2.5MW风力发电机组断路器频繁跳闸故障原因分析

Frequently Tripping Analysis of 2.5 MW WTGS Circuit Breaker

某风电场2.5 MW风力发电机组网侧电容器漏液导致断路器跳闸故障,在更换跳闸断路器后的3~8 h仍频繁发生跳闸故障。从拆解设备、测量温度、分析运行情况等方面进行原因分析,发现设计方案中将2台1.5 MW机组变流器并联组成2.5 MW机组变流器,在机组运行过程中,2台变流器互相调制产生谐波,使得断路器内部电流互感器的铁心产生高温,从而烧毁与其并列安装的测量线圈,导致断路器频繁跳闸。根据故障原因,采取了更换变流器内部数据线和改变机组的调制频率等处理措施。经测试,改装后机组运行稳定。

Capacitor fault of grid side in 2.5 MW wind turbine resulted in tripping failure of the breaker. The breakers were also breakdown after replacing the new one 3 to 8 hours later. This paper summarized the main factors that affected tripping of circuit breaker, which was from the modulation frequency through the research about dismantling device, temperature measurement and analysis of running unit analysis. The harmonic was produced from the 2.5 MW unit converter which was consist of two 1.5 MW unit converter in parallel. The harmonics was produced by the both of converter modulation in the process of unit operation, which resulted in current transformer core to produce high temperature burning the measuring coil, so the circuit breaker frequent tripping. The problem was resolved by changing the data line and the modulation frequency.