低压电网剩余电流保护器状态评价的研究

发布时间：2019-03-30 16:34

【摘要】：剩余电流保护器已在低压配电网全面推广应用,但是由于其质量、安装及环境、管理困难等各方面因素,剩余电流保护器拒动、误动还是经常发生。因此电力企业提出建设剩余电流智能巡检系统,以加强对剩余电流保护器监管力度,确保剩余电流保护器的可靠运行。智能巡检系统一般由便携式剩余电流保护器测试仪、剩余电流保护器后台管理数据库等模块构成。现场测试仪器识别剩余电流保护器的编号并且在线测量剩余电流保护器的动作特性参数,测试数据自动存储并远传至后台数据库,测试数据为剩余电流保护器运行状态评价提供重要依据。目前电力系统广泛开展电气设备状态维修的管理模式,本文针对配电网剩余电流保护器的运行状态评价方法进行深入研究,对剩余电流保护器运行状态进行评价并用于智能巡检系统。实现剩余电流保护器状态评价和预警,对于确保剩余电流保护器安全可靠运行,提高供电可靠性和安全用电具有重要意义。本文首先分析各类剩余电流保护器的结构原理,三级剩余电流保护配置模式,不同接地系统中剩余电流保护器的接线方式,以及各种故障模式机理及产生的原因。在此基础上,确定表征剩余电流保护器运行状态的各个指标,包括动作电流、动作时间、试跳情况、环境气候等。为了使求取的指标权重更加贴近剩余电流保护器真实的运行状态,本文采用模糊层次分析法搭建层次分析评价体系,对各种状态信息量进行两两分析比较,求得各个底层指标元素的权重。最后提出了基于模糊综合评价的剩余电流保护器综合评价方法,该方法综合考虑反映剩余电流保护器运行状态的各种状态信息,并建立合理的评价集,然后通过专家、工作人员等统筹状态评价中主、客观因素为每个指标进行打分,再利用指派法确定每个评价集的隶属度,然后根据最大隶属度原则评价剩余电流保护器最终的状态。最后,应用案例表明该方法能有效评价剩余电流保护器的状态。
[Abstract]:The residual current protector has been widely used in the low voltage distribution network. However, due to its quality, installation and environment, management difficulties and other factors, the residual current protector has refused to operate, and misoperation is still a frequent occurrence. In order to strengthen the supervision of the residual current protector and ensure the reliable operation of the residual current protector, the intelligent inspection system of the residual current is put forward by the electric power enterprise to strengthen the supervision of the residual current protector. Intelligent inspection system is usually composed of portable residual current protector tester, background management database of residual current protector and so on. The field testing instrument identifies the number of the residual current protector and on-line measures the operating characteristic parameters of the residual current protector, and automatically stores and transmits the test data to the background database. The test data provides an important basis for the evaluation of the operation state of the residual current protector. At present, the management mode of state-of-the-art maintenance of electrical equipment is widely carried out in power system. In this paper, the evaluation method of operating state of residual current protector in distribution network is studied deeply. The operating state of the residual current protector is evaluated and used in the intelligent inspection system. It is of great significance for ensuring the safe and reliable operation of the residual current protector and improving the reliability of power supply and safe use of electricity to realize the evaluation and early warning of the status of the residual current protector. This paper first analyzes the structure principle of all kinds of residual current protectors, the configuration mode of three-stage residual current protection, the connection mode of residual current protectors in different grounding systems, and the mechanism and causes of various fault modes. On the basis of this, each index of the operating state of the residual current protector is determined, including the operation current, the operation time, the trial jump condition, the environment climate and so on. In order to make the index weight more close to the real operation state of the residual current protector, this paper uses the fuzzy analytic hierarchy process (AHP) to set up the AHP evaluation system, and makes a pairwise analysis and comparison of the information quantity of various states. The weights of each underlying index element are obtained. Finally, a comprehensive evaluation method of residual current protector based on fuzzy comprehensive evaluation is proposed. The method considers all kinds of state information which reflect the operating state of residual current protector, and establishes a reasonable evaluation set, and then passes the experts, and then gives a comprehensive evaluation method of residual current protector based on fuzzy comprehensive evaluation. According to the principle of maximum membership degree, the final state of the residual current protector is evaluated according to the principle of maximum membership degree, then the membership degree of each evaluation set is determined by the assignment method, and the subjective and objective factors are graded for each index in the evaluation of the overall state of the staff and so on. Finally, the application case shows that the method can effectively evaluate the state of the residual current protector.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM774

【共引文献】