ABB REL 551 2.3 Series - Automatic Reclosing Function (AR)

77
Automatic reclosing function (AR) &KDSWHU
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The test can be divided into to parts; one to verify the internal logic and one to verify
the co-operation with the protection system. This section deals with the first test.
Prepare the terminal for verification of settings as outlined in section “Preparing for
test” in this chapter.
The test is performed together with protection and trip functions. Figure
18 "Simulating
breaker operation with two auxiliary relays." on page 78 illustrates a recommended test-
ing 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, re-
place 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 recharg-
ing time of 5-10 s after a closing operation. Then it is high. The example in figure
18
"Simulating breaker operation with two auxiliary relays." on page 78 shows that it is
simulated with SRY, a manual switch.