Non-conventional instrument transformers enabling digital substations for future grid

Thomas, R; Vujanić, A.; Xu, David; Sjodin, J. E.; Salazar, Hernan; Yang, Meng; Powers, N.

doi:10.1109/tdc.2016.7519930

Cited by 19 publications

(9 citation statements)

References 2 publications

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“…The technology of fibre optic (FO) has helped rapid development of non-conventional instrument transformer including OCT. It is obvious that the OCT has important advantages over CCT [13] thus providing proven solution for future substation [14]. In this case, incorporation of the optical sensor allows a smaller dimension and lighter weight that would not be significantly influenced by the power rating, ratio, and insulation level of the whole OCT [9], [15].…”

Section: Optical Current Transformermentioning

confidence: 99%

Impact of optical current transformer on protection scheme of hybrid transmission line

Arifin¹,

Zulham

Prasetyo³

2021

IJEECS

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Continuity of power transmission is important to ensure the reliability of the electricity supply. As most system faults are temporary, the auto reclose (AR) scheme has been used extensively to minimise the outage duration, prevent widespread outages, thus increase system stability. Meanwhile, the hybrid transmission line (HTL) combining overhead line (OHL) and high voltage cable has been introduced to provide an inexpensive solution for an urban power grid. Protecting HTL with a conventional protection system would forbid the operation of the AR scheme due to difficulty to ensure whether the fault occurred on the OHL or cable section. Therefore, the circulating current protection (CCP) scheme is used in the cable section to ensure the fault location and block the AR scheme. The technology of an optical current transformer (OCT) as one of the non-conventional instrument transformers (NCIT) has emerged to provide a solution to drawbacks on the conventional current transformer (CCT). Consequently, this paper investigated the impact of using OCT over the CCT for CCP of the HTL. The result shows that OCT could be used for CCP on much longer cable sections thus increase its reliability as the AR scheme can be used on longer or multiple cable section.

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Section: Optical Current Transformermentioning

confidence: 99%

Impact of optical current transformer on protection scheme of hybrid transmission line

Arifin¹,

Zulham

Prasetyo³

2021

IJEECS

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“…New power grids are incorporating digital technologies, communications systems, and standards that are driving the evolution of failure detection, metering, and control layers to meet the 21st-century challenges [ 1 ]. Smart Grid sensors are relevant elements in this evolution that provide real-time data and status of the grids for real-time monitoring, protection, and control of grid operations [ 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Power-over-Fiber LPIT for Voltage and Current Measurements in the Medium Voltage Distribution Networks

Bassan

Rosolem

Floridia

et al. 2021

Sensors

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In this work, we present the design, laboratory tests, and the field trial results of a power-over-fiber (PoF) low power instrument transformer (LPIT) for voltage and current measurements in the medium voltage distribution networks. The new proposed design of this power-over-fiber LPIT aims to overcome the drawbacks presented by the previous technologies, such as the continuous operation (measuring and data transmission) for a wide current range conducted in the medium voltage transmission lines, damage due to lightning strikes, accuracy dependency on vibration, position and temperatures. The LPIT attends the accuracy criteria of IEC 61869-10 and IEC 61869-11 in terms of current and voltage accuracy and it attends the practical criteria adopted by Utilities companies including voltage measurements without removing the coating of the covered conductors. The PoF based LPIT was developed to be applied at 11.9 kV, 13.8 kV, and 23.0 kV phase-to-phase nominal voltages, and in two current ranges 1.25–30 A and 37.5–900 A. The digital data transmission of current, voltage, and temperature from the sensing unit to the processing unit uses a special synchronism technique and it is performed by two 62.5 µm multimode fibers in 850 nm. The optical powering in 976 nm is also performed by one 62.5 µm multimode fiber from the processing unit to the sensor unit. We presented all details of the sensor design and its laboratory characterization in terms of accuracy and temperature correction. We also presented the results of field tests of the sensor made in two different conditions: in a standard distribution network and an experimental hybrid fiber/power distribution network. We believe that these studies aim to incorporate optical fiber and devices, digital technologies, communications systems in electrical systems driving their evolution.

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“…In this paper, we consider the problem of calibrating a measuring bridge for NCITs from a metrological point of view [20,21]. In particular, we describe a novel measurement setup and discuss the implementation challenges and requirements as well as the possible uncertainty contributions.…”

Section: Introductionmentioning

confidence: 99%

Calibration of a Digital Current Transformer Measuring Bridge: Metrological Challenges and Uncertainty Contributions

Frigo

Agustoni

2021

Metrology

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In this paper, we consider the calibration of measuring bridges for non-conventional instrument transformers with digital output. In this context, the main challenge is represented by the necessity of synchronization between analog and digital outputs. To this end, we propose a measurement setup that allows for monitoring and quantifying the main quantities of interest. A possible laboratory implementation is presented and the main sources of uncertainty are discussed. From a metrological point of view, technical specifications and statistical analysis are employed to draw up a rigorous uncertainty budget of the calibration setup. An experimental validation is also provided through the thorough characterization of the measurement accuracy of a commercial device in use at METAS laboratories. The proposed analysis proves how the calibration of measuring bridges for non-conventional instrument transformers requires ad hoc measurement setups and identifies possible space for improvement, particularly in terms of outputs’ synchronization and flexibility of the generation process.

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Non-conventional instrument transformers enabling digital substations for future grid

Cited by 19 publications

References 2 publications

Impact of optical current transformer on protection scheme of hybrid transmission line

Impact of optical current transformer on protection scheme of hybrid transmission line

Power-over-Fiber LPIT for Voltage and Current Measurements in the Medium Voltage Distribution Networks

Calibration of a Digital Current Transformer Measuring Bridge: Metrological Challenges and Uncertainty Contributions

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