Instrument Transformer Cores - China

Applications

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.

Characteristics

Comparison of different materials

Property Antainano®cores permalloy cores Si-steel

cores

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

commercially

Core identification

Core design

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

Assembling

50≤OD1＜10 0 ≤30 8≤e≤30 NANO-1 B, E

100≤OD1＜2 50 ≥10 15≤e≤60 NANO-1 A, B, C, D, E

10≤e＜15 NANO-2 A, B, D, E

250≤OD1＜3 60 ≥10 15≤e＜60 NANO-1 A.B.C.

D

10≤e＜15 NANO-2 A, B, D

360≤OD1＜4 50 ≥10 15≤e＜60 NANO-2 A, B

10≤e＜15 NANO-3 A, B

450≤OD1≤65 0 ≥20 20≤e＜60 NANO-3 A, B

Assembling

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:

• Posted By: Advanced Technology & Materials Co.,Ltd.(AT&M)

• Phone: 62443851

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

• Email:

• Website: http://atm-amorphous.com

• 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.