CP1519 ‘Treatment of Low Capacity Connections for Site Specific Line Loss Factor Calculations’
Formal title: Treatment of Low Capacity Connections for Site Specific Line Loss Factor Calculations
Line Loss Factors (LLFs) are calculated and applied to Metered Volumes to account for distribution losses. LLFs are calculated on an individual basis for sites connected at Extra High Voltage (EHV) and on a generic basis for other connections.
There are an increasing number of EHV Sites with a ‘main’ connection and a subordinate small-scale connection. The subordinate connection is often 1 MVA or less and the majority are ancillary import connections for Generating Plant and Apparatus e.g. to power aircraft avoidance lights on wind turbines when the turbine is not Generating its own power. Subordinate connections have low maximum demand and consumption and, if they were single connections in their own right, would be connected at lower voltage levels with generic LLFs.
CP1519 proposes to apply generic losses appropriate to the voltage of connection to sites with a capacity less than 1 MVA. There are already voltage boundary limits to qualify as EHV; this could be extended to applying a capacity boundary (e.g. low capacity sites less than 415V) as a proxy for determining subordinate connections. This would formalise a default replacement process for low consumption sites within Principle 17 of the LLF calculation principles.
CP1519 was raised on 16 July 2019. Progression papers for the Imbalance Settlmenet Group (ISG) and Settlement Volume Allocation Group (SVG) will be presented for information on 23 July and 6 August 2019 respectfully. This will be an opportunity for the ISG and SVG to provide feedback ahead of consulting as part of the August CPC batch on 12 August 2019.
On 12 August we published the consultation on CP1519, stakeholders have until 6 September 2019 to share their views. The consultation is available in the ‘Documents’ section below.
To help stakeholders with a quick explanation of the issue and details of the consultation, Chris Wood, a senior analyst in the BSC Change team, has recorded a podcast (see the link below). We hope you find this helpful and If you have any feedback on the podcast please get in touch with us at email@example.com
Following the consultation closing on 6 September, we will present the Assessment Report to the ISG on 17 September and the SVG on 8 October 2019. The Committees will make their decision at these meetings on whether CP1519 should be implemented