Lucy Electric GridKey Ltd. products

Using the experience installing over 1000 LV monitoring systems using a variety of sensors types, the GridKey team specified a sensor specifically for retrofit installations. The SlimSensor works on the same principle as a Rogowski (providing a dI/dT output) however does not suffer from the accuracy issues (cross feed from adjacent conductors and positional accuracy of conductor within sensor aperture) typical rope Rogowski sensors suffer from. The sensor is flexible and can be installed single-handed if required due to space constraints.

When required to fit around larger conductors, multiple conductors or around fuse handles, a longer sensor can be supplied. Although available in various lengths the most commonly supplied sensor is approximately 30cm long.

The GridHound sensors were designed by the GridKey team specifically for retrofit to existing LV cabinets and they remain our most accurate sensors. These have been fitted in more than 1000 substations as well as installed in underground joints to monitor mid-point and end-point voltages on the network.

These sensors are supplied with the MCU520MV and measure the current output of 400:5 ratio CT’s fitted to MV cables. The sensors generate 100mV for 5A, which corresponds to 100mV for 400A MV current, i.e. 250µV/A, which is the same output as the standard GH600 Rogowski sensors. An internal voltage setting resistor sets the full scale output voltage to 100mV – this resistor also serves as open circuit shock protection for the installer.