Inputs; Contact Inputs - GE 845 Instruction Manual

CHAPTER 4: SETPOINTS

Inputs

Level 1

Contact Inputs

845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 4-48: Inputs Display Hierarchy
Device
System
Inputs
Outputs
Protection
Monitoring
Control
FlexLogic
Level 2
The 845 relay is equipped with a number of Contact Inputs, depending on the Order Code,
which can be used to provide a variety of functions such as for circuit breaker control,
external trips, blocking of protection elements, etc. Contact inputs accept wet and dry
input signals. A wet type contact input signal requires an external DC voltage source. A dry
type contact input signal uses an internal DC voltage source. Depending on the DC source
level, the voltage threshold (17V, 33V, 84V, 166V) can be selected. The Contact Inputs are
located on the I/O card located in slots 'F' or 'G' or 'H'.
The Contact Inputs are either open or closed with a programmable debounce time to
prevent false operation from induced voltage. The debounce time is adjustable by the user
per manufacturer specifications.
Contact Inputs
Virtual Inputs Data Capture
Remote Inputs*
* Remote Inputs is only available when
IEC 61850 is selected in the order code
Level 3
INPUTS
Level 4
4–125