ABB RELION 670 Series Applications Manual page 241

1MRK 505 337-UUS A
Section 11
11.1 Fuse failure supervision FUFSPVC
11.1.1 Identification
Function description
Fuse failure supervision
11.1.2 Application
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 grounded networks: a high value
of voltage 3V
related to a fuse failure event.
The zero sequence detection algorithm, based on the zero sequence measuring quantities is
recommended for use in directly or low impedance grounded networks: a high value of voltage 3V
without the presence of the residual current 3I
In cases where the line can have a weak-infeed of zero sequence current this function shall be
avoided.
Application manual
Secondary system supervision
IEC 61850
identification
FUFSPVC
without the presence of the negative-sequence current 3I
2
IEC 60617 ANSI/IEEE C37.2
identification device number
- -
is a condition that is related to a fuse failure event.
0
Section 11
Secondary system supervision
IP14556-1 v3
M14869-1 v4
SEMOD113803-4 v10
is a condition that is
2
0
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