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

field experience confirms 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 benefits

• 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 efficient 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 sufficient

for assembly and maintenance work. The

height adjustable bay frames are bolted

directly to the floor. 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.

2

Highly 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

floor loads, for example, are low and a level

floor is sufficient for erection.

Thanks to the flexibility 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

3

Cross 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

4

Accessible 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 benefits are high availability,

reduced maintenance and low dynamic

floor 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 verifi-

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

5

Customised instrument transformers The ratings for voltage and current trans-

formers are according to customer specifi-

cations for metering and protection

systems.

The current transformer cores are accom-

modated in standardised housings outside

the gas compartments.

The film-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 flanges 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

6

Line 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

7

Layouts

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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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