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Preparing for test Chapter 10
Verifying settings by secondary
injection
2 Preparing for test
2.1 Overview
This section describes how to prepare the terminal in order to verify settings.
The preparation start with preparing the connection to the test switch if included. This
means connecting the test equipment according to a valid terminal diagram for the spe-
cific REx 5xx terminal. The terminal can then be set in test mode in order to facilitate
the test of individual functions and prevent unwanted operation from functions other
than the tested. The test switch should then be connected to the terminal. The user could
also verify the connection and that the analog inputs signals are measured correctly by
injecting a three-phase current and voltage. The tested function should then be released.
The disturbance report settings could be checked to ensure that correct indications are
given. The user could also identify the function to test in the technical reference manual
to retrieve signals and parameters names etc.
2.2 Preparing the connection to the test equipment
The REx 5xx terminal can be equipped with a test-switch of type RTXP 24. The test-
switch and its associated test plug handle (RTXH 24) are a part of the COMBITEST
system which gives a secure and convenient testing of the terminal.
The test-handle can be plugged into the test-switch or withdrawed from the test-switch
to the intermediate position. In this position, the trip circuits are blocked, the current cir-
cuits are short circuited. The voltage and current circuits are still connected to the relay.
The test-handle can be plugged into the test-switch or removed from the test-switch
completely by releasing the top and bottom latches on the handle.
When the test-handle is fully inserted into the test-switch, all current circuits on the
transformers side are short-circuited and all voltage circuits and trip circuits are opened,
except for terminal 1 and 12. They are used for dc supply of the REx 5xx terminal. The
test equipment connected to the test-handle is automatically connected to the terminal.
If a test switch is not used necessary actions need to be taken according to circuit dia-
gram.
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