桥电一厂停机后花园系统部分线路零序保护定值存在的问题及分析

Existing Problem and Analysis of Zero Sequence Protective Constant Value of Huayuan System's Partial Line after Stopping Unit of Qiaotou Thermal Power Plant's First Branch

电网继电保护整定值对系统运动方式变化的适应能力是有限的 ,随着系统运行方式的变化 ,应及时校核继电保护装置的选择性、灵敏性。文章针对青海电网的“火电最小运行方式” ,分析在桥电一厂停机后 ,与之密切相关的青海电网 1 1 0kV花园系统零序电流保护定值存在的问题 ,并以尽可能保持系统原定值为基础 ,提出具体方案 ,既满足了新的运行方式 。

Because the electric net's relaying constant value's adapting ability is very limited to vary after the running mode of system,the paper analyses existing problem of zero sequence current protective constant value of Qinghai electric power net's Huayuan sunstation system after stopping unit of Qiaotou thermal power plant,and puts forward concrete scheme which can satisfy the new running mode and can decrease workload