ABB REC 561 User Manual page 232

ABB Network Partner AB
Version 1.0-00
Fuse-failure supervision function
These steps are necessary for testing the FFS function:
1.1 Check if the input and output logical signals as shown in Fig. 1 are
configured to the corresponding binary inputs and outputs of the
tested terminal. If not, configure them for testing purposes. The
configuration of the FUSE-MCB and FUSE-DISC functional
inputs, respectively occur under the submenu:
Configuration
FunctionInputs
Fuse Failure
The FUSE-VTSU, FUSE-VTSZ and FUSE-VTF3PH output sig-
nals should be configured to the corresponding binary outputs
(relay contacts) under the submenu:
Configuration
Slotnn-ZZZy
Where nn is the corresponding number of the I/O module, and y is
the number of the output on the module. ZZZ indicates the type of
I/O modulethat is installed in the terminal.
1.2 Set off the operation of the FFS function under the submenu:
Settings
Functions
Group n
1.3 Connect the three-phase testing equipment to the tested terminal,
and simulate normal operating conditions with the three-phase cur-
rents in phase with their corresponding phase voltages and with all
of them equal to their rated values.
1.4 Disconnect one of the phase voltages and observe the operation of
the voltage-dependent built-in functions, such as distance protec-
tion and undervoltage protection. They must operate according to
the simulated system condition. Simulate normal operating condi-
tions again.
1.5 Connect the nominal dc voltage to the FUSE-DISC binary input,
and check that the signal FUSE-VTSU appears with almost no time
delay. Disconnect one of the phase voltages. No signals FUSE-
VTSZ and FUSE-VTF3PH should appear on the terminal. Only the
distance protection function operates. No other voltage-dependent
functions must operate. Simulate normal operating conditions again.
Disconnect the dc voltage from the FUSE-DISC binary input termi-
nal.
1.6 Connect the nominal dc voltage to the FUSE-MCB binary input
and check that the FUSE-VTSU and FUSE-VTSZ signals appear
without any time delay. Disconnect one of the phase voltages. No
1MRK 580 169-XEN
FuseFailure
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