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Measurement methods and test procedures for assessing accuracy of instrument transformers for power quality measurements

Short Name: IT4PQ, Project Number: 19NRM05
Power substation

Characterising Instrument transformers to develop new standards for more reliable power quality measurements


Renewable electricity can cause grid-injected disturbances, damaging power quality (PQ). PQ represents the grids ability to supply constant, stable power and PQ problems cost EU industry and commerce around €150 billion annually. To reduce network currents and voltages down to a level compatible with PQ measurement instruments requires the use of Instrument Transformers (ITs). However current international standards fail to account for IT performance in the presence of disturbances and do not detail specific IT characterisation tests, making it impossible to perform PQ measurements in electricity grids with a known level of confidence

 

Building upon the EMRP projects SmartGrid II and FutureGrid the project has defined accuracy and uncertainty limits for ITs in PQ measurements, developed reference measuring systems and traceable test procedures and assessed IT performance with multiple influence factors. At the end of the project in 2023 recommendations will be given to IEC TC38 to incorporate into new standards. Increased confidence in PQ measurements will allow electricity utilities and industries to take appropriate actions to help prevent or solve any PQ related issues.

Project website
Publications
Reference Measurement Systems for the Calibration of Instrument Transformers Under Power Quality Phenomena and their Uncertainties
2023

2023 IEEE 13th International Workshop on Applied Measurements for Power Systems (AMPS)

How Undesired Non-Idealities of the Input Signal Affect the Accuracy Evaluation of Instrument Transformers at Power Frequency
2023

2023 IEEE 13th International Workshop on Applied Measurements for Power Systems (AMPS)

Reference system for current sensor calibrations at power frequency and for wideband frequencies
2022

2022 20th International Conference on Harmonics and Quality of Power

Impact of external influences on the frequency dependent transfer ratio of resin cast MV voltage instrument transformers
2022

2022 20th International Conference on Harmonics & Quality of Power (ICHQP)

Evaluation of Voltage Transformers’ Accuracy in Harmonic and Interharmonic Measurement
2022

IEEE Open Journal of Instrumentation and Measurement

Theory and Experimental Validation of Two Techniques for Compensating VT Nonlinearities
2022

IEEE Transactions on Instrumentation and Measurement

Stray Parameter Evaluation of Voltage Transformers for PQ Measurement in MV Applications
2022

2022 20th International Conference on Harmonics & Quality of Power (ICHQP)

Improving Harmonic Measurements with Instrument Transformers: a Comparison Among Two Techniques
2021

2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

Instrument Transformers for Power Quality Measurements: a Review of Literature and Standards
2021

2021 IEEE 11th International Workshop on Applied Measurements for Power Systems (AMPS)

Measuring Harmonics With Inductive Voltage Transformers in Presence of Subharmonics
2021

IEEE Transactions on Instrumentation and Measurement

A simplified procedure for the Accurate Frequency Response Identification of Voltage Transformers
2020

Proceedings of the 24th IMEKO TC-4 International Symposium, September 14-16, 2020

Measurement Methods and Procedures for Assessing Accuracy of Instrument Transformers for Power Quality Measurements
2020

Conference on Precision Electromagnetic Measurements CPEM 2020 Proceedings

Other Participants
Alma mater studiorum Università di Bologna (Italy)
Ricerca sul Sistema Energetico – RSE S.p.A. (Italy)
Technische Universität Dresden (Germany)
Università degli studi della Campania Luigi Vanvitelli (Italy)

Information

Programme
EMPIR
Field
Normative
Status
completed
Call
2019
Duration
2020-2023