G|S

GRID

F3572.5 - 145 - 170 kV Gas-insulated Substations

The F35 GIS is 3-phase, SF6 gas-insulated,

high voltage metal enclosed substation

designed for indoor and outdoor instal-

lations.

Alstom Grid has been actively involved in

SF6 technology for several decades and our

GIS have been in use worldwide since 1965

with proven success. Excellent reports from

the field confirm the soundness of our tech-

nical concepts.

Proven designThe reliable operation of our F35 GIS is

the result of field-proven design principles,

a purely mechanical operating mechanism,

up to date computer aided design methods

and comprehensive development and

type testing. Our designs are governed by

ISO 9001 and ISO 14001 certified quality

and environmental management systems.

Due to the architectural principles applied

and the new concepts developed, the

F35 switchgear is completely adaptable to

the layouts used in modern electrical

solutions.

The arrangement is suitable for future

extensions or modifications of the equip-

ment. It enables new, original and cost-

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 requires the installation of compact and efficient distribution and transmissionnetworks. High voltage gas-insulated substations (GIS) are ideal for such applications.

effective solutions, while preserving the

necessary operating security and mainte-

nance criteria.

The F35 GIS is fully type tested to meet IEC

and ANSI ratings and requirements.

2

The mechanical drives are simple, contain

few moving parts and do not need any

interphase adjustments.

The organisation of the gas compartments

is optimised so as to require the minimum

number of gaskets: this means excellent

gas-tightness performance.

The enclosures are made of cast/sheet

aluminium. Their shapes are optimised to

meet the most demanding dielectric perfor-

mances.

The aluminium alloys have been selected for

their superior resistance to corrosion.

The switching components are equipped

with position indicators easily readable from

the gangways. Viewing windows to check

the contact position of disconnectors are

also available as an option.

The sealing between flanges is ensured by a

synthetic elastomeric gasket with a specially

designed cross-section providing three

concentric seals: this ensures excellent long-

term gas tightness.

1 Circuit breaker

2 Spring mechanism

3 Combined

disconnector/

earthing switch

4 Make-proof

earthing switch

5 Current transformer

6 Voltage transformer

7 Cable connection

System advantages

Top quality manufacturing and rigorous inspection guarantee excellent performance

The partitioning of the GIS into gas com-

partments is optimised for minimum service

interference during maintenance, extensions

and on site testing.

Each compartment is equipped with desic-

cant to absorb humidity and gas decom-

position products, a pressure relief device,

a density switch or sensor to monitor gas

density and a filling valve.

All connecting conductors are made of

aluminium or copper and are silver-plated

at the joints. The contacts are of the sliding

type to allow expansion without transmit-

ting mechanical stresses to the support

insulators. Finger or tulip contacts are used

for dynamic contacts, along with tungsten

protected contacts for short circuit and load

switching contacts.

Typical busbar bay

1

2

34

5

6

7

3

GAS-INSULATED SUBSTATIONS F35

3

Circuit breakerAlstom Grid has developed a circuit breaker

with three single-phase interrupting elements

contained in the same enclosure. The circuit

breaker uses an innovative and very reliable

spring-operated mechanism, developed

thanks to Alstom Grid’s technical expertise.

Combined 3-position disconnector/earthing switchThe basic element of the device is a moving

contact performing both the disconnector

and earthing switch functions. The design

prevents simultaneous closing of both

switches. Three positions are available for

the contacts:

• Disconnector closed

and earthing switch open

• Disconnector open

and earthing switch open

• Disconnector open

and earthing switch closed

The disconnectors are able to switch the

capacitive charging currents of the busbars

and bus transfer currents in double busbar

substations.

The disconnectors/earthing switches are

operated by an electrical operating mecha-

nism directly attached to the equipment.

GIS Components

The circuit breaker and spring-operated

mechanism are designed and tested for

extensive operation and a long service life

and are virtually maintenance-free.

Combinedcircuit breaker/disconnector The OPTIGIS® solution, based on proven

GIS technology, integrates circuit breaker

and disconnector functionality.

The circuit breaker’s breaking capacity and

the disconnector’s higher insulation level of

the insulating distance is tested via a series

of interrupting tests representing at least

25 years of circuit breaker operation.

Values tested for the circuit breaker/dis-

connector are fully in accordance with IEC

requirements.

Make-proof earthing switchThe moving contacts are activated by a

charged spring for opening and closing.

Make-proof earthing switches are used for

safe earthing of primary circuits, including

closing on short-circuit and switching

induced current.

The position indicator is mechanically linked

to the earthing switch contacts and is easily

visible from the operating level.

The earthing contacts of the make-proof

earthing switch can be electrically insulated

from the enclosures. This allows current

injection for adjustment of the protection

relays and the ability to check the resistance

of the main conductors or the ratings of the

current transformers.


4

High voltage interfaces F35 type switchgear can be directly

connected to high voltage cables, transfor-

mers or overhead lines.

• Connection to high voltage cables

All types and sizes of cables can be con-

nected, according to IEC standards.

The plug-in dry type cable connection is

designed to incorporate cable-end insulators

at IEC standard dimensions.

• Connection to power transformer/

reactor

The F35 can be directly connected to power

transformers/shunt reactors by means of

gas-insulated busducts connected to an

SF6-to-oil compartment which meets IEC

recommendations. Removable links enable

dielectric testing of the GIS at the interface

with the transformer bushings.

• Connection to overhead lines

The F35 GIS connects to overhead lines by

busducts and SF6 air bushings. The compo-

site or porcelain insulators are filled with

SF6 gas. Electric field grading based on

SF6 insulation provides an excellent voltage

surge withstand and guarantees a long

service life.

A range of insulators allows external creep -

age distances to meet specific customer

requirements. Composite insulators are also

lightweight and explosion proof – a valuable

safety feature.

• Interconnection elements

Telescopic coupling elements with sliding

sleeve joints on the conductors allow the

removal and installation of components

for assembly, extension and maintenance

work without dismantling other switchgear

components.

Expansion bellows are provided when

needed to compensate for thermal expansion

movements and tolerances.

Customised instrument transformersThe switchgear is equipped with conventional

instrument transformers housed in standard

enclosures. The technical specifications can

suit all applicable protection and measure-

ment standards and practices.

Voltage transformers are equipped with an

integrated disconnecting facility for GIS and

power cable testing, without any additional

dismantling and gas handling.


5

Local control

Local control is integrated into the switch-

gear. The local control of each bay provides

the following functions:

• Control and monitoring of the bays and

density of the SF6 gas inside the

compartments

• Electrical interlocking between com-

ponents

• Interface between the remote control,

local control and the GIS equipment.

Digital or conventional technology may be

used for these functions.

Digital bay control ensures the control and

measuring functions and provides enhanced

information for the substation and/or

remote control.

The cabling of the GIS devices to the control

cubicle is executed in the factory before

delivery.

Complete factory functional tests of the

control cubicle and GIS configuration are

carried out according to the latest IEC

standards. Thus, minimum time is required

for onsite installation and commissioning.

The control and monitoring system of all

GIS functions enables predictive instead of

preventive maintenance.

Fully tested, easily shipped and erected

The F35 Gas insulated Substation is fully

assembled and fully tested in the factory

according to IEC/ANSI. Up to three bays are

combined in one transport unit, then shipped

to the site. Shipping units are filled with SF6

or dry nitrogen gas at a slight overpressure,

to prevent moisture and dust ingress during

transport. The equipment’s light weight

and compactness considerably simplifies

transport and on site erection.

The bay fixation with adjustable supports

bolted to the floor enables simple and rapid

erection work with minimum requirements

on the concrete floor.

After erection, the complete substation under-

goes final inspection and commissioning

tests. Dielectric tests, including partial

discharge measurements according to the

relevant standards, ensure the dielectric

integrity of the GIS.


6

Applications Single busbar layout 72.5 kV

▲

26

50

▲min 1400 3500

min 5500

600 min 1400 3500 600

min 5500

55

00

40

00

x 3

00

0

6950

1500 3950 1500

650 6501750

▲

▼

▲

▼

▲

▲ ▲

▲

▲▲

▲▲

▲

▲▲▲

▲

▲

▲

▼

▲ ▲▲

▲

▲▲▲▲

▲


7

Applications Double busbar layout 145 kV Double busbar layout 170 kV

1500

800 800 800 800 800 800 800

min 1400 2800

min 5800

40

00

x 3

00

0

58

00

9850

6850

11300

83001500

27

70

min 5800

min 1400 3800 600

min 1400

min 6300

4300

29

25

600

˛

1000 1000 1000 1000 1000 1000 1000

min 6300

45

00

x 3

20

0

63

00

1500 1500

min 1400

▲

▼

▲

▲

▲

▼

▲

▲▲

▲

▲▲

▲

▲

▲ ▲

▲

▲

▲▲

▲

▲

▲

▲

▲

▲

▲

▲

▲

▲

▼

▲

▲

▲

▼

▲

▲

▲

▼

▲ ▲

▲ ▲

▲

▲

▲

▼

▲

▲

▲▲

▲

▲


GRID

Mobile substation

Mobile substations are flexible and effective

solutions and can be customised to the

client’s needs.

Possible applications are temporary replace-

ment of installations with similar voltages

in emergencies caused by upgrades, plant

expansions, prolonged authorisation proces-

ses, breakdowns, short-term peak energy

demands, natural phenomena damage and

maintenance and operation requirements.

Mobile substations are designed for easy

relocation using conventional transportation.

The mobile substations are completely

assembled and tested according to the rele-

vant standards at the factory and include

all connections of the components to the

integrated local control cubicle and to the

common earthing point.

The erection of the mobile substation on

site is quick and simple:

• Connection of the station earth

to the common earthing point

• Connection of the plug-in power cables

to the cable terminations and fixations

on the pre-assembled auxiliary frames

• Connection of the remote control

to the local control cubicle

• Filling of the gas compartments with SF6

to operating levels

With its reduced number of components,

the commissioning and operation of the

mobile substation is easy and safe and does

not require any adjustments before entering

into service.

Rated voltage kV 72.5 145 170

Rated frequency Hz 50/60 50/60 50/60

Withstand voltage to earth:

At power frequency kV 140 275 325

At lightning impulse kV 325 650 750

Short-time withstand current (3 s) kA 31.5 40 50

Rated current A 2500 3150 3150/4000

Relative SF6 pressure at 20 °C:

Filling bar 6.3 6.3 6.3

Alarm bar 5.8 5.8 5.8

Minimum bar 5.5 5.5 5.5

Technical data – General characteristics

Circuit-breaker

Main characteristics

Dimensions (DOUBLE BUSBAR BAY Example)

Short-circuit breaking capacity kA 31.5 40 50

Making capacity (peak value) kA 80/82 100/104 125/130

Operating sequence O – 0.3 s – CO – 3 min – CO

Break time ms 50 50 50

Installation Indoor Indoor/Outdoor Indoor/Outdoor

Ambient temperatures °C –25/+ 40 –25/+ 40 –25/+ 40

Width m 0.65 0.8 1 – 1.2

Depth m 3.3 3.8 4.3

Height m 2.65 2.8 2.9

Gri

d-P

rodu

cts-

L3-F

35

_R

an

ge-

70

87

3-2

01

0_

12

- E

N ©

Copyr

igh

ts A

lsto

m 2

01

0, th

e A

lsto

m lo

go a

nd a

ny

alt

ern

ati

ve v

ersi

on

th

ereo

f are

tra

dem

ark

s an

d s

ervi

ce m

ark

s of

Als

tom

. Th

e oth

er n

am

es m

enti

on

ed, re

gis

tere

d o

r n

ot,

are

th

e pro

per

ty o

f th

eir

resp

ecti

ve c

om

pan

ies.

Th

e te

chn

ical a

nd o

ther

data

con

tain

ed in

th

is d

ocu

men

t are

pro

vided

for

Info

rmati

on

on

ly. N

eith

er A

lsto

m, it

s offi

cers

nor

emplo

yees

acc

ept

resp

on

sibili

ty for

or

shou

ld b

e ta

ken

as

maki

ng a

ny

repre

sen

tati

on

or

warr

an

ty

(wh

eth

er e

xpre

ss o

r im

plie

d)

as

to t

he

acc

ura

cy o

r co

mpIe

ten

ess

of

such

data

or

the

ach

ieve

men

ts o

f an

y pro

ject

ed p

erfo

rman

ce c

rite

ria w

her

e th

ese

are

indic

ate

d. N

o li

abili

ty is

acc

epte

d for

an

y re

lian

ce p

lace

d u

pon

th

e in

form

ati

on

con

tain

ed in

th

is b

roch

ure

. A

Isto

m r

eser

ves

the

righ

t to

rev

ise

or

chan

ge

thes

e data

at

an

y ti

me

wit

hou

t fu

rth

er n

oti

ce. P

rin

ted o

f paper

made

wit

h p

ure

EC

F (

Ele

men

tal C

hlo

rin

e F

ree)

eco

logic

al c

ellu

lose

pro

du

ced f

rom

tre

es g

row

n in

pro

du

ctio

n fore

sts

un

der

res

pon

sible

man

agem

ent,

an

d s

elec

ted r

ecyc

led t

hre

e-la

yer

fibre

s.

Alstom grid Grid Worldwide Contact Centre

www.grid.alstom grid.com/contactcentre/

Tel: +44 (0) 1785 250 070

www.grid.alstom grid.com
