ABB Relion 670 Series RES670, Technical Manual

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IA
IB
IC
a
b
a<b
a
b
a<b
a
b
a<b
IDLDPU
VA
VB
VC
a
b
a<b
a
b
a<b
a
b
a<b
VDLDPU
OR
AND
AND
AND
AND
AND
AND
AND
AllCurrLow
DeadLineDet1Ph
DLD3PH
DLD1PH
intBlock
Dead Line Detection
ANSI0000035-1-en.vsd
ANSI0000035 V1 EN
Figure 130: Simplified logic diagram for Dead Line detection part
13.2.7.4 Main logic
A simplified diagram for the functionality is found in figure 131 . The fuse failure
supervision function (FUFSPVC) can be switched on or off by the setting parameter
Operation to Enabled or Disabled .
For increased flexibility and adaptation to system requirements an operation mode
selector,
OpModeSel , 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:
• Disabled . The negative and zero sequence function is disabled.
• V2I2 . Negative sequence is selected.
• V0I0 . Zero sequence is selected.
• V0I0 OR V2I2 . Both negative and zero sequence are activated and work in parallel in
an OR-condition.
• V0I0 AND V2I2 . 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).
Section 13
1MRK 511 365-UUS A
Secondary system supervision
372 Phasor measurement unit RES670 2.1 ANSI
Technical manual