Study on The Influence of Temperature on The Standard Electricity Meter And Its Improvement Design

The verification of electricity meters is generally carried out in a narrow temperature range, such as $20^{\circ}\mathrm{C}\pm 2^{\circ}\mathrm{C}$, so the temperature effect does not need to be considered. However, under the condition of large-scale automatic verification, the temperature distribution in the space is extremely uneven, and the maximum temperature difference can reach $10^{\circ}\mathrm{C}$ or even higher. The adaptability of the standard electricity meter to the temperature becomes the key factor that affects the verification results. In this paper, the relationship between the error of the standard electricity meter and the temperature is quantitatively studied by experiments. The results show that the error of the standard electricity meter has a linear relationship with the temperature, and the absolute temperature coefficient is about 0.0013. In order to improve the adaptability of the standard electricity meter to the temperature, the constant temperature method is adopted to improve the design of the standard meter. The control accuracy of the designed temperature control system can reach $\pm 0.5^{\circ}\mathrm{C}$. The test results show that, the error of the improved standard electricity meter is less than 0.02% in the range of $10^{\circ}\mathrm{C}$ to $35^{\circ}\mathrm{C}$, which meets the application requirements of verification in a wide temperature range.