B65 72.5 - 145 KV Gas-Insulated Susbstations Brochure GB.fr-fR
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Transcript of B65 72.5 - 145 KV Gas-Insulated Susbstations Brochure GB.fr-fR
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GRID
B6572.5 145 kV Gas-insulated Substations
The B65 GIS is single-phase, SF6 gas-
insulated, high voltage metal enclosed
switchgear, which is continuously being
upgraded to the state-of-the-art.
Alstom Grid has been actively involved in
SF6 technology for several decades and
our GIS have been in operation worldwide
since 1965 with proven success. Excellent
eld experience conrms the soundness of
our technical concepts.
Proven design conceptThe single-phase enclosure of the live parts,
consisting of cast aluminium alloy housings,
is systematically applied. Operational
aspects govern the segregation of the gas
compartments by barrier insulators. The
busbars are always segregated at each bay.
The circuit breaker is horizontally arranged
and together with the mechanical operating
mechanism constitutes the heart of the
Customer benets
Flexibility Space saving, high compactness Increased safety and reliability Modularity and adaptability Easier operation Accessibility of components
The increasing demand for electrical power in cities and industrial centres requiresthe installation of a compact and efcient distribution and transmission network.High voltage gas-insulated substations (GIS) are ideal for such applications.
system. The busbars are located above the
horizontal breakers providing convenient
access to all important components. Tele-
scoping busbars between the bays expedite
assembly and enable implementation of
planned and unplanned extensions, as well
as maintenance work with minimal dis-
ruption to normal operations.
The switchgear is delivered in bay modules.
A light-duty hall or boom crane is sufcient
for assembly and maintenance work. The
height adjustable bay frames are bolted
directly to the oor. The local control system
cabinet can be attached directly to the
switchgear, or set up separately.
The open interfaces of the switchgear,
operating mechanisms, instrument trans-
formers, monitoring elements and local
control system simplify the integration into
various station control systems.
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2Highly experienced Alstom Grid has many years of experience
in the design of gas-insulated, high voltage
switchgear rated up to 800 kV.
The buildings that house the switchgear
can be very simple: the static and dynamic
oor loads, for example, are low and a level
oor is sufcient for erection.
Thanks to the exibility of the concept and
the small number of single-phase modules,
any substation layout can be easily
designed.
In case of restricted access to and within
existing buildings, the switchgear is shipped
as single or 3-phase components and
assembled with little extra effort and cost.
The compact B65 modular system also
generally allows the extension of earlier
generation SF6 switchgear.
Gas-insulated switchgear
The long life of the switchgear and the
extended maintenance intervals result in
low lifecycle costs and high availability.
The latest generation of mechanical circuit
breaker operating mechanisms, with trip
and reclose energy storage in compression
springs, ensure constant circuit breaker
readiness.
GAS-INSULATED SUBSTATIONS B65
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3Cross section view
1
2
3
4
7
8
1
5 6
Double busbar bay with cable feeder
1 Earthing switch
2 Busbar disconnector
3 Circuit breaker
4 Spring-operated mechanism
5 Current transformer
6 Feeder disconnector
7 Cable termination enclosure
8 Voltage transformer
GAS-INSULATED SUBSTATIONS B65
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4Accessible circuit breakers The latest developments in self-blast tech-
nology are engineered into these modern
circuit breakers. This keeps switching energy
levels low and allows the optimised inte-
gration of spring-operated mechanisms.
The customer benets are high availability,
reduced maintenance and low dynamic
oor loads.
A new generation of spring-operated
mechanism operates the circuit breaker.
Together with the breaker, it constitutes a
unit and operates the three poles via a
linkage. The energy required for an
OPEN/CLOSE/OPEN cycle is stored per-
manently and free of losses by two built-in
compression springs. The recuperation of
the surplus closing energy and the dashpot
integrated in the mechanism result in low
shock switching operations. This generation
of operating mechanisms is characterised
by a fast rewind action and high reproduci-
bility of switching times.
The circuit breakers and operating mecha-
nisms are easily accessible from the
operator aisle for inspection, servicing and
manual emergency activation in the event
of an auxiliary power loss. The interrupters
can slide into the operator aisle when
maintenance work is required.
Reliable disconnectors Disconnector modules with push-pull con-
tacts are accommodated in standard enclo-
sures. The three poles are mechanically
linked and connected with the position
indicators and the common motor drive
mounted on one of the poles. They reliably
switch capacitive currents, which occur
when switchgear sections are energised or
de-energised, as well as commutation
currents caused by busbar transfers.
The disconnector drives are motors with
gear units and mechanically coupled
auxiliary switches for control and signal-
ling purposes. They are also equipped as
standard for manual emergency operation
and mechanical locking.
The disconnectors have viewing windows
for status and switching-position veri-
cation.
GIS components
Flexible, installable earthing switches Maintenance or make-proof earthing switch
modules can be installed at any location in
the substation.
The 3-pole drive of maintenance earthing
switches is of the same design as the drive
used for disconnectors. For make-proof
earthing switches, the drives are equipped
with springs for fast make/break action.
Accordingly, make proof earthing switches
master closing on short circuits as well as
switching Class B induced currents to
IEC 1129. The standard scope of delivery
includes manual emergency operation
elements and mechanical locking.
An insulated version of earthing switches
also enables access for measurements of
the main circuit. Simple bolted bars provide
safe earth connections for normal service.
The contact position and the status of
the moving contact rod can be observed
through a window in the housing.
GAS-INSULATED SUBSTATIONS B65
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5Customised instrument transformers The ratings for voltage and current trans-
formers are according to customer speci-
cations for metering and protection
systems.
The current transformer cores are accom-
modated in standardised housings outside
the gas compartments.
The lm-insulated voltage transformer
cores are integrated in a sealed housing.
This always constitutes a separate gas
compartment.
The transient overvoltages transmitted by
current and voltage transformers into
secondary circuits comply with the latest
IEC requirements.
Electronic instrument transformers have
been developed as an alternative to
inductive types. The current transformers
are based on the Rogowski coil, the voltage
transformers on the capacitive divider
principle. The characteristics of these highly
advanced instrumentation devices are
described in a separate publication.
Interconnecting components The individual SF6 system components
are assembled directly, or with the aid of
connection modules. All elements have
standardised anges and symmetrical
gasket grooves for the installation of the
proven 3-way seals. Telescoping coupling
elements with sliding sleeve joints on the
conductors allow the removal and installa-
tion of components for assembly, extension
and maintenance work, without dismant-
ling further switchgear parts.
Expansion bellows are provided to equalise
thermal expansion movements and posi-
tioning tolerances.
Interfaces & options Standard modules are available for con-
nection of the switchgear to the high
voltage grid:
SF6 air bushings for transmission lines SF6 oil bushings for direct transformer
connections
Buses with solid insulation Standardised permanent or plug-in
cable terminations
In many cases, plug-in cable terminations
make it possible to install and test cables
without opening the feeder gas compart-
ment of the switchgear.
For condition monitoring purposes, Alstom
Grid provides densimeters, optical arc
monitors, electronic transducers and partial
discharge measuring sensors. In con-
junction with suitable electronic control
monitoring and evaluation systems, these
components allow the periodic or per-
manent supervision of key GIS parameters.
GAS-INSULATED SUBSTATIONS B65
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6Line bay with double busbar and SF6 to air bushing
Transformer bay with double busbar and cable connection
Coupling bay for a double busbar arrangement
Line bay with double busbar and cable connection
Layouts
Double busbar
GAS-INSULATED SUBSTATIONS B65
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7Layouts
Single busbar with dual busbar section disconnectors
Line bay with single busbar and SF6 to air bushing
Transformer bay with single busbar and cable connection
Line bay with single busbar and cable connection
Dual busbar section disconnectors
GAS-INSULATED SUBSTATIONS B65
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GRID
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Th
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Alstom Grid Worldwide Contact Centre
www.grid.alstom.com/contactcentre/
Tel: +44 (0) 1785 250 070
www.grid.alstom.com
Rated voltage kV 145
Rated frequency Hz 50/60
Rated lightning impulse withstand voltage kV 650
Rated lightning impulse withstand voltage,
across disconnector contacts kV 750
Rated power frequency withstand voltage kV 275
Rated power frequency withstand voltage,
across disconnector contacts kV 315
Rated current A 2500 3150
Rated short-circuit breaking current kA 40
Rated peak withstand current kA 100/104
Rated short-time current kA/s 40/3
Rated short-circuit making current kA 100/104
Rated operating sequence of circuit breaker O 0.3 s CO 3 min CO
CO 15 s CO
Min. SF6 gas operating pressure (gauge at 20 C) bar 5.5
Permissible ambient temperature C 25/+40
Enclosure single-phase
Application indoor/outdoor
Operating system circuit breaker spring operated
Bay dimensions (W x D x H) m 1.2 x 3.4 x 2.9
Bay weight, approx. kg 3200
Other values on request
Technical data
GAS-INSULATED SUBSTATIONS B65