ABB RED615 Technical Manual page 374

Section 4
Protection functions
368
and outputs. Therefore, before testing, check that the available
terminal diagram corresponds to the IED.
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 IED 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 IED 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 IED is connected to the other
required parts of the protection system. The IED 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 IED, both with regards to phases and polarity. The following tests are
recommended for every primary CT or CT core connected to the IED.
• Primary injection test to verify the current ratio of the CT, the correct wiring
up to the protection IED and correct phase sequence connection (that is L1,
L2, L3.)
• Polarity check to prove that the predicted direction of the secondary current
flow is correct for a given direction of the primary current flow. This is an
1YHT530004D05 D
615 series
Technical Manual