1) heavy pollution
重污秽
1.
Given such problems as high altitude and heavy pollution,1 000 kV voltage to UHVAV is suitable.
考虑到高海拔、重污秽等特殊问题,1 000kV作为我国特高压交流输电电压等级是比较合理的选择。
2.
Compared with other countries, UHV power transmission in China is faced with some special problems, such as high altitude and heavy pollution etc.
与其他国家相比,我国特高压输电面临一些特殊问题,如高海拔和重污秽等。
2) heavy pollution
严重污秽
3) heavily polluted evironment
严重污秽的环境
4) pollution
[英][pə'lu:ʃn] [美][pə'luʃən]
污秽
1.
Research and application of detecting pollution based on microwave spectrum s performance;
微波波谱特性在污秽检测中的应用研究
2.
The Measurement of Pollution Equivalent Salt Density and Factors Affecting Its Accuracy;
污秽等值盐密的测量及影响其准确度的因素
3.
On the basis of data and anti-pollution technology knowledge,lots of technology research results,such as the correction of SPS,the correction of NSDD and so on should be considered in 800kV UHVDC transmission line external insulation design and arrangement.
针对污秽外绝缘设计是±800kV直流工程关键技术问题之一,提出了对±800kV直流输电线路绝缘子串进行污秽外绝缘设计考虑现场污秽度校正、NSDD校正及采用污耐压方法进行污秽外绝缘设计的方法;根据瓷、玻璃绝缘子的污耐压曲线对±800kV直流输电线路"I"型绝缘子串进行了污秽外绝缘设计。
5) contamination
[英][kən,tæmi'neiʃən] [美][kən,tæmə'neʃən]
污秽
1.
Antenna temperature model of insulators contamination detected by radiometer;
辐射计检测绝缘子污秽的天线温度模型
2.
An on-line remote-monitoring system of insulator contamination based on GSM SMS;
基于GSM SMS的绝缘子污秽在线遥测系统
3.
An online monitoring system of insulator contamination;
绝缘子污秽在线监测技术与系统构成
6) contamination condition
污秽状态
1.
Time domain characteristics of leakage current of insulators have been used to forecast contamination condition,but abundant forecast information in frequency components of leakage current has still been ignored.
针对现有染污绝缘子在线检测系统基于泄漏电流时域特征预测绝缘子污秽状态,而忽略了泄漏电流频域成分中含有丰富信息量的问题,提出了利用快速傅里叶变换(FFT)与功率谱估计相结合的分析方法,提取出泄漏电流的2个频谱特征量:3次谐波与基波幅值比κ和功率谱中高频能量与总能量之比α,作为污秽状态预测参量。
补充资料:污秽表面放电
污秽表面放电 pollution surface discharge 介质表面沾染污秽时所引起的沿面放电。简称污闪。固体介质表面沾染污秽又同时变潮后,污秽层中所含的可溶性盐类和酸、碱等溶于水膜,形成离子电导,使污秽表面通过较大泄漏电流;沿面闪络电压显著降低,严重时能降低到清洁表面闪络电压的10%以下。雾、露、细雨和溶雪天气时,绝缘子甚至会在工作电压下闪络,严重影响电力系统的安全运行。因此,污闪已成为高压和超高压电工设备选择外绝缘水平的主要依据。防止污闪和提高污闪电压的措施有:①定期清扫和用水冲洗绝缘子和绝缘套管。②改进绝缘子结构使刮风、下雨时能自行清扫。③增大泄漏距离,选取合理的泄漏比矩(每千伏工作线电压需要的泄漏距离)。④给绝缘表面上半导体釉或涂硅油等憎水材料。⑤尽量使高压输电线路避开污秽区,避免在污秽区建高压变电所。
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