• The core of conventional transformers consists of stacks of laminations that are made from silicon steel with an almost uniform crystalline structure (CRGO). In transformers with amorphous core, a ribbon of steel is wound forming the core.
  • Amorphous metal is a unique alloy that exhibits a molecular arrangement that is random in structure, rather than the organized crystalline structure of CRGO core steel. Due to its unique molecular structure, amorphous metal cores are more readily magnetized and demagnetized when energized, resulting in significantly lower energy loss compared to CRGO steel. AMDT technology is considered mature and has been proven to be reliable
  • Biggest advantage of amorphous metal core transformers is that amorphous steel has lower hysteresis & Eddy current losses resulting in very Low No Load Current, Energy and less heat, when compared with conventional CRGO Core Transformers



Benefits and Savings of AMDT (Amorphous Metal Core Distribution Transformer):

  • Advantages of Amorphous Metal Core, owing to its inherent characteristics, leading to superior electrical performance:
    • Easy magnetization occurs by means of high permeability, low coercivity & hysteresis loss
    • Low magnetic losses occurs by means of low coercivity, low eddy current loss, high permeability & high resistivit
    • Fast flux reversal occurs by means of low magnetic loss
    • Best performance under harmonics (Non Linear Loads
    • Above unique & inherent features of AMDT contributes to less energy consumption during magnetizing and demagnetizing in each cycle of supply current due to very low hysteresis and eddy current losses
    • Very less heat generated in AMDT when compared with conventional CRGO Core Distribution Transformers
  • When compared to similar rated conventional CRGO core distribution transformer, No load loss (which remains constant irrespective of the magnitude of the load) of AMDT will be lesser by about 75%, which is very significant commercially
  • Reduced CO2 emissions and fossil fuel consumption
  • Reduced No load (magnetizing) current
  • Reduced temperature rise of the magnetizing Core
  • Cumulative savings in energy cost and reduced ownership costs. Typical payback period for the differential cost between AMDT and Conventional CRGO Transformer of the same rating is less than one year

Ratios of Losses are tabulated below for Amorphous & CRGO Cores

Amorphous Core CRGO Cores
Eddy Current Losses Hysteresis Losses Eddy Current Losses Hysteresis Losses
Linear Loads 33% 67% 67% 33%
Non-Linear Loads 1.3 X Linear Loads 1.8 X Linear Loads

Comparison of Key Features of Amorphous Metal (Vs) CRGO Steel Transformers

Properties Units Amorphous Metal Core Grade 2605 SA1 CRGO Steel Grade-M4(Stacked Core)
Density g/cm2 7.19 7.65
Specific Resistance 130.00 45
Saturation Flux density Tesla 1.58 2.03
Typical Core loss at 50 Hz Watts/kg 0.22@1.4T 0.89@1.5T
Nominal Thickness mm 0.025 0.27
Annealing Temperature 0C ~360(possible for Magnetic Filed Annealing) ~800
Core construction & Assembly Wound core construction with lap jointing for ready use. Assembly of sheared &cut laminations.
Productivity Comparatively high & less wastage Low
Core Steel Grade Single grade with uniform quality Multiple grades with varying quality
No load Losses Very low(as much as 75% less) when compared with CRGO core transformers Comparatively high
Coil winding Concentric rectangular shaped coils for better space factor. Concentric circular coils.
Repairability Repairable* Video clipping on repair Repairable

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