Setting Guidelines - ABB RET670 Applications Manual

Section 3
IED application
3.8.5.2
538
Fuse failure supervision (SDDRFUF) function for voltage transformers. In many
application the voltages of two fuse groups of the same voltage transformer or fuse
groups of two separate voltage transformers measuring the same voltage can be
supervised with this function. It will be an alternative for example, generator units
where often two voltage transformers are supplied for measurement and excitation
equipment.
The application to supervise the voltage on two voltage transformers in the generator
circuit is shown in figure 220.
V1
Vd>
v2
Gen
en06000389_ansi.vsd
ANSI06000389 V1 EN
Figure 220: Supervision of fuses on generator circuit voltage transformers

Setting guidelines

The parameters for the voltage differential function are set via the local HMI or PCM600.
The following settings are done for the voltage differential function.
Operation: Off/On
VBase: Base voltage level in kV. The base voltage is used as reference for the voltage
setting factors. Normally, it is set to the system voltage level.
BlkDiffAtVLow: The setting is to block the function when the voltages in the phases are
low.
To Protection
To Excitation
1MRK504116-UUS C
Application manual