 12.73

42-0-A SIEMENS Passed LV Panelboard 208 5.69 10.00 56.91

42-0-B Passed LV Panelboard 208 4.50 10.00 45.00

43-0-A Passed LV Panelboard 208 4.25 10.00 42.55

BLDG 208 BUS Passed 12470 3.96 18.00 22.00 4.91 37.00 13.27

BLDG 208 EM BUS Passed 12470 2.79 18.00 15.55 4.46 37.00 12.05

BLDG 42-ATS' ASCO Passed LV ATS 208 8.93 35.00 25.52

BLDG 43-ATS' ASCO Passed LV ATS 208 8.93 35.00 25.52

ECB-BLDG 115 Passed LV Enclosed Breaker 208 10.95 65.00 16.84

ECB-BLDG-42 Passed LV Enclosed Breaker 208 10.95 65.00 16.84

ECB-BLDG-43 Passed LV Enclosed Breaker 208 10.95 65.00 16.84

MV SW 1 S&C Passed MV Switchgear 12470 4.05 12.50 32.37 5.07 20.00 25.34

MV SW 2 S&C Passed MV Switchgear 12470 4.04 12.50 32.34 5.06 20.00 25.32

PNL B115 EATON Passed LV Panelboard 208 4.90 10.00 48.97

VAMC - Mountain Home 2-10

Table 2.5 – Equipment Evaluation - Study Case No. 5

Bus I.D. Manufacturer Status Type Bus Voltage (V) Calc Isc (kA)

Equip Isc (kA)

Isc Rating %

Calc Mom (kA)

Equip Mom (kA)

Mom Rating %

115 SWGR-A SIEMENS Passed MV Switchgear 12470 4.20 21.65 (*N2) 19.40 5.34 37.00 14.44

115 SWGR-B SIEMENS Passed MV Switchgear 12470 4.20 21.65 (*N2) 19.40 5.34 37.00 14.44

42-0-A SIEMENS Passed LV Panelboard 208 5.70 10.00 57.01

42-0-B Passed LV Panelboard 208 4.51 10.00 45.06

43-0-A Passed LV Panelboard 208 4.26 10.00 42.61

BLDG 208 BUS Unknown 12470 3.95 18.00 21.94 4.88 37.00 13.19

BLDG 208 EM BUS Unknown 12470 2.79 18.00 15.55 4.46 37.00 12.05

BLDG 42-ATS' ASCO Passed LV ATS 208 8.96 35.00 25.59

BLDG 43-ATS' ASCO Passed LV ATS 208 8.96 35.00 25.59

ECB-BLDG 115 Passed LV Enclosed Breaker 208 10.99 65.00 16.90

ECB-BLDG-42 Passed LV Enclosed Breaker 208 10.99 65.00 16.90

ECB-BLDG-43 Passed LV Enclosed Breaker 208 10.99 65.00 16.90

MV SW 1 S&C Passed MV Switchgear 12470 4.04 12.50 32.32 5.04 20.00 25.18

MV SW 2 S&C Passed MV Switchgear 12470 3.77 12.50 30.20 4.57 20.00 22.84

PNL B115 EATON Passed LV Panelboard 208 4.91 10.00 49.05

VAMC - Mountain Home 2-11

Table 2.6 – Equipment Evaluation - Study Case No. 6

Bus I.D. Manufacturer Status Type Bus Voltage (V) Calc Isc (kA)

Equip Isc (kA)

Isc Rating %

Calc Mom (kA)

Equip Mom (kA)

Mom Rating %

115 SWGR-A SIEMENS Passed MV Switchgear 12470 7.63 21.65 (*N2) 35.22 9.63 37.00 26.02

115 SWGR-B SIEMENS Passed MV Switchgear 12470 7.63 21.65 (*N2) 35.22 9.63 37.00 26.02

42-0-A SIEMENS Passed LV Panelboard 208 5.74 10.00 57.42

42-0-B Passed LV Panelboard 208 4.53 10.00 45.29

43-0-A Passed LV Panelboard 208 4.28 10.00 42.81

BLDG 208 BUS Unknown 12470 10.19 18.00 56.61 14.51 37.00 39.22

BLDG 208 EM BUS Unknown 12470 10.18 18.00 56.56 14.50 37.00 39.19

BLDG 42-ATS' ASCO Passed LV ATS 208 9.07 35.00 25.93

BLDG 43-ATS' ASCO Passed LV ATS 208 9.07 35.00 25.93

ECB-BLDG 115 Passed LV Enclosed Breaker 208 11.17 65.00 17.18

ECB-BLDG-42 Passed LV Enclosed Breaker 208 11.17 65.00 17.18

ECB-BLDG-43 Passed LV Enclosed Breaker 208 11.17 65.00 17.18

MV SW 1 S&C Passed MV Switchgear 12470 10.63 12.50 85.07 14.59 20.00 72.96

MV SW 2 S&C Passed MV Switchgear 12470 8.85 12.50 70.79 11.46 20.00 57.28

PNL B115 EATON Passed LV Panelboard 208 4.94 10.00 49.35

VAMC - Mountain Home 3-1

PROTECTIVE DEVICE COORDINATION STUDY

The protective device coordination study determines overcurrent protective relay and circuit breaker settings in order to provide an optimal compromise between protection and selectivity.

Using the appropriate maximum fault currents, the time-current coordination curves were plotted as operating time versus current magnitudes to show protective device tripping and/or clearing characteristics and coordination among these devices.

Consideration was given to provide both selective isolation of faults and maximum protection of equipment such as cables, transformers, motors, etc.

To achieve the optimum protection and selectivity, the following guidelines were followed throughout the study:

1. Ideally, the settings of any overcurrent device should be high enough to permit the continuous full-load operating capacity of the cables and the equipment they supply, and to ride through system temporary disturbances such as in-rush current. On the other hand, the settings should be low enough to provide overload and short-circuit protection under minimum fault conditions.

2. Considering any two protective devices in series:

The maximum available fault current at the downstream device determines the upper limit of the coordination range between these two devices.

The minimum available fault current at the downstream device or the pick-up setting of the upstream device determines the lower limit of the coordination range.

Series instantaneous devices do not coordinate unless there is sufficient impedance between the two devices.

When plotting coordination curves, certain time intervals must be maintained between the curves in order to ensure correct selectivity. These time intervals vary, depending on the device types. In general, however, the following must be taken into consideration when determining the appropriate time separation interval: Breaker clearing time, relay tolerances, induction disk over-travel, and a reasonable safety margin for error.

Protective device coordination was performed in accordance with IEEE Std 242™.

Minimum guidelines for equipment protection, as outlined in the National Electrical Code (NEC) and applicable standards of the American National Standards Institute (ANSI), were followed.

Applicable requirements are summarized below.

1. Cables

Power cables require overload and short-circuit protection in order to meet the requirements stated in NEC Article 240, and IEEE Std 242. The NEC further

VAMC - Mountain Home 3-2 requires that the ampacity of low voltage cable (0-2000 Volts) be determined by NEC Article 310.15. Cable de-rating based upon ambient temperature and the number of current carrying conductors in a raceway must also be applied. Medium voltage cable (2001-35,000 Volts) ampacity is defined by NEC Articles 240.100(A) and 310.60.

2. Transformers

A transformer is recommended to have protective devices on both primary and secondary side in order to meet the basic protection requirements for overloads and short-circuit withstand values. However, a transformer is permitted to be protected by only a primary side device if it meets the exceptions listed in NEC Article 240.4(F).

In addition, the transformer protective devices must be able to withstand magnetizing inrush currents without tripping.

NEC protection requirements for transformers: Overcurrent devices should be selected, and settings should be recommended to provide overcurrent protection in accordance with NEC Article 450.3. Paragraph (A) specifies that transformers over 600 V comply with Table 450.3(A). Paragraph (B) specifies that transformers less than 600 V comply with Table 450.3(B).

Short-circuit thermal limits for transformers: The primary devices should be set on the basis that the transformers have short-circuit withstand capabilities as defined by IEEE Std C57.109™.

3. Motors

The motors should have appropriate protective devices to meet the basic protection requirements for overloads and fault current withstand values. In addition, the motor short-circuit and ground fault protective devices should be set to ride through motor starting current.

Please see Section 6.0 for a complete list of data and assumptions that were used in modeling the power system to provide conservative, worst-case results. Please note that complete information regarding the system model used for the computer simulation is included in Section 7.0.

As shown on the time-current plots, each device curve is tagged with an arrow and label referencing its location on the plot's individual representative one-line diagram.

This label also references the device to its specific manufacturer information, including ratings and settings, as indicated in the text box on each plot. The device time-current characteristics are truncated at maximum through-fault current for a downstream fault.

Efforts were made to provide the best coordination possible with the protective devices supplied under this contract and existing equipment. Areas where breaker trip curves overlap indicate areas of possible non-selective breaker operation.

Where possible, efforts were made to reduce non-selective breaker operation while maintaining adequate system protection. In some cases, because of device limitations, little can be done to improve device selectivity. Such device limitations include the fixed operating characteristic of a fuse, the built-in instantaneous or

VAMC - Mountain Home 3-3 instantaneous “over-ride” elements of molded case circuit breakers, and the limited instantaneous trip range of trip units with an instantaneous trip function.

In cases involving redundant protective devices, non-selective breaker operation is of little or no concern. Protective devices are redundant if, regardless of which device opens, the same system outage occurs. Often, in order to improve overall system protection and coordination, redundant devices are intentionally set to overlap (i.e.

non-selectively coordinate with) one another.

Adequate coordination is achieved using the recommended protective devices, with settings and ratings as listed in Section 4.0. The recommended adjustments would maximize coordination in an attempt to allow the various downstream devices to isolate faults without operation of the upstream devices. Although instantaneous trip devices provide the highest degree of protection, when applied in series they compromise selectivity at high-magnitude fault currents.

Refer to the following pages for the plotted coordination curves, which graphically indicate the degree of selectivity and protection obtained.

In some cases, a single time-current curve may be applicable to several locations in the system, where each location utilizes substantially similar devices, and serves similar loads.

The following list references the attached time-current curves for this report. A second set of curves showing the recommended changes are also included. They follow these curves and have pages numbers with a “-REC” suffix.

Table 3.1 – TCC Plots Index

Title Page Number FDR1-B204 PHASE Page 3-5

FDR1-B77A/B PHASE Page 3-6

FDR1-GROUND Page 3-7

FDR3-B201 PHASE Page 3-8

FDR3-B205 PHASE Page 3-9

FDR3-GROUND Page 3-10

FDR4-B200 PHASE Page 3-11

FDR4-GROUND Page 3-12

FDR5-B160 PHASE Page 3-13

FDR5-GROUND Page 3-14

FDR6-B160 PHASE Page 3-15

FDR6-GROUND Page 3-16

VAMC - Mountain Home 3-4

Title Page Number FDR7-GROUND Page 3-17

FDR7-PHASE Page 3-18

FDR8-B116 PHASE Page 3-19

FDR8-B42/43 PHASE Page 3-20

FDR8-GROUND Page 3-21

MAIN1 B208(ALT)-

GROUND Page 3-22

MAIN1 B208(ALT)-

PHASE Page 3-23

MAIN1 B208-GROUND Page 3-24

MAIN1 B208-PHASE Page 3-25

MAIN1-GROUND Page 3-26

MAIN1-PHASE Page 3-27

MAIN2(ALT)-GROUND Page 3-28

MAIN2(ALT)-PHASE Page 3-29

RELAY CIRC 1 - Phase RELAY B115 MAIN1 - Phase

TX Inrush

XF-MSB 204 MAIN

0.5 1 10 10

1K 10 K

0.01

0.10

CURRENT IN AMPERES

TIME IN SECONDS

MSB-204-PRIM FU

CUTLER-HAMMER

20E-300E TYPE: CLE, 15.5kV E-Rated Sensor/Trip: 50A, Phase

50.0 Amps

MSB 204 MAIN CB

CUTLER-HAMMER

LSI, 200-5000A

TYPE: DS, RMS 510/610/810/910

Sensor/Trip: 1600A, Plug: 1600 AT Phase

LTPU (0.5-1.0 x P) 0.5 (800A) LTD (2-24 Sec.) 4 STPU (2-10 x LTPU) S2(10) (8000A) STD (0.1-0.5 Sec.) 0.5 Sec. (I^s T On) INST (2-12 x P) M2(12) (19200A)

RELAY CIRC 1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 7.5 (300A) U4, Extremely Inverse 4.0

50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3

50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

XF-MSB 204 MAIN

1000 kVA

12470 / 480 VMSB-204-PRIM FU

CUTLER-HAMMER

20E-300E TYPE: CLE, 15.5kV E-Rated Sensor/Trip: 50A, Phase

50.0 Amps

MSB 204 MAIN CB

CUTLER-HAMMER

LSI, 200-5000A

TYPE: DS, RMS 510/610/810/910

Sensor/Trip: 1600A, Plug: 1600 AT Phase

LTPU (0.5-1.0 x P) 0.5 (800A) LTD (2-24 Sec.) 4 STPU (2-10 x LTPU) S2(10) (8000A) STD (0.1-0.5 Sec.) 0.5 Sec. (I^s T On) INST (2-12 x P) M2(12) (19200A)

RELAY CIRC 1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 7.5 (300A) U4, Extremely Inverse 4.0

50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3

50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

XF-MSB 204 MAIN

1000 kVA 12470 / 480 V

FDR1 TOTAL

XFMR INRUSH

FDR1 TOTAL

XFMR INRUSH

Plot name: FDR1-B204 PHASE Ref. Voltage: 12470V Current Scale: x 10

MSB-204-PRIM FU

XF-MSB 204 MAIN PRI

S

P XF-MSB 204 MAIN

XF-MSB 204 MAIN SEC

MSB 204 MAIN

MSB 204 MAIN CB

MSB 204A

RELAY CIRC 1

RELAY B115 MAIN1

Eaton Electrical Services and Systems December 11, 2019

VAMC - Mountain Home 3-5

TX Inrush

XF-MSB 204 MAIN

0.5 1 10 10

1K 10 K

0.01

0.10

CURRENT IN AMPERES

TIME IN SECONDS

MSB-204-PRIM FU

CUTLER-HAMMER

20E-300E TYPE: CLE, 15.5kV E-Rated Sensor/Trip: 50A, Phase

50.0 Amps

MSB 204 MAIN CB

CUTLER-HAMMER

LSI, 200-5000A

TYPE: DS, RMS 510/610/810/910

Sensor/Trip: 1600A, Plug: 1600 AT Phase LTPU (0.5-1.0 x P) 0.5 (800A) LTD (2-24 Sec.) 4 STPU (2-10 x LTPU) S2(10) (8000A) STD (0.1-0.5 Sec.) 0.5 Sec. (I^s T On) INST (2-12 x P) M2(12) (19200A)

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3 50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 7.5 (300A) U4, Extremely Inverse 4.0 50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

XF-MSB 204 MAIN

1000 kVA 12470 / 480 V

MSB-204-PRIM FU

CUTLER-HAMMER

20E-300E TYPE: CLE, 15.5kV E-Rated Sensor/Trip: 50A, Phase

50.0 Amps

MSB 204 MAIN CB

CUTLER-HAMMER

LSI, 200-5000A

TYPE: DS, RMS 510/610/810/910

Sensor/Trip: 1600A, Plug: 1600 AT Phase LTPU (0.5-1.0 x P) 0.5 (800A) LTD (2-24 Sec.) 4 STPU (2-10 x LTPU) S2(10) (8000A) STD (0.1-0.5 Sec.) 0.5 Sec. (I^s T On) INST (2-12 x P) M2(12) (19200A)

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3 50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 7.5 (300A) U4, Extremely Inverse 4.0 50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

XF-MSB 204 MAIN

1000 kVA 12470 / 480 V

Plot name: FDR1-B77A/B PHASE Ref. Voltage: 12470V Current Scale: x 10

MSB-204-PRIM FU

XF-MSB 204 MAIN PRI

S

P XF-MSB 204 MAIN

XF-MSB 204 MAIN SEC

MSB 204 MAIN

MSB 204 MAIN CB

MSB 204A

MSB-204-PRIM

RELAY B115 MAIN1

RELAY CIRC 1

Eaton Electrical Services and Systems

VAMC - Mountain Home 3-6

RELAY B115 MAIN1 - Ground RELAY CIRC 1 - Ground

0.5 1 10 10

1K 10 K

0.01

0.10

CURRENT IN AMPERES

TIME IN SECONDS

RELAY B115 MAIN1

SEL

50G/51G, 5A nom.

TYPE: 751

Ground 51G1P, (0.25-24 x CTR) 5 (400A) U4, Extremely Inverse 4.0 50G1P, (0.25-100 x CTR) 50 (4000A) 50G1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 1

SEL

50N/51N, 5A nom.

TYPE: 751

Ground 51N1P, (0.25-24 x CTR) 10 (200A) U4, Extremely Inverse 1.0 50N1P, (0.25-100 x CTR) 80 (1600A) 50N1D, (0.001 - 5s) 0.01 (sec)

RELAY B115 MAIN1

SEL

50G/51G, 5A nom.

TYPE: 751

Ground 51G1P, (0.25-24 x CTR) 5 (400A) U4, Extremely Inverse 4.0 50G1P, (0.25-100 x CTR) 50 (4000A) 50G1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 1

SEL

50N/51N, 5A nom.

TYPE: 751

Ground 51N1P, (0.25-24 x CTR) 10 (200A) U4, Extremely Inverse 1.0 50N1P, (0.25-100 x CTR) 80 (1600A) 50N1D, (0.001 - 5s) 0.01 (sec)

CKT1 FLA x 4CKT1 FLA x 4

Plot name: FDR1-GROUND Ref. Voltage: 12470V Current Scale: x 10

RELAY B115 MAIN1

RELAY CIRC 1

RELAY JCPB 254

Eaton Electrical Services and Systems

VAMC - Mountain Home 3-7

RELAY CIRC 3 - Phase

TX Inrush

XF-MSB-201 MN

0.5 1 10 10

1K 10 K

0.01

0.10

CURRENT IN AMPERES

TIME IN SECONDS

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3 50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 3

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 14 (560A) U4, Extremely Inverse 2.0 50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

BLD 201 MVS FU

LITTELFUSE

100-300A TYPE: LDN, 15.5kV E-Rated Sensor/Trip: 100A, Phase

100.0 Amps

MSB-201 MN CB

WESTINGHOUSE

AMPTECT IA

TYPE: DS

Sensor/Trip: 4000A, Plug: 4000 AT Phase

LTPU 1.0 (4000A)

LTD 4.0

STPU 4.0 (16000A)

STD 0.33

CKT3 TOTAL XFMR INRUSH

Transformer @ 0.1 Seconds TYPE: Inrush Marker Phase

SEGMENT #1

SEGMENT #2

XF-MSB-201 MN

3000 kVA 12470 / 480 V

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3 50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 3

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 14 (560A) U4, Extremely Inverse 2.0 50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

BLD 201 MVS FU

LITTELFUSE

100-300A TYPE: LDN, 15.5kV E-Rated Sensor/Trip: 100A, Phase

100.0 Amps

MSB-201 MN CB

WESTINGHOUSE

AMPTECT IA

TYPE: DS

Sensor/Trip: 4000A, Plug: 4000 AT Phase

LTPU 1.0 (4000A)

LTD 4.0

STPU 4.0 (16000A)

STD 0.33

CKT3 TOTAL XFMR INRUSH

Transformer @ 0.1 Seconds TYPE: Inrush Marker Phase

SEGMENT #1

SEGMENT #2

XF-MSB-201 MN

3000 kVA 12470 / 480 V

Plot name: FDR3-B201 PHASE Ref. Voltage: 12470V Current Scale: x 10

RELAY B115 MAIN1

RELAY CIRC 3

BLD 201 MV SG

BLD 201 MVS FU

XF-MSB-201 MN PRI

S

P XF-MSB-201 MN

XF-MSB-201 MN SEC

MSB-201 MN

MSB-201 MN CB

MSB-201

Eaton Electrical Services and Systems

VAMC - Mountain Home 3-8

TX Inrush

XF-BLD 205 MDP

0.5 1 10 10

1K 10 K

0.01

0.10

CURRENT IN AMPERES

TIME IN SECONDS

RELAY CIRC 3

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 14 (560A) U4, Extremely Inverse 2.0 50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3 50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

XF-BLD 205 MDP FU

CUTLER-HAMMER

20E-300E TYPE: CLE, 15.5kV E-Rated Sensor/Trip: 50A, Phase

50.0 Amps

BLD 205 MDP CB3

CUTLER-HAMMER

LSI, 400-1200A Fixed Plug

TYPE: ND, RMS 310

Sensor/Trip: 1200A, Plug: 1000 AT Phase LTPU (1.0 x P) Fixed (1000A) LTD (Fixed) Fixed STPU (2-8 x P) 8 (8000A) STD (Inst-300 ms) 300 ms (I^s T On) INST (14000A) Fixed (14000A)

XF-BLD 205 MDP

1000 kVA 12470 / 480 V

RELAY CIRC 3

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 14 (560A) U4, Extremely Inverse 2.0 50P1P, (0.25-100 x CTR) 100 (4000A) 50P1D, (0.001 - 5s) 0.01 (sec)

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3 50P1P, (0.25-100 x CTR) 62.5 (5000A) 50P1D, (0.001 - 5s) 0.01 (sec)

XF-BLD 205 MDP FU

CUTLER-HAMMER

20E-300E TYPE: CLE, 15.5kV E-Rated Sensor/Trip: 50A, Phase

50.0 Amps

BLD 205 MDP CB3

CUTLER-HAMMER

LSI, 400-1200A Fixed Plug

TYPE: ND, RMS 310

Sensor/Trip: 1200A, Plug: 1000 AT Phase LTPU (1.0 x P) Fixed (1000A) LTD (Fixed) Fixed STPU (2-8 x P) 8 (8000A) STD (Inst-300 ms) 300 ms (I^s T On) INST (14000A) Fixed (14000A)

XF-BLD 205 MDP

1000 kVA 12470 / 480 V

Plot name: FDR3-B205 PHASE Ref. Voltage: 12470V Current Scale: x 10

RELAY CIRC 3

RELAY B115 MAIN1

S

P XF-BLD 205 MDP

XF-BLD 205 MDP SEC

CBL-1082

XF-BLD 205 MDP FU

BLD 205 MDP CB3

XF-BLD 205 MDP PRI

BLD 205 MDP

Eaton Electrical Services and Systems

VAMC - Mountain Home 3-9

RELAY CIRC 3 - Ground

0.5 1 10 10

1K 10 K

0.01

0.10

CURRENT IN AMPERES

TIME IN SECONDS

RELAY B115 MAIN1

SEL

50G/51G, 5A nom.

TYPE: 751

Ground

51G1P, (0.25-24 x CTR) 5 (400A) U4, Extremely Inverse 4.0 50G1P, (0.25-100 x CTR) 50 (4000A) 50G1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 3

SEL

50N/51N, 5A nom.

TYPE: 751

Ground

51N1P, (0.25-24 x CTR) 15 (300A) U4, Extremely Inverse 0.5 50N1P, (0.25-100 x CTR) 80 (1600A) 50N1D, (0.001 - 5s) 0.01 (sec)

CKT3 FLA x 4 Transformer @ 0.1 Seconds TYPE: Inrush Marker Phase

SEGMENT #1

SEGMENT #2

RELAY B115 MAIN1

SEL

50G/51G, 5A nom.

TYPE: 751

Ground

51G1P, (0.25-24 x CTR) 5 (400A) U4, Extremely Inverse 4.0 50G1P, (0.25-100 x CTR) 50 (4000A) 50G1D, (0.001 - 5s) 0.01 (sec)

RELAY CIRC 3

SEL

50N/51N, 5A nom.

TYPE: 751

Ground

51N1P, (0.25-24 x CTR) 15 (300A) U4, Extremely Inverse 0.5 50N1P, (0.25-100 x CTR) 80 (1600A) 50N1D, (0.001 - 5s) 0.01 (sec)

CKT3 FLA x 4 Transformer @ 0.1 Seconds TYPE: Inrush Marker Phase

SEGMENT #1

SEGMENT #2

Plot name: FDR3-GROUND Ref. Voltage: 12470V Current Scale: x 10

RELAY B115 MAIN1

115 SWGR CIRC 3

RELAY CIRC 3

115 SWGR-B

Eaton Electrical Services and Systems

VAMC - Mountain Home 3-10

RELAY CIRC 4 - Phase

TX Inrush

XF-MSG-200 MN

0.5 1 10 10

1K 10 K

0.01

0.10

CURRENT IN AMPERES

TIME IN SECONDS

RELAY B115 MAIN1

SEL

50P/51P, 5A nom.

TYPE: 751

Phase 51P1P, (0.25-24 x CTR) 8 (640A) U4, Extremely Inverse 3.3 50P1P, (0.25-100 x…