ABB REC 561, User Manual

Page: 231 / 643

ABB Network Partner AB
Fuse-failure supervision function
Version 1.0-00
1MRK 580 169-XEN
Page 5 - 52
Pay special attention to the dissymmetry of the measuring quantities when
the function is used on longer untransposed lines, on multicircuit lines,
and so on.
3.2 Testing
It is possible to disable the function during the test mode under the follow-
ing conditions:
• When the function should be blocked under the testing conditions.
The selection of functions, which should be blocked is possible
under the menu:
Test
BlockFunctions
• The terminal has been set into the test mode by setting the Opera-
tion=On. This selection takes place under the menu:
Test
TestMode
Operation
• The terminal has been set automatically into test mode by applying
the logical 1 to the TEST-INPUT functional input
Important note: The function will be blocked if the corresponding set-
ting under the BlockFunctions menu remains on and the TEST-INPUT
signal remains active.
Check the operation of the FFS function during the commissioning and
during regular maintenance tests. ABB Network Partner recommends,
although it does not absolutely request, the use of a testing equipment of
type RTS 21 (FREJA) for purposes of the secondary injection testing.
The test equipment used should be able to provide an independent three-
phase supply of voltages and currents to the tested terminal. It must be
possible to separately change the values of voltages, currents, and phase
angles among them independent of each other, for each phase. The test
voltages and currents should have a common source, with very small con-
tent of higher harmonics. If the test equipment cannot indicate the phase
angles between the measured quantities, a separate phase angle meter is
needed.
The corresponding binary signals that inform the operator about the oper-
ation of the FFS function are available on the local man-machine interface
(MMI) unit under the menu:
Service Report
Logical Signals
FuseFailure
The appendix describes the corresponding signals that display informa-
tion on the operation of the FFS function.