Improved Reliability and Security of Supply

The use of HT distribution leads to improved reliability and security of supply for the subsequent purpose:

1. The faults on HT lines are far less compared to those of LT lines.

2. In order to prevent theft in LT lines from transformer to consumer premises, commonly Aerial Bunched Cables (AB Cables) are used to supply power at LT to consumer from the distribution transformer. Along with AB Cables, the faults on LT lines are eliminated. That, in turn, reduces the failure of distribution transformers and enhances reliability of supply.

3. Because the number of little distribution transformers is high in HVDS, the failure of one transformer does not affect supply to other consumers linked to other transformers. Within the event of failure of distribution transformers, only a little number of consumers (2 to 3 power consumers or 10 to 15 domestic consumers) would be affected. Instead, a large distribution transformer supplies power by LV distribution lines to even remotely located consumers in LVDS. Thus, the failure of an existing large size distribution transformer would affect a group of 40 to 50 power consumers and/or 100 to 200 domestic consumers.