II. Switchgear and Protective Devices

Fixed or Withdrawable Switchgear

RO-15 This paper focuses on medium voltage switchgear in withdrawable execution, compared to medium voltage switchgear in fixed execution. Looking at the benefits and disadvantages of both executions, and the function the switchgear has to fulfill. Elaborating both executions, investigating accidents and near accidents; analyzing the causes, and studying the possibility of unsafe operation. Giv...

LV switchgear: functions & selection

cohesion and cohesive devices in a contrastive analysis between ge and esp texts

the present study was an attempt to conduct a contrastive analysis between general english (ge) and english for specific purposes (esp) texts in terms of cohesion and cohesive devices. to this end, thirty texts from different esp and ge textbooks were randomly selected. then they were analyzed manually to find the frequency of cohesive devices. cohesive devices include reference, substitution, ...

New 550-kV Gas-insulated Switchgear

OVERVIEW: Hitachi has developed smaller and more reliable gas-insulated switchgear (GIS) in response to demands for lower costs and stable power supplies. Reliability of this GIS was improved and the enclosure diameter was reduced in order to minimize the installation space by using new analysis techniques and rationalization in insulation design and in temperature rise criteria. Furthermore, t...

Reliability of Microprocessor–based Protective Devices –– Revisited

The article is a continuation of a set of the author’s previous publications about the reliability of the microprocessorbased protective devices. The statistical data introduced by the author coincide with data of other authors and confirm higher reliability of electromechanical relays in comparison with microprocessor-based. The inadequacy of the criterion for estimating the reliability of the...