GE Multilin
N60 Network Stability and Synchrophasor Measurement System
5-169
5 SETTINGS
5.7 INPUTS/OUTPUTS
5
5.7.3 CONTACT OUTPUTS
a) DIGITAL OUTPUTS
PATH: SETTINGS
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INPUTS/OUTPUTS
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CONTACT OUTPUTS
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CONTACT OUTPUT H1
Upon startup of the relay, the main processor will determine from an assessment of the modules installed in the chassis
which contact outputs are available and present the settings for only these outputs.
An ID may be assigned to each contact output. The signal that can
OPERATE
a contact output may be any FlexLogic™
operand (virtual output, element state, contact input, or virtual input). An additional FlexLogic™ operand may be used to
SEAL-IN
the relay. Any change of state of a contact output can be logged as an Event if programmed to do so.
For example, the trip circuit current is monitored by providing a current threshold detector in series with some Form-A con-
tacts (see the trip circuit example in the
Digital elements
section). The monitor will set a flag (see the specifications for
Form-A). The name of the FlexLogic™ operand set by the monitor, consists of the output relay designation, followed by the
name of the flag; for example,
CONT OP 1 ION
or
CONT OP 1 IOFF
.
In most breaker control circuits, the trip coil is connected in series with a breaker auxiliary contact used to interrupt current
flow after the breaker has tripped, to prevent damage to the less robust initiating contact. This can be done by monitoring
an auxiliary contact on the breaker which opens when the breaker has tripped, but this scheme is subject to incorrect oper-
ation caused by differences in timing between breaker auxiliary contact change-of-state and interruption of current in the
trip circuit. The most dependable protection of the initiating contact is provided by directly measuring current in the tripping
circuit, and using this parameter to control resetting of the initiating relay. This scheme is often called
trip seal-in
.
This can be realized in the N60 using the
CONT OP 1 ION
FlexLogic™ operand to seal-in the contact output as follows:
CONTACT OUTPUT H1 ID:
“Cont Op 1"
OUTPUT H1 OPERATE:
any suitable FlexLogic™ operand
OUTPUT H1 SEAL-IN:
“Cont Op 1 IOn”
CONTACT OUTPUT H1 EVENTS:
“Enabled”
b) LATCHING OUTPUTS
PATH: SETTINGS
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INPUTS/OUTPUTS
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CONTACT OUTPUTS
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CONTACT OUTPUT H1a
CONTACT OUTPUT H1
CONTACT OUTPUT H1 ID
Cont Op 1
Range: Up to 12 alphanumeric characters
MESSAGE
OUTPUT H1 OPERATE:
Off
Range: FlexLogic™ operand
MESSAGE
OUTPUT H1 SEAL-IN:
Off
Range: FlexLogic™ operand
MESSAGE
CONTACT OUTPUT H1
EVENTS: Enabled
Range: Disabled, Enabled
CONTACT OUTPUT H1a
OUTPUT H1a ID
L-Cont Op 1
Range: Up to 12 alphanumeric characters
MESSAGE
OUTPUT H1a OPERATE:
Off
Range: FlexLogic™ operand
MESSAGE
OUTPUT H1a RESET:
Off
Range: FlexLogic™ operand
MESSAGE
OUTPUT H1a TYPE:
Operate-dominant
Range: Operate-dominant, Reset-dominant
MESSAGE
OUTPUT H1a EVENTS:
Disabled
Range: Disabled, Enabled
