Some operating experiences of 10kV small signal EVT in Fengzhou digital substation

Huang, Shangyuan; Chen, Jinmu; Zhang, Jinsong

doi:10.1109/iceceng.2011.6057055

Cited by 2 publications

(2 citation statements)

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“…Therefore, to increase protection devices in isolated power output port is considered firstly [9][10][11][12][13][14].…”

Section: A Add Protection Devices In the Isolated Power Output Portmentioning

confidence: 99%

Research on measurement accuracy of EVT during the surge

Hu¹,

Ye²,

Hua³

et al. 2014

2014 International Conference on Power System Technology

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Electronic Transformers (ETs) are the most important equipments of the Smart Grid. There are many optics and electronics devices used in the ETs, and they usually work under the high voltage part or low voltage part of primary equipments, so the ETs are easily interfered by the complex electromagnetic environment. This article aims to improve the measurement accuracy of the Electronic Voltage Transformer (EVT) during the surge test, find out the root cause and put forward two solutions. One solution is for the output of the power and the other is for the input of the power. We have finished the theoretical analysis and experimental verification, and proved that they are worked to improve the reliability of the EVT.

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“…Therefore, to increase protection devices in isolated power output port is considered firstly [9][10][11][12][13][14].…”

Section: A Add Protection Devices In the Isolated Power Output Portmentioning

confidence: 99%

Research on measurement accuracy of EVT during the surge

Hu¹,

Ye²,

Hua³

et al. 2014

2014 International Conference on Power System Technology

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show abstract

“…Electronic transformers (ETs) have been widely applied to intelligent substations in the past few years [1][2][3][4]. However, the ETs are unable to meet the engineering application requirements due to their poor long-term stability and reliability [5,6]. Considering the actual situations, analogue MUs are employed in the new generation of intelligent substations in China.…”

Section: Introductionmentioning

confidence: 99%

Metrology and Measurement Systems

Cheng

Huang

et al. 2018

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Synchronization signals are requisite for calibrating electrical measurement devices with digital output when using conventional calibration methods. However, since the signal sampling process of the analogue merging units (MUs) operating in an intelligent substation does not rely on external synchronization signals, accuracy calibration without the use of synchronization signals is of particular importance in order to guarantee the measurement accuracy in practical situations. So far, very little research on calibration systems independent of synchronization signals has been performed. This paper presents a design of the calibration system without dependence on synchronization signals. To verify the feasibility of the proposed design, the designed system and a conventional calibration system have been employed in testing the accuracy of the same analogue MU of a 0.2 accuracy class. The comparison of the test results shows that the differences of ratio errors are below 0.02%, and the maximum difference of phase errors is about 4 ′ . This paper also provides a new efficient and significant calibration method which does not require any external synchronization signals.

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Some operating experiences of 10kV small signal EVT in Fengzhou digital substation

Cited by 2 publications

References 0 publications

Research on measurement accuracy of EVT during the surge

Research on measurement accuracy of EVT during the surge

Metrology and Measurement Systems

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