ATTACHMENT 4 - 100 Emergency Analysis Report.pdf

Department of Veterans Affairs

Lake Baldwin – Orlando VA Medical Center

Improve Lake Baldwin Electrical

Distribution

675-23-801 100% Emergency Analysis Report

Contract Number:

36C24819D0022 36C24823N0302

March 1, 2024

Improve Lake Baldwin Electrical Distribution Electrical Analysis

I. Executive Summary The purpose of this is to explore potential solutions and their feasibility that provide generator backed power to the Lake Baldwin campus at large. The existing conditions of the site are outlined and discussed. Four potential solutions were presented to the VA along with their respective equipment, phasing, and operational impacts. One solution was selected, this solution is outlined in this document. A campus wide site plan and one-line diagrams are included as part of this analysis. The drawings and this document complement one another and is intended to be read in conjunction with those drawings.

Neither this report nor the drawings provided are construction documents and are for use by the

VA to determine feasibility, constructability and potential cost to achieve the above stated goal. All existing field conditions stated would need to be field verified prior to producing construction documents pertaining to this scope of work

II. Existing Conditions

Normal Distribution

The Lake Baldwin campus has a 12,470 volt, 3-phase, 3-wire medium voltage (MV) electrical distribution system serving the campus. The system has two (2) incoming utility feeds. One (1) utility feed is located on the north side of the campus and one (1) is located at the south side. The two (2) utility owned MV switches feed MV distribution equipment located at two (2) distinct locations. There are two (2) MV multi-way switches and three (3) MV automatic transfer switches

(ATS) located near building 502 and the green team. One (1) of these multi-way switches is fed from the north utility feed while the other originates from the south.

There are two (1) MV distribution multi-way switches and one (1) MV ATS located near building

3132. The MV ATS receives one feeder from the north and one from the south utilities. In turn, the ATS feeds the MV switch located near building 3132 which then feeds that portion of the campus.

The entire campus distribution system originates from these four (4) ATSs except for the power feeding buildings 506 and 517. These buildings are fed from a single utility source. BLD. 517 is fed solely from the north and BLD. 506 is fed solely from the south. The three (3) MV ATS located near BLD 502 and the green team feed six (6) medium to low voltage (LV) transformers in total. The 4th MV ATS (ATS-NO.4) is located near building 3132 and feeds three (3) MV-LV transformers via a 4-way MV switch. The exact transformers and buildings fed from each ATS are as follows.

MV-ATS-NO-1

• MV-XF-NO.1 (1,000 kVA) o BLD 502 (This building is fed from a series of two (2) 480V ATS’s) o Fire Pump (Via 480V ATS)

• MV-XF-504 (150 kVA) o BLD 504

• MV-XF-513 (300 kVA) o BLD 513

MV-ATS-NO.2

675-22-801 675-23-801

• MV-XF-NO.2 (1,500 kVA) o BLD 500 (SWBD2)

MV-ATS-NO.3

• MV-XF-NO.3 (1,500 KVA)

o BLD 500 (SWBD2) o BLD 502 (Via 480V ATS)

• MV-XF-501 (150 kVA) o BLD 501

MV-ATS-NO.4

• MV-XF-516 (500 kVA) o BLD 519 o BLD 521 o BLD 521 Chiller o BLD 510

• MV-XF-503 (500 kVA) o Non VA State Owned Building

• MV-XF-ENG (300 kVA) o Engineering buildings via overhead lines

▪ BLD 3130

▪ BLD 3130

▪ BLD 3134

▪ BLD 3132

▪ BLD 3133

▪ BLD 3133

▪ BLD 3129

▪ BLD 3128

▪ BLD 3125

▪ BLD 3126

▪ BLD 3126

Medium Voltage Transformers not fed from a MV ATS

Fed solely from OUC South (via MV-MWS-NO.3)

• MV-XF-ADMIN-T2 (500 kVA) o BLD 506

Fed solely from OUC North (via MV-MWS-NO.1)

• MV-XF-517 (150 KVA)

o BLD 517

Buildings 503 and 509 are non-VA, state owned buildings currently fed from the Lake Baldwin VA medium voltage distribution system. These buildings have both normal and emergency power fed from the VA distribution system. There are currently other projects and plans with the goal to remove them from the VA distribution system, however, at this time they must be considered when discussing options for adding generator backed power to the entire system.

Normal Electrical Demand

According to recent energy bills provided by the VA to Aesus Design Group, the utility recorded a peak demand from the entire campus at 1,728 KW. The 12 month peak demand occurred in July, 2022 per the VA provided utility bills from OUC.

Emergency Distribution

The emergency distribution system is powered by three (3) 750 kW 480V, 3-phase, 4-wire generators. The generators feed a 3,000 A, 480Y/277V, 3-phase, 4-wire paralleling switchboard.

Both the generators and paralleling switchboard are located within the central energy plant

(CEP). Generators 1 and 2 were replaced under project 675-13-601 with record documents dated

April 26, 2016. The paralleling switchboard and generator 3 were not replaced under this project.

However, all three (3) generators appear to be in good condition. One (1) of the generators was manufactured in 2013 with the other two (2) being manufactured in 2015.

The paralleling board feeds four (4) loads directly. They ATSs and first level loads from each ATS are as follows:

o 502-ATS-EQ (1,600 A)

▪ BLD 502 Equipment Branch o 502-ATS-A (260 A)

▪ Fire Pump o 502-SWBD-3-EM (400 A)

▪ BLD 500 Elevators 1-4 o 502-SWBD-4 (1,200 A)

▪ 519 ATS-K

▪ 500-ATS-1

▪ 500-ATS-2

▪ 500-ATS-3

• ATS-3 feeds a 500-PNL-C1H1 which in turn feeds 501-ATS-EL1

▪ 500-ATS-4

▪ 500-ATS-5

▪ 500-ATS-6

▪ 500-ATS-7

▪ 500-ATS-8

▪ 500-ATS-C2P5

Buildings 500, 501 and 516 are partially provided with emergency power. Building 502 is completely backed up by emergency generator. The domiciliary building 519 received its emergency feeder through the state owned building 503 and is only partially backed up by emergency power. No other buildings or loads on the campus are currently backed up by emergency generator.

Emergency Electrical Demand

There is no consolidated demand data on the emergency distribution system. Metering and testing would be required at each current ATS to determine the peak load on the emergency distribution system is.

III. Proposed solution The purpose of this analysis is to determine the most cost effective, constructable, least intrusive and efficient way to provide generator backed power to the entire campus. The total generator capacity is 2,250 KW and the current peak demand of the Lake Baldwin campus as stated previously in this report is 1,728 kW. Using all three (3) generators at once there is currently enough generator capacity to provide generator backed power to the entire campus under peak loading. A total of four (4) solutions were created and presented to the VA. One (1) solution was selected and expanded upon as the most cost effective, constructible and least intrusive. Least intrusive is defined here mitigating potential outages required during construction.

The proposed solution outlined here limits the work involved on the campus; it isolates the required work to select portions of the campus; and it leaves the medium voltage system largely intact by achieving the goal of injecting generator backed power at the medium voltage level.

Equipment Summary Demolished Equipment includes:

• MV-MWS-NO.1

• 502-SWBD-EM (Gen Paralleling SWBD)

Proposed New Equipment:

• One (1) 600A medium voltage 6-way switch (12.47kV, 15kV rated)

• One (1) 2,500kVA step up transformer (480-12.47kV)

• One (1) 3,000A Generator Paralleling switchboard. (480/277V)

Solution Description The existing generator paralleling switchboard will be replaced. A new paralleling switchboard would be provided with additional output breakers as well as provisions for connecting additional generators in the future. This would allow for additional capacity as the campus grows.

One (1) of the output breakers would feed the new 2,500 kVA step up transformer. This create a

12,470 V emergency feeder that will be used to inject emergency power at the MV level.

MV-MWS-NO.1 would be demolished and replaced with a new MV 6-way switchgear. This switchgear would have two (2) input breakers and three (4) output breakers. The input breakers would be fed from the north utility feeder and generator backed MV feeder power respectively.

The input breakers would be kirk-keyed or provided with an automatic transfer controller in order to prohibit the possibility of paralleling the utility with the generators.

Transformers MV-XF-ADMIN-T2 and MV-XF-517 would be re-fed from the new MV switchgear.

Pros:

• Minimal equipment demolished.

• Minimal new equipment required.

• Maintains much of the existing MV infrastructure in place.

• Minimum underground work required.

Cons:

• The new MV switchgear and existing ATSs would need to be integrated in order to correctly select the generators in case of an outage. Additional controllers and programming may be required to integrate the new and existing systems. All of this is achievable but would require tight integration between the existing and new systems

• This solution does not address the State-owned building fed from the VA MV distribution system. This still needs to be addressed. One option would be to remove that building from the VA system and provide it with a dedicated service from the utility. Otherwise, the state building would be provided with generator backed power in the event of a utility outage.

Phasing Considerations The normal power construction for option 3 is entirely isolated to the north utility incoming feeder.

The campus could bed fed entirely to the south utility feeder during construction and avoid normal power outages. This would limit the normal power redundancy during construction. The new switchgear and feeders could be installed prior to de-energizing the existing feeders. During the feeder extension and switchover, however, normal power redundancy would be limited.

While the generator paralleling switchboard is being replaced emergency generator power would be unavailable. Portable and temporary generator power could be utilized to maintain emergency backup capabilities for critical, equipment and life safety systems.

Phasing Considerations This option leaves the medium voltage system intact. Buildings and panels could be taken offline one at a time to minimize outages throughout the entire campus.

While the generator paralleling switchboard is being replaced emergency generator power would be unavailable. Portable and temporary generator power could be utilized to maintain emergency backup capabilities for critical, equipment and life safety systems.