Transmission & Distribution
SB6 123-245 kV - SF6 circuit breaker
SB6
SF6 circuit breaker
with gas – dynamic
operating mechanism
Powerful
Up to 50Ka Isc
10.000 CO mechanical
endurance
Simple
Poles are delivered
complete and ready
to operate:
Fit them onto the simple
structure
Fill up the SF6 gas
Plug-in the electrical
connectors
……….operate
Integrated pole + operating
mechanism,self – contained
architecture
Free lay – out
Reliable
Protected stoperating
mechanism
Only static SF6 to air seals
“Sealed for life” concept
40 years experience of puffer
interrupter
Safe
All moving parts housed
Tested seismic capability 0,5g
A.
B.
C.
D.
E.
F.
Interrupter
Insulating, support column
Operating mechanism
Local Control Cubicle
Interconnection cables
Support structure
DESIGN
Each breaker consists of three identical poles, each one is a complete functional unit comprising the
interrupter,
the insulating column and a power actuator driven by the SF6 gas of the pole in a closed cycle.
Each pole is installed over a small simple lattice structure.
A local control cubicle (LCC) provides for the control of the three-pole unit, connected to each pole via
cable(s)
with plug-in gas-tight connector(s).
The density switch of each pole is installed inside the operating mechanism enclosure.
A glass window allows to see the mechanical position indicator.
A design combining simplicity, reliability and safety
Only one technique provides insulation, current interruption and contacts operation.
The breaking chambers and the operating mechanism are totally enclosed, assembled
and factory tested, for minimum on site works and optimized maintenance.
Static interfaces between SF6 and atmosphere : no dynamic revolving or sliding joints.
Routine maintenance is unnecessary and environment is protected.
Safety is improved as there are no accessible moving parts.
No mechanical assembly on site related to operating mechanism ( no pipes, no ganging,
no setting).
Application
Outdoor installation in AIS substations
Protection of lines, cables, reactors and capacitors
Standards : IEC 60056 and 62271-100
GAS DYNAMIC OPERATING MECHANISM PRINCIPLE
The energy for actuating the main contacts is provided by SF6 pressure differential between :
The volume formed by interrupter and the insulating column (1)
The volume of the operating mechanism enclosure (2)
Opening (fig 1):
The interrupter (1) is at rated normal SF6 pressure for insulation and interruption. The mechanism (2) is
low pressure rated.
Opening (fig 2):
On control signal, the valve group (3) directs the gas in the front of piston (4) to open the contact. At the
end of the operation
the driving gas inside the cylinder is released to expansion volume (2).
Gas recovery (fig 3):
A sealed compressor (5) housed inside the expansion enclosure (2) restores the pressure in the upper
chamber.
Closing (fig 4):
On control signal, the valve group (3) directs the gas behind the piston (4) to close the contact. At the
end of the operation
the driving gas inside the cylinder is released to expansion volume (2).
Closing (fig 5):
The sealed compressor (5) restores the pressure in the upper chamber.
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.
N.
O.
P.
Q.
R.
S.
T.
U.
A.
B.
HV terminal
Fixed arcing contact
Nozzle
Moving main contact
Upper porcelain insulator
Insulating rod
Opening valve group
Closing valve group
Auxiliary contacts
Compressor
Gas filling valve
Plug-in electric connector
Density switch
Spring toggle device
Double effect piston
Filter
Lower porcelain insulator
Moving arcing contact
Fixed main contact
Molecular sieves
Coils
High pressure volume
Low pressure volume
s
MAIN CHARACTERISTICS
Rated voltage Ur
kVrms
123
145
170
Interrupters / pole
nr
1
1
1
SB6 123
SB6 145
Type
Rated frequency Fr
SB6 170
245
SB6 245
50 / 60
Hz
Insulation levels
- Power frequency
- BIL 1,2/50ms
kVrms
230
275
325
460 (*)
kVp
550
650
750
1050 (**)
Rated continuous current Ir
Α
3150
3150-4000
Symmetrical breaking capacity Isc
kA
31,5 - 40
31,5 - 40 -50
Making capacity
kAp
2,5 times Isc (50Hz) - 2,6 times Isc (60Hz)
s
1-3
Rated break time
ms
50
Rayed closing time
ms
Duration of short circuit
<70
O-0,3s-CO-3min-CO or O.0,3s-CO-1min-CO or CO-15s-CO
Operating sequence
Minimum creepage distance
mm/kV
according to pollution levels of IEC 60815
Ambient temperature range
°C
-25 to + 55
Seismic capability
g
0,3 / 0,5
(*) a version is also available for 530kV to earth and / or across open gap
(**) a version is also available for 1200kVp to earth and / or across open gap
Installation
easy erection pole by pole transported as a complete
unit
installation without need of a specialist (no
adjustments no dismantling or re-assembly)
extremely simple civil works (no need of tight
tolerances)
pre-wired LCC
half a day installation time
simplified adaptation to existing civil works
Tests
CB type tested according to
IEC Standards
Seismic tested 0,5g
before delivery each CB
must pass routine tests in
accordance with IEC
for each CB a routine test
report is issued with actual
test results
Maintenance
for many applications , interrupters can be
considered maintenance free(electric endurance
>800kA cumulated under short circuit conditons)
only periodic non-invasive checks suggested
inspection after 5000 operations
Notes
modules and columns are
transported with SF6 at
0.04 barg ; 1st filling gas
cylinders remain
customer's property
gas and / or support
structure can be excluded
from the supply on request
primary and earthing
clamps can be supplied
on request
the factory is certified
Limits of standard supply
The supply normally includes :
poles with brown porcelains
standard insulator creepage 25mm/kV
support structure per pole
LCC and cables to poles
SF6 gas for 1st filling
set of accessories for site assembly (no standard
tools included)
aluminium terminal pads drilled to IEC/NEMA,
single sided
earthing connection points on structures
standard centre-line distances
O-CO-CO stored operations
a.c. motor supply
Dimensions: type/mm
SB6 123 / 145
SB6 170
SB6 245
SB6 245 extended
Main options
overpressure relief device on poles
extended creepage 31mm/kV and higher
synchronized switching
grey porcelains
customized phase distances
different terminal pads or double sided
undervoltage tripping coil
specific versions for –30° or –35°C
d.c. supply for the motor
A
B
C
D
E
F
G
I
CB mass kg
2575
3900
5350
800
1800
390
620
2200
1800
2575
4090
5730
800
1800
390
620
2500
2160
2575
4535
6520
800
1800
390
620
3200
2700
2575
4735
7020
800
1800
390
620
3200
3050
Design, data, dimensions are indicative and subject to change without notice
SB6g-A-EN
VA TECH Transmission & Distribution GmbH & Co KEG
Penzinger Straße 76, A-1141 Vienna
Tel.: ++43/1/89 100, Fax: ++43/1/89 100-196
E-Mail: contact@vatech-td.at, www.vatech-td.com
VA TECH T&D Spain
Calle Consejo de Ciento,304 2 2 08007 Barcelona
Telf. +34 93 2724250 Fax +34 93 2724251
E-mail: td@td.vatech.es