Section 9 Secondary system supervision
9.1 Fuse failure supervision FUFSPVC
IP14556-1 v3
9.1.1 Identification
M14869-1 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision FUFSPVC - -
9.1.2 Application
SEMOD113803-4 v10
Different protection functions within the protection IED, operates on the basis of
the measured voltage in the relay point. Examples are:
• impedance protection functions
• undervoltage function
• energizing check function and voltage check for the weak infeed logic
These functions can operate unintentionally if a fault occurs in the secondary
circuits between the voltage instrument transformers and the IED.
It is possible to use different measures to prevent such unwanted operations.
Miniature circuit breakers in the voltage measuring circuits should be located as
close as possible to the voltage instrument transformers, and shall be equipped with
auxiliary contacts that are wired to the IEDs. Separate fuse-failure monitoring IEDs
or elements within the protection and monitoring devices are another possibilities.
These solutions are combined to get the best possible effect in the fuse failure
supervision function (FUFSPVC).
FUFSPVC function built into the IED products can operate on the basis of external
binary signals from the miniature circuit breaker or from the line disconnector. The
first case influences the operation of all voltage-dependent functions while the
second one does not affect the impedance measuring functions.
The negative sequence detection algorithm, based on the negative-sequence
measuring quantities is recommended for use in isolated or high-impedance earthed
networks: a high value of voltage 3U
2
without the presence of the negative-
sequence current 3I
2
is a condition that is related to a fuse failure event.
1MRK 505 388-UEN B Section 9
Secondary system supervision
Busbar protection REB650 2.2 IEC 145
Application manual
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