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Instruction Manual
RGU-10A, RGU-100A
4. OPERATION
4.1 - PRINCIPLE OF OPERATION
The RGU-10A /RGU-100A is a type-A ultraimmunised earth leakage protection and monitoring relay
that is compatible with the earth leakage transformers in the WGC range.
The device measures, calculates and displays the residual current of balanced or unbalanced three-
phase industrial networks. The measurement is a true RMS value, taken by using a residual current
input from an external measurement toroidal transformer of the WGC series.
The RGU-10A /RGU-100A can be used to program and adjust all the parameters required to obtain
complete protection and control of the installation.
In normal operating conditions, the main values that determine the residual current protection of the
installation, such as sensitivity, delay and instantaneous leakage current, are shown on the display.
In normal operating conditions, the display is shown in White, Blue if in configuration mode, Yellow
if the pre-alarm has tripped, or Red for any event that causes a trip of the main relay, showing the
reason.
Main characteristics:
True root mean square value.
Ultra-immunised type A differential.
Immunity to transients.
Filtering of the highest order high frequencies.
Trip adjustment between 80 and 100% In.
Inverse curve.
4.2 - LED INDICATORS
The RGU-10A /RGU-100A device has 2 LEDs:
- CPU, indicates that the device is on.
- STATE, indicates the device status, see Table 6.
Table 6: State LED.
LED Backlight Description
Fast
blinking
OFF Device processing the signal.
Slow
blinking
Yellow Pre-alarm relay trip.
ON Network
Deive triped due to leakage, transformer error, external
trip or TEST of the trip relay.
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