GE D90 Plus Instruction Manual page 527

CHAPTER 10: DIGITAL FAULT RECORDER
Transient recorder digital channels
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Up to 128 digital channels may be assigned to the transient recorder. Each channel may be
individually configured by clicking the digital channels Select button in the transient
recorder window to open the transient recorder digital channels window.
Figure 446: Digital channel configuration settings
The following settings are available for each digital channel.
Signals
Range: any FlexLogic™ operand or shared operand
Default: OFF
This setting specifies an operand to use as a transient recorder digital channel. The pull-
down list of available signals is populated with enabled protection functions. Selected
operands will be automatically assigned as channels and as triggers according to their
importance and may be de-assigned by the user.
For example if ground time overcurrent 1 has been enabled, then the following
assignments are made from the list of available operands.
Table 40: Ground time overcurrent 1 signal example
Available signals (operands)
GND TOC1 DPO
GND TOC1 OP
GND TOC1 PKP
Trigger
Range: Off, Trigger Only, Trigger/Re-Trigger, Re-Trigger Only
Default: Off
This setting selects the trigger function of the digital channel. When set to "Trigger Only"
or "Trigger/Re-Trigger", the transient recorder will initiate data capture for an OFF-ON
transition of the channel signal. The resulting record will contain both pre-fault and fault
data and the channel must return to the off state before it can generate a subsequent
trigger.
Operand assigned as a...
Digital channel
Yes
Yes
Yes
TRANSIENT RECORDER
Trigger
No
Yes
No
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