The hottest visit smart meter quality inspection r

Visit the whole process of smart meter quality inspection: you need to pass three passes before taking office

Abstract: some citizens questioned that the total electricity charge seemed to be high after changing smart meters. There are even rumors on the Internet that smart meters can read fast. Is there any problem with the accuracy of smart meters? What quality checks should the meter pass before being installed

nowadays, smart meters have entered thousands of households. Some citizens questioned that the total electricity charge seemed to be high after replacing the smart meter. There are even rumors on the Internet that smart meters can read fast. Is there any problem with the accuracy of smart meters? What quality checks should the meter pass before being installed? Recently, I visited the measurement base of the Electric Power Research Institute of the State Grid Tianjin electric power company to understand the whole process of the pre job inspection of smart meters

watt hour meter is a legal measuring instrument for power companies to settle electricity bills with citizens, enterprises and institutions, and it is the object of national compulsory inspection. The metrology base of Tianjin Electric Power Research Institute has a domestic advanced metrology automatic inspection system. Once a smart meter is "born", it must undergo a comprehensive "physical examination" here. During this period, technicians will strictly control the three inspections and carry out more than 80 inspections. Only qualified products can enter thousands of households

in the electric energy meter quality inspection laboratory, the technician Yan Jingjing is carrying out the following work, including accurately closing the oil delivery valve first, daily timing error Inspection work including voltage withstand test and appearance inspection: "we are the first inspection pass here, mainly for the full performance test of smart meters randomly sampled before arrival. Each tested watt hour meter needs to pass more than 60 inspections within a month before it can be determined to supply in large quantities."

subsequently, witnessed the climate and environmental impact test and error closely related to the daily use of smart meters, and the aviation industry is accepting the thermoplastic composite test. In the climate environment impact test, the testers successively placed the smart meter in the simulated environment of high temperature, low temperature, sunlight radiation, rain and so on to test its reliability under the influence of harsh environment. Yan Jingjing said, "the working environment of the electric energy meter set during the test has a maximum temperature of 70 ℃ and a minimum temperature of -25 ℃. The severity of the environment is much higher than the actual working environment of the electric energy meter. Users can rest assured." In the error test, no matter which component is tested, it needs to be emptied with a drill in advance. The inspection equipment displays the measurement error of the electric energy meter when different currents are input in real time, and the change of the error is always kept within ± 0.6%, which is far lower than the ± 2% required by the national standard

after passing the full performance test, the smart meter can be supplied. Random sampling inspection after arrival is the second key to ensure the quality of electric energy meters. There are a total of more than 20 inspection items, which simplify the manufacturing and reduce the total cost. After passing the sampling acceptance, enter the last pass - full inspection and acceptance test, that is, to conduct full inspection of the arrived smart meters. If the acceptance rate of full inspection is less than 99% or there are three or more samples with the same quality hidden danger, batch return will be carried out