ELECTRICAL DISTRIBUTION STUDY

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ELECTRICAL DISTRIBUTION STUDY

FOR

UNIVERSITY OF NORTH TEXAS

DENTON, TEXAS

JUNE 17, 2011

THE SEAL APPEARING ON THIS DOCUMENT WAS AUTHORIZED BY R. TIM YAGGI, P.E. 57030 ON JUNE 17, 2011.

YAGGI ENGINEERING, INC.

5840 W. I-20, Suite 270 Arlington, Texas 76017 817-483-2373 / fax 817-483-4233

www.yaggiengineering.com YEI Project No. 9046.00 Texas Registration No. F-9622

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TABLE OF CONTENTS

I. PURPOSE AND SCOPE II. EXECUTIVE SUMMARY

III. BUILDING LOAD INFORMATION

· Existing Main Campus Building Peak Loads (3 Year Peak) · Existing Eagle Point Building Peak Loads (2 Year Peak) · Existing Building Peak Loads (By UNT Feeder)

IV. LOAD FLOW ANALYSIS

· Existing (Normal Conditions) · Existing (Outage Feeder #1A) · Existing (Outage Feeder #2) · Existing (Outage Feeder #3) · Existing (Outage Feeder #4A)

· Existing Conditions Plus Future (Normal Conditions) – Main Campus · Existing Conditions Plus Future (Normal Conditions) – Eagle Point V. PRIMARY SWITCHGEAR

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Yaggi Engineering, Inc.

I. PURPOSE AND SCOPE

The purpose of this study is to evaluate the capacity and configuration of the existing primary (13.2 KV) electrical distribution system for the Main Campus and Eagle Point Campus. A similar electrical distribution study was completed in 2003 and this study will update information in that study as it relates to loads, 13.2 KV feeder capacities and Utility Company service capacity.

Unlike the 2003 study, this study is limited to evaluation of the primary system configuration and capacity, and does not include equipment and conductor condition assessment, or evaluation of transformer and building service capacities. Normal conditions and worst case outage conditions are considered in the evaluation of the campus feeders and substations serving those feeders.

This study is based on electrical load information provided by UNT and Denton Municipal Electric (DME), and includes existing and anticipated future loads. The study provides general recommendations and concepts for improvements necessary to properly serve these loads. The study does not provide specific switchgear, feeder and substation designs. In order to develop construction documents necessary to implement the concepts, it will be necessary to analyze and coordinate substation upgrade options and new substation options with Denton Municipal Electric. An extensive site investigation will also be necessary to determine pathways for new 13.2 KV feeders and duct banks.

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II. EXECUTIVE SUMMARY

Both the capacity and configuration of the 13.2 KV distribution system for the Main Campus should be upgraded to properly serve existing and anticipated future loads. Loss of any of the four DME feeders will likely result in an overload condition on the UNT and DME systems, depending on load at the time of feeder loss. Loss of any of the major UNT 13.2 KV substation feeder exits may result in an overload condition, the severity of which will depend on which feeder and the load at the time of the outage.

The current DME service capacity for the Main Campus is 20 MVA. The projected diversified load which includes anticipated future loads is 29.1 MVA. This diversified load is well below the cumulative maximum demand load for each building; therefore 29.1 MVA should be considered the absolute minimum DME service capacity considered in any upgrade option.

The current configuration of the campus distribution system does not allow for seamless transfer of loads from one UNT feeder to another without impacting the load on the DME system feeders. This is because the main loops are created by a source switch at each substation instead of the same substation. The system should be reconfigured to allow transfer of loads without the requirement to notify DME; however emergency ties should be provided to transfer loads to an alternate DME feeder during an emergency condition. Advantages of constructing a high voltage substation should also be discussed with DME. This substation could supplement the existing DME feeders or replace them.

Additional recommendations are included in Section VI, along with a very preliminary “order of magnitude” opinion of probable construction cost. Upon selection of the desired DME service capacity upgrade option, construction documents for UNT feeder upgrades can be developed. At that time, refined cost information can be developed for each specific upgrade option. Various items can be designed as alternates, such as conversion of selected radial feeds to loop feed.

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III. BUILDING LOAD INFORMATION

A three year history of individual building KW demand was provided by UNT for the Main Campus and two year history for Eagle Pont. This maximum demand value was used to determine the total “worst case” maximum demand for each UNT feeder.

This “worst case” UNT feeder maximum demand was compared to DME feeder maximum demand information provided by DME. By comparing the values, a diversity factor was developed for each UNT feeder. Resulting diversity factors ranged from 71% to 82%. This allows each UNT feeder to be evaluated both for worst case maximum demand and actual recorded diversified maximum demand. Included in this section are the maximum peak loads for the Main Campus on a per building basis for 2008 through 2010. The same information is provided for Eagle Point for 2008 and 2009.

The maximum demand for the periods above is summarized by UNT feeder. These tables also provide individual building area (square feet), peak watts per square foot, and peak load amps at 13.2 KV.

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Date KW

ART BLDG AUGUST 2009 375

AUDITORIUM-ENGLISH BLDG FEBRUARY 2010 135

BAIN HALL APRIL 2008 222

BRADLEY ST APARTMENTS APRIL 2009 27

BRUCE HALL JANUARY 2008 310

BUSINESS ADMIN BLDG JANUARY 2008 283

BUS LEADERSHIP BUILDING JANUARY 2010 36

CHEMISTRY BLDG AUGUST 2009 1125

CHESTNUT HALL JULY 2008 571

CHILTON HALL NOVEMBER 2008 470

CLARK HALL SEPTEMBER 2009 397

COLISEUM JUNE 2008 885

CRUMLEY HALL SEPTEMBER 2008 201

CURRY HALL OCTOBER 2008 72

EAGLE STUDENT SERVICES JUNE 2009 369

ENVIR SCIENCE BLDG FEBRUARY 2008 569 FACILITIES COMPLEX APRIL 2008 641

Building 3 Year Peak

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Date KW

GATEWAY CENTER FEBRUARY 2010 608

GAB AUGUST 2008 826

GAB CITC NORTH AUGUST 2008 1316

GOOLSBY CHAPEL JUNE 2009 14

HICKORY HALL & ACCELERATOR SEPTEMBER 2008 317

HIGH MAST LIGHTS MARCH 2010 9

HONORS HALL JANUARY 2008 302

HURLEY ADMIN BLDG APRIL 2008 570

ISB APRIL 2008 448

ISB CC APRIL 2008 137

INTRAMURAL FIELD SEPTEMBER 2009 227

KEN BAHNSEN GYM JANUARY 2008 183

KERR HALL AUGUST 2008 744

LANGUAGE BLDG SEPTEMBER 2009 163

LEGENDS HALL JULY 2008 224

LIFE SCIENCES BUILDING "A" SEPTEMBER 2010 689

LIFE SCIENCES BUILDING "B" OCTOBER 2010 318

MAPLE STREET HALL SEPTEMBER 2009 438

MARQUIS HALL FEBRUARY 2010 150

MATTHEWS HALL FEBRUARY 2008 263 MATTHEWS HALL ANNEX SEPTEMBER 2009 74

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Date KW

MCCONNELL HALL FEBRUARY 2008 158

MOZART SQUARE HALL SEPTEMBER 2009 190

MUSIC ANNEX MARCH 2008 240

MUSIC BLDG AUGUST 2008 574

MUSIC PRACTICE COMPLEX JULY 2008 318

PARKING GARAGE APRIL 2008 124

PERFORMING ARTS ANNEX JUNE 2009 43

PERFORMING ARTS CENTER JULY 2009 510

PHYSICAL EDUCATION BLDG NOVEMBER 2009 575

PHYSICS BLDG SEPTEMBER 2008 222

POWER PLANT FEBRUARY 2010 4346

RADIO,TV, FILM & PERF ARTS FEBRUARY 2008 236

RESIDENCE HALL ASSOCIATION JULY 2009 17

SANTA FE SQUARE HALL APRIL 2008 109

SCIENCE RESEARCH BLDG FEBRUARY 2008 384

SCOULAR HALL FEBRUARY 2008 78

STADIUM METER NOT OPERATIONAL 35 STADIUM COMPLEX SEPTEMBER 2008 155

EXISTING BUILDING PEAK LOADS

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Date KW

STOVALL HALL FEBRUARY 2008 136

STUDENT REC CENTER SEPTEMBER 2009 778

TERRILL HALL JUNE 2009 125

TRADITIONS FIELDS - ALL FEBRUARY 2008 79

TRADITIONS HALL SEPTEMBER 2008 376

UNIVERSITY SERVICES BLDG AUGUST 2008 384

UNIVERSITY UNION OCTOBER 2008 1065

WEST HALL SEPTEMBER 2008 319

WILLIS LIBRARY SEPTEMBER 2008 637

WOOTEN HALL JANUARY 2008 143

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Date KW

DUCK POND AUGUST 2008 55

E.P. ATHLETIC CENTER JUNE 2008 309

E.P. INTRAMURAL REC SPORTS DECEMBER 2009 95

E.P. UTILITY BLDG. APRIL 2008 500

E,P. VICTORY HALL APRIL 2008 286

E.P. WARANCH TENNIS COMPLX NOVEMBER 2008 175

MEAN GREEN VILLAGE AUGUST 2009 280

MGV BLDG L-POLICE K9 UNIT DECEMBER 2008 31

MGV BLDG P UNIV COMM & MKT JUNE 2008 126

MGV - WOMENS SOFTBALL FLD MARCH 2009 120

BUILDING 2 Year Peak

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PEAK PEAK PEAK

KW BLDG WATTS/ LOAD

BUILDING NAME DEMAND SQ. FT. SQ. FT. AMPS

BAIN HALL 222 22383 9.92 10

CHESTNUT HALL 571 74121 7.70 25

CHILTON HALL 470 111918 4.20 21

COLISEUM 885 196192 4.51 39

HURLEY ADMINISTRATION BLDG 570 60630 9.40 25

KEN BAHNSEN GYM 183 38723 4.73 8

MUSIC PRACTICE COMPLEX 318 45481 6.99 14 PHYSICAL EDUCATION BLDG 575 106307 5.41 25 SANTA FE SQUARE HALL 109 38760 2.81 5 STUDENT RECREATION CENTER 778 138804 5.60 34

TRADITIONS HALL 376 82987 4.54 16

CALCULATED MAXIMUM DEMAND TOTAL 5058 916306 5.52 221

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FACILITIES COMPLEX 641 88423 7.25 28

WEST HALL 319 95852 3.33 14

CALCULATED MAXIMUM DEMAND TOTAL 960 184275 5.21 42

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AUDITORIUM 135 57290 2.35 6

BRUCE HALL 310 129841 2.39 14

BUSINESS ADMINISTRATION BLDG 283 89520 3.16 12

CHEMISTRY BLDG 1125 108490 10.37 49

ENVIRONMENTAL SCIENCE BLDG 569 121060 4.70 25 GAB & GAB CITC NORTH (826 + 1316) 2142 145665 14.70 94

HICKORY HALL 317 45833 6.92 14

ISB & ISBCC (448 + 137) 585 101301 5.77 26

LANGUAGE BLDG 163 66851 2.43 7

LEGENDS HALL 224 86368 2.59 10

LIFE SCIENCES BLDG "A" & "B"(689 + 318) 1007 176296 5.71 44

MARQUIS HALL 150 39592 3.79 7

MCCONNELL HALL 158 101362 1.56 7

POWER PLANT 2173 6144 353.68 95

SCIENCE RESEARCH BLDG 384 63893 6.01 17

TERRILL HALL 125 58650 2.14 5

CALCULATED MAXIMUM DEMAND TOTAL 9850 1398156 7.04 431

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CLARK HALL 397 107595 3.69 17 CRUMLEY HALL 201 71234 2.82 9 GATEWAY CENTER 608 107821 5.64 27 GOOLSBY CHAPEL 14 2260 6.19 1 HONORS HALL 302 75291 4.01 13 KERR HALL 744 210279 3.54 33

MAPLE STREET HALL 438 136190 3.22 19

MATTHEWS HALL 263 80986 3.25 12

MOZART SQUARE HALL 190 74121 2.56 8

MUSIC ANNEX 240 16394 14.64 11

MUSIC BLDG 574 140866 4.08 25

PERFORMING ARTS ANNEX 43 4943 8.74 2

PERFORMING ARTS CENTER 510 72403 7.04 22 RES. HALL ASSOC. & HIGH MAST LITES 17 1667 10.20 1

SCOULAR HALL 78 20866 3.74 3

STADIUM (METER NOT WORKING) 35 107724 0.32 2

STADIUM COMPLEX 155 23286 6.63 7

STOVALL HALL 136 44216 3.08 6

UNIVERSITY SERVICES BLDG 384 49290 7.79 17

WILLIS LIBRARY 637 175521 3.63 28

CALCULATED MAXIMUM DEMAND TOTAL 5967 1522953 3.92 261

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ART BLDG 375 94994 3.95 16

CURRY HALL 72 27406 2.61 3

EAGLE STUDENT SERVICES CENTER 369 72726 5.08 16

MATTHEWS HALL ANNEX 74 7206 10.27 3

PARKING GARAGE 124 168315 0.74 5

PHYSICS BLDG 222 54836 4.04 10

POWER PLANT 2173 12287 176.85 95

RADIO,TV, FILM & PERFORMING ARTS 236 117003 2.02 10

UNIVERSITY UNION 1065 202727 5.25 47

WOOTEN HALL 143 89329 1.60 6

CALCULATED MAXIMUM DEMAND TOTAL 4852 846829 5.73 212

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IV. LOAD FLOW ANALYSIS

Using the demand load information provided by UNT and DME, load flow diagrams were developed for normal operating conditions and “worst case” outage conditions. The load values in KW and amps on the load flow diagrams are based on UNT maximum building demand information as described in Section III. Both UNT maximum demand information and DME diversified demand information are included in tabular form for normal conditions and each outage condition. This provides evaluation of feeders from both a worst case and actual DME metered basis.

Worse case outage conditions for the UNT feeders exist when a UNT feeder exit is lost on either substation. A loss of the substation feeder exit requires that the entire feeder be transferred to another feeder served from the opposite substation. The Northwest Substation located on North Texas Blvd. at Sycamore is served from DME Hickory substation feeders #214 and #222. The Southeast Substation located on Maple St. between Avenue A and Central Ave. is served from DME Locust substation feeders #211 and #233. All four DME feeders serve UNT and non-UNT loads.

Under normal operating conditions DME reserves 5 MVA of feeder capacity for UNT on each of the four feeders serving UNT for a total of 20 MVA. Under emergency conditions, it is permissible for UNT to transfer load from one DME feeder to another due to a DME or UNT feeder loss. During this emergency load transfer period, DME can serve a maximum 9 MVA UNT load on any single DME feeder. Transfer of load to alternate DME feeders must be approved by DME. The duration of this load transfer may also be limited by DME.

Normal operating loads are as follows:

§ NW Substation

· DME Feeder HK214 (UNT Feeder #1A/#1B) o Calculated UNT Max Demand 6.0 MVA o DME Recorded Max Demand 4.3 MVA · DME Feeder HK222 (UNT Feeder #2)

o Calculated UNT Max Demand 9.8 MVA o DME Recorded Max Demand 6.5 MVA

§ SE Substation

· DME Feeder L211 (UNT Feeder #4A)

o Calculated UNT Max Demand 4.9 MVA o DME Recorded Max Demand 3.9 MVA · DME Feeder L233 (UNT Feeder #3)

o Calculated UNT Max Demand 6.0 MVA o DME Recorded Max Demand 4.9 MVA

§ Eagle Point

· DME Feeder RD222

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DME Feeder Loading Summary (Main Campus)

The peak demand of 6.5 MVA as recorded by DME indicates that UNT Feeder #2 at the NW Substation exceeded the normal allowable load of 5 MVA on DME Feeder HK222.

UNT Feeder #3 measured demand of 4.9 MVA is very near the normal DME allowable load of 5 MVA on DME Feeder L233. Addition of the cell tower load will push the demand beyond the 5 MVA limit.

An additional feeder has recently been installed to provide service to the new Business Leadership Building and Parking Garage/ Power Plant. This feeder is connected to DME Feeder L211 (UNT Feeder #4B). This added load will increase the load on DME Feeder L211 to 12.4 MVA, well beyond the normal allowable limit of 5 MVA.

DME-L211

Existing 78% (DME Demand) 98% (Calculated) w/ Future 248% (DME Demand) 268% (Calculated) DME-L233

Existing 98% (DME Demand) 120% (Calculated) w/ Future 118% (DME Demand) 140% (Calculated) DME-HK214

Existing 86% (DME Demand) 120% (Calculated) w/ Future 86% (DME Demand) 120% (Calculated) DME-HK222

Existing 130% (DME Demand) 196% (Calculated) w/ Future 130% (DME Demand) 196% (Calculated) The above feeder loading summary is based on 5 MVA normal load limit set by DME. Under certain conditions, these loads may approach calculated UNT maximum demand levels.

Basically the DME normal service capacity to the main campus is 20 MVA (four feeders at 5 MVA each). Based on the anticipated future loads identified in this study, the projected DME diversified load (existing plus future) is 29.1 MVA, which exceeds the existing DME service capacity by 9.1 MVA. 29.1 MVA is the minimum DME service capacity required. If calculated worst case loads were used, this capacity would need to be increased by an additional 20% to 30%.

UNT Feeder Loading Summary (Main Campus)

Main Campus feeders are generally adequate under normal loading conditions based on DME diversified loads, however if any of the UNT substation feeder exits are lost under maximum calculated load conditions, it will result in an overloaded feeder at the opposite substation.

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With all feeders available, UNT substation feeder exit #2 is loaded at 92% under calculated maximum demand periods and 61% under DME diversified load conditions. This particular feeder has a very high demand diversity (66%) which means that the DME recorded demand of 6.5 MVA is much less than the calculated maximum demand of 9.8 MVA. For this feeder, the potential is high that the actual demand could exceed the DME recorded maximum demand under certain conditions. Other feeder demand diversity factors range from 71% to 82%, which means that the recorded DME demand is 71% to 82% of the calculated worst case demand.

With anticipated future load growth, the 13.2 KV distribution system will be taxed under normal and emergency conditions. Any loading above 40% limits the feeder’s ability to serve as an alternate source to pick up load due to another feeder outage. Using DME demand diversities and calculated maximum demand, the primary feeders will be loaded as follows:

UNT 1A/1B 40% (DME Demand) 57% (Calculated) UNT 2 61% (DME Demand) 93% (Calculated) UNT 3 55% (DME Demand) 66% (Calculated) UNT 4A 37% (DME Demand) 46% (Calculated) UNT 4B 80% (Calculated – no load history) UNT Feeder Loading Summary (Eagle Point)

The Eagle Point section of the UNT campus is not served from the main campus substations and feeders. It is served through a primary metering point located on Bonnie Brae St. south of IH-35E. Since this portion of the campus is served from a single radial, there are no provisions to sectionalize and bypass a fault. All feeder sections are adequately rated to serve the current load. Future stadium, chiller and student housing loads will require upgrade of the existing 13.2 KV distribution system.

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219 AMPS 394 AMPS

UNT FEEDER RATING (500 CU) 465 AMPS

DME UNT MVA AMPS TOTAL AMPS DIVERSITY FACTOR AMPS

1A 5.0 219 1B 1.0 44 L211 4A L233 3 6.0 263 82% 3.9 215 80% 215 431 66% 284 6.5 4.9 215 172 4.9

DME RECORDED MAXIMUM DEMAND

DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER 5 MVA

9 MVA

263

10.6 MVA

HK222 2 9.8 431

FEEDER CALCULATED UNT FEEDER MAX DEMAND

71% 187

MVA

LOAD FLOW ANALYSIS - EXISTING (NORMAL CONDITIONS)

DME EMERGENCY LOADING PER DME FEEDER

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DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER 219 AMPS 394 AMPS

DME UNT MVA TOTAL AMPS DIVERITY FACTOR

1A 0.0 0 1B 1.0 44 219 71% 155 263 82% 216 3.9 80% 6.5 8.5 66% 371 L211 4A 4.9 L233 3 11.0 44 0.7 HK222 71% 44 431 9.8 2 431 482 215 215 482 MVA

LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #1A)

AMPS

CALCULATED UNT FEEDER MAX DEMAND

HK214

NOTE: TRANSFER UNT #1A LOAD OF 5.0 MVA TO UNT #3.

DME RECORDED MAXIMUM DEMAND FEEDER 5 MVA 9 MVA 10.6 MVA AMPS 31 284 172

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219 AMPS 394 AMPS

DME UNT MVA TOTAL AMPS DIVERITY FACTOR

1A 5.0 219

1B 1.0 44

215 80% 172

431 66% 284

NOTE: TRANSFER UNT #2 LOAD OF 9.8 MVA TO UNT #4A.

FEEDER DME RECORDED MAXIMUM DEMAND

4.9

456 215

646 L211 4A

LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #2)

AMPS

187

DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER

71% MVA 4.3 263 AMPS 10.4 0 0% 82% 0.0 263 0 14.8 646 6.0 HK214 HK222 2 L233 3 263 5 MVA 9 MVA 10.6 MVA CALCULATED

UNT FEEDER MAX DEMAND

0

263

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219 AMPS

DME EMERGENCY LOADING PER DME FEEDER 394 AMPS

219 71% 155

263 82% 216

1B 1.0 44 44 71% 31

HK222 2 9.8 66%

LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #3)

AMPS MVA

DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER 5 MVA

9 MVA L233 3 0.0 L211 4A 4.9 80% 3.9 6.5 0% 0.0 284 0 172

NOTE: TRANSFER UNT #3 LOAD OF 6.0 MVA TO UNT #1A

10.6 MVA

HK214 1A 11.0 482 402 9.2

431 0 215 431 AMPS 0 215 526

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DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER 219 AMPS 394 AMPS

1A 5.0 219 1B 1.0 44 431 66% 284 215 80% 172 263 263 HK222 0.0 0% 10.4 82% 4.9 456 L211 4A 0 L233 3 6.0

LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #4A)

DME EMERGENCY LOADING FOR DME FEEDERS

HK214 263 4.3

AMPS

263

71%

AMPS

2 14.8 646 646

MVA

NOTE: TRANSFER UNT #4A LOAD OF 4.9 MVA TO UNT #2

5 MVA 9 MVA 10.6 AMPS 0 0 215 0 187

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SE SUBSTATION

LOAD TOTAL TOTAL

DESCRIPTION DME UNT AMPS MVA

EXISTING LOAD L211 4A 172 172 3.9 3.9 EXIST BUSINESS LEADERSHIP BLDG L211 4B 87 2.0 APR. 2011 POWER PLANT AND GARAGE L211 4B 109 2.5 JAN. 2011 POWER PLANT CHILLERS (2) L211 4B 109 2.5 APR. 2012

AUDITORIUM L211 4B 66 1.5 2013

SUBTOTAL L211 544 12.4

EXISTING LOAD L233 3 215 215 4.9 4.9 EXIST CELL TOWER L233 3 44 44 1.0 1.0 2010

SUBTOTAL L233 259 5.9 5.9

TOTAL (SE SUBSTATION) 803 18.3

NW SUBSTATION

EXISTING LOAD HK222 2 285 285 6.5 6.5 EXIST FUTURE LOAD HK222 2

SUBTOTAL HK222 2 285 6.5

EXISTING LOAD HK214 1A/1B 187 187 4.3 4.3 EXIST FUTURE LOAD HK214 1A/1B

SUBTOTAL HK214 1A/1B 187 4.3 TOTAL (NW SUBSTATION) 472 10.8 1275 29.1 AMPS MVA AMPS MVA 372 FEEDER AMPS MVA

TOTAL MAIN CAMPUS

DATE

(NORMAL CONDITIONS)

8.5

LOAD FLOW ANALYSIS - EXISTING PLUS FUTURE

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EAGLE POINT

EXISTING LOAD RD222 EP 66 66 1.5 1.5 EXIST

STADIUM RD222 EP 206 4.7 JUL. 2011 CHILLER RD222 EP 66 1.5 JUL. 2011 STUDENT HOUSING RD222 EP 109 2.5 2013 446 10.2 AMPS MVA 381 8.7

TOTAL EAGLE POINT

LOAD FLOW ANALYSIS - EXISTING PLUS FUTURE

(NORMAL CONDITIONS)

FEEDER

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V. PRIMARY SWITCHGEAR

Existing campus switchgear consist of freestanding metal clad S&C switchgear at the Northwest Substation and Southeast Substation, pad mounted PMH style S&C switchgear and Vista switchgear. The switchgear provides sectionalizing capability and fuse positions provide cable protection, transformer protection and selective coordination. The scope of this study did not include evaluation of fuse sizes and selective coordination. Physical inspection and evaluation of the switchgear condition were also not included in the study.

Under normal conditions, the switchgear is adequately rated to serve main campus distribution feeders. Under outage conditions 2 and 4A, the following switchgear will be overloaded based on calculated worst case conditions:

Outage Feeder #2 P45-A, P46A, Feeder #4A Sub Exit

Outage Feeder #4A P21-A, P29A, Vista 422, Feeder #2 Sub Exit Using DME demand loads for each outage condition, all 600 amp distribution switchgear is adequate for main line service.

When future loads are added to the system, some switchgear loads will approach or exceed the 600 amp switchgear nameplate rating for all four major outage conditions where the substation feeder exit is lost.

The following table includes distribution switchgear data sorted by device number, building location, switchgear type, fuse ratings and buildings served.

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UNT Device Building

Number Location Type *Fuse Serves

80A STADIUM 2400Y 65A USB

200A P7-A

100A STUDENT REC. 30A WEST HALL

20A FACILITIES 80A TRADITIONS 80A SANTA FE

100A STADIUM AND USB 20A ATHELETICS 125A (2) PMH DEVICES

15A PAC ANNEX

85A LEGENDS 150A PAC 150A (3) PMH DEVICES 50A GATEWAY 200A (4) PMH DEVICES 175A COLISEUM 40A MOZART

65A ENVIR SCIENCE

65A McCONNELL

100A PHYS ED BLDG

30A CHILTON

100A CHESTNUT

40A MUSIC PRACTICE 40A BAIN

20A BAHNSEN GYM 65A CLARK

50A HONORS * DATA OBTAINED FROM UNT RECORDS.

P5-A STADIUM & USB

MOZART HALL P18-A

CLARK & HONORS P10-A

P26-A

ATHLETICS

P17-A GATEWAY

P12-B PERF ARTS CNTR P12-A PAC ANNEX

PMH-9 PMH-9 PMH-9 PMH-9 PMH-9 PMH-9 P23-B BAIN & KEN BAHN GYM PMH-9

P17-B COLISEUM PMH-9

13.2 KV SWITCHGEAR

P6-B STUDENT REC. PMH-9

P22-C CHESTNUT HALL VISTA TRADITIONS & SANTA

P7-A PMH-9

P6-C FAC & WEST HALL PMH-9

P22-B CHILTON HALL PMH-9 P22-A PHYS ED BLDG PMH-11

PMH-12

P12.5-A LEGENDS VISTA

P21-A McCONNELL PMH-9

P23-A MUSIC PRACTICE PMH-9 P19-A ENVIR.SCI. EESAT PMH-9

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13.2 KV SWITCHGEAR

100A SCI. RES.

80A PMH DEVICE P19-A 125A CHEMISTRY

65A TERR & MARQ 100A PMH DEVICE P28-C 30A BRUCE ?? LIFE SCIENCE 65A BIOLOGY 120/208V 50A BIOLOGY 277/480V 40A ADMIN. BLDG 175A LIBRARY MUSIC BUILDING MUSIC BUILDING 65A MATTHEWS

(2)15A STOVALL & SCOULAR

80A STUDENT SER

40A CRUMLEY 20A MUSIC ANNEX

5A RES HALL ASSOC

175A KERR

50A MAPLE

65A HICKORY ACCEL 40A HICKORY HALL

65A GAB CITC NOR.

50A I.S.B.

40A BUSINESS AD 15A I.S.B. COMPUTER * DATA OBTAINED FROM UNT RECORDS.

PMH-9 PMH-9 PMH-9 PMH-10 PMH-9 P32-B P30-B MAPLE KERR LIBRARY MUSIC BUILDING ADMINISTRATION P36-B P36-A P32-A PMH-9 P29-B LIFE SCIENCE VISTA P28-B TERRILL & CHEM PMH-9

P29-A

P38-A I.S.B. PMH-11

P28-A SCIENCE RESEARCH PMH-9

BRUCE PMH-9

P29-C BIOLOGY

P37-A HICKORY PMH-9

P37-B GAB CITC NORTH PMH-9

P38-B BUSINESS & I.S.B. PMH-9 PMH-9 N.E. COR.CRUMLEY PMH-13 P33-C EAGLE STUDENT SER PMH-9

P34-B CRUMLEY/ MUSIC ANN

P33-A STOVALL/SCOULAR PMH-12

P34-C RES.HALL ASSOC. PMH-9 P34-A

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13.2 KV SWITCHGEAR

175A POWER PLANT 10A POWER PLANT

175A POWER PLANT 50A GAB 50A GAB 50A LANGUAGE 15A AUDITORIUM 40A PHYSICS 20A CURRY ?? PMH DEVICE P33-A

50A ART BUILDING

40A RADIO/TV

200A PMH DEVICE P33-C 100A STUDENT UNION

15A MATT ANNEX

50A WOOTEN HALL * DATA OBTAINED FROM UNT RECORDS.

LANGUAGE PMH-9

P38-G CURRY & PHYSICS PMH-9

P38-E GAB PMH-7

P38-C POWER PLANT PMH-9

P45-C MATTHEWS ANNEX PMH-9 P38-D POWER PLANT PMH-9

P43-A ART BUILDING PMH-9 P38-F

P45-B UNION/ MATT ANNEX PMH-13 P45-A STUDENT UNION PMH-9 P43-B RADIO/TV FILM PMH-9 040-C BUS LEAD BLDG VISTA

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VI. RECOMMENDATIONS AND OPINION OF PROBABLE CONSTRUCTION COST 1. Increase DME service capacity to the Main Campus from existing capacity of 20

MVA to new capacity of 29.1 MVA (minimum). This service capacity is required to serve existing loads and future loads identified in the study. This can be accomplished in several ways and will require strategic planning to minimize the impact to the existing UNT distribution system which is necessary to control construction cost. Possible solutions include:

a. DME to increase service capacity of the four existing DME feeders. Cost for this item would be determined by DME.

b. DME to install additional feeder capacity to the SE Substation area to relieve load on that substation and the associated UNT feeders. These new feeders would then be used to relieve load on the NW substation. This area has the highest concentration of future loads. Cost for this item would be determined by DME.

c. Install a third DME substation in the area of the existing football stadium. The disadvantage of this approach is the distance from the highest concentration of campus load; therefore UNT feeder cost would be higher than other options. The advantage of this approach is available space for incoming DME feeder facilities. Cost for this item would be determined by DME.

d. Provide a true substation on campus to transform from DME transmission voltage to 13.2 KV. A very preliminary range of construction cost for this item is from $2,000,000 to $3,000,000 depending on capacity, location, screening, etc.

e. Each item above requires UNT feeder upgrades, extensions, and switchgear to utilize and distribute the added capacity. Those cost are addressed below and will vary depending on which DME upgrade approach is selected.

2. Install additional UNT feeder facilities to support existing and future loads, and allow for sectionalizing during feeder outage conditions without the need to curtail loads. The approach for this item is dependent on which DME service capacity upgrade option is selected. A preliminary range of cost for this item is $1,000,000 to $2,500,000 depending on the DME service capacity approach selected.

3. UNT feeders should be configured to allow transfer of loads between feeders originating from the same substation and same DME feeder. Currently, transfer of UNT loads from one feeder to another results in transferring loads from one DME feeder to another, making it difficult for DME to control loads on their feeders. It is also a burden to UNT to notify DME each time load is transferred. Emergency ties should still be provided between DME feeders in case of DME feeder loss. Cost of this item will range from $250,000 to $750,000 depending on which DME service capacity approach is selected. 4. That the 4/0 conductor from P10-A to P5-A be replaced with 500KCMIL and

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5. Areas served by radial feeds should be served from the main loop or a sub-loop to improve service reliability. Justification of this item will be on a case by case basis, depending on the facilities served from the radial feed. Cost will be dependent on which radials are selected for conversion to loop feed or alternate feed.

6. Provide a second DME feeder to serve the Eagle Point and Stadium area south of IH-35E. This will allow a phased approach of providing a loop feed or alternate feeds to all or selected facilities in this area. Redundant UNT feeds could be provided to selected facilities without the additional DME feeder, however due to the critical nature of the Stadium, a second DME feeder is recommended. Cost for this item would be determined by DME. UNT feeder cost will be dependent on which facilities are selected for loop feed or alternate feed.