Remote Inputs - GE 845 Instruction Manual

INPUTS

Remote Inputs

Analog Inputs
NOTE:
NOTE:
4–122
Remote inputs provide a means of exchanging digital state information between Ethernet-
networked devices supporting IEC 61850. Remote inputs that create FlexLogic operands at
the receiving relay are extracted from GOOSE messages originating in remote devices.
Remote input 1 must be programmed to replicate the logic state of a specific signal from a
specific remote device for local use. The programming is performed by the three settings
shown in the Virtual Inputs section.
The REMOTE INPUT 1 Name setting allows the user to assign descriptive text to the remote
input.
The REMOTE INPUT 1 Events setting helps in enabling whether an event has to be
generated whenever Remote input status is updated.
The 8 Series relay can monitor any external quantity from the DcmA transducers such as
vibration, field current, pressure, tap position etc., using 'Analog Inputs'. Any one of the
standard transducer output ranges: 0 to 1 mA, 0 to 5 mA, 0 to 10mA, 0 to 20 mA, or 4 to 20
mA can be connected to the Analog Input terminals. Polarity of these inputs must be
observed for proper operation. The analog input circuitry is isolated as a group with the
analog output circuitry and the RTD circuitry, only one ground reference is used for the
three circuits. Transducers limit this isolation to ±36 V with respect to the 8 Series safety
ground.
Depending upon the order code, the 8 Series relay supports one optional DC analog card.
The analog card has 4 analog inputs and 7 analog outputs. For each element, when the
measured analog input quantity exceeds the Pickup level for longer than the associated
time delay, the relay can be configured to cause an alarm, or trip. The element will drop
out only when the user programmed Dropout ratio has been met.
The connected analog input is still read and displayed in METERING /ANALOG INPUTS if the
trip function or alarm function is set to "Disabled", and the Analog Input is not Disabled.
Path:
Setpoints > Inputs > Analog Inputs > Analog In 1(X) Setup
Settings
FUNCTION
Range: Disabled, Enabled
Default: Disabled
This setting disables the Analog Input function or enables it for any generic application
or any specific application i.e., Tap Position. Upon selecting a specific application its
value is also displayed in the Transformer metering menu.
In the Tap Changer Setup, DcmA input is selected as 'Tap Detection Input' and Analog Input
1 Function is set as 'Tap Position'. All other settings for Analog Input 1 are hidden.
NAME
Range: Any combination of 13 Characters
Default: Anlp 1
This setting allows the user to give a symbolic name to each analog input. The length is
limited to 13 characters.
UNITS
Range: Any combination of 6 Characters
Default: units
This setting allows the user to give a symbolic name to the engineering units. The length
is limited to 6 characters.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS