Specifications

Distribution Products Catalog CA08101001E—October 2010 www.eaton.com 81
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16.5
Tr a n s f er Switches
ATC Controllers
ATC-800
Contents
Description Page
Product Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
ATC-100 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
ATC-300 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
ATC-600 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
ATC-800 Transition Controller
Features, Benefits and Functions . . . . . . . . . . . . . . . . . . 82
ATC-800 Transition Controller
Product Description
The ATC-800 is a
programmable,
microprocessor-based
monitoring device designed
for use in Eaton closed
transition transfer switches
and for open transition
contactor-based designs. By
using Eaton’s ATC-800, the
user may avoid intentional
interruption of power when
both sources of power are
available. This make-before-
break mode of operation is
useful during testing of the
engine generator under load
and where a predetermined
transfer to the generator is
desired. Source paralleling
duration is limited to less
than100 msec.
Passive Closed Transition
The closed transition mode
of operation requires that
both power sources be
synchronized in voltage,
frequency and phase angle
within prescribed limits.
Eaton’s ATC-800 uses a
technique that involves
waiting for synchronization
of the two sources without
actively controlling the
generator’s voltage or
frequency. The mode of
operation is anticipatory in that
the switch close command is
initiated before the sources
are exactly in phase. Utilizing
the phase angle and
frequency difference between
the two sources, a calculation
is made to predict when both
sources would be in phase.
The response time of the
switch is then factored in to
determine when the switch
close signal should be given to
ensure optimal closure of the
two sources in phase.
Eaton’s closed transition
ATC-800 must be selected
with one of three feature
sets: 47C, 47D or 47E (47D,
47F, 47G on contactor-based
designs. The difference
between these three feature
sets is the action taken by the
closed transition ATC-800 if it
is determined that the two
sources will not achieve
synchronization. If feature set
47C is selected, failure to
synchronize results in the
switch reverting to an Open
Transition mode of operation
with low voltage decay. If
feature set 47E is selected,
then failure to synchronize
results in the switch reverting
to time delay neutral.
However, if feature set 47D is
selected, failure to synchronize
will result in the ATC-800
refusing to transfer to Source 2
and an alarm signal being
activated. In neither case will
there be a paralleling of
sources if synchronization is
not achieved.
Application Description
●
The generator used with
a closed transition transfer
switch must be equipped
with an isynchronous
governor
●
When paralleling sources,
fault current contributions
from both sources should
be considered in the
system design
●
Closed Transition (make-
before-break) technology
causes paralleling with the
Source 1. It is the user’s
responsibility to comply
with any requirements
regarding protective
relaying. Protective
relaying is not supplied
with the standard transfer
switch, but is available as
an option