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–8–
M-3410A Intertie/Generator Protection Relay
Sensing Inputs
3 Voltage Inputs: Rated nominal voltage of 69 V ac to 480 V ac, 60 Hz (50 Hz user configurable). Will
withstand 600 V continuous voltage. Source voltages may be line-to-ground or line-to-line connected. Phase
sequence ABC/ACB is selectable. Voltage transformer burden less than 0.25 VA at 120 V ac.
3 Current Inputs: Rated current (I
R
) of 5.0 A or 1.0 A, 60 Hz (50 Hz user configurable). Will withstand 2 I
R
continuous current and 30 I
R
for 2 seconds. Current transformer burden is less than 0.75 VA at 5 A for 5 A inputs,
0.3 VA at 1 A for 1 A inputs.
Control/Status Inputs
The control/status inputs, INPUT1 and INPUT2, can be programmed to block any of the M-3410A functions
and trigger the oscillograph recorder. The control/status inputs accept only dry contacts and are internally
wetted (9 V dc) by the relay's power supply. A minimum current of 1.3 mA is required to avoid spurious
triggering of the input.
Output Contacts
The two programmable output relays, each with a contact are rated as per ANSI/IEEE C37.90-1989 for
tripping: make 30 A for 0.2 seconds. Available hardware configurations include two normally open (Option
B1), one normally open and one normally closed (Option B2), or two normally closed (Option B3) contacts.
The contacts will carry 8 A, break 6 A at 120 V ac, break 0.1 A at 125 V dc, inductive break 0.1 A. Also
provided is a self-test alarm output contact (form 'c') with a rating of 8 A at 120 V ac, 5 A at 30 V dc, 125 V
dc 0.15 A resistive, 0.1 A inductive.
Any of the M-3410A protective functions can be individually programmed to activate the two programmable
outputs. The user can configure the two programmable outputs to either energize or de-energize to issue an
output command.
The outputs (excluding the self-test) can have two modes of operation, LATCHING and NORMAL. The
LATCHING mode requires an operator intervention to deactivate the outputs after the condition for operation
has been removed. In the NORMAL mode, when the condition for tripping has been removed, the output(s)
will deactivate automatically after the corresponding seal-in timers have expired.
Target/Status Indicators and Controls
The RELAY OK LED reveals proper cycling of the microprocessor. The DIAGNOSTIC LED provides
indication of the error code (when flashing). The OSC TRIGGER LED indicates that the oscillograph has been
triggered. The remaining eleven LEDs are used to indicate which protective function(s) have been tripped.
OUTPUT 1 and OUTPUT 2 are used to indicate the status of the output contacts. The output LEDs will
illuminate when the output contact relays are tripped. The TARGET/OUTPUT RESET button resets the
target LEDs if the conditions causing the operation have been removed. Holding the TARGET/OUTPUT
RESET button displays the present pickup status of the M-3410A functions. The TARGET/OUTPUT RESET
button will deactivate the tripped output contact if the LATCHING mode was selected. (If the seal in timer
has already expired, the output contact will deactivate immediately.)
Communication
Communications ports include a front panel RS-232 port and a rear port user configurable to RS-232 or RS-
485. The RS-232 ports are connected physically with a DB-9 connector and the RS-485 port utilizes 4-wire
interface mounting screw terminals.
M-3810A IPScom
®
For Windows
TM
or M-3811A IPScom For Palm OS
®
Communications Software utilizing
the MODBUS communications protocol in RTU mode, implements serial, byte-oriented asynchronous
communication with the M-3410A and provides the following functions:
•
Interrogation and modification of setpoints
•
Time-stamped sequence of events information for the 32 most recent events
•
Real-time metering of all quantities measured
•
Downloading of recorded oscillographic data
•
Relay Setup
Summary of Contents for Syncrocloser M-3410A
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