6.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Fuse failure supervision SEQSPVC FUSEF 60
6.2.2 Function block
Figure 270: Function block
6.2.3 Functionality
The fuse failure supervision function SEQSPVC is used to block the voltage-
measuring functions when failure occurs in the secondary circuits between the
voltage transformer (or combi sensor or voltage sensor) and protection relay to
avoid misoperations of the voltage protection functions.
SEQSPVC 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 "On" and "Off".
The operation of SEQSPVC can be described with a module diagram. All the
modules in the diagram are explained in the next sections.
1MRS758755 C
Supervision functions
REC615 & RER615
Technical Manual
535
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