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Flicker compliance tests for mains-connected appliances rely on a power source and reference impedance network that simulates the mains supply. Assessment of an appliance is achieved by measuring the flicker induced on the power source output by the appliance, which is dependent on the output impedance of the power source and reference impedance network. The value of this output impedance and its...
The paper deals with the modeling method of the power transformers (three phases) used in the railway substation. In order to propose a high frequency model, which will be valid in the frequency band varying from 10 kHz to 30 MHz, it is necessary to identify the various impedances with a good accuracy. Often, these impedances are measured with an impedance analyzer, but for high power transformers,...
This paper deals with the approximate worst-case test method for testing the insertion loss of the EMI filters. The systems with 0.1 Ω and 100 Ω impedances are usually used for this testing. These measuring systems are required by the international CISPR 17 standard. The main disadvantage of this system is the 0.1 Ω impedance transformer. The dynamic range for the transformation from the 50 Ω, which...
Broadband power line communication (PLC) technologies represent a main factor of the development of the digital convergence voice-data-video in the home environment. Such technologies use the power line network as a propagation and a communication medium which quality depends mainly on the power grid topology, but also on the connected household electrical appliances which impedances have a great...
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