Contact Outputs; Latching Outputs - GE T35 Instruction Manual

5.7 INPUTS/OUTPUTS
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PATH: SETTINGS INPUTS/OUTPUTS
# 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.
EXAMPLE:
The trip circuit current is monitored by providing a current threshold detector in series with some Form-A contacts (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
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flag; e.g. '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 UR using the 'Cont Op 1 IOn' FlexLogic™ operand to seal-in the Contact Output as follows:
CONTACT OUTPUT H1 ID:
OUTPUT H1 OPERATE:
OUTPUT H1 SEAL-IN:
CONTACT OUTPUT H1 EVENTS:
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PATH: SETTINGS INPUTS/OUTPUTS
# LATCHING
# OUTPUT H1a
5-98
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CONTACT OUTPUTS

CONTACT OUTPUT H1 ID
Cont Op 1
OUTPUT H1 OPERATE:
MESSAGE
Off
OUTPUT H1 SEAL-IN:
MESSAGE
Off
CONTACT OUTPUT H1
MESSAGE
EVENTS: Enabled
"Cont Op 1"
any suitable FlexLogic™ operand
"Cont Op 1 IOn"
"Enabled"
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LATCHING OUTPUTS

OUTPUT H1a ID
L-Cont Op 1
OUTPUT H1a OPERATE:
MESSAGE
Off
OUTPUT H1a RESET:
MESSAGE
Off
OUTPUT H1a TYPE:
MESSAGE
Operate-dominant
OUTPUT H1a EVENTS:
MESSAGE
Disabled
T35 Transformer Management Relay
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CONTACT OUTPUT H1
Range: Up to 12 alphanumeric characters
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Disabled, Enabled
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LATCHING OUTPUT H1a
Range: Up to 12 alphanumeric characters
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Operate-dominant, Reset-dominant
Range: Disabled, Enabled
5 SETTINGS
5.7.3 CONTACT OUTPUTS
5.7.4 LATCHING OUTPUTS
GE Multilin