NRG Product Manual
Hybrid XT Vane
HybridXT_Vane_Manual
Rev 13.0
[email protected] | Page 17
7 February 2017
about preventing ground loops. NRG Systems supplied cables provide a shield at the sensor end. If
your LPS design does not use this shield drain, trim it off to prevent short circuits.
5.
Run the sensor cabling in metallic raceway or conduit. Bond the raceway or conduit to the LPS at
both ends. This provides protection for the sensor and cabling against EMI and LEMP.
The purpose of recommendations 1 through 5 is to provide shielding of the internal sensor electronics,
heater, and cabling so that they are protected to LPZ 1, per IEC 61400-24.
Recommendations 6 and 7 relate to ground loops and over-voltage protection.
6.
Provide sufficient bonding to prevent ground loop currents in the shields and raceways. Whenever
possible, it is better to resolve the underlying grounding problems, rather than leaving the shield
unconnected to prevent ground loop current flow.
7.
Since the sensor's electronics and cabling are in LPZ 1, isolation and or over-voltage protection
should be provided at the interface between the sensor cabling and turbine control system to
provide LPZ 2 or better protection for the controller.
Sensor Construction Notes
The Hybrid XT™ turbine control sensor’s enclosure is metal, which provides an overall EMI shield for the
internal components of the sensor. The sensor includes internal over-voltage protection (OVP)
components. For these features to be effective, the sensor must be installed and connected properly.
Figure 3 shows the internal connection details of the sensor bonding and OVP.
The direction vane is shown as an example; the anemometer uses the same construction.
