刍议配网自动化中分段断路器定值设定原则

本文阐述了分段断路器的定值设定原则,借此来进一步加深对分段断路器的了解,确保其在配网自动化中平稳运行。

变压器保护装置中差动保护的原理及定值设定

现武汉市各大型泵站主变压器的保护装置正在逐步实现微机化。本文以实际工作中遇到的变压器微机差动保护装置,通过对原理的分析探讨它们的具体应用,差动回路中电流的相位校正方式,差动保护动作依据和定值整定的计算方法,提出了应用中需注意的相关问题。

制造企业110kV变电站继电保护设计

继电保护系统在变电站安全稳定运行方面起到关键性作用。针对某制造企业110k V变电站工程,对其继电保护系统和安全进行研究、设计与实施。根据继电保护的设计要求计算保护定值,确定变电站继电保护的设计方案;根据短路电流的计算结果,进行变压器和馈出线继电保护设计。变电站投入运行后,继电保护系统响应时间快,保护动作准确,达到预期设计效果,具有较高的安全性和可行性。

低励修正策略对电厂侧自动电压控制子站系统的影响及其应用

低励动作导致自动电压控制(AVC)子站系统退出,影响电厂安全、经济运行。本文结合低励限制原理与低励修正依据,讨论低励修正对低励限值及自动电压控制-有功无功(AVC-PQ)定值的影响,通过分析低励修正的工程实测数据,总结合理的低励限值与AVC-PQ定值的设定策略,并通过专项试验验证其效果,在工程应用方面为电厂AVC子站系统运行优化提供有效参考。

Performance enhancement of IMC-PID controller design for stable and unstable second-order time delay processes

An IMC-PID controller was proposed for unstable second-order time delay system which shows the characteristics of inverse response(RHP zero). A plot of Ms versus λ was suggested to calculate the suitable tuning parameter λ, which provides a trade-off between performance and robustness. Six different forms of process models were selected from literature to show the applicability of the present method. Performance of controller was calculated by ITAE and total variation TV and compared with recently published tuning rules. Undesirable overshoot was removed by using a set-point weighting parameter. Robustness was tested by introducing a perturbation into the various model parameters and closed-loop results show that the designed controller is robust in the case of model uncertainty. The proposed method shows an overall better closed-loop response as compared to other recently reported methods.

高压氨泵电机与进线保护定值的选择

通过实测，正常情况下，采用热应力堵转保护，设ＩＳ为９００Ａ，ＴＳ为秒，热负荷保护取电动机额定电流１５０Ａ，是比较合理的电动机保护定值。而根据尿素装置负荷情况，设定低定值过流段起动值为３２０Ａ，时间６秒为适宜。