基于DSP的井下低压供电系统选择性漏电保护的研究

Research of the Underground Selective Leakage Protection

漏电在井下环境中产生的危害大,影响范围广,因此要求漏电保护装置可靠、速动及有选择性。该文提出的总馈电开关处采用附加直流电源检测,分支开关处采用零序电流幅值和零序功率方向的融合选线方式,双重选线方式防止误判错判,总开关和分开关都采用DSP（TMS320F28335）为控制器,总分复用,提高漏电保护的可靠性、灵敏性及准确性。

The mine environment on the low voltage power grid is bad, therefore the leakage protection is put forward the requirements of reliability, quick acting and selectivity. The main switch and branch switch of this system all chooses DSP（TMS320F28335） as the controller. The total controller and the branches processor use the method of total score reuse, which means that if the total controller has something wrong, we can by selecting a branch controller as the general controller to avoid the total controller problem which caused by accidents. This method can avoid the failure of the leakage effectively. Through the design of hardware circuit and software programming method, this system can judge the leakage fault and choice the leakage branch correctly.