Fixed or withdrawable switchgear — Withdrawable switchgear, past or future?

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. Giving a clear picture on the total cost of ownership, including the reliability, availability and peripheral influences, such as; cable connection, switchroom size and process control connection. Also looking at operator friendliness, how easy is it to work with the switchgear, how complicated the switching procedure is, and also looking at how complicated conducting maintenance inspections, or maintenance measurement is. The aim of this paper is to provide a clear guideline as to which type of execution is favourable, in a specific situation, taking into account the newest technologies in switchgear and network architecture. After a short introduction to medium voltage switchgear and their applications, the first part of this paper will describe the main aspects, like safety, reliability and cost, of both withdrawable and fixed executions. Followed by chapters that explain the different aspects, to be considered when purchasing a switchgear. Additionally the situations of usages is highlighted. Followed by a chapter that compares fixed and withdrawable medium voltage switchgear. The paper finishes with a hint how to choose between fixed or withdrawable medium voltage switchgear.