Main Logic - ABB REL650 Technical Manual

Section 10
Secondary system supervision
10.2.7.4
328
Dead Line Detection
IL1
IL2
IL3
IDLD<
UL1
UL2
UL3
UDLD<
intBlock
IEC10000035 V2 EN-US
Figure 164: Simplified logic diagram for Dead Line detection part

Main logic

A simplified diagram for the functionality is found in figure 165. The fuse failure
supervision function (FUFSPVC) can be switched on or off by the setting
parameter Operation to On or Off.
For increased flexibility and adaptation to system requirements an operation mode
selector, OpMode, has been introduced to make it possible to select different
operating modes for the negative and zero sequence based algorithms. The
different operation modes are:
• Off. The negative and zero sequence function is switched off.
• UNsINs. Negative sequence is selected.
• UZsIZs. Zero sequence is selected.
• UZsIZs OR UNsINs. Both negative and zero sequence are activated and work
in parallel (OR-condition for operation).
• UZsIZs AND UNsINs. Both negative and zero sequence are activated and work
in series (AND-condition for operation).
• OptimZsNs. Optimum of negative and zero sequence current (the function that
has the highest magnitude of measured negative and zero sequence current will
be activated).
The delta function can be activated by setting the parameter OpDUDI to On. When
selected it operates in parallel with the sequence based algorithms.
a
a<b
b
AND
a
a<b
b
a
a<b
b
AND
a
a<b
b
AND
a
a<b
b
AND
a
a<b
b
1MRK 506 382-UEN A
AllCurrLow
DeadLineDet1Ph
OR
AND
AND
AND
IEC10000035-1-en.vsd
GUID-D474A49E-D3A8-438C-B7E4-E527FEC2F335 v6
Line distance protection REL650 2.2 IEC
Technical manual
DLD1PH
DLD3PH