Abstract
Measurement accuracy is an important performance indicator for high-voltage direct current (HVDC) voltage dividers. The temperature rise effect for a HVDC voltage divider’s internal resistance has an adverse effect on measurement accuracy. In this paper, by building a solid model of a DC voltage divider, the internal temperature rise characteristic and error caused by the temperature rise in a resistance voltage divider were theoretically simulated. We found that with the increase in height and working time, the internal temperature of the voltage divider increased. The results also showed that the lowest temperature was near the lower flange and the highest temperature was near the upper flange in the middle of the voltage divider. The error caused by the temperature rise increased first and then decreased gradually with divider height, increasing with its working time. The measurement error caused by the internal temperature difference in steady state reached a maximum of 158.4 ppm. This study provides a theoretical basis to determine the structure and accuracy improvement for a resistive voltage divider, which is helpful for the selection of components and the optimization of the heat dissipation structure.
Highlights
A direct current (DC) voltage divider is the key piece of equipment in a high-voltage direct current (HVDC) transmission system, which is mainly used for voltage measurement and provides voltage signals to secondary protection and related devices [1]
The research on precision characteristics of HVDC voltage measuring equipment shows that the influence of temperature on the precision of a resistance ratio is one of the main factors that affects measurement stability
The results showed that the temperature distribution of DC voltage divider had influence on the voltage divider ratio, and the higher the voltage level was, the worst the influence became [14]
Summary
A direct current (DC) voltage divider is the key piece of equipment in a high-voltage direct current (HVDC) transmission system, which is mainly used for voltage measurement and provides voltage signals to secondary protection and related devices [1]. Feng et al analyzed measurement error caused by the internal temperature difference of DC resistance voltage divider, which reached 3 × 10−4 , but the calculation process was too simple to have universal reference significance [13]. The influence of the internal temperature difference on the measurement accuracy of the DC voltage divider was analyzed based on its working principle. It provides a theoretical basis for the determination of the structure and the improvement of the accuracy of the voltage divider and helps to select the components in the design stage of the voltage divider. It helps to evaluate the accuracy and stability of the voltage divider operation at the same time
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