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针对当前井下低压电网常见电流故障的保护问题,利用时序鉴别、相敏检测等原理,采用大规模可编程逻辑器件FPGA作为控制核心,以CAN总线作为通信方式设计了一套用于识别异步电动机和三相短路电流的相敏保护方案、用于识别非对称故障的负序保护和用于单相漏电识别的漏电保护方案,并利用QUARTUSII等软件对硬件设计进行了仿真,验证了系统硬件设计的准确性与可靠性。弥补了以往保护系统的诸多不足,具有很高的应用价值。
Aiming at the protection of the common current fault in low voltage power grid at present, this paper uses the principle of timing identification and phase sensitive detection, adopts large-scale programmable logic device FPGA as the control core and CAN bus as a communication method to design a set of three- Phase-sensitive protection scheme of phase short-circuit current, negative sequence protection for identifying asymmetrical fault and leakage protection scheme for single-phase leakage identification. The software design of QUARTUSII is used to simulate the hardware design, which verifies the accuracy of system hardware design Sex and reliability. Make up for the many deficiencies of the previous protection system, with high application value.