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Combined instrument transformer

JUK 123a

JUK 123a combined instrument transormers are used

to eed measurement and protection systems

in electrical power grids with the highest operating voltage

o 123 kV and requency o 50 Hz. They are used in grids

with isolated or eectively grounded zero point. JUK 123a

transormers are suitable to operate in outdoor conditions

in moderate climate zones at an ambient temperature

ranging rom 233K (-40C) to 313K (+40C) and a relative

humidity o up to 100% at 303K (+30C), and at the altitude

not exceeding 1000 m above sea level.

Design

A JUK 123a combined instrument transormer comprises current

and voltage modules encapsulated in a common air tight housing

lled with transormer oil. The transormer housing comprisesthe ollowing parts (bottom upwards): a bottom container with

a voltage module inside, a porcelain or composite insulator,

a head with a current module and shielded expansion bellows.

A terminal box is xed to the bottom container made o

aluminium-alloy. Secondary current and voltage circuits as well

as screens ends are led out to the box. Terminal strips allow the

connection o the 10 mm2 wires and can be urnished with uses

or voltage circuits or surge arresters or current circuits. Current

and voltage winding terminals used or electric energy settlement

can be suited or sealing. The terminal box is tted with two M32

cable glands (throttling range rom 11 mm to 21 mm) and two

M40 cable glands (throttling range rom 19 mm to 28 mm).The hollow insulator is made o brown porcelain with creepage

distance required or III class o pollution. Grey coloured

composite insulator with creepage distance required or IV class

o pollution can be mounted at client's request. Current module

primary connection terminals are mounted in a head made o

aluminium-alloy. P2/A terminal is common or current and voltage

module. Standard terminals are fat 100 mm or 200 mm wide

terminals made o aluminium. I requested 30 mm or 40 mm

copper or aluminium bolt terminals can be made. Combined

instrument transormer main insulation is made o cable paper

saturated with transormer oil. Thermal oil volume changes are

compensated by stainless steel expansion bellows placed on the

upper part o the combined instrument transormer. Combined

instrument transormer is environmentally sae due to a small

amount o oil. Spacing o the xing holes used to mount thecombined instrument transormer to a support structure equals

450 x 450 mm. Combined instrument transormer can be tted

with two terminal boxes, other type o secondary terminals

(e. g. threaded), covers or secondary terminals sealing, number

and size o glands etc.

Primary fat terminals

< 1250 A >1250 A

Realization

Combined instrument transformer weight

in porcelain insulator

in composite insulator

550 kg

450 kg

Oil weight

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JUK 123aParameter Value

Compliance with the standards IEC 60044-3; PN-EN 60044-3

Rated primary voltage 110: 3 kV

Highest system voltage 123 kV

Rated power frequency withstand voltage at 50 Hz 230 kV

Rated lighting impulse withstand voltage1.2/50 s 550 kV

Minimum creepage distance 3640 mm (porcelain) or 3800 mm (composite)

Rated frequency 50 Hz

Total weight 550 kg (porcelain) or 450 kg (composite)

Insulation oil weight

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3/4Combined instrument transformer JUK 123a 3

Dimensional drawing

oil level indicator

4 x 30

rating plate

lifting eyes

secondary

terminal box

brown porcelain

insulator

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2127PL256-W2-en.

Edition07.2010

Contact us:

ABB Sp. z o.o.

Branch in Przasnysz

59 Leszno Str.

06-300 Przasnysz, Poland

Phone: + 48 29 75 33 324, +48 29 75 33 038

Fax: +48 29 75 33 329

www.abb.pl

We reserve the right to make technical changes or modiy the contents o this

document without prior notice. With regard to purchase orders, the agreed particulars

shall prevail. ABB does not accept any responsibility whatsoever or potential errors

or possible lack o inormation in this document.

We reserve all rights in this document and in the subject matter and illustrations

contained therein. Any reproduction, disclosure to third parties or utilization o its

contents in whole or in parts is orbidden without prior written consent o ABB.

Copyright 2010 ABB

All rights reserved