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NanoAmor
Current Transformer Cores for Power System
1. Brief introduction:
    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, and is thus more competitive in the application of precise current transformer with 0.2, 0.2s, and 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.

2. Characteristics
2.1 Comparison of different core materials
Property
Nanocrystalline 
cores
Permalloy cores
Si-steel
 cores
Saturation induction (T)
1.25
0.76
2.03
Initial permeability (at 0.8 mA/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 (oC)
570
400
740
Thickness (mm)
0.025 ~ 0.035
0.1
0.3
Stacking factor
≥ 0.75
0.9
0.95
 
2.2 Advantages of nanocrystalline alloy core
- High permeability¨Dsmaller error in the measurement of current
- High saturation Induction ¨D smaller size and lighter weight when compared to Permalloy
- Excellent thermal stability¨DCan work at -55~130oC for a long time
- Low cost¨DIdeal for replacing commercial permalloy cores

3. Specification£º (Case material£º stainless steel£©
Part NO.
Core Dimensions (mm)
Case Dimensions (mm)
OD
ID
HT
OD
ID
HT
MSCT-01
55
37
20
60
32
25
MSCT-02
115
90
10
120
85
15
MSCT-03
260
200
35
265
195
41
MSCT-04
280
205
90
285
200
97
MSCT-05
350
250
30
355
245
35
MSCT-06
390
260
25
395
255
30
MSCT-07
450
360
20
455
355
25
MSCT-08
485
445
15
490
440
20
MSCT-09
540
435
40
546
429
46
MSCT-10
600
460
65
606
454
71
MSCT-11
875
720
20
883
712
27
MSCT-12
1050
800
30
1058
792
37
Note: Cores of other specifications are available upon request.
 
    Nanostructured & Amorphous Materials, Inc.
    1526 Katy Gap Road, #302
    Katy, TX 77494, USA
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