Home > Sectoral information > Power,Telecommunications,Signal > Electric Railroad


Electric Railroad and Power
Line Section Operation Contact
Wire		 Substations Power System
Control Center		 Note
SS SP
Total
661.3
1,658.9
23
57
2
I
n
d
u
s
t
r
i
a
l
 Sub-total
486.4
924.2
13
40
1
Jungang
line 		Cheongnyangni
-Yeongju
218.8
469.5
6
18
1 Single
line
Yeongdong
line 		Yeongju
-Donghea
148.5
250.8
4
12
Taebaek
line 		Jecheon
-Baeksan
103.8
184.0
3
10
Others
15.3
20.5
--
--
M
e
t
r
o
p
o
l
i
t
a
n
 Sub-total
174.9
734.7
10
17
1
Gyeongbu
line 		Seoul-Suwon
41.5
266.4
2
5
1 2 double line
Gyeongin
line 		Guro-Incheon
27.0
92.4
1
3
double line
Gyeongwon
line 		Yongsan
-Uijeongbu
31.2
139.2
1
3
double line
Ansan line Geumjeong
-Ansan
19.5
58.1
--
2
double line
Gwacheon
line 		Geumjeong
-Namtaeryeong
14.4
28.5
--
2
double line
Bundang
line 		Suseo-Ori
18.5
65.0
1
2
double line
Ilsan line Jichuk-Daehwa
19.2
51.9
5
--
double line
Other
3.6
33.2
--
--



Electric Railroad Method
Single-phase 25KV method : Industrial line, Metropolitan railway line
BT(Booster Transformer) method : Industrial line
  - Junang line(Cheongnyangni-Jecheon), Taebaek(Jecheon-Baeksan),
Yeongdong(Cheolam-Donghae)
  - Direct connection of BT of 1:1 ratio, every 4km
  - BT Power Supply Route Map
 
AT Method :
  - Metropolitan Area-All lines(except, Ilsan line), Industrial Line-Jungang line
(Jecheon-Yeongju), Yeongdong line(Yeongju-Cheolam)
  - Connecting the transformer line to the neutral point on the rail through
installing AT in 10km intervals between the substations.
  - AT Power Supply Route Map
D.C. 1,500V Method : Seoul city subway, Ilsan Line


Power Supply Facilities
  Electric railroad substations(SS) are based on the scott connection system whereby three-phase electric power is changed into single-phase power which is then supplied to overhead contact lines. Seoul Metropolitan and some sections of the Industrial lines are base on the Autotransformer(AT) feeding. System are supplied with three-phase, 154KF power from the Korea Electric Power Corp.(KEPC), which is transformed to single-phase, 55KV power for overhead contact lines. Substations serving Industrial lines are base on the booster Transformer(BT) feeding system and are supplied with three-phases, 66KV power which is transformed to single-phase, 25KV power.
Seoul Metropolitan lines receive power from the Guro and Uijeongbu, Moran, Gunpo electric railroad stations. An additional seventeen sub-sectioning posts(SSP) are located between the substations at 10km intervals to supply power. Switch operations of individual SS and SSP are controlled by the supervisory control and data acquisition system(SCADA) in the Seoul Power System Control Center.
Thirteen electric railroad substations are located at those sections of the Industrial line. A sectioning post(SP) is also located between the SSs to enable parallel power operation. Additionally, an SSP is located between an SS and SP, to reduce the extent of possible negative effect in case of interruptions to the power supply. The switch operation of individual SS and SP are controlled and monitored by SCADA in the Yeongju Power System Control Center.


Overhead Contact Lines
On-Ground Sections :
  Overhead contact lines of the Metropolitan and Industrial line are base on the Simple Catenary System(Gyeongbu up and down train, and mail line 1 is Heavy Simple Catenary) that suspends overhead contact wires by installing droppers on messenger wires at 10m intervals(metropolitan areas are 5m intervals). Automatic tensioning devices, installed at both end of overhead contact lines with a maximum length of 1,600m, maintain proper tension regardless of weather conditions. On some ordinary sections, overhead contact lines are suspended by electric poles and free brackets, and in stations and yards they are suspended by cross span wires.
Underground Sections :
  Overhead contact lines in the metropolitan underground sections are installed in a rigid body suspension type. The Gwacheon and Bundang line are build in a rigid body R-Bar method, in which electric rail lines can be established or disassembled automatically. However, the Ilsan line is base on the same a rigid body T-Bar method of the Seoul Metropolitan Underground Subway line, with 200m maximum length and a rigid body T-bar between the contact lines are of 현수조가장치.


Power Supply Method
One Source Supply System (machinery signal sections):
  Supplied directly from the Korea Electric Power Corp(KEPC)
Extension Feeding System(electrical signals type 1 and 2 sections):
  Consists of leased high voltage distribution lines of the Korea Railroad(as a precaution against power interruption from KEPC)
Automatic High-Voltage Power Supply System(CTC sections) :
  Centralized remote control system on the leased high voltage distribution line sections. 766km or 25% of total operating distances.