ELECTRICAL DISTRIBUTION STUDY

Transcription

1 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 ON JUNE 17, YAGGI ENGINEERING, INC W. I-20, Suite 270 Arlington, Texas / fax YEI Project No Texas Registration No. F-9622

2 TABLE OF CONTENTS I. PURPOSE AND SCOPE II. III. EXECUTIVE SUMMARY 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 VI. RECOMMENDATIONS AND OPINION OF PROBABLE CONSTRUCTION COST

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4 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. Yaggi Engineering, Inc.

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6 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. Yaggi Engineering, Inc.

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8 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 The same information is provided for Eagle Point for 2008 and 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. Yaggi Engineering, Inc.

9 EXISTING BUILDING PEAK LOADS Building 3 Year Peak Date KW ART BLDG AUGUST AUDITORIUM-ENGLISH BLDG FEBRUARY BAIN HALL APRIL BRADLEY ST APARTMENTS APRIL BRUCE HALL JANUARY BUSINESS ADMIN BLDG JANUARY BUS LEADERSHIP BUILDING JANUARY CHEMISTRY BLDG AUGUST CHESTNUT HALL JULY CHILTON HALL NOVEMBER CLARK HALL SEPTEMBER COLISEUM JUNE CRUMLEY HALL SEPTEMBER CURRY HALL OCTOBER EAGLE STUDENT SERVICES JUNE ENVIR SCIENCE BLDG FEBRUARY FACILITIES COMPLEX APRIL

10 EXISTING BUILDING PEAK LOADS Building 3 Year Peak Date KW GATEWAY CENTER FEBRUARY GAB AUGUST GAB CITC NORTH AUGUST GOOLSBY CHAPEL JUNE HICKORY HALL & ACCELERATOR SEPTEMBER HIGH MAST LIGHTS MARCH HONORS HALL JANUARY HURLEY ADMIN BLDG APRIL ISB APRIL ISB CC APRIL INTRAMURAL FIELD SEPTEMBER KEN BAHNSEN GYM JANUARY KERR HALL AUGUST LANGUAGE BLDG SEPTEMBER LEGENDS HALL JULY LIFE SCIENCES BUILDING "A" SEPTEMBER LIFE SCIENCES BUILDING "B" OCTOBER MAPLE STREET HALL SEPTEMBER MARQUIS HALL FEBRUARY MATTHEWS HALL FEBRUARY MATTHEWS HALL ANNEX SEPTEMBER

11 EXISTING BUILDING PEAK LOADS Building 3 Year Peak Date KW MCCONNELL HALL FEBRUARY MOZART SQUARE HALL SEPTEMBER MUSIC ANNEX MARCH MUSIC BLDG AUGUST MUSIC PRACTICE COMPLEX JULY PARKING GARAGE APRIL PERFORMING ARTS ANNEX JUNE PERFORMING ARTS CENTER JULY PHYSICAL EDUCATION BLDG NOVEMBER PHYSICS BLDG SEPTEMBER POWER PLANT FEBRUARY RADIO,TV, FILM & PERF ARTS FEBRUARY RESIDENCE HALL ASSOCIATION JULY SANTA FE SQUARE HALL APRIL SCIENCE RESEARCH BLDG FEBRUARY SCOULAR HALL FEBRUARY STADIUM METER NOT OPERATIONAL 35 STADIUM COMPLEX SEPTEMBER

12 EXISTING BUILDING PEAK LOADS Building 3 Year Peak Date KW STOVALL HALL FEBRUARY STUDENT REC CENTER SEPTEMBER TERRILL HALL JUNE TRADITIONS FIELDS - ALL FEBRUARY TRADITIONS HALL SEPTEMBER UNIVERSITY SERVICES BLDG AUGUST UNIVERSITY UNION OCTOBER WEST HALL SEPTEMBER WILLIS LIBRARY SEPTEMBER WOOTEN HALL JANUARY

13 EXISTING EAGLE POINT BUILDING PEAK LOADS BUILDING 2 Year Peak Date KW DUCK POND AUGUST E.P. ATHLETIC CENTER JUNE E.P. INTRAMURAL REC SPORTS DECEMBER E.P. UTILITY BLDG. APRIL E,P. VICTORY HALL APRIL E.P. WARANCH TENNIS COMPLX NOVEMBER MEAN GREEN VILLAGE AUGUST MGV BLDG L-POLICE K9 UNIT DECEMBER MGV BLDG P UNIV COMM & MKT JUNE MGV - WOMENS SOFTBALL FLD MARCH

14 EXISTING BUILDING PEAK LOADS (UNT FEEDER 1A) PEAK PEAK PEAK KW BLDG WATTS/ LOAD BUILDING NAME DEMAND SQ. FT. SQ. FT. AMPS BAIN HALL CHESTNUT HALL CHILTON HALL COLISEUM HURLEY ADMINISTRATION BLDG KEN BAHNSEN GYM MUSIC PRACTICE COMPLEX PHYSICAL EDUCATION BLDG SANTA FE SQUARE HALL STUDENT RECREATION CENTER TRADITIONS HALL CALCULATED MAXIMUM DEMAND TOTAL

15 EXISTING BUILDING PEAK LOADS (UNT FEEDER 1B) PEAK PEAK PEAK KW BLDG WATTS/ LOAD BUILDING NAME DEMAND SQ. FT. SQ. FT. AMPS FACILITIES COMPLEX WEST HALL CALCULATED MAXIMUM DEMAND TOTAL

16 EXISTING BUILDING PEAK LOADS (UNT FEEDER 2) PEAK PEAK PEAK KW BLDG WATTS/ LOAD BUILDING NAME DEMAND SQ. FT. SQ. FT. AMPS AUDITORIUM BRUCE HALL BUSINESS ADMINISTRATION BLDG CHEMISTRY BLDG ENVIRONMENTAL SCIENCE BLDG GAB & GAB CITC NORTH ( ) HICKORY HALL ISB & ISBCC ( ) LANGUAGE BLDG LEGENDS HALL LIFE SCIENCES BLDG "A" & "B"( ) MARQUIS HALL MCCONNELL HALL POWER PLANT SCIENCE RESEARCH BLDG TERRILL HALL CALCULATED MAXIMUM DEMAND TOTAL

17 EXISTING BUILDING PEAK LOADS (UNT FEEDER 3) PEAK PEAK PEAK KW BLDG WATTS/ LOAD BUILDING NAME DEMAND SQ. FT. SQ. FT. AMPS CLARK HALL CRUMLEY HALL GATEWAY CENTER GOOLSBY CHAPEL HONORS HALL KERR HALL MAPLE STREET HALL MATTHEWS HALL MOZART SQUARE HALL MUSIC ANNEX MUSIC BLDG PERFORMING ARTS ANNEX PERFORMING ARTS CENTER RES. HALL ASSOC. & HIGH MAST LITES SCOULAR HALL STADIUM (METER NOT WORKING) STADIUM COMPLEX STOVALL HALL UNIVERSITY SERVICES BLDG WILLIS LIBRARY CALCULATED MAXIMUM DEMAND TOTAL

18 EXISTING BUILDING PEAK LOADS (UNT FEEDER 4A) PEAK PEAK PEAK KW BLDG WATTS/ LOAD BUILDING NAME DEMAND SQ. FT. SQ. FT. AMPS ART BLDG CURRY HALL EAGLE STUDENT SERVICES CENTER MATTHEWS HALL ANNEX PARKING GARAGE PHYSICS BLDG POWER PLANT RADIO,TV, FILM & PERFORMING ARTS UNIVERSITY UNION WOOTEN HALL CALCULATED MAXIMUM DEMAND TOTAL

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20 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 o DME Recorded Max Demand 1.5 MVA Yaggi Engineering, Inc.

21 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 DME-L233 DME-HK214 DME-HK222 Existing 78% (DME Demand) 98% (Calculated) w/ Future 248% (DME Demand) 268% (Calculated) Existing 98% (DME Demand) 120% (Calculated) w/ Future 118% (DME Demand) 140% (Calculated) Existing 86% (DME Demand) 120% (Calculated) w/ Future 86% (DME Demand) 120% (Calculated) 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 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) Yaggi Engineering, Inc. 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.

22 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 UNT Feeder Loading Summary (Eagle Point) 80% (Calculated no load history) 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. Yaggi Engineering, Inc.

23 DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER DME EMERGENCY LOADING PER DME FEEDER UNT FEEDER RATING (500 CU) FEEDER LOAD FLOW ANALYSIS - EXISTING (NORMAL CONDITIONS) 219 AMPS 394 AMPS 465 AMPS DME RECORDED MAXIMUM DEMAND DME UNT MVA AMPS TOTAL AMPS DIVERSITY FACTOR AMPS MVA 1A HK % B HK CALCULATED UNT FEEDER MAX DEMAND % MVA 9 MVA 10.6 MVA L % L211 4A %

24 DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER DME EMERGENCY LOADING PER DME FEEDER UNT FEEDER RATING (500 CU) 219 AMPS 394 AMPS 465 AMPS DME UNT MVA AMPS TOTAL AMPS DIVERITY FACTOR AMPS MVA 1A HK % B HK222 FEEDER L L211 4A 4.9 LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #1A) CALCULATED UNT FEEDER MAX DEMAND % % % NOTE: TRANSFER UNT #1A LOAD OF 5.0 MVA TO UNT #3. DME RECORDED MAXIMUM DEMAND 80% MVA 9 MVA 10.6 MVA

25 DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER DME EMERGENCY LOADING PER DME FEEDER UNT FEEDER RATING (500 CU) FEEDER LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #2) DME UNT MVA AMPS TOTAL AMPS DIVERITY FACTOR 1A HK % 1B HK222 2 CALCULATED UNT FEEDER MAX DEMAND % 219 AMPS 394 AMPS 465 AMPS DME RECORDED MAXIMUM DEMAND AMPS MVA 9 MVA 10.6 MVA MVA L % 215 L211 4A % % 284 NOTE: TRANSFER UNT #2 LOAD OF 9.8 MVA TO UNT #4A

26 LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #3) DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER DME EMERGENCY LOADING PER DME FEEDER UNT FEEDER RATING (500 CU) FEEDER CALCULATED UNT FEEDER MAX DEMAND 219 AMPS 394 AMPS 465 AMPS DME UNT MVA AMPS TOTAL AMPS DIVERITY FACTOR AMPS % 155 1A HK % B % 31 HK % DME RECORDED MAXIMUM DEMAND MVA 9 MVA 10.6 MVA MVA L % L211 4A % NOTE: TRANSFER UNT #3 LOAD OF 6.0 MVA TO UNT #1A

27 DME RECOMMENDED MAX NORMAL LOADING PER DME FEEDER DME EMERGENCY LOADING FOR DME FEEDERS UNT FEEDER RATING (500 CU) FEEDER 219 AMPS 394 AMPS 465 AMPS DME UNT MVA AMPS TOTAL AMPS DIVERITY FACTOR AMPS MVA 1A HK % B HK % % 172 L LOAD FLOW ANALYSIS - EXISTING (OUTAGE FEEDER #4A) CALCULATED UNT FEEDER MAX DEMAND MVA 9 MVA 10.6 AMPS DME RECORDED MAXIMUM DEMAND 82% L211 4A % NOTE: TRANSFER UNT #4A LOAD OF 4.9 MVA TO UNT #2

28 SE SUBSTATION LOAD FEEDER TOTAL TOTAL AMPS MVA DESCRIPTION DME UNT AMPS MVA EXISTING LOAD L211 4A EXIST BUSINESS LEADERSHIP BLDG L211 4B APR POWER PLANT AND GARAGE L211 4B JAN POWER PLANT CHILLERS (2) L211 4B APR AUDITORIUM L211 4B SUBTOTAL L EXISTING LOAD L EXIST CELL TOWER L SUBTOTAL L TOTAL (SE SUBSTATION) NW SUBSTATION LOAD FEEDER TOTAL TOTAL AMPS MVA DESCRIPTION DME UNT AMPS MVA EXISTING LOAD HK EXIST FUTURE LOAD HK222 2 SUBTOTAL HK EXISTING LOAD HK214 1A/1B EXIST FUTURE LOAD LOAD FLOW ANALYSIS - EXISTING PLUS FUTURE (NORMAL CONDITIONS) HK214 1A/1B SUBTOTAL HK214 1A/1B TOTAL (NW SUBSTATION) TOTAL MAIN CAMPUS AMPS MVA DATE DATE

29 LOAD FLOW ANALYSIS - EXISTING PLUS FUTURE (NORMAL CONDITIONS) EAGLE POINT LOAD FEEDER TOTAL TOTAL AMPS MVA DATE DESCRIPTION DME UNT AMPS MVA EXISTING LOAD RD222 EP EXIST STADIUM RD222 EP JUL CHILLER RD222 EP JUL STUDENT HOUSING RD222 EP TOTAL EAGLE POINT AMPS MVA

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31 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 Outage Feeder #4A P45-A, P46A, Feeder #4A Sub Exit 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. Yaggi Engineering, Inc.

32 13.2 KV SWITCHGEAR UNT Device Building Number Location Type *Fuse Serves P5-A P6-B P6-C P7-A P10-A STADIUM & USB STUDENT REC. FAC & WEST HALL TRADITIONS & SANTA ATHLETICS PMH-9 PMH-9 PMH-9 PMH-9 PMH-12 80A 200A 30A 80A 100A STADIUM 2400Y P7-A WEST HALL TRADITIONS STADIUM AND USB 65A 100A 20A 80A 20A USB STUDENT REC. FACILITIES SANTA FE ATHELETICS P12-A PAC ANNEX PMH-9 125A (2) PMH DEVICES 15A PAC ANNEX P12.5-A LEGENDS VISTA 85A LEGENDS P12-B PERF ARTS CNTR PMH-9 150A PAC 150A (3) PMH DEVICES P17-A GATEWAY PMH-9 50A GATEWAY 200A (4) PMH DEVICES P17-B COLISEUM PMH-9 175A COLISEUM P18-A MOZART HALL PMH-9 40A MOZART P19-A ENVIR.SCI. EESAT PMH-9 65A ENVIR SCIENCE P21-A McCONNELL PMH-9 65A McCONNELL P22-A PHYS ED BLDG PMH A PHYS ED BLDG P22-B CHILTON HALL PMH-9 30A CHILTON P22-C CHESTNUT HALL VISTA 100A CHESTNUT P23-A MUSIC PRACTICE PMH-9 40A MUSIC PRACTICE P23-B BAIN & KEN BAHN GYM PMH-9 40A BAIN 20A BAHNSEN GYM P26-A CLARK & HONORS PMH-9 65A CLARK 50A HONORS * DATA OBTAINED FROM UNT RECORDS.

33 13.2 KV SWITCHGEAR UNT Device Building Number Location Type *Fuse Serves P28-A SCIENCE RESEARCH PMH-9 100A SCI. RES. 80A PMH DEVICE P19-A P28-B TERRILL & CHEM PMH-9 125A CHEMISTRY 65A TERR & MARQ P29-A BRUCE PMH-9 100A PMH DEVICE P28-C 30A BRUCE P29-B LIFE SCIENCE VISTA P29-C P30-B P32-A P32-B P36-A P36-B BIOLOGY ADMINISTRATION LIBRARY MUSIC BUILDING KERR MAPLE PMH-9 PMH-9 PMH-9 PMH-10 P33-A STOVALL/SCOULAR PMH-12 P33-C EAGLE STUDENT SER PMH-9 P34-A P34-B N.E. COR.CRUMLEY CRUMLEY/ MUSIC ANN PMH-13 PMH-9 P34-C RES.HALL ASSOC. PMH-9 PMH-9 PMH-9 P37-A HICKORY PMH-9 P37-B GAB CITC NORTH PMH-9 P38-A I.S.B. PMH-11 P38-B BUSINESS & I.S.B. PMH-9 * DATA OBTAINED FROM UNT RECORDS.?? LIFE SCIENCE 65A BIOLOGY 120/208V 50A BIOLOGY 277/480V 40A 175A 65A (2)15A 80A 40A 20A 5A 175A 50A 65A 40A 65A 50A 40A 15A ADMIN. BLDG LIBRARY MUSIC BUILDING MUSIC BUILDING MATTHEWS STOVALL & SCOULAR STUDENT SER CRUMLEY MUSIC ANNEX RES HALL ASSOC KERR MAPLE HICKORY ACCEL HICKORY HALL GAB CITC NOR. I.S.B. BUSINESS AD I.S.B. COMPUTER

34 13.2 KV SWITCHGEAR UNT Device Building Number Location Type *Fuse Serves P38-C POWER PLANT PMH-9 175A POWER PLANT 10A POWER PLANT P38-D POWER PLANT PMH-9 175A POWER PLANT P38-E GAB PMH-7 50A GAB 50A GAB P38-F LANGUAGE PMH-9 50A LANGUAGE 15A AUDITORIUM P38-G CURRY & PHYSICS PMH-9 40A PHYSICS 20A CURRY 040-C BUS LEAD BLDG VISTA?? PMH DEVICE P33-A P43-A ART BUILDING PMH-9 50A ART BUILDING P43-B RADIO/TV FILM PMH-9 40A RADIO/TV P45-A STUDENT UNION PMH-9 200A PMH DEVICE P33-C 100A STUDENT UNION P45-B UNION/ MATT ANNEX PMH-13 P45-C MATTHEWS ANNEX PMH-9 P46-A WOOTEN HALL PMH-9 * DATA OBTAINED FROM UNT RECORDS. 15A 50A MATT ANNEX WOOTEN HALL

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36 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 that P5-A be replaced with VISTA switchgear. Yaggi Engineering, Inc.

37 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. Yaggi Engineering, Inc.