变电站站域备自投保护的研究与应用

发布时间：2018-01-21 23:54

本文关键词： 站域备自投自适应保护　出处：《华南理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：现阶段,常规配置的变电站一般采用独立的自动装置,就像站内的备自投装置和低周减载装置等。这种配置方式通过敷设专用的信号电缆,将站内自动装置相关的开关和刀闸的位置信息、将交流数据量通过专用的采集电路传至装置,由自动装置识别运行方式的变化、判定装置应采用的动作逻辑。相关开关和刀闸通过信号电缆接收到装置发出的动作逻辑实现分闸、合闸动作。在这种配置方式下,每个自动装置都需要敷设自己专用的信号采集电缆和动作输出回路电缆,导致成本较高,接线形式十分复杂。自动装置的投入和退役,以及检修工作都因为复杂的回路接线导致存在运行人员的维护工作量大和失误的风险。在变电站的运行方式发生变化时,由于传统的备自投装置采用的是继电器逻辑,容易导致装置的动作不正确。更重要的是,这种配置方式在变电站扩建或运行方式改变时,自动装置的逻辑回路、动作逻辑设定和维护非常复杂繁琐,既要修改主程序,又要拆装电缆接线,运行维护工作量很大,而且导致了电网安全运行的风险。因此,传统的自动装置配备方式不能良好地适应多变的变电站运行方式。出于上述考虑,研究并开发一种变电站站域备自投保护系统就显得非常必要。它需要实现以下功能:能够自动判断变电站的运行方式,对应建立备自投动作逻辑;具备过载联切功能,预防主变过载情况;实现协调变电站各电压等级备自投的动作逻辑等功能。本文对站域备自投保护原理进行了研究,分析了备自投动作逻辑自动建模、闭锁条件、投退机制和过负荷联切方式等内容。对站域备自投保护系统的开发过程中的工程实现进行了说明,并介绍了中山电网范围内试运行情况。站域备自投保护具有三方面优势:1.在一套系统内实现了变电站站域内各电压等级的备自投功能集成,避免了传统的一个变电站设置多套备自投装置,导致装置间信息传递不畅、动作逻辑配合困难,以及联切回路接线复杂等缺点,节省了建设投资,节约了运行维护成本。2.实现了对变电站运行方式的自动辨识,并自动建立与现有运行方式对应的备自投动作逻辑,大大提高了备自投保护对运行方式灵活变化的适应性,减少了变电站运行维护人员的工作量,降低了电网运行风险。3.通过在备自投装置内配置主变过载联切功能,具备在预判变压器过载情况下的负荷联切功能,简化了主变保护的二次回路。
[Abstract]:At the present stage, conventional substations generally use independent automatic devices, such as the standby device and low-cycle load reducer in the station. This configuration mode is by laying special signal cable. The position information of the switch and the knife gate related to the automatic device in the station is transmitted to the device through the special acquisition circuit, and the change of the operation mode is recognized by the automatic device. The action logic to be used by the judging device. The action logic of the relevant switch and the knife gate received by the device through the signal cable realizes the switch opening and closing operation. In this configuration mode. Each automatic device needs to lay its own special signal acquisition cable and action output circuit cable, which leads to high cost and complex wiring form. As well as the maintenance work because of the complex circuit wiring lead to the operation staff maintenance workload and the risk of errors. When the substation operation mode changes. Because the relay logic is used in the traditional automatic switchover device, it is easy to cause the operation of the device to be incorrect. More importantly, when the substation expansion or operation mode changes, the automatic device logic circuit. The operation logic setting and maintenance is very complicated and complicated. It is necessary to modify the main program and to disassemble and assemble the cable connection. The workload of operation and maintenance is very large, and it leads to the risk of the safe operation of the power grid. The traditional automatic device configuration mode can not adapt to the changeable substation operation mode. For the above considerations. It is very necessary to study and develop a kind of substation station backup protection system. It needs to realize the following functions: it can automatically judge the operation mode of substation and establish the logic of standby automatic operation; The utility model has the function of combined cutting of overload to prevent overload of main transformer; In this paper, the principle of automatic switching protection in substation is studied, and the automatic modeling and locking conditions of the automatic operation logic of standby are analyzed. In this paper, the mechanism of on-off and the mode of over-load combined cutting are introduced. The engineering implementation of the system in the development process is described. This paper also introduces the in-test operation of Zhongshan power network. There are three advantages in this system: 1. In one system, the function integration of each voltage level in substation is realized. It avoids the disadvantages of setting up multiple sets of standby automatic switching devices in a traditional substation, which results in poor information transmission between devices, difficulty in matching operation logic, and complex wiring of the connection circuit, and thus saves construction investment. The operation and maintenance cost is saved. 2. The automatic identification of the substation operation mode is realized, and the automatic standby operation logic corresponding to the existing operation mode is established automatically. It greatly improves the adaptability of standby protection to the flexible change of operation mode, and reduces the workload of substation operation and maintenance personnel. The operation risk of the power network is reduced .3. the secondary circuit of the main transformer protection is simplified by configuring the combined switching function of the main transformer overload in the standby automatic switching device and having the load combined cutting function under the condition of pre-judging the overload of the transformer.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM762;TM63

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