在低压配电系统中,采用低压并联电容器装置在配变或配电线路进行集中或分散就地补偿是降低线损、提高电压质量的有效途径。目前被广泛应用的低压无功补偿装置多为同投同切,并采用交流接触器投切电容器组。 根据我们对马鞍山配电网的实测结果,城区大多存在三相负荷不平衡的现象。如采用这种同投同切的交流接触器式装置,由于三相负荷不平衡,只要一相负荷达到动作条件,接触器则动作,必然会造成接触器频繁投切;再加上投切过程中涌流大,操作过电压高,导致接触器触头烧毁严重,影响了电容器的使用寿命和装置的可靠性。 为此,介绍一种新型的低压无功补偿技术——智能分相补偿技术。该装置主要配备于系统配电变压器或大用户电力变压器上,对三相无功功率进行分相自动投切。装置采用过零触发的电子开关, In the low-voltage power distribution system, the use of low-voltage shunt capacitor device in distribution or distribution lines in the centralized or distributed compensation in place to reduce line loss and improve voltage quality is an effective way. Currently widely used low-voltage reactive power compensation devices are mostly the same cast and cut, and the use of AC contactor switching capacitor bank. According to our measured results of the distribution network in Ma On Shan, most of the city there is three-phase load imbalance phenomenon. Such as the same cast with the same contact AC contactor device, due to unbalanced three-phase load, as long as the phase load to reach the operating conditions, the contactor is the action, will inevitably cause frequent contactors cut; plus the switching process Inrush large, over-voltage operation, leading to contactors burning serious, affecting the life of the capacitor and the reliability of the device. To this end, introduced a new type of low-voltage reactive power compensation technology - intelligent phase-split compensation technology. The device is mainly equipped with system distribution transformers or large user power transformers, the three-phase reactive power split phase automatic switching. The device uses zero-crossing trigger electronic switch,