三菱新型数字式脱扣继电器

超级AE-SS系列断路器是日本三菱电机公司于90年代推出的带电子脱扣器的万能式断路器,其主回路设计采用电子计算机进行发热计算和分析,灭弧室电弧能量的处理能力也有明显提高.与老产品相比,新型超级AE-SS系列体积缩小30%,分断能力较过去提高了30%,实现了无飞弧距离,短时通电能力较过去提高了30%,机械寿命增至10000次,全系列实现了脱扣继电器部分的高功能化.     

新型静态继电器综述

综合性地介绍了数字式动作延时继电器、数字式返回延时继电器、数字式动作延时中间继电器、数字式返回延时中间继电器、无源静态电流继电器、无源静态电压继电器、静态信号继电器、静态数字重合闸继电器等的主要用途、电磁兼容性、抗干扰性能、主要特点以及同类继电器的相互代换关系。     

转换型直流固体继电器的设计

介绍了一种一组转换型直流固体继电器的原理、特点以及应用。文章提出了一种加速继电器转换的方案。合理利用光隔离和变压器隔离的组合，使切换时间控制在100μs以下。这一特点，使其在高速控制场合较其它类型继电器占有很大优势。     

自锁双稳态继电器及其应用

介绍自锁双稳态继电器基本工作原理，特性及其典型应用。     

某水电站110kV微机变压器保护动作原因分析

针对湖北某水电站 110kV微机变压器保护的动作情况进行分析 ,指出微机保护现场运行需注意的一些地方和分析不明动作原因的一些方法。     

继电器特性分析软件及对一次特殊事故的分析

继电保护装置就是能反应电力系统中电气元件发生故障或不正常运行状态,并动作于断路器跳闸或发出信号的一种自动装置。继电保护装置是完成保护功能的核心。对于保护工作人员而言,在继电保护装置发生异常动作行为时,如何利用某些工具同时结合继电保护理论对不正确动作行为进行解析,进而提出反措方案是至关重要的。继电器特性分析软件就是基于以上设想,通过计算机模拟仿真继电器的特性,利用故障时故障录波器记录的数据对保护的动作行为进行分析的强有力的工具。最后通过利用此软件对华东电网一次特殊事故所进行的分析,证明了其正确性和实用性。     

一种极化继电器的设计与应用

介绍了一种极化继电器的总体结构设计、动作原理、磁路系统设计和接触系统设计。详细阐述了极化继电器动程与触点间隙的优化设计、推动点位置的优化设计和双线圈继电器的两线圈匹配设计。     

Directional overcurrent and earth-fault protections for a biomass microgrid system in Malaysia

Over-current protection is principally intended to counteract excessive current in power systems. In distribution systems in Malaysia, non-directional over-current protection is adopted because of the radial nature of the power system used. Relay typically used in distribution network are designed to cater for current flow in one direction, i.e., from transmission network to load. However, with the forecasted increase in generation from renewable sources, it is important that adequate codes are in place with regards to their integration to sub-transmission/distribution network. Distribution network dynamically changes from “passive” to “active” network. With distributed generation connected to distribution network, power flows bi-directionally. Hence, directional over-current protection is adopted along the line between the transmission grid and the distributed generation. The bi-directional flow of power also complicates the earth fault protection. This is due to the presence of the distributed generation that will cause the line near the delta side of the transformer to be still energized after the operation of earth fault relay during single-phase-to-ground-fault. This paper investigates the directional over-current and earth fault protections used to protect the microgrid (biomass generator) in Malaysia. In this study, under-voltage relays are adopted at the delta side of the transformer to fully clear the single-line-to-ground fault, which cannot be cleared by earth fault relay. Three-phase-balanced fault and single-line-to-ground-fault at all possible locations in the network have been simulated. Simulation shows good coordination and discrimination between over-current relays.     

浅析继电器的应用选型

本文阐述了继电器的应用选型是切实提高系统运行可靠性的关键问题，结合系统的工作特性和工作环境及继电器产品特性，论述了继电器的选型原则。     

新型微机式电流方向继电器研究

提出了一种新型微机式方向继电器即电流方向继电器,分析了它的基本工作原理、硬件构成及基本的实现方法,还分析了具体实现过程中可能遇到的问题及其对策。这种方向继电器只需要检测电流值和电压的相位信息就可以实现短路故障方向的正确判别。由于它不需要检测电压信号的值,所以具有结构简单、实现容易、成本较低、动作较快、工作可靠等优点。此外,该型方向继电器的动作范围和灵敏角的设置非常简单、方便、灵活,而且其电压死区问题得到了很好的解决。     

论突变量距离继电器

首次对各种类型的突变量距离继电器的性能进行全面分析比较，提出统一的动作判据，并对反应于补偿电压的方向元件的性能进行了较深入探讨。     

常规变电所进行综合自动化改造遥控功能的实现

阐述了对常规变电所进行综合自动化的改造的技术方法,以实现无人值班,应用远方遥控操作功能对变电所的设备进行控制。常规变电所要实现自动化管理,保证遥控动作的可靠性,必须对二次保护回路进行技术改造。     

Sensitivity improvement of time overcurrent relays

In this paper, we recommend a new adaptive function for time overcurrent relays. The purpose of the adaptation process is to improve the sensitivity of time overcurrent relays, which then operate with a dynamic pickup setting such as a load current. The results obtained from time overcurrent adaptive relays are collated, and the results from analysis of negative sequence relays and conventional time overcurrent relays are also presented. In this article, we describe the control logic structure of an adaptive pickup current and its performance under different operating states.