Specifications

February 2007
16-34
For more information visit: www.eaton.com CA08101001E
Transfer Switches
16
Transfer Switch Equipment
ATC-800 Closed Transition IQ Transfer Controller
ATC-800
Closed Transition IQ Transfer Controller
ATC-800
Product Description
The Closed Transition IQ Transfer [CTIQ
Transfer (ATC-800)] is a programmable,
microprocessor-based monitoring
device designed for use in Eaton Closed
Transition Transfer Switches (CTVI/
CBVI). By using the Eaton CTIQ Transfer
(ATC-800), the user may avoid inten-
tional 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 pre-
determined transfer to the generator is
desired. Source paralleling duration is
limited to less than 100 msec.
Passive Closed Transition
The Closed Transition mode of opera-
tion requires that both power sources
be synchronized in voltage, frequency
and phase angle within prescribed
limits. Eaton’s CTIQ Transfer (ATC-800)
utilizes 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 assure optimal closure of
the two sources in-phase.
The Eaton Closed Transition IQ Transfer
(ATC-800) must be selected with one
of two feature sets: 47C or 47D. The
difference between these two feature
sets is the action taken by the CTIQ
Transfer (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. However,
if Feature set 47D is selected, failure to
synchronize will result in the CTIQ
Transfer (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 synchroniza-
tion is not achieved.
Application Description
■ The generator used with a closed
transition transfer switch must be
equipped with an isochronous
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.
Switch Application Section
Eaton Closed Transition IQ Transfer
(ATC-800) Features
The CTIQ Transfer (ATC-800) is a door-
mounted, totally enclosed device that
is customer accessible from the transfer
switch front panel.
Data access and programming opera-
tions are performed using the CTIQ
(ATC-800) Transfer’s touch-sensitive
function buttons in conjunction with
an easy-to-read, illuminated, alphanu-
meric LED display. Both the function
buttons and the display window are part
of the device’s front panel. A built-in
Help button provides user assistance
in the form of message displays.
The CTIQ Transfer (ATC-800) is com-
munications ready and compatible
with all Eaton IQ devices as well as the
Eaton PowerNet system-wide supervi-
sory and control software. This permits
monitoring and control of several
transfer switches, locally or remotely,
from a single point.
Features, Benefits and
Functions
Additional Features
■ Source paralleling duration is
limited to 100 msec or less.
■ Applicable for use on any low or
medium voltage application through
38 kV.
■ True rms three-phase voltage sens-
ing on Normal, Source 2 and Load.
■ Frequency sensing on Normal and
Source 2.
■ Programmable set points stored
in non-volatile memory.
■ PowerNet Communication to
personal computer either on-site
or remote.
■ Historical data on most recent trans-
fers (up to 16 events) viewable at
switch. Unlimited history storage
(remote) available when used with
PowerNet software.
■ Wide range of user-selectable
option combinations.
■ Load sequencing.
■ Engine start contacts.
■ Engine Test Switch with user-
selectable Test Mode and Fail-Safe.
■ Alarm contact (multiple alarm
functions available).
■ Pre-transfer signal.
■ Heartbeat Monitor (flashing green
Automatic light signifies that the
CTIQ Transfer (ATC-800) is operating
properly).
■ Instrumentation:
– Voltmeter (Accuracy ± 1%)
– Reads line-to-line on Sources 1
and 2 and Load
– Frequency Meter (40 – 80 Hz,
accuracy ± .1 Hz)
– Source Available Time
(both sources)
– Source Connected Time
(both sources)
– Source Run Time
ATC-800 Programming
Button Functions
Three buttons provide easy access
to all commonly used CTIQ Transfer
(ATC-800) functions.
When the preferred source is connected
and the ATS is operating normally, the
Automatic indicator light will be flashing
and the display window will be blank.
Using the Display Select button, the
operator can step through each of the
six display families:
■ Source 1.
■ Source 2.
■ Load.
■ History.
■ Time/Date.
■ Set Points.
Note: Stepping through the various display
modes does not alter preset values or other-
wise affect operation of the ATS.