Nanocrystalline cores

LTCT / HTCT Cores

High Performance Nanocrystalline Low & High Tension Current Transformer Cores

Nanocrystalline Grade LTCT and HTCT Precision Cores

Engineered with high-permeability Grade 1k107 materials, these cores provide extreme accuracy for low and high-tension current sensing.

Industrial Grade Current Sensing Cores for 50Hz Applications

Nanocrystalline Grade 1k107 cores offering high saturation flux density (~1.2T) and a wide permeability range (80k–250k). Available in various casing formats including stainless steel (SS), plastic, and resin-crepe, these cores are engineered for durability, minimal loss, and accurate current measurement. The construction supports single and multi-stacked configurations based on ribbon width availability, ensuring flexibility in design.

Technical Specifications

NOTE: Four point testing as highlighted is done for 100% to ensure core performance.

AC test at 50 Hz
Induction (B) T	Field (Heff) milliamp /cm
0.01	1.1
0.05	3.2
0.1	5
0.2	7.2
0.3	8.8
0.5	11.6
0.7	15
0.9	16
1	26

Casing Options & Construction

Parameter	Specification
Casing Types	Stainless Steel (SS), Plastic, Resin + Crepe
Construction Option	Multi-stacked construction available for cores exceeding 40 mm height
SS Shell	Non-magnetic stainless steel (0.8–1.2 mm)
Insulator Ring	Press board (1–1.5 mm)
Filler	Silica gel or suitable adhesive
Tape	PVC (≥3 kV insulation)

Ordering Format:

Bare Core: OD × ID × Ht
SS Casing: OD+5 × ID–5 × Ht+5 mm
Plastic Casing: OD+3 × ID–3 × Ht+4 mm
Resin + Crepe: OD+1 × ID–1 × Ht+2 mm

Core sizing parameters

PML offers toroidal cores with outer diameters up to 1000 mm and a wide range of standard heights based on ribbon widths from 5 mm to 40 mm. Multi-stacked core constructions are also available.

Material Properties

Nanocrystalline Grade 1k107 Comparison

Material Properties
Magnetic Properties	Properties	Nano Crystalline	Amorphous
	Bs (Tesla)	1.25	1.56
	Br (Tesla)	0.6 ~ 0.7	0.8
	μ i(min) at 50Hz and Hmax = 0.8mA/cm	>80,000	>1100(at 1000Hz)
	μ max(min) at 50 Hz	>2,00,000	-
	Hc(max) (A/m)	0.8	4
	Core loss(max)(W/kg) at 50Hz	0.5	0.5
Chemical Composition	%Fe	Balance %	Balance %
	%Cu	1%	0%

Flux Densities

FLUX DENSITY (T)	WATTS/KG
0	0.00000255
0.02	0.0000155
0.03	0.0000496
0.04	0.00011
0.05	0.000197
0.06	0.00031
0.07	0.000442
0.08	0.000596
0.09	0.000765
0.1	0.000957
0.2	0.00346
0.3	0.00683
0.4	0.0109
0.5	0.0156
0.6	0.0207
0.7	0.0261
0.8	0.0317
0.9	0.0377
1	0.044
1.2	0.083

Comparison of Core Materials

Comparison of different materials
Property	Nanocrystalline cores	Permalloy cores	Si-steel cores	Soft ferrite
Saturate induction (T)	1.2	0.76	2.03	0.5
Initial permeability (AC) (0.8mA/cm)	40,000 ~ 100,000	> 80,000	1,000	>1500
Maximum permeability	>250,000	> 200,000	40,000	20000
Density (g/cm³)	7.25	8.85	7.65	4.8
Curie temperature (°C)	570	400	740	200
Thickness (mm)	0.025 ~ 0.035	0.1	0.3	-