优化方案翻译.docx

3.
线路参数测试的实用优化方案 A Practical Optimized Method of Circuit
Parameter Test
两个及以上T接点的联络线如图 2~4，在计算220kV A变电站516断路器保护时，需 要测试A-b、A-c、(A-d)、(A-e)、A-F线路的阻抗值；在计算 220kV F变电站504断 路器保护时，需要测试 F-c、F-b、( F-d)、( F-e)、F-A线路的阻抗值。通过分析线路阻 抗的理论值，在对线路电源端的 220kV A站和F站的断路器继电保护进行计算时，为保证
距离、零序I段不伸入下级变电站主变，选择正序、零序阻抗最小的某段线路如 A-b和F-c
进行计算；为保证距离、零序U段对全线有灵敏度，选择正序、零序阻抗最大的线路如 A-c
和F-b或A-F进行计算。通过分析，对线路参数测试方案进行如下优化： 选择阻抗值最小和
最大的A-b、F-c、A-c、F-b或A-b、F-c、A-F进行参数测试。测试次数由 5至9次减少到3
至4次。
The wires of Two or more T connection points are shown in figure 2~4. When the protection of 516 circuit breaker of the 220kV A transformer substation is computed, the impedance circuits of wire A-b, A-c, (A-d), (A-e), and A-F should be tested. When the protection of 504 circuit breaker of the 220kV F transformer substation is computed, the impedance circuits of wire F-c, F-b, (F-d), (F-e), and F-A should be tested. Through analyzing the theoretical value of line impedance, a conclusion can be drawn: when 220kV A and 220kV F transformer substations at the power port of the circuit are computed, in order to ensure the distance and the section] of zero sequence should not stretch into the inferior transformer substation main transformer, and the wire (like wire A-b and F-c) which has the minimum impedance of positive sequence as well as zero sequence should be computed. What ' s more, to make sure the distance and the settofnzer