• Before powering up the device, make sure that the protective earth is properly connected. The
ground connection must be made using the appropriate bolt on the right side of the metal
container. The failure to connect the protective earth may cause a safety hazard.
SUMMARY
The fault detector RGDAT-A70 for outdoor installation is made according to technical specification
GSTP001 by ENEL; it is installed on pole where are installed driven switch or recloser in order to
provide local and remote signaling of short circuit faults and ground faults that may occur in medium
voltage distribution network, as well as to signal the absence of line voltage. This information can help
to locate the section of the network affected by fault.
The voltage and current measurements are obtained by 3 combined sensors (one for each phase).
The voltage measurements are used for directional earth fault function and to detect the presence/
absence of line voltage; values of phase voltage V4, V8 and V12 are processed in order to eliminate
measurement errors caused by combined sensors using the voltage inputs calibration function.
The device RGDAT-A70 uses current measurement to detect phase faults producing a current greater
than a threshold value and ground faults both in isolated neutral networks and in compensated neutral
networks.
The device RGDAT-A70 implements the following protection / functions:
voltage presence function
positive sequence undervoltage
negative sequence overvoltage
voltage sensors supervision function
There are 3 relay outputs, which generally have the following functions:
signals the intervention of short-circuit function for phase faults
(polyphase or double single-phase to ground)
signals the intervention of directional earth fault function for line side
faults (with reverse direction disabled)
managed by voltage presence function
It is also available a different operating mode, called Voltage Monitoring Mode, alternative to the
above indicated functions, in which all protective functions are disabled and only the voltage presence
function is active, but it is managed in a different way (please make reference to document GSTP001
by ENEL).
P515D851 Rev. E November 2019 Pag. 5 of 45
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