Development and Application of High-Frequency Sensor for Corona Current Measurement under Ultra High-Voltage Direct-Current Environment

Yuan, Haiwen; Yang, Qinghua; Liu, Yuanqing; Lu, Jiayu; Akhtar, S.

doi:10.1109/tim.2011.2179337

Cited by 25 publications

(11 citation statements)

References 22 publications

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“…The test line was open ended, which led to reflections. The evidence can be found in the measured waveform which is a mixture of the original pulse and reflected pulses [18].…”

Section: Introductionmentioning

confidence: 90%

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Accurate measurement of original current pulses because of positive corona in the coaxial cylindrical arrangement

Liu

Cui

et al. 2015

IET Science, Measurement & Technology

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Current pulse because of positive corona discharge is a main source of radio interference (RI). An accurate measurement of the original corona pulse is necessary to study corona-generated RI. However, the corona pulse is likely to be distorted by either LC oscillation or reflection. In this study, an experiment system with single corona source is built which can provide a nearly free-reflection path for the current pulses, and measurements are carried out in the system. The magnitude of the measured waveform is close to one half of the original pulse, which proves the accuracy of the measurement method. In order to obtain the original current pulse, a comprehensive model for the current pulses' path, taking the stray capacitance and stray inductance into consideration, is established. Based on the model, an inversion method to derive the original pulse is proposed. In combination with the obtained original pulse, the model gives the calculated results for other experimental conditions. The calculated results agree well with the measured results, which provide solid validation for the accuracy of the measurement. Another advantage of the proposed measurement method is that the long cables enable the accurate measurements to be achieved under any terminal conditions.

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“…The test line was open ended, which led to reflections. The evidence can be found in the measured waveform which is a mixture of the original pulse and reflected pulses [18].…”

Section: Introductionmentioning

confidence: 90%

“…However, the coupling capacitor may show considerable impedance at some concerned frequencies and thus it is impossible to achieve a wideband measurement through this configuration. In [18], a sampling resistor was connected between the power supply and the test line. The test line was open ended, which led to reflections.…”

Section: Introductionmentioning

confidence: 99%

Accurate measurement of original current pulses because of positive corona in the coaxial cylindrical arrangement

Liu

Cui

et al. 2015

IET Science, Measurement & Technology

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“…In the HV local area, the high precise no-inductance resistor is applied as the current sensor. [22][23][24][25] The resistor is connected in series with the bundle conductors in the test lines. The optically powered electronic current transformer is used to convert and transmit the current signal.…”

Section: Corona Current Measurement System Frameworkmentioning

confidence: 99%

Development of a sensor for corona current measurement under high-voltage direct-current transmission lines

Xin

Yuan

2016

International Journal of Distributed Sensor Networks

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A sensor-based distributed measurement system is designed for collecting and monitoring the corona current under the extremely high-voltage direct-current transmission lines. It is highly significant for researching the corona characteristics of extremely high-voltage direct-current transmission lines to reduce the corona effect, operating loss, and environmental impact. A new shared memory strategy has been studied based on field-programmable gate array and ARM. Based on field-programmable gate array technology, the fiber-optic transmission scheme for wide-frequency corona current highspeed signal has been set up to ensure the safety and the reliability of corona current measurement system. The proposed system has been used in China's state grid high-voltage direct-current test base and the in situ power transmission projects. Based on the experimental results, the proposed measurement system demonstrates that it can adapt to the complex electromagnetic environment under the transmission lines and can accomplish the accurate, flexible, and stable demands of the electric-field measurement.

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“…DC transmission is an important means to realize interconnected power grids and transmission that has ultra-high voltage, large capacity, and low-loss for long distances. With the rapid development of high voltage direct current (HVDC) transmission systems, ultra-high voltage DC transmission projects are gaining popularity [1,2,3,4]. At present, the commonly used current transformer in DC power transmission systems is the electronic current transformer based on shunt.…”

Section: Introductionmentioning

confidence: 99%

A Direct Current Measurement Method Based on Terbium Gallium Garnet Crystal and a Double Correlation Detection Algorithm

Shen

Chen

et al. 2019

Sensors

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When applying an optical current transformer (OCT) to direct current measurement, output signals exhibit a low signal-to-noise ratio and signal-to-noise band overlap. Sinusoidal wave modulation is used to solve this problem. A double correlation detection algorithm is used to extract the direct current (DC) signal, remove white noise and improve the signal-to-noise ratio. Our sensing unit uses a terbium gallium garnet crystal in order to increase the output signal-to-noise ratio and measurement sensitivity. Measurement errors of single correlation and double correlation detection algorithms are compared, and experimental results showed that this measurement method can control measurement error to about 0.3%, thus verifying its feasibility.

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Development and Application of High-Frequency Sensor for Corona Current Measurement under Ultra High-Voltage Direct-Current Environment

Cited by 25 publications

References 22 publications

Accurate measurement of original current pulses because of positive corona in the coaxial cylindrical arrangement

Accurate measurement of original current pulses because of positive corona in the coaxial cylindrical arrangement

Development of a sensor for corona current measurement under high-voltage direct-current transmission lines

A Direct Current Measurement Method Based on Terbium Gallium Garnet Crystal and a Double Correlation Detection Algorithm

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