Section 10 Secondary System Supervision; Fuse Failure Supervision Sddrfuf; Identification; Functionality - ABB REG650 Technical Manual

1MRK 502 034-UEN -
Section 10
10.1
10.1.1
10.1.2
Technical Manual
Secondary system supervision

Fuse failure supervision SDDRFUF

Identification

Function description
Fuse failure supervision

Functionality

The aim of the fuse failure supervision function (SDDRFUF) is to block voltage
measuring functions at failures in the secondary circuits between the voltage
transformer and the IED in order to avoid unwanted operations that otherwise
might occur.
The fuse failure supervision function basically has three different algorithms,
negative sequence and zero sequence based algorithms and an additional delta
voltage and delta current algorithm.
The negative sequence detection algorithm is recommended for IEDs used in
isolated or high-impedance earthed networks. It is based on the negative-sequence
measuring quantities, a high value of voltage 3U
negative-sequence current 3I
The zero sequence detection algorithm is recommended for IEDs used in directly
or low impedance earthed networks. It is based on the zero sequence measuring
quantities, a high value of voltage 3U
3I .
0
A criterion based on delta current and delta voltage measurements can be added to
the fuse failure supervision function in order to detect a three phase fuse failure,
which in practice is more associated with voltage transformer switching during
station operations.
For better adaptation to system requirements, an operation mode setting has been
introduced which makes it possible to select the operating conditions for negative
sequence and zero sequence based function. The selection of different operation
modes makes it possible to choose different interaction possibilities between the
negative sequence and zero sequence based algorithm.
Secondary system supervision
IEC 61850 IEC 60617
identification identification
SDDRFUF -
without the presence of the
2
.
2
without the presence of the residual current
0
Section 10
ANSI/IEEE C37.2
device number
-
267