ABB Relion 650 Series Technical Manual page 277

1MRK 506 326-UUS B
9.2.2 Functionality
The aim of the fuse failure supervision function (SDDRFUF) is to block voltage measuring
functions at failures in the secondary circuits between the voltage transformer and the IED in
order to avoid unwanted operations that otherwise might occur.
The fuse failure supervision function basically has three different algorithms, negative sequence
and zero sequence based algorithms and an additional delta voltage and delta current algorithm.
The negative sequence detection algorithm is recommended for IEDs used in isolated or high-
impedance grounded networks. It is based on the negative-sequence measuring quantities, a high
value of voltage without the presence of the negative-sequence current 3I
The zero sequence detection algorithm is recommended for IEDs used in directly or low
impedance grounded networks. It is based on the zero sequence measuring quantities, a high
value of voltage 3V
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.
For better adaptation to system requirements, an operation mode setting has been introduced
which makes it possible to select the operating conditions for negative sequence and zero
sequence based function. The selection of different operation modes makes it possible to choose
different interaction possibilities between the negative sequence and zero sequence based
algorithm.
9.2.3 Function block
I3P*
V3P*
BLOCK
52A
MCBOP
89B
ANSI08000220 V1 EN-US
Figure 139: SDDRFUF function block
9.2.4 Signals
Table 208: SDDRFUF Input signals
Name
I3P
V3P
BLOCK
Table continues on next page
Line distance protection REL650
Technical manual
without the presence of the residual current 3I
0
SDDRFUF
BLKZ
BLKV
3PH
DLD1PH
DLD3PH
ANSI08000220-1-en.vsd
Type Default
GROUP -
SIGNAL
GROUP -
SIGNAL
BOOLEAN 0
© Copyright 2011 ABB Power Grids. All rights reserved
Description
Three phase group signal for current inputs
Three phase group signal for voltage inputs
Block of function
Secondary system supervision
.
2
.
0
PID-1126-INPUTSIGNALS v5
Section 9
SEMOD113820-4 v5
M13678-3 v5
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