Indoor current transformer AT for high voltage applications

Current transformers type AT are designed for installation in the power and distribution transformers and the shunt reactors.

AT transformers type have a multicoil frame construction, have no primary winding and exist in two design variants. All the subtypes are epoxy resin-free, instrument transformers AT 35 and AT 41 turret design are designed as full metal non-oxidizing body, on the contrary AT 38 active parts design is designed without any metal in the body and only oil absorbing materials including High Density Casein Laminated Pressboard are used. Total number of inner dimensions variants in the AT portfolio is twenty, rated primary current is up to 10 000 A, rated short-time thermal current is up to 100 kA (1s).

Any accuracy class defined by international standards is possible:
IEC 61869-1; 61869-2; IEC 60044-1; IEC 60044-6; ANSI/IEEE C57.13; GOST 7746-2001; 

Product scope

Highest voltage for equipment.............  1, 2 kV
Primary current...................................   Up to 10 000 A
Frequency...........................................   50 Hz or 60 Hz  

Key benefits  

  • Multi-coil transformer representative is designed as one set focused on easy manipulation
  • AT can be mounted around existing pass or bushing in oil
  • Pre-assembled design secures rigid coil fixation and easy and fast installation/servicing procedure

Key features

  • Epoxy free
  • Variety of diameters – in range of 300 mm to 1055 mm
  • Transient classes performance – for protection transient phenomenon
  • Tested according to the latest standards IEC 61869-1, IEC 61869-2
  • Two designs – oil absorbing and full metal design according to type of usage

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