An anti-power theft method for secondary circuit of energy meter current transformer
At present, power theft ways become increasingly subtle and intelligent. Power theft not only has caused a great loss to the nation and the power sector, but also has brought serious security risks to the equipment and personal health. Although the power theft behavior of the energy meter voltage transformer secondary circuit has been well recognized and effectively suppressed, the anti power theft method for the secondary circuit of the energy meter current transformer is still a weak link. Therefore, this paper proposes a transient method based anti power theft method for the secondary circuit of the energy meter current transformer. This method applied the pulse signal to the secondary circuit of the energy meter current transformer first, then obtained the equivalent resistance and inductance parameter of the circuit by measuring the transient value of the circuit response current. Comparing these parameters with the original parameters of the circuit, we can judge the circuit state and power theft way. The simulation results verify the accuracy and reliability of the proposed method, which is a new anti power theft method of the energy meter.
Reliability prediction of smart electrical energy meter
Reliability prediction is an important technique to improve the inherent reliability of smart electrical energy meters and its key is to select the appropriate reliability prediction handbook.The characteristics and limitations of a few prediction handbooks are analyzed and it is pointed out that,according to the inherent characteristics of smart electrical energy meter and its requirement for reliability prediction,Telcordia SR-332 is at present the most practical handbook with great theoretical and engineering values.The reliability of smart electrical energy meter is predicted with the chosen handbook and the predictive results are compared among several kinds of smart electrical energy meter,according to which,some measures for improving the reliability of smart electrical energy meters are given.
The role of forensic epidemiology in evidence-based forensic medical practice
Objectives This thesis is based on 4 papers that were all written with the same intent, which was to describe and demonstrate how epidemiologic concepts and data can serve as a basis for improved v ...