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NVA100X-D - Manual - 02 - 2016
FUNCTION CHARACTERISTICS
Internal selective block (Block4)
As well as to send or transmit a selective block toward other protective relays, each protective
element may be enabled for receive or transmit a selective block from/to other internal protective
elements.
[1]
The internal selective block of one or more element concerning the residual overcurrent function
may be enabled/disabled by means the
IE1>BLK4
,
IE1>>BLK4
and/or
IE1>>>BLK4
param-
eters (virtual input and output common to all protective thresholds); the following operating modes
are available:
IN - the element is enabled to receive the selective block from an internal input.
OUT - the element is enabled to send the selective block to an internal output.
OFF - the element is disabled to send/receive the internal selective block.
Transmission and reception for the same element is not allowed, so any stall situation due to wrong
setting is avoided.
The internal selective block can work together with an external selective block from other protective
relays (Block2).
Nota 1 The exhaustive treatment of the internal selective block (Block 4) function may be found in the “Internal selective block” paragraph inside
CONTROL AND MONITORING
section.
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