Asset management techniques for transformers

In a deregulated/reformed environment, the electric utilities are under constant pressure for reducing operating costs, enhancing the reliability of transmission and distribution equipments, and improving quality of power and services to the customer. Moreover, the risk involved in running the system without proper attention to assets integrity in service is quite high. Additionally, the probability of losing any equipment vital to the transmission and distribution system, such as power and distribution transformers, is increasing especially with the aging of power system's assets. Today the focus of operating the power system is changed and efforts are being directed to explore new approaches/techniques of monitoring, diagnosis, condition evaluation, maintenance, life assessment, and possibility of extending the life of existing assets. In this paper, a comprehensive illustration of the transformer asset management activities is presented. The importance of each activity together with the latest researches done in the area is highlighted.     

配电网停电管理系统的研究分析

随着配电系统设备的日益增多,设备种类也日趋繁杂,因此配电网的操作人员要在最短的时间内找出故障设备,以恢复供电是相当困难而且很费时的。为了能够准确而又快速地找出故障点,以便系统维修人员抢修,及早恢复供电,许多电力公司正在考虑为其配电网安装停电管理系统。因此研制和开发一个功能强大且可以升级的停电管理系统提到了电力行业的日程中来。针对配网停电管理系统的应用进行了深入的研究和分析。     

江苏电网大机组非计划停运分析

对江苏电网近几年大机组非计划停运情况进行了分析,通过分析比较得到了影响大机组非计划停运的主要因素,提出了降低大机组非计划停运的措施,为江苏电网并网发电机组提高可靠性提供了依据。     

Comparison of two algorithms for power system reliability calculations

In this paper, two algorithms are proposed for the computation of the static generation reliability of a power system. The loss-of-load probability (LOLP), which is the reliability index usually employed in static generation reliability evaluation, is computed by using both the capacity outage table and effective load approaches. Numerical results obtained from the study of a sample power system consisting of 44 generating units are compared in terms of the required computational time and numerical accuracy. It is found that, with the generating capacities properly rounded off, the capacity outage table method can be employed as an effective means of computing power system reliability. The effect of generation expansion planning on generation reliability is also examined.     

电网实物资产评价指标体系

规范电网实物资产管理,保持实物资产健康完整,优化实物资产配置,动态监控实物资产分布及运行状况,预测运维及技改投资规模是电网企业面临的重要课题。基于电网实物资产管理特点,结合资产全寿命周期管理理论与资产墙模型,针对资产管理策略中核心的资产评价问题,从规模结构分析、健康水平分析、利用效率分析、报废退役分析这4个维度构建电网实物资产评价指标体系。该研究结果可为持续深化资产全寿命管理,预测运维技改风险及实现电网经济、可靠运行提供参考。     

Sensitivity-based locational marginal value calculations in distribution grids

Electric utilities are experiencing a rapid growth of distributed energy resource (DER) deployment in their distribution grids. DERs can result in operational challenges in distribution grids, while at the same time can be viable assets in helping electric utilities better plan and manage grid design, operation, and planning. The DER valuation becomes an extremely important factor in this situation to ensure that DERs are fairly and accurately valued for the services they provide. This paper investigates the idea of spatiotemporal valuation of DERs and develops a sensitivity-based locational marginal value (LMV) calculation method that can be solved without the need for solving the network power flow problem. Furthermore, the impact of cost allocation to various upgrades in the system on LMV calculation is investigated, with the goal of demonstrating the fairness of the proposed LMV calculation method. The proposed model is applied to a standard test system for evaluation and validation.     

做好中压电网计划停电管理工作提高供电可靠性

文章首先对供电可靠性工作的重要性以及影响供电可靠性的主要因素进行了分析，进而阐述了中压电网计划停电工作与供电可靠性工作的紧密关系以及计划停电工作的主要功能特点；其次对目前计划停电管理工作中存在的问题进行了分析，根据实际工作经验提出了在计划停电管理工作中应遵循的主要原则以及确保这些主要原则实施的各种管理措施；最后以大连电业局计划停电管理工作为例，说明了做好计划停电管理工作可以稳步提高供电可靠性。     

Risk-Based Allocation of Distribution System Maintenance Resources

Asset management is an important activity in present day distribution system planning and operation. Utilities are constantly striving to optimize the use of resources available for maintenance while ensuring system reliability is within satisfactory limits. This paper proposes a method to allocate maintenance resources to various distribution system assets. To determine the effects of maintenance, a predictive reliability assessment tool is developed. This paper describes the model on which this tool is based. The results obtained from reliability assessment can be used along with an optimizer to allocate resources to various maintenance tasks in a distribution system.     

Fuzzy user interface: Its application to power system operation

A power system is configured from generating plants, substations, consumers and the transmission lines that tie them together. To perform inspection, maintenance and expansion of these facilities, regular and systematic outage of this system must be conducted. Moreover, the organization that manages this power system is a hierarchy that comprises various levels. To prepare a comprehensive schedule from the various outage requests submitted by the many sections, it is necessary for the engineer to investigate thousands of outage requests based on reliability of the power system, economical supply of power, and personnel safety. This paper presents a computerized support system that has been developed to support a coordinating engineer in power system outage scheduling. The user interface expressed as fuzzy expressions “Fuzzy User Interface” that comprises an operator model of the coordinating engineer based on analysis of such work performed at a dispatching center is discussed.     

电力可靠性预控管理系统的开发与应用

介绍金华电业局电力可靠性预控管理系统的开发与应用情况。该局电力生产工作以电力可靠性为中心，可靠性管理工作以目标管理和停电全过程预控为核心，将电力可靠性的事后统计分析管理转变为事前制定、事中控制、事后统计分析的信息化网络管理，提升了电力可靠性管理工作的管理水平和工作效率，提高了企业的经济效益和社会效益。     

配电网络可视化管理系统建设

阐述了供电企业建设配电网络可视化管理系统的必要性,介绍了某供电局基于Microsoft Office Visio和SQL Server等软件技术的配电网络可视化管理系统的设计方案,其硬件由服务器、绘图客户端、查图客户端等组成,软件采用客户-服务器体系结构,在规范化的馈线可视化管理平台上建立配电网运行与检修管理、操作票和工作票管理、资产管理、调度管理、电力通信管理等专业应用系统,指出在系统建设过程中,统一规划、分步实施、功能实用、数据准确与完整是关键.该系统在某供电局配营部实施,提高了工作效率,实现了配电网的规范化管理.     

An integrated resource planning model for utilities with quantified outage costs

Integrated resource planning (IRP) for electric utilities involves management planning of supply as well as demand at the same time. In this paper, we develop a mixed integer linear programming model for IRP. The two key distinctions of this model are the incorporation of the forced outage cost and the inclusion of power deficit/surplus. The forced outage cost will more accurately reflect the true cost to a utility, and the power deficit/surplus features will more accurately represent the existence of power deficit/surplus in utilities nowadays. A comprehensive numerical example is provided for illustrative purposes.     

山东电力物资集约化的实施

物资集约化管理是企业整合优势资源,进行机制改革的必然趋势,是对现有管理模式的变革和创新,是转变公司发展方式的必由之路。文章详细介绍了山东电力物资集约化的实施方法和步骤,山东电力在数据标准化的基础上建立全公司统一的物资主数据管理体系,通过主数据统一和物资集约化接口开发2个阶段成功实施物资集约化项目,提高了山东电力ERP的实用性和物资管理的水平。在电力行业物资信息化推进时期具有典型的示范意义。     

广东南海电网10kV配电系统可靠性分析

文章从配电系统可靠性概念入手,重点分析了影响配电系统可靠性的各种因素,指出影响配电系统可靠性的因素主要有发生频度、停电规模、故障探查排除与修复、预安排停电等4个方面。结合广东南海供电局10kV配电系统的实际情况,详细阐述了配电系统可靠性在配电网规划、建设、改造、运行中的应用。     

基于物联网技术的电力工程资产全周期管理

立足电力系统投资型工程项目管理、设备管理、资产管理现状,结合相关业务信息化建设实际情况,分析典型项目规划计划、物资采购、工程建设、运行维护、退役报废5个阶段周期性特点。通过物联网芯片编码研究,贯通资产各阶段的项目编码、WBS编码、物料编码、设备编码、资产编码等各类专业编码,解决前端项目物资信息难以与后端设备、资产信息追溯及共享的问题,提高业务处理时效性,实现资产在全周期管理各阶段全流程贯通,提升企业资产精益化管理水平。     

一种优化可靠性与经济性的变压器检修决策方法

为了在制定变压器预防性检修周期时考虑变压器自身可靠性的变化,提出了一种优化可靠性与经济性的变压器检修决策方法。利用二参数威布尔分布描述变压器的故障率及可靠度变化规律,通过役龄回退因子建立考虑预防性检修的故障率函数和可靠度函数,以变压器平均剩余无故障工作时间为检修计划期,以检修计划期内的预防性检修费用、故障检修费用和停电损失之和最小为目标函数,建立了变压器检修周期优化模型。通过对变压器内部部件故障模式的定性定量分析,计算变压器部件检修优先度,确定变压器部件检修方式。算例分析验证了该方法的可行性。     

县级配电网自动化设计方案分析

结合内蒙古电力公司“十二五”县城电网规划,以内蒙古某县为例,提出一种适用于县级配电自动化的实用建设规划方案:馈线自动化和配电监控管理小系统相结合的模式.该模式通过快速故障定位,自动进行故障隔离和恢复对健全区域的供电以及监测配电网运行状况,实现缩短停电时间,提高供电可靠性的目的,有助于提升电网的运行管理水平,实现县级配电网的科学管理.     

Asset aspirations [utilities risk management]

The need to manage assets effectively is one of the hottest topics currently occupying UK regulator Ofgem and the utilities. As ever, the core question is how to strike the right balance between the reliability and quality of supply, and the cost of capital and revenue expenditure. The principle of a move from asset management based on age to asset management based on condition is already widely accepted. In addition, industry players are increasingly accepting that risk as a function of probability and consequences of asset failure must be factored into asset management regimes. One approach, condition-based risk management process (CBRM), has been developed to help electricity companies manage their ageing assets in an environment of ever more demanding regulation.     

An IEEE survey of US and Canadian overhead transmission outages at230 kV and above

The Working Group on Statistics of Line Outages was formed in 1981 to develop, implement and summarize the results of a survey of design characteristics with overhead transmission at voltages of 230 kV and above. The survey, distributed in July, 1985, requested the voluntary submission of specific data on overhead lines in service within the period, 1965-1985. The purposes of the effort were twofold: to update earlier surveys (1949 and 1965), and to address a growing need for line outage data to support evolving probabilistic system models for planning and operation. Data were submitted by utilities from all nine NERC/USA reliability regions and by the Canadian Electric Association representing all of Canada. The outage data were pooled and analyzed to produce average statistics which are summarized in this paper     

中国与美国发电机组可靠性指标对比分析

不同国家在发电机组的可靠性指标及统计数据分析方面存在一定的差异,这对发电机组可靠性技术交流造成障碍。基于此,首先从中、美两国发电机组可靠性术语定义和指标计算公式两方面比较两国发电机组的可靠性评价方法;再从运行系数、等效可用系数、等效强迫停运率以及非计划停运次数等方面对两国各类型机组在2006-2010年的可靠性指标数据进行对比,分析两国发电机组可靠性管理和统计数据存在差异的根本原因。通过差异原因分析,促进我国电源侧规划建设和电网运行管理水平。