Release By 31805_External Release Bb Zone - ABB RELION REB500 Operation Manual

Section 7
Additional functions
• Releasing BBP_L1L2L3, BBP_L0, External TRIP BB Zone (CU) and External TRIP BB Zone
(BU) always involves enabling intertripping of the respective protection zone.
• Releasing OCDT and PDF always involves enabling the respective function and only applies
if the feeder is connected to the respective protection zone. This is determined by the
intertripping logic.
• Releasing BFP and EFP in columns 1 to 4 involves enabling intertripping of these functions
(for example, BFP trip after t2).
IEC18000472 V1 EN-US
Figure 28: Settings/Voltage external release
Table 36: Release criteria
Release criterion
U only
External release input only
U AND external release input
U OR external release input
Release corresponding BU
function
7.2.3

Release by 31805_External release BB zone

There is a 31805_External release BB zone signal for every protection zone configured on the
central unit (for example, enable trip-ping of BB zone 1 or enable tripping BB zone 2).
60
Description
Can only be selected if the voltage release function has been configured.
Can only be selected if input 31805_External release BB-zone has been
configured.
AND logic of the voltage release criterion and the input 31805_External
release BB-zone. This can only be selected if the voltage release criterion and
the input 31805_External release BB-zone have been configured.
OR logic of the voltage release criterion and the input 31805_External release
BB-zone. This can only be selected if the voltage release criterion and the
input 31805_External release BB-zone have been configured.
Can only be selected if a corresponding criterion in the other four columns
has been configured.
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