Virtual Outputs; Analog Outputs - GE 845 Instruction Manual

OUTPUTS

Virtual Outputs

Analog Outputs

4–136
The 845 relay is equipped with 96 virtual outputs that may be assigned for use via
FlexLogic. Virtual outputs not assigned for use are set to OFF (Logic 0).
A name can be assigned to each virtual output. Any change of state to a virtual output can
be logged as an event if programmed to do so. Virtual outputs are resolved in each
protection pass via the evaluation of FlexLogic equations.
For example, if Virtual Output 1 is the trip signal from FlexLogic and the trip relay is used to
signal events, the settings would be programmed as follows:
Virtual Output 1 NAME: Trip
Virtual Output 1 Events: Enabled
Path:
Setpoints > Outputs > Virtual Outputs > Virtual Outputs 1 (32)
NAME
Range: up to 13 alphanumeric characters
Default: VO 1
An alphanumeric name may be assigned to a virtual output for diagnostic, setting, and
event recording purposes.
EVENTS
Range: Disabled, Enabled
Default: Disabled
Description
Depending on the order code, the 8 Series relay supports one optional DC analog card. The
Analog card has 4 analog inputs and 7 analog outputs. There are three Analog Output
channel scenarios for analog minimum and maximum output range: A, B, and C shown in
the figure below. Type A characteristics apply when the minimum range is 0 and the
maximum range is a positive (+ve) value. Type B characteristics apply when the minimum
and maximum ranges are definitely positive (+ve) values. Type C characteristics apply
when the minimum range is a negative (-ve) and the maximum range is a positive (+ve)
value. The following diagram illustrates these characteristics.
Figure 4-44: Analog Outputs Channel Characteristics
Path:
Setpoints > Outputs > Analog Outputs > Analog Output 1(X)
FUNCTION
Range: Disabled, Enabled
Default: Disabled
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS