Zero-Sequence Current Transformer Cores
The zero-sequence current transformer core is designed for measuring current in transformers and measurement instruments. It can facilitate in measuring current, voltage power, etc. Measurement is performed precisely because the core meets micro-current transformer requirements: 1, reliable insulation, 2, sufficiently high measurement accuracy and 3, when a large current is measured that would normally lead to line failure when the transformer should be saturated (500% of the rated current) it is brought back to an appropriate range to protect the measurement instruments.
Features:
The zero-sequence current transformer core uses a nanocrystalline alloy saturation magnetic induction Bs between silicon steel and permalloy. The lower the value, the more beneficial it is to reduce Bs instrument security factor. The nanocrystalline alloy and permalloy make these cores more suitable for the production of high-precision transformers. These materials also provide a lightweight and more economical solution when producing this equipment.
♦ High permeability - transformers have greatly improved accuracy
♦ Light weight, low cost - prices significantly lower than permalloy
♦ Excellent stability - operating temperature range of -30-120℃
♦ Weak leakage current sensitive, with excellent resistance to high-current shocks
♦ Core surface protection technology to prevent core debris
Applications:
♦ Electronic leakage protection switch ring core transformers
♦ Electromagnetic leakage protection switch ring core transformers
Performance Comparison:
| Performance | Nanocrystalline core | Permalloy core | Silicon steel core |
| Saturation magnetization (T) | 1.25 | 0.76 | 2.03 |
| Initial permeability (0.8mA/cm) | 40,000-80,000 | >80,000 | 1,000 |
| Permeability | >250 ， 000 | >200,000 | 40,000 |
| density (g/cm3) | 7.2 | 8.85 | 7.65 |
| Curie temperature (℃) | 570 | 400 | 740 |
| With thick(mm) | 0.025-0.035 | 0.1 | 0.3 |
| Lamination factor | ≥0.75 | 0.9 | 0.95 |
