Information Document Northeast Area Transmission Constraint Management ID# 2011-008(R)

Information Document
Northeast Area Transmission Constraint Management
ID# 2011-008(R)
Information documents are for information purposes only and are intended to provide guidance. In the event of any
discrepancy between the information document and the related authoritative document(s) in effect, the authoritative
document(s) governs. Please submit any questions or comments regarding this information document to
[email protected].
1
Purpose
The AESO issues information documents and interpretations regarding certain subject matter set out in
the AESO’s authoritative documents. The purpose of this information document is to provide additional
information regarding the unique operating characteristics and resulting constraint conditions and limits in
the northeast area of the Alberta interconnected electric system. In this information document the AESO
has defined the northeast area as the area illustrated by the maps in Appendix 2 and 3.
2
Related Authoritative Documents
The AESO’s authoritative documents consist of the ISO rules, the ISO tariff and the Alberta Reliability
Standards. Authoritative documents contain binding rights, requirements and obligations for market
participants and the AESO. Market participants and the AESO are required to comply with provisions set
out in authoritative documents.
The AESO encourages market participants to review the authoritative documents related to this
information document which include:
(1) Section 302.1 of the ISO rules, Real Time Transmission Constraint Management
This section of the ISO rules sets out the general transmission constraint management protocol steps the
AESO uses to manage constraints in real time on the interconnected electric system. These steps are
referenced in Table 1 of this information document as they are applied to the northeast area.
3
General
The northeast area is connected to the interconnected electric system by three (3) long 240 kV bulk
transmission line paths (9L07/9L55/9L22, 9L57/9L10/9L56, and 9L23/9L85/9L990/9L930) and a number
of 144 kV transmission lines as shown in Appendix 2. The transfer-in and transfer-out limits for the
northeast area are mainly established to avoid overload and voltage instability/deviation in the event of
next single contingency, and are dependent on the status of each of the three (3) 240 kV paths
connecting the northeast area to the interconnected electric system.
Loss of two (2) of these 240 kV bulk transmission paths can cause generation instability, voltage
instability or unacceptable low voltage excursions under high transfer-out conditions.
Loss of all three (3) 240 kV bulk transmission lines can result in extreme voltage and frequency
excursions in the northeast area causing generating unit tripping, load loss and the separation of the
northeast area into electrical islands, and may also cause power outage to the City of Fort McMurray and
the community of Fort MacKay.
Two (2) maps of the northeast area are provided in this information document. Appendix 2 provides a
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ID# 2011-008(R)
detailed geographical map of the northeast area indicating bulk transmission lines and substations.
Appendix 3 provides a detailed schematic of the northeast area cutplanes transfer-out and transfer-in
conditions respectively, including the generating units (listed in Appendix 1) that are considered effective
in managing a regional transmission constraint.
A cutplane is a common term used in engineering studies and is a theoretical boundary or plane crossing
two (2) or more bulk transmission lines or electrical paths. The cumulative power flow across the
cutplane is measured and can be utilized to determine flow limits that approximate conditions that would
allow safe, reliable operation of the interconnected electric system.
The AESO respects the Fort McMurray Import limits when managing the inflow to the northeast area and
the AESO respects the Fort McMurray Export cutplane limitswhen managing the outflow from the
northeast area. Additionally, the AESO respects the Kinosis-Leismer (KNL) cutplane limits when
managing the inflow to the load served by Kinosis and Leismer substations in the event of generation
shortfall at Long Lake and Conklin facilities. In the map of Appendix 3, each cutplane is illustrated.
4
Constraint Conditions and Limits
When managing a transmission constraint in the northeast area of Alberta which results from bulk
transmission line flows into and out of the northeast area being above reliable system operating limits, the
AESO calculates the regional cutplane flow limits for each of the FORT MCMURRAY IMPORT cutplane,
FORT MCMURRAY EXPORT cutplane, and KNL cutplane and uses the appropriate cutplane limit in a
manner that protects transmission facilities and ensures the continued reliable operation of the
interconnected electrical system. A further description of those cutplane limits under different operating
conditions is set out in Tables 1 to 3 of Appendix 4.
4.1
Studied Constraints and Limits
Transfer-In Limits at the FORT MCMURRAY IMPORT Cutplane
The FORT MCMURRAY IMPORT cutplane power flow is defined in relation to three (3) specific
substations in the northeast area and is calculated as the total of inflow on:
9L10 @ 939S Livock; plus
9L55 @ 885s McMillan; plus
9L930 @ 72S Leismer.
The AESO establishes transfer-in limits at the FORT MCMURRAY IMPORT cutplane to avoid voltage
instability in the event of certain contingency conditions. Those specific conditions along with the
corresponding inflow limit are set out in Appendix 4, Table 1. The transfer-in limits on the FORT
MCMURRAY IMPORT cutplane are determined by voltages at 888S Dover and 825S Whitefish Lake
substations. As identified in Appendix 4, Table 1, maintaining voltages at a higher acceptable range at
these substations enables more power transfer into the northeast area.
Transfer-Out Limits at the FORT MCMURRAY EXPORT Cutplane
FORT MCMURRAY EXPORT cutplane power flow is calculated as the total of outflow on:
9L57 @ 888S Dover; plus
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ID# 2011-008(R)
9L07 @ 888S Dover; plus
9L23 @ 848s Ruth Lake; plus
848S Ruth Lake transformers 901T and 902T.
The AESO establishes transfer-out limits at the FORT MCMURRAY EXPORT cutplane to avoid bulk
transmission line overloads or unacceptable low voltage excursions in the event of certain contingency
conditions. The specific contingency conditions and the corresponding outflow limit are set out in
Appendix 4, Table 2.
Transfer-In Limits at the KNL Cutplane
KNL cutplane power flow is calculated as the total of flow on:
9L85 @ 856S Kinosis; plus
9L930 @ 72S Leismer
OR
9L85 @ 977S Salt Creek; plus
9L930 @ 825S Whitefish Lake.
The AESO has also established transfer-in limits at the KNL cutplane to address the dynamic stability
concerns. The specific contingency conditions and the associated inflow limits are set out in Appendix 4,
Table 3. The KNL cutplane includes 762S MEG Conklin and 864S Long Lake generating units. There are
no transfer-out limits on the KNL cutplane.
5
Transmission Constraint Management
While the AESO generally manages transmission constraints in all areas of Alberta in accordance with
the provisions of Section 302.1 of the ISO rules, not all of those provisions are effective in the northeast
area due to certain unique operating conditions that exist in the area. Because of those unique operating
conditions, this information document represents the application of the general provisions of Section
302.1 to the northeast area, and provides additional clarifying steps as required to effectively manage
transmission constraints in that area.
The protocol steps which are effective in managing transmission constraints in the northeast area are
outlined in Table 1 below, followed by additional steps which may be required.
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ID# 2011-008(R)
Table 1
Transmission Constraint Management
Sequential Procedures for Northeast Area
Applicable to
the
FORT
MCMURRAY
IMPORT
cutplane
inflow?
Applicable to
the
FORT
MCMURRAY
EXPORT
cutplane
outflow?
Applicable
to
the
KNL
cutplane inflow?
(a) Determine
effective pool
assets
Yes
Yes
Yes
(b) Ensure
maximum
capability not
exceeded
No
Yes
No
(c) Curtail
effective
downstream
constraint side
export service
and upstream
constraint side
import service
No
No
No
(d) Curtail
effective demand
opportunity
service on the
downstream
constraint side
Yes
No
Yes
(e)(i) Issue a
dispatch for
effective
contracted
transmission
must-run
No
No
No
(e)(ii) Issue a
No
No
No
Section 302.1 of
the ISO rules,
subsection 2(1)
protocol steps
1
1
An exception would be if the inflow limit does not allow for non-industrial system designation firm load to be
served.
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ID# 2011-008(R)
Applicable to
the
FORT
MCMURRAY
IMPORT
cutplane
inflow?
Applicable to
the
FORT
MCMURRAY
EXPORT
cutplane
outflow?
Applicable
to
the
KNL
cutplane inflow?
(f) Curtail
effective pool
assets in reverse
energy market
merit order
followed by prorata curtailment
No
Yes
No
(g) Curtail
effective loads
with bids in
reverse energy
market merit
order followed by
pro-rata load
curtailment
Yes
No
Yes
Section 302.1 of
the ISO rules,
subsection 2(1)
protocol steps
directive for
effective noncontracted
transmission
must-run
Applicable Protocol Steps
The first step in managing a transmission constraint is to identify those generating units and loads
effective in managing the transmission constraint, otherwise known as the effective pool assets. While all
of the generating units and loads operating in the northeast area are indicated on the single line diagram
in Appendix 3, for various reasons not all of them are effective in managing a transmission constraint in
all conditions. A list of the generation pool assets that are effective in managing a transmission constraint
are set out in Appendix 1.
Step (a)
The FORT MCMURRAY IMPORT and KNL cutplanes are managed by curtailing effective downstream
load for inflow constraints. The KNL cutplane presently does not have any outflow limit and the MEG1
and NX02 generating units located within the KNL cutplane do not have effective load and therefore are
not impacted. The FORT MCMURRAY EXPORT cutplane has effective generation pool assets which are
identified in Appendix 1.
Step (b)
Curtailing generation pool assets to their maximum capability is not effective for the FORT MCMURRAY
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IMPORT and KNL inflow constraints, but it is effective for FORT MCMURRAY EXPORT outflow
constraints and is used when a FORT MCMURRAY EXPORT constraint occurs.
Step (c)
There are no interties within the northeast area and southern Alberta import and export flows on the
system are not effective in managing a transmission constraint.
Step (d)
Curtailing effective demand opportunity service on the downstream constraint side is only effective when
inflow limits are exceeded for the FORT MCMURRAY IMPORT and KNL cutplane inflow and is used if
demand opportunity service is available to be curtailed when a FORT MCMURRAY IMPORT or KNL
inflow constraint occurs.
Steps (e)(i) and (ii)
There are no transmission must-run contracts in the northeast area and transmission must-run is not
2
effective in managing a transmission constraint in the northeast area.
Step (f)
In order to address a long-term constraint, curtailing effective generating units using the reverse merit
order followed by pro-rata curtailment is only effective when outflow limits are exceeded for FORT
MCMURRAY EXPORT cutplane. A short term constraint is considered to include the hour the constraint
occurred, plus the following two (2) hours, when the reverse merit order is utilized. For long-term
constraints, the pro rata curtailment of identified effective generation pool assets occurs.
Step (g)
Curtailing load pool assets in reverse energy market merit order followed by pro-rata load curtailment of
identified generation pool assets is the last step of the protocol and is used when inflow limits are
exceeded for the FORT MCMURRAY IMPORT, FORT MCMURRAY EXPORT or KNL cutplanes. When
pro-rata load curtailment is required, the AESO issues directives to effective direct connect industrial
loads and to the northeast area legal owner of transmission facilities specifying the required pro-rata
curtailment levels.
6
Project Updates
As necessary, the AESO intends to provide information in this section about projects underway in the
northeast area that are known to have an impact on the information contained in this information
document.
7
Appendices
Appendix 1 – Effective Pool Assets
Appendix 2 – Geographical Map of the Northeast Area
2
In the unusual circumstance that the northeast area is being supported by a single path and the inflow is limited
to an amount less than the non-industrial system designation firm load, the AESO may issue directives to effective
generation pool assets to provide sufficient energy to meet such firm load.
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ID# 2011-008(R)
Appendix 3 – Northeast Area Cutplanes: Transfer-in and Transfer-out Single Line Diagram
Appendix 4 – Cutplane Transfer Limits for the Northeast Area
Revision History
Version
1.0
2.0
Effective Date
2011-06-30
2012-06-14
3.0
4.0
2012-09-13
2012-12-04
Information Document
Effective: 2012-12-04
Description of Changes
Initial Release
Updated to include material content from existing Section 302.5 of
the ISO rules, Northeast Area Transmission Constraint
Management
Updated to include minor drafting edits
Updated to include cutplane name changes, updated maps and
minor drafting edits.
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ID# 2011-008(R)
Appendix 1 – Effective Pool Assets
1. The effective generation pool assets for the FORT MCMURRAY EXPORT cutplane, listed
alphabetically by their pool IDs, are:
CNR5
MKR1
MKRC
SCL1
SCR1
2. The effective load pool assets for the FORT MCMURRAY IMPORT cutplane include:
Load – curtailed in accordance with the transmission facility owner load curtailment plan.
3. The effective pool assets for the KNL cutplane include:
Load – curtailed in accordance with the transmission facility owner load curtailment plan.
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Appendix 2 – Geographical Map of the Northeast Area
Bitmuont
941S
75-PLH-902
P791 McClelland
957S
L9900 (future 9L32)
IOL Kearl
L9900
Aurora
9L69
75-PLH-901
CNRL
9L 32
P791
Joslyn
849S
Dover
North
9L74
9L01
9L5
7
Thickwood
951S
9L07
(201
5)
9 L 10
9L15
Hangingstone
820S
7L135
3
7L
85
9L
6
P673
Salt Creek 977S
856S
Kinosis
500kV line to Genessee
Gregoire
883S
2011S - Dawes
Algar
875S
JACOS
7L38
2013
HorseRiver
917S
Waddel
907S
860S
Crow Lake
95
7L
Future 240 kV Development
Future 138 kV Development
240kV - Existing System
Leismer
72S
P1084
Chard P/S
2013
9L
93
0
852S
Round Hill
138kV - Existing System
P1106
Enbridge-Janvier
2012-2013
P868
MEG Surmont
2011-2014
Cenovus
Narrows Lake
2015
Cenovus
Sunday Creek
2013
723S
Christina
Lake
Existing Generation
9L47
Future Substation
MEG-Conklin
762S
CHL1
971L
Devon
JackFish
2013
Devon
Pike
2015
Future Generation
P927
Quigley 989S
Kettle River
2013
P1122
StatOil-Corner
2014-15
9L55
Future 500 kV Development
Conoco
POD II
2013-14
Mariana
833S
7LA38
885S
McMillan
7L121
9L89
7L170
LongLake
841S
7L104
9L990
To Mitsue
933S
P899-TowerRoad
7
500kV line to Heartland
P776
Saleski 901S
(2014)
9
7L
9L 56
720S
Wabasca
P791
Parsons Creek
718S
876S
Brintnell
9L 15
Firebag
Dog Rib
2082S
5
16
7L
23
9L
To Wesley
Cr.
12/13
29PL91
29PL7-
Ruth Lake
848S
9L58
7L71 / 7L47
7L142
7L125
Millennium
29EDD-1
BirchWood Creek
960S
(2013)
P834
Livock - 939S
P777
Germain
9L77
29EDD-3
Syncrude
DO5
MacKay
874S
9L58 (future 9L30)
9L07 (future 9L68)
P-948 AOSC
MacKay
(2013)
9L39
P791
BlackFly 934S
Dover
888S
Southern
Pacific
P561
Green Stocking
925S
9L84
9L08
Clastics
2014
(APR 2013)
Shell
Jackpine
920S
847S
Moose
River
2001S
9L09
Dover
West
Muskeg River
9L 66
CHL4
CHL2
Enbridge
UnderWood
2015
7L89
AESO
Heart Lake
P1044
898S
WiauLake
This diagram contains a simplified version of the
system configuration. Technical detail has been
simplified for illustration purposes. It does not
indicate geographical locations of facilities
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Effective: 2012-12-04
9L22
Fort McMurray Area Development
2011-2015 System Configuration
13S
DeerLand
Winefred
818S
P683
Kirby CNRL
2013
9L37/9L36
9L960/9L961
825S
Whitefish Lake
Margurite Lake
826S
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Appendix 3 – Northeast Area Cutplanes: Transfer-in and Transfer-out Single Line Diagram
CNRL 75EDD-7502
CNRL 75-EDD-7501
75-PLH-901
IOL Kearl
L9900(future 9L32)
Bitumont
941S
75-PLH-902
Syncrude Aurora
GO1
9L32
9L66
Joslyn Creek
849S
Shell
Jackpine
920S
9L09
9L08
Muskeg River
847S
Syncrude DO5
(Base Plant)
MacKay River
874S
RL-1
9L43
Dover
888S
Ruth Lake
848S
9L01
M
9L39
RL-2
29PL9-2
9L58
Fort McMurray
Export cutplane
Green
Stocking
925S
Black Fly
934S
901T
902T
M
Millennium
29EDD-1
29PL9-1
9L84
Parsons Creek
718S
Tower
Road
933S
9L57
9L07
Germain
950S
7L38
Horse
River
917S
M
7L121
Creek
977S
Gregoire
Lake
883S
9L55
Fort McMurray
Import cutplane
Wabasca
720S
7L02
Quigley
989S
9L990
Leismer
72S
Conklin
762S
957L
Crow Lake 860S
Round Hill
852S
M
Waddel
907S
9L47
Brintnell
876S
971L
Christina
Lake
723S
Heart Lake
898S
788L
Winefred
818S
7L89
Lac La Biche
157S
405S
Mitsue 732S
7L30
7L31
9L22
9L930
728L
794L
844S
Not to Scale
Legend:
CNRL
Kirby
9L960/961
240 kV
Whitefish
Lake
825S
13S
819S
9L37
9L40
7L226
7L15
M
9L56
7L49
Long Lake
Cogen
864S
Long
Lake
841S
Kinosis
856S
M
7LA38
McMillan
885S
9L15
Wesley
Creek 834S
9L85
KNL
Cutplane
Mariana
Lake 833S
9L10
7L71
7L165 Salt
Hanging
Stone
820S
7LA36
Livock
939S
9L23
7L97
7L135
7L36
Algar
875S
7L47
138/144 kV
72 kV
Common Tower
9L36
9L913
826S
69S
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M
Metering point
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Appendix 4 – Cutplane Transfer-Limits for the Northeast Area
Table 1 FORT MCMURRAY IMPORT Cutplane transfer-in limits
For the FORT MCMURRAY IMPORT cutplane inflow, the voltage levels at 888S Dover and 825S
Whitefish Lake substations determine the MW values for different operating conditions. When the system
is normal, as evidenced by the voltage at these substations being above the identified limits, the inflow
could be as high as 440 MW as indicated in the table below.
Outage
Voltage Level
FORT
MCMURRAY
IMPORT
Transfer-In limit
3
(MW)
Critical
Contingency
Limiting Issue
Normal
888S < 260kV AND 825S
< 258kV
350
9L23
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
380
9L23
voltage deviation
888S > 260kV AND 825S
> 258kV
440
9L23/977S Tx
or 7L135
voltage deviation
888S < 260kV AND 825S
< 258kV
260
977S Tx or
7L135
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
290
9L23
voltage deviation
888S > 260kV AND 825S
> 258kV
360
9L23
voltage deviation
888S < 260kV AND 825S
< 258kV
270
9L07
voltage deviation
N-1 condition
9L10
9L55
3
With higher voltages at 825S Whitefish Lake and 888S Dover, Fort McMurray Import cutplane can be operated
with higher transfer-in limits.
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Outage
9L47
9L930
Voltage Level
Critical
Contingency
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
300
9L930
888S > 260kV AND 825S
> 258kV
300
9L930
888S < 260kV AND 825S
< 258kV
270
9L07
300
9L930
888S > 260kV AND 825S
> 258kV
300
9L930
888S < 260kV AND 825S
< 258kV
250
9L23/9L07
888S > 260kV AND 825S
> 258kV
888S < 260kV AND 825S
< 258kV
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
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Limiting Issue
9L56/913L
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
9L23
FORT
MCMURRAY
IMPORT
Transfer-In limit
3
(MW)
9L56/913L
voltage deviation
9L56
9L56
848S 703T/7L02/7L121
848S 703T/7L02/7L121
260
9L23/9L07
280
9L23/9L07
250
9L930/9L07
848S
703T/7L02/7L121/voltage
stability
848S 703T/7L02/7L121
848S 703T/7L02/7L121
260
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9L930/9L07
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Outage
9L57
9L58
9L85
4
9L990
Voltage Level
FORT
MCMURRAY
IMPORT
Transfer-In limit
3
(MW)
Critical
Contingency
888S > 260kV AND 825S
> 258kV
280
9L930/9L07
888S < 260kV AND 825S
< 258kV
260
9L23/977S Tx
or 7L135
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
300
9L23/977S Tx
or 7L135
voltage deviation
888S > 260kV AND 825S
> 258kV
340
9L23/977S Tx
or 7L135
voltage deviation
888S < 260kV AND 825S
< 258kV
340
9L23/977S Tx
or 7L135
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
380
9L23/977S Tx
or 7L135
voltage deviation
888S > 260kV AND 825S
> 258kV
440
9L23/977S Tx
or 7L135
voltage deviation
888S < 260kV AND 825S
< 258kV
270
9L23,or 977S
Tx, or 7L135
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
320
9L23,or 977S
Tx, or 7L135
voltage deviation
888S > 260kV AND 825S
> 258kV
380
9L23,or 977S
Tx, or 7L135
voltage deviation
/7L02/7L121
888S < 260kV AND 825S
< 258kV
250
9L23/9L07
848S 703T or
7L02/7L121
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Limiting Issue
848S 703T/7L02/7L121
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ID# 2011-008(R)
Outage
9L15
9L07
9L22
Voltage Level
FORT
MCMURRAY
IMPORT
Transfer-In limit
3
(MW)
Critical
Contingency
Limiting Issue
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
260
9L23/9L07
888S > 260kV AND 825S
> 258kV
280
9L23/9L07
848S 703T or
7L02/7L121
888S < 260kV AND 825S
< 258kV
340
9L23/977S Tx
or 7L135
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
360
9L23/977S Tx
or 7L135
voltage deviation
888S > 260kV AND 825S
> 258kV
420
9L56/977S Tx
or 7L135
voltage deviation
888S < 260kV AND 825S
< 258kV
270
9L930
7L02/7L121/7L38
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
270
9L930
7L02/7L121/7L38
888S > 260kV AND 825S
> 258kV
280
9L930
7L02/7L121/7L38
888S < 260kV AND 825S
< 258kV
270
9L23/977S Tx
or 7L135
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
300
9L23/977S Tx
or 7L135
voltage deviation
888S > 260kV AND 825S
350
9L23/977S Tx
voltage deviation
Information Document
Effective: 2012-12-04
Page 14
848S 703T or
7L02/7L121
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Information Document
Northeast Area Transmission Constraint Management
ID# 2011-008(R)
Outage
Voltage Level
FORT
MCMURRAY
IMPORT
Transfer-In limit
3
(MW)
> 258kV
9L56
Critical
Contingency
Limiting Issue
or 7L135
888S < 260kV AND 825S
< 258kV
290
9L23/977S Tx
or 7L135
voltage deviation
888S ≤ 260kV AND 825S
≥ 258kV OR 888S ≥
260kV AND 825S ≤
258kV
340
9L23/977S Tx
or 7L135
voltage deviation
888S > 260kV AND 825S
> 258kV
390
9L23/977S Tx
or 7L135
Voltage stability
9L10+9L55
N/A
120
9L930
Dynamic
9L10+9L22
N/A
100
9L930
788L
9L10+9L930
N/A
120
9L22
Dynamic
9L10+9L990
N/A
120
9L22
Dynamic
9L10+9L85
N/A
110
9L22
Dynamic
9L10+9L23
N/A
150
9L930
Dynamic
9L10+9L07
N/A
140
9L930
Dynamic
9L55+9L930
N/A
110
9L10
Dynamic
9L22+9L930
N/A
120
9L10
Dynamic
9L01+9L58
N/A
100
9L930
7L02/7L121/7L38
9L15+9L56
N/A
250
9L930
Dynamic
N-2 condition
Information Document
Effective: 2012-12-04
Page 15
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Information Document
Northeast Area Transmission Constraint Management
ID# 2011-008(R)
Table 2 FORT MCMURRAY EXPORT Cutplane transfer-out limits
In the event of N-1 or N-2 contingencies for the FORT MCMURRAY EXPORT cutplane outflow, the
system normal limit of 630 MW is reduced as indicated in the table below.
FORT MCMURRAY
EXPORT Cut-plane
Limit(MW)
Limiting Equipment
Limiting
Contingency
FMM 144kV
System Load
630
848S 703T
9L23
N/A
Contingency
FORT MCMURRAY
EXPORT Cut-plane
Limit(MW)
Limiting Equipment
Limiting
Contingency
FMM 144kV
System Load
9L23
280
848S 704T/7L165
848S 703T
N/A
9L07
350
848S 703T/7L165
9L23
N/A
9L57
330
848S 703T/7L165
9L23
N/A
9L930
420
848S 703T/7L165
9L23
N/A
9L990
500
7L36 or voltage
deviation
9L23
N/A
9L85
500
7L36 or voltage
deviation
9L23
N/A
9L990
420
848S 703T/7L165
9L23
N/A
9L15
520
848S 703T/7L165
9L23
N/A
9L22
520
848S 703T/7L165
9L23
N/A
9L55
500
848S 703T/7L165
9L23
N/A
500
848S 703T/7L165
9L23
N/A
9L47
500
848S 703T/7L165
9L23
N/A
9L56
530
848S 703T/7L165
9L23
N/A
System
Normal
N-1 Condition
9L10
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Effective: 2012-12-04
Page 16
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Information Document
Northeast Area Transmission Constraint Management
ID# 2011-008(R)
848S 901T
420
848S 902T
9L23
160
848S 902T
390
848S 901T
9L23
160
977S T1
420
848S 704T
848S 703T
160
885S T2
450
848S 703T/7L165
9L23
160
Contingency
FORT MCMURRAY
EXPORT Cut-plane
Limit(MW)
Limiting Equipment
Limiting
Contingency
FMM 144kV
System Load
9L57+9L07
170
848S 703T/7L165
9L23
N/A
9L57+9L23
170
848S 703T/7L165
9L07
N/A
9L07+9L23
170
848S 703T/7L165
9L57
N/A
9L55+9L23
260
848S 703T/7L165
9L57
N/A
9L55+9L57
250
848S 703T/7L165
9L23
N/A
9L55+9L930
290
Stability
9L23
N/A
9L55+9L10
270
Stability
9L23
N/A
9L57+9L930
260
7L36
9L07
N/A
9L01+9L58
170
848S 703T/7L165
9L23
N/A
848S T1+T2
350
Voltage deviation
9L23
N/A
N-2 Conditions
Table 3 KNL Cutplane transfer-in limits
In the event of a contingency involving loss of a 240 kV path (9L23 or 9L990 or 9L930), the normal KNL
cutplane inflow limit of 140 MW is lowered to 30 MW as indicated in the table below.
KNL Cut-plane
Limit(MW)
System
140
Normal
N-1
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Effective: 2012-12-04
KNL Cut-plane
Page 17
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Information Document
Northeast Area Transmission Constraint Management
ID# 2011-008(R)
Contingency
Limit(MW)
Either 9L23, or
9L990 or
9L930
30
Note: If the KNL is under export condition, there are no limits.
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Effective: 2012-12-04
Page 18
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