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Based on multi-conductor transmission lines and dipole method, a numerical method to predict the transient electromagnetic environments due to the operation of switches in air-insulated substation is proposed. After a model of busbars in a 500kV substation is set up, the transient electromagnetic field is predicted.

4提出了将多导体传输线时域有限差分法和电偶极子法相结合的空气绝缘变电站瞬态电磁环境数值预测方法,并对一座500kV变电站开关操作产生的瞬态电磁环境进行了预测计算,获得了可用于指导二次设备下放后其电磁屏蔽设计的关键数据。

Company's existing electrical products and machinery processing production capacity: Mine QBZ series of mine flameproof vacuum electromagnetic starter, QJZ series of mine Flameproof and nature of security vacuum electromagnetic starter, QJZ series of mine flameproof and intrinsically safe Vacuum-mobile electromagnetic starter, QJZ series of mine flameproof and intrinsically safe exchange of soft / straight starter, PBG1 series of high-pressure mine explosion-proof vacuum distribution equipment, KBZ series of mine flameproof vacuum Feed Switch, the coal mine explosion-proof electric drill, lighting signal integrated protection device, KJP-belt machine comprehensive protection and GCS, GGD Series高低压开关cabinet, various types of distribution boxes, large and medium-sized motors, such as launch counter.

公司现有电器产品及机械加工制作能力:矿用QBZ系列矿用隔爆型真空电磁起动器、QJZ系列矿用隔爆兼本质安全型真空电磁起动器、 QJZ系列矿用隔爆兼本质安全型手提真空电磁起动器、QJZ系列矿用隔爆兼本质安全型交流软/直起动器、PBG1系列矿用隔爆型高压真空配电装置、 KBZ系列矿用隔爆型真空馈电开关、矿用隔爆型煤电钻、照明信号综合保护装置、 KJP型皮带机综合保护器及GCS、GGD系列高低压开关柜、各类配电箱、大中型电机、启动柜等。

Based on electromagnetic emission theory and computer simulation technology, some concerned issues on electromagnetic emission technology were studied, and launching principle of rail electromagnetic gun was explored.

本文主要运用电磁发射理论和计算机模拟技术,针对电磁枪械发射技术中相关的技术问题,对导轨式电磁枪械发射原理进行探索性研究。

Supported by National Natural Science Foundation of China (No.50077006) and Natural Science Foundation of Hebei Province (No.503424), the setup method of circuit model for instrument transformer and transient electromagnetic interference to the secondary equipments through conductive coupling due to switching operations in Gas Insulated Substation are researched in this paper.

本文结合国家自然科学基金项目&变电站瞬态电磁环境的预测计算方法研究&(项目编号:50077006)和河北省自然科学基金项目&气体绝缘变电站电磁环境与电磁干扰预测计算的研究&(项目编号:503424),重点研究了气体绝缘变电站互感器高频电路模型的建立方法和开关操作通过传导耦合对二次设备的干扰问题。

Produced by VHF electromagnetic heater tubes are combined with computer technology, electromagnetic heating technology, microelectronic technology on a high-tech products, with fast heating, high thermal efficiency, energy saving 30-80% of the obvious advantages, are "Electromagnetic Pipeline heater,"the founder of the concept as well as international non-heat pipe heating technology leader

公司生产的超音频电磁管道加热器是结合计算机技术,电磁加热技术,微电子技术于一身的高科技产品,具有加热速度快,热效高,节能30—80%的明显优势,是&电磁管道加热器&这一概念的创始者,也是国际上无热源管道加热技术的领跑者

This paper discussed the electromagnetic compatible environment of vehicle including the types of wirings in vehicle and the forms of electromagnetic interfere.

本文在分析汽车电磁兼容标准和汽车电气原理的基础上,就汽车的电磁环境进行了详细的分析,包括汽车内用电设备的类型,以及电磁干扰产生的形式。

Proportional electromagnetic valve is an important element in hydraulic pressure systems.

比例电磁阀是液压系统中的一个重要控制元件。液压系统的运行特性很大程度上取决于比例电磁电磁执行器的特性。

It also becomes more difficult to model and simulate power grid. Traditional"Quasi-stationary"phase models can't be used for studying electromagnetic transient phenomena; on the other hand, the EMTP models can be used to analyze the electromagnetic transient accurately, but for the limitation of the step size, it can't be used to simulate the large network with a high speed.

这对电力系统的建模和仿真提出了更高的要求,传统的机电暂态模型由于建立在&准稳态&假设基础之上,因此不能用来仿真变化迅速的电磁暂态过程;而电磁暂态模型,虽然能准确反映电磁暂态过程,但由于仿真步长很小,仿真速度受到限制,不适合用来仿真大型电力系统。

The dynamic phasor model is based on the time-varying phasor, which not only breaks the quasi-stationary assumption, but also overcomes the maximum step size constraint of regular transmission line, so it can be used to analyze the fast electromagnetic transient phenomena at a higher speed.

传统的机电暂态模型由于建立在&准稳态&假设基础之上,因此不能用来仿真变化迅速的电磁暂态过程,而电磁暂态模型,虽然能准确反映电磁暂态过程,但由于仿真步长很小,仿真速度受到限制,不适合用来仿真大型电力系统。

At the beginning of the thesis, the structure of usually used radome is introduced and the parameters of electromagntic characters are described in Chapter Ⅰ; the different methods for analysis of the electromagnetic characters of radome are summarized in Chapter Ⅱ; the propagation of 3-D beam in free space is conducted in Chapter Ⅲ; then in Chapter Ⅳ, the 3-D Complex Ray Theory are analyzed and the characters of transmitted field of sum and difference beams through radome are studied, and the relative formulations of calculation are rekened; at last the electromagnetic characters of the ellipsoidal sandwich radome and the plane single-layered radome are discussed, and suggestions for optimization of electromagnetic properties of radome are given.

本文第一章介绍了常用雷达罩的结构和描述雷达罩电磁特性的参量,第二章概述了目前分析雷达罩电磁特性所采用的各种方法,第三章分析了三维波束在自由空间传输特性,第四章研究了三维复射线理论,并应用它分析了单脉冲和差波束穿过雷达罩透射场的特性,导出了有关计算公式,在第五章,通过大量的数值计算和实验研究,讨论了椭球形三层夹心状实用雷达罩和单层介质平板模拟雷达罩的电磁特性,并提供了雷达罩电气特性优化的建议。

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