| 1. Strong overload ability |
| Dry type high-capacity high-low-voltage power transformer core and coil are not air-conditioned, which improve |
| the overload ability. Filled with quartz sand the resin thermal conductivity is 2-3 times of that of the pure |
| resin. When the load loss of same capacity of transformers equals, as the hot melt of transformer windings filled |
| with quartz sand is big, thermal time constant of winding is big, the short-time overload ability of the |
| transformer is strong. |
| 2. High electricity performance |
| The initial distribution of thunder and lighting impulse voltage along windings impacts the damage degree of |
| transformer winding insulation. The initial voltage distribution of foil winding approach linear, therefore, |
| Zhiheng dry type transformers have very good impact-resistant ability against thunder and Lightning. |
| 3. Good anti-cracking performance |
| The dry type transformer coil of our company adopts filled resin casting and complete foil structure, which of |
| subject to kinds of anti-cracking experiment (as cold and heat alternating experiment, thermal impact experiment |
| and rapid ageing experiment), the experiment proves that transformers of our company can satisfy the requirement |
| high wet and hot and locations of large temperature scope, and also can satisfy the crack-resistant requirement |
| after long-term running. |
| 4. Low partial discharge value |
| The coil adopts foil structure, only one inter-turn electric potential (only 15 ~ 65V) between cakes of HV |
| windings,which make the inter-layer insulation work voltage quite low. Therefore the electric field of coil get |
| improved, the partial discharge value can be very low, which is the concentration externalization of foil winding |
| coil superiority. |
