高压变频器中IGCT的快熔保护

提出利用快速熔断器来实现高压变频器中IGCT器件的保护,在对高压变频器三电平逆变回路发生的“直通”故障分析基础上进行快熔计算选择,并分析所选快熔特性,最后给出结论。     

用于电力机车整流装置短路保护的半导体器件保护用熔断体

介绍了一种适用于电力机车整流装置中作为整流装置短路保护的半导体器件保护用熔断体,阐述了该熔断体的工作原理、设计思路与应用。     

保护大容量半导体装置的熔断器

介绍了一种保护半导体装置用的薄膜型熔断器的特点、结构和有关制造技术。它具有良好的限充作用、较低的允通焦耳积分和熔体电流密度（６ｋＡ／ｍｍ＾２以上），熔断器外形尺寸小和特性稳定，是一种今后保护半导体装置用的熔断器的发展方向。     

Liquid Cooling of Power Thyristors

A method of determining a given heat exchanger's thermal properties from the characteristics of the cooling medium is discussed. A test method is presented with an example which helps to clarify the results. It is concluded from running tests using three to four different liquids that heat exchanger thermal performance data can be derived for liquids having a wide range of liquid properties.     

Current-Limiting Fuse Update?New Style Fuse for Protection of Semiconductor Devices

Power equipment utilizing power diodes, silicon-controlled rectifiers (SCR's), and other semiconductor devices continues to take a greater role in electrical distribution systems. Rectifiers, uninterruptible power supply (UPS) systems, ac and dc solid state motor drives, solid state power controllers, and other such equipment require overcurrent protection suited to the special needs of the semiconductor device, and the special requirements for the type of circuitry. The important characteristics of a new line of fuses which is specially designed for the protection of semiconductor devices are described. The major considerations for semiconductor fuse protection are emphasized and a practical protection approach is presented.     

保护单台电容器用的具有双重保护特性的高压限流熔断器研制成功

目前,在我国尚未有既能对单台并联电容器进行过载保护且能对短路电流进行限流保护的熔断器,国内生产的保护单台并联电容器的熔断器有两种:一种是喷射式熔断器,只能对电容器进行过载保护;另一种是限流式熔断器,只能对电容器进行短路保护。因此,在实际运用中,只能把这两种熔断器串联起来,以达到对电容器的过载及限流双重保护的目的,但这样就使得成本高,且安装不便。     

Ratings and Applications of Power Thyristors for Resistance Welding

Guidelines are given for applying SCR's in resistance welding controls. The stresses the SCR's are subjected to in resistance welding applications due to the cyclic nature of the load are discussed from a device, design, and application point of view. In addition the special rating of SCR's and cooling requirements for cyclic duty are described along with techniques for protecting the devices from overvoltage, overcurrent, and loss of coolant. Gating requirements are outlined from a circuit view point.     

Fuse Selection for Power Semiconductor Conversion Equipment

The proper selection of fuses for use with power semiconductor conversion equipment has taken on greater importance as the size of these equipments has increased and the designs become more sophisticated. Approximately four years ago a working group was formed to study the application and specification of fuses for semiconductor devices and to establish testing procedure, and basis of rating of such fuses.     

并联电容器组的熔丝保护

变电站并联电容器的熔丝配置采用何种方式最适用,一直以来设计以及运行人员各有不同的看法和观点,不同的运行部门选用的保护方式各异。重点介绍了各种故障保护的特点并作出比较,提出了最优的保护方式。     

配电变压器的熔断器保护

分析了限流熔断器和负荷开关-熔断器组合电器在环网供电单元和预装式变电站中的应用形式与特点,介绍了熔断器选择的基本原则.     

高压电力电容器用内熔丝

分析了电容器内熔丝动作特点、机理等有关技术问题,提出了设计内熔丝时应根据试验曲线决定内熔丝的直径和长度,并与外熔断器性能进行了比较。推荐高压滤波和并联电容器组大量采用内熔丝电容器,可靠性高,修理亦有计划性。     

电容器组熔断器保护配置分析

通过对现在采用的熔断器保护的配置和熔丝额定电流选择的分析,对熔断器保护目前状况及存在的问题进行探讨,提出正确选择熔丝额定电流和对熔断器的标准合理修改,确保电容器组安全可靠运行。     

The Recovered Charge Characteristics of High Power Thyristors

The recovery characteristics of high power thyristors and diodes becomes increasingly important to the circuit designer as devices are made larger and faster. This paper considers various types of recovery as well as some important circuit influences on the recovery characteristics of power devices. Low and high frequency device data are presented for a number of different circuit conditions. The effects of spreading velocity, peak current during conduction, conduction pulsewidth, and commutating di/dt are considered. A new method for recovered charge data presentation is shown and some practical test circuit design considerations are discussed.     

一种符合IEC标准的电压互感器保护用真空式限流熔断器

目前,国际上还没有能够完全保护电压互感器的熔断器,以及相应的IEC标准。笔者研究了一种新型的真空混合式全范围限流熔断器来保护电压互感器,为制定出相应的IEC标准提供技术支持,并指导该类产品的设计、制造、试验和运行。该产品是由真空熔断器和限流熔断器串联组成,采用环氧树脂工艺浇铸而成。根据熔断器的基本工作原理,利用真空熔断器具有特别陡的时间-电流特性,来开断小过载电流;利用限流熔断器来开断大过载电流和短路电流。试验结果验证该熔断器能够保证在额定电压因数波动范围为1～1.2时能够长期正常工作,额定电压因数为1.9时可以在30s内可靠动作,并且顺利开断了31.5kA的短路电流,实现了对电压互感器的妥贴保护。该产品具有结构新颖、性能安全可靠、性价比高等优点。     

太阳能光伏系统保护用熔断体标准分析

分析了IEC太阳能光伏系统保护用熔断体标准。介绍了光伏熔断体特性与试验。将IEC标准与UL草案稿相比较,分析了两者之间的差异和相互影响。     

保险丝与快熔迷思

本文对快熔的概念和选用进行了分析,给出了选用的注意事项。     

无熔丝电容器组不对称接线保护的计算法

对故障电流小、保护灵敏度高的无熔丝并联电容器组不对称接线保护的有关计算进行探讨 ,得出继电保护整定的计算公式和通过短路元件故障电流的计算公式。     

单台并联电容器保护用熔断器试验情况及使用问题的分析

结合DL442—1991修订要求,对国内主要的熔断器厂的产品进行抽检及验证试验,分析并提出了对熔断器使用中的具体要求和应注意的问题。     

单台并联电容器保护用溶断器试验情况及使用问题的分析

结合DL442—1991修订要求，对国内主要的熔断器厂的产品进行抽检及验证试验，分析并提出了对熔断器使用中的具体要求和应注意的问题。     

直流电源系统保护中直流断路器及熔断器的级差配合探讨

文章针对直流回路保护常见问题,分别从熔断器的级差配合、直流断路器的级差配合、熔断器与直流断路器混合使用的级差配合等方面进行了论述,提出了直流回路保护元件的选用和级差配合的基本原则以及注意事项等,指出直流回路中禁用交流断路器。