ABB Relion REG670, Technical Manual

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IL1
IL2
IL3
a
b
a<b
a
b
a<b
a
b
a<b
IDLD<
UL1
UL2
UL3
a
b
a<b
a
b
a<b
a
b
a<b
UDLD<
OR
AND
AND
AND
AND
AND
AND
AND
AllCurrLow
DeadLineDet1Ph
DLD3PH
DLD1PH
intBlock
Dead Line Detection
IEC10000035-1-en.vsd
IEC10000035 V2 EN
Figure 292: Simplified logic diagram for Dead Line detection part
13.2.7.4 Main logic
A simplified diagram for the functionality is found in figure 293 . 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.
Section 13
1MRK502052-UEN B
Secondary system supervision
616
Technical manual