SF6 leaked from gas insulation equipment will interfere with the detection of dissolved characteristic gases in transformer oil. In order to determine the impact of SF6 on the detection of dissolved C2H4 gas in oil, a photoacoustic (PA) C2H4 detection system based on the combination of mid-infrared thermal radiation source and near-infrared laser was constructed. The excitation light from two bands was incident on a non-resonant PA cell. The thermal radiation light source and the laser light source were switched to evaluate the interference level of SF6 on the detection of C2H4. The experimental results show that SF6 has significant interference to C2H4 when using a mid-infrared thermal radiation light source. The interference coefficient is 2014%. The near-infrared laser based on PA detection method can effectively suppress the interference of SF6 on C2H4. The minimum detection limit of C2H4 reaches 0.6 ppm when the average time is 60 s.

The water vapor in the ambient air affects the accuracy of the photoacoustic (PA) dissolved gas analysis system for transformer health monitoring. A laser PA system was evaluated by dry and humidified standard gases to study the influence of water vapor concentration on PA gas detection. Theoretical analysis was conducted on the effect of gas molecule relaxation on PA signal detection. A high-frequency resonant PA cell and a low-frequency nonresonant PA cell were used to detect acetylene (C2H2) and carbon monoxide (CO), respectively. The experimental results show that the PA signal of humidified CO is about 12 times higher than PA signal of dry gas for the resonant PA detection system, respectively. In addition, as the frequency is increased from 30 to 980 Hz, the PA signals of humidified and dry CO attenuate by 1.5 and 6.9 times, respectively.

对交流输电线路对管道的暂态影响进行归纳,分为线路分合闸和故障态,前者不改变线路电路结构,后者根据电路结构的不同包括线路相线接地、断线,雷击杆塔未反击及发生反击等情况.该文理论分析暂态时输电线路对地下油气管道的电感性和电导性耦合,建立不同暂态下的线路-管道等效电路.进而实例研究暂态下海西—塔拉750kV交流输电线路乌兰段对邻近埋地天然气管道的电磁影响.线路操作时对管道的电磁影响小;线路单相接地、断线接地时,管地电位最大值分别为4.3kV和12.9kV;杆塔遭受雷击和反击时管地电位峰值分别可达18.4kV和37.2kV.反击时故障相电流产生的电感性耦合部分抵消了雷电流对管道的电导性影响.对管道采用固态去耦合器的防护措施,使瞬态电磁影响降低并抑制了其传播.研究结果可为交流输电线路和埋地金属管道共用走廊的设计提供技术参考和支持.

高海拔架空输电线路电晕产生的可听噪声相对较大,传统的检测方法常常受到较大风速和背景噪声的影响,不仅理想的测试时段受限,而且准确性也不能得到充分的保障;同时,受带电安全距离的限制,也无法通过测得电晕光子团噪声的大小来预测高海拔架空输电线路下方的噪声大小.本文提出了利用测试电晕光子数来预测高海拔架空输电线路可听噪声的新方法,该方法建立了光子数—噪声声功率级间的关系以及预测计算模型,并通过工程实例验证,等效连续A声级的预测值与实测值误差范围在-1.6～1.2 dB之内,能够满足工程需要,将为高海拔地区交流架空输电线路工程建设环境影响评价提供技术借鉴和参考.

针对750 kV青南-西宁Ⅱ回线路与涩宁兰输气管道并行走廊的情况,在3种稳态状态下(未运行、正常运行、三相不平衡运行),计算走廊内输气管道受到的电磁影响.建立管道分布参数电路中固态去耦合器排流装置和绝缘法兰的等效电路模型,研究走廊内750 kV青南-西宁Ⅱ回线路投运后,各线路正常运行时的交流干扰缓解措施的粒子群优化问题.研究可为工程实践提供技术支持.

高海拔架空输电线路电晕产生的可听噪声对环境的影响相对较大,是环境影响、设备选型重点考虑的因素.通过对青海地区某输电线路可听噪声与紫外电晕放电实地测量,并根据测量结果绘制频谱曲线图,得出高海拔交流输电线路噪声频谱特性及声级范围,在工程建设中具有一定的参考作用.

我国是一个水资源严重短缺的国家,水灾害、水污染严重影响国家的经济和环境发展.水污染治理刻不容缓,将反渗透技术处理应用在水污染处理技术中不仅能大大提升水处理效果还能使废水有效回收利用.在水处理工作上做好反渗透技术应用尤为重要.反渗透水处理技术操作简单、易于掌握、成本低廉得到人们的广泛关注.本文围绕浅析反渗透水处理技术的基本原理、反渗透水处理具体应用技术和反渗透水处理技术未来应用趋势,三个维度展开深入解析.

输电线路对输气管道的电磁影响日益突出,为研究具体影响程度,通过现场试验、仿真计算得出750kV交流在输电线路正常运行、事故运行、雷击杆塔3种系统状态时油气管道的感应电压和电流,确定输电线路对输气管道的交流腐蚀强度和输气管道对地电压,评估750 kV交流输电线路对输气管道影响程度,并提出建议防护措施.

火力发电机组中,精处理系统通过前置过滤器、高速混床等设备对凝结水进行处理,为超超临界机组锅炉用水提供保障.文章对某火电厂1号机精处理调试过程中遇到的一次高速混床漏树脂问题进行分析,并提出相应解决办法.

阐述了SF6气体分解产物校验仪的特点、校验方法,并成功应用于入网检测中,也可应用于日常校验及扩展应用.该校验技术进一步提升了带电检测工作,为及时发现SF6电气设备潜伏性故障及故障气室准确定位提供保障.