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3
Autorecloser (AR)
Autorecloser (AR)
Prepare the terminal for verification of settings as outlined in
this chapter.
The test is performed together with protection and trip functions.
mended testing scenario, where the circuit breaker is simulated by an external bistable relay
(BR), for example an RXMVB2 or an RXMVD. The following switches are needed:
•
Switch close (SC)
•
Switch trip (ST)
•
Switch ready (SRY).
SC and ST can be push-buttons with spring return. If no bistable relay is available, replace it with
two self-reset auxiliary relays and use self-holding connection.
Use a secondary injection relay test set to operate the protection function. It is possible to use
the BR to control the injected analogue quantities so that the fault only appears when the BR is
picked up—simulating a closed breaker position.
To make the arrangement more elaborate, include the simulation of the operation gear condition,
AR01-CBREADY, for the sequences Close-Open (CO) and Open-Close-Open (OCO).
The AR01-CBREADY condition at the CO sequence type is usually low for a recharging time
of 5-10 s after a closing operation. Then it is high. The example in
ulated with SRY, a manual switch.
Chapter 13
Verifying settings by secondary
section 2 "Preparing for test"
Figure 18
illustrates a recom-
figure 18
shows that it is sim-
injection
in
89
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