Stability Of The Busbar Differential Protection - ABB REB670 Commissioning Manual

Section 10
Testing functionality by secondary injection
10.3.1.3
86
17. Make sure the current from this current input is included into both measuring
zones ZA and ZB simultaneously.
Check the value for the configuration parameter ZoneSel of the CTx, and
• energize both the binary inputs CTRLZA and CTRLZB, if the value of
ZoneSel is CtrlIncludes,
• de-energize both the binary inputs CTRLZA and CTRLZB, If the value
of ZoneSel is CtrlExcludes,
• go directly to the next step, otherwise
18. Make sure that the dedicated binary output ACTIVE from the Zone
Interconnection block has the logical value one.
19. Repeat the steps from

Stability of the busbar differential protection

For stability test one current input shall always be used as a reference input. The
reference current input then shall be tested for stability against all other current
inputs in the IED. It is recommended to use current input CT1 as the reference
current input. The typical connection between the three-phase current test set and
the IED for this type of tests is shown in Figure 13.
REB 670 REB 670
CT1
CTx
IEC01000113 V2 EN-US
Figure 13: Typical test connection for CT1 and CTx current inputs of the
phase L1 when COMBITEST RTXP 24 test switch is delivered
together with the one-phase IED
The connections are shown for phase L1 only. Similar connection shall be used for
testing phase L2 and L3 also.
The test will be explained for CT1 and one general current input CTx (2 ≤ x ≤
Nmax, where Nmax is the maximum number of used CT inputs).
5 to 14 for both ZA and ZB.
REB 670
6A
6B
7A
7B
2A
2B
3A
3B
1MRK 505 372-UEN A
3-Ph current
Test Set
L1 L2 L3
I1 I2
6A
6B
7A
7B
6A
6B
7A
7B
2A
2B
3A
3B
2A
2B
3A
3B
IEC01000113-2-en.vsd
Busbar protection REB670 2.2 IEC
Commissioning manual
SEMOD65867-3 v5
N