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Fuse failure supervision (FUSE) Chapter 10
Verifying settings by secondary
injection
8 Fuse failure supervision (FUSE)
Prepare the terminal for verification of settings as outlined in section “Preparing for
test” in this chapter.
The verification is divided in two main parts. The first part is common to all fuse failure
supervision options, and checks that binary inputs and outputs operate as expected ac-
cording to actual configuration. In the second part the relevant set operate values are
measured.
The corresponding binary signals that inform the operator about the operation of the
FUSE function are available on the local human-machine interface (HMI) unit under
the menu:
Service Report/Functions/FuseFailure/FuncOutputs
8.1 Checking that the binary inputs and outputs
operate as expected
Procedure
1. Simulate normal operating conditions with the three-phase
currents in phase with their corresponding phase voltages
and with all of them equal to their rated values.
2. Connect the nominal dc voltage to the FUSE-DISC binary in-
put.
• The signal FUSE-VTSU should appear with almost no time de-
lay.
• No signals FUSE-VTSZ and FUSE-VTF3PH should appear on
the terminal.
• Only the distance protection function operates.
• No other undervoltage-dependent functions must operate.
3. Disconnect the dc voltage from the FUSE-DISC binary input
terminal.
4. Connect the nominal dc voltage to the FUSE-MCB binary in-
put.
• The FUSE-VTSU and FUSE-VTSZ signals should appear with-
out any time delay.
• No undervoltage-dependent functions must operate.
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