Differential Protection; Busbar Differential Protection; General; Operation Of The Differential Protection From Ctx Input - ABB RELION 670 Series Commissioning Manual

Section 10
Testing functionality by secondary injection
1. on the local HMI under Main menu/Events, or in more details via
2. the
The internal FIFO register of all events will appear when the event viewer is launched.
When the IED is brought into normal service it is recommended to delete all events resulting
from commissioning tests to avoid confusion in future fault analysis. All events in the IED can
be cleared in the local HMI under Main Menu//Clear/Clear internal event list or Main menu/
Clear/Clear process event list. It is not possible to clear the event lists from PCM600.
When testing binary inputs, the event list (EL) might be used instead. No uploading or
analyzing of registrations is then needed since the event list keeps running, independent of
start of disturbance registration.
10.2

Differential protection

10.2.1

Busbar differential protection

10.2.1.1

General

Secondary injection testing is a normal part of the commissioning. The operating value of all
protection functions, the output to the proper trip and alarm contacts and the operation of
binary input signals is checked and documented for future reference.
The connection of the test set to REB670 is greatly simplified if the RTXP 24 test switch is
included.When the test handle RTXH 24 is inserted in the test switch, preparations for testing
are automatically carried out in the proper sequence, that is, blocking of the tripping circuits,
short-circuiting of the current circuits on the transformer side, opening of current transformer
circuits and making IED terminals accessible from the terminals on the test plug handle.
If the REB670 is not provided with a test switch, the IED has to be tested in the proper way
from external circuit terminals. Make sure that the instrument transformers are isolated from
the circuits connected to the test set. The secondary phase terminals of the current
transformers must be short-circuited to neutral before the circuit is opened if any current can
flow on the primary side. The testing requires a good understanding of the protection
functionality of the REB670. A testing instruction is given for each type of protection function.
10.2.1.2

Operation of the differential protection from CTx input

Prepare the IED for verification of settings as outlined in the section
this chapter.
The typical connection between the three-phase current test set and REB670 IEDs is shown in
figure 13.
70
Event Viewer in PCM600.
Note that CT inputs for the REB670 are designed for a maximum continuous
current of four times rated value.
1MRK 505 339-UEN B
IP10805-1 v1
SEMOD127371-1 v2
SEMOD65859-3 v3
SEMOD65865-3 v4
"Preparing for test" in
Commissioning manual