Multipurpose Non-Contact Loading Transformer

Design and Operating Principle

УБКТ is a single-phase transformer, consisting of two parts: stationary and moving. The moving part travels by means of screw-type device. There is split primary coil, which as a rule is connected to linear line voltage of 380 V, on the moving part.

There is changeable secondary winding on the stationary part.

Current and voltage control on secondary winding is performed by stepless change of magnetic flow by means of its redistribution during moving part travel.

Specification

It is possible to load different types of protections by primary current up to 6,000 A in a long-time mode by means of УБНТ.

It is possible to get current up to 10,000 A for short term (within not more than 30 s).

Secondary winding is easy to remove off the core. This makes it possible to install necessary type of secondary winding depending on nature of the work performed. Secondary winding has three modifications:

1. Сurrent, split:
   1. copper bus bar 13х19 mm parallel I₂= 6000 A, U₂=4,75 V
   2. sequentially 3х2=6 turns I₂= 2000 A, U₂=14,25 V
2. Welding-current:
   1. copper bus bar 3х19 sequentially 24 turns
      I₂= 300 A, U₂=60 V.
   2. Three sections with 8 turns each parallel
      I₂= 1000 А, U₂=20 V.
3. 3. Voltage winding for 1000 V:
   1. 840 turns (when primary winding is connected to voltage of 220 V);
   2. wire ø 1.56 (2.00 mm², ПЭТВ-2).
   3. Primary winding has 168 turns (12 layers with 14 turns each).
   4. Supply voltage U₁ = 400 V
   5. Primary winding rated current I₁ = 72 А
   6. Core is made of transformer steel of 3406 Grade with Δ0.3 mm
   7. Section S_ж = 64 cm²