Section 6 1MAC309294-MB F
Condition monitoring functions
376 RER620
Technical Manual
6.2 Fuse failure supervision 60
6.2.1 Identification
6.2.2 Function block
Figure 204: Function block
6.2.3 Functionality
The fuse failure supervision function SEQRFUF is used to block the voltage measuring
functions at a failure in the secondary circuits between the voltage transformer and relay
to avoid mis-operations of the voltage protection functions.
SEQRFUF has two algorithms, a negative sequence-based algorithm and a delta current
and delta voltage algorithm.
A criterion based on the delta current and the delta voltage measurements can be activated
to detect three-phase fuse failures which usually are more associated with the voltage
transformer switching during station operations.
6.2.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are Enable and Disable.
The operation of the fuse failure supervision function can be described by using a module
diagram. All the blocks in the diagram are explained in the next sections.
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision SEQRFUF FUSEF 60
To Next Page
Loading...
