For the rollout business case, the reliability aspect of the installed meters is a very important parameter. manage metering assets effectively, it is vital that tools are available for estimating life characteristics of the meters to be installed. One such tool is the IEC standard 62059-31-1 for accelerated reliability testing.
Testing in accordance with IEC 62059-31-1
It is practically impossible to obtain data about life characteristics by testing under normal operating conditions. Therefore, IEC 62059-31-1 provides a method for estimating life characteristics using temperature and humidity accelerated testing.
During this accelerated reliability testing, samples taken from a defined population are operated beyond their normal operating conditions, applying stresses to reduce the time to failure, but without introducing new failure mechanisms.
The estimation is performed by recording and analyzing failures during such accelerated testing, establishing the failure distribution under the test conditions and, using life stress models, extrapolating the failure distribution under accelerated conditions of use to normal conditions of use.
The method provides quantitative results with their confidence limits, and may be used to compare life characteristics of different products.
Testing at NMi
NMi offers full testing in accordance with IEC 62059-31-1. According to this standard, batches of, for example, 30 electricity meters are examined under several different stress conditions (elevated temperature and humidity). During the tests, several different aspects of the meters can be observed, such as their accuracy, registration details, the functioning of the display and communication. For these aspects the failure distribution is extrapolated in order to estimate the meters behaviour under normal conditions of use.
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