Introduction
1–16
153378
Safety Features
Anti-Island Protection
A condition referred to as "Islanding" occurs when a distributed generation source
(such as the GT100 Grid-tied Photovoltaic Inverter) continues to energize a
portion of the utility grid after the utility experiences an interruption in service.
This type of condition may compromise personnel safety, restoration of service,
and equipment reliability.
The GT100 employs a method for detecting the islanding condition using a Phase-
Shift-Loop (PSL). This method is implemented in the CCU2 to prevent islanding
of the GT100. The CCU2 continuously makes minor adjustments to the power
factor phase angle above and below unity. In the event of a utility interruption or
outage, these adjustments destabilize the feedback between the inverter and the
remaining load, resulting in an over/under frequency or voltage condition.
Upon detection of such a condition, the GT100 then performs an immediate
orderly shutdown and opens both the main AC and DC contactors. The fault
condition will remain latched until the utility voltage and frequency have returned
to normal for at least 5 minutes.
This method has been extensively tested and proven to exceed the requirements of
IEEE-929 (Recommended Practices for Utility Interface of Photovoltaic [PV]
Systems) and UL 1741 (Static Inverters and Converters for use in Independent
Power Systems).
PV Ground Fault Detection
The GT100 is equipped with a PV Ground Fault Detection and Interruption
circuit. The circuit employs a 4 A fuse between TB4 and TB5 (PV GND). If
sufficient ground current clears the fuse, and auxiliary contact will signal the
GT100 to execute an immediate orderly shutdown, open both the AC and DC
contactors and report a PV Ground on the VFD of the UFCU. The GT100 will
remain faulted until the fault is remedied, the fuse is replaced, and the advisory is
cleared at the operator interface.
DC Over-voltage Detection
In the event of DC voltage greater than 600 Vdc, the GT100 will execute an
orderly shutdown and will report a PV over-voltage fault on the VFD of the
UFCU. If the DC voltage remains greater than 600 Vdc, the GT100 may be
irreparably damaged.
See Chapter 4, “Troubleshooting” for further information on this fault condition.
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