Due to the formulas for the axis compared, |SIphase | - |I ref | and |S I phase | + | I ref
| respectively, the slope can not be above 2.
13.1.7 Technical data
M12358-1 v9
Table 426: CCSSPVC(87) technical data
Function Range or value Accuracy
Trip current (10-200)% of IBase ±10.0% of I
n
at I ≤ I
n
±10.0% of I at I > I
n
Reset ratio, Trip current >90%
Block current (20-500)% of IBase ±5.0% of I
n
at I ≤ I
n
±5.0% of I at I > I
n
Reset ratio, Block current >90% at (50-500)% of IBase
13.2 Fuse failure supervision FUFSPVC
IP14556-1 v3
13.2.1 Identification
M14869-1 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fuse failure supervision FUFSPVC - -
13.2.2 Functionality
SEMOD113820-4 v11
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 grounded networks. It is based on the negative-sequence quantities.
The zero sequence detection is recommended for IEDs used in directly or low impedance
grounded 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 grounding of the network.
Section 13 1MRK 502 066-UUS B
Secondary system supervision
730
Technical manual
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