Description

Nano-crystalline cores for voltage independent RCCBs

BH Loop or Hysteresis Loop plotting machine is capable of plotting magnetisation curves at various frequencies (AC measurements) or at near zero frequency (DC measurement). Various properties such as permeability, coercivity, watt loss etc are measured using closed loop geometries such as washers (also known as lamination).

Main advantage of BH curves is it enables the user to know all important magnetic properties at any given magnetisation level. Hence it is not only used as a qualifying parameter in the inspection plan but also used to fine tune manufacturing processes.

Only drawback is its limitations on using washers (closed loop geometries) for the measurements.

AC magnetic properties:

  • AC magnetic Properties - as per ASTM A912/A912M- 04/IS 649
  • Toroids /Washers : from 10 mm to 50 mm Inner Diameter(I.D.) and Outer Diameter up to 1.2 X I.D. Stack Height or Thickness up to 25 mm
  • B-H Curve(hysteresis loop)
  • Frequency - 40 Hz to 1kHz
  • Magnetic field - 0 to +/- 25 kA/m
  • Induction - up to 3 Tesla
  • Hc - as low as 0.1 A/cm

Various properties that can be measured are - BH curve, magnetic polarization at desired peak field level, Remanence, Coercivity, Watt loss per kg at specific induction level etc…

Epstein Test Frame - as per IEC 404-2:

  • Strips: 280 x 30 mm and 305 x 30 mm size, up to 1.6 mm thickness
  • Frequency - 50Hz

Various properties that can be measured are - BH curve, magnetic polarization at desired peak field level, Remanence, Coercivity, Watt loss per kg at specific induction level etc…

DC Magnetic Properties: