On site metrological verification of high voltage current transformers using optical transducer

Costa, Marcelo Melo da; Costa, João Crisóstomo Weyl Albuquerque

doi:10.1109/imoc.2013.6646571

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…NXCT‐F3 produced by Alstom can realise the online calibration of a transformer rated up to 550 kV; however, its accuracy does not fulfil the requirement of 0.1% [11]. Rahmatian introduced the application of optical voltage transformer (VT)and CT in online testing.…”

Section: Introductionmentioning

confidence: 99%

Passive‐compensation clamp‐on two‐stage current transformer for online calibration

Xiong

et al. 2021

IET Science Measure & Tech

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Digital measurement equipment such as electronic transformers enable real-time functional control and monitoring systems to be built in power grids to accommodate the large-scale access of distributed renewable energy to the grid. However, the current offline calibration of electronic transformers is difficult to implement; therefore, an online calibration method for electronic transformers must be developed to ensure their accuracy. The design of a clamp-on two-stage current transformer (CTS-CT) with a passive compensation loop is presented herein. The compensation loop is utilised to reduce both the amplitude and phase errors, thereby achieving high accuracy. The formulas for calculating the resistance and capacitance of the passive compensation loop are presented. The expanded uncertainties (95% confidence level) of the proposed CTS-CT are estimated to be lower 0.03% for the amplitude error and 1′ for the phase error. Experimental results indicate that the proposed CTS-CT prototype is not affected by the external magnetic field nor the opening and closing times, thereby enabling good-quality online calibration for field applications. Moreover, the proposed CTS-CT adopts neither an active compensatory circuit nor software compensation; therefore, the manufacturing of the CTS-CT is steady and simple, and the calibration procedures are simplified.

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Section: Introductionmentioning

confidence: 99%

Passive‐compensation clamp‐on two‐stage current transformer for online calibration

Xiong

et al. 2021

IET Science Measure & Tech

View full text Add to dashboard Cite

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“…In fact, obstacles for appropriate OCT functionality are the external factors, like temperature variation. Nowadays, the main challenge of OCTs is to prove their long-term stability against aforementioned external factors [14]- [18].…”

Section: Introductionmentioning

confidence: 99%

Optical Current Transducers and Error Sources in Them: A Review

2015

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Optical current transducers are developed vastly in recent decades. For an accurate transducer achievement, different factors should be considered. This paper reviews the most important sources of errors in these devices. First, the main types of transducers are introduced. Afterwards, the effects of temperature and vibration on their operational performance are discussed. Then, the birefringence is addressed which is the main error source in the transducers. In each part, the proposed solutions in the papers are reviewed. Finally, the effect of nonideal optical parts on the measurement accuracy is discussed. The paper serves as a brief introduction to common errors in optical current transducers.Index Terms-Birefringence, Error decrement, Optical current transducers, Review.1530-437X (c)

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