Electrical Specifications
975-0466-01-01 A–3
Islanding Protection
Adjustable Disconnect Settings
Voltage and frequency disconnect and islanding protection are essential safety
features that ensure no person working on the grid is harmed by a distributed
energy source. Default software settings are programmed into each GT Inverter at
the factory to ensure it does not island according to relevant safety regulations
(AS4777.3 Clause B4) and that out-of-bounds voltage or frequency results in
disconnection as required (AS4777.3 Clause B2 and B3).
In some instances it may be desirable to adjust these default settings. For example,
the GT Inverter may experience nuisance trips (taking the inverter offline) if the
grid is weak and the voltage falls outside the allowable range specified in the
regulations. With permission from the utility, the factory settings may be changed
to allow the GT inverter to operate over a wider grid voltage range.
The utility disconnect settings are password protected and should only be changed
by qualified service personnel, using the Xantrex GTConfigLite software tool. For
more information about installing and using GTConfigLite, see the GTConfigLite
User’s Guide, available with the software.
Default Utility Disconnect Settings and Adjustment Ranges
Requirement AS4777.3 Clause B4
Type Active rate-of-change of voltage
Setting Default Min Max
Phase-to-Phase (rms) High Threshold Voltage 265.00 230.00 270.00
Phase-to-Phase (rms) Reconnect Voltage 265.00 230.00 270.00
Phase-to-Phase (rms) Low Threshold Voltage 203.00 200.00 230.00
Voltage (rms) High Clearing Time (ms) 2000 2000 5000
Voltage (rms) Low Clearing Time (ms) 2000 2000 5000
Frequency High Threshold (Hz) 51.00 50.00 55.00
Frequency Low Threshold (Hz) 48.00 45.00 50.00
Frequency High Clearing Time (ms) 2000 2000 10100
Frequency Low Clearing Time (ms) 2000 2000 10100
Reconnect Delay (ms) 60000 10000 305000
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