EKTG_e

EKTG 72.5 – 800 kVRIP Transformer Gas Bushing

2 | 3

A technically gastight main insulating body is achieved by the method

of manufacture. No additional sealing is required. The current conductor

is un-detachably connected to the bushing core. The fi rm connection

is necessary, because the bushing is tested for gas-tightness before it

is supplied.

A system of multiple-sealing of oil- and SF6-resistant O-ring seals is

employed between the main insulating body and the bushing fl ange

and also between body and current conductor. In the fl ange area

between the seals of oil and gas side there is an annular chamber

to collect gas which may penetrate because of possible long-term

diffusion processes. This gas is released into the atmosphere almost

pressureless without entering the transformer. A liquid sealing chamber

supports the O-ring seals at the current conductor. The bushing core

is fi xed in the fl ange.

The fl ange is made of a central part and two fl ange plates, which

are screwed to the central part and sealed by O-rings. This permits

a maximum adaptability, particularly in view of the different

SF6-substation designs.

All bushings have a test tap. When the cap is screwed in position,

the last layer of the condenser grading is earthed via the contact

spring located in the cap. The built-in, insulated bushing has a

4-mm pin onto which a corresponding, resilient socket can be

plugged for test purposes. All bushings also have two M12 earthing

holes and threaded lifting holes on the pitch circle diameter of the

transformer side fl ange plate as a standard.

Standards and customized modifi cations All bushings are designed to comply with IEC Standard 60137 and

tested accordingly. The dimensions of the SF6-side of the bushings

correspond to the data of IEC 61639 and IEC 62271-211 Bushings that

comply with IEEE Standard or other national regulations are available

on request.

The types specifi ed in this brochure represent standard versions.

Modifi cations are possible but may result in price changes or different

delivery times and must therefore be specifi cally requested. The

technical designs of these bushing types are documented in compre-

hensive delivery specifi cations.

2 | 3RIP condenser bushing type EKTG

DesignIntended for the direct connection of power transformers to

SF6-switchgear, the type EKTG has an insulating body of resin

impregnated paper (RIP). The condenser core is made of special

paper epoxy resin vacuum-impregnated paper. Conductive layers

made of aluminium foil are inserted between these paper layers

for grading the electric fi eld. Thanks to their good conductivity,

optimum voltage distribution is guaranteed even in case of

rapid voltage changes.

ø d1

Test tap

ø D

1

L2 L1F

L

S2 S1

E

Type series EKTG – Dimensional drawing

Test tap

Dimensions of standard insulating electrodes

Transformer side connection with screen electrode

Recommendation transformer-fl at connecting terminal

Test tap principle:

When the test tap cap is

screwed on, the pin of the

insulating bushing is earthed.

For test purposes, plug on

a 4-mm spring socket.

SW27

O-ring 22 x 2.5

28

ø 18.5

ø 28

M24 x 1.5

ø 4

19 209

45°

Sealing surface

All dimensions in the sectional views are given in mm.

EK1 EK2 EK3 EK4

D9 mm 160 180 198 250

D10 mm 200 250 300 350

L7 mm 200 250 300 350

L8 mm 130 160 170 190

Current [A] w x h x d [mm] D [mm]

Up to 1000 ø 35 x 65 x 12 ø 11

Up to 2500 ø 45 x 85 x 16 ø 14

Up to 3150 ø 55 x 105 x 20 ø 18

ø D9

L8

L7

ø D10

D

B T

H

RIP condenser bushing type EKTG

Transformer lead with bushing type EKTG

Source: Weidmann Electrical Technology AG, Switzerland

A

C.T.

60°

Insulating electrode with bayonet from HSP

Test voltage [kV]EK1

(Ø 200 x 200) EK2

(Ø 250 x 250) EK3

(Ø 300 x 300) EK4

(Ø 350 x 350) Minimum distance

Um AC1min A [mm] A [mm] A [mm] A [mm] A [mm]

72.5 155 130 150 – – 110

100 205 150 160 – – 130

123 255 170 180 – – 160

145 305 200 210 – – 185

170 355 290 250 – – 210

245 505 420 400 330 – 330

300 505 420 400 330 – 330

362 560 – 450 375 375 340

420 695 – 675 530 510 410

550 750 – 850 650 600 500

550 870 – ■ ■ 800 550

765 970 – ■ ■ ■ 650

800 1075 – ■ ■ ■ 700

Screen electrodesBushings can be shielded with an electrode. The dimensions given

in the table refer to electrodes (EK1…EK4) made of insulating material,

that can be detached via a bayonet connection. They can be moved

upwards as well as downwards for the installation of the bushing.

The required distance to ground “A” in each case is contained in

the table above. Additional insulating measures or larger distances

may be necessary because of the constraints when installing in the

transformer. The bushing can also be operated with electrodes and

barrier systems not manufactured by HSP. The distance must not

be less than the “Minimum distance A” given in the above table.

■ Additional barriers required

Recommended installation of screen electrodesCross section EKTG

4 | 5

SF6-side connection

Round nut

Liquid sealing

Insulating body

Grading layers

Conductor bolt

Flange plate SF6-side

Central fl ange part

SF6-resistant O-ring sealing

Oil-resistant O-ring sealing

Flange plate transformer side

Test tap

Air release valve (opposite of the test tap)

Transformer vent (opposite of the test tap)

O-ring

Transformer side fl at connecting terminal (option: round connecting terminal)

Electrode

Type series EKTG – Details and dimensions

Electrical values/dimensions 6 | 7

Bushing type EKTG

Description

Technical data

Highest voltage for equipment: Um kV 72.5 72.5 72.5 72.5 123 123 123 123 145 145 145 145 170 170 170 170 245 245 245 245 300 300 300 300

Max. service voltage: line-ground kV 42 42 42 42 71 71 71 71 84 84 84 84 98 98 98 98 142 142 142 142 173 173 173 173

Rated lightning impulse withstand voltage: 1.2/50 μs

kV 325 325 325 325 550 550 550 550 650 650 650 650 750 750 750 750 1050 1050 1050 1050 1050 1050 1050 1050

Rated switching impulse withstand voltage: 250/2500 μs

kV – – – – – – – – – – – – – – – – 850 850 850 850 850 850 850 850

Rated current and maximum service current: Ir ; Imax

A 1000 1600 2000 2500 1000 1600 2000 2500 1000 1600 2000 2500 1000 1600 2000 2500 1000 1600 2000 2500 1000 1600 2000 2500

Routine Test voltage levels

Power frequency withstand voltage dry: Up 50 Hz, 1min

kV 155 155 155 155 255 255 255 255 305 305 305 305 355 355 355 355 505 505 505 505 505 505 505 505

Maximum value of partial discharge pC 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5

Partial discharge extinction voltage kV ≥ 94 ≥ 94 ≥ 94 ≥ 94 ≥ 160 ≥ 160 ≥ 160 ≥ 160 ≥ 188 ≥ 188 ≥ 188 ≥ 188 ≥ 221 ≥ 221 ≥ 221 ≥ 221 ≥ 318 ≥ 318 ≥ 318 ≥ 318 ≥ 390 ≥ 390 ≥ 390 ≥ 390

Lightning impulse test voltage (BIL): 1.2/50 μs

pos./neg.

kV – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / 1050 – / 1050 – / 1050 – / 1050 – / 1050 – / 1050 – / 1050 – / 1050

Chopped lightning impulse test voltage: time to sparkover 2…6 μs

pos./neg.

kV – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / 1155 – / 1155 – / 1155 – / 1155 – / 1155 – / 1155 – / 1155 – / 1155

Type Test voltage levels


pos./neg.

kV 325/ 325 325/ 325 325/ 325 325/ 325 550/ 605 550/ 605 550/ 605 550/ 605 650/ 715 650/ 715 650/ 715 650/ 715 750/ 825 750/ 825 750/ 825 750/ 825 1050/1155 1050/1155 1050/1155 1050/1155 1050/1155 1050/1155 1050/1155 1050/1155


pos./neg.

kV – / – – / – – / – – / – – / 666 – / 666 – / 666 – / 666 – / 787 – / 787 – / 787 – / 787 – / 908 – / 908 – / 908 – / 908 – / 1271 – / 1271 – / 1271 – / 1271 – / 1271 – / 1271 – / 1271 – / 1271

Switching impulse test voltage dry (SIL): 250/2500 μs

pos./neg.

kV – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – – / – 850/935 850/935 850/935 850/935 850/935 850/935 850/935 850/935

Dimensions

D1 mm 100 100 130 130 130 130 130 150 150 150 150 170 150 150 170 170 190 190 210 230 190 190 210 230

d1 mm 90 90 100 100 120 120 120 120 120 120 120 120 120 120 120 140 140 140 140 140 140 140 140 150

S1 mm 15 15 15 15 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20

S2 mm 25 25 25 25 30 30 30 30 30 30 30 30 30 30 30 30 35 35 35 35 35 35 35 35

F mm 200 200 200 200 205 205 205 205 205 205 205 205 205 205 205 205 210 210 210 210 210 210 210 210

d2 mm 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99 139 139 139 139 139 139 139 139

d3 mm 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 110 110 110 110 110 110 110 110

e mm 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 25 25 25 25 25 25 25 25

D3 mm 250 250 250 250 290 290 290 290 290 290 290 290 290 290 290 290 350 350 350 400 350 350 350 400

D4 mm 290 290 290 290 335 335 335 335 335 335 335 335 335 335 335 335 400 400 400 450 400 400 400 450

i1 mm 15 15 15 15 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20

z1 8 8 8 8 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12

a1 ° 45 45 45 45 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30

D5 mm 285 285 285 285 305 305 305 305 305 305 305 305 305 305 305 305 535 535 535 535 535 535 535 535

D6 mm 315 315 315 315 335 335 335 335 335 335 335 335 335 335 335 335 565 565 565 565 565 565 565 565

D7 mm 200 200 200 200 220 220 220 220 220 220 220 230* 220 220 230* 230* 450 450 450 450 450 450 450 450

D8 mm 260 260 260 260 280 280 280 280 280 280 280 280 280 280 280 280 510 510 510 510 510 510 510 510

i2 mm 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16

z2 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 16 16 16 16 16 16 16 16

a2 ° 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5

L2 mm 330 330 330 330 520 520 520 520 520 520 520 520 520 520 520 520 770 770 770 770 770 770 770 770

C.T. accommodation length E mm 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100

L1 mm 230 230 230 230 350 350 350 350 390 390 390 390 450 450 450 450 620 620 620 620 620 620 620 620

Total length L mm 860 860 860 860 1175 1175 1175 1175 1215 1215 1215 1215 1275 1275 1275 1275 1700 1700 1700 1700 1700 1700 1700 1700


Total length L mm 1060 1060 1060 1060 1375 1375 1375 1375 1415 1415 1415 1415 1475 1475 1475 1475 1900 1900 1900 1900 1900 1900 1900 1900


Total length L mm 1360 1360 1360 1360 1675 1675 1675 1675 1715 1715 1715 1715 1775 1775 1775 1775 2200 2200 2200 2200 2200 2200 2200 2200

* Dimension not according to IEC 616369/IEC 62271-211

325-73

-100

0

325-73

-160

0

325-73

-200

0

325-73

-250

0

550-12

3-10

00

550-12

3-16

00

550-12

3-20

00

550-12

3-25

00

650-14

5-10

00

650-14

5-16

00

650-14

5-20

00

650-14

5-25

00

750-17

0-10

00

750-17

0-16

00

750-17

0-20

00

750-17

0-25

00

1050

-245

-100

0

1050

-245

-160

0

1050

-245

-200

0

1050

-245

-250

0

1050

-300

-100

0

1050

-300

-160

0

1050

-300

-200

0

1050

-300

-250

0

Detailed drawings for the dimensions of the table see traps of the front and back cover.

Bushing type EKTG

Electrical values/dimensions

Description

Technical data

Highest voltage for equipment: Um kV 362 362 362 362 420 420 420 420 420 420 420 420 550 550 550 550 550 550 550 550 800

Max. service voltage: line-ground kV 210 210 210 210 242 242 242 242 242 242 242 242 318 318 318 318 318 318 318 318 462

Rated lightning impulse withstand voltage: 1.2/50 μs

kV 1175 1175 1175 1175 1425 1425 1425 1425 1550 1550 1550 1550 1675 1675 1675 1675 1800 1800 1800 1800 1950

Rated switching impulse withstand voltage: 250/2500 μs

kV 950 950 950 950 1050 1050 1050 1050 1175 1175 1175 1175 1175 1175 1175 1175 1300 1300 1300 1300 1550

Rated current and maximum service current: Ir ; Imax

A 1000 1600 2000 2500 1000 1600 2000 2500 1000 1600 2000 2500 1000 1600 2000 2500 1000 1600 2000 2500 1250

Routine Test voltage levels

Power frequency withstand voltage dry: Up 50 Hz, 1min

kV 560 560 560 560 695 695 695 695 750 750 750 750 750 750 750 750 870 870 870 870 915

Maximum value of partial discharge pC 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5

Partial discharge extinction voltage kV ≥ 470 ≥ 470 ≥ 470 ≥ 470 ≥ 546 ≥ 546 ≥ 546 ≥ 546 ≥ 546 ≥ 546 ≥ 546 ≥ 546 ≥ 714 ≥ 714 ≥ 714 ≥ 714 ≥ 714 ≥ 714 ≥ 714 ≥ 714 ≥ 841


pos./neg.

kV – /1175 – /1175 – /1175 – /1175 – /1425 – /1425 – /1425 – /1425 – /1550 – /1550 – /1550 – /1550 – /1675 – /1675 – /1675 – /1675 – /1800 – /1800 – /1800 – /1800 – /1950


pos./neg.

kV – /1293 – /1293 – /1293 – /1293 – /1568 – /1568 – /1568 – /1568 – /1705 – /1705 – /1705 – /1705 – /1843 – /1843 – /1843 – /1843 – /1980 – /1980 – /1980 – /1980 – /2145

Type Test voltage levels


pos./neg.

kV 1175/1293 1175/1293 1175/1293 1175/1293 1425/1568 1425/1568 1425/1568 1425/1568 1550/1705 1550/1705 1550/1705 1550/1705 1675/1843 1675/1843 1675/1843 1675/1843 1800/1980 1800/1980 1800/1980 1800/1980 1950/2145


pos./neg.

kV – /1422 – /1422 – /1422 – /1422 – /1724 – /1724 – /1724 – /1724 – /1876 – /1876 – /1876 – /1876 – /2027 – /2027 – /2027 – /2027 – /2178 – /2178 – /2178 – /2178 – /2360

Switching impulse test voltage dry (SIL): 250/2500 μs

pos./neg.

kV 950/1045 950/1045 950/1045 950/1045 1050/1155 1050/1155 1050/1155 1050/1155 1175/1293 1175/1293 1175/1293 1175/1293 1175/1293 1175/1293 1175/1293 1175/1293 1300/1430 1300/1430 1300/1430 1300/1430 1550/1705

Dimensions

D1 mm 210 230 285 285 285 285 285 355 285 285 285 355 355 355 355 355 355 355 355 355 450

d1 mm 140 150 150 150 150 150 150 170 150 150 150 170 170 170 170 170 170 170 170 170 200

S1 mm 20 20 25 25 25 25 25 30 25 25 25 30 30 30 30 30 30 30 30 30 40

S2 mm 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 40

F mm 210 210 245 245 245 245 245 250 245 245 245 250 250 250 250 250 250 250 250 250 250

d2 mm 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 139 200

d3 mm 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 110 170

e mm 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25

D3 mm 350 400 450 450 450 450 450 550 450 450 450 550 550 550 550 550 550 550 550 550 620

D4 mm 400 450 500 500 500 500 500 600 500 500 500 600 600 600 600 600 600 600 600 600 700

i1 mm 20 20 20 20 20 20 20 25 20 20 20 25 25 25 25 25 25 25 25 25 25

z1 12 12 12 12 12 12 12 16 12 12 12 16 16 16 16 16 16 16 16 16 16

a1 ° 30 30 30 30 30 30 30 22.5 30 30 30 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5

D5 mm 640 640 640 640 640 640 640 640 640 640 640 640 640 640 640 640 640 640 640 640 650

D6 mm 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690 690 700

D7 mm 540 540 540 540 540 540 540 540 540 540 540 540 540 540 540 540 540 540 540 540 550

D8 mm 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 610

i2 mm 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 25

z2 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16

a2 ° 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5 22.5

L2 mm 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050 1050

C.T. accommodation length E mm 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 –

L1 mm 690 690 690 690 790 790 790 790 840 840 840 840 990 990 990 990 990 990 990 990 1100

Total length L mm 2050 2050 2085 2085 2185 2185 2185 2190 2235 2235 2235 2240 2390 2390 2390 2390 2390 2390 2390 2390 –

C.T. accommodation length E mm 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 300 –

Total length L mm 2250 2250 2285 2285 2385 2385 2385 2390 2435 2435 2435 2440 2590 2590 2590 2590 2590 2590 2590 2590 –

C.T. accommodation length E mm 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600 600

Total length L mm 2550 2550 2585 2585 2685 2685 2685 2690 2735 2735 2735 2740 2890 2890 2890 2890 2890 2890 2890 2890 3000

* Dimension not according to IEC 616369/IEC 62271-211

1175

-362

-100

0

1175

-362

-160

0

1175

-362

-200

0

1175

-362

-250

0

1425

-420

-100

0

1425

-420

-160

0

1425

-420

-200

0

1425

-420

-250

0

1550

-420

-100

0

1550

-420

-160

0

1550

-420

-200

0

1550

-420

-250

0

1675

-550

-100

0

1675

-550

-160

0

1675

-550

-200

0

1675

-550

-250

0

1800

-550

-100

0

1800

-550

-160

0

1800

-550

-200

0

1800

-550

-250

0

1950

-800

-125

0

8 | 9

Detailed drawings for the dimensions of the table see traps of the front and back cover.

References 10 | 11

800 kV bushing on a single-phase

transformer in China

420 kV bushing on a step-up transformer

for a power plant in Germany

420 kV outdoor bushing at a GIS substation

in Germany

HSP bushings throughout the worldThe proverbial quality and reliability of HSP products has led

to our condenser bushings being used in the leading energy

projects worldwide.

The HSP product range:We cover all requirements of modern high-voltage technology

up to the ultra-high operating voltages with our products and

services. Our product portfolio is enhanced with tailored services

for our own products as well as those from other manufacturers.

1 Transformer bushings2 Switchgear bushings3 Generator bushings4 HVDC bushings

In addition to standardized products, we also offer individual

special products for our customers that we manufacture with

state-of-the-art production processes. These are usually developed

by us in-house and tested in our fully equipped, internationally

accredited test bay.

250 kV direct current bushing on a converter transformer

in China

1 42 3

www.hspkoeln.de

Pub. EKTG 72.5 – 800 kV03/12-1500 TH 102-110888All rights reserved.Brands and trademarks used in this documentare the property of HSP Hochspannungsgeräte GmbH.

Subject to change without prior notice.The information in this document contains generaldescriptions of the technical options which are notnecessarily available in every single case. The requiredfeatures must therefore be defined in each individualcase when concluding the contract.

Printed in Germany on elementary chlorine free paper.

Connection transformer side

ø i1

90°

S14

Connection SF6-side

ø d2

4 x M12

ø d3

30

e

Z2 x α2α2

ø i2

ø D6

ø D5

ø D

8

ø D

7

Z1 x α1α1

ø D3

ø i1

ø D4

Published and copyright © 2012:

HSP Hochspannungsgeräte GmbHCamp-Spich-Str. 1853842 Troisdorf-SpichGermany

Phone: +49 (0) 22 41/25 26-0Fax: +49 (0) 22 41/25 26-116

E-mail: [email protected]

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EKTG_e