ABB RELION REX640 Technical Manual page 1331

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