拉林电气化铁路对牵引站附近变电站继电保护影响分析

Influence of Electrified Railway on Relay Protection In Substations Near Traction Stations

指出电铁机车在用电过程中产生大量的负序与谐波,并且电铁机车沿铁路沿线移动用电,产生的危害性远比其他负荷更为严重。阐述了拉林铁路牵引机车运行对电网各牵引站谐波的影响,并介绍了电气化铁路电能质量对继电保护、线路保护、母线保护的影响,认为大幅提高周边电源点与电网的负序水平,改变周边电网的短路电流水平及故障特性,从而对继电保护装置的正常运行造成影响。在对拉林电气铁路引起附近电源点与电网的谐波与负序分量进行分析的基础上,对不同原理不同类型的保护设备进行了分析,研究了电能质量对继电保护装置的影响,提出了可行的解决方案。

It is pointed out that a great deal of negative sequence anti harmomc wave are Produced of electric locomotive using electricity, and the harm caused by moving electric locomotive along the railway is much more serious than other loads. The influence of traction locomotive running on harmonics of traction sta- tions in Lalin Railway is analyzed and calculated, and the influence of power quality of electrified railway on re- lay protection, line protection and bus protection is introduced. It is considered that the negative sequence level of the peripheral power supply point and the power grid will he greatly increased, and the short circuit current level and fault characteristics of the peripheral power grid will be changed, thus affecting the normal operation of the relay protection device. Based on the analysis of the harmonic and negative sequence components of the nearby power supply point and power grid caused by La-Lin Electric Railway, this paper analyzes the different types of protective equipment with different principles, studies the influence of power quality on relay protec- tion devices, and puts forward feasible solutions.