Section 11 Secondary System Supervision; Fuse Failure Supervision Fufspvc; Identification; Application - ABB REB670 Applications Manual

1MRK 505 337-UUS -
Section 11
11.1
11.1.1
11.1.2
Application manual
Secondary system supervision

Fuse failure supervision FUFSPVC

Identification

Function description
Fuse failure supervision

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
Secondary system supervision
IEC 61850 IEC 60617
identification identification
FUFSPVC -
Section 11
ANSI/IEEE C37.2
device number
-
273