By Steve Bush 2nd July 2020
LEM is aiming at rail traction and industrial applications with a series of isolated voltage sensors for ac, dc and pulsed use.
DVC 1000 series sensors are panel-mount and measure 29 x 51 x 89mm – 131.6cm3– and 57g. A DIN rail mounting adaptor is an option.
“LEM developed the DVC 1000 to be compliant with the International Railway Industry Standards [IRIS],” said the company. “The series uses an isolating amplifier with a safety insulation voltage of 4.2kV. The use of an isolating amplifier offers significant space savings over other sensors of similar capacity, which use galvanic insulation.”
Output is +/-30mA (DVC 1000) or +/-10V (DVC 1000-B) at +/-1500V peak. DVC 1000-UI is unipolar (0 to 1kVdc) with a 4-20mA current output. Measurement -3dB frequency is 35kHz. Response is in 12 to 17 µs at 90% of nominal voltage.
All models are specified to be +/-1% accurate at +25°C and +/-1.7% over -40°C to +85°C.
No primary power supply is needed. On the secondary side, consumption is 12 to 22 mA from dual +/-15 to +/-24V rails for DVC 1000 and DVC 1000-B models, or a single +15 to +24V for the unipolar DVC 1000-UI.
Materials comply with “all relevant fire and smoke requirements, EN 45545, mandatory in railway applications”, said LEM. “They are CE marked and are supplied with a five-year warranty, as are all LEM sensors.”
Expected applications include dc links in railway rolling stock and sub-stations, as well as the outputs of inverters, the input voltage of four-quadrant converters or the batteries of light rail vehicles. Away from railways, use is foreseen in DC power supply monitoring, electric vehicle chargers and battery storage.
The product page is here
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