气体绝缘输电线和气体绝缘开关设备在电厂中的应用

气体绝缘输电线(GIL)适用于大容量输电,尤其适用于空间有限而对环境要求较高的场所.GIL应用于电厂的突出优点是其具有较高的输送容量和可靠性,维护工作量小和绝缘长期稳定.GIL的直埋方式、室外安装方式以及隧道安装方式在电厂中可以根据技术经济最佳化的原则来选择应用.在电厂中开关系统使用气体绝缘开关设备(GIS)以及在输电系统使用GIL能够最大限度地实现电力传输系统的可靠性,这2种技术综合应用保证了输电系统的高效率,并使全寿命周期成本达到最低.     

某大型变压器高压套管爆炸的原因分析及防范措施

某电厂2号主变压器发生高压套管爆炸的故障，通过电气试验和油色谱分析试验，并结合该变压器的历史情况，详细分析了变压器高压套管爆炸的原因，就变压器高压侧出线的特殊结构，提出了防止类似故障再次发生的措施。     

不均匀受潮油纸绝缘套管频域介电谱仿真研究

电容型高压套管作为变电站内极为重要的电力设备之一,其绝缘状态对于电力系统的安全稳定运行至关重要。套管在生产和运行过程中,可能因干燥、浸渍不充分或外部水分入侵而导致受潮,对其绝缘的可靠性带来威胁。由于套管电容芯子绝缘结构的特殊性,水分在其中通常是非均匀分布的,尤其是在外界水分侵入的情况下。本文建立了油纸绝缘双单元叠层和110kV电容型套管数值仿真模型,对其在不均匀受潮状态下的频域介电谱特性进行仿真研究。结果表明：不均匀受潮时,tanδ-f曲线呈现出明显的介质损耗峰,水分分布不均匀程度增大,损耗峰对应的频率随之增大;频域介电谱对套管厚度和末屏局部的含水量变化表现敏感,而基本不受套管轴向不均匀受潮的影响。     

10KV穿墙套管被炸事故原因分析

1　事故概况35 k V城关变电所位于该县城中心 ,现安装两台主变 ,均为 SZ7- 630 0 /35。事故发生前 ,该所供电方式为 号主变单台供电。 1 0 k V采单母分段带旁母运行方式。此时 ,主变 1 0 k V侧负荷为2 80 A左右 (注 :该主变二次额定电流为 346.4A)。2 0 0 0年 6月 1 2日中午 1 2 :0 3分 ,随着一声巨响 ,35 k V城关变电所全所失电。在事故现场 ,发现该所 号主变的 1 0 k V侧穿墙套管 B相设备线夹与导线连接处融化而烧断 ,A相穿墙套管被炸碎 ,同时 B、C两相套管瓷瓶全部被烧平 , 号主变正常 ,其电源侧 35 k V开关均未动作 ,而上一级 3…     

Partial discharge testing of gas insulated substations

A discussion of partial discharge (PD) testing of SF₆ gas insulated substations (GISs) is based on a consensus among the experts on and associated with WG K4 of the IEEE Substations Committee. Such testing is discussed in the context of type testing, factory routine testing, testing of solid dielectric spacers, and field PD testing. The latter tends to be the most problematic and hence receives the most detailed discussion     

探讨SF6气体变压器的应用

介绍了香港电灯公司使用SF6气体变压器的情况，比较了气体变压器与油变压器的优缺点，提出了使用气体变压器的必要性和可能性。     

支柱绝缘子和瓷套失效分析及超声波检测工艺方法研究

通过对支柱绝缘子及瓷套进行受力分析,指出支柱绝缘子及瓷套缺陷的产生部位及破坏机理,结合超声波检测技术,介绍了支柱绝缘子及瓷套的超声检测的重点部位和检测方法。     

Partial discharge diagnostics for gas insulated substations

A defect such as a free metallic particle or stress-raising edge on an electrode could lead to breakdown in a gas insulated substation (GIS), but may be detected by the partial discharges it generates. Of the various detection means available, most success has been achieved with either acoustic transducers to detect sound waves from the discharge, or electrical couplers to pick up the ultra-high-frequency (UHF) signals generated inside the GIS chambers. All new GIS in the UK are fitted with internal couplers for UHF monitoring, and two examples of continuous monitoring schemes on 400 kV GIS at nuclear power stations are described. Further developments, which are already well advanced, include specifying and measuring the coupler characteristics, making use of expert systems to interpret the UHF discharge data, and extending the monitoring system to include the performance of circuit breakers and other equipment     

Detection of parallel discharges in gas insulated substations

Four methods for partial discharge (PD) detection in gas-insulated substations were considered. Laboratory tests were carried out to determine the efficiency of these methods to detect defects and to discriminate among different defect types. The sensitivity of the methods is compared and the applicability of the methods in the field is discussed. In the laboratory the standard PD measuring method showed a good sensitivity to defects. In the field condition the standard PD measuring method can have a sensitivity much lower than in laboratory, due to the rather high noise level expected. In the laboratory two of the alternative PD detection methods (namely the acoustic method and electrical method including a field probe inside the GIS) have shown a sensitivity to fixed-type defect discharges, while showing less efficiency relative to the mobile particles considered in the study     

UHF defect evaluation in gas insulated equipment

Small defects in SF/sub 6/ gas-insulated substations like fixed particles (fixed to conductors or on spacer surfaces) or free moving particles can influence the insulation strength of the insulation system. To determine the risk of such defects on the insulation strength, identification of the PD source is one of the most important steps. In this paper, a method to identify defects based on statistical analysis of frequency spectra is introduced. Finally two examples of risk analysis of defects in GIS are shown.     

Motion of metallic particles in gas insulated systems

The presence of metallic contamination can seriously reduce the insulation performance of a gas insulated system (GIS). This presentation is focused on the motion of elongated particles, since these particles are considered the ones most frequently found in GIS. The aim of the work has been to learn more about the motion and thereby to suggest improvements to the models that traditionally have been used. With a good model, a more accurate calculation of the motion of a particle and, in turn, a better estimation about its severity in a system can be made     

气体绝缘开关设备中局部放电的在线监测技术

本文评述了气体绝缘开关设备（ＧＩＳ）中局部放电的各种在线监测技术的原理特点、适用范围、灵敏度及结果评价等，认为超高频法具有抗干扰能力强、能识别缺陷类型、能对局放源准确定位等优点在ＧＩＳ局部放电在线监测技术中具有很好的应用前景。     

Coupled magneto-thermal field computation in three-phase gas insulated cables

Contents A numerical procedure employing the finite element technique is developed for the computation of the coupled magnetothermal field in three-phase gas insulated cables. The finite element formulation of both the electromagnetic and temperature field problems, the iterative procedure and the effective thermal conductivity of the insulation gas needed for the solution of the problem are presented here. Calculations made with the proposed method are presented in Part 2.

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Berechnung des gekoppelten magnetisch-thermischen Feldes dreiphasiger gasisolierter KabelTeil 1: Lösungsansatz mit finiten Elementen

Übersicht Es wird ein auf der Methode der finiten Elemente basierendes numerisches Verfahren zur Berechnung des gekoppelten magnetisch-thermischen Feldes dreiphasiger gasisolierter Kabel entwickelt. Hierzu werden der Lösungsansatz mit finiten Elementen für das elektromagnetische Feld und das Temperaturfeld, das Iterationsverfahren und die zur Lösung des Problems benötigte effektive thermische Leiftähigkeit des Isoliergases angegeben. Berechnungsergebnisse mit der vorgeschlagenen Methode werden in Teil 2 vorgestellt.

     

气体绝缘金属封闭开关设备(GIS)的各种优化设计

气体绝缘金属封闭开关设备(GIS)是指全部或部分地采用气体而不采用处于大气压下的空气作为绝缘介质的金属封闭开关设备.它是将输变电站设备中的断路器、隔离开关、接地开关、避雷器、互感器、套管或电缆终端,以及母线等元件相互直接联结在一起而构成.     

气体绝缘管道电缆局部放电的超高频检测技术

该文介绍了用超高频法监测气体绝缘道电缆内部局部放电的基本原理、应用及抗干扰能力。     

充气绝缘开关装置和充气断路器的监测诊断技术

充气绝缘开关装置(GIS)及充气断路器(GCB)等充气开关设备(以下简称开关设备)的带电部份虽然处于密封状态，但其可靠性相当高，维修检查也省时省力，广泛应用于核电、火电、水电等电力网中。     

全封闭组合电器(GIS)中SF6气体水分控制

结合江门变电站220 kV全封闭组合电器（GIS）中SF6气体水分含量超标的实例,列举GIS设备中SF6气体所含水分的主要来源,并对运行中GIS设备水分含量的测试结果进行分析,提出水分含量超标时现场的处理方法和措施.