Virtual Outputs; Direct Inputs And Outputs - GE L90 Instruction Manual

INPUTS/OUTPUTS

5.9.4 Virtual outputs

SETTINGS  INPUTS/OUTPUTS  VIRTUAL OUTPUTS  VIRTUAL OUTPUT 1(96)
 VIRTUAL OUTPUT 1

The virtual inputs and outputs are digital signals associated with UR-series internal logic signals. Virtual inputs include
signals generated by the local user interface. The virtual outputs are outputs of FlexLogic equations used to customize the
device. Virtual outputs can also serve as virtual inputs to FlexLogic equations.
There are 96 virtual outputs that can be assigned using FlexLogic. If not assigned, the output is forced to 'OFF' (Logic 0). An
ID also can be assigned to each virtual output. Virtual outputs are resolved in each pass through the evaluation of the
FlexLogic equations. Any change of state of a virtual output can be logged as an event if programmed to do so.
For example, if Virtual Output 1 is the trip signal from FlexLogic and the trip relay is used to signal events, the settings is
programmed as follows:
VIRTUAL OUTPUT 1 ID
VIRTUAL OUTPUT 1 EVENTS

5.9.5 Direct inputs and outputs

5.9.5.1 Overview
5
The relay provides eight direct inputs conveyed on communications channel 1 (numbered 1-1 through 1-8) and eight direct
inputs conveyed on communications channel 2 (on three-terminal systems only, numbered 2-1 through 2-8). The user
must program the remote relay connected to channels 1 and 2 of the local relay by assigning the desired FlexLogic
operand to be sent via the selected communications channel.
This relay allows the user to create distributed protection and control schemes via dedicated communications channels.
Some examples are directional comparison pilot schemes and transfer tripping. Note that failures of communications
channel affect direct input/output functionality. The 87L function must be enabled to utilize the direct inputs.
Direct input and output FlexLogic operands to be used at the local relay are assigned as follows:
• Direct input/output 1-1 through direct input/output 1-8 for communications channel 1
• Direct input/output 2-1 through direct input/output 2-8 for communications channel 2 (three-terminal systems only)
On the two-terminal, two channel system (redundant channel), direct outputs 1-1 to 1-8 are sent over both channels
simultaneously and are received separately as direct inputs 1-1 to 1-8 at channel 1 and direct inputs 2-1 to 2-8 at channel
2. Therefore, to take advantage of redundancy, the respective operands from channel 1 and 2 can be ORed with FlexLogic
or mapped separately.
5.9.5.2 Direct inputs
SETTINGS  INPUTS/OUTPUTS  DIRECT  DIRECT INPUTS
 DIRECT INPUTS

5-420
VIRTUAL OUTPUT 1 ID

Virt Op 1
VIRTUAL OUTPUT 1

EVENTS: Disabled
: "Trip"
: "Disabled"
DIRECT INPUT 1-1

DEFAULT: Off
DIRECT INPUT 1-8

DEFAULT: Off
DIRECT INPUT 2-1

DEFAULT: Off
DIRECT INPUT 2-8

DEFAULT: Off
Range: up to 20 alphanumeric characters
Range: Disabled, Enabled
Range: Off, On

Range: Off, On
Range: Off, On

Range: Off, On
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS