2.12 Line differential protection
LdI> (87L)
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2.12.2. ANSI 85 (POC –signals)
Total of 16 signals can be sent between two VAMP59 line
differential relays via ANSI 85 communication. Basically it
means when relay is using 8 of the signals there is still 8 more
signals left for the other end. Signal status is updated every 10
ms.
List of POC –signals between the relays (ANSI 85):
User selectable name
for the signal (None as
a default)
None
DI1-n
VI1-4
VO1-6
Logic1-20
Figure 2.12.2-1 Selecting POC –signals
ANSI 85 communication has to be enabled between the relays
to transfer POC –signals. This is done by activating “Enable
instance 1”. When for example DI1 is selected as a signal it‟s
value remains 0 as long as DI1 is acticated. Activated signal in
index 1 activates the POC1 of the other relay in output matrix.
Signal is also visible in logic and other matrixes.
Communication status is “NoProtocol” when ANSI 85 is not
selected to remote port in protocol configuration –menu,
“Disable” when not activated and “OK” when instance 1 is
enabled.
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