基于两相电流差和线电压的中低压线路自适应保护

Adaptive protection for middle and low voltage line based on phase-to-phase differential current and phase-to-phase voltage

首先利用动模实验数据验证了线路两相电流差的特性,根据此特性,提出了基于两相电流差和线电压的中低压线路自适应保护方案,该保护方案具有故障类型和运行方式自适应的特点。然后,分析了该自适应速断保护的性能,并与传统电流速断保护、距离保护以及电流闭锁电压速断保护进行分析比较,阐明了该自适应速断保护的优越性。

First, this paper validates the characteristic of phase-to-phase differential current using the experiment data. According to this characteristic, it presents an adaptive protection for middle-low-voltage transmission line based on phase-to-phase differential current and phase-to-phase voltage. This protection has the trait of adapting to the type of phase fault and the operating conditions of power system. Then, it analyses the performance of this adaptive instantaneous trip protection, and compares with the conventional current instantaneous trip protection, distance protection and voltage instantaneous trip with current blocking. And the superiority of the adaptive instantaneous trip protection is elucidated.