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1.
10KV电力配电线路复杂,输电距离长,事故隐患多。为及早排除远距离线路输电的线路故障,保障线路正常运行,提出了分布架设线路故障检测装置的方法。通过在线路上架设带通讯功能的故障检测终端,完成线路故障的检测,通过GSM传输,再由监控中心主机处理信息,确定故障所处位置,再将故障信息转发给线路管理人员,及时排除线路故障,恢复供电。 相似文献
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我国社会生产发展十分迅速,社会生产和居民生活对电力的需求急剧增加,对电力系统也提出了更高的要求。电力系统中输配电线路的安全稳定运行关系到用户电能的正常使用,因此,电力部门要对输配电线路进行定期检查,做好运行维护和故障排除工作,进而保证电网运行正常,提高用户用电质量。本文指出了电力输配电线路运行中容易产生的故障问题,从电力输配电线路运行维护和故障排除技术两方面进行了具体的探讨,旨在为各地区电力系统稳定供电提供科学的依据。 相似文献
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煤矿的生产和开采过程中,自动化机床的故障对煤炭资源的开采有着直接的影响,由此美康的自动化机床的故障排除技术的研究和发展十分重要。通过对煤矿中自动化机床故障调查、分析和诊断,查找出真实的故障原因,从而有针对性的排除自动化机床的故障,在机床的故障排除过程中,采用准确的故障分析方式十分重要。 相似文献
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本文分析了影响电力输配电线路运行的因素,提出了针对电力输配电线路运行维护的有效措施,并探讨了雷击故障排除技术、风力故障排除技术以及雨水故障排除技术等电力输配电线路故障排除技术,以期为电力输配电线路中运行维护和故障排除技术的应用提供一些参考,确保电力输配电线路的稳定运行。 相似文献
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用分类和查找这些方法可以对电气设备线路故障的产生进行介绍和说明。分析故障产生的原因需要通过故障的现象,这样对研究机床电气很有用。 相似文献
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正确的电气识图的方法可以在机床线路故障检修收到事半功倍的效果。结合实际生产及相关电路实例,针对机床故障检修过程中存在的问题,阐述了电气识图的方法、技巧及故障检修分析的思路,提高分析故障、解决故障的能力。 相似文献
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通过介绍汽车制动不良故障的排除过程,阐述故障的成因并对由汽车制动系技术状况性能所造成的故障进行拆检分析,提出了此类故障检修排除时的方法和要注意的事项. 相似文献
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单相接地故障是10kV配电线路出现得最多的故障,如果不能及时检测出,并加以排除的话,对变电设备和配电网的危害极大。现通过对10kV配电线路单线接地故障原因的分析,提出了预防和故障处理办法,并建议应用新技术新设备,减少单相接地故障的发生,确保配电网安全、经济和稳定运行。 相似文献
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电主轴是数控机床三大高新技术之一,作为数控机床核心功能部件,其国产化对我国数控机床发展有着十分重要的意义。本文介绍了电主轴主要性能参数指标,并设计基于虚拟仪器的电主轴性能测试平台,应用于生产过程中的质量控制。 相似文献
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《Journal of The Franklin Institute》2022,359(16):8950-8973
A robust model matching control scheme for input/output asynchronous sequential machines (ASMs) with intermittent actuator faults is presented in the framework of corrective control. In our problem setting, certain actuator outputs are not transmitted to the machine temporarily owing to random faults. We first present a state observer that predicts the current stable state of the machine based on the output burst and control input, as well as diagnoses actuator faults. We then address the existence condition and design procedure for an output-feedback corrective controller that matches the input/output behavior of the closed-loop system to that of a reference model against intermittent loss of actuator outputs. To demonstrate the applicability of the proposed control method, we implement a practical asynchronous digital system with the developed corrective controller on the field-programmable gate array (FPGA) circuit. Experimental verifications using the FPGA circuit are also provided. 相似文献
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对润滑油在金属切削机床的使用期限进行检测对比发现,润滑油的质量按油中金属杂质的含量确定,机床各机构的技术状况根据机构的实际状况以及油中金属杂质含量的变化作出评价。润滑油中金属杂质的含量对不同型号的机床是不一样的,它取决于注入润滑油系统的油量V和变速箱齿轮的总齿数Z。对于被测定的各种型号的机床,Z/V的比值是一定的。试验结果表明,对被试验的各型普通机床,与现行标准比较,润滑油的使用期限可增加一倍。 相似文献
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为确保机床设备能正常运行,电气维修人员必须读懂电路原理图,会分析常见的电气控制线路故障现象,掌握电路检修方法。 相似文献
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现代高档数控机床对伺服进给系统提出了高速、高精度的双重要求,采用永磁直线电机直接驱动是实现机床高速、高精度进给的必要途径之一。然而,由直线电机端部效应引起的扰动,也成为影响着机床主轴系统性能的主要因素。本文系统地分析了永磁直线同步伺服电机的静态纵向端部效应、静态横向端部效应、动态纵向端部效应和动态横向端部效应的起因、机理及对电机性能的影响。 相似文献
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《Journal of The Franklin Institute》2022,359(8):3831-3856
Aiming at early detection of faults in dynamic systems subject to external periodic disturbances, this paper proposes a new generalized proportional-integral observer (GPIO) fault detection scheme with zero-pole joint optimization and novel complex coefficient gain (CCG) of residual evaluation. The focus of the proposed scheme is to reduce the adverse impacts caused by the semi-stationary periodic disturbance whose spectrum is uneven, with most energy being at some dominant frequencies. The proposed GPIO with a complex coefficient gain is designed in a two-stage procedure. In the first stage of zero assignment and pole optimization, the additional zeros introduced by the GPIO’s integration action are allocated to near the disturbance frequency. The gain of the transfer function matrix relating from the disturbances to the fault indicator signals is minimized by pole optimization. In the second stage of designing complex coefficient gain in residual evaluation, the unique feature of rank-deficient caused by the additional zeros assigned in stage one is further exploited to cancel the disturbances in the fault indicator signals (which is also referred to as the fault detection residual in this article). It is proved that, for an arbitrary periodic disturbance with a specific spectrum, the remnant components of the disturbance in the indicator signals generated by the GPIO can cancel each other by a complex gain vector, which can be determined by the zero eigenvalue’s left eigenvector of the rank-deficient of the disturbance transfer function matrix. The sufficient conditions for the convergence of the proposed fault detection filter are also given. Numerical examples illustrate the proposed method’s better performance in detecting minor faults. 相似文献
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《Journal of The Franklin Institute》2022,359(8):3389-3404
Power systems are subject to stochastic faults and process random noise. The faults (due to e.g. lightning strokes) can be temporary or permanent. When a lightning stroke hits a transmission line, the circuit breakers open to clear the fault and reclose. The resulting parameters changes are modelled as a discrete-time Markov jumps in this paper using the practical statistical failure rates. System parameters are also subject to random noise e.g. line reactance’s depend on the conductors spacing which in turn depends on stochastic wind speeds. This paper presents a novel power system excitation control robust against such stochastic uncertainties. The design is based on a derived sufficient condition in the framework of linear matrix inequalities (LMI), and the attracting ellipsoid approach. The effectiveness of the proposed control is tested on a multi-machine power system. 相似文献
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电器安装与维修是维修电工专业必修的实训课程。包括三相异步电动机典型控制电路及其安装、调试与维修,直流电动机典型控制电路及其安装、调试与维修,常用机床控制电路的检修,电动机控制电路的设计与测绘等,其突出操作技能训练,重视对学生动手能力的培养。演示教学法可很好地将课堂教学与操作训练衔接起来。本文就演示法在电器安装与维修课程教学中的应用,就如何提高学生理论分析与实践操作能力,提高电器安装与维修教学质量和效果,促进学生综合素质提高,结合本人实际工作经验,介绍几点演示教学在实际教学中的做法。 相似文献
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《Journal of The Franklin Institute》2023,360(11):7128-7147
This paper proposes an adaptive data-driven fault-tolerant control scheme using the Koopman operator for unknown dynamics subjected to nonlinearities, time-varying loss of effectiveness, and additive actuator faults. The main objective of this method is to design a virtual actuator to hide actuator faults from the view of the system’s nominal controller without having any prior knowledge about the system’s underlying dynamics. The designed virtual actuator is placed between the faulty plant and the nominal controller of the system to keep the dynamical system’s performance consistent before and after the occurrence of actuator faults. Based on the Koopman operator theory, an equivalent Koopman predictor is first obtained using the process data only, without knowing the governing equations of the underlying dynamics. Koopman operator is an infinite-dimensional, linear operator which takes the nonlinear process data into an infinite-dimensional feature space where the dynamic data correlations have linear behavior. Next, based on the approximated system’s Koopman operator, a virtual actuator is designed and implemented without knowing the system’s nominal controller. Needless to use a separate fault detection, isolation, and identification module to perform fault-tolerant control, the current method leverages the adaptive framework to keep the system’s desired performance in facing time-varying additive and loss of effectiveness actuator faults. Finally, the approach’s efficacy is demonstrated using simulation on a two-link manipulator benchmark, and a comparison study is presented. 相似文献
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就我国中职电子信息专业而言,数字电路属于该专业最基础的课程,此外,其也被称为电子产品整机装配与维修、单片机原理和应用及集成电路等课程的必要前提。基于我国中职学生特点:思维方法单一、文化基础较弱、畏难情绪重及创新意识能力不强等。此外,作为中职执教教师,必须对学生实践能力、动手能力予以足够重视,并积极培养学生学习兴趣,其中,将实验验证教学方法应用于中职数字电路触发器教学中,是实现中职学生相关能力提高的重要途径。 相似文献