Reliability evaluation test method of built-in load switch for electric energy meter

Abstract

The invention discloses a reliability evaluation test method of a built-in load switch for an electric energy meter. The reliability evaluation test method is characterized by including a load switch mechanical reliability and electrical reliability evaluation method. According to the method, a failure rate is adopted as a reliability characteristic parameter, and grading testing is carried out through adopting a fixed event censoring mode. The method includes the following steps that: S01, an allowable failure number Ac and a censoring failure number rc are selected, wherein rc and Ac satisfies a relational expression that rc=Ac+1; S02, the number Tc of times of censoring is obtained according to the allowable failure number Ac and a pre-selected failure rate grade; S03, the number tz of times of test censoring of test pieces is selected; S04, the number n of the test pieces is determined according to Tc, Ac and tz; S05, n test pieces are randomly sampled from products in batch production; S06, test and inspection are carried out according to regulations; S07, a failure number r and the number of times of the test of failed products are calculated; and S08, a test result is judged. The test method of the invention has the advantages of simple operation, accurate detection and the like.

Description

technical field [0001] The invention mainly relates to the technical field of power equipment, in particular to a reliability evaluation test method for a built-in load switch for an electric energy meter. Background technique [0002] The quality of the built-in load switch for electric energy meters is directly related to the quality of customer service and the safety of power grid operation. Since the large-scale construction of low-voltage centralized reading across the country, the State Grid Corporation has a huge volume of calls. Among the repair services for metering faults accepted, the built-in load switch faults for electric energy meters account for a relatively high proportion, accounting for 60% of the total metering fault repairs. According to statistics, in 2014, Hunan Electric Power Company accepted 28,000 repair reports for metering device failures, of which 16,800 were repair reports caused by built-in load switch failures. The quality problems of built-in...

AI Technical Summary

Problems solved by technology

[0003] Through analysis, the operating frequency of the built-in load switch for electric energy meters is relatively low, but it has high requirements for reliability. Generally, the switch will be opened under special circumstances such as user arrears or short circuit, and the switch will be operated after the user's payment is completed or when it returns to normal. brake

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