GE D90 Plus Instruction Manual page 274

CONTROL ELEMENTS
266
be de-asserted by the scheme based on the phase selection providing the peer device
with more information on the fault type. Otherwise, the peer device issues a three-pole
trip upon receiving the [0, 0, 0, 0] bit pattern.
RX1, RX2, RX3, RX4
Range: any FlexLogic™ operand
Default: OFF
These settings allow the user to select the FlexLogic™ operands that represent the
receive signals for the directional comparison blocking scheme. Typically input contacts
interfacing with a signaling system are used as follows.
– In single-bit applications,
– In two-bit applications,
– In four-bit applications,
Events
Range: Enabled, Disabled
Default: Enabled
This setting enables and disables the logging of directional comparison blocking scheme
events in the sequence of events recorder.
The directional comparison blocking scheme logic is shown below.
Figure 209: Directional comparison blocking scheme logic
must be used.
RX1
and must be used.
RX1 RX2
through must be used.
RX1 RX4
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION