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  • Instrument Transformer Cores - China

    price: contact company for price


    Current transformer of power system plays an important role

    in providing a current in its secondary winding proportional

    to the alternating current flowing in its primary. They are

    commonly used in metering and protective relaying in the

    power plants and substations where they facilitate the safe

    measurement of large currents, often in the presence of high

    voltages. The current transformer safely isolates

    measurement and control circuitry from the high voltages

    typically present on the circuit being measured.

    Comparing with the traditional core material, such as

    silicon steel and permalloy, Iron based nanocrystalline

    alloy takes the advantage of high permeability and low cost,

    it is more competitive in the application of precision

    current transformer with 0.2, 0.2s, 0.1 accuracy class,

    Bushing current transformer for Epoxy resin cast, Gas

    insulated or oil-immersed switchgears, LV, MV and HV

    switchgear, and other apparatus in electric power

    transmission and distribution system.


    Comparison of different materials

    Property Antainano®cores permalloy cores Si-steel


    Saturate induction T 1.25 0.76 2.03

    Initial permeability(0.8mA/cm) 40, 000~80, 000 >80, 000

    1, 000

    Maximum permeability >250, 000 >200, 000

    40, 000

    Density (g/cm3) 7.2 8.85 7.65

    Curie temperature (°C) 570 400 740

    Thickness (mm) 0.025~0.035 0.1 0.3

    Stacking factor ≥0.75 0.9 0.95

    Advantages of nanocrystalline alloy core

    • High permeability―lead to minimized current measuring

    error in CT

    • High saturation Induction ―lead to small size and light

    weight compared to Permalloy CT

    • Excellent thermal stability―Can work at -55~130°C for

    long time

    • Low cost:Ideal for substitute of permalloy cores


    Core identification

    Core design

    OD1(mm) H1(mm) e=(OD1-ID1)/2(mm) Guaranteed curve


    50≤OD1<100 ≤30 8≤e≤30 NANO-1 B, E

    100≤OD1<250 ≥10 15≤e≤60 NANO-1 A, B, C, D, E

    10≤e<15 NANO-2 A, B, D, E

    250≤OD1<360 ≥10 15≤e<60 NANO-1 A.B.C.D

    10≤e<15 NANO-2 A, B, D

    360≤OD1<450 ≥10 15≤e<60 NANO-2 A, B

    10≤e<15 NANO-3 A, B

    450≤OD1≤650 ≥20 20≤e<60 NANO-3 A, B


    Code Case materials Fixed materials Case cover materials

    Core dimension(mm)

    OD1 ID1 H1

    A stainless steel crepe paper bakelite

    ≥100 —— ——

    B silica gel ——

    C Aluminum crepe paper Aluminum buckle ——

    —— ≥10

    D bakelite —— —— ≤20

    E Aluminum silica gel Epoxy resin

    ≤250 —— ——

    Products specifications

    Part No. Core Dimensions Finished Dimensions

    od(mm) id(mm) ht(mm) OD(mm) ID(mm) HT(mm)

    ON-055037020 55 37 20 60 32 25

    ON-115090010 115 90 10 120 85 15

    ON-260200035 260 200 35 265 195 41

    ON-280205090 280 205 90 285 200 97

    ON-350250030 350 250 30 355 245 35

    ON-390260025 390 260 25 395 255 30

    ON-450360020 450 360 20 455 355 25

    ON-485445015 485 445 15 490 440 20

    ON540435040 540 435 40 546 429 46

    ON-600460065 600 460 65 606 454 71

    ON-875720020 875 720 20 883 712 27

    ON-1050800030 1050 800 30 1058 792 37

    Note : Cores with other specifications can be provided

    concerning to customer's demand.

    Instrument Transformer Cores

    Feel free to contact us with all your questions

    Company Contact:

    • Phone: 62443851

    • Address: No.76 Xueyuan Nanlu,Haidian,Beijing 100081,China, beijing, China

    • Email: Email

    Published date: November 8, 2012 -

    • Business Description: National Amorphous and Nanocrystalline Alloy Engineering Research Center(NAC), located in Beijing, P.R.China, is No.1 manufacturer of amorphous and nanocrystalline magnetic materials in China. The foundation of NAC was established in 1995 as a division of CISRI. In 1999 NAC was acquired and merged into a new company called AT&M Co. LTD. as Amorphous Products Branch. With an exciting background of Chinese pioneering achievements, patents and know hows.

      NAC develops and produces a series of Antaimo® ribbon & cores and Antainano® ribbon & cores as well as components which are used in a wide spectrum of applications in power electronics and electronic information industry.

      As the leading manufacturer of amorphous materials and products in China, we devote to offer full solution for magnetic components and meet customer' needs.

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