• A bi-stable relay (BR) or two auxiliary relays to simulate a CB
• Two push-buttons (SC, ST) to operate the BR and a change-over switch (SRY) to
simulate CBREADY
• Possibly a switch simulation the synchronizing check SESRSYN condition
IED
CLOSE CB
Trip
CB POS
CB READY
BR
SC
ST
SRY
To test
set
+ -
IEC04000202-1-
en.vsd
IEC04000202 V2 EN
Figure 44: Simulating the CB operation by a bi-stable relay/breaker simulator
and manual switches
10.10.2.1 Preparation of the verification
1. Check the function settings on the local HMI under Main menu/Settings/
Setting group N/Control/Autorecloser79,5(0–>1)/SMBRREC:x
If any timer settings are reduced to speed up or facilitate the testing, they shall be
set to normal after testing. A temporary label on the IED can be a reminder to
restore normal settings after which a verification test should be performed.
2. Decide if a synchronizing check function SESRSYN shall be included in the
test.
If SESRSYN as an internal function or external device is not operated by the
injection, input signal SYNC must be connected as a permanent high signal or
controlled by a switch.
3. Read and make notes of the reclosing operation counters on the local HMI under
Main menu/Test/Function status/Control/AutoRecloser79,5(0–>1)/
SMBRREC:x
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 205
Commissioning manual
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