摘要
为了实现“一流配电网”建设目标,改变原有偏重于考虑电力系统需求的方案转变为兼顾消费者用户需求的方案,线路开关保护定值制定策略的瞬时段让渡时间,向下与分界开关保护的配合协调,将原有的保护分界向下游延伸至重要用户,向上与变电站变压器配合,形成一套以变电站变压器为基准相对固定的定值;同时辅以分界开关及长线路的中间开关以及其相应保护区段相配合,克服原有的保护方案依赖于线路长度,受运行方式影响无法保证配合选择性的特点。在此基础上,可以有效实现“地县调整定一体化系统”,实现配网定值管理的自动化。
In order to achieve the “first-class distribution network” construction goal, the original scheme focusing on the demand of the electric power system is changed into the other one combined with the user’s demand. The line switch protects transient time of the instantaneous period in the setting value strategy, and coordinates with boundary switch protection. It extends the original protected boundary to important users downstream, and coordinates with the transformer substation upstream, forming a set of relatively constant value based on the substation transformer. At the same time, with the coordination of boundary switch, intermediate switch of long transmission lines and its related protection section, the characteristics of the original protection scheme are overcome, namely, relying on the length of transmission lines and failure to guarantee the selective coordination because of the influence of the operation mode. On this basis, the “county adjustment setting integrated system” can be effectively achieved so as to realize the automation of distribution network setting management.
