Completing The Test; Fuse Failure Supervision Sddrfuf; Checking That The Binary Inputs And Outputs Operate As Expected - ABB RET670 Installation And Commissioning Manual

1MRK 504 088-UEN C
13.10.1.2
13.10.2
13.10.2.1
Installation and commissioning manual
1. Check the input circuits and the operate value of the IMinOp current level
detector by injecting current, one phase at a time.
2. Check the phase current blocking function for all three phases by injection
current, one phase at a time. The output signals shall reset with a delay of 1
second when the current exceeds 1.5 · IBase.
3. Inject a current 0.9 · IBase to phase L1 and a current 0.15 · IBase to the
reference current input I5.
4. Decrease slowly the current to the reference current input and check that
blocking is obtained when the current is about 0.1 · IBase.

Completing the test

Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.

Fuse failure supervision SDDRFUF

Prepare the IED for verification of settings as outlined in section
section "Preparing for test"
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 according to actual configuration. In the second part the relevant set
operate values are measured.

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 DISCPO binary input.
• The signal BLKU should appear with almost no time delay.
• No signals BLKZ and 3PH should appear on the IED.
• Only the distance protection function operates.
• No other undervoltage-dependent functions must operate.
3. Disconnect the dc voltage from the DISCPOS binary input terminal.
4. Connect the nominal dc voltage to the MCBOP binary input.
• The BLKU and BLKZ signals should appear without any time delay.
• No undervoltage-dependent functions must operate.
5. Disconnect the dc voltage from the MCBOP binary input terminal.
Verifying settings by secondary injection
in this chapter.
Section 13
"Overview" and
171