Functionality - ABB 615 series Technical Manual

1MAC059074-MB A
6.5.3
6.5.4
615 series ANSI
Technical Manual

Functionality

The fuse failure supervision function 60 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 faulty operation of the voltage
protection functions.
60 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 "Enable" and "Disable".
The operation of 60 can be described with a module diagram. All the modules in the
diagram are explained in the next sections.
GUID-6891B535-AE42-4785-88B9-7A1C9122C9A9 V1 EN
Figure 448: Functional module diagram
Section 6
Supervision functions
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