13.2.2
Functionality
The aim of the fuse failure supervision function FUFSPVC is to block voltage
measuring functions at failures in the secondary circuits between the voltage
transformer and the IED in order to avoid inadvertent operations that otherwise might
occur.
The fuse failure supervision function basically has three different detection methods,
negative sequence and zero sequence based detection and an additional delta voltage
and delta current detection.
The negative sequence detection algorithm is recommended for IEDs used in isolated
or high-impedance earthed networks. It is based on the negative-sequence quantities.
The zero sequence detection is recommended for IEDs used in directly or low
impedance earthed networks. It is based on the zero sequence measuring quantities.
The selection of different operation modes is possible by a setting parameter in order
to take into account the particular earthing of the network.
A criterion based on delta current and delta voltage measurements can be added to the
fuse failure supervision function in order to detect a three phase fuse failure, which in
practice is more associated with voltage transformer switching during station
operations.
13.2.3
Function block
FUFSPVC
I3P*
U3P*
BLOCK
CBCLOSED
MCBOP
DISCPOS
BLKTRIP
BLKZ
BLKU
3PH
DLD1PH
DLD3PH
STDI
STDIL1
STDIL2
STDIL3
STDU
STDUL1
STDUL2
STDUL3
IEC14000065-1-en.vsd
IEC14000065 V1 EN
Figure 288:
FUFSPVC function block
1MRK502052-UEN B
Section 13
Secondary system supervision
607
Technical manual
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