Current instrument transformers type J 123
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Current Instrument Transformer J 123 J 123 current instrument transformers are used to feed measurement and protection systems in electrical power grids with the highest operating voltage of 123 kV and a frequency of 50 Hz. They are used in grids with isolated or effectively grounded zero point. J 123 transformers are suitable to operate in outdoor conditions in moderate climate zones at an ambient temperature ranging from 233K (-40°C) to 313K (+40°C) and a relative humidity of up to 100% at 303K (+30°C), and at the altitude not exceeding 1000 m above sea level. Design A current transformer type J 123 consists of active current transformer parts enclosed in an aluminum, hermetic casing filled with transformer oil. The casing consists of the following parts: - bottom basis, - porcelain or composite insulator - head with current transformer, - shielded expansion bellows. A terminal box is fixed to the bottom container made of aluminium-alloy. Secondary current circuits as well as screens' ends are led out to the box. Terminal strips allow the connection of the 10 mm2 wires and can be furnished with surge arresters for current circuits. Current winding terminals used for electric energy settlement can be suited for sealing. The terminal box is fitted with two M40 cable glands (throttling range from R19 mm to R28 mm). The hollow insulator is made of brown porcelain with creepage distance required for III class of pollution. Grey coloured composite insulator with creepage distance required for IV class of pollution can be mounted at client's request. Current module primary connection terminals are mounted in a head made of aluminium-alloy. Standard terminals are flat 100 mm or 200 mm wide terminals made of aluminium. If requested 30 mm or 40 mm copper or aluminium bolt terminals can be made. Current instrument transformer main insulation is made of cable paper saturated with transformer oil. Thermal oil volume changes are compensated by stainless steel expansion bellows placed on the upper part of the current instrument transformer. Current instrument transformer is environmentally safe due to a small amount of oil. Spacing of the fixing holes used to mount the current instrument transformer to a support structure equals 450 x 450 mm. Current instrument transformer can be fitted with two terminal boxes, other type of secondary terminals (e. g. threaded), covers for secondary terminals sealing, number and size of glands etc. < 1250 A > 1250 A Power and productivity for a better world1

lecnnical data J 123 Parameter Value Compliance with the standards PN-EN 60044-1, IEC 60044-1 Rated primary voltage 110: 73 kV Highest system voltage 123 kV Rated power - frequency withstand voltage at 50 Hz 230 kV Rated lighting - impulse withstand voltage1.2/50 550 kV Minimum creepage distance 3625 mm (porcelain) or 3800 mm (composite) Rated frequency 50 Hz Total weight 350 kg (porcelain) or 310 kg (composite) Insulation oil weight <80 kg Dimensions: W x H x D according to the dimensional drawing nt module Rated current [A] Rated 1s thermal Rated dynamic current [kA] current [kA] 50 20 |...

IIUI IblUI Idl UldvVlliy 994 Secondary terminal box Current Instrument Transformer J 123 3

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