ABB RELION REX640 - 6.5 Fuse failure supervision SEQSPVC (ANSI VCM, 60); 6.5.1 Identification; 6.5.2 Function block; 6.5.3 Functionality

Name Type Values (Range) Unit Description
WARN_CNT INT32 0...99999 Number of warnings
detected
SMPL_LATENCY FLOAT32 0.000...99.999 ms Measured sample laten-
cy
PROPAGTN_DLY FLOAT32 0.000...99.999 ms Measured propagation
delay
RND_TRIP_DLY FLOAT32 0.000...99.999 ms Measured round trip
delay
T_ALARM_CNT Timestamp Time when alarm count
was last changed
T_WARN_CNT Timestamp Time when warning
count was last changed
6.5 Fuse failure supervision SEQSPVC (ANSI VCM, 60)
6.5.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision SEQSPVC FUSEF VCM, 60
6.5.2 Function block
Figure 757: Function block
6.5.3 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.
1MRS759142 F
Supervision functions
REX640
Technical Manual
1331