Siemens ASG25 User Manual
Sitras ASG25
1- and 2-pole air-insulated switchgear
for AC traction power supply
siemens.com/rail-electrication
The Sitras ASG25® air-insulated switchgear is intended for use in 1- and 2-pole
AC traction power supply systems. It is a type-tested, metal-enclosed switchgear
for indoor installation.
The general concept of the SitrasASG25 is based on a proven technology
offering high reliability and availability. It provides long lifetime, high number of
operating cycles, long lasting insulation properties and low life-cycle costs
Features
• High personnel safety
• High fire safety
• Environment-friendly: minimum use of materials listed in directives
67/548/EEC and 2001/59/EC
• Low life-cycle costs
• High availability
• Fast and easy replacement of the vacuum circuit-breaker by use of
tulip contacts
Design
Mechanical design
Frame
• The base frame, door and outer walls are made of screw/
rivet connected steel sheets with 2 mm thickness
• Hinged plates (pressure relief flaps) are installed on top
for pressure relief in case of internal arc faults
• Doors and side walls are painted; galvanized steel sheets
are used for all other parts
Busbars
• Busbars are supported by standard cast-resin post
insulators and bushings
• Busbars can be easily connected by links after cubicle
arrangement on site
• Partitioning of busbar compartment by insulating plate
and bushing
• Busbars can be earthed (see option 9 on page 6)
D
High voltage compartment
• Pressure resistant inspection windows for
− visible position of disconnector and earthing switch
− status indication of vacuum circuit-breaker (ON/OFF,
proven spring charging technology, operation counter)
• Insulating protection plate for safe maintenance while
busbar is energized
Low voltage compartment
Control cables for external connections are led from the
bottom to the low voltage compartment via cable duct or
through flange plate at the top.
All wirings may be provided in non-halogen variants on
request.
Service truck
Thanks to the plug-in / plug-out technology with tulip
contacts, the vacuum circuit-breaker can be fast and conveniently replaced using the easy to handle service truck.
P
9
1 1
2
3
7
12
6
11
B
5
L
1 Busbar
2 Disconnector
3 Earthing switch
4 Vacuum circuit-breaker
5 Current transformer
6 Capacitive voltage detection
system
7 Cable sealing end from rear
(Option)
9 Busbar voltage transformer
(Option)
4
11 Voltage transformer (Option)
12 Surge arrester (Option)
L Low voltage compartment
P Pressure relief channel
B Bearing for insulating
protection plate
D Depth
H1 Height switchgear
H2 Height pressure relief channel
W1 Width 1-pole version
W2 Width 2-pole version
Schematic layout of Sitras ASG25 (shown example: 2-pole version with option cable sealing end from rear)
2
Electrical design
Cable connections
• Cable connections from bottom up to 4 x 500 mm² per
feeder
• Cable connections from rear available as an option
• Surge arrester available as an option
High voltage compartment
• Switching devices
− vacuum circuit-breaker, motor operated
− disconnector and earthing switch, manual or motor
operated
− manual emergency operation possible for all switching
devices
• Interlocking between vacuum circuit-breaker,
disconnector and earthing switch
• Measurement transformers for control and protection
W1
Low voltage compartment
• Protection relay and user interface are installed in the
door of the low voltage compartment
• Miniature circuit-breakers and auxiliary relays are
located inside the low voltage compartment
• Connection between the vacuum circuit-breaker and the
low voltage compartment is made via a 64-pin plug
and-socket arrangement
W2
H2 H2
H1 H1
Front view of Sitras ASG25: 1-pole version (left) and 2-pole version (right)
3
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