Enamel Wire for Current Transformer

Enamel wires are critical materials for miniature current transformers. The basic parameters of the most popular used enamel wires are introduced as below. The diameter of bare core range from 0.10mm to 0.31mm. For a typical mini current transformer of 10(100)A/10mA with turns ratio 1:1000, the enamel wire of Φ0.18mm is suitable. For some CT with rate current > 200A, the enamel wire as thick as Φ0.31mm is required.

Enamel Wire for Current Transformer

Core Diameter	Outer Diameter	Section Area	Unit Weight	Current Allowed (J=2.5A/mm2)	Current Allowed (J=3A/mm2)	Resistance (20°C)
mm	mm	mm2	kg/km	A	A	Ω/km
0.10	0.125	0.0079	0.070	0.0197	0.0237	2240
0.11	0.135	0.0095	0.085	0.0237	0.0285	1850
0.12	0.145	0.0113	0.101	0.0282	0.0339	1550
0.13	0.155	0.0133	0.118	0.0332	0.0399	1320
0.14	0.165	0.0154	0.137	0.0385	0.0462	1140
0.15	0.180	0.0177	0.158	0.0442	0.0531	994
0.16	0.190	0.0201	0.179	0.0502	0.0603	873
0.17	0.200	0.0227	0.202	0.0567	0.0681	773
0.18	0.210	0.0254	0.227	0.0640	0.0762	688
0.19	0.220	0.0284	0.253	0.0710	0.0852	618
0.20	0.230	0.0315	0.280	0.0787	0.0945	558
0.21	0.240	0.0347	0.309	0.0867	0.1040	507
0.23	0.270	0.0415	0.370	0.1030	0.1240	423
0.25	0.290	0.0492	0.437	0.1230	0.1470	357
0.27	0.310	0.0573	0.510	0.1430	0.1710	306
0.29	0.33	0.066	0.589	0.165	0.198	266
0.31	0.35	0.0755	0.673	0.188	0.226	233

Manufacturing Process

Mini Current Transformer: Production Process

Related Products

Current Transformer Winding Coil