排序方式： 共有7条查询结果，搜索用时 140 毫秒
1
1.
This paper presents a new type of fault current limiter(FCL) based on fast-closing switch,which is composed of a capacitor bank and a reactor in series.The main control component is a fast-closing switch connected in parallel with the capactitors,which is drien by the electromagnetic repulsion force.It can response the order within 1 ms.When fault occurs,the switch closes and the capacitors are bypassed.and the fault current is limited by the reactor,Simulation analysis and experiment show that the electromagnetic repulsion force actuator can meet the demand of fast-closing switch,it is feasible to develop the FCL with low cost and high reliability. 相似文献
2.
一体化电子式电流电压互感器研究 总被引：7，自引：1，他引：7
A high-performance current and voltage measurement system has been developed in power system.The system is composed of two parts:one current measurement element and one voltage measurement element.A Rogowski coil and a capacitive voltage divider are used respectively for the line current and voltage measurements.Active electronic components are used to modulate signal,and power supply for these components is drawn from power line via an auxiliary current transformer,Measurement signal is transmitted y optical fibers,which is resistant to electromagnetic induction and noise,With careful design and the use of digital signal processing technology,the whole system can meet 0.5% accuracy for metering and provides large dynamic range coupled with good accuracy for protective relaying use. 相似文献
3.
创新是研究生培养工作的动力和保证 总被引：6，自引：2，他引：6
作者介绍了大连理工大学研究生教育创新的经验和特色,并认为教育创新首先是管理 体制创新,其次是制度创新,它是研究生工作的动力和培养质量的保证。 相似文献
4.
A new type of fault current limiter (FCL) based on triggered vacuum switch (TVS) is proposed in this paper. The TVS-based
FCL (TFCL) is mainly composed of a capacitor, a current-limiting reactor connected with a capacitor in series and a TVS connected
with a capacitor in parallel. With the TVS at off or on state, the whole TFCL behaves as a conventional series compensator
or a fault current limiter, respectively. Numerical simulation and prototype experiment based on LC resonant test circuit
show that it is feasible to develop TFCL.
Supported by the Foundation of Chen-guang Project of the Wuhan Municipal Commission of Education 相似文献
5.
6.
文章的调查表明,授予同等学力人员硕士学位质量能够满足学位的基本要求,不同相关群体对其质量的总体评价是肯定的;学员的学习过程对其知识水平、业务能力的提高有很大帮助,学员取得学位后也具有一定的学术和职业发展潜力;大部分同等学力学员的知识水平和工作能力与全日制硕士生相当;授予同等学力人员硕士学位管理工作各个环节的要求总体上是... 相似文献
7.
This paper describes a prototype power delivery system developed for high voltage electronic current transformer (ECT) that uses laser light to transfer power to and communicates with the primary converter. The design is based on optical-to-electrical power converters, solid-state diode lasers and optical fibers. Command signals are transmitted via the same up-fiber used to send power from secondary power supply to primary converter. The upward data transmission is completed during the brief interruption of power delivery without affecting steady power-supply. A simple comparator added to the primary converter can take the command data. Experimental results show that the fibers can provide reliable up-link for data transmission at 200 kb/s from the secondary to the primary converter. Based on the delivery system, the secondary converter can control three auxiliary channels to provide additional information. These monitoring channels are used in a time-multiplexing mode to provide information about the operation temperature, voltage and current at the remote unit for monitoring the ECT. This preventive maintenance or built-in test can increase reliability by giving early warning for necessary maintenance request. 相似文献
1