Magnetic shielding system for a differential current transformer in a circuit breaker to provide shielding at multiple locations

A magnetic shielding system for a Differential Current Transformer to provide shielding at multiple locations, the magnetic shielding system comprises:

• a magnetic core that may be either ring laminations or tape-wound;
• a first layer axial shields (top and bottom made of any magnetic shielding material from 80% Ni class of materials);
• a first layer radial shields (inner and outer made of any magnetic shielding material from 80% Ni class of materials);
• a second layer radial inner shield;
• a second layer radial outer shield;
• a second layer axial shield bottom;
• and
• a housing of the Differential Current Transformer, wherein shielding is characterized by a 2-layer shielding system,
• wherein both first and second layers of shielding are present at locations:
• radially inside, radially outside, and axially top and bottom, and
• wherein a material of the second layer of shielding surrounds the first layer of the shielding, and wherein the first layer of shielding is nearest to the core.