.

Transformer Bushings for GIS

Oil to SF6 Connections

GARIP RTKG 72.5 - 550 kV

Bushings

SQS certifiedISO 9001 / ISO 14001

In modern metal enclosed switchgear SF6 - gas is usedas an extinguishing and insulating medium, ensuringhighest security standard for operating staff and resi-dents, especially in most confined and dense populatedareas.As a result, today’s space saving design requires excel-lent mechanical and electrical performance of all com-ponents involved.Micafil’s contribution to this world -wide development isit’s new product range of GARIP bushings. These havebeen designed for the direct single phase connectionbetween power transformers and gas insulated switch-gear (GIS) for rated voltages of 72.5 kV up to 550 kV.

Since more than 40 years Micafil AG produces high vol-tage bushings made with Vacuum Resin ImpregnatedPaper Technology (RIP).We are proud of our leading position in this field, makingavailable to our customers profound expertise in thelatest state of the art technology, which is based uponmore than 50000 RIP - bushings successful in operation.

The insulation body of the GARIP condenser bushingseries consists of a robust and solid core, made ofwound crepe paper and inserted aluminium foils for fieldcontrol, carefully vacuum dried and subsequentlyimpregnated with special epoxy resin.

The basic procedure for this new kind of manufacturewas originally developed by Micafil AG in Switzerlandalready in 1958 and continuously improved in the courseof four decades.

Advanced standardisation, highly skilled craftsmanshipand computer-aided engineering guarantee today’smost reliable and advanced insulation system for everyvoltage level.

Main advantages of Micafil’sRIP- technology

• Short delivery times

• Low dielectric losses (tan δ ~ 0.35%)

• Partial discharge free up to double service voltage

• Fully dry, maintenance free

• Oil - free and environmental friendly

• Highest mechanical and thermal properties

• Robust design and vandalism resistant

• Option for any operating position

• Gas and oil tight

• Easy handling

RIP - Technology for SF6 /Oil - Bushings

2

.

Design and Accessories

3

Manufacturing of the main RIP - insulating body includesthe solid and non- removable conductor, resulting in aperfect reliable structure, matching today’s stringentelectrical, thermal and mechanical requirements.

Main features of the SF6 interfaceDimensions and physical properties of GARIP type bu-shings fully comply with all standard aspects accordingto IEC publication 61639.This enables complete compatibility of the interface forboth, producers of transformers and GIS manufacturers.The specifically shaped head both acts as silver-coatedterminal with tapped holes as well as epoxy - coated highvoltage electrode. Therefore additional shields are notnecessary. Only adjacent conductor parts should be welladapted to the bushing terminal.

Intended for the whole range of rated voltages from 72.5to 550 kV, Micafil’s GARIP bushings are specified up to750 kPa working pressure SF6 in the GIS.Our new series of GARIP bushings require minimumfunctional SF6 - gas pressures of 350 kPa (72.5 - 420 kV)and 390 kPa (525 kV) respectively.

Flange designAll flanges are made of corrosion proof aluminiumalloys. Standard equipment encompasses a test tap, fourthreads at the transformer side flange plate either forgrounding or as forcing threads and a de - aeration onthe transformer side.A set of most advanced seals between the main insula-ting RIP - body and the flange systems guarantees per-manent gas and oil tightness during operation.

Test tapAll GARIP bushings include a self - grounded test tapconnecting the outer control layer of the RIP - body forcapacitance and tang measurement on site.

Main features of the transformer interfaceThe scope of new GARIP bushings offers CT spaces of0, 300, and 600 mm as a standard equipment (note:L6min = 100 mm for 170 kV types).Special shields, which are dismountable for betterhandling, are supplied for all bushings with rated voltagegreater than 72.5 kV.

Customised design for every Oil / SF6 application is avai-lable on request.

Technical Data and Dimensions

4

RTKG 362-1300 / 2000RTKG 420-1550 / 2000RTKG 525-1800 / 2000

RTKG 72.5 -350 / 2000RTKG 72.5 -350 / 2500RTKG 123-550 / 2000RTKG 123-550 / 2500RTKG 145-650 / 2000RTKG 170-750 / 2000

RTKG 245-1050 / 2000RTKG 245-1050 / 2500

View A:SF6 side

View A:SF6 side

View B:Oil side

View B:Oil side

RTKG 170-750 / 2500

Flange dimensions for:D13D14

D10D9

D8

D2D5

Test tap

n11 x Øw

n11 x Øwn11 x Øwn11 x Øw

n3 x Øv

n3 x Øvn3 x Øvn3 x Øv

M12 (2 x180°)

M12 (2 x180°)M12 (2 x180°)M12 (2 x180°)M12 (2 x180°)M12 (2 x180°)M12 (2 x180°)

M12 (2 x180°)

Groundedlength

Copper,thickness 30 mm

De-aeration of transformeropposite to test tap

De-aeration of transformeropposite to test tap

Sealing areaRa =1.6 (N7)

Aluminium,silver plated

4 x M1225 deep

Sealing areaRa = 3.2 (N8)

22.5°

15° 30°15° 30°

22.5°11.5° 22.5°11.5°

22.5°11.5°

45°

22.5°45°

22.5°45°

D7

Ø18

d4d5d6

D1

40

s1s2

20L6

2011

5

c6D

4

D3 D4

D3

D4

D3

D4

D3

D12

D11

D12

D11D12

D11

D12

D11

L16

LFL2

L

20

85

80A

B

Dimensiondrawing

Flangedimensions for:

Types 123kV - 245 kV

Types 362kV - 525 kV

Shields removable

prospectus No. D 4352 E

.

5prospectus No. D 4352 E

Technical Data and Dimensions1

23

45

67

89

1011

1213

1415

1617

1819

2021

2223

2425

2627

2829

3031

3233

3435

3637

3839

4041

4243

44

Die

lect

ric d

ata

Dim

ensi

ons

of th

e bu

shin

gT

ype

IEC

601

37IE

EE

C57

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01-2

000

Con

duct

orlo

adin

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echa

nica

lde

sign

Adj

acen

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ide

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and

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l sid

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e,S

F6 s

ide

Cor

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F6 s

ide

Ter

min

alS

F6 s

ide

Rated voltage Ur

Ur / √3

AC test voltage

BIL 1,2/50µs

SIL 250/2500µs

System voltage

to-ground voltage

AC test voltage

BIL 1,2/50µs

SIL 250/2500µs

current

short time

Weight

load, 1 Min.

bending momenton the flange

operating

DG

IS

min

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L6L1

6D

1D

7c6

d4d5

d6LF

s1s2

D2

D3

D4

D5

n3 x

Øv

D9

D10

D11

D12

n11

x Ø

wL2

D8

D13

D14

Con

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for

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GA

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RT

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kVkV

kVkV

kVkV

kVkV

AkA

kgkN

kNm

kPa

(abs

)m

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mm

mn

x m

mm

mm

mm

mm

mn

x m

mm

m

RT

KG

72.

5-35

0/20

0072

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140

325

-69

4416

035

0-

2400

2200

2000

6037 48 58

45

350

250

770

1070

1370

0 300

600

175

475

775

130

90-

52-

-15

020

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525

029

022

08

x Ø

1620

026

028

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58

x Ø

1633

013

099

70

RT

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72.

5-35

0/25

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3000

2700

2450

7545 60 75

45

350

250

770

1070

1370

0 300

600

175

475

775

130

110

-52

--

150

2020

165

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290

220

8 x

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200

260

285

315

8 x

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330

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9970

RT

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123

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371

230

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7318

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0-

2200

2040

1900

5549 59 69

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350

300

1180

1480

1780

0 300

600

310

610

910

130

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107

160

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2020

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290

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305

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130

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123

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0-

2850

2650

2500

7165 80 95

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300

1180

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1780

0 300

600

310

610

910

130

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5214

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70

RT

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310

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0020

0019

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51 61 714

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012

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360

660

960

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107

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170

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0-

2100

2000

1900

5355 62 72

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350

300

1390

1590

1890

100

300

600

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720

1020

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Var

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0019

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230

260

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440

350

540

2110

2410

2710

0 300

600

650

950

1250

282

140

250

5217

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060

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Rated max. line-

Max. operating

Rated thermal

Cantilever test

Max. operating

SF6: Min.

mm

mm

mm

current, 2s

pressure at 20°C

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igh

tnin

g im

pu

lse

with

sta

nd

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cc

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ns:

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tor

loa

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cc

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ing

to

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& I

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57

.19

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(ma

x.d

aily

me

an

s:o

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,S

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-ga

s 7

5°C

)

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ort

tim

e c

urr

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t a

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pe

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sp

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as

sta

nd

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,o

the

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ng

ths

on

re

qu

est

.N

ote

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in=

10

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or

17

0kV

typ

es

25

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co

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term

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flat

with

tw

o h

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mm

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shin

gs

Ur

> 7

2.5

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re e

qu

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an

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R = RIP InsulationT = Transformer applicationK = Short oil side partG= SF6 -gas application

Nominal current (A)

General Informations

6

Conductor loadingRated current dependent on the bushing lower length(see "Technical Data" page 5 & 6, column 12).Bushings selected with Ir not less than 120% of the ratedcurrent of the transformer are considered to be able towithstand the overload conditions according to IECPublication 60354 (Loading guide).

Recommendations for bushing installationTransformerThe field strength in the oil on the surface of the shieldinsulation must be limited to values normal for insulatedcomponents. As a guideline minimum distances A togrounded transformer parts are given below:

Bushing type

GARIP RTKG 72.5 -350 / 2000

GARIP RTKG 72.5 -350 / 2500

GARIP RTKG 123-550 / 2000

GARIP RTKG 123-550 / 2500

GARIP RTKG 145-650 / 2000

GARIP RTKG 170-750 / 2000

GARIP RTKG 170-750 / 2500

GARIP RTKG 245-1050 / 2000

GARIP RTKG 245-1050 / 2500

GARIP RTKG 362-1300 / 2000

GARIP RTKG 420-1550 / 2000

GARIP RTKG 525-1800 / 2000

Catalogue no.

HLJM 154484

HLJM 154964

HLJM 154504

HLJM 154514

HLJM 154524

HLJM 154534

HLJM 154544

HLJM 154554

HLJM 154564

HLJM 154574

HLJM 154584

HLJM 154594

TypeRTKG

123

145

170

245

362

420

525

A(mm)

130145

170200

210230

300

400

450500

550600

A

AC testvoltage (kV)

185230

275310

325365

460

570

630680

750790

Type designationThe type designation is included in an overall system. Anexample of nomenclature used to designate our GARIPbushings:

GARIP RTKG 245-1050 / 2000

Testing of the bushingEach bushing undergoes routine testing before leavingthe factory, either according to IEC 60137 or IEEEC57.19.00.

The standard tests include:

• Tan δ, capacitance and partial discharge measure-ment

• Power frequency test• Lightning impulse test (if applicable)• Leakage test

Ordering particularsWhen ordering please state:

• Type and catalogue no. see the table below• CT space L6, see "Technical Data" page 5 & 6, column

20• For 170 kV / 2000 A respective 245 kV / 2000 A only:

choose the size of oil side shield depending on thetransformer current; see "Technical Data" page 5 & 6,columns 26 &27

Lightning impulsevoltage (kV)

Rated voltage (kV)

Bushing series

GISObserve the minimum enclosurediameter DGIS as well as the minimumoperating SF6 - gas pressure (see"Technical Data" page 5 & 6, columns17 & 18). Adjacent conductor parts shouldbe well adapted to the bushing terminal.

GeneralBecause the bushing is completely dry it can beoperated vertically or horizontally or in any position.

.

Continuity over the last 75 Years

Micafil AGBadenerstrasse 780CH- 8048 ZurichSwitzerland

Phone +41 (0)58 586 03 33Fax +41 (0)58 586 04 44E-mail info@micafil.chWeb www.micafil.chG

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