Contact Outputs - GE T35 Instruction Manual

5.8 INPUTS AND OUTPUTS
a) DIGITAL 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
operand (virtual output, element state, contact input, or virtual input). An additional FlexLogic™ operand may be used to
the relay. Any change of state of a contact output can be logged as an Event if programmed to do so.
SEAL-IN
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
5
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 T35 using the
CONTACT OUTPUT H1 ID:
OUTPUT H1 OPERATE:
OUTPUT H1 SEAL-IN:
CONTACT OUTPUT H1 EVENTS:
b) LATCHING OUTPUTS
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PATH: SETTINGS INPUTS/OUTPUTS
 CONTACT OUTPUT H1a

The T35 latching output contacts are mechanically bi-stable and controlled by two separate (open and close) coils. As such
they retain their position even if the relay is not powered up. The relay recognizes all latching output contact cards and pop-
ulates the setting menu accordingly. On power up, the relay reads positions of the latching contacts from the hardware
before executing any other functions of the relay (such as protection and control features or FlexLogic™).
The latching output modules, either as a part of the relay or as individual modules, are shipped from the factory with all
latching contacts opened. It is highly recommended to double-check the programming and positions of the latching con-
tacts when replacing a module.
5-146
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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 ION
"Cont Op 1"
any suitable FlexLogic™ operand
"Cont Op 1 IOn"
"Enabled"
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CONTACT 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 Protection System

CONTACT OUTPUT H1
Range: Up to 12 alphanumeric characters
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Disabled, Enabled
a contact output may be any FlexLogic™
OPERATE
FlexLogic™ operand to seal-in the contact output as follows:

CONTACT OUTPUT H1a
Range: Up to 12 alphanumeric characters
Range: FlexLogic™ operand
Range: FlexLogic™ operand
Range: Operate-dominant, Reset-dominant
Range: Disabled, Enabled
5 SETTINGS
5.8.3 CONTACT OUTPUTS
GE Multilin