长距离电缆线路电容电流的限制措施

摘要

For the problems of long-distance cable currents such as increased power loss, reduced power factor, and disconnected switches that cannot be connected to no-load lines, the currents of the cable lines are analyzed to obtain the capacitance of the no-load and light-load lines. Excessive currents such as capacitive reactive power are the root cause of the above problems. When the no-load line capacitance current exceeds 5A, shunt reactor limits can be used on the circuit breaker side. When the no-load line capacitance current does not exceed 5A, but the light-load operation is sent back to the grid for reactive power, a shunt reactor can be installed on the high-voltage bus to limit or use the main transformer low voltage side static var generator(SVG)limit.%针对长距离电缆线路的电容电流可引起的功率损耗增加、功率因数降低、隔离开关无法关合空载线路等问题,通过对电缆线路进行潮流分析,得到了空载及轻载线路的电容电流过大以致容性无功过剩是产生上述问题根源的结论.空载线路电容电流超过5A时,可在断路器线路侧使用并联电抗器限制.空载线路电容电流不超过5A,但轻载运行向电网反送无功时,可在高压母线上安装并联电抗器限制或利用主变低压侧静止无功发生器(SVG)限制.