分析了变电站直流系统绝缘故障的危害和防范措施.首先,对某地市级供电公司近3年内发生的直流系统绝缘故障进行了统计分析,总结造成变电站直流系统绝缘故障的原因主要为直流支路二次电缆、辅助接点的绝缘老化破损和进水受潮.其次,以变电站发生的直流绝缘故障事件为例开展分析,剖析暴露的问题.最后针对各类故障原因提出相应的防范治理措施,提升变电站运行可靠性.

This paper analyzes a 220kV main and auxiliary bus Ⅱ section bus trip accident in a 500kV substation.Through the inspection of primary equipment and secondary equipment, combined with the on-site processing conditions such as the inspection of the knife switch body, the test opening and closing inspection, and the inspection of the state of the switch, the opening principle of the accident knife switch is studied.It was found that the cause of the accident was the jamming of the transmission parts and the contamination between the dynamic and static contacts, which caused the failure of the switch to open.In addition, the position of the switch is wrongly judged, and the dynamic and static contacts of the main bus switch are in virtual connection, causing arc discharge and tripping of the bus differential protection action.In response to such accidents, this paper proposes to carry out the 220kV busbar reconstruction project to realize the optimization and reinforcement of local grids and other follow-up measures.In order to solve the problem of unstable grid structure after connecting to multiple substations in the same section of 220kV busbar of similar 500kV substation, improve the reliability of power supply and ensure the stable operation of the power grid.

本文针对某220kV变电站对开关开展机械特性试验时断路器合闸时间超标的异常事件进行分析与总结.介绍异常事件发生经过,通过现场试验分析,结合变电站3AQ型断路器的合闸数据及三相极柱解体情况,初步确定此次异常事件是由灭弧室内分闸位置弧触指与分闸位置静触头导电杆摩擦力过大引起的.为保证变电站运行的稳定性,避免此类事件的再次发生,本文对220kV变电站开关合闸异常事件的处理相关措施进行了相应总结.

分析了一起腐蚀导致隔离开关触头烧蚀的事件.220 kV某甲线C相合闸不到位,由于三相连杆耐腐蚀性能不足,出现传动卡滞情况,由此产生的发热在正反馈作用下逐步发展,最终导致触头烧蚀情况出现.分析了事故产生的过程,总结了发热的原因为材质和工艺的问题,拐臂、接头材质与铜套之间存在电化学腐蚀.提出了开展温升试验,分析验证导体插入深度的裕度,作为后续工作开展的依据等处理措施.

本文分析了一起某500?kv变电站主变上的电容器串联限流电抗器匝间短路的损坏事件.通过现场分析,结合一次、二次设备的历史检查数据、设备历史巡视记录和红外测温记录,根据前期该类型设备发生类似异常的原因进行事故分析总结.此次事件发生的原因不仅与设备本身老化有关还与设备在电网中的布置方式有关.本文针对此类事件分析并提出了处理和改进的措施,避免此类事件的再次发生,提高了变电站的稳定安全运行的能力.

智能机器人越来越多地运用到变电站巡视工作中.从变电站运行维护角度出发,针对导致机器人停止作业的各项因素进行分析,重点针对各类场地因素,根据变电站内机器人巡视路线的拓扑结构选择备选巡视路线,并编制算法与程序模块,设计合理的方案实施,最终实现机器人巡视作业率的提升.

由于集成化智能变电站的逐步应用推广,变电站运行的自动化水平日益提高.变电站辅助控制系统作为变电站的一部分,为变电站正常运行提供了必要的保障,其智能化水平也需要相应提高.文中针对变电站辅助系统的应用,设计了一种智能终端,通过对变电站开关量、模拟量的采集以及RS485、CAN总线的通讯实现了变电站温湿度、气体等运行状态的监控;通过开关量的输出或者RS485、CAN总线的通讯对现场空调、除湿机、灯光等设备进行控制;通过网络通讯实现信息的综合、上传及联动,实现了变电站的在线监测和可靠控制.

随着太阳能,风能等新能源接入配电网,颠覆了传统配电网单向潮流的特征,配电网的馈线保护与重构成为了实际生产中亟待解决的难题.本文结合常规馈线自动化的保护方式,提出一种智能馈线终端单元(FTU)的设计方案.从工程实现角度,提出了基于智能FTU的配电网馈线保护与重构方案,用于提高馈线保护的选择性和重合成功率,保证电网供电可靠性.

电力的广泛应用促进了电力事业的快速发展，由于电力生产的特殊性，安全管理问题必须得到高度重视。为了保障电力生产的安全性，现在的变电所多采用运维站的管理模式。本文就是在变电所安全管理的基础上，结合运维站管理模式，再次对其管理环节进行优化，以期能确保变电所的安全运行，以供参考。

At present, longitudinal differential protection is widely used in UHV transmission lines. To ensure the correct action of longitudinal differential protection, the audio-frequency interface plays such a role as the band linking the multiplexing channels and longitudinal differential protection, therefore, to improve the reliability of protective relaying the coordination of audio-frequency interface and longitudinal differential protection is analyzed in this paper. According to the on-site experience of protective relaying operation, some problems in the configuration of longitudinal differential protection and that in the coordination of audio-frequency interface and the protection are discussed.They are: the connection of protection fault detector which starts audio-frequency interface and cuts off telephone communication; the condition by which the audio-frequency interface shifts the frequency of its signal to tripping frequency; tripping of weak-or zero-in-feed lines without time-delay; and the special problem in the connection of audio-frequency interface with the protection system.The solutions are put forward accordingly.