Functionality - ABB Relion 650 Series Technical Manual

1MRK 511 424-UEN B
7.2.2
7.2.3
Bay control REC650 2.2 IEC
Technical manual

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.
Function block
FUFSPVC
I3P* BLKZ
U3P* BLKU
BLOCK 3PH
CBCLOSED DLD1PH
MCBOP DLD3PH
DISCPOS STDI
BLKTRIP STDIL1
STDIL2
STDIL3
STDU
STDUL1
STDUL2
STDUL3
IEC14000065-1-en.vsd
IEC14000065 V1 EN-US
Figure 47: FUFSPVC function block
Secondary system supervision
Section 7
SEMOD113820-4 v12
M13678-3 v9
115