APPENDIX E DFO DISTRIBUTION DEFICIENCY REPORT

APPENDIX E
DFO DISTRIBUTION DEFICIENCY REPORT
Contents
1 EXECUTIVE SUMMARY .............................................................................................................................. 2 2 EXISTING DISTRIBUTION AND TRANSMISSION SYSTEM ASSESSMENT ..................................... 3 Figure 2.0-1, Substations in the Vicinity of Load Requests ............................................................................. 3 Table 2.0-1, Distances between Substations and Customer Sites.................................................................... 3 2.1 DOME CUTBANK 810S.............................................................................................................................. 4 Figure 2.1-1 – Simplified SLD of Dome Cutbank 810S................................................................................... 4 2.2 SIMONETTE 733S ...................................................................................................................................... 4 Figure 2.2-1 – Simplified SLD of Simonette 733S ........................................................................................... 4 2.3 EXISTING DISTRIBUTION SYSTEM ............................................................................................................. 5 Figure 2.3-1 – Simplified SLD of Simonette 733S ........................................................................................... 5 3 NEED FOR DEVELOPMENT ........................................................................................................................ 6 Table 3.0-1 – Load Requests ........................................................................................................................... 6 4 ALTERNATIVES ............................................................................................................................................. 6 4.1 ALTERNATIVE 1: SERVE THE LOADS WITH A DISTRIBUTION-BASED SOLUTION ......................................... 7 4.2 ALTERNATIVE 2: UPGRADE EXISTING TRANSFORMER AT SIMONETTE 733S ............................................ 7 Figure 4.2-1 – Simplified SLD of Simonette 733S, Alternative 2 .................................................................... 7 4.3 ALTERNATIVE 3: INSTALL SECOND TRANSFORMER AT SIMONETTE 733S ................................................ 8 Figure 4.3-1 – Simplified SLD of Simonette 733S, Alternative 3 .................................................................... 8 5 RECOMMENDATION .................................................................................................................................... 9 APPENDIX A – LOAD FORECASTS .................................................................................................................... 10 Table A-1 - Dome Cutbank 810S Current Load Forecast excluding requested loads................................... 10 Table A-2 –Simonette 733S Current Load Forecast excluding requested loads ........................................... 10 Table A-3 –Simonette 733S Load Forecast including Requested Loads ....................................................... 11 Table A-4 – Simonette 733S Alternative 2 Load Forecast............................................................................. 11 Table A-5 – Simonette 733S Alternative 3 Load Forecast............................................................................. 11 Revision History:
R0
Original
R1
Implement comments
R2
Implementing AESO DDR
Author’s Guide
R3
Implement AESO Comments
Erin Ebbers
Julian Tong
Sonya Wallbank
Septemper 16, 2014
February 9, 2015
September 11, 2015
Matt Sv.
November 4, 2015
1
1 Executive Summary
Simonette 733S is located approximately 60 km west of the Town of Fox Creek. This
POD has a single 10/13 MVA, 144 – 25 kV transformer. ATCO Electric Distribution
Division (AE DFO) has received requests for approximately 7.1 MW of new load in the
Simonette area. Substation loading is forecast to exceed the nameplate rating of the
transformer in 2015.
To serve the requested loads, AE DFO has considered the following Distribution
alternative:
Alternative 1
Serve the loads with a distribution-based solution
AE DFO also considered the following Transmission alternatives:
Alternative 2
Upgrade Existing Transformer at Simonette 733S
Alternative 3
Install Second Transformer at Simonette 733S
Based on the analysis outlined in this report, a distribution based solution cannot serve
these requests. Both Alternative 2 and Alternative 3 are technically acceptable. AE DFO
prefers Alternative 2 to address the distribution deficiency.
The requested in-service date (ISD) for this upgrade is December 31, 2016.
2
2 Existing Distribution and Transmission System
Assessment
Figure 2.0-1 shows the existing Transmission system near the load requests. The
closest substations to the customer sites are Simonette 733S and Dome Cutbank 810S.
Distances between each substation and customer site are provided in Table 2.0-1.
Kakwa Ridge 857S was not considered because it is not a distribution POD.
Figure 2.0-1, Substations in the Vicinity of Load Requests
Table 2.0-1, Distances between Substations and Customer Sites
Site
Site #1
Site #2
Site #3
Total Requested
Load
4.3 MW
2.6 MW
0.2 MW
Distance from
Simonette 733S
31 km
11 km
13 km
3
Distance from Dome
Cutbank 810S
42 km
80 km
82 km
2.1
Dome Cutbank 810S
Table A-1, in Appendix A, shows the load forecast for Dome Cutbank 810S with existing
customer loading and forecasts. The simplified single-line diagram (SLD) is shown in
Figure 2.1-1.
Figure 2.1-1 – Simplified SLD of Dome Cutbank 810S
2.2
Simonette 733S
Simonette 733S has one 10/13 MVA 144/25 kV transformer (702T) and one 10/13 MVA
voltage regulator (502VR). Figure 2.2-1 shows the simplified SLD for Simonette 733S.
Table A-2, in Appendix A, shows the load forecast for Simonette 733S with existing
customer loading and forecasts.
Figure 2.2-1 – Simplified SLD of Simonette 733S
4
2.3
Existing Distribution System
All sites identified in Table 2.0-1 are within the existing Simonette 733S distribution
system. Figure 2.3-1 shows the distribution system configuration emanating from
Simonette 733S. No interconnections to other distribution systems exist.
Figure 2.3-1 – Simplified SLD of Simonette 733S
Industrial sites constitute 97.3% of the load at Simonette 733S, with the remaining 2.7%
of load being residential and commercial. Critical load is defined as all non-industrial
loads, as well as 10% of industrial load (to allow for basic heating and lighting in a
contingency scenario). Using this definition, the critical load served from Simonette
733S is calculated to be 12% of the current substation loading.
In the event of a POD transformer contingency at Simonette 733S, there is currently no
capability to serve critical load. AE DFO does not deem this critical load as a deficiency
and this is not driving the need for development.
5
3 Need for Development
The need for development at Simonette 733S is driven by new customer load additions
and existing customer load increase requests.
AE DFO has received multiple industrial load requests near Simonette 733S. Table 3.01 summarizes these requests.
Table 3.0-1 – Load Requests
Site
Site #1
LSD
1-21-63-2-W6M
Site #2
5-31-62-24-W5M
Site #3
1-16-63-24-W5M
Load Description
Liquid Transfer
Gas Plant Expansion
Site Expansion
Site Expansion
Pump
Total
Requested Load
0.6 MW
3.7 MW
1.1 MW
1.5 MW
0.2 MW
7.1 MW
Requested ISD
Q3 2014
Q4 2015
Q2 2014
Q3 2014
Q4 2014
No major distribution system development is required to connect the load requests to
the Simonette 733S distribution system. Table A-3, in Appendix A, shows the load
forecast for Simonette 733S after connecting all load requests shown in Table 3.0-1. In
2015, the loading at the POD exceeds the total nameplate capacity of transformer 702T
and voltage regulator 502VR.
Due to this identified deficiency, alternatives have been evaluated to serve the load
requests.
4 Alternatives
The following alternatives were considered and are described in Sections 4.1, 4.2, and
4.3.
Distribution alternative:
Alternative 1
Serve the loads with a distribution-based solution
Transmission alternatives:
Alternative 2
Upgrade Existing Transformer at Simonette 733S
Alternative 3
Install Second Transformer at Simonette 733S
6
4.1 Alternative 1: Serve the loads with a distribution-based solution
A. Load Shifting
Dome Cutbank 810S is the nearest adjacent POD to the Simonette 733S distribution
system. AE DFO investigated shifting load from Simonette feeder 5L175 to Dome
Cutbank’s distribution system, in order to serve the requested loads identified in Table
3.0-1.
Shifting feeder 5L175’s load to Dome Cutbank 810S would involve constructing
approximately 42 km of 25 kV distribution line. AE DFO modelled this scenario in a load
flow simulation. Minimum acceptable voltage levels (0.97 Vpu) cannot be obtained at
Site #1 in this scenario. Distribution line lengths are too long to support any load
shifting. This alternative is not technically feasible and has been rejected. No further
analysis was completed.
4.2 Alternative 2: Upgrade Existing Transformer at Simonette 733S
Alternative 2 involves increasing the POD capacity at Simonette 733S by replacing the
existing 10/13 MVA transformer and 10/13 MVA voltage regulator with a larger capacity
unit.
The assumed transmission development at 733S Simonette substation may include:




Discontinuing use of the existing 10/13 MVA transformer;
Discontinuing use of the existing 10/13 MVA voltage regulator;
Installing one (1) 30/40/50 MVA, 144-25 kV LTC transformer; and
Installing associated protection and metering.
Figure 4.2-1 – Simplified SLD of Simonette 733S, Alternative 2
7L80
H.R. Milner
701
7L80D1
701A
503
5L283
503A
702TCS
7L40
Little Smoky
702T
30/40/50 MVA
702
H
7L40D1
702A
500D4
N.O.
502
X
502TD
5L175
502A
500D6
500D3
N.O.
501
5L390
501A
Legend
ATCO Electric
Development
701TD
N.O.
4.2.1 Assessment
After the assumed transmission development is completed, the POD capacity at
Simonette 733S will increase by 37 MVA. A load forecast is shown in Table A-4, in
Appendix A. The upgraded transformer will provide adequate capacity for the requested
7
loads as well as for load growth in the area for the foreseeable future. As described in
Section 2.3, the critical load at Simonette 733S is not the driver of the need for
development; therefore, the redundancy offered by installation of a second transformer
is not required. This alternative is technically acceptable.
4.3 Alternative 3: Install Second Transformer at Simonette 733S
Alternative 3 involves increasing the POD capacity at Simonette 733S by installing a
second transformer at Simonette 733S.
The assumed transmission development at 733S Simonette substation may include:






Installing one (1) new 30/40/50 MVA LTC transformer;
Installing one (1) new 144 kV breaker and associated disconnect switch;
Installing one (1) 144 kV motorized disconnect switch;
Installing one (1) 25 kV motorized disconnect switches;
Installing associated protection and metering; and
Changing 500D6 to be a normally open switch.
Figure 4.3-1 – Simplified SLD of Simonette 733S, Alternative 3
703T
30/40/50 MVA
7L80
H.R. Milner
144 kV
701
7L80D1
703
701A
H
M
503
X
500D4
N.O.
502VR
10/13 MVA
700D1
502
702TCS
702T
10/13 MVA
500D3
N.O.
501
702
7L40D1
5L175
502A
M
7L40
Little Smoky
144 kV
5L283
503A
503TD
703TD
702A
502TD
500D6
N.O.
5L390
501A
Legend
ATCO Electric
Development
701TD
N.O.
4.3.1 Assessment
After the assumed transmission development is completed, the POD capacity at
Simonette 733S will increase by 50 MVA. A load forecast is shown in Table A-5, in
Appendix A. The second transformer will provide adequate capacity for the requested
loads as well as for load growth in the area for the foreseeable future. This alternative is
technically acceptable.
8
5 Recommendation
Both Alternative 2 and Alternative 3 are technically acceptable from a distribution
standpoint. AE DFO prefers Alternative 2 to address the capacity concerns at Simonette
733S for the following reasons:

The redundancy offered by installation of a second transformer is not required,
and

Alternative 2 is assumed to require less transmission development compared to
Alternative 3.
The requested in-service date (ISD) for this upgrade is December 31, 2016.
9
Appendix A – Load Forecasts
Table A-1 - Dome Cutbank 810S Current Load Forecast excluding requested loads
Existing System
Sub No.
810S
810S
Feeder
Dome Cutbank
5L318
5L724
Total Station
Capacity
701T/702T
20/26 MVA
PF
92%
94%
90%
92%
Peak
MW
2010
9.8
10.0
0.0
9.8
Peak
MW
2011
18.2
9.8
9.7
18.2
Recorded
Peak
MW
2012
19.6
10.1
10.5
19.6
Peak
MW
2013
21.1
9.9
12.0
21.1
Peak
MW
2014
21.2
10.0
12.8
21.2
Peak
MW
2015
22.9
10.2
14.4
22.9
Peak
MW
2016
23.4
10.6
14.6
23.4
Peak
MW
2017
23.6
10.7
14.7
23.6
Peak
MW
2018
23.8
10.8
14.8
23.8
Peak
MW
2019
24.1
10.9
15.0
24.1
Predicted
Peak
MW
2020
24.3
11.0
15.1
24.3
Peak
MW
2021
24.5
11.1
15.2
24.5
Peak
MW
2022
24.7
11.2
15.3
24.7
Peak
MW
2023
24.9
11.3
15.5
24.9
Peak
MW
2024
25.1
11.4
15.6
25.1
Peak
MW
2025
25.3
11.5
15.7
25.3
Notes:
A feeder coincidence factor of 0.93 was applied to the feeders
Tranformer capacity violations
Capacity constraints at Dome Cutbank 810S are being addressed under AESO project 1634
Table A-2 –Simonette 733S Current Load Forecast excluding requested loads
Existing System
Sub No.
733S
733S
Feeder
Simonette
5L390
5L175
5L283
Total Station
Capacity
702T
10/13 MVA
PF
96%
92%
90%
98%
96%
Peak
MW
2010
7.3
1.1
4.6
1.5
7.3
Peak
MW
2011
8.1
1.1
5.0
1.6
8.1
Recorded
Peak
MW
2012
8.4
1.2
5.5
2.0
8.4
Peak
MW
2013
9.4
1.2
5.6
3.1
9.4
Peak
MW
2014
11.2
1.2
6.7
4.0
11.2
Peak
MW
2015
11.2
1.2
6.7
4.0
11.2
Notes:
A coincidence factor of 0.94 was applied to the feeders
Transformer capacity violations
10
Peak
MW
2016
11.2
1.2
6.7
4.0
11.2
Peak
MW
2017
11.2
1.2
6.7
4.0
11.2
Peak
MW
2018
11.2
1.2
6.7
4.0
11.2
Predicted
Peak
Peak
MW
MW
2019
2020
11.2
11.2
1.2
1.2
6.7
6.7
4.0
4.0
11.2
11.2
Peak
MW
2021
11.2
1.2
6.7
4.0
11.2
Peak
MW
2022
11.2
1.2
6.7
4.0
11.2
Peak
MW
2023
11.2
1.2
6.7
4.0
11.2
Peak
MW
2024
11.2
1.2
6.7
4.0
11.2
Table A-3 –Simonette 733S Load Forecast including Requested Loads
Sub No.
733S
733S
Feeder
Simonette
5L390
5L175
5L283
Total Station
Capacity
702T
10/13 MVA
Peak
MW
2010
7.3
1.1
4.6
1.5
7.3
PF
96%
92%
90%
98%
96%
Peak
MW
2011
8.1
1.1
5.0
1.6
8.1
Recorded
Peak
MW
2012
8.4
1.2
5.5
2.0
8.4
Peak
MW
2013
9.4
1.2
5.6
3.1
9.4
Peak
MW
2014
11.2
1.2
6.7
4.0
11.2
Peak
MW
2015
14.4
1.2
9.5
4.6
14.4
Peak
MW
2016
17.8
1.2
9.5
8.3
17.8
Peak
MW
2017
17.8
1.2
9.5
8.3
17.8
Peak
MW
2018
17.8
1.2
9.5
8.3
17.8
Predicted
Peak
Peak
MW
MW
2019
2020
17.8
17.8
1.2
1.2
9.5
9.5
8.3
8.3
17.8
17.8
Peak
MW
2021
17.8
1.2
9.5
8.3
17.8
Peak
MW
2022
17.8
1.2
9.5
8.3
17.8
Peak
MW
2023
17.8
1.2
9.5
8.3
17.8
Peak
MW
2024
17.8
1.2
9.5
8.3
17.8
Peak
MW
2023
17.8
1.2
9.5
8.3
17.8
Peak
MW
2024
17.8
1.2
9.5
8.3
17.8
Notes:
Transformer capacity violations
A coincidence factor of 0.94 was applied to the feeders
Table A-4 – Simonette 733S Alternative 2 Load Forecast
Sub No.
733S
733S
Feeder
Simonette
5L390
5L175
5L283
Total Station
Capacity
702T
30/40/50 MVA
PF
96%
92%
90%
98%
96%
Peak
MW
2010
7.3
1.1
4.6
1.5
7.3
Peak
MW
2011
8.1
1.1
5.0
1.6
8.1
Recorded
Peak
MW
2012
8.4
1.2
5.5
2.0
8.4
Peak
MW
2013
9.4
1.2
5.6
3.1
9.4
Peak
MW
2014
11.2
1.2
6.7
4.0
11.2
Peak
MW
2015
14.4
1.2
9.5
4.6
14.4
Peak
MW
2016
17.8
1.2
9.5
8.3
17.8
Peak
MW
2017
17.8
1.2
9.5
8.3
17.8
Peak
MW
2018
17.8
1.2
9.5
8.3
17.8
Predicted
Peak
Peak
MW
MW
2019
2020
17.8
17.8
1.2
1.2
9.5
9.5
8.3
8.3
17.8
17.8
Peak
MW
2021
17.8
1.2
9.5
8.3
17.8
Peak
MW
2022
17.8
1.2
9.5
8.3
17.8
Notes:
Transformer capacity violations
A coincidence factor of 0.94 was applied to the feeders
A new transformer would take approximately 3 years to be ordered and installed. This load forecast assumes that a new transformer will be installed for 2016.
Table A-5 – Simonette 733S Alternative 3 Load Forecast
Recorded
Sub No.
733S
Feeder
Simonette
733S
Simonette
5L390
5L175
5L283
Total Station
733S
Capacity
702T
10/13
703T
30/40/50 MVA
PF
96%
96%
92%
90%
98%
96%
Predicted
Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW Peak MW
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
7.3
8.1
8.4
9.4
11.2
14.4
17.8
1.1
4.6
1.5
7.3
1.1
5.0
1.6
8.1
1.2
5.5
2.0
8.4
1.2
5.6
3.1
9.4
1.2
6.7
4.0
11.2
1.2
9.5
4.6
14.4
1.2
9.5
8.3
17.8
17.8
1.2
9.5
8.3
17.8
17.8
1.2
9.5
8.3
17.8
Notes:
Transformer capacity violations
A coincidence factor of 0.94 was applied to the feeders
A new transformer would take approximately 3 years to be ordered and installed. This load forecast assumes that a new transformer will be installed for 2016.
11
17.8
1.2
9.5
8.3
17.8
17.8
1.2
9.5
8.3
17.8
17.8
1.2
9.5
8.3
17.8
17.8
1.2
9.5
8.3
17.8
17.8
1.2
9.5
8.3
17.8
17.8
1.2
9.5
8.3
17.8