GRID

B105170 – 300 kV Gas-insulated Substations

The B105 is single-phase, SF6 gas-insulated,

high voltage metal-enclosed switchgear,

which is continuously being upgraded to

the state of the art.

ALSTOM­has­been­actively­involved­in­SF6

technology­for­several­decades­and­our­GIS

have­been­in­operation­worldwide­since

1965­– with­proven­success.­Excellent­field

experience­confirms­the­soundness­of­our

technical­concepts.

Customer benefits

•­­Minimum floor space requirements

•­­Insulated system unaffected

by environmental conditions

•­­Modular design

•­­Almost unlimited extension

and modification possibilities

•­­High operational reliability

•­­Simple maintenance

•­­Long service life expectancy

The increasing demand for electrical power in cities and industrial centres neces-sitates the installation of a compact and efficient distribution and transmissionnetwork. High voltage gas-insulated switchgear (GIS) is ideal for such applications.

GAS-INSULATED SUBSTATIONS B105

2

Proven design concepts B105­modular­switchgear­consists­of­com-

ponents­which­permit­the­realisation­of

both­simple­and­complex­station­layouts.­

The­reliable­operation­of­our­SF6 GIS­units

is­based­on­field-proven­design­principles,

purely­mechanical­drives,­up­to­date­com-

puter­assisted­design­methods­and­com-

prehensive­development­and­type­testing,­

of­which­all­are­governed­by­our­ISO­9001

and­ISO­14001­certified­quality­control­

system.­

The­busbars­arranged­over­the­circuit­brea-

ker­permit­easy­access­to­all­station­com-

ponents.­Any­maintenance­of­the­circuit

breaker­can­be­easily­performed­from­the

front­ground-level­walkway.­

Standardised­flanges,­telescopic­couplings

and­bay-by-bay­compartments­allow­

for­planned­or­unplanned­extensions­and­

servicing,­with­minimal­impact­on­the­

operational­availability­of­the­substation.

Each­phase­of­the­B105­is­divided­into­

several­gas­compartments­using­closed­gas

barriers.­Each­gas­compartment­is­indivi-

dually­monitored­and­contains­moisture­

absorbing­desiccant­and­a­pressure­relief

device.

Proven systems advantages The­extensive­use­of­aluminium­results­in

low­system­weights­and­floor­loading.

Light-duty­hoisting­equipment­is­sufficient

for­the­installation­and­maintenance­of­the

switchgear.­

Installation­is­based­on­site­assembly­of

standard­transportation­components­which

are­factory­tested­for­functionality,­dielectric

withstand­and­leaktightness.­The­modular

design­of­the­GIS­facilitates­erection,­even

when­space­is­limited­and­without­extra-

ordinary­precautions.

The­cast­aluminium­enclosures­(used­suc-

cessfully­by­ALSTOM­for­many­years)­are

Double busbar bay

with outgoing cable feeder

1 Earthing­switch­

2 Busbar­disconnector

3 Circuit­breaker

4 Spring­operating­mechanism

5 Current­transformer

6 Feeder­disconnector

7 Cable­termination­enclosure

8 Voltage­transformer

A highly reliable modular design

dielectrically­optimised­and­comply­with­the

relevant­pressure­vessel­codes.

In­conjunction­with­the­pressure­relief­

system,­they­assure­maximum­safety­for

operating­personnel­and­equipment.­

Minimum­gas­leakage­is­guaranteed­during

the­service­life­of­the­GIS­by­the­use­of­

a­mechanically­and­chemically­resistant

sealing­system,­together­with­comprehensive

quality­control­methods.­

The­metallic­continuous­enclosure­con-

nected­to­the­station­earthing­grid­guaran-

tees­that­the­electromagnetic­field­strength

in­the­switchgear­room­is­harmless­to­both

personnel­and­auxiliary­equipment.­The

transient­overvoltages­that­may­be­coupled

into­the­control­and­instrumentation­circuits

comply­with­the­latest­IEC­requirements.

Cross section view

4

5 6

7

2

1

3

1

8

6

3

Accessible circuit breakersThe­development­of­the­breaking­element

design­is­based­on­the­following­fundamen-

tal­principles:­

• Incorporation­of­the­excellent­operating

reliability­of­the­existing­design,­proven

over­many­years­in­service.­­

• Leverage­the­latest­advances­in­plasma

physics.­­

• Circuit­breaker­performance­meeting­all

latest­IEC­and­ANSI­standards.­

The­circuit­breaker­with­its­mechanism­

underneath­is­installed­within­the­GIS­in­

a­horizontal­position.­

High performance operating mechanismsEach­circuit­breaker­pole­is­driven­by­a­

proven,­purely­mechanical­spring-operated

mechanism.­The­mechanisms­have­only

very­few­moving­parts,­require­minimal

maintenance­and­have­extremely­long­

service­lives.­The­energy­for­two­OPEN­and

one­CLOSE­operations­is­permanently­

stored­in­the­tensioned­springs­in­a­loss-free

manner.­The­simple­design­of­the­operating

mechanisms­ensures­superior­reliability.­

Reliable disconnectors The­contact­element­is­installed­in­a­discon-

nector­enclosure.­The­three­disconnector

poles­are­mechanically­coupled­to­each­other

via­an­operating­linkage­and­actuated­by­

a­common­motor­drive.­They­can­switch­

capacitive­currents­encountered­in­the­course

of­energising­or­de-energising­portions­of

the­GIS­and­loop­currents­when­commuting

currents­from­one­busbar­to­another.­

Clear­and­safe­indication­of­the­main­contacts

position­is­provided­by­a­reliable­indicator

directly­fitted­to­the­linkage.­This­indi­cator­is

clearly­visible­from­the­operating­level.­

GIS components

Reliable earthing switches The­earthing­switches­are­compatible­with

most­plant­components.­They­are­available

in­maintenance­and­make-proof­versions

and­can­be­installed­anywhere­within­the

GIS­in­accordance­with­the­user's­protection

concept.

Additionally,­the­maintenance­and­make-

proof­earthing­switch­can­be­electrically­

insulated­from­the­enclosures­simply­by­

removing­the­external­links.­This­enables

the­performance­of­current­or­voltage­

injection­tests,­for­timing,­resistance­mea-

surement­or­protection­check­purposes.­

GAS-INSULATED SUBSTATIONS B105

4

Customised instrument transformers B105­switchgear­is­equipped­with­conven-

tional­or­non-conventional­electronic­instru-

ment­transformers.­These­are­always­custo-

­mised­to­the­customer’s­needs.­The­technical

data­therefore­reflects­the­customer’s­distri-

bution,­protection­and­instrumentation­

configuration.

The­active­elements­of­the­transformers­are

installed­in­standard­enclosures­which­can

be­mounted­practically­anywhere­in­the­GIS

layout.­

Standard terminationsCables,­overhead­lines­and­transformers­

can­all­be­connected­to­their­respective­

GIS­interface­components.­These­include

outdoor­SF6 to­air­bushings,­cable­termi-

nations­and­direct­transformer­connections.­

All­components­comply­with­IEC­recommen-

dations.­

Interconnecting components The­various­components­of­the­GIS­are­

assembled­by­means­of­standardised­bolted

flanges.­Interconnecting­components­are

comprised­of­aluminium­enclosures­with­

insulator-supported­conductors.­

Telescopic­coupling­elements­(in­busbars­

for­example)­are­used­to­connect­adjacent

switchgear­sections.­

Expansion­elements­with­metal­bellows­

are­used­to­compensate­for­thermal­expan-

sion/contraction­cycles­and­positional­

tolerances­in­both­lateral­and­longitudinal

directions.

GAS-INSULATED SUBSTATIONS B105

5

Tests, assembly, maintenance

Reliable type and routine tests Type­tests­are­carried­out­according­to­the

latest­IEC­standards.­

For­some­features,­IEC­requirements­are

even­supplemented­by­additional­tests,­

or­more­severe­test­conditions­to­match

ALSTOM’s­own­superior­standards­of­

quality.­

Our­modern­workshops,­with­dust-free­

assembling­halls,­ensure­the­same­rigorous

policies­apply­for­routine­tests.­For­instance,

partial­discharge­measurement­is­performed

at­quite­a­higher­voltage­than­required­by

IEC­standards.­

Quick site erectionThe­fixing­of­the­GIS­equipment­is­easily

achieved­with­anchor­bolts­directly­into­the

foundation,­with­no­need­for­embedded

rails:­holes­are­drilled­directly­into­the­foun-

dation.­

Simple transport and on-site tests Shipping­units­are­filled­with­SF6 or­N2 gas

at­a­slight­overpressure,­to­prevent­moisture

and­dust­ingress­during­transport.­

After­site­erection,­the­equipment­under-

goes­rigorous­inspections­to­ensure­all­

required­performances.­Thus,­site­tests­

include­severe­resistance­measurements

and­mecha­nical­and­voltage­withstand­tests.­

Minimal maintenanceThe­B105­near-zero­maintenance­concept

delivers­high­reliability­and­availability­with

only­occasional­inspections­and­a­guaran-

teed­long­life­expectancy­for­all­mechanical

and­electrical­parts.­

The­ALSTOM­service­team­remains­at­the

customer’s­disposal­for­any­assistance­and

service.­

An­inspection­and­maintenance­plan­can

also­be­established­to­support­the­equip-

ment­throughout­its­entire­lifecycle.

GAS-INSULATED SUBSTATIONS B105

6

Layout

Double busbar

1500

10500 25001200

1500

3000

D1 D2 D3 D4 D5 D6 D7

8400

12001200

12001500 12001500120010500 12002500

1200

8400

1200

3000

D1 D2 D3 D4 D5 D6 D7

D1 D2 D3 D4 D5 D6 D7D3 D4 D5 D6 D7D2D1

GAS-INSULATED SUBSTATIONS B105

7

800 1600 5000 1000

800 1600 3800

800 1600 5000 1000

800 1600 3800 2200

2200

3700

min. 650

800

800800800800

800

800

1600 3800

5000

3800

5000

2200

1000

1000

1600

1600

1600

2200

3700

min. 650 D1, D7

Transformer bays with SF6

to air bushings

D5

Transformer bay with

outgoing feeder

D4

Coupler bay

D2, D3, D6

Line bays

GAS-INSULATED SUBSTATIONS B105

GRID

Technical data

Rated voltage kV up to 300

Rated frequency Hz up to 60

Rated lightning impulse withstand voltage, phase-ground kV up to 1050

Rated lightning impulse withstand voltage across disconnector contacts kV 1256

Rated power frequency withstand voltage, phase-ground kV up to 460

Rated power frequency withstand voltage across disconnector contacts kV 605

Rated current A up to 4000

Rated peak withstand current kA up to 170

Rated short-time current kA up to 63

Min. gas operating pressure – Switchgear bar 5.5

– Circuit breaker (gauge at 20 °C) bar 5.5

Auxiliary voltage V 110/220 DC or AC

Enclosure single-phase

Installation indoor/outdoor

Permissible ambient temperature °C –25/+55

Bay dimensions (W x D x H) m 1.5/1.85 x 5.0 x 3.7/4.2

Bay weight approx. kg 5800/6400

General

Circuit-breaker

Earthing switch

Disconnector and maintenance earthing switch

Rated short-circuit breaking current kA up to 63

Rated short-circuit making current kA up to 170

Break time ms 50

Closing time ms 115

Type of operating mechanism single-pole, spring-operated

Power consumption of operating mechanism (spring winding) W 3 x 800

Rated operating sequence O – 0.3 s – CO – 3 min – CO/CO – 15 s – CO

Power consumption of trip or closing coil, approx. W 3 x 350

Rated short-circuit making current kA up to 170

Power consumption of operating mechanism (spring winding) approx. W 150

Power consumption of motor drive, approx. W 150

Other values on request

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Alstom Grid Worldwide Contact Centre

www.grid.alstom.com/contactcentre/

Tel: +44 (0) 1785 250 070

www.grid.alstom.com

GAS-INSULATED SUBSTATIONS B105