515 SOUTH AREA OPERATION 1. Purpose

Operating Policies and Procedures
Transmission
OPP 515
Issued:
Supersedes 2007-09-27
515 SOUTH AREA OPERATION
1.
Purpose
To provide policies for market participants and policies and procedures for the System Controller (SC)
to follow when managing the reliable operation of the transmission system and wind power facilities
(WPF) operations in the South area of Alberta, except the Empress area which is covered in OPP 503.
2.
Background
As more wind power facilities (WPF) are added in the Southwest area, more transmission constraints
occur in the system such as overloading of transmission facilities. Remedial action schemes (RASs)
have been installed to trip or run-back generation to reduce overloads on transmission facilities. Refer
to Table 3, Table 4, Table 5 and Table 8 for description of RASs. In situations where a RAS is not
triggered, action is required by the SC and other operating entities to remove overloads on transmission
facilities.
The wind turbine generators at the Magrath WPF, Garden City (226S), are doubly-fed induction
machines capable of controlling reactive power. A WindVar device has been installed at the Garden
City substation (226S). It will send a command signal to all the wind turbine generators to adjust
reactive power in order to regulate the collector substation voltage. The Magrath WPF will operate to a
voltage control set point directed by the SC. Garden City (226S) is connected via 891L/863L between
Riverbend (T618S) and Magrath (T225S) resulting in a 3 terminal line. This line is protected by a line
overcurrent differential scheme.
Six 6.6 MVAr independently switched capacitor banks and an 8 MVAr Dynamic VAR (D-VAR)
voltage regulation system have been installed at the Summerview substation (354S) for voltage control.
The D-VAR operates to a voltage control set point directed by the SC. The Oldman River Hydro
(A806S) generation is connected to the Pincher Creek substation (T396S) on the same line as
Summerview WPF via 893L, resulting in a 3 terminal line (893L and 893AL). This line is protected by a
line overcurrent differential scheme.
The wind turbine generators at the Taylor WPF are induction machines with back-to-back rectifierinverter units providing power factor control. The Taylor WPF is located adjacent to the Taylor Hydro
generation station which is radially connected to Magrath (T225S).
The Kettles Hill WPF is located approximately 7 km from Pincher Creek substation (T396S) and 24
km from Peigan substation (59S). The associated Kettles Hill substation (383S) is T-tapped from 170L.
This WPF is comprised of 35 sets of 1.8 MW asynchronous generators, totaling 63 MW. The voltage
regulation system consists of five 6.6 MVAr independently switched capacitor banks and an 8 MVAr
D-VAR.
The Soderglen WPF is comprised of 47 sets of 1.5 MW asynchronous generators, totaling 70.5 MW.
The wind turbines are equipped with wind volt-amp-reactive (WindVAR) system for voltage regulation.
The associated Soderglen substation (243S) is T-tapped from 725L (Peigan substation 59S – Bowron
substation L674S).
The Suncor Chin Chute WPF is comprised of 20 sets of 1.5 MW doubly-fed asynchronous generators,
totaling 30 MW. The associated Hillridge substation (139S) is T-tapped from 172L (Coaldale T254S –
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Transmission
OPP 515 South Area Operation
Taber T83S). The WPF is equipped with a dynamic voltage regulator together with an 8 MVAr
capacitor bank for voltage control.
The ENMAX Taber WPF is comprised of 37 sets of 2.2 MW wind turbines, totally 80 MW. The
associated Taber Wind substation (C134S) is T-tapped from 607L (Fincastle T336S – Conrad T135S).
The reactive power system is comprised of a 4.2 MVAr capacitor bank on each of the two collector
system buses and dynamic VAR capability from the wind turbine generators.
Dynamic thermal line rating (DTLR) system is installed on the 170L between Pincher Creek T396S and
Peigan 59S. Three CAT-1 Remotes monitor the line and transmit the data to the EMS via the CAT
Master Station. The EMS will compare and select the lesser of calculated dynamic ratings or the 170L
maximum ratings and provide visibility to the operators.
The major transmission and generation facilities which are presently part of the South area are shown
in Figure 1. A list of generation in the South area is provided in Table 1.
A portion of AltaLink Operating Procedure T-1.1 has been applied in developing this OPP. Table 2
presents the 69 kV and 138 kV line capacity limits and maximum duration for a sustained overload.
The SC must manage interchange levels within the criteria specified by the WECC. The SC maintains
energy balance between generation and load within the Alberta control area by dispatching energy
offered into the energy market merit order, and dispatching regulating reserve assets in the ancillary
service merit order. Any unanticipated changes in generation or load can cause the interchange level on
the AB-BC interconnection to go off schedule and may require intervention by the SC to recover the
interchange level to the scheduled value. To help the SC maintain the generation-load balance, approval
from the SC is required before interconnecting generation to the AIES.
3.
Policy
•
Southwest area generation may be constrained or curtailed due to area system constraints.
•
The Magrath WPF RAS will operate when either 618S863X is open or both 618S725N and
618S824 are open at Riverbend (T618S) as described in Table 3.
•
The Irrican Hydro RAS will operate under specific conditions as described in Table 5.
•
Dynamic thermal line rating (DTLR) will be used for monitoring 170L (Pincher Creek 396S –
Peigan 59S). If the DTLR for 170L is not available, static rating will be used in monitoring the
line.
•
The maximum continuous rating generated from the DTLR will be limited to 600 A (143 MVA
at rated voltage) in the summer and 720 A (172 MVA at rated voltage) in the winter due to
thermal constraint.
•
The Summerview – Kettles Hill WPF RAS for monitoring 170L (Pincher Creek 396S – Peigan
59S) will base on the DTLR for initiating generation runback signals when the line exceeds 100
% of the DTLR. The RAS will initiate instantaneous generator tripping signals when the line
exceeds 140 % of the static rating, regardless of the DTLR.
•
Upon loss of the DTLR, the Summerview – Kettles Hill WPF RAS will use static summer and
winter ratings.
•
The Summerview – Kettles Hill WPF RAS will operate for overload conditions 786L at Coleman
substation (T799S) as described in Table 4. If the line exceeds its preset threshold, this RAS will
be triggered. The first stage is to run back the WPF generators and the second stage is to trip the
WPF generators if overload still persists in the sequence as specified in Table 4.
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Transmission
OPP 515 South Area Operation
•
If the Summerview component of the RAS is not available then the SC will undertake the preemptive action as described in Section 5.5 to curtail Summerview. Similarly, if it is only the
Kettles Hill component of the RAS that is unavailable, then only Kettles Hill will be curtailed.
•
The Soderglen WPF RAS will operate for overload conditions on 725LW at Bowron substation
(L674S) or communication link failure as described in Table 8.
•
Transmission facility overloads caused by single transmission contingencies will be removed by
curtailing generation through the operation of RASs and through SC directives as described in
Table 6.
•
System voltage levels will be maintained within operating limits by utilizing the reactive power
capability of generators during normal and emergency conditions. The Summerview, Kettles Hill,
Soderglen, Suncor Chin Chute, EMMAX Taber, and Magrath WPF operators will comply with
voltage adjustment directives (kV) from the SC to adjust the voltage set point within 10 minutes.
•
Active VAr coordination by the SC, between generators at Oldman River Hydro (A806S),
Summerview WPF, Kettles Hill WPF, Soderglen WPF and Transmission Facility Owner (TFO)
system compensation devices at Pincher Creek (T396S) is required to keep voltages within
desired operating ranges, for the different operating conditions encountered in the Southwest
area. The operating ranges for the voltage at the Pincher Creek (T396S) 138 kV bus are defined
in OPP 702. This operating range is applicable to Oldman River Hydro (A806S), Kettles Hill
(383S) and Summerview (354S) 138kV bus voltage as well.
•
If the Summerview WPF, Kettles Hill, Soderglen, Suncor Chin Chute, ENMAX Taber or the
Magrath WPF cannot comply with a voltage adjustment directive within 10 minutes, the WPF
operator will immediately inform the SC and provide reasons along with the estimated time
when the voltage set point adjustment can be made. The SC will assess the area requirements and
take alternative action if required. See Section 5.1 and Section 5.2 for details.
•
Following any area contingency or during emergency conditions, the SC may issue directives to
curtail load or generation output to maintain system reliability or protect system facilities. In
order to achieve the desired result:
−
The WPF generation at Magrath, Summerview, Kettles Hill, Soderglen, Suncor Chin
Chute, ENMAX Taber and Taylor must be capable of being curtailed within 10 minutes to
the MW level identified by the SC.
−
Load or generation output must not exceed the level identified by the SC during the time a
directive is in effect.
•
If generation cannot be curtailed within 10 minutes, the SC will, when practical, direct AltaLink
to remove the generation by opening the interconnection breaker or transmission facility to
maintain system reliability or protect system facilities. AltaLink can trip but cannot close the
interconnection breaker 52/T1 at Garden City (226S), 138 kV breaker at Soderglen (243S),
138kV breaker at Kettles Hill (383S), 138CB1 at Summerview (354S), 138 kV breaker (52/B1) at
Suncor Hillridge (139S), or 138 kV breaker at Taber Wind Farm (C134S).
•
In order to allow the SC to maintain the energy balance between generation and load within the
AIES, the following policy applies:
−
Generator operators must obtain SC approval before interconnecting generation to the
AIES.
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Transmission
OPP 515 South Area Operation
4.
−
WPF operators must obtain SC approval before energizing a feeder to restore wind
generation after a forced or planned outage to any feeder in the wind farm collector
system.
−
Generator operators must obtain SC approval before increasing generation output after
being tripped, ran back due to the operation of a RAS or curtailed by the SC.
Responsibilities
4.1
System Controller
The SC will:
4.2
•
Issue directives to generator operators and/or AltaLink to curtail generation as required to
remove transmission facility overloads in the Southwest area.
•
Issue directives to Summerview, Magrath, Soderglen, Kettles Hill, Suncor Chin Chute, and
ENMAX Taber WPF operators for voltage set point adjustments as required.
Generation Facility Operators
The generation facility operators will:
•
Comply with directives to curtail generation within 10 minutes to the MW level identified
by the SC.
•
Not allow their generation output to exceed the level identified by the SC during the time
a curtailment directive is in effect.
•
Receive approval from the SC before interconnecting generation to the AIES.
•
Receive approval from the SC before increasing generation output after being tripped, ran
back due to the operation of a RAS, or directed by the SC.
•
Inform the SC immediately if they are unable to comply with a voltage adjustment
directive within 10 minutes and provide reasons along with the estimated time that the
voltage adjustment can be made.
In addition:
4.3
•
WPF operators must receive approval from the SC before energizing a feeder to restore
wind generation after a forced or planned outage to any feeder in the wind farm collector
system.
•
The Summerview, Kettles Hill, Soderglen, Suncor Chin Chute, ENMAX Taber, and
Magrath WPF operators will comply with directives from the SC to adjust the voltage set
point within 10 minutes.
Transmission Facility Owner
•
AltaLink can take immediate action to operate transmission facilities to protect their
equipment, public or personnel safety or the environment. AltaLink will notify the SC of
these actions as soon as possible.
•
AltaLink will comply with directives from the SC to remove generation by opening the
interconnection breaker or transmission facility unless such action could result in damage
to equipment, risk to public or personnel safety, or risk of undue damage to the
environment.
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Transmission
OPP 515 South Area Operation
•
5.
AltaLink cannot close the interconnection breaker at Garden City 226S (52/T1), Soderglen
243S, Kettles Hill 383S, Summerview 354S (138CB1), Suncor Hillridge 139S (52/B1) or
Taber Wind Farm C134S (134B138-607AL)
System Controller Procedures
5.1
Adjusting the voltage set point at Magrath WPF
To adjust the voltage set point at Magrath WPF the SC will:
5.2
1.
Direct the operational contact as listed in Table 7 (confidential) to adjust the voltage to the
new set point.
2.
If informed by the WPF operator that he is unable to comply with the voltage adjustment
directive:
a.
Assess the area requirements considering the estimated time that the WPF operator
can make the voltage set point adjustment.
b.
Take alternative action if required (including tripping of generation or load).
c.
Record the date, time and description of the event along with the WPF operator’s
reason for the inability to comply with the voltage adjustment directive in 10
minutes in the System Controller Shift Log as described in OPP 1301.
Adjusting the voltage set point at Oldman River Hydro, Summerview WPF,
Soderglen WPF and Kettles Hill WPF
The SC will:
1.
2.
Coordinate operation of Pincher Creek (T396S) 138 kV bus voltage by:
a.
Coordinating VAr adjustments from Oldman River Hydro and Summerview WPF,
and Kettles Hill WPF to provide area voltage support while maintaining a VAr
balance between the generating assets. Refer to Table 7 (confidential) for
operational contacts.
b.
Requesting the AltaLink South Transmission Operator to switch area reactive
devices as required.
c.
Checking VAr flows at the Oldman River Hydro, Summerview, Soderglen and
Kettles Hill substations for proper VAr control coordination among Oldman River
Hydro, Summerview WPF and Kettles Hill WPF and the reactive devices, and
making adjustments as required.
If informed by the WPF operator that he is unable to comply with the voltage adjustment
directive:
a.
Assess the area requirements considering the estimated time that the WPF operator
can make the voltage set point adjustment.
b.
Take alternative action if required (including tripping of generation or load).
c.
Record the date, time and description of the event along with the WPF operator’s
reason for the inability to comply with the voltage adjustment directive in 10
minutes in the System Controller Shift Log as described in OPP 1301.
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Transmission
OPP 515 South Area Operation
5.3
Removing overloads on facilities in the Southwest Area under N-1 contingency
condition
If an N-1 contingency results in overload conditions the SC will:
5.4
1.
Verify the overload condition.
2.
If an alarm for RAS initiation has been received:
a.
Take no action if the overload has been removed.
b.
If the overload persists determine additional manual remedial action required as
identified in Table 6, then go to step 4.
3.
If a RAS initiation alarm has not been received, refer to Table 6 and determine the action
required to remove the overload on the affected facility.
4.
If the manual remedial action requires the curtailment of generation, then:
a.
Determine curtailment volume required by applying the curtailment ratio as
identified in Table 6 and then determine the reduced generation level (i.e. reduced
generation level = current generation level – curtailment volume).
b.
Direct the operational contact as listed in Table 7 (confidential) to reduce generation
down to the reduced generation level.
c.
If the DTLR is not available, use static rating in calculating the amount of
generation curtailment for mitigating 170L (Pincher Creek T396S and Peigan 59S)
overload.
5.
If the overload persists curtail additional generation until the overload is removed.
6.
When the facility that caused the overload returns to service cancel the curtailment
directive and/or permit generation to return to normal operation if curtailed by RAS.
7.
Record the date, time and description of the event in the System Controller Shift Log as
described in OPP 1301.
Loss of Magrath WPF RAS
If the Magrath WPF RAS is unavailable, including loss of the RAS communication path, as
described in Table 6, the SC will:
5.5
1.
Receive a ‘Magrath WPF RAS fail’ alarm and/or notification that the RAS is unavailable.
2.
Issue a directive to curtail the Magrath WPF to 0 MW in 30 minutes; refer to Table 7
(confidential) for operational contact.
3.
If the Magrath WPF fails to curtail, then direct the AltaLink South Transmission Operator
to trip the 138 kV breaker (52/T1) at Garden City (226S) if the Magrath WPF fails to
curtail.
4.
When the Magrath WPF RAS returns to service, cancel the curtailment directive.
5.
Record the date, time and description of the event in the System Controller Shift Log as
described in OPP 1301.
Loss of Summerview – Kettles Hill WPF RAS
If a component of the RAS is not available, the SC will:
1.
Receive an alarm and/or notification.
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Transmission
OPP 515 South Area Operation
2.
Check with the AltaLink Transmission Operator and/or WPF operators to identify the
impact to the integrity of the RAS.
3.
If it is so identified and confirmed by AltaLink that the automatic RAS actions to both
Summerview WPF and Kettles Hill WPF will not be functioning, then
4.
5.
5.6
a.
Issue a directive to curtail the Summerview WPF to 0 MW in 30 minutes.
b.
Direct the AltaLink South Transmission Operator to trip the 138 kV breaker
(138CB1) at Summerview 354S if the Summerview WPF fails to curtail.
c.
Issue a directive to curtail the Kettles Hill WPF to 0 MW in 30 minutes.
d.
Direct the AltaLink South Transmission Operator to trip the 138 kV breaker (52S1) at Kettles Hill 383S if the Kettles Hill WPF fails to curtail.
If it is so identified and confirmed by AltaLink that only the automatic RAS actions to
Summerview WPF will not be functioning while the rest of the RAS remains intact, then
a.
Issue a directive to curtail the Summerview WPF to 0 MW in 30 minutes; refer to
Table 7 (confidential) for operational contact.
b.
Direct the AltaLink South Transmission Operator to trip the 138 kV breaker
(138CB1) at Summerview 354S if the Summerview WPF fails to curtail.
If it is so identified and confirmed by AltaLink that only the automatic RAS actions to
Kettles Hill WPF will not be functioning while the rest of the RAS remains intact, then
a.
Issue a directive to curtail the Kettles Hill WPF to 0 MW in 30 minutes; refer to
Table 7 (confidential) for operational contact.
b.
Direct the AltaLink South Transmission Operator to trip the 138 kV breaker (52S1) at Kettles Hill 383S if the Kettles Hill WPF fails to curtail.
6.
When the component returns to service, cancel the curtailment directives.
7.
Record the date, time and description of the event in the System Controller Shift Log as
described in OPP 1301.
Removing overload on 786L under normal system condition
When 786L is overloaded (it may happen during summer light load and high export conditions),
the SC will:
5.7
1.
Curtail Summerview WPF with curtailment ratio 4.5 to 1.
2.
Direct the AltaLink South Transmission Operator to trip the 138 kV breaker (138CB1) at
Summerview (354S) if the Summerview WPF fails to curtail.
3.
If overload still persists, curtail Kettles Hill WPF with curtailment ratio 4.5 to 1.
4.
Direct the AltaLink South Transmission Operator to trip the 138 kV breaker (52-S1) at
Kettles Hill 383S if the Kettles Hill WPF fails to curtail.
5.
If overload still persists, curtail Castle River WPF with curtailment ratio 4.5 to 1.
Loss of Soderglen WPF RAS
If the Soderglen WPF RAS is unavailable or loss of both “A” and ‘B” teleprotection channels,
the SC will:
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Transmission
OPP 515 South Area Operation
1.
Issue a directive to curtail the Soderglen WPF to 0 MW in 30 minutes; refer to Table 7
(confidential) for operational contact.
2.
Direct the AltaLink South Transmission Operator to trip the 138 kV breaker at Soderglen
243S if the Soderglen WPF fails to curtail.
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Page 8 of 14
DRAFT 2 Issued for review: 2008-01-28
185L
Shell Waterton
T502S
Yarrow
T995S
164L
Drywood
T415S
146L
162L
Glenwood
T229S
225L
Spring Coulee
T385S
225L
Magrath
T225S
Taylor Hydro
Plant
Taylor WPF
891L
863L
185L
55
Glenwood
Magrath WPF
Garden City
226S
Irrican
Hydro
314S
Raymond
Reservoir
T313S
225L
824L
Taber
T83S
610L
Fincastle
T336S
Warner
T344S
Stirling
T67S
Conrad
T135S
ENMAX Taber
WPF
134S
Suncor
Chin Chute
WPF
Hillridge
Chin Chute
139S
T315S
820L
Shell Waterton
T379S
Kettles Hill
383S
Riverbend
T618S
Lakeview
L593S
820L
Coaldale
T254S 172L
L146S
L241S
770L
607L
Castle
River WPF
239S
893L
Pincher
Creek
T396S
Soderglen WPF
243S
Bowron
L674S
L111S
L
725A
Coleman
T799S
Cowley
Ridge WPF
322S
170L
170L
725L
N. Lethbridge
T370S
72
5L
893AL
180L
McBride Lake
240S
Ft. Macleod
T15S
170L
924L
Summerview
Oldman River
WPF
Hydro
Summerview
A806S
354S
911L
Peigan
59S
172L
Monarch
T492S
To Milo
Junction
923L
To Natal
B-1S
Lundbreck
T513S
53
Ft. Macleod
N
To E. Stavely
T928S
To Burdett
T368S
6.
786L
To
Cranbrook
To Langdon
T102S
To Janet
T74S
Transmission
OPP 515 South Area Operation
Figures and Tables
Figure 1
South area generation facilities
1201L
69 kV
Plants
138 kV
Hydro
240 kV
Thermal
500 kV
Wind
Existing
Page 9 of 14
Transmission
OPP 515 South Area Operation
Table 1
Generation in South Area
Generator
Substation
Castle River WPF
239S
Chin Chute Hydro
T315S
Cowley Ridge WPF
Capability (MW)
39.54
11
322S
40.775
Drywood Power Plant
T415S
6
ENMAX Taber WPF
C134S
80
Irrican Hydro
314S
7
Kettles Hill WPF
383S
63
Magrath WPF
226S
30
McBride Lake WPF
240S
75.2
Oldman River Hydro
A806S
32
Raymond Reservoir
T313S
18
Soderglen WPF
243S
70.5
Summerview WPF
354S
68.4
Suncor Chin Chute WPF
139S
30
Taylor Hydro
Taylor Hydro Plant
12
Taylor WPF
Taylor Hydro Plant
3.4
Table 2
AltaLink Transmission Line Capacity Limits and Alarms1
Alarm
Emergency
69 kV & 138 kV Line flow
Maximum Duration
>100% and <110%
10 minutes
110%
0 minutes
Critical
Comment
Critical limit must not be exceeded.
Overload must be removed immediately.
1. As per AltaLink Operating Procedure T-1.1.
Table 3
Magrath WPF RAS
Following the closure of City of Lethbridge 138kV loop (824L line), the Magrath WPF RAS has been modified
accordingly. If either 618S863X is open or both 618S725N and 618S824 are open for 10 seconds or more, a signal
will be sent to trip the circuit breaker 52/T1 at I-226S.
Breaker Monitoring Point
Trigger
Status
618S725N AND 618S824
Open
Trip high side breaker 52/T1 at Garden City (226S).
618S863X
Open
Trip high side breaker 52/T1 at Garden City (226S).
225S4
Open
Trip 225S15 at Magrath substation 225S
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Automatic Remedial Action
Page 10 of 14
Transmission
OPP 515 South Area Operation
Table 4
Summerview – Kettles Hill WPF RAS
Monitoring Point
At Peigan
170LW (59S – 170BL tap)
Runback/Trip
Setting (MVA)
> 140 % of the
static rating:
> 100 % of the
dynamic rating
At Pincher Creek
170LW (T396S – 170AL
tap)
> 140 % of the
static rating:
> 100 % of the
dynamic rating
At Coleman
786L (T799S – BCTC
Natal)
>139
>185
Summer
Winter
>111
>148
Summer
Winter
Automatic Remedial Action
• Trip Summerview WPF generators (34.5 kV breakers –
35CB11 and 35CB21).
• If overload still persists, trip the 138 kV breaker (52-S1) at
Kettles Hill 383S
• Run-back Summerview WPF generators until facility loading
is within limit,
• If overload still persists, run-back Kettles Hill WPF generators
until facility loading is within limit.
• Trip Summerview WPF generators (34.5 kV breakers –
35CB11 and 35CB21)
• If overload still persists, trip the 138 kV breaker (52-S1) at
Kettles Hill 383S
• Run-back Summerview WPF until facility loading is within
limit.
• If overload still persists, run-back Kettles Hill WPF generators
until facility loading is within limit.
• Trip Summerview WPF generators (34.5 kV breakers –
35CB11 and 35CB21).
• If overload still persists, trip the 138 kV breaker (52-S1) at
Kettles Hill 383S
• Run-back Summerview WPF generators until facility loading
is within limit,
• If overload still persists, run-back Kettles Hill WPF generators
until facility loading is within limit.
Note:
• All monitored points have a 10 second time delay to confirm the overload.
• When the loading of the element exceeds the runback setting as specified in Table 4, then a runback signal will be
initiated. After initialization of the runback signal, it is expected that the wind generation runback scheme will
remove the overload in 60 seconds. If the loading of the element has not yet dropped below 100% of its rating
within 90 seconds, then a trip signal will be initiated to trip the WPF.
• Whenever the loading of the element exceeds the trip setting as specified in Table 4, then a trip signal will be
initiated immediately, and overrides the runback signal.
• The maximum continuous rating generated from the DTLR will be limited to 600 A (143 MVA) in the summer and
720 A (172 MVA) in the winter.
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Transmission
OPP 515 South Area Operation
Table 5
Irrican RAS
Monitoring Point
Trigger Status
Automatic Remedial Action
Breaker 67S2 and breaker 67S225
Both open
Trip Irrican Hydro generation.
Breaker 67S820 and breaker 67S225
Both open
Trip Irrican Hydro generation.
Breaker 254S820 and breaker 67S225
Communication link between 67S and 254S
and 67S225
Both Open
Trip Irrican Hydro generation.
Both the link fails and breaker
67S225 open
Trip Irrican Hydro generation.
Breaker 67S3
Open
Trip Irrican Hydro generation.
67S 19LW feeder protection
Operated
Trip Irrican Hydro generation.
67S T1 protection
Operated
Trip Irrican Hydro generation.
67S3 maintenance switch in maintenance
mode
Operated
Trip Irrican Hydro generation.
Lost for more than 4 seconds
Trip Irrican Hydro generation.
Communication link at Irrican
Note:
A breaker is declared “open” by either the breaker status or the maintenance switch operation.
Table 6
Contingency initiated automatic and SC curtailments
N-1 Contingency/
RAS Condition
Possible
Overloaded
Facility(s)
See
Note
911L(59S – 74S)
• 170L(59S-15S)
• 725L(674S725BL Tap)
5
59S T1
• 170L(59S-15S)
• 725L(674S725BL Tap)
5
170L (59S – 15S)
• 725L(674S725BL Tap)
DRAFT 2 Issued for review: 2008-01-28
SC Action1
1. Curtail Soderglen WPF.
2. If overload still persists, curtail Soderglen
WPF to 0 MW.
3. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker at
Soderglen 243S if the Soderglen WPF fails
to curtail.
1. Curtail Soderglen WPF.
2. If overload still persists, curtail Soderglen
WPF to 0 MW.
3. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker at
Soderglen 243S if the Soderglen WPF fails
to curtail.
1. Curtail Soderglen WPF
2. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker at
Soderglen 243S if the Soderglen WPF fails
to curtail.
Curtailment
Ratio2
2.5:1
2.5:1
4:1
Page 12 of 14
Transmission
OPP 515 South Area Operation
N-1 Contingency/
RAS Condition
Possible
Overloaded
Facility(s)
170L(396S – 239S–
799S)
• 170L(383S
Tap-59S)
725L(674S– 111S–
618S)
• 725L(59S –
243S Tap)
• 170L (59S –
15S)
See
Note
4
725L(59S–674S)
• 170L(59S383S Tap)
786L (T799S – B1S)
• 170L (T396S –
59S)
4
170L (T396S – 59S)
• 786L (799S –
Natal)
4
DRAFT 2 Issued for review: 2008-01-28
SC Action1
3. If overload still persists, curtail
Summerview WPF
4. If Soderglen curtailment causes 170L
(383S – 59S) overloaded, further curtail
Summerview WPF
1. Curtail Summerview WPF.
2. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker
(138CB1) at Summerview 354S if the
Summerview WPF fails to curtail.
1. Curtail Soderglen WPF.
2. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker at
Soderglen 243S if the Soderglen WPF fails
to curtail.
3. If overload still persists, curtail
Summerview WPF.
4. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker
(138CB1) at Summerview 354S if the
Summerview WPF fails to curtail.
1. Curtail Summerview WPF.
2. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker
(138CB1) at Summerview 354S if the
Summerview WPF fails to curtail.
1. If overload persists on 170L and is less
than 125 MVA Summer / 151 MVA Winter
then curtail Summerview WPF.
2. If overload persists still on 170L and is
greater than 125 MVA Summer / 151 MVA
Winter and the Summerview WPF does not
curtail generation, then direct the AltaLink
South Transmission Operator to trip the
138 kV breaker (138CB1) at Summerview
354S.
3. If overload still persists, curtail Kettles Hill
WPF.
4. Direct the AltaLink South Transmission
Operator to trip the 138 kV breaker (52-S1)
at Kettles Hill 383S if the Kettles Hill WPF
fails to curtail.
1. Curtail Summerview WPF.
2. If Summerview fails to curtail, direct the
AltaLink South Transmission operator to
trip the 138 kV breaker (138CB1) at
Summerview 354S.
Curtailment
Ratio2
2:1
1.5:1
2:1
2:1
1.5:1
2:1
2:1
Page 13 of 14
Transmission
OPP 515 South Area Operation
Possible
Overloaded
Facility(s)
N-1 Contingency/
RAS Condition
• 225L(67S313S Tap)
• 170L(383S
Tap-59S)
See
Note
SC Action1
Magrath WPF RAS
unavailable
n/a
1. Curtail Taylor WPF.
2. Direct the AltaLink South Transmission
Operator to trip the 69 kV breaker 225S15
at Magrath (T225S) if the Taylor WPF fails
to curtail.
3. If overload persists curtail Irrican
generation
4. If overload still persists on 170L (59S –
383S Tap), curtail Summerview WPF.
1. Curtail Taylor WPF.
2. Direct the AltaLink South Transmission
Operator to trip the 69 kV breaker 225S15
at Magrath (T225S) if the Taylor WPF fails
to curtail.
3. If overload persists curtail Irrican
generation
4. If overload still persists on 170L (59S –
383S Tap), curtail Summerview WPF.
See Section 5.4
Summerview –
Kettles Hill WPF RAS
unavailable
n/a
See Section 5.5
Soderglen WPF RAS
unavailable or loss of
both “A” and ‘B”
teleprotection
channels
n/a
See Section 5.7
863L (618S-226S225S)
225ST1
• 225L(67S313S Tap)
• 170L(383S
Tap-59S)
3
Curtailment
Ratio2
1.5:1
1.5:1
2:1
1.5:1
1.5:1
2:1
n/a
n/a
Note:
1. The required SC actions aim to enabling the system to withstand the contingency (N-1) as listed in above table.
The SC or Operation Coordination Group may take necessary measure(s), if required, to prepare the system to
withstand next contingency (N-1-1) in real time.
2. Curtail this amount of generation (MW) for every 1 MVA of overload on the overloaded facility.
3. Magrath WPF RAS will trip Magrath WPF for breaker ‘open’ condition at Riverbend (T618S) as described in
Table 3.
4. Summerview – Kettles Hill WPF RAS will operate for Summerview/Kettles Hill WPF if loading on any affected
facility is greater than the trigger limits as described in Table 4.
5. Soderglen WPF RAS will operate if loading on any affected facility is greater than the trigger limits as described in
Table 8.
6. A SCC Application has been developed for this table.
Table 7
Contact Information
Confidential
View confidential Table 7
DRAFT 2 Issued for review: 2008-01-28
Page 14 of 14
Transmission
OPP 515 South Area Operation
Table 8
Soderglen RAS
Monitoring Point
Trigger Status
Automatic Remedial Action
At Bowron L674S
725LW terminal
Winter Setting:
>143 MVA (112% of rated capacity)
Trip Soderglen WPF
Summer Setting:
>102 MVA (112% of rated capacity)
Trip Soderglen WPF
Communication link fails
Trip Soderglen WPF*
Communication link between
Peigan and Soderglen
Note:
* Soderglen 138 kV breaker will be tripped within 400 ms in case of a communication failure between Peigan and
Soderglen
7.
Revision History
Issued
Description
2007-09-27
Supersedes 2007-06-14
2007-06-14
Supersedes 2007-03-15
2007-03-15
Supersedes 2006-09-29
2006-09-29
Supersedes interim OPP effective 2006-08-09
2006-08-09
Approved for interim implementation, supercedes 2006-04-27
2006-04-27
Supersedes revised interim OPP effective 2005-07-27
2005-07-27
Supersedes revised interim OPP effective 2005-06-14
2005-06-14
Supersedes interim OPP effective 2005-06-03
2005-06-03
Supersedes OPP effective 2004-10-14
2004-10-14
Supersedes interim OPP effective 2004-07-30
2004-07-30
Approved for interim implementation, effective 2004-07-30
New issue
DRAFT 2 Issued for review: 2008-01-28
Page 15 of 14