如在500kV变电所的低压35kV侧， 最大的三相对称短路电流有效值已经接近50kA。为了限制输电线路的短路电流，保护电力设备，必须安装电抗器，电抗器能够减小短路电流和使短路瞬间系统的电压保持不变。 If the low-pressure 35kV side of the 500kV substation, the maximum three-phase symmetrical short circuit current is nearly 50kA. In order to limit the short circuit current of the transmission line and protect the power equipment, the reactor must be installed. The reactor can reduce the short circuit current and keep the voltage of the short circuit instantaneous system unchanged. 在电容器回路安装阻尼电抗器(即串联电抗器)，电容器回路投入时起抑制涌流的作用。同时与电容器组一起组成谐波回路，起各次谐波的滤波作用。如在500kV变电所35kV无功补偿装置的电容器回路中，为了限制投入电容器时的涌流和抑制电力系统的高次谐波，在35kV电容器回路中必须安装阻尼电抗器，抑制3次谐波时，采用额定电压35kV，额定电感量26.2mH，额定电流350A干式空心单相户外型阻尼电抗器，它与2.52Mvar电容器对3次谐波形成谐振回路，即3次谐波滤波回路。 In the capacitor circuit, the damping reactor (or series reactor) is installed, and the capacitor circuit can control the flow when input. The harmonic circuit is composed of the capacitor bank and the harmonic filter is used. As in 35 kv, 500 kv substation capacitor circuits of reactive power compensation device, in order to limit the input capacitor flow and control the higher harmonic of power system, must be installed in the 35 kv capacitor loop damping reactor, 3 times harmonics, using 35 kv rated voltage, rated inductance 26.2 mH, rated current 350 a, single-phase outdoor dry-type air-core damping reactor is it with 2.52 Mvar capacitors of three harmonic resonance loop formation, namely 3 times harmonic filter circuits. 同样，为了抑制5次及以上高次谐波，采用了额定电压35kV，额定电感量9.2mH，额定电流382A单相户外型阻尼电抗器，它与2.52Mvar电容器对5次及以上高次谐波形成谐振回路。起到了抑制高次谐波的作用，需要说明的是，在国家标准《电抗器》GB10229-88和IEC289-88国际标准中均对阻尼电抗器的使用和技术条件作了规定。但目前国内有些部门将阻尼电抗器称为串联电抗器，严格来讲是不合适的，因为上述标准中均没有串联电抗器这个名称。 Also, in order to prevent the 5 times or more higher harmonic, the rated voltage 35 kv, rated inductance 9.2 mH, rated current 382 a single-phase outdoor damping reactor, with 2.52 Mvar capacitor for more than 5 times and formed higher harmonic resonance circuits. It is necessary to state that the use and technical conditions of damped reactor are provided in the national standard of gb10229-88 and iec289-88. But at present, some departments in China refer to the damping reactor as a series reactor, which is strictly inappropriate, because none of the above standards have a series reactor.