The same diagram is not always applicable to each specific delivery,
especially for the configuration of all the binary inputs and outputs.
Therefore, before testing, check that the available terminal diagram
corresponds to the protection relay.
The circuit diagrams of the application are recommended to be available. These are
required for checking the terminal block numbers of the current, trip, alarm and possibly
other auxiliary circuits.
The technical and application manuals contain application and functionality summaries,
function blocks, logic diagrams, input and output signals, setting parameters and technical
data sorted per function.
The minimum requirement for a secondary current injection test device is the ability to
work as a one phase current source.
The protection relay should be prepared for the test before testing a particular function.
The logic diagram of the tested protection function must be considered while performing
the test. All included functions in the protection relay are tested according to the
corresponding test instructions in this chapter. The functions can be tested in any order
according to user preferences. Therefore, the test instructions are presented in alphabetical
order. Only the functions that are in use (
Operation
is set to "On") should be tested.
The response from the test can be viewed in different ways.
•
Binary output signals
•
Monitored data values in the LHMI (logical signals)
•
A PC with a Web browser for WHMI use (logical signals and phasors)
All used setting groups should be tested.
Checking the external optical and electrical connections
The user must check the installation to verify that the protection relay is connected to the
other required parts of the protection system. The protection relay and all the connected
circuits are to be de-energized during the check-up.
Checking CT circuits
Check that the wiring is in strict accordance with the supplied connection
diagram.
The CTs must be connected in accordance with the terminal diagram provided with the
protection relay, both with regards to phases and polarity. The following tests are
recommended for every primary CT or CT core connected to the protection relay.
Section 4
1MAC059074-MB A
Protection functions
484
615 series ANSI
Technical Manual
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