中国在世界上所占的能源生产和消耗的比重是最大的，而煤炭作为最早被人类利用的传统的能源，在我国能源消费结构中依然牢牢占据着非常高的份额，对于我国经济的整个产业结构里，煤炭占据了很大的比重，并且在之后的很长一段时间都会保持这一比重。煤矿的电力供应系统为矿山的生产提供了能源，生产的安全、员工的安全是最基本的两项内容。 目前，我国的煤矿供电系统供电还存在一定的局限性，分支庞大，本文根据对小庄矿的目前状况的进一步探讨，井下供电系统是一个具体分析的方面，在此基础上对越级跳闸和小电流接地选线与定位两个方面进行深入研究，提出了一种在GOOSE通信的故障定位基础上的解决方案。开始，越级跳闸的防止理论等要明确并介绍，拓扑节点的选择、越级跳闸闭锁机构和断路器拒动的鉴定也要做一个具体的分析解释。其次，接地故障判别原则和故障定位原则分别是在参数识别和GOOSE的基础上进行解释的。 本文具体阐述了系统内的硬件组成，基于PowerPC+FPGA的设计理念计划，主处理器选用 Motorola公司的MPC8313E芯片，FPGA选用Xilinx公司的XC6SLX9芯片，对于通信模块、存储器扩展模块、人机交互模块和时钟模块开关量输入/输出模块、交流采样模块、控制器、电源模块，这些系统的硬件构成模块都进行了一一阐述说明。 本文说明了系统内的软件组成，同时对防越级跳闸如何运行和手段措施以及元件判别的手段都进行了具体的解释，保护和防越级跳闸的软件实现及故障选线定位的实现方法。 该系统已在小庄矿供电系统中应用，并取得了良好的应用效果，进一步验证了系统的可行性。同时，分析了应用过程中存在的问题，并对GOOSE通信流程和短路闭锁进行了改进，使其能够更好地适应复杂的井下条件。

China's share of energy production and consumption in the world is the largest, and coal, as the earliest traditional energy source used by humans, still occupies a very high share in China's energy consumption structure, for the entire economy of China. In the industrial structure, coal accounts for a large proportion, and will maintain this proportion for a long time. The power supply system of the coal mine provides energy for the production of the mine. The safety of production and the safety of employees are the two basic contents. At present, China's coal mine power supply system still has certain limitations, and the branch is huge. According to the further discussion of the current situation of Xiaozhuang Mine, the underground power supply system is a specific analysis aspect. On this basis, the leapfrog and small In-depth study of current grounding line selection and positioning, and proposed a solution based on fault location of GOOSE communication. At the beginning, the prevention theory of the leap-level trip should be clarified and introduced. The selection of the topological node, the over-level trip blocking mechanism and the identification of the circuit breaker refusal should also be analyzed and explained. Secondly, the ground fault discrimination principle and fault location principle are explained on the basis of parameter identification and GOOSE. This article specifically describes the hardware components of the system, based on the design concept of PowerPC + FPGA, the main processor selects Motorola's MPC8313E chip, FPGA selects Xilinx's XC6SLX9 chip, for communication module, memory expansion module, human-computer interaction module and Clock module switching input/output module, AC sampling module, controller, power module, the hardware components of these systems are explained one by one. This paper explains the software components in the system. At the same time, it explains the operation of the anti-step trip and the means of component discrimination and component identification. It also protects and prevents the software implementation of the leap-level trip and the implementation method of fault line selection. The system has been applied in the power supply system of Xiaozhuang Mine and has achieved good application results, further verifying the feasibility of the system. At the same time, the problems in the application process are analyzed, and the GOOSE communication process and short-circuit blocking are improved, so that it can better adapt to complex downhole conditions.