developments in renewable energy sources are
driving the growth of distributed generation.
Many Power Distribution Companies are
now encouraging small power producers to
interconnect to the Utility grid. Independent
power producers are typically customers who
install small scale generating units up to 10
MW in size to offset their load and sell excess
power to the local distribution Utility for grid
support and reliable supply.
prevalent, DG interconnection to the Utility
network requires an affordable, reliable,
and high speed solution that can prevent
power from being fed back to the grid during
undesirable situations, such as power line maintenance, electrical
faults, etc. In the event of a fault, the Distributed Generator needs to
disconnect from the grid prior to the reclosing operation of the Utility
Substation breaker.
Generation disconnect from the power grid when the substation
breaker trips open:
working on the feeder, etc.
and innovative Distributed Generation disconnect solution that is
high speed, cost effective, wireless, long range, reliable and secure.
devices available for a wireless transfer trip system.
at the Utility Substation, a second control device between the
substation and the generation site, and a third control device at
each Distributed Generation site. A point-to-multipoint system can
support up to 7 distributed generation sites.
Utility Substation and a second control at the Distributed Generation
site. A point-to-point system supports one remote generation site.
The substation unit is required to transfer trip signals from the Utility
Substation, the downstream control unit is needed to repeat the
Substation trip signal to each DG site, and the DG site control device
is needed to receive the trip signal from the substation and initiate
the disconnect of the local breaker.
at the Utility Substation for transferring
wireless trip signals to remote DG sites (up to
7 sites) and receiving status notification back
from each DG site after a trip operation has
been completed. The transfer trip timing is
30 milliseconds.
control at a recloser site on the distribution
feeder. In this instance, the recloser sends a
trip command to the remote DGT-D unit(s).
The DGT-D then responds by initiating a trip
and sending status confirmation back to the
DGT-U at the recloser site and the DGT-U at
the Substation.
Distributed Generator feeds a faulted grid in the absence of a transfer trip solution.
Wireless network that allows transfer trip from point to multi-point.