Fuse Failure Supervision Fufspvc; Identification; Application - ABB Relion 670 Series Applications Manual

Section 12
Secondary system supervision
The minimum operate current,
the supervised CT circuits under normal service conditions and rated primary current.
The parameter
conditions.
The FAIL output is connected to the blocking input of the protection function to be blocked at
faulty CT secondary circuits.
12.2

Fuse failure supervision FUFSPVC

12.2.1

Identification

Function description
Fuse failure supervision
12.2.2

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
246
IMinOp , must be set as a minimum to twice the residual current in
Pickup_Block is normally set at 150% to block the function during transient
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
1MRK 511 358-UUS A
IP14556-1 v3
M14869-1 v4
SEMOD113803-4 v10
is a condition that is
2
Application manual
0