The eddy current loss is the power absorbed by a magnetic material due to eddy currents, which are loops of electrical current induced within material by a changing magnetic field, due to Faraday's law of induction.They are caused by the enclosed area within the hysteresis cycle, shown on the figure below.Ĭore losses are combination of eddy current and hysteresis losses. The magnetic material and core design as well as the spectral contents of the current amplitude versus frequency define the level of core losses. Different values can be computed depending on your application conditions (ambient temperature, power supply voltage tolerances and maximum current/voltage to be measured). In case you need values out of the range specified on the datasheet of the transducer, please contact your technical support. power supply voltage will be determining for the calculation). Connecting a higher resistor than the one specified will reduce the measurement range of the transducer (min. It corresponds to the resistor which will not lead to the electrical saturation. The maximum resistor value is set to allow a defined current / voltage measurement range for the transducer.This can be 0 Ω for some transducer types (the maximum power supply voltage will be determining for the calculation). The minimum resistor value is set for thermal protection of the output power stage of the transducer.The measuring resistor has to be within a defined range to allow a safe and optimum operation of the transducer. How is “primary nominal” rms current or voltage determined?.description of the environmental conditions, graph of the waveforms to be measured, nearby potentially disturbing elements such as inductors, current carrying conductors and the presence of magnetic materials or the location of other transducers). If this is not feasible, please provide LEM with a diagram of your installation and a detailed description of the transducer operating conditions (e.g. Obviously the best scenario is to perform tests in the specific application environment. compliance with specific standards, etc.special isolation or partial discharge requirements.mechanical disturbances (vibration, shock, etc.).significant common mode voltage transients ( dv/dt).Some applications have a higher level of complexity and combine several potentially critical elements such as: Environmental conditions, including vibration, operating temperature range and proximity of other conductors or magnetic fields.Thermal conditions, including current profile versus time, maximum RMS measurement, thermal resistances and cooling.Mechanical requirements, including aperture size, overall dimensions, mass, materials, mounting and vibration.
Electrical requirements, including power supply requirements, peak measurement, response time, di/dt and dv/dt.Take into account all aspects of the applicationĪll aspects of an application must be taken into account for the selection of the transducer and system design, with particular attention to the following:
0 kommentar(er)
