A CB condition CBREADY of a type, OCO shall be high (true) before and during
tripping (start auto reclosing). During tripping it goes low for a rechar
ging time, for
example, 10s. It may thus be low at the instant of reclosing. After each Open or
Close operation it may need a recharging period before it goes high again.
In the example of CB simulation arrangement, the CBREADY condition is
simulated by a manual switch, SRY.
Information and material for the verification:
• Protection or control unit, IED, configured and with settings entered.
• Configuration diagram for the IED
• Terminal diagram for the IED, or plant circuit diagram including the IED
• Technical reference manual for the IED
• IED test set for secondary injection
• Means to indicate, measure and record operation and times, for example an
event recording facility
• 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
CLOSECB
Trip
CBCLOSED
CBREADY
BR
SC
ST
SRY
To test
set
+ -
IEC04000202-3-en.vsd
IEC04000202 V3 EN-US
Figure 53: Simulating the CB operation by a bi-stable relay/breaker simulator
and manual switches
1MRK 505 378-UEN A Section 11
Testing functionality by secondary injection
Line differential protection RED670 2.2 IEC 231
Commissioning manual
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