Blocking signal can be tested also in the commissioning phase of the stage by software switch signal
when relay common and global testing mode is activated.
User settable variables are binary signals from the system. Blocking signal needs to reach the IED
minimum of 5 ms before the set operating delay has passedfor blocking to be active in time.
Operating time characteristics for trip and reset
This function supports de nite time delay (DT) and inverse de nite minimum time (IDMT) delay types.
For detailed information on these delay types refer to chapter General properties of a protection
function.
Events and registers
The NEF function generates events and registers from the status changes of start, trip and blocked. To
main event buffer is possible to select status “On” or “Off” messages. The NEF function offers four
independent instances which events are segregated for each instance operation.
12 last registers are available in the function where the triggering event of the function (start, trip or
blocked) is recorded with time stamp and process data values.
Table. 5.4.2. - 59. Event codes of the NEF-function instances.
Event Number
Event channel
Event block name
Event Code
Description
1664
26
NEF1
0
Start ON
1665
26
NEF1
1
Start OFF
1666
26
NEF1
2
Trip ON
1667
26
NEF1
3
Trip OFF
1668
26
NEF1
4
Block ON
1669
26
NEF1
5
Block OFF
1728
27
NEF2
0
Start ON
1729
27
NEF2
1
Start OFF
1730
27
NEF2
2
Trip ON
1731
27
NEF2
3
Trip OFF
1732
27
NEF2
4
Block ON
1733
27
NEF2
5
Block OFF
1792
28
NEF3
0
Start ON
1793
28
NEF3
1
Start OFF
1794
28
NEF3
2
Trip ON
1795
28
NEF3
3
Trip OFF
1796
28
NEF3
4
Block ON
1797
28
NEF3
5
Block OFF
1856
29
NEF4
0
Start ON
1857
29
NEF4
1
Start OFF
1858
29
NEF4
2
Trip ON
1859
29
NEF4
3
Trip OFF
1860
29
NEF4
4
Block ON
AQ-T257
Instruction manual
Version: 2.00
© Arcteq Relays Ltd
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