Application field:

Measuring current transformers used in power system and transformers applied to precision measuring instrument.

Performance characteristics:

Cores made of Fe-based nanocrystalline ribbons, with intermediate saturation flux density,

high permeability and low loss, can effectively reduce the current error and phasic error of

transformers. The saturation flux density  (B_s) of nanocrystalline alloys is between ferrite and

permalloys. And the lower B_s value, the more beneficial to reduce the instrument safety

factor. When  there is breakdown in the system, big current passes the current transformer,

and cores is easier to be saturated, the secondary current is no longer rise in proportion,

thus the secondary instruments is protected. The permeability of nanocrystalline alloys is

close to permalloy, and an order of magnitude higher than silicon steel, therefore suitable for

being used as  transformer cores with high accuracy. The density and stack coefficient of

nanocrystalline alloys is lower than permalloys, and when both cores are in the condition of

same dimension and similar performance, the mass of the former is lighter more than a

quarter, and the manufacturing cost is a third lower or so.  In addition, the  lnanocrystalline

alloys with a more wider linear range han permalloys, can work a long time between

-55~130, and have good temperature stability.

Performance Comparison of Nanocrystalline Core, Permalloy and Silicon Steel: