Fuse Failure Supervision Seqspvc; Identification; Function Block; Functionality - ABB Relion SMU615 Technical Manual

Section 5
Supervision functions
5.3
5.3.1
5.3.2
5.3.3
5.3.4
142

Fuse failure supervision SEQSPVC

Identification

Function description
Fuse failure supervision

Function block

GUID-1843AD62-0328-4BBF-B8D6-EF28945855D8 V1 EN
Figure 99: Function block

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 merging unit to avoid faulty
operation 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.

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.
IEC 61850 IEC 60617
identification identification
SEQSPVC FUSEF
1MRS758407 B
ANSI/IEEE C37.2
device number
60
SMU615
Technical Manual