The 100a50ma Transformer and New IEC 61869-1 Edition

The 100a50ma Transformer and New IEC 61869-1 Edition

The 100a50ma transformer is a key building block in modern electrical power distribution systems.100a50ma transformer Whether deployed as a single or three phase 100kVA transformer, stepped up or step down, it optimizes capacity, footprint and cost across diverse load profiles and installation environments. Choosing the right 100kVA transformer requires balancing load characteristics, installation environment, safety requirements, efficiency targets and lifecycle costs to achieve optimal performance and reliability.

The new edition of standard IEC 61869-1 (released in 2023) defines the optional wideband accuracy class WB1 for inductive current transformers and voltage transformers (VTs).100a50ma transformer This class guarantees that their ratio error and phase displacement do not exceed 0.2 for harmonic frequencies up to 3 kHz, as specified in the new standard. These values are necessary for the transformation of distorted secondary current and power measurements, as well as for the evaluation of the power quality.

To meet the requirements of the new IEC 61869-1 edition for the transformation of distorted current higher harmonics, it is essential to test window type inductive CTs at conditions close to their rated primary ampere-turns.100a50ma transformer However, this is only possible by means of a differential measuring setup, which enables significantly reduced measurement uncertainty in relation to comparative measurements made between the secondary current channels of the reference and tested CTs.

This article presents a novel approach for testing window type inductive CTs at these conditions, using the concept of a virtual source of distorted current. This virtual source generates a high-order harmonic of the rated primary current that is injected into the secondary winding of the reference window-type inductive CT and measured by the measurement system. The resulting secondary currents are analyzed in detail to verify the required wideband transformation accuracy and, as an additional benefit, allow the application of a differential measuring setup with significantly reduced measurement uncertainty.

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