The CB simulation can be made more elaborate, including simulation of the operating gear
condition, CBREADY of either the type ready for a Close-Open (CO) cycle, or the type ready for
an Open-Close -Open (OCO) cycle.
The CB condition CBREADY of a type, CO, shall be high (true) until a closing operation is
performed. It then goes low (false) for a recharging time of about 5 -10 s. After that it is high
again.
A CB condition CBREADY of a type, OCO shall be high (true) before and during tripping (Start
start reclosing). During tripping it goes low for a recharging time, for example, 10 s. 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, Intelligent electronic device (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, e.g. 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 Synchrocheck SESRSYN condition.
7.7.3.1
Preparation of the verification
GUID-9FA37998-BF8A-4260-A56B-7D8720DDBDDB v2
1.
Check the function settings. In the HMI tree they are found under Main menu/
Settings/IED Settings/Control/STBRREC(79,0->1)/STBRREC:1
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 unit can be a reminder to restore normal
settings after which a verification test should be performed.
2.
Decide if a synchronization check (SYNC) shall be included in the test.
If SYNC as an internal function or external device is not operated by the injection, it may
be connected as a permanent high signal or controlled by a switch.
3.
Read and make notes of the reclosing operation counters. Local HMI tree Main menu/
Tests/Function status/Control/STBRREC(79,0->1)/STBRREC:1
Possibly reset the counters to zero. Counters are reset in the RESET menu. Make
arrangements for the simulation of the CB, for example, as in figure 13.
4.
Make arrangements for indication, recording and time measurements.
The signals for CBPOS, START, TR3P, CLOSECB, READY and other relevant signals should
preferably be arranged for event recording with time tagging. If that is not possible,
other means of time measurement and recording should be arranged.
7.7.3.2
Switching the auto-reclosing function
On and Off
GUID-58C294F4-003E-4855-A24B-9390B39D5908 v1
1.
Set the
Operation setting to Off and check the state.
2.
Set the
Operation setting to On and check the state, including SETON and READY.
Section 7
1MRK 505 293-UEN B
Testing functionality
90
Breaker protection REQ650
Commissioning manual
© Copyright 2013 ABB. All rights reserved
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