大型火力发电机组进相运行时对断路器要求的仿真研究

Simulation and Requirements Study for Circuit Breaker Connected with Underexcited Turbo-Generator

本文通过电磁暂态仿真,研究了大型火力发电机组进相运行时对断路器的要求。计算结果表明:西门子公司生产的420 kV—SP_4型SF_5断路器可以在发电机进相运行并发生主变压器高压侧故障时在较短时间内灭弧。文中还介绍了一种利用现有数据构筑系统母线电源模型的新方法。

In order to assess the operation security of large turbo-generator units, the electromagnetic transient simulation of circuit breaker tripped when the generator operating in underexcited state is introduted in this paper. Instead of small resistance, V-A characteristic is employed to modeling the arc in the tripping breaker. The obtained result shows that the breaker works well even if the turbo-generator has been operating in underexcited state as long as the V-A characteristic of the former is satisfactory. A new approach to modeling the system bus is proposed. This approach can be considered as a general method.