Aimed at the problem of PT HV fuse burning down frequently in the 10kV power system of the 2# transformer of one substation in Yunnan Province, this paper analyzes the causes of the PT HV fuse burning problems, and points out the main cause is the 3th harmonic voltage in 10kV power system. This paper puts forward a method to solve the problem of PT HV fuse burning down frequently by installing a passive filter. This passage briefly introduces the theory of passive filter, analyzes the contents of the design of passive filter, and designs a passive filter based on the actual situation of this system. Last, according to the actual situation of the substation, this paper carries out a case analysis on PSCAD simulation software. The simulation result shows that PPF can availably avoid the problem of PT HV fuse burning down frequently caused by higher order harmonics.%本文针对云南省某变电站2#主变10kV系统中出现的PT高压熔断器频繁熔断问题，分析了PT高压熔断器熔断的原因，指明该问题是10kv系统三次电压谐波导致的。提出通过安装无源滤波器的方法，避免该变电站的PT高压熔断器频繁熔断。简述了无源滤波器的原理，分析了设计无源滤波器时应考虑的内容，并根据该系统的实际情况设计了无源滤波器。最后，根据该系统的实际运行情况，在PSCAD仿真软件上进行了算例分析。仿真结果表明，采用无源滤波器能够有效避免由高次谐波引起的PT高压熔断器频繁熔断。
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