1、Current Transformers fo Smart Grid applications
（1）What is a smart grid?
Everyone is talking about the concept of the smart grid, but the actual definition is still fluid. The Department of Energy notes that the smart grid will be an automated, widely distributed energy delivery network, characterized by a two-way flow of electricity and information and able to monitor everything from power plants to customer preferences to individual appliances.
Fig illustrates the fact that the smart grid concept ties together all aspects of the power system, from the plug in the wall at a house or office,to a factory, to the distribution system, to power plants of all kinds.
The increasing demand for smart system in new, modern smart grids requires highly qualified and reliable current transducer technologies. The main question is, whether or not the current transducers are able to meet all requirements from the consumer side, from the energy supplier side and the metrology?
Consumers are mainly looking for actual consumption measurement, transparency of energy demand and energy savings without any doubts, Energy suppliers are looking for tamper-proof metering, secure remote readout and an increased accuracy for efficient data collection, control and billing, The metrology bodies have to consolidate all needs and in line with the standards, to insure long lasting quality of the energy measurement to avoid financial losses for distributors and consumers of electric energy.
A highly developed transducer principle such as the current transformer is an innovative technology and helps to ensure a consistently a high quality level on all the mentioned “user sides” explained above.
（3）Where is the current transformer used in for Smart Grid?
A : Smart Meter – CT with DC-Tolerance or without DC-Tolerance (AST, ASD, ASM-Series)
B : Household Appliances – CT without DC-Tolerance (AST-Series)(air conditioner, refrigerator, washing machine, electric heater, etc)
2、Amotech Current Transformers for Electronic Watthour Meters
CT : current transformer
VD : voltage divider
A : analog signal processing block
F : analog electronic filter
S&H : sample and hold
A/D : analog-to-digital converter
DSP : digital signal processor
D : display
DMA : direct memory access circuit
M : memory
μ P : microprocessor, CPU