cable current transformers types: kolma,...

CABLE CURRENT TRANSFORMERStypes: KOLMA, KOLA, KOKM, KOKU, KOLT

Catalogue

2 ABB

CONTENT page

1. KOLMA, KOLADescription ........................................................................... 3How to select the correct residual current transformers ..... 3Technical data ...................................................................... 4Installation ............................................................................ 4Ordering data ....................................................................... 6Overall dimensions ............................................................... 6

2. KOKM ...................................................................................... 9Technical data ...................................................................... 9Ordering data ..................................................................... 10Instruction for installation .................................................. 10Overall dimensions ............................................................. 12

3. KOKU..................................................................................... 17Technical data .................................................................... 17Overall dimensions ............................................................. 19

4. KOKM (for ZX panells) ......................................................... 22Technical data .................................................................... 22Overall dimensions ............................................................. 23

5. KOLT ...................................................................................... 31Dimensional drawing .......................................................... 31Technical data .................................................................... 32

3ABB

Cable Current Transformers, indoortypes: KOLMA, KOLA

DescriptionTransformers, KOLMA_ and KOLA_ are suitable for the measurement of the sumof three-phase currents in a 3-phase cable. Under normal operating conditionsthis sum is zero. In the event of an earth-fault the sum of the currents is equal tothe earth-faul current and a corresponding current flows in the secondary.

These transformers are used together with static earth-fault relays. The cablecurrent transformers can generally be used when measuring the residual currente.g. to prewarn of, or locate an earth-fault. An uninsulated busbar or low voltagecable serves as the primary conductor.

How to select the correct residual current transformersThe transformer for an earth-fault relay is selected according to dimension of thewindow, and construction of the transformer.

For types KOLMA 06 A1, and KOLMA 06 D1, the number of turns used in thesecondary winding is selected according to the relay setting value, and the earth-fault current or the required current ratio.

In addition correct functioning of the earthfault protection relays for KOLMA06 A1 and KOLMA 06 D1 is easy to test by means of the test winding (termi-nals P1x - P2x) of the transformer. The test winding is rated for 6 A max.continuous current.

4 ABB

Type Window diam. Construction Weightmm kg

KOLMA 06 A1 90 Ring core, multi-tap secondary 7.0KOLMA 06 A2 58 Ring core 2.9

KOLMA 06 B2 100 Ring core 5.4

KOLMA 06 D1 180 Ring core, multi-tap secondary 11.5KOLMA 06 D2 180 Ring core 11.4

KOLA 06 B2 100 Split ring core 6.0KOLA 06 D2 180 Split ring core 11.0

Technical dataThe primary winding of indoor type cable current transformers is either a cable ora busbar, which is insulated for the application voltage.

The secondary winding and ring shaped iron core is cast in resin which has goodelectrical and mechanical properties.

Rated voltage 0.72 kV (1)

Insulation test voltage50 Hz 1 min 3 kV (IEC 60044-1)

Frequency 50 Hz (60 Hz)

Rated thermal current 1.2 x Ipn

Short-time withstand current Ith 1 s 60 x Ipn (2)

Peak withstnad current Idyn 2.5 x IthSecondary terminals For 6 mm2 conductorOperating temperature range –5...+40 °C

(1) The insulation level of the primary conductor determines themaximum operating voltage.

(2) KOLA 06 B2 is type tested for 10 kA 3 s.

Cable current transformers, types KOLMA_

InstallationThe KOLMA-types must be installed before the cables and cable terminationsare connected.

With the KOLA 06 B2 and KOLA 06 D2 -types, the ring core can be opened andthus the transformer can be installed eventhough the cable is already connected.The two halves of the ring core are tightened together with four screws whichalso guide the halves to the correct position. The secondary winding is distrib-uted over both halves of the core. The two sections of the winding are connectedtogether with two connecting pieces.

Cable current transformers are fastened either by means of the fixing base or bythe nuts cast into the transformer frame. When installing the transformer, theeffect of the current in the metal armour or in the protective conductor must beeliminated. In case the metal armour or the protective conductor is drawn throughthe transformer, the earthing conductor must be drawn back through the trans-former for earthing. The earthing conductor between the cable termination boxand the transformer, must not be connected to conductive structures, and themetal cable termination box must be insulated from the supporting structures.

On a multi-ratio transformer the unconnected secondary winding terminals andtest winding must not be short circuited.

Table 1 Selection of residual current transformers

5ABB

Table 3. Current ratios and rated burdensfor accuracy class 10 P 10

Design data.Types KOLMA 06 A2, KOLMA 06 B2, KOLMA 06 D2 and KOLA 06 B2

Type Current ratio Secondary terminals BurdenA VA

KOLMA 06 A2 100/1 S1 - S2 2.0KOLMA 06 B2 100/1 S1 - S2 2.5KOLMA 06 D2 100/1 S1 - S2 2.0KOLA 06 B2 100/1 S1 - S2 2.0KOLA 06 D2 100/1 S1 - S2 2.0

Table 2. Current ratios and rated burdensfor accuracy class 10 P 10

Design data.Types KOLMA 06 A1 and KOLMA 06 D1

Current Secondary Burden / VAratio terminals Type

A KOLMA 06 A1 KOLMA 06 D1

50/1 S4 - S5 1.0 0.570/1 S3 - S4 2.0 1.0100/1 S1 - S4 2.5 2.0

150/1 S1 - S5 5.0 4.050/5 S1 - S2 1.0 0.5100/5 S2 - S3 2.5 1.5

150/5 S1 - S3 4.0 3.0250/5 S4 - S5 7.5 5.0350/5 S3 - S4 10.0 7.5

500/5 S1 - S4 15 10600/5 S3 - S5 20 15750/5 S1 - S5 20 15

S1 S2

100

P1 P2

S1 S2 S3 S4 S5 P1x P2x

50 20702010

P1 P2

CableTest winding

Cable

Number of turns and terminal markings

KOLMA 06 A1KOLMA 06 D1

KOLMA 06 A2KOLMA 06 B2KOLMA 06 D2KOLA 06 B2KOLA 06 D2

Openable residual current transformers, type KOLA 06B2 complete with fixing base KOLMA-ZK 1 andterminal cover KOK-ZAX 14.

6 ABB

KOLMA 06 A1 KOLMA 06 A2, B2

Type Dims./mmKOLMA A B C D06 A2 58 177 196 14006 B2 100 229 249 196

Table 4. Selection of accessories for KOLMA_ and KOLA_

Ordering data for accessories– quantity– type

Accessores shall be ordered separately.

Overall dimensions

P1

90

14

245

113

238

186

9618

KOLMA-ZK1

52M 8

3978

KOLMA-ZL 2,3

M5

14M8

52

A B

KOK-ZAX 14

12,5

C

18KOLMA-ZK165

175145

78D

Description of accessory Type Suitable for usetogether

with transformer

Fixing base KOLMA-ZK 1 KOLMA 06 A1Fixing base KOLMA-ZK 1 KOLMA 06 A2Fixing base KOLMA-ZK 1 KOLMA 06 B2Fixing base KOLMA-ZK 1 KOLA 06 B2Fixing base KOLMA-ZK 2 KOLMA 06 D1Fixing base KOLMA-ZK 2 KOLMA 06 D2Fixing base KOLMA-ZK 2 KOLA 06 D2

Secondary terminal cover KOK-ZAX 14 KOLMA 06 A2Secondary terminal cover KOK-ZAX 14 KOLMA 06 B2Secondary terminal cover KOK-ZAX 14 KOLA 06 B2Secondary terminal cover KOK-ZAX 14 KOLA 06 D2

7ABB

KOLMA 06 D1, D2

1518

17

2325

80KOLMA-ZL2,3

KOLMA-ZK2

270190150130 145

115

140

335180

P1

KOK-ZAX 14M5

M5 P1

7

52

100

KOLMA-ZK1

109

110

219 238

18

M8

14

85

228

2036

P1

a b

ba

1 2

KOK-ZAX 147

180

KOLMA-ZK 2

M5

M5

153

293

16

140

315

3

M1018150

13011

20

31536

20 85 115 145

KOLA 06 B2 KOLA 06 D2

8 ABB

Table 5 KOLA 06 J2Standards parameters for KOLA 06 J2 f = 50 Hz

Type Window diameter Ratio Accuracy Burden[mm] [A] Class [VA]

KOLA 06 J2 300x497 100/1 10P10 1KOLA 06 J2 300x497 200/5 10P10 2KOLA 06 J2 300x497 300/1 10P10 5

Note: If you need other electrical parameters than given in tables please contact with our salesdepartment.

S1

P1 P2

S2

P1

P2

a1 a2 b2 b1

90

113M6

497 0+3

570

610

R40

R14

20

30

0

37

0

4 10

20

46

2

75

40

16

17

6

a1ø15

a2

b2 b1

a2 a1

62

22

,5ø

S1

S2

M5619

KOLA 06 J2_

9ABB

Cable Current Transformerstypes: KOKM (indoor type)

Technical dataTransformer type KOKM 06 KOKM 1

Rated voltage Um [ kV ] 0.72 (1) 1.2 (1)

Power frequency test voltage Up 1min [ kV ] 3 6Lighting test voltage Upp [ kV ] - -Frequency fn [ Hz ] 50 and 60Max. primary current Ipn [ A ] 2 000 10 000Rated secondary current Isn [ A ] 1 and 5Rated thermal current Icont [ A ] 1,2 x Ipn

(2)

Short-time withstand current Ith 1s [ kA ] 60 x Ipn (3)

Peak withstand current Idyn [ kA ] 2,5 x Ith (4)

Secondary terminals For 6 mm2 conductorOperating temperature range [ °C ] - 5 … + 40Transport and storage [ °C ] - 25 … + 55Electrical standards IEC, VDE, ANSI, BS, AS, CAN

(1) The insulation level of the primary conductor determines the maximum operating voltage.(2) Max. Icont for KOKM 06 Icont = 2 400 A, for KOKU 072 G4 Icont = 1 000 A, for KOKM Icont= 10 000 A(3) Max. Ith = 90 kA,(4) Max. Idyn = 225 kA

Current transformer series KOKMfor measuring of phase currentsKOKM current transformers are suitable for measuring of phase currents in low voltageswitchgear. An uninsulated busbar or low voltage cable serves as the primary conduc-tor. Series KOKM current transformers can also be used for measuring the phasecurrent at voltages even higher than 0,72 kV (for KOKM 06) or 1,2 kV (for KOKM 1), if theinsulation of the high voltage primary conductor fulfils the respective standards for theoperating voltage. The secondary winding and ring shaped iron core is cast in resinwhich has good electrical and mechanical properties.

10 ABB

Instructions for installationMounting of the cable current transformers

The cable current transformer may be installed either in vertical or in horizontal posi-tion. It can be mounted either by using bottom inserts or by using a separate fixingbase, which in turns is fixed to the bottom inserts. When using the bottom inserts formounting, the screws (M8) shall not be tightened in excess of the nominal torque; 9Nm, for the screws (M6) 3.3 Nm, otherwise damage may occur. Use a torque span-ner if necessary. The current transformer can be fastened to the cable which acts asprimary conductor by means of a special fixing piece. In such cases it must beinsured that the cable endures the strain caused by the weight of the transformer,especially in circumstances where vibration is involved. The secondary terminalscrews, size M5, must not be tightened in excess of 2.5 Nm (M4 1.0 Nm).

Fastening of the primary cable

The cable acting as primary winding shall be entered through the opening in thecable current transformer. This must be done before the cable box belonging to thecable inserted through the primary opening is installed. If the cable box can beentered through the primary opening even when it is installed on the cable, theinstallation of the cable box can also be done before. With the KOLA 06 J2, thecable current transformer can be opened and thus the transformer can be in-stalled even though the cable is already connected. The two halves of the ring coreare tightened together with four screws which also guide the halves to the correctposition. The secondary winding is distributed over both halves of the core. Thetwo section of the winding are connected together with two connecting pieces.

Note:

The secondary terminals of the current transformer should never be left open-circuited, because in that case hazardous high voltages will be induced betweenthe secondary terminals.

Instructions for maintenance

Cable current transformers do not need to be maintained. However, excessive dust orother kind of dirt can be brushed off the transformer. Dirty transformers can be cleanedwith water, spirit, petrol or toluene. Traces of arcs and minor surface damages can beeasily removed with sandpaper after which the surface is to be treated with siliconepaste. Epoxy resin surfaces of the current transformer have also a high resistance tochemicals.

Ordering dataEnquires for these transformers should mention the following data:

1.Quantity,2.Type, (example: KOKM 1 DC 10 (1), KOKU 1 KL 12 (2), KOKM 06 J29 (3),

KOKU 072 G4 (4))3.Current ratio Ipn/Isn (A),4.Burden (VA),5.Accuracy class,6.Electrical standards,7. Window dimension (mm),8.Other limiting data such as instrument security, dimensions of transformer,

fixing of transformer (fixing base) etc.,9.Indoor or outdoor use.(1) Other name of Type for KOKM 1 you can choose from table 6.(2) Other name of Type for KOKU 1 you can choose from table 8.(3) Other name of Type for KOKM 06 you can choose from table 7.(4) Electrical parameters and window dimension for KOKU 072 G4 include table 9.

Terminal markings

P2S2S1

P1 P11S1 1S2

P22S22S1

P1S2S1

P2S3

one secondary windingexample: 100/1 [A/A]

multi-tap secondary windingexample: 50-100/1 [A/A]

two secondary windingsexample: 800/5/5 [A/A/A]

KOKM 06 J

KOKM 1 FC6

11ABB

The transformers can be used in areas, where the atmosphere includes corrosivegases such as sulphuric and nitrogenous compounds provided that secondary termi-nals and fixing base of the transformers have been ordered to meet the demands ofthe operating atmosphere. Instructions for repairing greater surface damages (suchas cracks) must be requested from the manufacturer.

Storage instructions

For current transformers, the allowed storage temperature is - 40°C …+ 55°C.The transformers shall be protected against direct sun light.

Package, Transport and Storage

Transformers assigned for export are packed in wooden cases lined with the asphaltbuilding paper. During the transport of transformers one should pay attention toproper position of wooden cases in accordance with inscription and marks given onthem and their protection against the influence of weather conditions. Transformershould be stored in dry and clean accommodations, protecting direct influence ofprecipitation and frost.

Warranty

The factory grants 24 months of warranty from the day of put to use of the trans-former, but no longer than 36 months from the day of sell. The warranty concernsonly manufacturing defects and does not include defects arose because of:

– improper transport,– improper storage,– not abiding of the instruction before installing and during operating

of the transformers,– improper selection of the transformer for the electric power system.

Procedure regarding the products after the end of their use.

The manufacturer gets back or indicates the store place for instrument transformersof its own production, which the period of use is finished, in order to their recycling.

Table 6. KOKM 1example KOKM 1 DC 10

Transformers width 10 = 100 mm (possibility 6, 8, 10, 12, 14, 16, 18, 20, 22, 24)Outer diameter C = 148 mmHole diameter D = 60 mmRate voltage 1 = 1.2 kV (06 and 072 = 0.72 kV)Type KOKM – indoor use, (KOKU – outdoor use)

Outerdiameter

(mm)A B D E F G H K N R U W X Y Z

C

F

H

K

L

M

P

T

W

KOKM 1 _C _

KOKM 1 _F _

KOKM 1 _H _

KOKM 1 _K _

KOKM 1 _L _

KOKM 1 _M _

KOKM 1 _P _

KOKM 1 _T _

KOKM 1 _W _

112

131

138

158

158

158

204

225

300

236

266

288

328

350

350

432

500

653

183

213

235

275

297

297

379

465

605

60160601608018080

20080

20080

240

60160601608018080

20080

20080

24080

200

60160601608018080

20080

2008024080

200

148

33 42 60 70 85 90 100 120 155 180 250 360 400 450 500

186

200

250

270

280

340

450

590

60160601608018080

20080

2008024080

200

60160601608018080

20080

2008024080

20080

200

601608018080

20080

2008024080

20080

20080

200

601608018080

20080

2008024080

20080

20080

200

8018080

20080

2008024080

20080

20080

200

8020080

20080

24080

20080

20080

200

8020080

24080

20080

20080

200

8020080

20080

200

8020080

20080

20080

20080

200

Hole diameter (mm)

DrawingC

astin

g he

ight

(mm

)

Tota

l hei

ght

(mm

)

Hol

e ce

nter

heig

ht (m

m)

Range of transformers width

KOKM 1 RL 8

12 ABB

±2

S1 S2

P2P1

+20±2

±3±2

±2

6

40

KOKM 1 _ C __

M8

M5

P1

Di = 33 42 60 70 85A B D E F

6 8 10 12 14 16B = 60 80 100 120 140 160C = 80 100 120

1) KOKM 1_C6 without the coverNote:

M61

1617

75

23

112

148

Di

14

183

18

236

113

1140

52124

C20

B

(12

0...1

60)

B

(60

...10

0)

±2

±2

P1

S1 S2

P2

P1

+30

M5

P1

M61

75

40

6

23

16

17

131

170

14

18

186

Di

213

±2

266

±3

113

140

52

1140

B

(60.

..80)

C

B

(100

0...1

60)

±2

20

KOKM 1 _ F __Di = 33 42 60 70 85 90 100

A B D E F G H

6 8 10 12 14 16

B = 60 80 100 120 140 160C = 60 80 100 120

M8

1) KOKM 1_F6 without the coverNote:

150

246

1440

20CB

±2

P1

S1

P1 P2

S2M8

M6

M5

Di = 33 42 60 70 85 90 100 120A B D E F G H K

8 10 12 14 16 18

B = 80 100 120 140 160 180C = 60 80 100 120 140

±2

+30

16

75

17

6

40

138200

170

14

18

Di

235±

2

288

±3

113

52

140

1140

B

(80)

±2

C

B

(100

...18

0)±2

KOKM 1 _ H _

P1

P1

S1

P2

S2

M5M6

M8

Di = 33 42 60 70 85 90 100 120 155A B D E F G H K N

8 10 12 14 16 18 20B = 80 100 120 140 160 180 200C = 40 60 80 100 120 140 160

±2

0-2

+30

16

75

640

17

23

158

270

Di

250

15

1827

5±2

328±

3

113

KOKM 1 _ K _

Overal dimensions

KOKM 1_C_ KOKM 1_F_

KOKM 1_H_ KOKM 1_K_

13ABB

P1

P1

S1

P2

S215

8

M5M6

M8

Di = 33 42 60 70 85 90 100 120 155 180 200A B D E F G H K N R S

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 40 60 80 100 120 140 160

±2

+30

0-2

74

16

17

23

40

6270

270

Di

15

1829

7±235

0±3

113

150

246

20CB

±2

1440

KOKM 1 _ L _

S1

P2

S2

P1

P1

M5M6

M8

Di = 33 42 60 70 85 90 100 120 155 180A B D E F G H K N R

8 10 12 14 16 18 20 22 24

B = 80 100 120 140 160 180 200 220 240C = 40 60 80 100 120 140 160 180 200

±2

0-2

+30

16

75

23

17

6

40

158

280

270

15

1829

7±2

350

±3

Di

113

150

246

1440

20CB

±2

KOKM 1 _ M _

0-3

M8

450

15CB

±1

P1

P1

S1 S2

P2

M6 M5

M8

Di = 42 60 70 85 90 100 120 155 180 250B D E F G H K N R U

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 40 60 80 100 120 140 160

±2

+30

0-2

16

75

23

17

6

40

204

270

340

15

1837

9±2

432±

3

Di

113

20CB

±2

1440

KOKM 1 _ P _

P1

P1

S1

P2

S2

M6M5

Di = 85 90 100 120 155 180 250 350F G H K N R U W

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 50 70 90 110 130 150 170

+40

Note:Without fixing base. Fix directly to floor

75

1617 23

40

6

180

225

Di

15

225

±3

465

±3500

113

KOKM 1 _ T _

KOKM 1_L_ KOKM 1_M_

KOKM 1_P_ KOKM 1_T_

14 ABB

Table 7. KOKM 06

Standards parameters for KOKM 06 J_ (window type) f = 50 Hz

Type Window diameter Ratio Accuracy Burden[mm] [A] Class [VA]

KOKM 06 J2KOKM 06 J2KOKM 06 J2KOKM 06 J2KOKM 06 J2KOKM 06 J2KOKM 06 J2KOKM 06 J2KOKM 06 J2KOKM 06 J21KOKM 06 J21KOKM 06 J21KOKM 06 J21KOKM 06 J21KOKM 06 J21KOKM 06 J22KOKM 06 J22KOKM 06 J22KOKM 06 J23KOKM 06 J23KOKM 06 J23KOKM 06 J23KOKM 06 J23KOKM 06 J24KOKM 06 J24KOKM 06 J29KOKM 06 J29KOKM 06 J29KOKM 06 J29KOKM 06 J29

300x500300x500300x500300x500300x500300x500300x500300x500300x500500x150500x150500x150500x150500x150500x150300x200300x200300x200600x200600x200600x200600x200600x200300x250300x250450x650450x650450x650450x650450x650

50/5100/1100/5100/5250/5400/5500/1500/5

2000/530/150/1100/1100/5150/1500/5100/1300/11000/5

50/160/1100/1200/1300/550/1150/150/150/5100/1100/5400/1

10P1010P1010P10

310P1010P105P2010P10

0.510P1010P1010P1010P1010P1010P1010P105P105P1010P1010P1010P1010P105P1010P1010P1010P1010P1010P1010P105P10

0.52

1.5215105150.5111110215151132212111110

P1

±3

±3±3

M5 M5IP23

Di = 90 100 120 155 180 250 350 400 450 500G H K N R U W X Y Z

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 30 50 70 90 110 130 150

Witout fixing base. Fix directly to floor.Note:

64

200

250

15

605

0+ 4

Di

300

17

48

97

142

Pk 16Pr 22,5Pg 16

M12

B

25C

0-3590

P1 P2

S1 S2KOKM _1 _W

KOKM 1_W_

15ABB

500 0+3

573

613

R40

R14

20

300

3704 10

20

462

80

113

M5M6

�15

75

40

23

16

17

6

S1P1 P2

S2

S2S1P1 P2

M5M6113

80R14

R40

150

220

260

20

500+3 0

573

613

665

�15

20

75

40

23

16

17

6

S1P1 P2

S2

80

113

M5M6

�15

200

270

310

R40

R14

20

300

370

410

20

462

75

40

23

16

17

6

KOKM 06 J2 KOKM 06 J21_

KOKM 06 J22

S1P1 P2

S2

M5M6

80

200

270

310

R14

R40

600

0+3

673

713

20

20

765

113

�15

75

40

23

16

17

6

KOKM 06 J23

16 ABB

KOKM 06 J24 KOKM 06 J29_

S1P1 P2

S2

80

113

M5M6

�15

250

320

360

R40

R14

20

300

370

410

20

462

75

40

23

16

17

6

S1P1 P2

S2

80

113

M5M6

�15

650

720

760

R40

R14

20

450

520

560

20

612

0+3

17

16

23

40

6

75

17ABB

Cable Current Transformerstype KOKU (outdoor type)

Technical dataTransformer type KOKU 072 G4 KOKU 1

Rated voltage Um [ kV ] 0.72 (1) 1.2 (1)

Power frequency test voltage Up 1min [ kV ] 3 6Lighting test voltage Upp [ kV ] - -Frequency fn [ Hz ] 50 and 60Max. primary current Ipn [ A ] 800 10 000Rated secondary current Isn [ A ] 1 and 5Rated thermal current Icont [ A ] 1,2 x Ipn

(2)

Short-time withstand current Ith 1s [ kA ] 60 x Ipn (3)

Peak withstand current Idyn [ kA ] 2,5 x Ith (4)

Secondary terminals For 6 mm2 conductorOperating temperature range [ °C ] - 5 … + 40Transport and storage [ °C ] - 25 … + 55Electrical standards IEC, VDE, ANSI, BS, AS, CAN

(1) The insulation level of the primary conductor determines the maximum operating voltage.(2) Max. Icont for KOKM 06 Icont = 2 400 A, for KOKU 072 G4 Icont = 1 000 A, for KOKU 1 Icont= 10 000 A(3) Max. Ith = 90 kA,(4) Max. Idyn = 225 kA

Current transformer series KOKUfor measuring of phase currentsKOKU current transformers are suitable for measuring of phase currents in low volt-age switchgear. An uninsulated busbar or low voltage cable serves as the primaryconductor. Series KOKU current transformers can also be used for measuring thephase current at voltages even higher than 0,72 kV (for KOKU 072 G4) or 1,2 kV(for KOKU 1), if the insulation of the high voltage primary conductor fulfils the respec-tive standards for the operating voltage. The secondary winding and ring shaped ironcore is cast in resin which has good electrical and mechanical properties.

18 ABB

example KOKU 1 KL 12

Transformers width 12 = 120mm (possibility 8, 10, 12, 14, 16, 18, 20, 22, 24)Outer diameter L = 270mmHole diameter K = 120mmRate voltage 1 = 1.2kV (06 and 072 = 0.72 kV)Type KOKU – outdoor use, (KOKM – indoor use)

Outerdiameter

(mm)A B D E F G H K N R U W X Y Z

C

F

H

K

L

M

P

T

W

80160801608018080

20080

20080

240

80160801608018080

20080

20080

24080

200

80160801608018080

20080

20080

24080

200

148

33 42 60 70 85 90 100 120 155 180 250 360 400 450 500

186

200

250

270

280

340

450

590

80160801608018080

20080

2008024080

200

80160801608018080

20080

2008024080

20080

200

801608018080

20080

2008024080

20080

20080

200

801608018080

20080

2008024080

20080

20080

200

8018080

20080

2008024080

20080

20080

200

8020080

2008024080

20080

20080

200

8020080

24080

20080

20080

200

8020080

20080

200

8020080

20080

20080

20080

200

Hole diameter (mm)

Drawing

Cas

ting

heig

ht(m

m)

Tota

l hei

ght

(mm

)

Hol

e ce

nter

heig

ht (m

m)

KOKU 1 _C _

KOKU 1 _F _

KOKU 1 _H _

KOKU 1 _K _

KOKU 1 _L _

KOKU 1 _M _

KOKU 1 _P _

KOKU 1 _T _

KOKU 1 _W _

183

213

235

275

297

297

379

465

605

249

279

301

341

363

363

445

513

653

112

131

138

158

158

158

204

225

300

Range of transformers width

Table 8. KOKU 1

Table 9.Standards parameters for KOKU 72 G4

Type Window Total Hole Ratio Accuracy Burden Short Standarddiameter height center Class circuit

height currentIth, 3s

[mm] [mm] [mm] [A] [VA] [kA]

KOKU 072 G4 ∅ 135 230 125 600/1 5P10 3 25 IEC 60044-1Note: If you need other electrical parameters than given in tables please contact with our sales department.

19ABB

±2

140

52

1140

B

(80)

CB(1

000.

..160

)±2

±2±2

20

1152707518

78

B

(60.

..140

)

80

B

(16

0)

±2

S1 S2

P2P1

+20

±2

±3±2

±2

IP44

16

17

M5 M5

Pr 22,5Pk 16

Pg 16

97142

249

KOKU 1 _ C __

M8

P1

Di = 33 42 60 70 85A B D E F

8 10 12 14 16B = 80 100 120 140 160C = 80 100 120

112

148

Di

14

183

18

1140

52124

C20

B

(12

0...1

60)

B

(80

...10

0)

864

150

1440

20CB

±2

52

1140

B

(80)

±2

C

B

(100

...18

0)±2

±2

P1

S1 S2

P2

P1

+30

P1

131

170

14

18

186

Di

213

±2

±3

864

17

16

97142

279

IP44

M5

Pk 16Pr 22,5PG 16

M5

KOKU 1 _ F __Di = 33 42 60 70 85 90 100

A B D E F G H

8 10 12 14 16

B = 80 100 120 140 160C = 80 100 120

M8

P1

S1

P1 P2

S2M8

Di = 33 42 60 70 85 90 100 120A B D E F G H K

8 10 12 14 16 18

B = 80 100 120 140 160 180C = 60 80 100 120 140

±2

+30

138200

170

14

18

Di

235±

2

301

±3

140

IP44

16

64 8

17

M5M5

Pg 16

Pk 16Pr 22,5

97142

KOKU 1 _ H _

P1

P1

S1

P2

S2M8

Di = 33 42 60 70 85 90 100 120 155A B D E F G H K N

8 10 12 14 16 18 20B = 80 100 120 140 160 180 200C = 40 60 80 100 120 140 160

±2

0-2

+30

158

270

Di

250

15

1827

5±2

341

±3

246

IP44

16

64 817

M6

Pk 16Pr 22,5Pg 16

M597142

KOKU 1 _ K _

KOKU 1_C_ KOKU 1_F_

KOKU 1_H_ KOKU 1_K_

Overal dimensions

20 ABB

150

1440

20CB

±2

150

20CB

±2

1440

P1

P1

S1

P2

S2

Di = 85 90 100 120 155 180 250 350F G H K N R U W

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 50 70 90 110 130 150 170

0-3

M8

+40

Note:Without fixing base. Fix directly to floor

180

225

Di

15

225

±3

465

±3513

450

15CB

±1

IP44

17

1664 8

M5M5

Pk 16Pr 22,5Pg 16

97142

KOKU 1 _ T _

P1

P1

S1 S2

P2

M8

Di = 42 60 70 85 90 100 120 155 180 250B D E F G H K N R U

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 40 60 80 100 120 140 160

±2

+30

0-2

204

270

340

15

1837

9±244

5±3

Di

20CB

±2

1440

.IP44

16

64 8

17

M5 M5

Pr 22,5Pg 16

Pk 16

97

142

KOKU 1 _ P _

Di = 33 42 60 70 85 90 100 120 155 180

B = 80 100 120 140 160 180 200 220 240C = 40 60 80 100 120 140 160 180 200

S1

P2

S2

P1

P1

M8

A B D E F G H K N R

8 10 12 14 16 18 20 22 24

±2

0-2

+30

158

280

270

15

1829

7±236

3±3

Di

246

IP4416

64 8

17

M5

Pg 16

Pk 16Pr 22,5

M597142

KOKU 1 _ M _

P1

P1

S1

P2

S215

8

M8

Di = 33 42 60 70 85 90 100 120 155 180 200A B D E F G H K N R S

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 40 60 80 100 120 140 160

±2

+30

0-2270

270

Di

15

1829

7±236

3±3

246

IP44

17

16

64 8

Pk 16Pr 22,5Pg 16

M5M6 97142

KOKU 1 _ L _

KOKU 1_L_ KOKU 1_M_

KOKU 1_P_ KOKU 1_T_

21ABB

±3

M12B

25C

0-3590

P1

±3

±3

M5 M5IP23

Di = 90 100 120 155 180 250 350 400 450 500G H K N R U W X Y Z

8 10 12 14 16 18 20

B = 80 100 120 140 160 180 200C = 30 50 70 90 110 130 150

Witout fixing base. Fix directly to floor.Note:

64

200

250

15

605

0+ 4

Di

300

17

48

97

142

Pk 16Pr 22,5Pg 16

P1 P2

S1 S2KOKU _1 _W

S2S1

P2

S1 S2

Cable, length 1,6 m

Rating plate

M5 M5

M12X60

�135

125

150

210

45

111

230

�13

,3

1

S2 = 2

2

S1 = 1

KOKU 1_W_ KOKU 072 G4

22 ABB

KOKM 1 EB – is the indoor, cable, low voltage current transformer in resininsulation.Transformers of KOKM type are suitable for measurement of phasecurrents in low voltage switchgears. As the primary conductor is used the non-insulated busbar or the low voltage cable. Current transformers of KOKM seriescan be also used for measurement of the phase current at voltages even higherthen 1,2 kV, if the insulation of the high voltage primary conductor fulfils theequirements of elevant standards relating to the working voltage.

Technical data:

Type ................................................................................................... KOKM 1EBMaximum number of windings .......................................................................... 1Level of insulation ....................................................................................... 1/6/-Highest permissible voltage of the current transformer Ur ........................ 1,2 kVRating test voltage of insulation (50 Hz, 1 min Up) ....................................... 6 kVRating frequency ....................................................................................... 50 HzRating thermal current ............................................................................ 1,2 x IpnShort-time withstand thermal current Ith, 1s ............................................. 60 x IpnRating peak current Idyn ........................................................................... 2,5 x IthWorking temperature range ................................................................ -5...+40°CConformity with standards -PN-EN, EN, VDE, ANSI, BS, AS, CAN

Example of an order:

In the order shall be specified: type, ratio, Ith , load, class and number ofpieces, for example:KOKM1EB 8 150/1A/A, Ith = 60 x Ipn ,1VA 10P10 - 3 pieces

Cable Current Transformerstype KOKM (for ZX panels)

23ABB

0,5 1 10P10 5P10 5P20 0,5 1 10P10 5P10 5P2050 – – 0,5 0,5 0,5 – – 0,5 – –60 – – 0,5 0,5 0,5 – – 0,5 0,5 –70 – 0,5 1 1 0,5 – 0,5 0,5 0,5 –75 – 1 1 1 0,5 – 1 1 1 –100 – 2,5 1,5 1,5 0,5 – 1,5 1 1 –110 0,5 4 1,5 1,5 0,5 – 2,5 1 1 –120 1 4,5 1,5 1,5 0,5 0,5 3 1,5 1,5 –140 1 4,5 1,5 1,5 0,5 1,5 7 2 2 0,5150 1,5 6 2 2 0,5 1,5 7 2 2 0,5200 5,5 8,5 2,5 2,5 0,5 2,5 12 2,5 2,5 1240 5,5 20 2,5 2,5 0,5 8 25 3,5 3,5 1250 4,5 25 3 3 0,5 11 28 3,5 3,5 1300 12 40 3 3 0,5 15 40 4,5 4,5 1,5350 9 27 5 5 1 22 45 5 5 1,5400 22 40 4,5 4,5 1,5 30 60 6 6 2500 35 50 6 6 2 45 60 6 6 1,5600 60 60 6 6 1 60 60 5,5 5,5 –630 60 60 5 5 0,5 60 60 6 6 –800 60 60 5 5 – 60 60 7 7 –1000 60 60 6 6 – 60 60 – – –

PrimaryCurrentIpn [A]

Measurement classFS

Protection classFa

Measurement classFS

Protection classFa

Secondary current Isn = 1 [A] Secondary current Isn = 5 [A]Maximum permissible load [VA]

At special request can be delivered also current transformers with values of sec-ondary current different these given in the table above (e.g. 2 a or 4,3 A) andcurrent transformers for frequency 60 Hz.

Table for selecting current transformers KOKM 1 EB

74

60

32

170

70

M6

100

128

58

40

40 12

M3M5

24,5

1914,5

A

B

�72

KOKM 1 EB version 01

7756

5680

205

�72

0,5°

70

70

128

100M6

M61=S1

2=S2

~5m


8 56 80

KOKM 1 EB ... A B

Overal dimensions

24 ABB

KOKM 06 NN – is the indoor, cable, low voltage current transformer in resininsulation. Transformers of KOKM type are suitable for measurement of phasecurrents in low voltage switchgears. As the primary conductor is used the non-insulated busbar or the low voltage cable. Current transformers of KOKM seriescan be also used for measurement of the phase current at voltages even higherthen 0,72 kV, if the insulation of the high voltage primary conductor fulfils theequirements of elevant standards elating to the working voltage.

Technical data:

Type ............................................................................................... KOKM 06 NNMaximum number of windings .......................................................................... 1Level of insulation .................................................................................... 0,6/3/-Highest permissible voltage of the current transformer Ur ...................... 0,72 kVRating test voltage of insulation (50 Hz, 1 min Up) ....................................... 3 kVRating frequency ....................................................................................... 50 HzRating thermal current ............................................................................ 1,2 x IpnShort-time withstand thermal current Ith, 1s ............................................. 60 x IpnRating peak current Idyn ........................................................................... 2,5 x IthWorking temperature range ................................................................ -5...+40°CConformity with standards - PN-EN, EN, VDE, ANSI, BS, AS, CAN

Example of an order:In the order shall be specified: type, ratio, load, class and number of pieces,for example:KOKM 06 NN; 12 150/1 A/A, Ith = 60 x Ipn,1 VA 10P10 - 3 pieces

18 156 180

16 136 160

14 116 140

12 96 120

10 76 100

8 56 80

KOKM 1 EB ... A B


ok. 5

000

8

74

32

90

70

170

�72

max

6

M6

100

128

130

9050

3S

2S

1S

0,5°

A

BKOKM 1 EB 8 ver. 1

25ABB

0,5 1 10P10 10P20 5P10 5P20 0,5 1 10P10 10P20 5P10 5P2050 – – 3,5 1,5 – – – – 3 1 – –60 – – 4 2 – – – – 3,5 1,5 – –70 – – 5 2,5 – – – – 4,5 1,5 – –75 – – 5,5 2,5 – – – – 5 2 – –100 – – 7 3,5 7 1 – – 6 2,5 6 1110 – – 7,5 4 7,5 1,5 – – 7 3 7 1,5120 – – 8 4 8 4 – – 7 2,5 7 2,5140 – – 10 5 10 5 – – 9 3,5 9 3,5150 – – 10 5 10 5 – – 9 4 9 4200 – 8 14 7 14 7 – 9 13 5,5 13 5,5240 – 15 17 8,5 17 8,5 – 16 15 6,5 15 6,5250 – 19 18 9 18 9 – 19 16 7 16 7300 – 31 21 10 21 10 – 31 20 8 20 8350 0,5 50 25 12 25 12 – 50 22 10 22 10400 15 60 28 13 28 13 15 55 25 11 25 11500 35 90 34 16 34 16 35 60 31 14 31 14600 60 90 41 17 41 17 60 90 38 15 38 15630 60 90 42 18 42 18 60 90 39 16 39 16800 90 90 52 23 52 23 90 90 49 21 49 211000 90 90 66 28 66 28 90 90 63 26 63 261200 90 90 80 34 80 34 90 90 77 32 77 321250 90 90 82 35 82 35 90 90 79 33 79 331500 90 90 90 40 90 40 90 90 90 40 90 40


Measurement classFS

Protection classFa

Measurement classFS

Protection classFa


At special equest can be delivered also current transformers with values of sec-ondary current different these given in the table above (e.g. 2 a or 4,3A) andcurent transformers for frequency 60 Hz.

Table for selecting current transformers KOKM 06 NN

A

95.569

26.5M5

60

13

22

10

420

310

15

152 x Messingrohr 12x1,5

55

65

235

30

∅20

.5

KOKM 1 NN

12 120

9 90

6 60

KOKM 06 NN ... A

KOKM 1 NN 12

26 ABB

KOKM 06 LM – is the indoor, cable, low voltage current transformer in resininsulation. Transformers of KOKM type are suitable fo measurement of phasecurrents in low voltage switchgears. As the primary conductor is used the non-insulated busbar or the low voltage cable. Current transformers of KOKM seriescan be also used for measurement of the phase current at voltages even higherthen 0,72 kV, if the insulation of the high voltage primary conductor fulfils theequirements of elevant standards relating to the working voltage.

Technical data:

Type ............................................................................................... KOKM 06 LMMaximum number of windings .......................................................................... 1Level of insulation .................................................................................... 0,6/3/-Highest permissible voltage of the current transformer Ur ...................... 0,72 kVRating test voltage of insulation (50 Hz, 1 min Up) ....................................... 3 kVRating frequency ....................................................................................... 50 HzRating thermal current ............................................................................ 1,2 x IpnShort-time withstand thermal current Ith, 1s ............................................. 60 x IpnRating peak current Idyn ........................................................................... 2,5 x IthWorking temperature range ................................................................ -5...+40°CConformity with standards - PN-EN, EN, VDE, ANSI, BS, AS, CAN


In the order shall be specified: type, ratio, load, class and number of pieces,for example:KOKM 06 LM 12 150/1 A/A, Ith = 60 x Ipn, 1 VA 10P10 - 3 pieces

Table for selecting current transformers KOKM 06 LM

0,5 1 10P10 10P20 5P10 5P20 0,5 1 10P10 10P20 5P10 5P2050 – – 3,5 1,5 – – – – 3 1 – –60 – – 3,5 1,5 – – – – 3,5 1,5 – –70 – – 5 2,5 – – – – 4,5 1,5 – –75 – – 5 2,5 5 – – – 5 2 – –100 – – 7 3,5 5 1,5 – – 6 2,5 6 1,5110 – – 8 4 8 3,5 – – 7 3 7 2,5120 – – 8 4 8 4 – – 7 3 7 3140 – – 10 5 10 5 – – 9 3,5 9 3,5150 – – 11 5 11 5 – – 9 4 9 4200 – 11 13 7 13 7 – 11 13 5,5 13 5,5240 – 20 16 8,5 16 8,5 – 20 15 6,5 15 6,5250 – 23 18 9 18 9 – 23 16 7 16 7300 – 35 21 10 21 10 – 35 20 8 20 8350 12 55 25 12 25 12 12 55 22 10 22 10400 20 60 28 13 28 13 20 60 25 11 25 11500 40 90 34 16 34 16 40 90 31 14 31 14600 60 90 41 17 47 17 60 90 38 15 38 15630 60 90 42 18 42 18 60 90 39 16 39 16800 90 90 52 23 52 23 90 90 49 21 49 211000 90 90 66 28 66 28 90 90 63 23 63 231200 90 90 80 34 80 34 90 90 77 32 77 321250 90 90 82 35 82 35 90 90 79 33 79 331500 90 90 90 40 90 40 90 90 90 40 90 40


Measurement classFS

Protection classFa

Measurement classFS

Protection classFa


27ABB

KOKM 1 LM

A M5

95.5

69

26.5

17

22

400

280

130

55

65

30

210

15

15

2 x Messingrohr 12x1,5

∅20

.5

12 120

9 90

6 60

KOKM 06 LM ... A

KOKM 1LH – is the indoor, cable, low voltage current transformer in resin insula-tion. Transformers of KOKM type are suitable for measurement of phase currentsin low voltage switchgears. As the primary conductor is used the non-insulatedbusbar or the low voltage cable. Current transfo mers of KOKM series can bealso used for measurement of the phase current at voltages even higher then 1,2kV, if the insulation of the high voltage primary conductor fulfils the equirementsof elevant standards relating to the working voltage.

Technical data:

Type ................................................................................................ KOKM 06 LHMaximum number of windings .......................................................................... 1Level of insulation ....................................................................................... 1/6/-Highest permissible voltage of the current transformer Ur ........................ 1,2 kVRating test voltage of insulation (50 Hz, 1 min Up) ....................................... 6 kVRating frequency ....................................................................................... 50 HzRating thermal current ............................................................................ 1,2 x IpnShort-time withstand thermal current Ith, 1s ............................................. 60 x IpnRating peak current Idyn ........................................................................... 2,5 x IthWorking temperature range ................................................................ -5...+40°CConformity with standards - PN-EN, EN, VDE, ANSI, BS, AS, CAN


In the order shall be specified: type, ratio, Ith, load, class and number of pieces,for example:KOKM 1 LH 12 150/1 A/A, Ith = 60 x Ipn, 1 VA 10P10 - 3 pieces

KOKM 1 LM 12

28 ABB

0,5 1 10P10 10P20 5P10 5P20 0,5 1 10P10 10P20 5P10 5P2050 – – 2 1 0,5 0,5 – – 1,5 1 0,5 0,560 – – 2 1 0,5 0,5 – – 2 1 1 0,570 – – 2,5 1 1,5 1 – – 2,5 1 1,5 175 – – 2,5 1 1,5 1 – – 2,5 1,5 2 1100 – 1,5 3,5 1,5 3,5 1,5 – 1,5 3 1,5 3 1,5110 – 3 4 1,5 4 1,5 – 2,5 3,5 1,5 3,5 1,5120 – 3,5 4 1,5 4 1,5 – 3,5 3,5 1,5 3,5 1,5140 – 6 5 1,5 5 2 – 7,5 4,5 2 4,5 2150 – 8,5 5,5 2 5,5 2 – 8,5 5 2 5 2200 4 20 7,5 2 7,5 3 2,5 11 7 2,5 7 2,5240 9 30 8,5 3,5 8,5 3,5 9 29 8,5 3 8,5 3250 10 32 9 3,5 9 3,5 10 33 9 3,5 9 3,5300 17 50 11 4 11 4 19 50 10 4,5 10 4,5350 29 60 12 4,5 12 4,5 29 60 12 5,5 12 5,5400 60 90 12 3 12 3 39 60 14 6 14 6500 60 90 15 4 15 4 50 90 18 8 18 8600 60 90 18 5,5 18 5,5 60 90 21 8,5 21 8,5630 60 90 19 5,5 19 5,5 60 90 21 8,5 21 8,5800 90 90 20 5,5 20 5,5 90 90 26 9 26 91000 90 90 26 7 26 7 90 90 27 5,5 27 5,51200 90 90 31 8,5 31 8,5 90 90 30 6 30 61250 90 90 31 8 31 8 90 90 32 6,5 32 6,5


Measurement classFS

Protection classFa

Measurement classFS

Protection classFa


At special request can be delivered also current transformers with values of sec-ondary current different these given in the table above (e.g. 2 a or 4,3A) andcurrent transformers for frequency 60 Hz.

Table for selecting current transformers KOKM 06 LH

126

60

37

235

117.

5

3710

200

20018012690

M8�11

B

A

1914.5

58

40

24,5

40 12

M3M5

�130

KOKM 1 LH version 01

12 120 90

9 90 60

6 60 30

KOKM 1 LH ... A B

126

70

37

2 26

90

235

117,

5

3710

M8�11

�130

BA

90126180200200

37

II

II

II

II

31

40

M5M5

30,5

KOKM 1 LH version 02

12 120 90

9 90 60

6 60 30

KOKM 1 LH ... A B

29ABB

KOKM 1 NJ – is the indoor,cable, low voltage current transformer in resin insula-tion. T ansformers of KOKM type are suitable for measurement of phase currentsin low voltage switchgears. As the primary conductor is used the non-insulatedbusbar or the low voltage cable. Current transformers of KOKM series can bealso used for measurement of the phase current at voltages even higher then 1,2kV, if the insulation of the high voltage primary conductor fulfils the equirementsof elevant standards elating to the working voltage.

Technical data:

Type .................................................................................................. KOKM 1 NJMaximum number of windings .......................................................................... 1Level of insulation .................................................................................... 0,6/3/-Highest permissible voltage of the current transformer Ur ........................ 1,2 kVRating test voltage of insulation (50 Hz, 1 min Up) ....................................... 6 kVRating frequency ....................................................................................... 50 HzRating thermal current ............................................................................ 1,2 x IpnShort-time withstand thermal current Ith, 1s ............................................. 60 x IpnRating peak current Idyn ........................................................................... 2,5 x IthWorking temperature range ................................................................ -5...+40°CConformity with standards - PN-EN, EN, VDE, ANSI, BS, AS, CAN


In the order shall be specified: type, ratio, Ith, load, class and number of pieces,for example:KOKM 1 NJ 12 150/1 A/A, Ith = 60 x Ipn, 1 VA 10P10 - 3 pieces

Table for selecting current transformers KOKM 1 NJ

0,5 1 10P10 10P20 5P10 5P20 0,5 1 10P10 10P20 5P10 5P2050 – – 2 1 0,5 0,5 – – 2 0,5 0,5 0,560 – – 2,5 1 0,5 1 – – 2,5 1,5 0,5 0,570 – – 3 1,5 1,5 1,5 – – 3 1,5 1 175 – – 3,5 1,5 2 1,5 – – 3 1,5 1,5 1100 – 0,5 4,5 2 4 2 – 0,5 4 1,5 4 1,5110 – 2 5 2,5 4,5 2,5 – 1,5 4,5 2 4,5 2120 – 3,5 5,5 2,5 5,5 2,5 – 3 5 2 5 2140 – 5 6,5 3 6,5 3 – 4,5 6 2,5 6 2,5150 – 6,5 7 3 7 3 – 5 6,5 3 6,5 3200 1,5 8 8 3,5 8 3,5 1 9 9 4 9 4240 4,5 13,5 9,5 4,5 9,5 4,5 4,5 14 10 5 10 5250 5 15 10 4,5 10 4,5 5 15 11 5 11 5300 9 23 12 5,5 12 5,5 11 26 13 6 13 6350 18 35 14 6,5 14 6,5 18 32 15 7 15 7400 29 50 16 7,5 16 7,5 20 40 18 8 18 8500 35 80 20 9 20 9 30 60 20 10 20 10600 50 90 24 11 24 11 45 90 25 12 25 12630 50 90 25 11 25 11 50 90 26 12 26 12800 60 90 31 14 31 14 90 90 30 13 30 131000 90 90 38 16 38 16 90 90 38 14 38 141200 90 90 42 18 42 18 60 90 40 13 40 131250 90 90 45 18 45 19 60 90 40 12 40 12


Measurement classFS

Protection classFa

Measurement classFS

Protection classFa


At special request can be delivered also current transformers with values of sec-ondary current different these given in the table above (e.g. 2 a or 4,3A) andcurrent transformers for frequency 60 Hz.

KOKM 1 NJ 8 ver. 1

30 ABB

74

8

32

ok 5

000

max

6

70

�72

170

0,5°

90

120

148

M6

A

B

130

9050

KOKM 1 ED

10570

26

�155

27

55

247

M8�11

5512

010

90

105

215

235

235

93

40

55

30.5

3731

M5 M5

AB

KOKM 1 NJ version 02

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KOKM 1 NJ version 01

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31ABB

Current Transformerstype KOLTFor Oil-immersed Transformers

Dimensional drawing

1S... 2S... ...S...

D

1S5 1S4 1S3 1S2 1S1

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32 ABB

Technical dataPrimary current range Ipn [A] ..................................................... 100A to 2 500ARated secondary current Isn [A] ........................................................... 1A or 5AInsulation level .................................................................................... 0.72 / 3 / -Range of rated output Sn [VA] ..................................................... 1VA to 90VANumber of windings ................................................................................... 1 to 4Conformity with Standards IEC, PN-EN, SEV, VDE, ANSI, BS, CAN, CSA, GOSTAccuracy class acc. to IEC .................... 0.2s; 0.5s; 0.2; 0.5; 1; 3; 5; 5P; 10P; PXFS ................................................................................................................ 5; 10ALF ....................................................................................... 5; 10; 15; 20; 25; 30Rated frequency f [Hz] ............................................................................... 50, 60Short-time withstand thermal current, 1s Ith [A] ................... 100xIpn max. 100kAPeak withstand current Idyn [A] ........................................... 2,5xIth max. 250kAInsulation class acc. to IEC .............................................................................. BMin. inside diameter f A [mm] ................. min. 30 mm depending on parametersMax. outside diameter f B [mm] ..........max. 900 mm depending on parametersHeight h [mm] ......................................max. 900 mm depending on parametersLength of leads D [mm] ......................... 1m, other length at the client’s request

Transformers with other dimensions and parameters are available at the client’srequest.

1. Versions available

- single phase- with one or several windings- with one or several tappings- insulation – cotton tape + impregnating varnish- without housing- without primary winding

2. Application

The current transformers type KOLT are suitable for mounting inside power trans-formers and are suitable for operating immersed in oil, under conditions of mod-erate and tropical climate. These current transformers are designed for supply-ing measurement and protection circuits of power systems operating under ratedfrequency of 50 Hz.

3. Marking

Each current transformer is fitted with rating plate in accordance with IEC 60044-1 Standard. Values of rated voltage and rated power frequency test voltage ofinsulation – stated on the rating plate – relate to the insulation of secondarywindings. Primary and secondary terminals are directly marked on the currenttransformer.

4. Description

Current transformers type KOLT have neither housing nor primary winding. Un-der operating conditions the primary winding is the power transformer’s bushinginsulator, which is at the same time the main insulation of the current trans-former. The secondary windings are evenly wound on the circumference of thetoroidal core.

Secondary winding insulation is made of polyester tape (torlen).

Current transformers with the weight of approx. 100kg or more consist of severalparts – to facilitate both transport and installation. Each separate part containsthe following information: a serial number which coincides with the one stated onthe rating plate as well as markings of primary and secondary winding terminals.

5. Transport

While transported current transformers must be protected against humidity andheavy shocks. Current transformers with the weight exceeding 50kg and currenttransformers especially sensitive to shocks are transported on wooden pallets.

KOLT 072 115 x 235 x 60

KOLT 072 230x260x45

33ABB

6. Installation

During installation of current transformers observe the following instructions:

- Secondary winding marked 1S1- 1S2 should be placed on the top;- Pay special attention to keep the same polarization for all parts of the current

transformer (P1 – P2 – P1 – P2 markings); .- Avoid shocks.

7. Compliance with Standards

Current transformers meet the requirements of the following standards:IEC 60044-1

At the client’s request we manufacture current transformers meeting the require-ments of SEV, VDE, ANSI, BS, CAN, CSA, GOST Standards

8. Ordering

The order must contain the following:

- name and type of current transformer- rated primary current / rated secondary current Ipn/Isn [A]- short-time thermal current, 1 s Ith [kA]- rated output power and accuracy class of each winding Sn [VA]- limit transformer dimensions (min. inside diameter, max. outside diameter,

max. height)- length of leads- standard- quantities.

9. Order example

Current transformer type KOLT1200/5/1/1 AIth = 72 kAI. 15VA , class 0.5 FS10II.60VA , class 5P15III. 60VA , class 5P20min. inside diameter A = ∅150 mmmax. outside diameter B = ∅300 mmmax. height h = 200 mmlength of leads 1,5 mStandard IEC 60044-1quantity – 9 pcs.

34 ABB

Note

ABB Sp. z o.o.Power Technologies Divisionul. Leszno 5906-300 Przasnysz, PolandPhone: (+48 22) 52 52 838, 51 52 831

(+48 29) 75 33 223, 75 33 240Fax: +48 22 51 52 659, +48 29 75 33 327

www.abb.com

cable current transformers types: kolma,...

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