不同绝缘类型电缆的试验方法研究

现行的电缆线路电气试验方法有多种,不同电压等级、不同类型的电力电缆有不同的试验方法.文中介绍了油浸纸绝缘电缆、塑料绝缘电缆和交联聚乙烯电缆的试验方法.     

我国高压XLPE绝缘电缆线路的竣工试验

本文详细分析及论述了挤包绝缘电缆（主要为交联聚乙烯绝缘电缆）线路的竣工试验采用直流电压试验不能有效地检出有缺陷的电缆主绝缘及附件绝缘。对可能取代直流电压试验的几种竣工试验方法研究探索情况作了适用性的分析介绍。说明交流电压试验是目前相对比较有效且不会损伤挤包绝缘电缆线路电缆主绝缘及附件绝缘的竣工试验方法。最后对我国高压交联聚乙烯绝缘电缆线路的竣工试验方法及要求提出建议。     

配电电缆试验方法的研究现状和发展趋势

配电电缆是电网设备的重要组成部分,其绝缘缺陷引发局部放电、整体绝缘老化是导致电缆故障的主要原因。为预防电缆故障、保证配网安全可靠运行,研究配电电缆试验方法具有重要意义。文中总结国内外现行试验标准;阐述配电电缆各种试验方法的原理和试验规程,包括工频电压试验、串联谐振电压试验、振荡波电压试验、超低频正弦波电压试验、超低频余弦方波电压试验;重点综述振荡波和超低频电压试验方法的研究现状和存在问题,讨论电缆局放特性;最后总结上述试验方法的优缺点,探讨其在配电电缆绝缘状态诊断应用的主要发展趋势。     

电缆电弧故障仿真及试验研究

电缆电弧故障的仿真和试验对研究有效、可靠的电弧故障检测方法有重要作用。首先对现有的电弧故障模型和特点进行了介绍,根据电缆物理结构特征,提出了适用于电缆电弧故障的仿真分析模型,并介绍了在PSCAD/EMTDC中的实现方法。同时,搭建电缆电弧故障物理试验平台,对电缆电弧故障进行了试验研究,总结了电缆电弧故障的特征,为研究电缆电弧故障检测方法奠定了重要理论和试验基础。     

浅谈耐火电缆

主要介绍了耐火电缆的定义,耐火材料分类及性能,耐火电缆的耐压等级,探讨了耐火电缆的生产工艺,耐火电缆的试验方法及试验原理和新老标准的试验差异,介绍了耐火电缆的国家标准。     

直流电缆绝缘和试验方法上的问题

一、绪言在直流输电线路上实际使用的直流电缆(以下称DC电缆),其数量远远比交流电缆(以下称AC电缆)少。DC电缆的试验方法还未确立,由CIGRE的SC-21推荐的试验方法是现有唯一的试验法。DC电缆与AC电缆不同,绝缘中的电位分布由绝缘电阻决定,     

220kV较长距离电缆的交接试验

根据电缆交接试验规范规定和施工现场的实际情况,结合220kV某牵引变电站电缆线路工程,详细介绍了对于电缆距离较长、交叉互联段较多的220kV电缆交接试验的试验项目时间的安排、试验安全措施、试验仪器设备的选择及试验方法的制定。     

电缆中间接头应力锥安装错位检测的试验研究

模拟制作了电缆中间接头应力锥安装错位缺陷,以此建立缺陷检测的试验平台,对比分析阻尼振荡波电压法局部放电检测、工频交流耐压试验和局部放电在线检测等典型试验方法对电缆应力锥错位缺陷检测的有效性和灵敏度。试验结果表明:三种试验方法均可有效检测电缆应力锥错位缺陷,其中阻尼振荡波电压法的灵敏度更高且可实现精确定位。由此得出结论:可采用阻尼振荡波电压法局部放电检测和工频交流耐压试验进行10 kV电缆交接验收试验,将电缆绝缘状态检测关口前移;可采用局部放电在线检测方法检查在运电缆的绝缘状态。     

交联电缆耐压试验方法的探讨

通过对交联聚乙烯电缆绝缘特性的介绍,分析了直流耐压试验对交联聚乙烯电缆绝缘性能的影响,阐述了高压电缆用交流耐压试验取代直流耐压的必要性及迫切性,同时对交联电缆耐压试验方法进行了探讨。     

中压交联电缆的交接、预防性试验

阐述了中压交联电缆交接预防性试验的有关问题 ,提出了 (6～ 10 )、35 k V交联电缆不同的试验方法 ,介绍了单芯交联电缆铜屏蔽层的试验     

电缆纵向水密封性能检测技术研究

介绍了舰船用电缆纵向水密封性能检测技术的研究,为我国舰船用纵向水密封电缆产品的研究开发和应用提供了检测方法。     

Measurements of electrical resistances and investigations of factors affecting corrosion and breakages of shielding layers in extruded three-layer 6.6 kV XLPE cables

Corrosion and breakages of shielding layers are one of the factors for degradation of extruded three-layer (E-E type) 6.6 kV cross-linked polyethylene (XLPE) cables. Tohoku Electric Power Network has been measuring electrical resistances of shielding layers in E-E type 6.6 kV XLPE cables, and recently has found breakages of shielding layers. The authors performed an accelerated degradation test for shielding layers of E-E type 6.6 kV XLPE cables by taking account of aqueous solution, temperature, heat cycles, bending stress, frequency of an applied voltage, and water-proof layer in the test conditions, and investigated factors affecting corrosion and breakages of shielding layers. Corrosion, cracks, and breakages were found on shielding layers in the cables without water-proof layer, but no crack was found in the cables with water-proof layer, when heat cycles were applied to the cables, and shielding layers were supplied with artificial sea water. We investigated the suppressive effect of the cables with water-proof layer on cracks and breakages of shielding layers by measuring tensile strengths of copper tapes obtained from the shielding layers of the cables with and without water-proof layers.     

用于XLPE电力电缆局放检测的宽频带电磁耦合法的研究

对用于 XL PE电力电缆局部放电检测的宽频带电磁耦合法进行了研究 ,针对带铁氧体磁芯的罗哥夫斯基线圈型电流耦合器 ,讨论了几个主要参数对其传递函数的幅频特性的影响。模拟实验和电缆局放测量表明 ,应用此电流耦合器来检测 XL PE电缆的局放是可行的     

Dielectric breakdown strength correlation with time-to-failureduring wet aging of XLPE-insulated cables

This paper reviews two sets of failure information, the GMTF (a parameter obtained from time-to-failure results) and GMBD stress (a parameter that is calculated from AC breakdown test results), and suggests a correlation. The test results were obtained from accelerated aging experiments on full-sized medium voltage cables in carefully controlled and monitored water-filled tanks. Results show that the ambient temperature AC breakdown strength for equivalently aged cables is influenced primarily by voltage stress during aging-not by the aging temperature. The AC breakdown strength on equivalently aged cables was also shown to decrease with reductions in the aging voltage at all aging temperatures     

IEC 60332-3中A类成束燃烧试验方法的探讨

目前核电站、船舶 (包括舰船和潜艇 )、地铁和煤矿等行业制定了标准 ,规定了阻燃电缆的级别必须为 A类 ,因此 A类燃烧试验又成为了成束燃烧试验中最重要的部份。本文介绍了 A类成束燃烧试验方法 ,从 IEC332 - 1(第 1版 )的一种演化到第 2、第 3版 (IEC6 0 332 - 3)的两种—— A类和 AF/R类的过程及原因 ,并对这两种试验方法和试验结果进行了较详细论述和分析 ,指出 AF/R类成束试验更为苛刻 ,要求更为严格。     

电力电缆工频电压试验设备的选择与应用

通过分析电力电缆电压试验的负载特性以及变压器式和串联谐振两种工频电压试验设备的工作原理和特点,对工频电压试验设备的选择提出建议。     

Fault arcs effects in cable bundles for space applications invacuum

A multitude of `arc tracking' tests on cables for space applications has been performed to improve the basic understanding of the phenomena responsible for the fault arc behavior. The damage in a cable bundle develops in a complex system consisting of metallic conductors, insulation materials and arc plasma. Considering the degradation effects, vacuum as one of the applied test parameters, has turned out to be an important test environment. The investigations are based on a new test method, developed to assess arc tracking properties of cables for space applications. Tests were conducted with different insulation materials at cables with different AWG at 125 V dc and nominal currents. The tests were focused on the vacuum environment, using air only for the purpose of comparison. For some cable types, vacuum has turned out to be a worst-case environmental condition with respect to fault arc effects, such as the conductor burn-off, degradation of the insulation of adjacent cables and the extension of the fault arc. This paper presents these worst case experiments in detail     

Accelerated cable life testing of EPR-insulated medium voltagedistribution cables

This paper presents results aimed at developing a reliable accelerated aging tank test for EPR-insulated cables. Aging was performed at 2 to 4 times rated voltage on load cycling to temperatures of 45°C, 60°C, 75°C, and 90°C at the conductor with water in the conductor strands and outside the cable. Results show that cable failure is more rapid at the highest electrical stress and lowest conductor load cycle temperature. Cables aged at higher temperatures and various levels of electrical stress rarely failed and retained in excess of 40% of their original breakdown strength after 1500+ days of aging. Aging performed at 90°C load cycle temperature and 4 times rated voltage with air on the outside and water at the conductor of the cable showed more rapid loss of life than with water outside. Results indicate the optimum aging conditions for EPR-insulated cables in the accelerated cable life test (ACLT) differ significantly from those previously observed for XLPE-insulated cables, and that the appropriate test methodology for EPR-insulated cables requires additional study     

The selection of the frequency range for high-voltage on-sitetesting of extruded insulation cable systems

High-voltage on-site tests of extruded insulation cables are necessary to check the quality of the installation of the system. The test voltage should simulate the stress under service conditions, and generate the same failure mechanism. With respect to an optimum design of test systems, a frequency range of 20 to 300 Hz, proposed in the latest IEC Draft for on-site testing of extruded insulation cables, seems to be reasonable. The test results on model cables can be used for real cables concerning the influence of the waveform on the breakdown voltage. The withstand voltage decreases with increasing frequency. The withstand voltage and the electrical breakdown field strength are very close together for frequencies between 20 Hz to 300 Hz. Mechanical defects, as well as water trees, reduce the breakdown voltage at 0.1 Hz more than at 20 to 300 Hz, but the absolute test voltage values are higher, and the breakdown mechanism is different compared with voltages of power frequency or adjacent frequencies. For on-site tests, frequency-tuned resonant test systems (ACRF) can be recommended because they have a very good weight-to-test power ratio, and very low power demands     

10 kV小车式开关特性试验辅助控制箱的设计

设计了一种适用于10 kV小车式开关特性试验的辅助装置及专用的配套线缆,该装置及线缆与通用的开关特性测试仪配合使用,能简化试验接线,提高试验效率、保障试验安全。