ABB Relion 670 Series Applications Manual page 266

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Section 13
Secondary system supervision
Pickup_Block : It is normally set at 150% to block the function during transient conditions.
The FAIL output is connected to the blocking input of the protection function to be blocked at
faulty CT secondary circuits.
13.2
Fuse failure supervision FUFSPVC
13.2.1
Identification
Function description
Fuse failure supervision
13.2.2
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.
260
IEC 61850
identification
FUFSPVC
without the presence of the negative-sequence current 3I
2
© Copyright 2017 ABB. All rights reserved
IEC 60617
ANSI/IEEE C37.2
identification
device number
-
-
is a condition that is related to a fuse failure event.
0
1MRK 511 401-UUS F
IP14556-1 v3
M14869-1 v4
SEMOD113803-4 v10
is a condition that is
2
Bay control REC670
Application manual
0

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