Download Electrical Systems Existing Conditions and Building Load Summary

Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
Electrical Systems Existing Conditions and Building Load Summary Report
EXECUTIVE SUMMARY
The Bahen Centre for Information Technology is one of the best information technology
centers among universities in Canada. It features multiple computer labs feature large
amount or workstations for students, faculty, and research use. Therefore the electrical
system at the Bahen Centre should sufficiently provide power for a technology center that
is filled with computers, equipments, and electronics that handles important data
information. The electrical system must therefore be design to suit the use of the building
while providing flexibility for future changes and be affordable for the owners of the
building. This report will examine the different aspects of the existing electrical system
in the Bahen Centre for Information Technology and provide other information related to
the power usage, distribution, and regulation of this building
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
Electrical Systems Existing Conditions and Building Load Summary Report
System Type
The Bahen Centre for Information Technology features a Primary Selective type
electrical system. The primary system is identified by two supply paths leading from the
primary distribution switchgear. This type of system has the ability to provide a constant
path of power (thus constant power supply) in an event when one feeder is out of service
electrical power because of the two-path structure. The Primary Selective System
increases service reliability, which is very important for this type of building (information
technology) where the use of electricity for computers and machines are extremely
important.
Building Utilization Voltage
Incoming electrical power is provide at 13.8kV, which is then transformed into 347/600V
(Canadian standard) for mechanical equipment and lighting in the building. The power is
then transformed again to 120/208V for receptacles and other power loads.
Transformer Configuration
The first set of transformers in the building is located in the main electrical room near the
service entrance. These transformers (TX-AB and TX-BB) arranged in a delta-Y
configuration are used to transform high voltage (13.8kV) to utilization voltages
(347/600V) for mechanical equipment and lighting. Another set of high voltage
transformers (TX-CHI1/1B and TX-CH2) arranged in a delta-delta configuration
transforms voltages from 13.8kV to 4160V, which are used for the chillers of the
building. Additional transformers are located on each floor of the building that
transforms 600V to 120/208V level for the receptacle and certain lighting equipments.
These transformers are arranged in delta-Y configuration.
*For additional information on transformers, please refer to TRANSFORMER
SCHEDULE attached.
Emergency Power Systems
Emergency lighting in the building are powered by power generated from emergency
generator. However, this information was not available therefore several assumptions
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
will be made. Further information about the Bahen Centre’s emergency power system
has been requested to the University of Toronto contacts.
From the Emergency System Diagram (attached in the back of this report), it appears that
the emergency generator is not located on site and is somehow connected to the power
supply of the four adjacent buildings (Central Power Plant, Fields Institute, Architecture
Building, and the Koffler Students Centre). However, the exact location of this generator
and type of generator is not known and not stated on the diagrams.
Over-current protective devices
Circuit breakers used in the Bahen Centre are mainly located in two locations. One of the
locations is the main electrical room. The transformers in the electrical room transform
power from 13.8kV to 347/600V, which is then distributed through a bus, to feeders
(where the circuit breakers are also located) that feeds to different panels and mechanical
equipment throughout the building. Those circuit breakers are range from 1200A/400A
to 1200A/1200A depending on the equipment it is connected to.
Other circuit breakers are located on each floor after the transformers transforms voltages
from 347/600V to 120/208V. These circuit breakers are all listed as 3 pole - 100A,
150A, or 175A circuit breakers.
Switchgear panel boards and motor control centers
Main switchboards (MS-6AB) and high voltage switchboard “A” are located adjacent to
each other in the main electrical room (room B010) in the basement of the Bahen Centre.
Switchgear CH1/2 is also located in the main electrical room near the south entrance of
the room.
Lighting systems
The lighting used in the Bahen Centre for Information Technology can be generally be
categorized into three types: fluorescent, high intensity discharge, and incandescent.

All the fluorescent fixtures in the building have an operating voltage of 347V.
(The 347V is a Canadian standard, which is slighting different than the common
standards in the United States)
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002



The high intensity discharge fixtures, mostly Metal Halide and some High
Pressure Sodium fixtures, all operates at 347V also.
Exit light fixtures, which are all LED fixture types, operate at 347V.
All Incandescent fixtures operates at 120V
Power factor
Power factor information was not available from the contacts at the moment.
assumption of power factor = 0.90 will be made for the purpose of this report.
An
Important Design requirements
The electrical system of the Bahen Centre for Information Technology should be
designed so that it is a reliable system. A reliable power system is vital to a building that
is mainly for computer use where important electronic data are handled. Any type of
power system failure may cause the loss of those electronic data. There must also be an
adequate amount of power supplied to this building because a high-tech building of this
sort consumes a tremendous amount of power with their high tech equipment, computers
and electronics. Additional power will also be need for cooling and heating a building of
this size (377,000 sq ft) and cooling the heat generated by the electrical equipments.
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
Primary Lamps and ballasts, and mechanical equipment information
The primary types of lamps and ballasts used in the Bahen Centre for Information
Technology are listed in the tables below. Each table lists the type of lamp or ballasts
along with the electrical operating characteristics:
BALLASTS
TYPE
UL Listed
Maximum current
crest factor
THD
1.5
<10%
0.99
>20KHz
-20 deg F
1.5
<10%
0.99
>20KHz
-20 deg F
1.8
1.8
-
0.95
0.95
60Hz
60Hz
-29 deg F
-34 deg C
Electronic Ballast
Rapid Start Fluorescent Class P
(T8 Linear)
Electronic Ballast
Rapid Start Fluorescent Class P
(Compact Lamps)
Metal Halide
High Pressure Sodium
-
Minimum
Starting
Frequency
Power Factor
Temp
Acceptable ballast manufacturers for the Bahen Centre for Information Technology
include:
 Advance
 Alliance
 Ballastronix
 Robertson
 EBT
 Flowtronic
LAMPS
TYPE
Incandescent
Metal Halide
Fluorescent T8
CCT
n/a
3500
3500
HPS
2100
CRI
100
70
85
x=0.512
y=0.42
LIFE
3,000hrs
10,000hrs
20,000hrs
WATTAGE
Varies, depending on luminaire
Varies, depending on luminaire
32W
24,000hrs
100W
Acceptable lamp manufacturers for the Bahen Centre for Information Technology
include:
 Phillips
 Osram-Sylvania
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
The major mechanical equipments are mostly located in the basement mechanical room
(B008) or in the penthouse. Below is a table of all the equipment (with a horsepower of
greater than 75) along with their electrical properties.
Mechanical Equipment (>75hp)
Equipment
Adjusted
Load
Designation
Description
Location
Voltage
Ph
Horse
Power
Amp
(VA)
CWP-1
CONDENSOR WATER CH-1
B008
600
3
75
77
72018.673
CWP-2
CONDENSOR WATER CH-1
B008
600
3
75
77
72018.673
CWP-3
CONDENSOR WATER CH-2
B008
600
3
75
77
72018.673
CWP-4
WATER STANDBY (FUTURE)
B008
600
3
75
77
72018.673
CWP-5
WATER STANDBY (FUTURE)
B008
600
3
75
77
72018.673
CHWP-1
CHILLED WATER CH-1
B008
600
3
75
77
72018.673
CHWP-2
CHILLED WATER CH-1
B008
600
3
75
77
72018.673
CHWP-3
CHILLED WATER CH-2
B008
600
3
75
77
72018.673
CHWP-4
CHILLED WATER STANDBY
B008
600
3
75
77
72018.673
CHWP-5
CHILLED WATER DIST
B008
600
3
75
77
72018.673
CHWP-9
CHILLED WATER DIST
B008
600
3
100
99
92595.436
CHWP-10
CHILLED WATER DIST
B008
600
3
100
99
92595.436
SF-1
AIR HANDLING UNIT #1
PENT.
600
3
75
77
72018.673
SF-2
AIR HANDLING UNIT #2
PENT.
600
3
75
77
72018.673
SF-3
AIR HANDLING UNIT #3
PENT.
600
3
75
77
72018.673
SF-4
AIR HANDLING UNIT #4
PENT.
600
3
75
77
72018.673
SF-5
AIR HANDLING UNIT #5
PENT.
600
3
75
77
72018.673
SF-6
AIR HANDLING UNIT #6
PENT.
600
3
75
77
72018.673
SF-7
AIR HANDLING UNIT #7
PENT.
600
3
75
77
72018.673
RF-5
RETURN FAN #5
PENT.
600
3
100
99
92595.436
RF-6
RETURN FAN #6
PENT.
600
3
100
99
92595.436
CT-1
COOLING TOWER #1
PENT.
600
3
75
77
72018.673
CT-1
COOLING TOWER #1
PENT.
600
3
75
77
72018.673
CT-1
COOLING TOWER #1
PENT.
600
3
75
77
72018.673
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
Building Load
The total building loads were tabulated for the Bahen Centre for Information Technology.
Listed below are the total loads from mechanical, lighting, and receptacle equipments.
For detail information on specific equipment, please refer to tables attached to this report.
Total Mechanical Load: 2302.5 kVA
(See attached table for detail)
Total Receptacle Load: 241.07 kVA
Receptacle Load
Location
P4 - SOUTH SECTOR
P3 - NORTH SECTOR
P3 - SOUTH SECTOR
P2 - NORTH SECTOR
P2 - SOUTH SECTOR
P1 - NORTH SECTOR
P1 - SOUTH SECTOR
BASEMENT NORTH SECTOR
BASEMENT SOUTH SECTOR
1ST FL NORTH SECTOR
1ST FL SOUTH SECTOR
2ND FLOOR
3RD FLOOR
4TH FLOOR
5TH FLOOR
6TH FLOOR
7TH FLOOR
8TH FLOOR
total number of receptacles
multiple by 180VA each
Number of
receptacles
16
5
13
5
15
7
20
279
17
61
85
300
300
300
300
300
300
300
2623
x 180
Receptacle Load (VA)
472140
first 10,000 VA at 100%
Remaining (47,2140-10,000) at
50%
10000
231070
Total computed load (VA)
(kVA)
241070
241.07
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
Total Lighting Load:
(From NEC 1999 Table 220-3(a) General Lighting Load by occupancy)
377,000 sq ft * 3.5VA/sq ft = 1319500 VA = 1319.5 kVA
Demand factor:
(from NEC 1999 Table 220-11)
Demand factor = 100%
Total Building Load: 3863.07kVA
Currently, there is insufficient information available on the building’s main
transformer and feeders which are all located in the “New Building 13.8kV
Switchboard”. Contacts have already been made in an attempt to obtain this
information but there has been no response provided from the engineering contacts.
Therefore, a comparison between the actual sizes of the main building transformer
and feeders will not be available at this moment.
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Rebecca Ho
Lighting/Electrical
AE Faculty Consultant: Dr. Moeck
Bahen Centre for Information Technology
Toronto, Ontario, Canada
October 21st, 2002
Utility Rate Structure and Data:
The electrical power at the Bahen Centre for Information Technology is supplied by
University of Toronto’s own power plant located within the campus. Therefore the utility
rate structure for this building will be dramatically different than the typical utility rate
structure. However, information on the Bahen Centre’s utility rate structure and utility
load data is currently unavailable because contacts at the University of Toronto were
unavailable to provide this information. Resubmission of this report will include these
data if it becomes available.
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