Start-Up Threshold "Gext; Zone Selectivity "Gext; Residual Current Protection Rc; Protection "U - ABB Tmax T7 Operating Instructions Manual

Protection Gext possesses the same adjustment characteristics as protection G and is controlled differently by protection releases
PR332/P and PR333/P:
- PR332/P: only one protection can be set: if both are enabled, activation of Gext excludes G.
- PR333/P: available at the same time. Activation of Gext does not exclude G.
WARNING: The external toroid must be connected to the protection release by means of a corded shielded
two-wire cable (e.g. BELDEN 3105A two-wire cable) no more than 15 m in length. The shield must be earthed on
both the circuit-breaker side and toroid side.
IThe protection is not available with release PR332/P MM.
It is indispensable for the star center to be connected openly to earth and for it not to be used as a neutral conductor too (as in
the TNC system), making a protection according to the TT system.
3.6.9.1.

Start-up threshold "Gext"

The function behaves in exactly the same way as the protection "S"
3.6.9.2.

Zone selectivity "Gext"

The function behaves in exactly the same way as the protection "S".
In addition, zone selectivity Gext is controlled differently by protection releases PR332/P and PR333/P:
- PR332/P: similarly to the protection, one single selectivity can be set, either G or Gext. If both are enabled, activation of Gext
excludes G.
- PR333/P: selectivity G and Gext are available at the same time. Activation of Gext does not exclude G.
WARNING: With PR333/P and if both selectivity G and Gext are activated, input K51/GZin and output K51/GZout
are shared: the commands and time settings are determined by the settings of the 2 selectivity options and just
one of the two need be activated in order to activate the inputs and outputs (e.g.: output K51/GZout is activated
if the fault current exceeds one of the two protection thresholds).

3.6.10. Residual current protection Rc

Protection Rc provides protection against earth faults of the residual current type.
The protection, which can be adjusted, allows the operating threshold and non-trip time settings to be made (the trip fails to occur
if the alarm terminates within the set time).
The presence of sensor Rc must be activated via the menu, in the Settings-Circuit-breaker-Earth Protection section.
WARNING: It is essential to enable the protection after the dedicated rating plug has been installed and with
module PR330/V connected to the protection release.
he function is available with releases PR332/P (versions LSIG and LSIRc) and releases PR333/P (version LSIG) and only in the
presence of:
- module PR330/V
- external sensor Rc
- dedicated rating plug for residual current protection.
Rating plugs for residual current protection have a different label from the ordinary model, indicating the sensitivity range and
non-trip time settings that characterize the function.
The protection is controlled differently by PR332/P and PR333/P:
- PR332/P LSIG: only one protection can be set, either Rc or G: if both are enabled, activation of Rc excludes G.
- PR333/P LSIG: available at the same time. Activation of Rc does not exclude G.
Instructions on how to put the configuration with sensor Rc into service are available in par. 1.12.7.
Details about the sensory chain test with Rc are available in par. 1.11.3.

3.6.11. Protection "U"

The excludable fixed time protection allows phase voltage or current unbalance to be monitored.
Voltage unbalance can only be monitored if module PR330/V is installed.
This fixed time, excludable protection trips when, for the t6 time setting or longer, an unbalance is detected between two or more
phases that is higher than the I6 threshold setting.
B0431
Mod.
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Apparatus
Emax X1-Tmax T7-Tmax T8
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