Abstract
This paper describes an Asset Management Strategy for reducing the number of Medium Voltage (MV) levels in the service area of Stedin. Stedin is the DNO of a part of the Netherlands: the provinces of Utrecht and Zuid-Holland. The company was founded in 2008 and is a merger between multiple municipal grid companies. As a result of this merger, several MV levels were inherited. Progressive load development due to energy transition and increasing voltage problems due to Renewable Energy Sources (RES) necessitate a review of the existing voltage level of MV grids. The most economical grid consists of only one transformation step, and hence two voltage levels, in the HV and MV grids. In 2014 in a part of the city centre of Rotterdam the 10kV network was converted into a 20kV network. Research is now being done in scaling up the conversion of MV grids to the 20kV level. Doubling the voltage in a MV-grid means that a cable with a certain cross-section and suitable for 20kV can distribute double the amount of power. The MV-network of Stedin consists of underground cables - partly in dense urban environments - and a lower usage underground space is a very welcome benefit of using 20kV.
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