Figure 376: Operation during test operation of the line differential protection
4.3.1.6 Commissioning
The commissioning of the line differential protection scheme would be difficult
without any support features in the functionality because of the relatively long
distance between the protection relays. This has been taken into consideration in
the design of the line differential protection. The communication channel can be
used for echoing the locally fed current phasors from the remote end. By using this
mode, it is possible to verify that differential calculation is done correctly in each
phase. Also, the protection communication operation is taken into account with the
differential current calculation when this test mode is used.
Required material for testing the protection relay
• Calculated settings
• Terminal diagram
• Circuit diagrams
• Technical and application manuals of the protection relay
• Single of three-phase secondary current source
• Single of three-phase primary current source
• Timer with start and stop interfaces
• Auxiliary voltage source for the protection relays
• PC with related software, a Web browser for WHMI
The setting and configuration of the protection relay must be completed before
testing.
The terminal diagram, available in the technical manual, is a general diagram of the
protection relay.
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.
1MRS759142 F Protection functions
REX640
Technical Manual
665
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