Base Material Characteristics

Base Material: Nickel Iron material
Ribbon Thickness: 60-300 µm
Ribbon Density: 8.250 - 8.745 g/cm3
Curie Temperature: 400 - 410 °C
Continuous Service Temperature: 150 °C

Code	Material	Band Thickness(mm)	Permeability µ4	Permeability µmax	Saturation Induction (T)
Enni 80	72-83% Ni	0.05-0.2	60 000-240 000	150 000-350 000	0.6-0.8
Enni 55	54-68% Ni	0.05- 0.2	40 000-80 000	100 000-160 000	1.2-1.5
Enni 50	45-50% Ni	0.1-0.2	10 000-12 000	90 000	1.5-1.6
Enni 40	35-40% Ni	0.2- 0.3	4000-9000	50 000-75 000	1.3-1.5

Electro magnetic properties on toroidal cores

Features:

• High permeability
• Low magnetization in higher inductions
• High saturation flux density >0.6T-1.5T
• Robust design
• Completed with varnished form, impregnated form and also with plastic case
• Cased are UL94V-0 compliant
• Comprehensive range of sizes

Benefits:

• High efficiency
• Low temperature rise
• Smaller component size
• Higher power throughput
• High temperature operation

Aplications:

• Current Transformers
• Power Transformers
• Pulse Transformers
• Current Sensors
• Earth Leakage Circuit Breakers
• Measuring Industry

Mechanic and Electromagnetic Guaranteed Values:

Dimensions and Mechanical Tolerances

Electromagnetic Guaranteed Values

 

Mechanic and Electromagnetic Guarantied Values:

If not agreed for a specific magnetic value with customers C-Cores have the following Magnetic values (measuring frequency 50 Hz. - cut surface quality C)

Material	Tape thickness (mm)	Magnetizing force  Heff (A/cm)	Measured B (T) for LFe (cm)				Color marking
			<=20	<=40	<=80	>80
Nickel - Iron Alloys (50%Ni) ENNI® 50	0.20	0.02 0.25	0.0235 0.47	0.029 0.64	0.032 0.78	0.034 0.88	Green Yellow
Nickel - Iron Alloys ( 70....80% Ni ) ENNI® 80 Saturation Induct.? 0.75T	0.20	0.005 0.05 1	0.009 0.11 0.52	0.0125 0.16 0.58	0.015 0.21 0.60	0.0175 0.25 0.61	Red

Outside diameter d1 mm	Tolerance	Inside diameter d2 mm	Tolerance	Height Tolerance		Core Winding Wide Tolerance	Core Winding Wide = C
<= 75	± 2.0	<= 50	± 2.0	+0.8		± 0.4	c= 0.5 * ( d1-d2)
<= 150	± 2.0	<=100	± 2.0	+1.5		± 0.6
<= 250	± 3.0	<= 200	± 2.0	+1.5		± 1.0
<= 350	± 3.0	<= 300	± 3.0	+2.0		± 1.0
<= 500	± 4.0	<= 450	± 4.0	+2.0		± 1.5
> 500	± 4.0	<= 450	± 4.0	+3.5		± 2.0

Some advice on using of Split Tape Cores

1. Split Tape Cores are specially packaged in pares so that damage to the cut surfaces are prevented.
2. Mechanical and electro-magnetic quality control sheets are provided.
3. Core halves are marked with paint in order to ensure the halves are of one pair. Halves from different pairs should not be assembled as a pair.
4. Before the assembly cut surfaces should be thoroughly cleaned.
5. In order to decrease the magnetic sound, halves of small types can be stuck together with adhesive, bigger types need to be banded. After assembly it should be ensured that no-load - losses are normal, if not the air gap should be decreased.

Type of assembling and dimensions

Toroidal Cores in Different Forms
Special Toroidal Cores for Instrument Transformers and special transformers are produced according to customer specifications. Some of these are as follows:

1. Cross-Section Cores
2. Oval Cores
3. Conic Cores
4. Rectangular Cores

Measurement tolerances and required magnetic characteristics of these special cores should be given by the customer. The insulation of these special cores is also performed according to customer specifications.

Size Calculations C-Cores

Standard Electrical Guarantees
If not agreed for a specific magnetic value with customers C-Cores have the following magnetic values (measuring frequency 50 Hz. - cut surface quality C)

Material	Tape thickness (mm)	Magnetizing force Heff (A/cm)	Measured B (T) for LFe (cm)							Color marking
			<=20	<=40		<=80			>80
Nickel - Iron  Alloys (50%Ni)  ENNI® 50	0.20	0.02  0.25	0.0235  0.47		0.029  0.64		0.032  0.78	0.034  0.88		Green Yellow
Nickel - Iron  Alloys ( 70-80%  Ni)  ENNI® 80  Saturation Induct.?   0.75T	0.20	0.005 0.05 1	0.009 0.11 0.52		0.0125 0.16 0.58		0.015 0.21 0.60	0.0175 0.25 0.61		Red