DC immune CT Cores and Components made of NANOPERM® LM for Smart Meters

Our DC immune tape wound cores for Smart Meters are based on the nanocrystalline material 
NANOPERM® LM.




Compared to conventional Metering cores the NANOPERM® LM products show following benefits:

  • High linearity over the whole primary current range
  • Easy to compensate
  • Very low temperature drift
  • DC immune acc. to IEC 62053; EN 50470-3
  • Ready for the next regulation update reg. supplementary Power Factor conditions

Standard designs for Core finishing:

  • Plastic box (material UL listed, QMFZ2 E41938)

CT Cores with other dimensions or permeability levels are also available upon request as well as complete wound CT Components (see checklist).

 

Standard CT Cores, DC immune

Click on core type to show data-sheet

Type

DC Immunity
[A]

lfe
[cm]

afe
[cm2]

µ @ 50Hz,
H = 1A/cm

Nom. Dim.
da x di x h
[mm]

Finished Dim.
Da x Di x H
[mm]

Fix

M-389

20

5,4

0,09

3.400

19,1 x 15,2 x 6

20,5 x 13,8 x 7,8

Case

M-749

40

5,5

0,12

3.400

20 x 15,3 x 6

22 x 13,8 x 8

Case

M-375

60

6,1

0,12

2.000

22 x 17 x 6

23,4 x 15,8 x 7,8

Case

M-880

80

6,2

0,08

1.600

21,5 x 18 x 6

22,9 x 16,8 x 7,7

Case

M-361

100

7,1

0,11

1.600

25 x 20,1 x 6

26,5 x 18,8 x 7,8

Case

M-391

120

8,6

0,12

1.600

30 x 24,8 x 6

31,4 x 23,6 x 7,6

Case

M-433

160

10,4

0,12

1.600

35,5 x 30,5 x 6

37,8 x 28,7 x 8

Case


Standard CT Components, DC immune

Click on CT type to show data-sheet

Type

Ip max
[A rms]

Idc, max
[A peak]

N1 : N2

φ(I)
[°]

L
[H]

Rcu
[Ω]

Rb
[Ω]

Dim.
Da x Di x H
[mm]

Style

MB-389*

20

20

1 : 2.500

4,8

4,4

< 80

37,5

28,5 x 5 x 14

Pin

MB-489*

Lace

MB-749*

40

40

1 : 2.500

3,8

4,8

< 83

12,5

28 x 5,5 x 16

Pin

MB-849*

Lace

MB-375

60

60

1 : 2.500

4,9

2,9

< 67

12,5

30,5 x 8,5 x 14

Pin

MB-475

Lace

MB-880*

80

80

1 : 2.500

7,9

1,6

< 65

10,75

30 x 9,5 x 15

Pin

MB-980

Lace

MB-361

100

100

1 : 2.500

5,1

1,9

< 50

7,5

34 x 11,5 x 14

Pin

MB-461

Lace

MB-391*

120

120

1 : 2.500

4,3

1,7

< 45

6,25

40 x 12 x 17,5

Pin

MB-491

Lace

* preliminary

Ip max:  Max. AC Primary Current
Idc, max:  Max. half wave rectified AC amplitude without saturation
φ(I):  Max. Phase Error for I < Ip,max
L:  Nom. Inductance for I < Ip,max
Rcu:  Winding resistance
Rb:  Recommended Burden Resistor, so Ub is ca. 0,3 V

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last update: 2013-04-08