The pluggable transformer: flexibility for future grids

Abstract Transformers are becoming more and more space-saving, but they also need to be flexible, perhaps even mobile. All components must offer highest operational reliability,...

byCarmen MERTENS, Ruben GRUND, Christian SPÄTH


Abstract

Transformers are becoming more and more space-saving, but they also need to be flexible, perhaps even mobile. All components must offer highest operational reliability, allowing quick installation as well as long-term flexibility.

This is the reason why separable connecting systems are the next step in connecting transformers. As they are making progress toward replacing conventional connection methods, the importance of an entire pluggable product portfolio is increasing. This portfolio includes pluggable surge arresters as they are a vital component for transformer safety. The dry-type pluggable surge arresters may highly reduce space requirements. A solution has now been developed for a rated voltage of up to 180 kV.

Keywords: dry-type pluggable transformer, space-saving, surge arrester

Introduction

Requirements on energy networks are continually changing dynamically and operators of power transformers are facing new challenges due to the reorganization of the load distribution. Substation size needs to be reduced and systems must be flexible, in special cases even mobile. Transformers in these applications must be quickly mounted and interchangeable, and they must offer outdoor and indoor use.

A separable connection system is used to connect a Cross-Linked Polyethylene (XLPE) or Ethylene Propylene Rubber (EPR) insulated cable to electrical equipment such as oil insulated transformers. Such a connecting system consists of two main parts – the socket and the connector, as shown in Figure 1. The separable connector is a male component that is plugged into the socket. It consists of the contact element, an insulating part including the electrical stress control, and a metallic housing.

Figure 1. Separable connecting system, socket and connector

 

 

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