由于谐振接地方式可以大大提高电网的供电可靠性，因此，这种接地方式在我国配电网中被普遍采用，但随着我国电网规模的不断扩大，电力系统的运行方式的也随之变化，导致传统的消弧线圈无法实现对接地电容电流的实时测量和自动补偿了，使得对接地电流的补偿效果很差，不能消除接地点产生的电弧，不能适应电网配电自动化的要求。为此，迫切需要一种能够自动补偿接地电容电流的自动调谐装置。本文以调容式自动消弧补偿装置为研究对象，对自动跟踪消弧补偿的原理及关键技术问题进行了研究。 首先对电力系统运行方式进行了分析，得出小电流接地系统中性点谐振接地运行方式与不接地运行方式在正常与单向接地故障情况下的各种变量，分析了调容式消弧线圈补偿接地电容电流的原理及其补偿特性，针对本实验环境提出了消弧线圈、电容调节柜、Z型变压器等容量的配置方案。其次分析了装置控制系统的工作原理，介绍了在线实时测量电容电流的各种方法并详细介绍了本装置选取的方法，依据控制原理设计了基于TMS320F2812的DSP与51单片机的双CPU的自动消弧补偿装置。 最后根据试验已经选取的2.2kVA／220V的调容式消弧线圈以及基于TSC技术的双向可控硅投切电容器的2kVar的电容调节柜，配合实验室现有的条件，设计了调容式自动消弧补偿装置，并在实验室进行实验验证。试验结果表明，晶闸管投切电容器回路的设计合理，投切速度快、冲击小；由于实验中调容式消弧线圈理论计算的等效感抗与实际额定电压运行时产生感抗大小往往有一定的差别，所以消弧线圈补偿电流的理论值与实际值存在一定误差，只要将误差值补偿到理论值中，保证装置在单相接地故障时能快速、准确的选出合适档位投入电网，以达到对电网电容电流理想补偿的效果。

Resonant grounded system can greatly enhance the security and reliability of the power networks, therefore in China, it is commonly adopted in power distribution network. But with the expansion of the network scales, the means of operating modes of the power systems has also changed step by step. Moreover, because the manually traditional regulation of arc suppression coil (ASC) has been unable to follow the variation of earth capacitive current, it cannot ensure the result of grounding current. And at the same time, it also does not eliminate the arc, which is produced from the ground points, needless to say, to accommodate the power distribution automation requirements. Under this circumstance, the automatic tuning device with automatic compensation is required to be widely employed. The working principles and key problems of the auto-turning ASC, which is based on the automatic compensating earth capacitive current for arc suppression device, are analyzed in details. Firstly, the means of operating modes of the power systems and the principles of compensating arc suppression coil grounding current and capacitance with compensating characteristic are analyzed. And it also introduces various variables of resonant grounded and ungrounded ways of neutral points in the case of the normal and single-phase-to-earth fault in neutral point ineffectively grounded power system. According to the actual situation, a new method is put forward that involves the capacities like the Peterson coil, capacitors, the type of Z-transformer and so on. Secondly, it elaborates the principles of controlled system, introducing the methods which is the automatic measurement of capacitive current and the selection of such an equipment. Following this theory, the arc elimination and compensation device is designed on the basis of dual CPUs with TMS320F2812 DSP (Digital Signal Processor) and AT89C51 single-chip. Finally, arc elimination and suppression device with switched capacitors is designed based on the practice case of ASC of 220V, 2kVar of arc suppression coils and 2kVar capacitors with the two-way thruster switched capacitor (TSC) technique. After the completion of this device, adding to the existing conditions of the lab, it is tested in the lab. And the test results shows that the design of capacitors is reasonable and the process of switching capacitors is rapid and surge less; and it also proves that there still remains errors between the theoretical value and actual one. Therefore, as long as these errors are entered into the software’s promptly, the compensation of the capacitance current can achieve an effect of the ideal compensation automatic.