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POWERIT

CURRENT / VOLTAGE TRANSFORMER

TYPE JUK 123a

2GKK610061-EN

ABB

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APPLICATION

Current / voltage instrument transformers type JUK 123a are intended for measurement and circuit protection ofhigh voltage line substations with the highest voltage of 123 kV at 50 Hz frequency, in effectively earthed andcompensated systems. The combined Instrument transformers are one-phase devices for outdoor application intemperate climate - temperatures from 233 K (-40 C) up to 314 K (+40 C), humidity up to 100% at 303 K(+30 C), altitudes up to 1000 m above the sea level.

DESIGN

Current / voltage instrument transformer type JUK 123a consists of a current and voltage modules enclosed in acommon aluminum, hermetic casing filled with transformer oil. The casing consists of the following parts:

- bottom tank with voltage transformer- porcelain or composite insulator- head with current transformer- shielded expansion bellows.

The bottom aluminum tank is equipped with current and voltage secondary contacts and terminals of equi-potentialscreens. Terminal blocks make it possible to connect up to 10mm

2wires and can be equipped with fuses for

voltage or surge arresters for current circuits. The voltage and current circuit contacts which are meant for poweraccounting can be sealed up.The terminal box is equipped with two cable glands PG 21 (the choke range from dim.13 mm up to dim.18 mm) ortwo glands PG29 (choke range from dim.18 mm to dim. 25 mm). The hollow insulator is made of brown porcelainand has a creepage distance for III class of pollution. On request a silicone hollow insulator with creepage distancefor IV class of pollution can be used. The primary current terminals are located in the aluminum head of thetransformer.The P2/A terminal is common for voltage and current transformers. The terminals can be executed as either stud(copper, dim. 30 or 40 mm) or flat clamp (made of aluminum) type. Standard dimensions of a flat terminal areshowed on the drawing below. The expansion bellows, located in the upper part of a transformer and made ofstainless steel compensate for thermal changes of oil-volume. Main electrical insulation is made of electrical gradecable paper which is impregnated with transformer oil. On request the transformer can be equipped withcoordinating spark gap, two secondary terminal boxes, different types of secondary terminals (e.g. screwed type),covers for sealing and other dimensions and number of cable glands. Depending on thermal currents values,reconnection ratio and the number of cores and their parameters the current / voltage instrument transformer maybe executed as:

I. standard unitII. unit of smaller head and less oil content.

PRIMARY TERMINALS

Execution I II

Total weight (incl. oil):

porcelain insulator

silicone insulator

Max. 650 kg580 kg

Max. 500 kg430 kg

Insulating oil weight 150 kg 100 kg

STANDARDS

IEC 60044-3

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TECHNICAL DATA CURRENT / VOLTAGE INSTRUMENT TRANSFORMER JUK 123a

Sl.No Parameter Value

1. Type JUK 123a

2. Standards IEC 60044-3; PN-E 06553:2000

3. Rated primary voltage 110: 3kV

4. Highest system voltage 123kV

5.Rated power frequency

withstand voltage 50 Hz230kV

6.Rated lighting impulsewithstand voltage 1,2/50 s

550kV

7. Minimum creepage distance 3640 or 3800 mm with silicone insulator

8. Rated frequency 50Hz

9. Total weight see table

10. Insulating oil weight see table

11.Dimensions see dimension drawing

Current transformer

Rated primary currentA

Rated 1s thermal currentkA

Rated dynamic currentkA

20 6 1525 6 15

40 12 30

50 20 50

100 40 100

150 40 100

200 40 100

300 50 125

400 50 125

500 50 125

600 50 125

800 50 125

1000 50 125

1200 50 1251600 50 125

2000 50 125

3000 63 157

12.

reconnectable 1:2 or 1:2:4 (thermal currents values are subject to change)

13. Rated secondary current 1 A or 5 A

14. Rated continuous thermal current 120% or 150% or 200%

15.Number of cores:

- measuring- protection

1-51-31-4

16.Measuring cores parameters:

- total rated output- accuracy class

2,5 - 30 VA0,1

2,5 - 60 VA0,2 or 0,2 S

2,5 - 120 VA0,5 or 0,5S

17.Protection cores parameters:

- total rated output- accuracy class

2,5 - 120 VA5P or 10P

Voltage transformer

18. Voltage factor and time 1,5/30s or 1,9 / 8h

19.Number of windings:

- measuring- protection

1-51-41-3

100: 3 V or 110: 3 V20.

Measuring windings parameters:- rated secondary voltage- total rated output- accuracy class

10 - 75 VA0,1 or 0,1 i 3P

10 - 150 VA0,2 or 0,2 i 3P

10 - 400 VA0,5 or 0,5 i 3P

21.

Residual windings parameters:- rated secondary voltage- rated output- accuracy class

100: 3 V or 110: 3 V25 VA or 50 VA

3P or 6P

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CURRENT / VOLTAGE INSTRUMENT TRANSFORMER JUK 123aDIMENSION DRAWING

2500

Execution D H

I standard 2070 2735

II with smaller head 1990

secondary terminal box

D

H

O652

12

for fixing

4xO24

450 518628

for lifting

earth clamps

4xO30

A

90

200

P1 P2 C

B

The manufacturer reserves the right to introduce changes resulting from technical developments.

ABB Sp. z o.o.Branch Office in PrzasnyszLeszno 59 Street,06-300 Przasnysz, POLANDPhone: +48 29 75 33 252 , Fax: +48 29 75 33 329

I1n A B C

1250 A 818 120 40

203000 A 920 120 Flat 20

ABB

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