Doing a good job of lightning protection of distribution transformers and reducing the risk of damage to the transformer by lightning is of great significance to the safe and stable operation of the distribution network.
According to the design of lightning overvoltage protection, it needs to include the design of line lightning shielding, lightning intrusion wave overvoltage protection, etc.
The lightning protection design of the substation needs to combine the operating experience of the substation, the topography, the existing distribution lines in the area, and the intensity of lightning activities.
Carry out calculation analysis and technical and economic comparison, follow the principle of differentiation, and determine the protection plan.
For 10 kV distribution transformers, Y or Yn wiring is widely used at present.
According to the requirements of the design regulations, in addition to installing a lightning arrester on the high-voltage side, a complete over-voltage protection scheme should also design a lightning arrester on the low-voltage side, and reasonably control the distance between the arrester and the transformer.
In the overvoltage protection operation, many distribution transformers are not protected by lightning arresters on the low-voltage side, which undoubtedly affects the lightning protection effect;
However, the transformers equipped with lightning arresters on the high and low voltage sides have not escaped the threat of lightning damage. It can be seen that the protective effect of installing lightning arresters on the low voltage side is effective.
From the perspective of the installation method of the lightning arrester, it is necessary to ensure the lightning protection effect.
The lightning arrester should be as close as possible to the transformer, installed between the transformer and the high-voltage fuse, and the “three-in-one” grounding method should be adopted when wiring.
Experimental results show that the closer the distance between the arrester and the transformer, the better the protection effect.
One Response
Hi there, I discovered your website by way of Google
whilst looking for a comparable topic, your site
came up, it appears great. I’ve bookmarked it in my google bookmarks.
Hello there, just became aware of your weblog via Google, and found
that it’s really informative. I am gonna watch out for brussels.
I’ll appreciate for those who continue this in future. Numerous other
people can be benefited out of your writing. Cheers!