GE D90 Plus Instruction Manual page 475

CHAPTER 10: DIGITAL FAULT RECORDER
Disturbance recorder digital channels
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Up to 32 digital channels may be assigned to the disturbance recorder. Each channel may
be individually configured by clicking the digital channels Select button in the disturbance
recorder window to open the disturbance recorder digital channels window.
Figure 392: Digital channel configuration settings
The following settings are available for each disturbance recorder digital channel.
Signals
Range: any FlexLogic™ operand or shared operand
Default: Off
This setting selects an operand to act as a trigger for the digital channel.
The pull-down list of available signals is populated according to the protection functions
that have been enabled. Selected signals will be automatically assigned as channels and
as triggers according to their importance. These signals may be deactivated by the user.
For example, if ground time overcurrent 1 has been enabled, then the following
assignments are made.
Table 42: Example disturbance recorder signal assignment
Available signals
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 disturbance 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.
DISTURBANCE RECORDER
Assignment
Digital channel
Yes
Yes
Yes
Trigger
No
Yes
No
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