由于长期处于封闭或半封闭状态、出入口较为狭窄,自然通风条件差,有限空间作业存在危险程度高、救援难度大的特点,因此对有限空间现场作业进行安全智能管控非常必要.以传感器监测和视频监控为手段,开展有限作业空间智能管控技术研究,实现有限空间作业环境的实时监测智能预警、作业全程可视化监控以及安全智能管控,保障作业人员和财产安全,有效预防和遏制电力系统有限空间发生安全事故.

针对目前变压器局放传感器灵敏度低、频带窄等问题,采用平面等角螺旋天线设计特高频传感器,采用直线代替指数渐变巴伦,仿真验证螺旋内径、巴伦宽度和高度对天线性能的影响,表明随着平面等角螺旋天线的螺旋内径r0的增加,回波损耗在低频段波动性逐渐变强,频带宽度降低;巴伦端宽度w1对天线回波损耗低频段的稳定性和频带宽度的影响也十分明显;巴伦高度h则主要会影响天线回波损耗高频段的性能,随着巴伦高度的增加,回波损耗呈现先增加后减小的趋势.基于天线仿真优化尺寸,研制了基于法兰安装的变压器局放特高频传感器,利用变压器局部放电模拟系统进行实测,回波损耗S11小于10 dB带宽为0.38～3 GHz,增益可达3.64 dB.结果表明传感器抗干扰能力强,天线性能良好,可用于变压器局部放电在线检测及故障诊断.

Aiming at the problems of excessive dependence on DC bias magnetoelectricity, too large size and low sensitivity of existing magnetoelectric sensors in power grid transmission lines, a flexible self-biased magnetoelectric transducer design method for current detection was proposed. The designed magnetoelectric transducer can reach a magnetoelectric voltage coefficient of 17.65V/(cm·Oe) in the zero-bias state, and has excellent magnetoelectric response performance. The current monitoring capability of the transducer is verified on the built current test platform. The results show that the sensitivity of the transducer is 33.07mV/A when the power frequency current is 50Hz, which has excellent sensitivity and linearity. The field has great application value and broad application prospects.

At present, there are great differences in the types and methods of sensing devices supporting the power grid digital twin to realize full sensing. Only relying on the point-to-point setting method to realize a large amount of interactive information between the sensor and the digital twin virtual body cannot meet the application requirements. In order to solve the above problems, a power grid digital twin data embedding method is provided. The perception information is sent to the corresponding digital twin according to the matching degree between the digital twin scene semantic attribute and the perception device scene semantic attribute, so that the corresponding digital twin can embed the perception data in the perception information into the data set corresponding to the relevant service function. It can realize the flexible adaptive mapping between the perceived information and the digital twin, ensure the automatic matching and access of various sensing devices, improve the adaptability between the perceived information and the digital twin, avoid the problem of insufficient interaction ability of virtual and real mapping caused by manual point-to-point setting, and effectively promote the development of various power application services based on the power grid digital twin

有限作业空间由于封闭、与外界隔离、出入口较为狭窄,作业人员在内工作时,存在危险程度高、救援难度大的特点,因此有限空间现场作业的安全管控及智能分析非常必要.本文以气体监测和智能图像识别为手段,通过多种环境传感监测、作业人员智能化人脸识别管理、作业环境异常分析预警等技术,开发有限作业空间安全管控系统,可实现作业环境研判、人员体征监测、作业可视化监测和环境高危预警,从而增强人员作业安全、提升管理智能化水平和作业质量与效率,完成有限空间作业现场安全监督,保障电力安全生产,最终实现规避作业过程中存在的危险、危害因素

配电网电缆运行环境复杂,当出现超负荷运行状态时,由于电流热效应及综合电流的涡旋效应、趋肤效应等因素,会造成电缆升温严重.如果长期超温运行,电缆绝缘材料会因高温影响而加速老化,引发安全隐患.为了掌握环境因素对配电网电缆导体温度趋势的影响,通过热动态平衡法分析,提出了基于修正热动态平衡法的温度预估方法,并针对辐射散热、吸收产热,对流散热对导体温度趋势的影响进行了对比仿真.根据修正热动态平衡法,进行了配电网导体温度预估的系统设计,该系统通过分布式光纤测温技术(DTS)进行电缆表面温度测量,并根据修正热平衡方程完成电缆导体温度趋势预估.