NGVS Medium Voltage Sensor

The NGVS Medium Voltage Sensor is a high performance all optical sensor for distribution voltages to 36 kV. 

PERFORMANCE
Bandwidth to faithfully reproduce harmonics and transients. 
 
ALL OPTICAL
Passive optics at line potential with complete galvanic  isolation between instrumentation and high voltage environment.
 
ANALOG & DIGITAL
Low energy analog output, as well as digital 61850-9-2 and synchrophasor outputs.
  • Passive optical primary sensor with no electronics at line potential for long-term reliability and stability
  • Class 0.5 accuracy with excellent frequency response.  6 kHz bandwidth standard; up to 100 kHz available
  • Versatile digital platform with merging unit output and available voltage synchrophasors
  • On-board D/A converter gives analog output for ease of interface to legacy instrumentation system
NGVS Datasheet
File Size: 1277 kb
File Type: pdf
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Picture

​In a typical monitoring application for a distributed energy resource, the primary sensor is pole-mounted and attached to the line and then connected via optical fiber to the secondary converter.  The primary sensor is completely passive and the optical fiber provides isolation between the electronics and the high voltage environment.  The low voltage analog (or digital) output is then connected to a power quality meter or data acquisition device.  
Picture

​Here a set of NGVS optical sensors is installed on a distribution feeder near a solar photovoltaic farm.     Any slight errors in conversion switching timing can create harmonics which can be difficult to detect with conventional instrument transformers.
Picture

​Secondary converter electronics are mounted away from the sensors at a convenient point which could even be many spans away from the primary sensor.  The output is a low energy analog voltage or digital signal which can be connected to a data acquisition system or power quality meter. Power input is 24 Vdc.  Custom powering, cable length, and enclosure options can be specified at the time of order.  
Picture
The NGVS has a 3 dB bandwidth in excess of 200 kHz allowing observation of harmonics and super-harmonics.  Here we show frequency content up to 12 kHz. This chart effectively shows the Fourier transform of 0.5 seconds of waveform data, acquired at 1 mega-samples-per-second (in this case down-sampled to 30,000 samples-per-second before spectrum analysis).  The primary (60 Hz) amplitude is about 7.3 kVrms (close to the rated line-to-ground voltage for a 12 kV system), and the noise level is below 0.3 V (i.e., harmonics with magnitude more than 0.01% of rated voltage can be observed).