基于DSP的小电流接地系统故障仿真测试系统设计

Design of fault simulation test system based on DSP for small current grounding system

当前我国配电网一般采用小电流接地方式,其中性点阻抗较大,在发生接地故障时允许配电网带故障运行一段时间。但为避免长时间带故障运行损坏设备及危害周围人员的人身安全,通常需要快速故障选线。近年来配电网的故障选线已经成为研究热点,而对于配电网选线方法的原理进行测试和验证也是十分重要的研究内容。为验证选线原理的正确性和有效性,设计了基于DSP的小电流接地系统故障选线测试系统,结合首半波法对故障模拟仿真计算模块进行测试,实验结果验证了选线原理的实用性和测试系统的可行性,为配电网故障选线技术的应用提供一定参考。

At present,small current grounding system is used at China′s distribution network,and its neutral point impedance is large.When the ground fault occurs,the distribution network is allowed to operate with fault for a period of time.However,in order to avoid long-term faulty operation damage to the equipment and personal safety,aquick fault line selection is usually required.In recent years,fault line selection of distribution network has become a research hotspot.The testing and verification of the principle of distribution network line selection method is also very important research content.In order to verify the correctness and effectiveness of the line selection principle,DSP based small current grounding system fault line selection test system is designed in this paper.Combined with the first half wave method,the fault simulation calculation module is tested.The experimental results confirm the practicability of the line selection principle and the feasibility of the test system.It provides a reference for the application of fault line selection technology in distribution networks.