Transcript North Mankato 115 kv plan

North Mankato
Load Serving study
Xcel Energy
Great River Energy
Study Area:
To Blue Lake
To Arlington
EXISTING SYSTEM
Henderson
St. Thomas
New switching
station at Le Sueur
tap
Montgomery
City of Le Sueur
X
N.O
X
Traverse
Lake Emily
New Sweden
City of St. Peter
N.O
Le Center
Cleveland
Traverse
Switching station
345 kV line
Existing115 kV line
Planned 115 kV line
Existing 69 kV line
69 kV line upgrade
Penelope
To Johnson
Jamestown
To Loon Tap
To LGS
Eagle Lake
(NSP)
Eagle Lake
(GRE)
Wilmarth
To Waterville
Eastwood
System Characteristics
• Major loads include Cities of Lesure and St.
Peter
• Only two strong sources from Wilmarth.
• Long 69 kV lines.
Critical contingencies (2012):
Contingency
Branch Overload
Wilmarth – Penelope Cleveland – Jamestown tap
Overload Bus
145 %
Eagle Lake Cleveland –
St. Thomas
Voltage
91.5 %
Wilmarth – Eagle
Lake
Wilmarth –Traverse
109 %
Cleveland –
St. Thomas
88 %
Traverse – St. Peter
Jamestown – Cleveland
130 %
St. Peter –
Cleveland –
St. Thomas
86.5 %
Critical contingencies continued:
Contingency
Le Sueur – Le Sueur
Tap
Branch Overload
Cleveland – Le Center
Overload Bus
102 %
Le Sueur –
Montgomery
Loss of Cleveland – Le
Center
Traverse – New Sweden 104 %
Le Center –
St. Thomas
Voltage
88.6 %
90.8 %
To Arlington
To Blue Lake
OPTION 1
Henderson
St. Thomas
2x7.5 MVAR cap
Montgomery
City of Le Sueur
X
New Sweden
Traverse
Lake Emily
N.O
City of St. Peter
New Rush River
switching station
Le Center
Cleveland 115/69 kV
substation
Traverse
345 kV line
Existing115 kV line
Planned 115 kV line
Existing 69 kV line
69 kV line upgrade
Penelope
To Johnson
Jamestown
To Loon Tap
To LGS
Eagle Lake
(NSP)
Eagle Lake
(GRE)
Wilmarth
Duck Lake
switching station
To Waterville
Eastwood
To Blue Lake
To Arlington
OPTION 2
Helena 345/115 kV
substation
Henderson
St. Thomas
New switching
station at Le Sueur
tap
St. Thomas 115/69 kV
substation
Montgomery
City of Le Sueur
X
Traverse
Lake Emily
New Sweden
City of St. Peter
N.O
Le Center
Cleveland
Traverse
Switching station
345 kV line
Existing115 kV line
Planned 115 kV line
Existing 69 kV line
69 kV line upgrade
Penelope
To Johnson
Jamestown
To Loon Tap
To LGS
Eagle Lake
(NSP)
Eagle Lake
(GRE)
Wilmarth
To Waterville
Eastwood
Preferred Plan:
• Preferred Plan is option 2.
• Relatively inexpensive.
• Scope for future 115 kV line additions from
Helena substation.
Other Concerns:
• SPS to trip the Helena – St. Thomas line for the loss of
Helena – Wilmarth or Helena – Blue Lake 345 kV lines.
• The inservice date for this project depends on the
inservice date of Helena 345 kV substation. The project
schedules has to be coordinated with the Southwest
Minnesota – Twin cities 345 kV line.
Questions?