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.
Smart Meter System Design in Smart Grid Advanced Metering Infrastructure AMI
In the development of smart grid,smart meters get unprecedented attention.Smart meters can show not only electricity consumption,but also energy prices,which will promote a new way of consumption and lifestyle.Electricity users are the largest user group in China’s Electric Instruments,with 90% demands of the total market.Smart meters are the largest future output products in China’s Electric Instruments.This paper outlined the development of smart meters,then introduced smart meters’hardware and software design and low-power design method,taking Maxim's MAXQ3180 as the example and using ST’s ARMembedded controller STM32F107 as the host,and finally expatiated the anti-tamper technology of smart meters in detail.
Concentrated solar energy in materials processing
Solar energy, which is available in abundant in nature, is least utilised. As per primary energy product, solar energy conversion can be of three different ways: solar fuels, solar electricity, and solar thermal systems. These three approaches are presently not being fully utilised. Concentrated solar energy (CSE) is an alternative to other types of energy for modifying the surfaces of metallic materials. Attempt has been made to overview the current status of CSE in materials processing technology. In this paper, applications of CSE through solar furnace and Fresnel lens for hardening, coatings, sintering, nitriding, synthesis and welding are discussed.