In what ways is China's distribution grid lagging behind?

Compared with the developed level of foreign countries, China's distribution network is undoubtedly backward, which does not need to be argued. The main reason is that there are too many historical debts, on the one hand, the time factor, China's distribution network development time is not long, Japan has begun to plan the distribution network in the 1950s; On the other hand, because of economic factors, the state investment is so much, for a long time, the power grid at all levels are very happy, and the money is invested in the main network with obvious results, such as before it seems to be said to implement 20kV distribution network, and later to engage in UHV, there is no below, and so on. As for the gap, it is a comprehensive gap, as far as I have seen in a capital in Africa, the level of a distribution network that the French have helped build can definitely explode the level of most cities in China, and the overall planning concept can be said to exceed the domestic level.

1) Planning ideas and landing

This is definitely the foreign advantage over the domestic place, but also the key. In fact, many places in the country, not only the power grid, planning is very worrying, because there are too many constraints and shortsighted. As far as the distribution network is concerned, most places still stay at the level of headache and foot pain, and the distribution network project declared every year is not like this? Where the transformer is overloaded, where the line bayonet, etc., anyway, there is no unified long-term grid and wiring planning, giving people the feeling that there is no long-term idea. Of course, the southern network and Jiangsu and Zhejiang areas are slightly better, such as the three-double wiring of Zhejiang power grid reflects the overall planning idea.

In fact, why the reliability level of the domestic main network in the world is not because the overall planning is relatively long-term, although a little redundant, but at least it is good, but to the distribution network here, it is not the case.
You can look at the developed level of foreign distribution network wiring planning.






Singapore 20kV petal wiring, of course, I am not saying that this grid must be perfect, and the fact that there are some small problems, but at least the concept and ideas are worth learning. There are dumbbell wiring in France, mesh wiring in the United Kingdom, and the overall multi-segment multi-contact wiring in Japan's medium voltage distribution network, not to mention very mature. The current situation in the country is that the more developed places are transitioning towards these goals, and it will take some time.

2) Blackout time

Just put a picture, not a bunch of nines or anything like that.



In fact, in this way, the indicators of China's developed areas can also be (default indicators are true and correct), probably equivalent to the United States, but it can not be compared with Japan, Japan's distribution network is really abnormal, and their fine and strict play to a good level.
Not to mention the overall level, which is obvious from the graph.以上翻译结果来自有道神经网络翻译（YNMT）· 通用场景

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