Taking the on-site burning fault of the opening and closing coil of circuit breaker as an example, the main causes of the fault and the treatment measures are analyzed in this paper. Moreover, the finite element calculation method is used to study the motion process of the electromagnet. By adjusting some parameters, the various factors affecting the performance of the electromagnet are simulated and analyzed, and the simulation results are given, which can provide a reference for the correct selection of opening and closing coil.

Abstract An AC filter tripping accident occurred in a converter station of the North China Power Grid in 2019, which seriously affected the safe and stable operation of the power grid. In this paper, combined with the configuration of the AC filter in the converter station and the principle of capacitor unbalance protection, the tripping mechanism of the AC filter is explained. It is considered that the direct cause of the tripping of the AC filter is the short-circuit discharge phenomenon between the layers caused by the dead trees (grass) branches on the capacitor tower, which causes the instantaneous fault between the layers of the low-voltage capacitor, and finally leads to the action of the capacitor unbalance protection. From the perspective of operation and maintenance, some practical preventive measures are put forward, which will help to improve the safety of AC filter operation in the future, and then improve the reliability of DC transmission system, especially during the peak summer, peak winter and special power protection period, to ensure that there will be no fluctuation in DC load transmission and protect the safe and stable operation of power grid.

This paper briefly describes the failure situation of qinghe 1 # main transformer, and according to the comprehensive data of high pressure test and oil chromatography test, the failure cause of the A phase winding is analyzed, and finally put forward the reasonable accident prevention measures, to provide reference to prevent the occurrence of similar faults in the future.

GW4-126DW disconnecting switch is a kind of switchgear commonly used in substations. When the disconnecting switch has defects or failures, it needs to be repaired. In this paper, the comparative analysis, system sorting, and summarization are used to optimize the maintenance process of the GW4-126DW disconnecting switch. After optimization, the overhaul process includes inspection before overhaul, dismantling of disconnecting switch, troubleshooting and elimination of defects, assembly and debugging, and inspection after overhaul. The research results have been applied to practice exercises for students majoring in electrical engineering. It has been proved that the maintenance process has clear logic, comprehensive operation steps and good practicality.

Taking Substation Maintenance Practical Training curriculum as an example,“Three Realities" practical training mode on the basis of the real equipment, division of labor according to real roles and carrying out real work tasks is constructed, taskbased textbooks, digital resources and curriculum ideological and political education case base are developed so as to form three-dimensional curriculum resources, the diversified evaluation mode which focuses on process evaluation is adopted, which improves the teaching quality of Substation Maintenance Practical Training curriculum.

In view of an explosion accident of 110 kV oil immersed current transformer, the current transformer was disassembled, inspected and restored, and the explosion accident caused by the disconnection of the grounding of the end screen of the current transformer was confirmed. Therefore, the corresponding treatment and preventive measures are put forward to provide technical reference for equipment manufacturers, maintenance and operation and maintenance personnel to analyze and deal with the defects of oil immersed current transformer.

The stable operation of power transformers ensures the security and reliability of power networks. Winding deformation of transformers caused by short current rush accounts for a large proportion of transformer faults. The frequency response analysis method (FRA) is comparatively widely used in the transformer winding deformation detection. But at the same time, this method is easily influenced by external factors such as detection conditions and wiring methods to lead a misdiagnosis. Based on the analysis and judgment of the FRA test data of a 220kV transformer with balanced coils, this paper proposes that it is a reasonable and feasible connection method to short the two ends of the balanced winding without grounding. It can effectively avoid the influence on the test results of the incorrect connections of the balanced winding in the future.

In order to solve the problem of fast fault diagnosis in power system, this paper introduces a method of finite state machine model of fault reasoning for distribution system under time sequence constraints. Firstly, the concept of time sequence constraint characteristics of SOE data from the SCADA alarm window is introduced, which is crucial to judge whether the alarm sequence are from an individual fault accident. Then, by fully considers the “protection-circuit breaker” action as well as its logic, the Finite State Machine model with various system fault types was constructed. Finally, to prove the effectiveness of the method, a set of alarm data in real accident which happen in 10 kV distribution systems is applied to test the model. The result shows that the model can quickly analyze SOE data within the time interval in system accident, and effectively help the operation dispatcher to handle accident and defect elimination.

A 10kV bus PT breakdown accident caused by two-phase grounded is mainly introduced in this paper. Firstly, the bus voltage variation is analyzed when two-phase grounded occurs. Then, the ferromagnetic resonance mechanism and the reason of PT magnetic saturation are introduced in neutral point ungrounded system. The function of PT primary side resonance elimination device is analyzed. At last, the management and technology problem exposed by the accident is analyzed, and the preventive measures suitable for the company are put forward in order to reduce the occurrence of such accidents.

This paper put forward a new power grid fault trace method based on big data platform. It extend the data source to transformer substation and deal with the fault date by the technology of Spark. This method can solve the problem of mass data processing. This paper analyses fault information by data mining and trace the malfunction of protection or circuit breaker by decision tree. It can give the reason of fault and optimize the function of fault diagnosis system. Compared with the traditional fault diagnosis system, which based on alarm messages, this method can use every monitoring data in substation and give the reason of fault.

此文介绍了职业培训中《太阳能发电基础》课程的开发和实施过程,首先通过需求调研确定培训内容和培训目标,然后将ATD的培训组织理念与成人学习特点相结合,开发出了以学员为主体,高参与度的培训课程,最后介绍了培训课程的实施过程.为我国的专业技术人员的职业教育和职业培训国际化提供借鉴.

“一带一路”倡议自2013年提出以来,其互信、融合、包容的全面合作内涵不断得到丰富,随着合作机制的广泛建立与完善,进入了全面实施和精耕细作阶段.与此同时,以互联互通工程施工为主,各类与能源、交通运输、有色金属、旅游、生物医药、种植紧密相关的企业大量布局“一带一路”沿线国家,而与这些企业的宏伟战略目标格格不入的是,“走出去”企业普遍缺乏国际化人才做支撑,因找不到合适的国际化人才进行有效管理,生产经营活动亏损的事件也时有发生.

此文从电网设备状态检测新技术培训工作的特点出发,分析电网设备状态检测新技术人才需求特点,分析了当前电网设备状态检测新技术人才培训中存在的问题,总结归纳得出电网设备状态检测新技术人才培训目标体系,并提出完善电网设备状态检测新技术人才培训的具体建议和措施.通过强化培训资源基础建设、创新人才培养模式和完善培训体系健全培训机制,全面提升电网设备状态检测新技术人才工作能力和水平.

This paper presents a three-dimensional (3D) interactive simulation training system based on holographic projection technology, nano-touch technology and interactive training mode, which realize the 3D display without stereoscopic glasses and touch type human computer interaction. 4 sets of holographic training courseware and 2 sets of fault presentation courseware was developed. Every courseware includes four parts: the cognition mode, the operation mode, the disassembling mode and daily maintenance mode. The system can carry out the training course of distribution automation equipment structure, disassembling and assembling, daily maintenance, operation, and the fault handling. A new training mode of power equipment training was created, which opened a new era of power equipment training.

为了充分考虑需求侧对电力资源的需求及使用效率,在含有分布式电源的配电网线路及经济效益规划中引入需求响应机制.首先分析了两类常见的分布式电源典型日效率特性曲线及两类用户的需求侧电能响应曲线,指出供需不平衡,传统方法难以实现削峰填谷的目的.为此计及价格和激励的需求响应,分析了分布式电源在电网中的约束条件,对配电网规划和电源的配置进行了研究,提出了更加合理的削峰填谷方案.

More attention is being devoted to heavy metal pollution because heavy metals can concentrate in higher animals through the food chain, harm human health and threaten the stability of the ecological environment. In this study, the effects of heavy metals (Cu, Cr, Zn, Pb, Cd, Ni and Hg) emanating from oil waste disposal on surrounding soil in Jilin Province, China, were investigated. A potential ecological risk index was used to evaluate the damage of heavy metals and concluded that the degree of potential ecological damage of heavy metals can be ranked as follows: Hg > Cd > Pb > Cu > Ni > Cr > Zn. The average value of the potential ecological harm index (Ri) is 71.93, thereby indicating light pollution. In addition, this study researched the spatial distribution of soil heavy metals by means of ArcGIS (geographic information system) spatial analysis software. The results showed that the potential ecological risk index ( R ) of the large value was close to the distance from the oil waste disposal area; it is relatively between the degree of heavy metals in soil and the distance from the waste disposal area.

此文中提出了一种基于全息投影显示技术、纳米触摸技术和互动培训模式有机结合方式的全息投影交互仿真培训系统,实现无需佩戴立体眼镜的全息课件的立体展示和触摸式人机交互,开发了4套全息教学课件和2套事故展示课件,可开展设备结构认知、设备拆装、设备维护、设备操作展示、事故发生机理及处理等培训.创建了电力培训的一种全新的培训模式,开启了电力设备新式培训的纪元.

此文从培训教学过程中的几个关键环节入手,分析了以学员为本提升培训质量的方法.通过对培训需求的深入分析,阐述了如何把握培训需求的方向,从源头上设计好培训课程.通过对学员学习特征的详细剖析,阐明了如何把握学员特点,对症下药实施培训教学.通过对学员兴趣点的具体分析,列举了如何把握培训过程,激发学员兴趣,突出授课方式的灵活多样性.同时阐述了如何把握培训质量,对学员的培训教学效果进行合理评估和有效反馈.