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Section 10
Testing functionality by secondary injection
1.
Connect the test set for injection of three-phase current (or if not available one-phase current)
to the current terminals of CTx input of REB670 terminal.
2.
Check and write down the value for the configuration parameter CTprimx, which corresponds to
the rated primary current of the CTx input.
Test the operation of the differential protection function ZA
3.
Make sure that the check zone is properly set and enabled, when used.
4.
Make sure the current from this current input is included into ZA measurement.
Check the value for the configuration parameter ZoneSel of the CTx, and
•
•
•
5.
Check the association status of each CT to the differential zones, from the local HMI (under
Main menu /Control/Station matrix ).
6.
Increase the current in the phase L1 until the correct differential zone function (that is, either ZA
or ZB) operates and observe the incoming and differential currents at the moment of operation.
7.
Check that the trip and alarm contacts operate according to the scheme wiring.
8.
Check that the trip information is stored in the event list (if connected).
9.
Switch off the current.
10.
Check that the trip reset information is stored in the event list (if connected).
11.
Check the function by injecting current in the phases L2 and L3 in the similar way.
12.
Inject a symmetrical three-phase current and observe the operate value (possible with three-
phase test set only).
13.
Connect the timer and set the current to be five times of the value for the parameter
DiffOperLevel.
14.
Switch on the current and observe the operate time.
Test the operation of the differential protection function ZB
15.
Test the operation of both differential protection function ZA and ZB simultaneously
Check the value for the configuration parameter ZoneSel of the CTx, and
•
•
•
16.
Repeat the steps from
Test the operation of both differential protection function ZA and ZB simultaneously
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
•
•
•
18.
Make sure that the dedicated binary output ACTIVE from the Zone Interconnection block has
the logical value one.
19.
Repeat the steps from
10.3.1.3
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.
74
energize the binary input CTRLZA, if the value of ZoneSel is CtrlIncludes, or
de-energize the binary input CTRLZA, if the value of ZoneSel is CtrlExcludes, or
go to the next step, if the value of ZoneSel is Fixed to ZA, Fixed to ZB or Fixed to ZA & -
ZB.
de-energize the binary input CTRLZA and energize the binary input CTRLZB, if the value
of ZoneSel is CtrlIncludes,
energize the binary input CTRLZA and de-energize binary input CTRLZB, if the value of
ZoneSel is CtrlExcludes
go directly to the next step, otherwise,
5
to
14
for ZB
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
5
to
14
for both ZA and ZB.
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 505 372-UEN Rev. K
SEMOD65867-3 v5
Busbar protection REB670
Commissioning manual
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