Date
04/29/2011
PDF
The "Cores and Components" division of Hanau-based VACUUMSCHMELZE GmbH & Co. KG will present a selection of its current sensors at this year's PCIM in Nuremberg from 17th to 19th May. At Stand 130 in Hall 12, VACUUMSCHMELZE will demonstrate its materials expertise in the field of future technologies and clean energy, with products on show including a range of current sensors from its comprehensive portfolio. In addition, Klaus Reichert will hold a presentation entitled "Precision current sensors for high DC and AC by means of the closed loop magnetic probe principle" at the exhibition forum on Thursday, 19 May at 10:00 am in Hall 12. VAC Current sensors are widely used in a range of applications such as solar inverters to monitor the AC output current that is fed into the grid and its DC component. Infrastructure components of electric mobility, such as charging stations, are an upcoming application. Unlike conventional Hall-effect sensors, VACUUMSCHMELZE current sensors use a patented magnetic field probe of Cobalt based-amorphous alloy as a zero-field detector, which offers distinct benefits such as minimal offset current and negligible long-term drift. Since offset current is practically temperature-independent, the current sensors deliver reliable and ultra-precise readings, generally with double the accuracy of Hall-effect sensors, throughout a broad temperature range. VAC's new family of AC-DC-sensitive differential current sensors (DI sensors), form the basis of residual current monitoring units (RCMUs) compliant with the IEC 62109 or UL 1741 VDE 0126 standards. With VAC DI sensors, the use of expensive DC-sensitive (type B) RCDs can be avoided. The operating current, supply and return current conductor and where necessary, external test current are routed through the sensor, which thus records only the current difference, i.e. the residual current, to an accuracy of 1.5% of the maximum safe residual current of 300 mA. Output is a voltage proportional to the differential current. VAC DI sensors offer a range of advanced functions, including sensor core demagnetization which can be triggered by supply voltage or on demand, self-testing with fault signal to detect defects in the magnetic circuit or low supply voltage and self-testing with an internally generated test current. VAC also presents a new Sample Kit containing a range of compact sensors to measure AC and DC current from 2 A to 700 A and peak current up to+/-1200 A. The sensors require either a +5 volt power supply and provide a voltage output or +/- 12 …15 volt power supply with current output. VAC sensors are competitively priced, offer outstanding measuring accuracy (typically 0,2%) and minimal DC offset with very low hysteresis, in addition to near zero temperature dependence and long-term drift. They also feature fast response (typically 0,1 … 0,2 μs) and operate over a wide frequency range of up to 200 kHz. Output noise or periodic signals at zero input are negligible. www.vacuumschmelze.com
