IEEE Power & Energy Magazine - March/April 2021 - 76

Operational Procedures for the
First-Step Application of the
N−1 Intertrip Scheme

respond after the occurrence of a failure in the short time
available. During the scheduled outage period (including a
continuation of the N−1 failure period), curtailment on a
pro rata basis is introduced from the viewpoint of equal
use (Figure 4).

Operation Method for the N−1
Intertrip Scheme
When there are multiple generators subject to the N−1 intertrip scheme within the same power system, they are tripped
on a last-in, first-out basis, in conformity with the power flow
condition. This is necessary for generators to immediately

Overview of the N−1 Intertrip Scheme
System Configuration
The basic system configuration of the N−1 intertrip scheme
is depicted in Figure 5.

table 4. A demonstration case study of a possible N−1 intertrip application amount.

Electrical Operational
Capacity
Wire
(Single Line)
Type

Available
Capacity
Before the
Application
of the N−1
Ex-Ante
Power Flow Intertrip
Scheme (1)
Value

Operational
Capacity
After the
Application
of the N−1
Intertrip
Scheme

Available
Capacity
After the
Application
of the N−1
Intertrip
Scheme (2)

Increase
Amount
and Increase
Rate (2) - (1) Description

Point

Voltage

Point A

77 kV

ACSR
410

130

130

0

200

70

+70
(+54%)

-

Point B

275 kV

TACSR
610

1,000

930

70

1,270
(770 + 500)

270

+200
(+20%)

Operational
capacity after
the application
of the N−1
intertrip scheme
depends on its
upper control
limit

Point C

77 kV

ACSR
410

130

100

0

200

100

+100
(+77%)

Available
capacity before
the application
of the N−1
intertrip scheme
depends on
Point F

Point D

154 kV

TACSR
410

440

400

0

680

110

+110
(+25%)

Available
capacity
depends on
Point F

Point E

77 kV

ACSR
610

170

100

0

260

160

+160
(+94%)

Available
capacity before
the application
of the N−1
intertrip scheme
depends on
Point F

Point F

275 kV

TACSR
610

1,000

1,000

0

1,270
(770 + 500)

0

0

Operational
capacity after
the application
of the N−1
intertrip scheme
depends on its
upper control
limit

Ex-ante
power flow
1930

After the
interconnection of
the new
generator
2000

After the
interconnection of
the new
generator
2,540

+540
(+28%)

-

Total flow of
system H

(100)
(770)

(100)

(340)

(130)

(770)

ACSR: aluminum conductors steel reinforced; TACSR: thermal-resistant aluminum conductors steel reinforced.

76

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march/april 2021



IEEE Power & Energy Magazine - March/April 2021

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