CP1586 ‘Defining the requirements for Minimum Burden and CT ratios’
Formal title: Defining the requirements for Minimum Burden and Current Transformer (CT) ratios
In some cases, the Current Transformer (CT) ratios for the maximum current of the circuit is not appropriately selected, even though these ratios are vital for accurate energy settlement as they ensure safe and precise current conversion, maintain metering equipment within its optimal operating range, and uphold regulatory compliance standards. CP1586 originates from Issue 93 ‘Review of the BSC Metering Codes of Practice’.
The core issue at hand with CP1586 revolves around the occasional misalignment of CT ratios with the circuit’s maximum current, which is integral to the accuracy and integrity of energy settlements. This misalignment can lead to inaccuracies in the measurement of electrical currents, subsequently affecting the reliability of the settlement process. To rectify this, CP1586 proposes targeted amendments to the Codes of Practice (CoPs) to provide clear, actionable guidance on selecting CT ratios that are appropriate for the full spectrum of operating conditions. These amendments aim to ensure that the Metering System’s accuracy is consistently maintained within the specified limits, safeguarding the precision of energy settlements. By addressing the selection of CT ratios and the associated burdens, CP1586 seeks to enhance the robustness and trustworthiness of the settlement system, thereby supporting the overall efficiency and fairness of the UK’s electricity market.