变电站双母线母差保护模块化改造方案的设计

Design of modular transformation scheme for double bus differential protection in Substation

在变电站以及发电厂的日常使用当中,母线是不可或缺的重要部分,承载着十分重要的工作任务,一般情况下用于电能的汇聚与分配。对于变电站而言,如果其进出线的回数大于4,就可以考虑设置母线。双母线在工程上具有很多优点,比如其能够提供稳定的供电、调度也十分灵活并且电源与负载处于均衡状态,通常其线路是由两个母线分别与一个断路器、两组隔离开关相连而形成的。正是由于这样的连接状态,导致母线一旦发生故障,与它相接的进线与出线均会产生问题,需要进行断电处理。由以往的数据经验可以看出,当母线两端的进出线总量高于8条时,就可以对母线进行分段处理以避免上述提到的强制停电操作,在涉及电路维修时也能够减少倒闸处理,从而使得供电的稳定性与可靠性大大提升。

In the daily use of substations and power plants,the bus is an indispensable part,carrying a very important task,generally used for the collection and distribution of electric energy.For the substation,if the number of incoming and outgoing lines is more than 4,the bus can be considered.Double bus has many advantages in engineering,for example,it can provide stable power supply,dispatching is also very flexible,and the power supply and load are in a balanced state.Usually,its line is formed by two buses connected with a circuit breaker and two groups of disconnectors respectively.It is because of this connection state that once the bus fails,the incoming and outgoing lines connected to it will have problems,which need to be cut off.It can be seen from the previous data experience that when the total number of incoming and outgoing lines at both ends of the bus is more than 8,the bus can be segmented to avoid the above-mentioned forced power outage operation,and the switching treatment can be reduced when circuit maintenance is involved,so as to greatly improve the stability and reliability of power supply.