Introduction: The increase of embedded generation penetration will create considerable voltage rise along LV feeders resulting in statutory limits not being met. An example problem area would be the secondary substation, Heol Glyndwr, in North Wales which is currently established as our trial site. Voltage issues are being experienced even with 30% of the desired connections being refused on grounds of system re-enforcement.

Currently, SPEN can charge the customer for re-enforcement costs for multiple premise connection but we can not refuse any number of single premise applications. Therefore, the re-enforcement costs would be SPENs responsibility. Magtech offer a cheaper solution to this problem than system re-enforcement in the form of a voltage regulating transformer that does not use mechanical methods to alter tap. This new transformer will be rated at 500 kVA, include an existing mechanical tap changer as a fail-safe and meet the Manweb Tall Type transformer specification.

In addition, although not directly pertinent in this project, this technology can be used to boost as well as buck voltage and would give valuable insight into how voltage regulating transformers can be used to deal with the potential issues of heat pumps and electric vehicles.

Objectives: The projects aims to realise the following objectives:

• To provide a method to constantly manage voltage levels to remain within the statutory limits

• To allow additional embedded generation onto the system that would have previously been refused

• To analyse the transformer's capability to determine its potential for an interconnected system.