•
One part to verify the internal logic and timing of the function
•
One part to verify its interaction with the protection system
This section deals with verification of SMBRREC itself. However, it is practical to start
SMBRREC by activating a protection function, for example, by secondary injection tests.
Prepare the IED for verification of settings as outlined in section
.
Values of the logical signals for SMBRREC are available on the local HMI under Main menu/
Tests/Function status/Control/SMBRREC(79,0->1)/SMBRREC:X. The Signal Monitoring in
PCM600 shows the same signals that are available on the local HMI.
The purpose of verification before commissioning is to check that entered selections, setting
parameters and configuration render the intended result. The function is flexible with many
options and facilities. At commissioning only the selections and settings intended for use are
verified. If one chooses to reduce some time settings in order to speed up verification, be
careful to set the parameters at intended operational values at the end of the verification
procedure. One such parameter is the
tReclaim time that must be timed out before a new test
sequence can be performed.
The verification test is performed together with protection and trip functions. Figure
illustrates a suggested testing arrangement, where the circuit-breaker (CB) is simulated by an
external bi-stable relay (BR), for example a relay type RXMVB2 or RXMD or Breaker Simulator of
ABB. The following manual switches are used:
•
Switch or push-button to close (SC)
•
Switch or push-button to trip (ST)
•
Switch for CB ready condition (SRY)
If no bi-stable relay or breaker simulator is available, replace it with two self-reset auxiliary
relays and use a self-holding connection.
Use a secondary injection IED test set to operate the protection function. The test set shall be
switched off when a trip signal is given or when the BR comes to open position to simulate real
conditions.
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 - 10s. After that it is high
again.
A CB condition CBREADY of a type, OCO shall be high (true) before and during tripping (Start
reclosing). During tripping it goes low for a recharging 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
1MRK 505 293-UEN B
Section 7
Testing functionality
Breaker protection REQ650
85
Commissioning manual
© Copyright 2013 ABB. All rights reserved
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